Circuit arrangement for the digital correction of time base erro

Details Circuit arrangement for the digital correction of time base erro Circuit arrangement for the digital correction of time base erro

1978-01-30

1980-07-29

Moffitt, James W.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

358148, H04N 504

Patent

active

042153760

ABSTRACT:
In a circuit arrangement for the digital correction of time base errors in a television signal this signal is converted into digital television signals with a certain clock frequency in an analog/digital converter, which signals are consecutively written into the individual addresses of a random access memory (RAM) with the same clock frequency and in the meantime are read from specific addresses of the memory with the same frequency. Which addresses are read depends on the magnitude and sign of the time base error, which is determined in a detection circuit from a comparison signal of the television signal and is converted into digital time base error signals which are quantized with a given time interval, which error signals are applied to an address signal which depending on the number of time intervals, which are defined by the clock frequency, in the time base error signals relative to the number of addresses of the memory controls the selection of the addresses to be read.

REFERENCES:
patent: 3900885 (1975-08-01), Tallent et al.
patent: 4028729 (1977-06-01), Browder
patent: 4054921 (1977-10-01), Tatami
patent: 4069499 (1978-01-01), Ninomiya
patent: 4081826 (1978-03-01), Ninomiya
patent: 4101939 (1978-07-01), Owen et al.
Coleman, "A New Technique for Time-Base Stabilization of Video Recorders", Mar. 1971, pp. 29-36, IEEE Transactions on Broadcasting, vol. BC-17, No. 1.

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