US5164980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video telephone system
Assignee: Alkanox Corp
•
Filing: 1990-02-21
•
Granted: 1992-11-17
•
Expires: 2010-02-21
Abstract
Abstract Apparatus and method are provided for the simultaneous transmission of video information and audio information in substantially real time over an ordinary voice grade telephone line having limited bandwidth in the range of about 300-3400 Hz. Because of the limited bandwidth of the ordinary telephone line, the video and audio information are compressed before transmission thereof. Each of the video information and audio information is separately compressed, mixed together and then further compressed. After the further compression, a composite signal, which includes the mixture of video and audio information, is asynchronously transmitted over the same bandwidth of the ordinary telephone line. Upon reception, the compressed information is expanded and separate video information and audio information are reproduced for viewing and hearing by the receiving party. To reduce the size of the apparatus, application specific integrated circuits (ASICs) are employed. A state machine controller apparatus is integrated with the ASIC technology to control the transfer and storing of video information and audio information and also to control the operation of the various compression and expansion stages associated with the transmitting and receiving channels.
Inventors
- 👤 Daniel R. Bush
- 👤 Ashok Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:38
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/236; H04N21/2368; G; G10; G10L; G10L19/00; H04N19/00; H04N19/60; H04N19/61; H04N19/619; H04N21/40; H04N21/43; H04N21/434; H04N21/4341; H04N7/00; H04N7/14; H04N7/141; H04N7/148; G10L19/04
Claims Analysis
Total Claims: 53
Claim 1
Independent Claim
149 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing including controlling the sending of said audio information from seventh memory means to means for transforming said audio information to a frequency domain from a time domain; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 2
Independent Claim
149 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing including controlling the sending of said audio information from seventh memory means to means for transforming said audio information to a frequency domain from a time domain; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 3
Dependent Claim
27 words
A method, as claimed in claim 1, wherein: said step of transmitting includes using the same bandwidth to send both said video information and said audio information.
Claim 4
Dependent Claim
38 words
A method, as claimed in claim 1, wherein: said step of generating a video signal includes focusing automatically a camera device to provide focused video images of an object represented by reflected light inputted to said camera device.
Claim 5
Dependent Claim
42 words
A method, as claimed in claim 1, wherein: said step of producing includes controlling the sending of said video information from first memory means using second state machine controller means in order to compress said video information using a spatial compression mode.
Claim 6
Dependent Claim
43 words
A method, as claimed in claim 1, wherein: said step of producing includes controlling the sending of said video information from second memory means using third state machine controller means to transform said video information to a frequency domain from a time domain.
Claim 7
Dependent Claim
41 words
A method, as claimed in claim 1, wherein: said step of producing includes controlling the sending of said video information from fourth memory means using fifth state machine controller means in order to compress said video information using coefficient selector means.
Claim 8
Dependent Claim
50 words
A method, as claimed in claim 1, wherein: said step of producing includes controlling the sending of said video information from fifth memory means using fifth state machine controller means in order to compress said video information using means for reducing the number of bits associated with said video information.
Claim 9
Dependent Claim
63 words
A method, as claimed in claim 1, wherein said step of generating said audio signal includes: converting an analog audio signal to a digital audio signal; storing digital audio information representative of said digital audio signal in seventh memory means; wherein sixth state machine controller means controls the conversion of said analog signal to said digital signal and monitors said seventh memory means.
Claim 10
Independent Claim
157 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line in substantially real time, comprising: generating a video signal having video information, said step of generating a video signal includes providing first means having a number of pixels with said number of pixels together comprising a frame and wherein said video signal is generated using a number of frames with an updating of frames being provided at a rate of about 7.5 frames per second; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 11
Independent Claim
157 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line in substantially real time, comprising: generating a video signal having video information, said step of generating a video signal includes providing first means having a number of pixels with said number of pixels together comprising a frame and wherein said video signal is generated using a number of frames with an updating of frames being provided at a rate of about 7.5 frames per second; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 12
Independent Claim
141 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes compressing said video information by a factor of at least 57 times and separately compressing said audio information; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 13
Independent Claim
141 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes compressing said video information by a factor of at least 57 times and separately compressing said audio information; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 14
Independent Claim
138 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes compressing video information and audio information of said composite video/audio signal, said step of producing including using fast Fourier transform means for receiving both video information and audio information; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 15
Independent Claim
138 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes compressing video information and audio information of said composite video/audio signal, said step of producing including using fast Fourier transform means for receiving both video information and audio information; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 16
Independent Claim
138 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes using one of said video information and said audio information as real numbers and using the other one of said video information and said audio information as imaginary numbers; modulating said composite signal; transmitting said modulating composite signal using an ordinary telephone line having a limited bandwidth; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 17
Independent Claim
138 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes using one of said video information and said audio information as real numbers and using the other one of said video information and said audio information as imaginary numbers; modulating said composite signal; transmitting said modulating composite signal using an ordinary telephone line having a limited bandwidth; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 18
Independent Claim
167 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes controlling the sending of said video information from sixth memory means to fast Fourier operator means using ninth state machine controller means in order to provide said fast Fourier operator means with one of real numbers and imaginary numbers using said inputted video information; modulating said composite signals; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 19
Independent Claim
167 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes controlling the sending of said video information from sixth memory means to fast Fourier operator means using ninth state machine controller means in order to provide said fast Fourier operator means with one of real numbers and imaginary numbers using said inputted video information; modulating said composite signals; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 20
Dependent Claim
59 words
A method, as claimed in claim 13, wherein: said step of producing includes controlling the sending of said audio information from tenth memory means to said fast Fourier operator means using said ninth state machine controller means, with said audio information being inputted to said fast Fourier operator means as the other one of said real and imaginary numbers.
