Apparatus for recording and reproducing video signals with preem

Details Apparatus for recording and reproducing video signals with preem Apparatus for recording and reproducing video signals with preem

1996-02-29

1997-09-23

Tran, Thai Q.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358340, 360 331, 348607, 348613, H04N 576

Patent

active

056710666

ABSTRACT:
A video signal recording and reproducing apparatus comprises a magnetic tape (4) into which video signals are recorded. A preemphasis circuit (35) modifies the video signals prior to the recording into the magnetic tape (4), so as to increase magnitude of high-frequency components with respect to magnitude of low-frequency components on time base. A record start or end ID signal is generated in response to a record start or end signal in an ID signal recording circuit (36) which memorizes this ID signal into a corresponding portion of the magnetic tape (4). A mute circuit (46) resets the preemphasis circuit (35) in response to the record start or end signal. There is further provided a deemphasis circuit (37) for modifying the video signals after reproducing from the magnetic tape (4) in a complementary manner with respect to the preemphasis circuit (35), so as to decrease magnitude of high-frequency components with respect to magnitude of low-frequency components on time base. An ID signal detecting circuit (38) detects the record start or end ID signal from the magnetic tape (4) and generates an ID detecting signal. A mute circuit (49) resets the deemphasis circuit (37) in response to the ID detecting signal.

REFERENCES:
patent: 4618893 (1986-10-01), Kirota et al.
patent: 4750037 (1988-06-01), Kido et al.
patent: 5050009 (1991-09-01), Takahashi et al.
patent: 5223942 (1993-06-01), Sakaegi et al.
patent: 5257109 (1993-10-01), Minakawa

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