Pulse code modulation compression mechanism

Pulse code modulation compression mechanism

A pulse code modulation (PCM) unit is connected to a bus in a computer system. Also, connected to the bus is a processor and memory. The PCM unit is connected to transmit and receive telephone lines. The PCM unit reads uncompressed PCM data from the memory over the bus and compresses the PCM data fo...

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Hauptverfasser: MANDALIA, BAIJU DHIRAJLAL, ANDREWS, LAWRENCE PAUL, SINIBALDI, JOHN CLAUDE, ROBINSON, JR., WILLIAM ROBERT
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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creator MANDALIA
BAIJU DHIRAJLAL
ANDREWS
LAWRENCE PAUL
SINIBALDI
JOHN CLAUDE
ROBINSON, JR.
WILLIAM ROBERT
description A pulse code modulation (PCM) unit is connected to a bus in a computer system. Also, connected to the bus is a processor and memory. The PCM unit is connected to transmit and receive telephone lines. The PCM unit reads uncompressed PCM data from the memory over the bus and compresses the PCM data for transmission over the telephone line in a cycle steal operation, wherein the bus is not being used by the processor. The PCM receives compressed PCM data from the receive telephone line, decompresses it, and writes the decompressed PCM data to the memory in a cycle steal operation. In addition, selectivity of either mu -Law or A-Law conversion, selectivity of even bit inversion for A-Law conversion, and selectivity between the compressed/decompressed PCM data or raw data is provided on a per channel basis. Selectable linear gain is also provided.
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
title Pulse code modulation compression mechanism
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