Method and apparatus for transmitting coded audio signals throug

Details Method and apparatus for transmitting coded audio signals throug Method and apparatus for transmitting coded audio signals throug

1997-12-11

2000-10-03

Woo, Stella

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379399, H04M 1100

Patent

active

061283746

ABSTRACT:
A digital audio transmitter system capable of transmitting high quality, wideband speech over a transmission channel with a limited bandwidth such as a traditional telephone line. The digital audio transmitter system includes a coder for coding an input audio signal to a digital signal having a transmission rate that does not exceed the maximum allowable transmission rate for traditional telephone lines and a decoder for decoding the digital signal to provide an output audio signal with an audio bandwidth of wideband speech. A coder and a decoder may be provided in a single device to allow two-way communication between multiple devices.

REFERENCES:
patent: 4972484 (1990-11-01), Theile et al.
patent: 5325423 (1994-06-01), Lewis
patent: 5706335 (1998-01-01), Hinderks
CDQ1000 Reference Manual, Revision 3.3, dated May 1994.
CDQ2000 Reference Manual, Revision 6.92-2, dated Jul. 27, 1994.
CDQ2001 Reference Manual, Revision 2.2-3, dated Aug., 1994.

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