Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1992-07-29
1994-04-12
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
377 56, 307268, H03K 500, G06M 300
Patent
active
053032780
ABSTRACT:
In a capstan servo circuit, a waveform shaping error which might occur while shaping the waveform of an FG signal is suppressed to control the speed of a capstan motor stably. An FG signal from a frequency generator mounted on the shaft of the capstan motor is shaped in waveform by an amplifier and a comparator and is multiplied to double its frequency by a multiplier. The multiplied FG signal is inputted to an FV counter where the time from a rise to a subsequent fall of the waveform-shaped FG signal and the time from a fall to a subsequent rise of the same FG signal are counted. The count values are latched in order by two levels of latch circuits. The N-bit count values latched are inputted to an adder where a mean of the two count values is calculated by outputting the upper N bits and is supplied to the capstan motor as a servo signal.
REFERENCES:
patent: 4352158 (1982-09-01), Date et al.
patent: 4361857 (1982-11-01), Sakamoto
patent: 4445146 (1984-04-01), Sakamoto et al.
patent: 5057784 (1991-10-01), Park
patent: 5140256 (1992-08-01), Hara
Heyman John S.
Rohm & Co., Ltd.
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