Digital audio disc system

Details Digital audio disc system Digital audio disc system

1985-04-15

1986-09-23

McElheny, Jr., Donald

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 32, 369 70, G11B 3100

Patent

active

046139656

ABSTRACT:
A digital audio disc system having a main channel in which main data consisting of audio PCM signals and codes for error correction are recorded and a subchannel in which information digital signals other than said main data are recorded is disclosed. The code signals comprising a sync signal which has a prescribed bit pattern, a display position data, a command for a computer, and a display data relating a content of said audio PCM signals are also recorded multi-times on the disc together with said main data so as to enable the error check of said code signals. Both code signals and main data are reproduced and supplied to a display unit so as to indicate the correct display information data on a display screen under control of a microcomputer provided in the playback side. When a pickup device moves on the disc in the radial direction at a speed higher than that in an ordinary playback operation, the display screen of said display unit is cleared or previously reproduced normal display data is held on the screen. When the pickup device does not start the playback of said display data from the display start position, the display data thus reproduced is made invalid until the display data at the display start position is reproduced. In this way, it is possible to prevent indication of abnormal display data.

REFERENCES:
patent: 4237497 (1980-12-01), Trevithick
patent: 4305131 (1981-12-01), Best
patent: 4321635 (1982-03-01), Tsuyuguchi

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