Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-08-21
1981-05-12
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
365189, H04B 126, G11C 700
Patent
active
042676037
ABSTRACT:
A memory control circuit for controlling a write-in operation of an addressable memory circuit whereby a digital signal that is changeable over time is written into an addressed location in the memory circuit. An address register is provided for selecting the addressed location in the memory into which the digital signal is to be written. A control signal generator senses when a digital signal to be written into the memory circuit remains unchanged for a predetermined time interval so as to generate a control signal, this control signal being supplied to the address register for selecting the addressed location, and also being supplied to the memory circuit to initiate the write-in operation. If the digital signal does not remain constant for this predetermined interval, the write-in operation thereof is not carried out.
A preferred application of the present invention is to control a memory incorporated into an electronic radio frequency tuner, which memory is adapted to store a digital signal representing the last radio frequency which was received immediately prior to the interruption of power.
REFERENCES:
patent: 3953801 (1976-04-01), Podowski
patent: 4165489 (1979-08-01), Zato
Osakabe Yoshio
Yasuda Hiroshi
Bookbinder Marc E.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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