Method and apparatus for operating on companded PCM voice data

Details Method and apparatus for operating on companded PCM voice data Method and apparatus for operating on companded PCM voice data

1984-09-28

1986-05-13

Roskoski, Bernard

Communications: electrical

Audible indication

Percussion-type sound producer

364768, 179 18BC, H03M 112

Patent

active

045889864

ABSTRACT:
A method and apparatus for digitizing audio signals being generated from a plurality of parties (A, B) in order to provide audio communication between the parties with a minimum of interference. Each of the parties has an audio transmitter and receiver (38, 58) provided for transmitting and receiving audio signals. The audio signals are converted (40) to a PCM companded eight-bit parallel signal followed by conversion (42) to a serial signal for transmitting to a remote location and then reconverting (46) each of the companded serial signals to a first eight-bit parallel signal. A pre-programmed ROM (48) is located at the remote location and has a plurality of inputs and outputs. Each of the eight-bit parallel signals from the individual parties are fed to the ROM causing the ROM to produce an eight-bit signal on the output representing the instantaneous sum of the eight-bit parallel signals being supplied to the inputs thereof. The eight-bit parallel signal appearing on the output of the ROM is converted to a serial-digital signal by a parallel-to-serial converter (50) for transmitting over a single line (52) to another serial-to-parallel converter (54) prior to being fed through a digital-to-analog converter to the receiver (58) for producing the audio signal at the receiver.

REFERENCES:
patent: 4230908 (1980-10-01), Davis et al.
patent: 4357674 (1982-11-01), Ikeda et al.
Brubaker et al., "Multiplication Using Logarithms Implemented with ROM," IEEE Trans. on Computers, vol. C-24, No. 8, Aug. 75.

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