Precise call progress detector

Details Precise call progress detector Precise call progress detector

1985-08-12

1988-05-03

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307265, 307351, 328165, H03K 5153

Patent

active

047422513

ABSTRACT:
A circuit for providing a dynamic noise floor level. An analog to digital converter provides one of a plurality of outputs as determined by the level of an input signal. A comparator compares each digital input signal with the signal latched in a storage device. For an increasing digital signal the value is latched in a storage device. If the signal is decreasing, the value stored in the storage device is decremented by 1. The output of the storage device is coupled to a demultiplexor for digital to analog conversion. The outputs of the demultiplexor are coupled to a plurality of capacitors of varying capacitance so that a range of output signals may be achieved. The analog output of the circuit is used as a noise floor level in a precise call progress detector.

REFERENCES:
patent: 3737790 (1973-06-01), Brown
patent: 3968447 (1976-07-01), Baylac et al.
patent: 4122397 (1978-10-01), Thomas

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