Channel synchronized audio data compression and decompression fo

Details Channel synchronized audio data compression and decompression fo Channel synchronized audio data compression and decompression fo

1997-01-23

1999-05-25

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal time compression or expansion

381 81, 455 31, G10L 302, H04J 306

Patent

active

059078278

ABSTRACT:
In an In-Flight Entertainment System (IFES), an audio distribution system transmits and synchronizes an audio data stream from multiple audio channels using the Adaptive Differential Pulse Code Modulation (ADPCM) technique for efficient transmission and preventing loss of synchronization. An encoder digitizes the analog audio signals, compresses the digital data, generates the synchronization parameters, including synchronization data for a selected channel, and creates a data frame to be transmitted to a number of decoders. Each decoder detects the synchronization header, extracts the compressed data patterns from the passenger selections, updates the ADPCM synchronization parameters, decompresses the compressed data patterns, and converts the digital audio data to analog audio signals to be delivered to the passenger seats.

REFERENCES:
patent: 5289272 (1994-02-01), Rabowsky et al.
patent: 5596647 (1997-01-01), Wakai et al.
patent: 5600365 (1997-02-01), Kondo et al.
patent: 5617331 (1997-04-01), Wakai et al.
patent: 5666151 (1997-09-01), Kondo et al.

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