US5585850A
Expired / Lapsed
US
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Adaptive distribution system for transmitting wideband video data over narrowband multichannel wireless communication system
Assignee: Harris Corp
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Filing: 1994-10-31
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Granted: 1996-12-17
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Expires: 2014-10-31
Abstract
Abstract A technique for transmitting wideband signals such as video signals over a communication system such as a cellular or Personal Communication System (PCS) which only has narrowband channels. The video signal is first digitized and compressed, and then forwarded to a commutating switch, together with any other narrowband signals which are to be transmitted using the same system. The commutating switch demultiplexes the video signal into multiple digital channel signals. The number of digital channel signals dedicated to carrying the video signals may vary as a system controller determines the availability of channel space in the system. The output channels from the switch are then each modulated as required by the particular wireless communication system in use, and forwarded to a digital combiner to produce a wideband composite signal. At a receiving site, the process is reversed, and a digital filter bank, or channelizer, separates the digital channel signals and forwards them to a set of digital demodulators. The demodulated signals are then fed to a multiplexing switch, which, under command from a controller which receives instructions from a system channel assignment controller, directs the channel signals containing the video information to a first-in first-out buffer memory. The reconstructed digital video signal is then decompressed and converted back to analog form for display.
Inventors
- 👤 John Schwaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:20
CPC Classifications
H; H04; H04J; H04J4/00; H04L; H04L25/00; H04L25/02; H04L25/14; H04L27/00; H04L27/26; H04L27/2601; H04L27/2626; H04L27/2627; H04L27/264; H04L27/26412; H04L5/00; H04L5/003; H04L5/0044
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
181 words
A transmitting station capable of transmitting a video signal over a plurality of narrowband wireless communication channels, the transmitting station comprising: a. means for sampling the video signal; b. buffer means, connected to the means for sampling the video signal, for accumulating the samples of the video signal; c. means for identifying a plurality of available narrowband radio channels to which the samples of the video signal are to be assigned; d. means, connected to the identifying means, for selecting a portion of the video samples from the buffer means, the number of selected samples being of a size such that they can be transmitted over one or more of the identified narrowband channels; e. switching means, connected between the buffer means and the identified narrowband channels and responsive to the selecting means, for providing the selected portion of the video samples to the identified channels; f. combiner means, connected to the identified narrowband channels, for combining signals from multiple channels into a single, wideband composite signal; and g. transmission means, connected to the combiner means, for transmitting the wideband signal.
Claim 2
Dependent Claim
181 words
A transmitting station capable of transmitting a video signal over a plurality of narrowband wireless communication channels, the transmitting station comprising: a. means for sampling the video signal; b. buffer means, connected to the means for sampling the video signal, for accumulating the samples of the video signal; c. means for identifying a plurality of available narrowband radio channels to which the samples of the video signal are to be assigned; d. means, connected to the identifying means, for selecting a portion of the video samples from the buffer means, the number of selected samples being of a size such that they can be transmitted over one or more of the identified narrowband channels; e. switching means, connected between the buffer means and the identified narrowband channels and responsive to the selecting means, for providing the selected portion of the video samples to the identified channels; f. combiner means, connected to the identified narrowband channels, for combining signals from multiple channels into a single, wideband composite signal; and g. transmission means, connected to the combiner means, for transmitting the wideband signal.
Claim 3
Dependent Claim
17 words
The transmitting station of claim 1 additionally comprising: means for assigning non-video information to the combiner means.
Claim 4
Dependent Claim
36 words
The transmitting station of claim 1 wherein the transmission means comprises: a. means for converting a digital signal from the combiner means to an analog signal; and b. a wideband transmitter connected to the converting means.
Claim 5
Dependent Claim
17 words
The transmitting station of claim 1 wherein the selecting means formats the extracted video information into packets.
Claim 6
Dependent Claim
26 words
The transmitting station of claim 1 wherein the switching means is capable of selecting a plurality of portions of the video samples from the buffer means.
Claim 7
Dependent Claim
21 words
The transmitting station of claim 1 further comprising compression means, for compressing the video signal prior to sampling the video signal.
Claim 8
Dependent Claim
23 words
The transmitting station of claim 1 wherein the combiner means comprises: a. an inverse Fourier transform-based unit; and b. a deconvolutional digital filter.
Claim 9
Dependent Claim
23 words
The transmitting station of claim 1 wherein the buffer means for accumulating the samples of the video signal is a first-in first-out memory.
Claim 10
Dependent Claim
16 words
The transmitting station of claim 1, wherein the buffer means is a first-in first-out memory buffer.
