Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-05-14
1981-10-20
Heyman, John S.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 340347AD, 235 97PE, 235 92PL, 328 14, 331 1A, H03L 718, H03K 1320
Patent
active
042964075
ABSTRACT:
A digital frequency synthesizer comprises a programmable frequency divider, an analog-to-digital converter for converting an analog program control signal into a digital signal, and a digital storage medium for storing the digital signal to control the frequency division ratio of the programmable frequency divider in accordance with the digital value of the stored signal.
REFERENCES:
patent: 3764831 (1973-10-01), Zwitter et al.
patent: 3790910 (1974-02-01), McCormack
patent: 3800236 (1974-03-01), Riethmuller et al.
patent: 3913028 (1975-10-01), Busselaers
patent: 3918048 (1975-11-01), Omura
patent: 4127766 (1978-11-01), Thayer
patent: 4140925 (1979-02-01), Meyer
patent: 4192993 (1980-03-01), Wechsler
Analog-Digital Conversion Handbook, published by Analog Devices Inc., Lib. of Cong. Catalog No. 72-85817, "Counter and Servo Types", pp. II, 51 and 52.
Heyman John S.
Matsushita Electric Industrial Co.
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