US5619508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual port interface for a computer-based multifunction personal communication system
Assignee: Multi Tech Systems Inc
•
Filing: 1995-03-23
•
Granted: 1997-04-08
•
Expires: 2015-03-23
Abstract
Abstract A personal communications system enables the operator to simultaneously transmit voice and data communication to a remote site. The personal communications system is equipped with two telephone line interfaces to allow connection between two remote sites. The connection between the first remote site and the local site may operate in a voice over data communications mode to simultaneously send compressed voice and data. The connection between the local site and a second site is a voice only connection allowing the first remote site to talk to the second remote site without breaking the data communication connection between the first site and the local site. The second remote site amy be a public telephone network. The communication between the first remote site and the second remote site through the local site may also be a data communication connection, or it may also be a voice over data communication connection.
Inventors
- 👤 Jeffrey P. Davis
- 👤 Raghu Sharma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:57
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/64; H04L12/6418; H04L27/00; H04L27/32; H04L27/34; H04L27/3405; H04L27/3416; H04L65/00; H04L65/1066; H04L65/1069; H04L65/60; H04L65/70; H04L65/80; H04L9/00; H04L9/40; H04M; H04M1/00; H04M1/247; H04M1/2473; H04M1/2477; H04M1/253; H04M1/60; H04M1/6033; H04M11/00; H04M11/06; H04M11/064; H04M11/068; H04M3/00; H04M3/42; H04M3/50; H04M3/53; H04M3/5307; H04M3/533; H04M3/56; H04M3/567; H04M7/00; H04M7/0024; H04M7/0033; H04M7/12; H04M7/1205; H04M7/128; H04M7/1295; H04N; H04N1/00; H04N1/00127; H04N1/00204; H04N1/00206; G; G10; G10L; G10L19/00; G10L19/04; H04L2012/6424; H04L2012/6427; H04L2012/6445; H04L2012/6459; H04L2012/6475; H04L2012/6481; H04L2012/6491; H04L2012/6494; H04L65/1101; H04M1/64; H04M1/65; H04M1/6505; H04M2203/00; H04M2203/45; H04M2203/4509; H04M2250/00; H04M2250/62; H04M3/002; H04M7/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
252 words
A communication apparatus, comprising: data interface connected a personal computer; first telephone line interface means for connection to a first telephone line; second telephone line interface means for connection to a second telephone line; telephone device means for receiving local voice signals from a local user and for conveying remote voice signals from a remote user to the local user; full-duplex conversion means connected to the telephone device means for converting the local voice signals into outgoing digital voice data and for converting incoming digital voice data into the remote voice signals; voice compression means connected to the full-duplex conversion means for compressing the outgoing digital voice data into compressed outgoing digital voice data and for decompressing compressed incoming digital voice data into the incoming digital voice data; main control means connected to the voice compression means, the data interface, the first telephone line interface means and the second telephone line interface means, for receiving the compressed outgoing digital voice data from the voice compression means, receiving outgoing computer digital data from the personal computer through the data interface, multiplexing and transmitting compressed outgoing digital voice data with the outgoing computer digital data to the first telephone line interface means for transmission on the first telephone line, receiving and demultiplexing compressed incoming digital voice data and incoming computer digital data from the first telephone line interface means from the first telephone line, and passing the remote voice signals to the second telephone line interface means for transmission on the second telephone line.
Claim 2
Dependent Claim
252 words
A communication apparatus, comprising: data interface connected a personal computer; first telephone line interface means for connection to a first telephone line; second telephone line interface means for connection to a second telephone line; telephone device means for receiving local voice signals from a local user and for conveying remote voice signals from a remote user to the local user; full-duplex conversion means connected to the telephone device means for converting the local voice signals into outgoing digital voice data and for converting incoming digital voice data into the remote voice signals; voice compression means connected to the full-duplex conversion means for compressing the outgoing digital voice data into compressed outgoing digital voice data and for decompressing compressed incoming digital voice data into the incoming digital voice data; main control means connected to the voice compression means, the data interface, the first telephone line interface means and the second telephone line interface means, for receiving the compressed outgoing digital voice data from the voice compression means, receiving outgoing computer digital data from the personal computer through the data interface, multiplexing and transmitting compressed outgoing digital voice data with the outgoing computer digital data to the first telephone line interface means for transmission on the first telephone line, receiving and demultiplexing compressed incoming digital voice data and incoming computer digital data from the first telephone line interface means from the first telephone line, and passing the remote voice signals to the second telephone line interface means for transmission on the second telephone line.
Claim 3
Dependent Claim
94 words
The apparatus according to claim 1 wherein the main control means is further operable for detecting silent periods in the outgoing digital voice data and for producing in response thereto a silence flag and wherein the main control means is further operable for transmitting outgoing conventional digital data when the silence flag indicates the absence of voice information and wherein the main control means is further operable for multiplexing and transmitting both the compressed outgoing digital voice data and the outgoing computer digital data when the silence flag indicates the presence of voice information.
Claim 4
Dependent Claim
87 words
The apparatus according to claim 1 wherein the first telephone line includes a cellular telephone link and wherein the main control means is further operable for periodically transmitting a cellular supervisory packet on the first telephone line and for maintaining the cellular telephone link over the telephone line if the receipt of the cellular supervisory packet is acknowledged within a predetermined period of time and for dropping the link over the telephone line if the cellular supervisory packet is not acknowledged within a predetermined period of time.
Claim 5
Dependent Claim
234 words
The apparatus according to claim 1 wherein the voice compression means is further operable for compressing the outgoing digital voice data into compressed outgoing digital voice data by performing the steps of: a.) removing any DC bias in the outgoing digital voice signal to produce a pre-emphasized outgoing digital voice signal; b.) pre-emphasizing the normalized outgoing digital voice signal to produce a pre-emphasized outgoing digital voice signal; c.) dividing the pre-emphasized outgoing digital voice signal into segments to produce a current speech segment and a past speech segment; d.) predicting the pitch of the current speech segment to form a pitch prediction; e.) calculating the gain of the pitch of the current speech segment to form a prediction gain; f.) reconstructing the past speech segment from a compressed past segment to produce a reconstructed past segment; g.) finding the innovation in the current speech segment by comparing the pitch prediction to the reconstructed past segment to produce an error signal; h.) determining the maximum amplitude in the current speech segment; i.) quantizing the error signal using a code book generated from a representative set of speakers and environments to produce a minimum mean squared error matching the form of an index into the code book; and j.) recording the pitch prediction, the prediction gain, the maximum amplitude and the index into the code book in a packet as the compressed outgoing digital voice data.
Claim 6
Dependent Claim
41 words
The apparatus according to claim 1 wherein the main control means is further operable for passing the outgoing computer digital data along with the remote voice signals to the second telephone line interface means for transmission on the second telephone line.
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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) | 2000-04-07 | 2000-10-07 | 2001-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-07 | 2004-10-07 | 2005-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-07 | 2008-10-07 | 2009-04-08 | $7700.00 | Window Closed / Lapsed |