Digital delay for high quality audio use
US4348754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1980 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | May 15, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C7/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.