Bit clock signal generator for use in a digital signal demodulat

Details Bit clock signal generator for use in a digital signal demodulat Bit clock signal generator for use in a digital signal demodulat

1987-09-30

1988-10-11

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

329122, 358188, 455266, H04B 116

Patent

active

047774525

ABSTRACT:
This invention relates to a digital audio tape recorder using a rotary magnetic head. On the tape which has been recorded using R-DAT, signals forming to the industry standards are recorded at a standard tape speed. The tape is caused to run at a speed faster than the standard tape speed and the recording signal is subjected to high speed reproducing while maintaining the rotational frequency of the head at a rotational speed at the time of recording. For realizing this, a bit clock signal generator for use in a digital signal demodulator is provided, which comprises means for generating a detection window pulse having a predetermined pulse width shorter than a period of a bit clock signal from either of time points of rise and fall of the waveform of a signal to be demodulated, or from both the time points thereof, said signal to be demodulated being a digital signal modulated in accordance with a modulation system such as a system constituted with a periodical signal intermittently including a phase information of the bit clock signal to deliver the detection window pulse to a phase locked loop including a phase comparison circuit and a voltage controlled oscillator as a comparison wave, thus allowing the voltage controlled oscillator in the phase locked loop to generate a bit clock signal, characterized by the provision of means for changing the pulse width of the detection window pulse in correspondence with changes in a bit rate of the demodulated signal.

REFERENCES:
patent: 4617526 (1986-10-01), Hikawa et al.
patent: 4628282 (1986-12-01), Hikawa et al.
patent: 4672329 (1987-06-01), Hikawa

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