PCM signal reproducing apparatus with adjustable phase lock loop

Details PCM signal reproducing apparatus with adjustable phase lock loop PCM signal reproducing apparatus with adjustable phase lock loop

1988-09-15

1989-08-29

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 65, 360 67, G11B 502

Patent

active

048622966

ABSTRACT:
A clock regeneration circuit for use in data reproducing apparatus which reproduces and demodulates digital data that has been recorded on a magnetic medium in accordance with different types of modulation having different recording densities, such as biphase-mark modulation and 8-10 modulation, respectively. The clock regeneration circuit includes a phase locked loop for regenerating a clock signal from the clock component included in the reproduced data and comprises a switchable voltage controlled oscillator for selecting the frequency of a reference signal generated thereby in correspondence with the type of modulation which had been used for recording. Also included in the clock regeneration circuit is a phase comparator and a switchable low pass filter for supplying the output of the phase comparator to the voltage controlled oscillator, the time constant of the filter being selected in correspondence with the type of modulation that was used for recording. A control circuit controls the frequency selection of the voltage controlled oscillator and the time constant selection of the low pass filter in accordance with data signals supplied thereto.

REFERENCES:
patent: 4231071 (1980-10-01), Anderson
patent: 4472818 (1984-09-01), Zapisek et al.
patent: 4510461 (1985-04-01), Dickes et al.
patent: 4534044 (1985-08-01), Funke et al.
patent: 4542351 (1985-09-01), Okada
patent: 4577241 (1986-03-01), Wilkinson
patent: 4644419 (1987-02-01), Iinuma et al.
patent: 4780772 (1988-10-01), Shibaya et al.

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