Synchronizing signal detection protective circuit

Details Synchronizing signal detection protective circuit Synchronizing signal detection protective circuit

Filed on

1981-09-24

Date issued

1983-07-12

Examiner

Richardson, Robert L.

Patent Class

Dynamic magnetic information storage or retrieval

SubClass

Monitoring or testing the progress of recording

Other Related Categories

358319, 358314, 360 381, H04N 504, G11B 2710

Type

Patent

Status

active

Patent number

043934196

Description

ABSTRACT:
A PCM recording reproducing apparatus transforms the audio signal into PCM data for recording the signal as a PCM signal in the television signal format on the video tape used in VTR, and transforms the PCM signal reproduced in the VTR back into the audio signal. The PCM apparatus is provided with a sync signal detection protective circuit which ensure the detection of the sync signal in the reproduced PCM signal. The sync signal detection protective circuit selectively uses two kinds of time gate signals in consideration of skew noises and so on. When skew does not occur, the signal with a short gating duration is selected, and only when skew, dropout, jitter or the likes has occurred failing to sample the sync signal, the signal with a long gating duration is selected.

REFERENCES:
patent: 3767849 (1973-10-01), Wessels
patent: 4024571 (1977-05-01), Dischert et al.
patent: 4313136 (1982-01-01), Kimura

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