G - Physics – 11 – B
Patent
G - Physics
11
B
352/19.1, 352/32
G11B 20/18 (2006.01) H04N 5/94 (2006.01) H04N 9/88 (2006.01)
Patent
CA 1282168
ABSTRACT: Apparatus for reproducing a PCM-modulated signal, comprising a muting circuit. 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 (S1) is generated if (at least) n1 error flags are detected within a first time interval (T1). Subsequently, an i-th auxiliary signal (Si) is generated if (at least) ni error flags are detected within an i-th time interval (Ti) which occurs after the instant at which the (i-1)-th auxiliary signal appears. The value of ranges from 2 to N inclusive. Subsequently, a control-signal generator generates the control signal during a time interval Tm 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).
547690
Fetherstonhaugh & Co.
N.v. Philips Gloeilampenfabrieken
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