US5559832A
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Method and apparatus for maintaining convergence within an ADPCM communication system during discontinuous transmission
Assignee: Motorola Mobility LLC
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Filing: 1995-03-16
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Granted: 1996-09-24
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Expires: 2015-03-16
Abstract
Abstract An information gap in an ADPCM signal is detected in one or both of a transmitter or receiver. This detection can be accomplished using a voice activity detector. When an information gap is detected, a clock signal to the encoder and/or decoder is interrupted. Alternatively, null frames can be inserted into the encoder and/or decoder. When null frames are used, it is preferable to insert comfort noise into the signal output from the decoder.
Inventors
- 👤 Kevin M. Laird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:25
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/012; H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/46; H04B14/00; H04B14/02; H04B14/06; H04B14/066; H04B14/068; H04J; H04J3/00; H04J3/16; H04J3/1682; H04J3/1688
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
105 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter having a voice activity detector (VAD), an information gap in a signal to be transmitted; controlling, at the transmitter, an encoder adaptation during the information gap by interrupting a clock of the encoder, the interruption being based, in part, upon an output from the VAD; transmitting an ADPCM signal, having the interruption, from said transmitter; and controlling a decoder adaptation upon receipt of the interruption of the ADPCM signal at a receiver.
Claim 2
Independent Claim
105 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter having a voice activity detector (VAD), an information gap in a signal to be transmitted; controlling, at the transmitter, an encoder adaptation during the information gap by interrupting a clock of the encoder, the interruption being based, in part, upon an output from the VAD; transmitting an ADPCM signal, having the interruption, from said transmitter; and controlling a decoder adaptation upon receipt of the interruption of the ADPCM signal at a receiver.
Claim 3
Independent Claim
113 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter, an information gap in a signal to be transmitted; controlling an encoder adaptation during the information gap; suspending transmission of an ADPCM signal during the information gap; detecting the suspension of transmission in the ADPCM signal at a receiver; controlling a decoder adaptation at the receiver when the suspension of transmission in the ADPCM signal is detected; generating a decoded signal from the decoder; and inserting comfort noise frames into the decoded signal when the suspension of transmission is detected.
Claim 4
Independent Claim
113 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter, an information gap in a signal to be transmitted; controlling an encoder adaptation during the information gap; suspending transmission of an ADPCM signal during the information gap; detecting the suspension of transmission in the ADPCM signal at a receiver; controlling a decoder adaptation at the receiver when the suspension of transmission in the ADPCM signal is detected; generating a decoded signal from the decoder; and inserting comfort noise frames into the decoded signal when the suspension of transmission is detected.
Claim 5
Dependent Claim
20 words
The method as in claim 2 wherein the step of detecting the information gap utilizes a voice activity detector (VAD).
Claim 6
Dependent Claim
38 words
The method as in claim 3 wherein the step of controlling the encoder adaptation during the information gap comprises the step of interrupting a clock signal to the encoder based, in part, upon an output from the VAD.
Claim 7
Dependent Claim
30 words
The method as in claim 2 wherein the step of controlling the decoder adaptation during the suspension of transmission comprises the step of interrupting a clock signal to the decoder.
Claim 8
Dependent Claim
34 words
The method as in claim 2 wherein the steps of controlling the encoder and decoder adaptations each comprises the step of inserting null frames into their respective encoder or decoder during the information gap.
Claim 9
Independent Claim
119 words
An apparatus for maintaining convergence of an encoder and decoder of a cellular adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said apparatus comprising: means for detecting using a voice activity detector (VAD), in a transmitter, an information gap in a signal to be transmitted; means for controlling an encoder adaptation of the encoder during the information gap by interrupting a clock of the encoder, the interruption being based, in part, upon an output from the VAD; means for generating an ADPCM signal from the transmitter having an interruption; and means for maintaining convergence by controlling a decoder adaptation of the decoder at a receiver during the detection of an interruption in a received ADPCM signal.