Claim 11
Dependent Claim
206 words
A transmitting station capable of transmitting a video signal over a plurality of narrowband wireless communication channels, the transmitting station comprising: a. means for sampling the video signal; b. buffer means, connected to the means for sampling the video signal, for accumulating the samples of the video signal; c. means for identifying a plurality of available narrowband radio channels to which the samples of the video signal are to be assigned, wherein the identification means identifies channel space and time slots based on at least one of current channel utilization, expected channel utilization, and tariff structure; d. means, connected to the identifying means, for selecting a portion of the video samples from the buffer means, the number of selected samples being of a size such that they can be transmitted over one or more of the identified narrowband channels; e. switching means, connected between the buffer means and the identified narrowband channels and responsive to the selecting means, for providing the selected portion of the video samples to the identified channel; f. combiner means, connected to the identified narrowband channels, for combining signals from multiple channels into a single, wideband composite signal; and g. transmission means, connected to the combiner means, for transmitting the wideband signal.
Claim 12
Dependent Claim
206 words
A transmitting station capable of transmitting a video signal over a plurality of narrowband wireless communication channels, the transmitting station comprising: a. means for sampling the video signal; b. buffer means, connected to the means for sampling the video signal, for accumulating the samples of the video signal; c. means for identifying a plurality of available narrowband radio channels to which the samples of the video signal are to be assigned, wherein the identification means identifies channel space and time slots based on at least one of current channel utilization, expected channel utilization, and tariff structure; d. means, connected to the identifying means, for selecting a portion of the video samples from the buffer means, the number of selected samples being of a size such that they can be transmitted over one or more of the identified narrowband channels; e. switching means, connected between the buffer means and the identified narrowband channels and responsive to the selecting means, for providing the selected portion of the video samples to the identified channel; f. combiner means, connected to the identified narrowband channels, for combining signals from multiple channels into a single, wideband composite signal; and g. transmission means, connected to the combiner means, for transmitting the wideband signal.
Claim 13
Dependent Claim
141 words
A receiving station for receiving a wideband radio frequency signal comprising multiple narrowband channelized signals representing a video signal, the receiving station comprising: a. digital tuner means for receiving the wideband signal; b. channelizer means for converting the wideband signal into a plurality of signal outputs, each channel signal having a predetermined channel bandwidth less than the bandwidth of the video signal; wherein the channelizer means comprises: (i) a convolutional digital filter connected to receive the wideband signal, and which provides a digital filter output; and (ii) a last Fourier transform processor, connected to receive the digital filter output and to provide the plurality of channel signal outputs each having a predetermined channel bandwidth; c. demodulator means, for demodulating the plurality of changed signals; and d. digital to analog conversion means, for converting the sampled video signal to an analog signal.
Claim 14
Dependent Claim
141 words
A receiving station for receiving a wideband radio frequency signal comprising multiple narrowband channelized signals representing a video signal, the receiving station comprising: a. digital tuner means for receiving the wideband signal; b. channelizer means for converting the wideband signal into a plurality of signal outputs, each channel signal having a predetermined channel bandwidth less than the bandwidth of the video signal; wherein the channelizer means comprises: (i) a convolutional digital filter connected to receive the wideband signal, and which provides a digital filter output; and (ii) a last Fourier transform processor, connected to receive the digital filter output and to provide the plurality of channel signal outputs each having a predetermined channel bandwidth; c. demodulator means, for demodulating the plurality of changed signals; and d. digital to analog conversion means, for converting the sampled video signal to an analog signal.
Claim 15
Independent Claim
124 words
A method of transmitting a video signal over a multichannel wireless communication system, on which the bandwidth of each wireless channel is smaller than the bandwidth of the video signal, the method comprising the steps of: a. sampling the video signals to provide a sampled video signal; b. determining the identity of a number of wireless channels which are available for transmission; c. demultiplexing the sampled video signal into a number of demultiplexed signals equal to the number of available wireless channels; d. modulating the demultiplexed signals in accordance with an air interface standard in use by the multichannel wireless system, to provide a plurality of modulated signals; e. combining the modulated signals to provide a composite signal; and f. transmitting the composite signal.
Claim 16
Independent Claim
124 words
A method of transmitting a video signal over a multichannel wireless communication system, on which the bandwidth of each wireless channel is smaller than the bandwidth of the video signal, the method comprising the steps of: a. sampling the video signals to provide a sampled video signal; b. determining the identity of a number of wireless channels which are available for transmission; c. demultiplexing the sampled video signal into a number of demultiplexed signals equal to the number of available wireless channels; d. modulating the demultiplexed signals in accordance with an air interface standard in use by the multichannel wireless system, to provide a plurality of modulated signals; e. combining the modulated signals to provide a composite signal; and f. transmitting the composite signal.
References Cited (Backward Citations)
US4608711A
Cited
JPS62185A
Cited
US4747160A
Cited
US4918524A
Cited
JPH031690A
Cited
JPH03105383A
Cited
WO1991017622A1
Cited
US5268897A
Cited
JPH04183085A
Cited
US5276525A
Cited
GB2256771A
Cited
US5381459A
Cited
US5349631A
Cited
US5282222A
Cited
US5410737A
Cited
US5325419A
Cited
US5412429A
Cited
WO1994024773A1
Cited
US5428668A
Cited
US5426460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-17 | 2000-06-17 | 2000-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-17 | 2004-06-17 | 2004-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-17 | 2008-06-17 | 2008-12-17 | $7700.00 | Window Closed / Lapsed |