Claim 21
Independent Claim
150 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes controlling the sending of said audio information from ninth memory means to means for selecting coefficients associated with said audio information using eighth state machine controller means; modulating said composite signal; transmitting said modulating composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 22
Independent Claim
150 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes controlling the sending of said audio information from ninth memory means to means for selecting coefficients associated with said audio information using eighth state machine controller means; modulating said composite signal; transmitting said modulating composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 23
Independent Claim
140 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes obtaining a reduced number of coefficients associated with said audio information using eighth state machine controller means; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 24
Independent Claim
140 words
A method for transmitting and receiving video and audio signals over an ordinary telephone line having a bandwidth of about 300-3400 Hz in substantially real time, comprising: generating a video signal having video information; generating an audio signal having audio information; producing a composite video/audio signal wherein said composite signal includes a mixture of compressed video information and compressed audio information, said step of producing includes obtaining a reduced number of coefficients associated with said audio information using eighth state machine controller means; modulating said composite signal; transmitting said modulated composite signal using an ordinary telephone line having a limited bandwidth in the range of about 300-3400 Hz; receiving said modulated composite signal after having been sent over the ordinary telephone line; demodulating said modulated composite signal; and reproducing said video information and said audio information using said composite signal.
Claim 25
Independent Claim
155 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line having a limited bandwidth of between about 300-3400 Hz, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line having a limited bandwidth in the range of about 300-3400 Hz; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for expanding compressed video information by combining previously transmitted video information with currently transmitted video information and means for expanding said audio information by combining previously transmitted audio information and currently transmitted audio information; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 26
Independent Claim
155 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line having a limited bandwidth of between about 300-3400 Hz, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line having a limited bandwidth in the range of about 300-3400 Hz; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for expanding compressed video information by combining previously transmitted video information with currently transmitted video information and means for expanding said audio information by combining previously transmitted audio information and currently transmitted audio information; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 27
Dependent Claim
54 words
An apparatus, as claimed in claim 17, wherein said second means includes: transducer means for outputting an analog audio signal; amplifier means for amplifying said analog audio signal; and low pass filter means responsive to said amplifier means for substantially preventing the passage of signals having a frequency greater than a predetermined cut-off frequency.
Claim 28
Dependent Claim
23 words
An apparatus, as claimed in claim 17, wherein said third means includes: means for compressing said video information using square root determining means.
Claim 29
Dependent Claim
26 words
An apparatus, as claimed in claim 17, wherein said third means includes: means for determining a difference between previously transmitted video information and current video information.
Claim 30
Dependent Claim
25 words
An apparatus, as claimed in claim 17, wherein said fourth means includes: means for expanding compressed video information and compressed audio information using multiplying means.
Claim 31
Dependent Claim
26 words
An apparatus, as claimed in claim 17, wherein said fourth means includes: means for expanding compressed video information and compressed audio information using coefficients restorer means.
Claim 32
Dependent Claim
30 words
An apparatus, as claimed in claim 17, wherein said fourth means includes: image magnifying means for receiving compressed video information and magnifying said video information to a larger frame size.
Claim 33
Dependent Claim
32 words
An apparatus, as claimed in claim 17, wherein said first means includes: means for automatically focusing a lens of a camera device for generating an analog video signal having said video information.
