Signal compressing and transmitting apparatus

Details Signal compressing and transmitting apparatus Signal compressing and transmitting apparatus

1994-02-25

1996-12-17

Cumming, William

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

381104, 395 217, 395 223, 395 21, H03G 700, G01L 302, G01L 900

Patent

active

055861938

ABSTRACT:
Audio signals are compressed by selecting either a first compression mode providing high-quality sound and a relatively long processing time or a second compression mode having a shorter processing time in accordance with the contents of the audio input signals, for example, whether the signals are audio signals such as music or voice signals such as an announcement. By providing selectable compression time periods music can be enjoyed in high-quality sound, while the announcement of a message can be delivered satisfactorily without the loss of any information.

REFERENCES:
patent: 4330689 (1982-05-01), Kang et al.
patent: 4541110 (1985-09-01), Hopf et al.
patent: 5038402 (1991-08-01), Robbins
patent: 5054073 (1991-10-01), Yazu
patent: 5130662 (1992-07-01), Jorgensen et al.
Corporate Computer Systems, Inc., "CDQ 2000 Musicam.TM. Multi-Rate Digital Codec", 1992, pp. 1-5.

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