Digital delay for high quality audio use

Details Digital delay for high quality audio use Digital delay for high quality audio use

1980-05-15

1982-09-07

Faber, Alan

Dynamic information storage or retrieval

Signal processing by storage and subsequent retrieval

369 51, 369132, 365194, 364200, 364900, G11B 300, G11C 1500

Patent

active

043487548

ABSTRACT:
A disk mastering preview system utilizes an original audio signal from an audio source for previewing signals to be recorded by a disk lathe. Delayed audio signals corresponding to the original audio signals are produced for recording by the disk lathe a predetermined time delay thereafter. The original audio signals are sampled periodically by a sample and hold circuit to produce analog sample signals indicative of the signals sampled. An analog to digital converter converts the analog sample signals to corresponding digital sample signals. Successive digital sample signals are written into successively addressed memory locations and read out an adjustable predetermined number of memory addresses subsequently. A digital to analog converter converts the digital sample signals read out of memory into analog signals for recording. The predetermined number of addresses is set in a time delay register which produces a signal indicative of the number. The addressing of the locations is counted by a counter that produces a signal indicative thereof. The two signals are compared in a comparator. When the address count reaches the predetermined count, the comparator provides a signal that causes the addressing cycle to begin anew, thus producing the desired delay.

REFERENCES:
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patent: 3934094 (1976-01-01), Kobayashi
patent: 3950635 (1976-04-01), Constant
patent: 4064395 (1977-12-01), Schubeler
patent: 4121058 (1978-10-01), Jusko
patent: 4157460 (1979-06-01), Bottali
patent: 4215376 (1980-07-01), Moch
"An Audio Delay System Using Digital Technology" by Blesser et al., Journal of Audio Engineering Society, May, 1971, vol. 19, No. 5, p. 393.

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