Claim 34
Independent Claim
231 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line, said third means includes means for providing a composite signal having said video information and said audio information mixed together; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for decoding said mixed video/audio information to provide expanded mixed video/audio information, said fourth means including means for separating video information and audio information from said mixed video/audio information, said means for separating including inverse fast Fourier transform means, first memory means for storing said separated video information, second memory means for storing said separated audio information and state machine controller means communicating with said inverse fast Fourier transform means, said first memory means and said second memory means for controlling said fast Fourier transform means and the transfer of said separated video information and said separated audio information to said first memory means and said second memory means, respectively; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 35
Independent Claim
231 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line, said third means includes means for providing a composite signal having said video information and said audio information mixed together; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for decoding said mixed video/audio information to provide expanded mixed video/audio information, said fourth means including means for separating video information and audio information from said mixed video/audio information, said means for separating including inverse fast Fourier transform means, first memory means for storing said separated video information, second memory means for storing said separated audio information and state machine controller means communicating with said inverse fast Fourier transform means, said first memory means and said second memory means for controlling said fast Fourier transform means and the transfer of said separated video information and said separated audio information to said first memory means and said second memory means, respectively; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 36
Independent Claim
193 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line, said third means including means for mixing said compressed video information and said compressed audio information to provide a single data stream wherein both of said video information and said audio information is adapted to be transmitted using the same bandwidth over the ordinary voice grade telephone line, said means for mixing including: fast Fourier operating means; memory means; and state machine controller means communicating with said fast Fourier operator means and said memory means for controlling the operation of said fast Fourier operating means and controlling the transfer of mixed video/audio data to said data means; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 37
Independent Claim
193 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line, said third means including means for mixing said compressed video information and said compressed audio information to provide a single data stream wherein both of said video information and said audio information is adapted to be transmitted using the same bandwidth over the ordinary voice grade telephone line, said means for mixing including: fast Fourier operating means; memory means; and state machine controller means communicating with said fast Fourier operator means and said memory means for controlling the operation of said fast Fourier operating means and controlling the transfer of mixed video/audio data to said data means; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 38
Dependent Claim
35 words
An apparatus, as claimed in claim 26, wherein said third means further includes: means for determining whether currently transmitted video information corresponds to previously transmitted video information in order to further compress said video information.
Claim 39
Dependent Claim
61 words
An apparatus, as claimed in claim 27, wherein said means for determining includes: means for taking the difference between previous and current video information; encoder means for analyzing said difference; and state machine controller means communicating with said means for taking the difference and said encoder means for controlling each of said means for taking the difference and said encoder means.
Claim 40
Independent Claim
139 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line, said third means including means for providing a composite signal having said video information and said audio information mixed together, said third means further including modulator means for modulating a carrier wave having one of two predetermined frequencies using said mixed video/audio information; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 41
Independent Claim
139 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line, said third means including means for providing a composite signal having said video information and said audio information mixed together, said third means further including modulator means for modulating a carrier wave having one of two predetermined frequencies using said mixed video/audio information; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 42
Independent Claim
119 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for converting video information from a time domain to a frequency domain using an inverse cosine transformation means; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 43
Independent Claim
119 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for converting video information from a time domain to a frequency domain using an inverse cosine transformation means; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 44
Independent Claim
113 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for converting audio information to a time domain from a frequency domain; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 45
Independent Claim
113 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof, said fourth means including means for converting audio information to a time domain from a frequency domain; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 46
Dependent Claim
65 words
An apparatus, as claimed in claim 31, wherein said means for converting includes: inverse cosine transformation means for transforming said audio information to said time domain; memory means communicating with said inverse cosine transformation means for receiving audio information in said time domain; and state machine controller means for controlling said inverse cosine transformation means and transfer of said audio information to said memory means.
Claim 47
Dependent Claim
30 words
An apparatus, as claimed in claim 32, wherein: said inverse cosine transformation means includes multiplier and accumulator means for receiving compressed audio information to be converted to said time domain.
Claim 48
Independent Claim
131 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information, one of said first means and said second means including means for determining the bandwidth of the ordinary voice grade telephone line over which said video information and said audio information are to be transmitted; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 49
Independent Claim
131 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information, one of said first means and said second means including means for determining the bandwidth of the ordinary voice grade telephone line over which said video information and said audio information are to be transmitted; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; and sixth means for generating sounds using said audio information.
Claim 50
Independent Claim
126 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; sixth means for generating sounds using said audio information; and means for providing said video information with a security code wherein only designated receivers of said video information are adapted to obtain said video information for proper decoding after transmission.
Claim 51
Independent Claim
126 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; sixth means for generating sounds using said audio information; and means for providing said video information with a security code wherein only designated receivers of said video information are adapted to obtain said video information for proper decoding after transmission.
Claim 52
Independent Claim
123 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; sixth means for generating sounds using said audio information; and means for storing compressed video information that is adapted to be or has been transmitted over the ordinary voice grade telephone line for later expansion and display.
Claim 53
Independent Claim
123 words
An apparatus for simultaneously transmitting and receiving video and audio signals over an ordinary voice grade telephone line, comprising: first means for generating video information; second means for generating audio information; third means for producing compressed video information and compressed audio information for transmission, in substantially real time, over an ordinary voice grade telephone line; fourth means for reproducing video information and audio information from said compressed video information and said compressed audio information after transmission thereof; fifth means for displaying images using said video information; sixth means for generating sounds using said audio information; and means for storing compressed video information that is adapted to be or has been transmitted over the ordinary voice grade telephone line for later expansion and display.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |