US4479213A
Expired / Lapsed
US
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Transmission method for transmitting voice and data information over telephone line and device for implementing said method
Assignee: International Business Machines Corp
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Filing: 1982-07-19
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Granted: 1984-10-23
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Expires: 2002-07-19
Abstract
Abstract The method allows voice and data information to be concentrated over a reduced number of telephone lines. It consists mainly in processing each voice signal to extract therefrom a so-called analog base band signal and digitally coded characteristic parameters. Said parameters are then multiplexed with pure data and submitted to a modulation operation. The analog signal resulting from the modulation is then added to the base band before being transmitted over a telephone line.
Inventors
- 👤 Claude Galand
- 👤 Henri Nussbaumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:07
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04M11/062; H04B; H04B1/00; H04B1/66; H04B1/667
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
A transmission method for simultaneously transmitting voice signals covering a given frequency bandwidth and pure data provided by digital terminals over the same telephone line, said method including: processing the voice signals for extracting a low frequency band analog signal, i.e., a base band signal and characteristic voice parameters therefrom; digitally coding said characteristic voice parameters; multiplexing said pure data with said digitally coded characteristic parameters; converting the multiplexed data into analog signal(s); adding said analog converted signal(s) to said analog base band; and transmitting said added signal(s) over the telephone line(s).
Claim 2
Dependent Claim
92 words
A transmission method for simultaneously transmitting voice signals covering a given frequency bandwidth and pure data provided by digital terminals over the same telephone line, said method including: processing the voice signals for extracting a low frequency band analog signal, i.e., a base band signal and characteristic voice parameters therefrom; digitally coding said characteristic voice parameters; multiplexing said pure data with said digitally coded characteristic parameters; converting the multiplexed data into analog signal(s); adding said analog converted signal(s) to said analog base band; and transmitting said added signal(s) over the telephone line(s).
Claim 3
Dependent Claim
64 words
A transmission method according to claim 1, wherein said extraction of so-called characteristic speech parameters is performed according to the so-called base band vocoder techniques and includes: filtering the speech signal into several subbands whose juxtaposition covers the high-frequency bandwidth of the speech signal; and, measuring energy information from the signal contained in each of said subbands to derive said characteristic speech parameters therefrom.
Claim 4
Dependent Claim
20 words
A transmission method according to claim 2, wherein said energy measurement is performed on speech signal segments of predetermined duration.
Claim 5
Dependent Claim
26 words
A transmission method according to claim 3, wherein said energy contained in each subband is normalized with respect to the energy contained in the base band.
Claim 6
Dependent Claim
84 words
A transmission method according to claim 1, wherein said extraction of the characteristic speech parameters is performed according to the so-called predictive vocoder techniques including: measuring an information ENERG relative to the energy of the high-frequency bandwidth of the speech signal; digitally coding said information ENERG; extracting from said speech signal an information COEF representing digitally coded partial correlation coefficients; and, multiplexing said digitally coded ENERG and COEF into a single bit train, wherein said bit train is representative of said characteristic speech parameters.
Claim 7
Dependent Claim
27 words
A transmission method according to any one of claims 1 to 5, wherein said conversion of the multiplexed data into an analog signal is performed by modulation.
Claim 8
Dependent Claim
136 words
A transmission method wherein information provided by N voice sources are concentrated over n telephone lines with n less than N, said method including the operations of: filtering the speech signals provided by said voice sources for individually extracting so-called low frequency analog base band signals therefrom; extracting from each of said speech signals so-called characteristic speech parameters and digitally coding said parameters; grouping the various base band signals into predetermined groups; adding together the base band signals within each of said groups and transmitting the added base band signals over a first same telephone line; grouping the characteristic speech parameters into predetermined groups; multiplexing together the parameters of the same group; submitting the multiplexed parameters of each group to modulation operation; and, transmitting the signal resulting from said modulation over a second same telephone line.
Claim 9
Dependent Claim
136 words
A transmission method wherein information provided by N voice sources are concentrated over n telephone lines with n less than N, said method including the operations of: filtering the speech signals provided by said voice sources for individually extracting so-called low frequency analog base band signals therefrom; extracting from each of said speech signals so-called characteristic speech parameters and digitally coding said parameters; grouping the various base band signals into predetermined groups; adding together the base band signals within each of said groups and transmitting the added base band signals over a first same telephone line; grouping the characteristic speech parameters into predetermined groups; multiplexing together the parameters of the same group; submitting the multiplexed parameters of each group to modulation operation; and, transmitting the signal resulting from said modulation over a second same telephone line.
Claim 10
Dependent Claim
57 words
A method according to claim 7, wherein said extraction of the characteristic speech parameters is performed according to the so-called base band vocoder techniques and includes: filtering the speech signal into several subbands whose juxtaposition covers the speech high-frequency bandwidth; and, measuring the energy contained in each of said subbands to derive the characteristic speech parameters therefrom.
Claim 11
Dependent Claim
19 words
A method according to claim 8, wherein said energy measurement is performed over speech signal segements of predetermined duration.
Claim 12
Dependent Claim
31 words
A method according to claim 9, wherein the energy of the signal contained in each of the subbands is normalized with respect to the energy contained in the corresponding base band.
Claim 13
Dependent Claim
74 words
A method according to claim 7, wherein said characteristic speech parameters extraction is performed according to the so-called predictive vocoder techniques including: extracting from each speech signal an information ENERG relative to the energy of the high-frequency bandwidth of said speech signal; digitally coding said information ENERG; extracting from each speech signal an information COEF representing digitally coded partial correlation coefficients; and, multiplexing said digitally coded ENERG and COEF into a single bit train.
Claim 14
Independent Claim
45 words
A method according to any one of claims 7 to 11, wherein said base band signal grouping includes: submitting at least one of said base band signals to a single side band modulation operation; and, adding together the base bands belonging to a same group.
Claim 15
Independent Claim
160 words
A device for transmitting voice signals and pure data provided by digital terminals over the same telephone line, including: filtering means fed with said voice signals and deriving therefrom a so-called base band analog information and high-frequency sub-bands information; energy measuring means responsive to said filtering means for deriving energy information relative to the energies contained within said base band and within each of said subbands; energy normalizing means responsive to said energy measuring means for normalizing said subband energies to the base band energy; coding means responsive to said normalizing means for digitally coding said normalized energies and deriving characteristic speech parameters therefrom; multiplexing means connected to said coding means and to at least one source of pure data; modulating means connected to said multiplexing means, and, adding means responsive to said filtering means and to said modulating means for adding said base band information to the signal supplied by said modulating means, and for feeding said telephone line.
Claim 16
Independent Claim
160 words
A device for transmitting voice signals and pure data provided by digital terminals over the same telephone line, including: filtering means fed with said voice signals and deriving therefrom a so-called base band analog information and high-frequency sub-bands information; energy measuring means responsive to said filtering means for deriving energy information relative to the energies contained within said base band and within each of said subbands; energy normalizing means responsive to said energy measuring means for normalizing said subband energies to the base band energy; coding means responsive to said normalizing means for digitally coding said normalized energies and deriving characteristic speech parameters therefrom; multiplexing means connected to said coding means and to at least one source of pure data; modulating means connected to said multiplexing means, and, adding means responsive to said filtering means and to said modulating means for adding said base band information to the signal supplied by said modulating means, and for feeding said telephone line.
References Cited (Backward Citations)
US3991277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |