US RE40,968 E1
	Encoding and decoding apparatus of LSP (line spectrum pair) parameters
Naoya Tanaka, Osaka (Japan)
Assigned to Panasonic Corporation, Osaka (Japan)
Filed on Nov. 02, 2001, as Appl. No. 9/948,181.
Application 09/948181 is a reissue of application No. 08/544600, filed on Oct. 18, 1995, now 5,802,487, filed on Sep. 01, 1998.
Claims priority of application No. 6-252011 (JP), filed on Oct. 18, 1994.
Int. Cl. G10L 19/04 (2006.01)

U.S. Cl. 704—230  [704/279; 704/E19.25]

14 Claims

[ 13. An LSP parameter decoding apparatus which receives a coded signal from i) a first quantizing means of an encoder for quantizing LSP parameters of an input voice signal into first vectors in a one frame unit independently or ii) a second quantizing means of the encoder for quantizing LSP parameters into second vectors by using a correlation between a present frame and a previous frame, said second quantizing means including a first step quantizing means for quantizing LSP parameters of the present frame into the second vectors in the one frame unit independently, and a second step quantizing means for quantizing a difference between the LSP parameters of the present frame and a predicted value of the present frame, said predicted value based on a quantized value by said first step quantizing means and a quantized value of the previous frame, said decoding apparatus comprising: error detecting means for detecting errors produced in quantization codes on a transmission line; and decoding means for outputting a decoded quantized value when a code of a further frame next to an error frame is produced by said first quantizing means and for outputting a decoded value from said first step quantizing means of said second quantizing means when the code of the further frame next to the error frame is produced by said second quantizing means.]