Additive PCM speaker circuit for a time shared ISDN conference a

Details Additive PCM speaker circuit for a time shared ISDN conference a Additive PCM speaker circuit for a time shared ISDN conference a

1987-11-02

1989-05-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379202, H04Q 1104

Patent

active

048316180

ABSTRACT:
A time shared multiport conference arrangement includes an additive PCM speaker circuit. The additive PCM speaker circuit eliminates the need for loudest speaker detection and the last speaker memory of conventional conferencing arrangements. The additive PCM speaker circuitry operates in an on-line, real time environment to allow rapid conversion and summing of speakers' PCM voice samples. Since the PCM voice samples are logarithmic in nature, they are not directly combinable. The additive PCM speaker circuitry provides for converting the logarithmic PCM signals to linear form. Next, the linear signals of up to three conferees are buffered. Then the speakers' linear form samples are added and each combination reconverted from linear to logarithmic form. The additive PCM speaker circuit simplifies the complex processing logic usually associated with loudest speaker detection systems and thereby improves the real time operation of the conferencing arrangement.

REFERENCES:
patent: 4466092 (1984-08-01), Renner
patent: 4466093 (1984-08-01), Renner
patent: 4466094 (1984-08-01), Renner
patent: 4477897 (1984-10-01), Lane
patent: 4486879 (1984-12-01), Baltz
patent: 4581733 (1986-04-01), Sarson et al.
patent: 4648089 (1987-03-01), Hsing
patent: 4757494 (1988-07-01), Renner

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