Apparatus and method for coding excitation parameters in a very

Details Apparatus and method for coding excitation parameters in a very Apparatus and method for coding excitation parameters in a very

1996-02-20

1997-09-09

Olms, Douglas W.

Multiplex communications

Channel assignment techniques

Only active channels transmitted

704203, 704207, 704208, H04J 317

Patent

active

056663501

ABSTRACT:
An apparatus codes excitation parameters for very low bit rate voice messaging using a method that processes a voice message to generating speech parameters. The speech parameters are separated (316) to produce a first group of energy parameters and a second group of pitch and voicing parameters. Subsequently, the first group of energy parameters are encoded and compressed using a non-uniform root-mean-square scalar process (318) to create a first plurality of encoded data. Additionally, the second group of pitch and voicing parameters are compressed, encoded, and combined into a single parameter using a three slope vector encoding process (320) that creates a second plurality of encoded data. Finally, the first and second plurality of encoded data are multiplexed (322) to create a multiplexed signal for transmission, the multiplexed signal representing the voice message.

REFERENCES:
patent: 4076958 (1978-02-01), Fulgum
patent: 5271089 (1993-12-01), Ozawa
patent: 5473727 (1995-12-01), Nishiguchi et al.

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