Patent US4833222A successfully refreshed from Google Patents.
US4205201A
Expired / Lapsed
US
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Method and means for reducing intelligible crosstalk in telephone systems
Assignee: Individual
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Filing: 1978-10-10
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Granted: 1980-05-27
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Expires: 1998-10-10
Abstract
Abstract A system and method for improving the spectrum utilization of voice communications channels by increasing the number of voice conversations a given number of lines can service. This invention can be used to improve the reliability and efficiency of conventional TASI (Time Assignment Speech Interpolation) systems and allow such systems to provide good performance when utilizing a mixture of types of telephone lines; including, microwave, cable, satellite, and two wire configuration lines.
Inventors
- 👤 Leonard R. Kahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:16
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/17; H04J3/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
The method of improving the line utilization efficiency of a multichannel telephone system comprising: (a) sensing speech activity of a channel, (b) selecting a line from an inactive group of lines to transmit the speech sensed in Step (a), and subsequently connecting the channel's speech wave to the selected line, (c) rapidly transmitting the initial channel identification information over substantially the entire bandwidth of the selected line to the remote end of the line, and (d) transmitting continuous channel verification information in a narrowband slot in the passband of the line concurrently with the transmission of the speech.
Claim 2
Independent Claim
98 words
The method of improving the line utilization efficiency of a multichannel telephone system comprising: (a) sensing speech activity of a channel, (b) selecting a line from an inactive group of lines to transmit the speech sensed in Step (a), and subsequently connecting the channel's speech wave to the selected line, (c) rapidly transmitting the initial channel identification information over substantially the entire bandwidth of the selected line to the remote end of the line, and (d) transmitting continuous channel verification information in a narrowband slot in the passband of the line concurrently with the transmission of the speech.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the bandwidth of the narrowband slot of Step (d) is approximately 300 Hertz.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the narrowband slot of Step (d) covers a frequency range of approximately 2,000 Hz to 2,300 Hz.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the initial identification information is transmitted in a time interval of approximately 10 ms.
Claim 6
Dependent Claim
102 words
A TASI type system, comprising; (a) means for sensing the presence of a speech wave in a given channel, (b) means for selecting an inactive line to transmit the detected wave, (c) means for generating a high speed channel identification wave representing the active channel, (d) means for connecting the high speed channel identification signal to the selected line, (e) means for generating a narrowband channel identification wave channel, and, (f) means for connecting the narrowband channel identification wave to the selected line after the high speed channel identification signal has completed transmission and concurrently with the transmission of the speech wave.
Claim 7
Dependent Claim
102 words
A TASI type system, comprising; (a) means for sensing the presence of a speech wave in a given channel, (b) means for selecting an inactive line to transmit the detected wave, (c) means for generating a high speed channel identification wave representing the active channel, (d) means for connecting the high speed channel identification signal to the selected line, (e) means for generating a narrowband channel identification wave channel, and, (f) means for connecting the narrowband channel identification wave to the selected line after the high speed channel identification signal has completed transmission and concurrently with the transmission of the speech wave.
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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) | 1983-05-27 | 1983-11-26 | 1984-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-27 | 1987-11-26 | 1988-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-27 | 1991-11-26 | 1992-05-27 | $7700.00 | Window Closed / Lapsed |