US4648089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital voice summing for teleconferencing
Assignee: Verizon Laboratories Inc
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Filing: 1984-10-29
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Granted: 1987-03-03
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Expires: 2004-10-29
Abstract
Abstract Digitally encoded voice signals are weighted dynamically in multipliers prior to summation of the digital signals. Greater weight is given to the more active channels. In one system, the signals are weighted proportionately to the square of the amplitude of each digital voice signal.
Inventors
- 👤 To R. Hsing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:08
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56; H04M3/561; H04M3/568
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
Electronic signal processing apparatus for combining digital voice signals in teleconferencing comprising: multiplier generator means for generating a multiplier for each of the digital voice signals as a function of the comparative levels of the signals; digital multiplier means for multiplying each digital voice digital with its respective multiplier; and digital summing means for summing the outputs of the multiplier means.
Claim 2
Dependent Claim
61 words
Electronic signal processing apparatus for combining digital voice signals in teleconferencing comprising: multiplier generator means for generating a multiplier for each of the digital voice signals as a function of the comparative levels of the signals; digital multiplier means for multiplying each digital voice digital with its respective multiplier; and digital summing means for summing the outputs of the multiplier means.
Claim 3
Dependent Claim
23 words
Electronic signal processing means as claimed in claim 1 wherein the multiplier generator means generates multipliers, the sum of which is about one.
Claim 4
Dependent Claim
50 words
Electronic signal processing apparatus as claimed in claim 1 wherein the multiplier generator means generates each multiplier for each digital signal as the ratio of a function of that digital signal to the sum, for all of the voice signals, of such functions of all of the digital voice signals.
Claim 5
Dependent Claim
24 words
Electronic signal processing apparatus as claimed in claim 3 wherein said function of said multiplier generator means is the square of the digital signal.
Claim 6
Dependent Claim
26 words
The electronic signal processing apparatus as claimed in claim 1 wherein the multiplier generator means generates an individual multiplier for each sample of each digital signal.
Claim 7
Dependent Claim
20 words
Electronic signal processing apparatus as claimed in claim 1 further comprising μ law encoders for encoding the digital voice signals.
Claim 8
Dependent Claim
79 words
Electronic signal processing apparatus for combining N number of digital voice signals having a nonlinear relationship to underlying analog voice signals comprising: multiplier generator means for generating a multiplier K j for each sample of each digital signal P j (n) of the N digital voice signals such that: ##EQU4## digital multiplier means for multiplying each digital signal P j (n) with the generated K j (n); and digital summing means for summing the outputs of the multiplier means.
Claim 9
Dependent Claim
79 words
Electronic signal processing apparatus for combining N number of digital voice signals having a nonlinear relationship to underlying analog voice signals comprising: multiplier generator means for generating a multiplier K j for each sample of each digital signal P j (n) of the N digital voice signals such that: ##EQU4## digital multiplier means for multiplying each digital signal P j (n) with the generated K j (n); and digital summing means for summing the outputs of the multiplier means.
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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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |