Metering signal level control circuit

Details Metering signal level control circuit Metering signal level control circuit

1994-01-21

1995-09-19

Chin, Stephen

Telephonic communications

With usage measurement

Call charge metering or monitoring

379251, H04M 1500, H04M 1538

Patent

active

054523451

ABSTRACT:
An apparatus for controlling the magnitude of a metering signal used in a communication system includes a high pass filter and a threshold detector. The apparatus is preferably integrated on to a subscriber line audio-processing circuit (SLAC device) which is used on a line card. The device is operable with either 12 kHz of 16 kHz metering signals. The high pass filter preferably includes a shift register and an adder. The level detector preferably includes a shift register, an OR gate and an AND gate. The device preferably is utilized to reduce the echo or reflection caused by the variable impedance of subscriber lines in telephone communication systems.

REFERENCES:
patent: 5172407 (1992-12-01), Alemius
patent: 5329588 (1994-07-01), Willocx et al.

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