All digital conference unit

Details All digital conference unit All digital conference unit

H - Electricity

04

M

H04M 3/56 (2006.01)

Patent

CA 2069973

ABSTRACT AN ALL DIGITAL CONFERENCE CIRCUIT In order to accomplish the object of the present in- vention there is provided a digital conference circuit for creating a conference call. The digital conference circuit includes a time slot assigner that determines an appropriate time to extract from the PCM bit stream and to inject into the PCM bit stream. There are a plurality of CHANNEL DSP that extract the digital voice samples from the PCM data stream, where each of the plurality of CHANNEL DSP extracts from the digital voice samples one unique digital voice sample that represents an individual party to the conference call. After extracting the digi- tal voice samples, the plurality of CHANNEL DSP converts the samples from a logarithmic format to a linear format. The plurality of CHANNEL DSP next remove any echo from the linear voice samples. Next, a CONFERENCE DSP re- ceives the linear voice samples from the plurality of CHANNEL DSP and determines their sum. The plurality of CHANNEL DSP subtracts from the sum the digital voice sam- ple that represents the unique individual party, to cre- ate individual conference sum samples. Finally, the plu- rality of CHANNEL DSP convert the individual conference sum samples to a logarithmic format. The plurality of CHANNEL DSP then injects the logarithmic voice samples into the PCM data stream.

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