Playback system with amplitude correction for frequency modulate

Details Playback system with amplitude correction for frequency modulate Playback system with amplitude correction for frequency modulate

1979-03-15

1981-11-10

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

358 8, H04N 579, H04N 5795

Patent

active

043001726

ABSTRACT:
Since frequency modulated signals such as color television signals are subject to amplitude changes as well as timing changes if the playback speed is not the same as the recording speed, a variable gain amplifier is provided. The gain of the variable gain amplifier is controlled by an error signal which corresponds to a measured difference between the recording and playback speed. The measured difference is derived from a phase comparison of separated color bursts and of the same bursts delayed by one line period. The amplitude corrected signals at the output of the variable gain amplifier are also applied to an amplitude measuring stage 16 whose output in turn controls the frequency characteristic of a filter filtering the color television signals prior to demodulation.

REFERENCES:
patent: 3501585 (1970-03-01), DeLange
patent: 3715462 (1973-02-01), Krause
patent: 4065787 (1977-12-01), Owen et al.
patent: 4165495 (1979-08-01), Takahashi et al.

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