Voice storage device and voice coding device

• US 20040013245A1
• Filed: 07/15/2003
• Published: 01/22/2004
• Est. Priority Date: 08/13/1999
• Status: Abandoned Application

• Current Assignee: OKI Electric Industry Company Limited
• Original Assignee: OKI Electric Industry Company Limited
• Inventors: Yokoyama, Atsushi
• Application Number:
  US10/618,596
• Publication Number:
  US 20040013245A1
• Time in Patent Office: Days
• US Class Current: 379/88.1
• CPC Class Codes: G10L 19/07 Line spectrum pair [LSP] vocoders
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: H04M 1/6505 storing speech in digital form

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.

Claims

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.