Call monitor apparatus for speech processing equipment

Details Call monitor apparatus for speech processing equipment Call monitor apparatus for speech processing equipment

1995-02-16

1998-02-03

MacDonald, Allen R.

Pulse or digital communications

Repeaters

Testing

375 27, G10L 708

Patent

active

057153647

ABSTRACT:
A call monitor apparatus for a speech processing equipment includes a digital speech processing equipment, a signal identifier, a switching unit, a decoder, a silent signal generator, a PCM converter, and a D/A converter. The digital speech processing equipment has a speech mode, a speech data mode, and a data mode. The signal identifier identifies an operation mode of the speech processing equipment and outputs an identification signal. The switching unit switches an output destination of the output signal from the speech processing equipment. The decoder converts an output signal from the switching unit into a .mu.law PCM signal when the identification signal from the signal identifier indicates the speech data mode. The silent signal generator outputs a silent .mu.law PCM signal when the identification signal from the signal identifier indicates the data mode. The PCM converter respectively converts, into PCM signals, an output signal output from the switching unit when the identification signal from the signal identifier indicates the speech mode and the .mu.law PCM signals from the decoder and the silent signal generator. The D/A converter converts the PCM signals from the PCM converter into analog signals.

REFERENCES:
patent: 4150258 (1979-04-01), Fujimoto et al.
patent: 4574383 (1986-03-01), Irie et al.
patent: 5239558 (1993-08-01), Shimizu
patent: 5384807 (1995-01-01), Yatim et al.
Haspeslagh et al., ("3.4/7 kHz Audio Bandwidth selectable digital phone interface (DPI) chip with on chip analog functions and modem", Proceedings of the Nineteenth European Solid State Circuits Conference, Sep. 22-23, 1993, pp. 162-165).
Haspeslagh et al., ("A 4/7kHz audio bandwidth selectable digital phone interface (DPI) chip with on-chip analog functions and modem", IEEE Journal of Solid-State Circuits, vol.29, Issue 8, Aug. 1994, pp. 914-920).

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