Voice storage device and voice coding device

• US 7,164,755 B1
• Filed: 04/12/2000
• Issued: 01/16/2007
• Est. Priority Date: 08/13/1999
• Status: Expired due to Fees

• Current Assignee: OKI Electric Industry Company Limited
• Original Assignee: OKI Electric Industry Company Limited
• Inventors: Yokoyama, Atsushi
• Primary Examiner(s): Tsang; Fan
• Assistant Examiner(s): Gauthier; Gerald
• Application Number:
  US09/547,866
• Time in Patent Office: 2,470 Days
• Field of Search: 379/88.07, 379/88.11, 379/88.08, 379/88.1, 375/240, 375/244, 386/109, 704/221, 370/230
• US Class Current: 379/88.07
• 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 for storing a voice signal and a plurality of compression degrees, and

a voice compression means for compressing the voice signal requiring a re-coding compression, of the voice signal stored in the storage means, in accordance with one of the plurality of compression degrees and a significance of the voice signal,

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.

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 for storing a voice signal in real time in the storage means, and a non-vocalization interval detection means for determining 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 for recording 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, 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 comprising:

a storage unit to store a voice signal,

a compression degree register to store a plurality of compression degrees,

a voice compression unit to compress the voice signal requiring a re-coding compression, of the voice signal stored in the storage unit, in accordance with one of the plurality of compression degrees and a significance of the voice signal,

a real time processing unit to store a voice signal in real time in the storage unit; and

a non-vocalization interval detection unit to determine 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 unit, wherein, when the voice signal stored in the storage unit corresponds to the vocalization interval, the non-vocalization interval detection unit increases the significance of a voice signal before and after the vocalization interval.

12. A voice storage device as claimed in claim 11, wherein the storage unit stores the voice signal packeted by each coding type.

13. A voice storage device as claimed in claim 11, wherein the voice compression unit compresses the voice signal in parallel with storage of the voice signal in real time in accordance with a storage capacity of the storage unit.

14. A voice storage device comprising:

a storage unit to store a voice signal;

a storage unit residual quantity monitor to detect a residual quantity of the storage unit;

a compression reference table to store a plurality of compression degrees;

a voice compression unit to search the compression reference table, determine a compression degree from one of the plurality of compression degrees, and compress the voice signal in accordance with the determined compression degree and a significance of the voice signal;

a real time processing unit to store a voice signal in real time in the storage unit; and

a non-vocalization interval detection unit to determine 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 unit, wherein, when the voice signal stored in the storage unit corresponds to the vocalization interval, the non-vocalization interval detection unit increases the significance of a voice signal before and after the vocalization interval.

15. A voice storage device as claimed in claim 14, wherein the storage unit stores the voice signal packeted by each coding type.

16. A voice storage device as claimed in claim 14, wherein the voice compression unit compresses the voice signal in parallel with storage of the voice signal in real time in accordance with a storage capacity of the storage unit.