Time base corrector

Details Time base corrector Time base corrector

1988-07-07

1990-02-27

Shoop, Jr., William M.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

341110, H04N 578

Patent

active

049051016

ABSTRACT:
A disclosed time base corrector comprises a clock generater for generating a clock signal whose period is fixed, an analog-to-digital converter for sampling amplitude values of an input analog signal having a time base error at sampling points given by the clock signal, an adaptive interpolation filter for interpolating a correct amplitude value at a resampling indicated by a resampling position signal, a resampling position signal producing circuit for detecting the time base error and producing from the detected error the resampling position signal, and a digital-to-analog converter for converting the interpolated amplitude values to an analog signal which has no time base errors. The time base correction is implemented by pure digital signal processing without any analog signal processing. The time base corrector does not use such a clock signal that has time base fluctuations.

REFERENCES:
patent: 3931638 (1976-01-01), Lentz et al.
patent: 4120000 (1978-10-01), Ninomiya
patent: 4675724 (1987-06-01), Wagner
patent: 4677499 (1987-06-01), Shirota et al.
patent: 4733312 (1988-03-01), Morimoto
Sadashige, "Overview of Time-Base Correction Techniques and Their Application", SMPTE Journal, vol. 85, Oct. 1976, pp. 787-791.

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