Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-01-06
1987-06-30
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
H03M 700
Patent
active
046774238
ABSTRACT:
In an ADPCM coder and decoder including a so-called locking-unlocking adaptation speed control, the adaptation speed is locked to a very slow, almost constant, speed of adaptation for voiceband data and partial band energy signals, i.e., tones and tone like signals, and is unlocked to achieve a fast speed of adaptation for speech. When a so-called partial band energy signal is being inputted, the adaptation speed is biased toward the unlocked state and when a transition occurs from a partial band energy signal to another such signal, the adaptation speed is set to the totally unlocked state and coefficients of an adaptive predictor are set to prescribed values. This is done in both the coder and decoder to minimize generation of impulse noise in the decoder output.
REFERENCES:
patent: 4375013 (1983-02-01), Cointot
patent: 4437087 (1984-03-01), Petr
patent: 4592070 (1986-05-01), Chow
CCITT Recommendation, Fascicle III.3-Rec. G.721,-7.2 Coding of Analogue Signals by Methods Other Than PCM--"32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)-(Malaga-Torremolinos 1984), pp. 125 through 159.
Benvenuto Nevio
Bertocci Guido
American Telephone & Telegraph, AT&T Bell Laboratories
Miller Charles D.
Stafford Thomas
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