Voice storage device and voice coding device

Abstract

The voice storage device of the invention includes a storage means that stores a voice signal, and a voice compression means that compresses the voice signal requiring a re-coding compression, of the voice signal stored in the storage means, in accordance with a compression degree and a significance of the voice signal. The voice coding device includes: an LSP quantizer that quantizes LSP parameters, an LSP multi-stage quantizer that quantizes quantization error components that the LSP quantizer is impossible to express, a pitch component coder that attains pitch components from linear predictive errors, an excitation source coder in which an excitation source is configured with a multi-stage code book, an essential code output unit that outputs a code essential to decoding from the output of the LSP quantizer, the pitch component coder, and the excitation source coder, and a sound quality improving code output unit that outputs a code to improve a decoded sound quality from the output of the LSP multi-stage quantizer and the excitation source coder.

What is claimed is:  
     
         1 . A voice storage device comprising: 
 a storage means that stores a voice signal, and    a voice compression means that compresses the voice signal requiring a re-coding compression, of the voice signal stored in the storage means, in accordance with a compression degree and a significance of the voice signal.    
     
     
         2 . A voice storage device as claimed in  claim 1 , wherein the storage means stores the voice signal packeted by each coding type.  
     
     
         3 . A voice storage device as claimed in  claim 1 , further comprising a real time processing means that stores a voice signal in real time in the storage means, and a non-vocalization interval detection means that determines a significance of the voice signal in accordance with whether the voice signal corresponds to a vocalization interval or to a non-vocalization interval, at an independent timing from a processing by the real time processing means.  
     
     
         4 . A voice storage device as claimed in  claim 3 , wherein, when a voice signal stored in the storage means corresponds to the vocalization interval, the non-vocalization interval detection means increases the significance of a voice signal before and after the vocalization interval.  
     
     
         5 . A voice storage device as claimed in  claim 1 , wherein the voice compression means compresses a voice signal in parallel to a storage of the voice signal in real time in accordance with a storage capacity of the storage means.  
     
     
         6 . A voice storage device as claimed in  claim 1 , further comprising a record means that records whether or not a voice signal is read more than once from the storage means, wherein the significance of a voice signal once read is decreased.  
     
     
         7 . A voice storage device as claimed in  claim 6 , wherein, when the voice signal once read is read again, the significance is not changed.  
     
     
         8 . A voice storage device as claimed in  claim 6 , wherein, even when the significance of a voice signal is changed, whether the significance is changed or not is determined in accordance with a storage capacity of the storage means.  
     
     
         9 . A voice storage device as claimed in  claim 1 , wherein the voice compression means includes a quantization table generation means that scans a voice signal stored in the storage means, and generates a quantization table for a coding compression.  
     
     
         10 . A voice storage device as claimed in  claim 9 , wherein the quantization table is packeted to be stored in the storage means, when a voice signal is read from the storage means, if the quantization table is made from the voice signal, the voice signal is decoded by using the quantization table.  
     
     
         11 . A voice storage device as claimed in  claim 1 , wherein the voice compression means executes a coding to a voice signal, in which the coding is divided into one using a code essential to decoding the voice signal and another one using a code to improve a sound quality of a decoded voice.  
     
     
         12 . A voice coding device comprising: 
 an LSP quantizer that quantizes LSP parameters;    an LSP multi-stage quantizer that quantizes quantization error components that the LSP quantizer is impossible to express;    a pitch component coder that attains pitch components from linear predictive errors;    an excitation source coder in which an excitation source is configured with a multi-stage code book;    an essential code output unit that outputs a code essential to decoding from the output of the LSP quantizer, the pitch component coder, and the excitation source coder; and    a sound quality improving code output unit that outputs a code to improve a decoded sound quality from the output of the LSP multi-stage quantizer and the excitation source coder.