H - Electricity – 04 – R
Patent
H - Electricity
04
R
354/71, 179/9
H04R 5/04 (2006.01) G11B 20/00 (2006.01) G11B 20/10 (2006.01) G11B 23/00 (2006.01) G11B 27/30 (2006.01)
Patent
CA 1083488
Applicant: William E. Whitlock Docket No. 2081-101 For: Pulse Code Modulated Digital Audio System BRIEF ABSTRACT The instantaneous amplitude of an analog audio signal is periodically sampled to be converted into multibit binary digital words representing the sampled amplitude. The bits of successive binary words are reproduced serially with appropriate word and frame synchronising pulses in quarternary coding to pulse code modulate the FM carrier signal used in standard video recording. The recorded signal is demodulated on playback to reproduce successive digital words that are converted in-to discrete analog values which are low pass filtered to reproduce the original audio signal. The reproduced digital values are also stored in successive address locations of a random access memory. Upon detecting data drop-out, such as by monitoring the FM carrier in the reproduced signal, the memory address sequence is reversed to read out the previously entered values backwards, thus approximating the roughly symmetrical waveform envelope of normal high frequency musical signals so as to avoid discernable discontinuity in the audio output. At the same time, timing pulses are delivered to decrease gradually the bandwidth of the voltage controlled low pass filter to smooth the sample outputs from the memory. When actual data is reacquired, timing pulses used to increment the memory address gradually restore the maximum bandwidth of the voltage controlled low pass filter. 1.
279391
Gowling Lafleur Henderson Llp
Lase Industries
LandOfFree
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