Method for controlling echo canceller circuit

Details Method for controlling echo canceller circuit Method for controlling echo canceller circuit

1994-11-29

1997-01-14

Olms, Douglas W.

Multiplex communications

Duplex

Transmit/receive interaction control

379410, 379411, 395800, H04J 300

Patent

active

055947190

ABSTRACT:
The invention is a method for controlling an echo canceller circuit including a data storage for storing a program for processing digital signals to cancel an echo in PCM encoded voice data, a plurality of digital signal processors each having a reset terminal and which are downloaded with the program which is executed by the plurality of digital signal processor to carry out removal of the echo in the PCM encoded voice data, and a one chip controller for performing control functions of the echo canceller. The method comprises the steps after completion of initialization of the one chip controller, controlling the reset terminals of the digital signal processors to maintain all of the digital signal processors in reset state; releasing one digital signal processor from the reset state and downloading the program to the one released digital signal processor from the data storage; and the released one digital signal processor processing the PCM encoded voice data with the program to remove the echo from the PCM encoded voice data.

REFERENCES:
patent: 4554417 (1985-11-01), Boyer
patent: 5157653 (1992-10-01), Genter
patent: 5177734 (1993-01-01), Cummiskey et al.
patent: 5307505 (1994-04-01), Houlberg et al.
patent: 5349687 (1994-09-01), Ehlig et al.
patent: 5396641 (1995-03-01), Iobst et al.
patent: 5452289 (1995-09-01), Sharma et al.
patent: 5453986 (1995-09-01), Davis et al.

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