ENCODING DEVICE AND ENCODING METHOD

• US 20100057446A1
• Filed: 02/29/2008
• Published: 03/04/2010
• Est. Priority Date: 03/02/2007
• Status: Active Grant

• Current Assignee: III Holdings 12, LLC (Intellectual Ventures LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Morii, Toshiyuki, Oshikiri, Masahiro, Yamanashi, Tomofumi
• Granted Patent: US 8,719,011 B2
• Time in Patent Office: Days
• US Class Current: 704/205
• CPC Class Codes: G10L 19/038 Vector quantisation, e.g. TwinVQ audio
• CPC Class Codes: G10L 19/10 the excitation function being a multipulse excitation
• CPC Class Codes: G10L 25/18 the extracted parameters being spectral information of each sub-band

Abstract

Provided is an encoding device which can obtain a sound quality preferable for auditory sense even if the number of information bits is small. The encoding device includes a shape quantization unit (111) having: a section search unit (121) which searches for a pulse for each of bands into which a predetermined search section is divided; and a whole search unit (122) which performs search for a pulse over the entire search section. The shape of an input spectrum is quantized by a small number of pulse positions and polarities. A gain quantization unit (112) calculates a gain of the pulse searched by the shape quantization unit (111) and quantizes the gain for each of the bands.

Claims

1. A coding apparatus comprising:

a shape quantizing section that encodes a shape of a frequency spectrum; and

a gain quantizing section that encodes a gain of the frequency spectrum,

wherein the shape quantizing section comprises;

an interval search section that searches for a first fixed waveform in each of a plurality of bands dividing a predetermined search interval; and

a thorough search section that searches for second fixed waveforms over an entirety of the predetermined search interval.

2. The coding apparatus according to claim 1, wherein the thorough search section searches for the second fixed waveforms by evaluating coding distortion by an ideal gain per band.

3. The coding apparatus according to claim 1, wherein the thorough search section encodes position information of the second fixed waveforms based on a number of combinations of positions of the second fixed waveforms.

4. The coding apparatus according to claim 1, wherein the gain quantizing section calculates gains of the first fixed waveform and the second fixed waveforms on a per band basis.

5. A coding apparatus comprising:

a shape quantizing section that encodes a shape of a frequency spectrum; and

a gain quantizing section that encodes a gain of the frequency spectrum,

wherein the shape quantizing section searches for fixed waveforms by evaluating coding distortion by an ideal gain in each of a plurality of bands dividing a predetermine search interval.

6. A coding method comprising:

a shape quantizing step of encoding a shape of a frequency spectrum; and

a gain quantizing step of encoding a gain of the frequency spectrum,

wherein the shape quantizing step comprises;

an interval searching step of searching for a first fixed waveform in a plurality of bands dividing a predetermined search interval; and

a thorough searching step of searching for second fixed waveforms over an entirety of the predetermined search interval.