Electrical pulse counters – pulse dividers – or shift registers: c – Counting or dividing in incremental steps – Beam type tube
Patent
1987-02-24
1988-02-23
Miller, Stanley D.
Electrical pulse counters, pulse dividers, or shift registers: c
Counting or dividing in incremental steps
Beam type tube
328109, 377 39, 307271, 307265, H03K 301, H03K 522
Patent
active
047273313
ABSTRACT:
Pulses of constant pulse frequency but varying duty cycle are generated in a pulse generator which provides pulse trains or pulse sequences, as controlled by a pulse train or pulse length or sequence control unit coupled to the pulse generator and controlling the pulse generator to emit a train or sequence of pulses of similar pulse lengths, and further including a pulse length modulation control unit (12) coupled to the pulse generator and to the pulse train or sequence control unit, to control the length of the pulses of the individual pulse trains, the pulse lengths increasing in sequential pulse trains to provide an output signal of increasing intensity. The output from the pulse generator is filtered with respect to the base frequency, for example 800 Hz, and generated square wave pulses are converted into sawtooth wave pulses by a RC circuit to increase the dynamic range of output obtainable. The pulse generator (10), the pulse train length control unit (11) and the pulse length modulation control unit (12) can all form part of a digital microprocessor, generating the pulses, with intervening intervals to provide for a warning tone rhythm, the intervening intervals permitting the microprocessor to carry out calculating functions other than pulse generation for the warning tone.
REFERENCES:
patent: 3719897 (1973-03-01), Tarr
patent: 3836908 (1974-09-01), Hegendorfer
patent: 3838413 (1974-09-01), Wehermann
patent: 3870963 (1975-03-01), Groce et al.
patent: 3914580 (1975-10-01), Watson et al.
Blaupunkt Werke GmbH
Callahan Timothy P.
Miller Stanley D.
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