Digital information reproducing apparatus

Details Digital information reproducing apparatus Digital information reproducing apparatus

1987-02-05

1989-07-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 98, 307359, H04L 2506

Patent

active

048521264

ABSTRACT:
In a digital information reproducing apparatus, a digital signal having passed through a band-limited transmission system is waveform-shaped at a threshold level controlled to its optimal value so that the information can be properly read out. The apparatus includes a threshold level control circuit for controlling the threshold level to shape the waveform of the input signal. This threshold level control circuit has a first control circuit for controlling the threshold level with reference to a read clock extracted from the input signal, and a second control circuit for controlling the threshold level of a shaped signal which is obtained by waveform-shaping the input signal so that the DC component of the shaped signal becomes a predetermined value. The control of the threshold level is performed by cooperation of the first and second control circuits. The first control circuit is adapted to control the threshold level in accordance with a difference between the shaped signal obtained by waveform-shaping the input signal and the read-out signal obtained by synchronizing the shaped signal with the read clock. Thus, the threshold level for waveform-shaping a modulated channel code signal can be controlled optimally regardless of whether or not the modulation system is DC-free. The second control circuit serves to prevent a spurious lock of the first control circuit.

REFERENCES:
patent: 3731199 (1973-05-01), Tazaki et al.
patent: 4071829 (1978-01-01), Davis et al.
patent: 4363977 (1982-12-01), Tsuda et al.
patent: 4547733 (1985-10-01), Thoraval
patent: 4602374 (1986-07-01), Nakamura et al.
patent: 4619002 (1986-10-01), Thro
patent: 4625240 (1986-11-01), Yablonski et al.

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