Apparatus for reproducing a pcm modulated signal, comprising a m

Details Apparatus for reproducing a pcm modulated signal, comprising a m Apparatus for reproducing a pcm modulated signal, comprising a m

1987-09-04

1989-09-05

Smith, Jerry

Excavating

371 401, G06F 1110

Patent

active

048645737

ABSTRACT:
An apparatus for reproducing a pulse-code-modulated signal comprises error-correction means (3) for correcting errors in one or more of the data words forming the pcm signal. When the error-correction means are no longer capable of correcting errors in the pcm signal, they produce error flags on an output (7), which error flags are applied to a control unit (9). From these error flags the control unit (9) derives a control signal which is applied to a muting unit (6) for switching on the muting unit.
A method is described by means of which the control unit derives the control signal from the error flags applied to its input (8). A first auxiliary signal (S.sub.1) is generated if (at least) n.sub.1 error flags are detected within a first time interval (T.sub.1). Subsequently, an i-th auxiliary signal (S.sub.1) is generated if (at least) n.sub.i error flags are detected within an i-th time interval (T.sub.i) which occurs after the instant at which the (i-1)-th auxiliary signal appears. The value of i ranges from 2 to N inclusive. Subsequently, a control-signal generator generates the control signal during a time interval T.sub.m which occurs after the instant at which the N-th auxiliary signal is received (FIG. 2). A number of examples of the control unit are described (FIG. 4).

REFERENCES:
patent: 4433415 (1984-02-01), Kojima
patent: 4498175 (1985-02-01), Nagumo
patent: 4675867 (1987-06-01), Masui
patent: 4727547 (1988-02-01), Brandes

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