Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-08-30
1985-02-26
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
179 84VF, 328139, 328151, H04Q 914
Patent
active
045020493
ABSTRACT:
An inexpensive universal telephone signalling tone receiver employs switched capacitor filters to provide selective tone reception in accordance with pre-selected clock signal frequencies. The clock signals, which in the preferred embodiment are provided from an EPROM, are employed to determine the pass band center frequency for respective filters. The selected signalling tones, when received, are rectified and passed to respective sample and hold circuits, the output signals of which are sequentially applied for processing to a common analog-to-digital converter through a multiplexer. Depending upon the clock pulse frequencies programmed for a particular application, the receiver can be used for various signalling protocols, including R1 and R2, in either direction, as well as other single or multi-tone signalling applications. In multifrequency signalling applications, the receiver selectivity permits the processing circuitry to look for two tones of significant amplitude among noise components rather than to continuously adjust threshold detectors, in response to the wide band signal level.
REFERENCES:
patent: 4354248 (1982-10-01), Conger
patent: 4369338 (1983-01-01), Soulliard
patent: 4370650 (1983-01-01), Norrell
Itec, Inc.
Yusko Donald J.
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