Claim 10
Independent Claim
119 words
An apparatus for maintaining convergence of an encoder and decoder of a cellular adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said apparatus comprising: means for detecting using a voice activity detector (VAD), in a transmitter, an information gap in a signal to be transmitted; means for controlling an encoder adaptation of the encoder during the information gap by interrupting a clock of the encoder, the interruption being based, in part, upon an output from the VAD; means for generating an ADPCM signal from the transmitter having an interruption; and means for maintaining convergence by controlling a decoder adaptation of the decoder at a receiver during the detection of an interruption in a received ADPCM signal.
Claim 11
Dependent Claim
22 words
The apparatus as in claim 7 further comprising means, in said transmitter, for suspending transmission of ADPCM signals during the information gap.
Claim 12
Independent Claim
98 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter, an information gap in a signal to be transmitted; suspending transmission of an ADPCM signal during the information gap; controlling an encoder adaptation of the encoder during the information gap to insert a null frame in the ADPCM signal being transmitted; detecting the null frame at a receiver; and controlling a decoder adaptation of the decoder, to maintain convergence, when the null frame is detected.
Claim 13
Independent Claim
98 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter, an information gap in a signal to be transmitted; suspending transmission of an ADPCM signal during the information gap; controlling an encoder adaptation of the encoder during the information gap to insert a null frame in the ADPCM signal being transmitted; detecting the null frame at a receiver; and controlling a decoder adaptation of the decoder, to maintain convergence, when the null frame is detected.
Claim 14
Independent Claim
121 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, using a voice activity detector (VAD) at a transmitter, an information gap in a signal to be transmitted; controlling an encoder adaptation of the encoder during the information gap by interrupting a clock signal to the encoder based, in part, upon an output from the VAD; and controlling a decoder adaptation by interrupting a clock of the decoder, the interruption being based, in part, upon an output from a quality detector, said output from said quality detector being generated upon receipt of an interruption in a signal generated by the encoder.
Claim 15
Independent Claim
121 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, using a voice activity detector (VAD) at a transmitter, an information gap in a signal to be transmitted; controlling an encoder adaptation of the encoder during the information gap by interrupting a clock signal to the encoder based, in part, upon an output from the VAD; and controlling a decoder adaptation by interrupting a clock of the decoder, the interruption being based, in part, upon an output from a quality detector, said output from said quality detector being generated upon receipt of an interruption in a signal generated by the encoder.
Claim 16
Dependent Claim
32 words
The method as in claim 10 further comprising the step of substituting predetermined frames from a memory into a signal generated by the decoder upon receipt of the interruption in the signal.
Claim 17
Independent Claim
101 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter, an information gap in a signal to be transmitted; controlling an encoder adaptation of the encoder during the information gap by inserting a null frame into the encoder; detecting, at a receiver, the null frame in a received ADPCM signal; and controlling a decoder adaptation of the decoder, at the receiver, during the null frame by inserting a noise frame signal into a signal generated by the decoder.
Claim 18
Independent Claim
101 words
A method of maintaining convergence of an encoder and decoder of an adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said method comprising the steps of: detecting, at a transmitter, an information gap in a signal to be transmitted; controlling an encoder adaptation of the encoder during the information gap by inserting a null frame into the encoder; detecting, at a receiver, the null frame in a received ADPCM signal; and controlling a decoder adaptation of the decoder, at the receiver, during the null frame by inserting a noise frame signal into a signal generated by the decoder.
Claim 19
Independent Claim
105 words
An apparatus for maintaining convergence of an encoder and decoder of a base site of a cellular adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said apparatus comprising: means for detecting using a voice activity detector (VAD), in a transmitter, an information gap in a signal to be transmitted; means for controlling an encoder adaptation during the information gap by inserting a null frame into the encoder; means for detecting using a quality detector, in a receiver, the null frame in an ADPCM signal; and means for controlling a decoder adaptation during the null frame by inserting null frames into the decoder.
Claim 20
Independent Claim
105 words
An apparatus for maintaining convergence of an encoder and decoder of a base site of a cellular adaptive differential pulse code modulated (ADPCM) communication system during discontinuous transmission, said apparatus comprising: means for detecting using a voice activity detector (VAD), in a transmitter, an information gap in a signal to be transmitted; means for controlling an encoder adaptation during the information gap by inserting a null frame into the encoder; means for detecting using a quality detector, in a receiver, the null frame in an ADPCM signal; and means for controlling a decoder adaptation during the null frame by inserting null frames into the decoder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |