Excitation vector generator, speech coder and speech decoder

• US 20070100613A1
• Filed: 08/24/2006
• Published: 05/03/2007
• Est. Priority Date: 11/07/1996
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Morii, Toshiyuki, Ehara, Hiroyuki, Yasunaga, Kazutoshi, Watanabe, Taisuke
• Application Number:
  US11/508,852
• Publication Number:
  US 20070100613A1
• Time in Patent Office: Days
• US Class Current: 704/223
• CPC Class Codes: G10L 19/12 the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
• CPC Class Codes: G10L 19/135 Vector sum excited linear prediction [VSELP]
• CPC Class Codes: G10L 2019/0007 Codebook element generation
• CPC Class Codes: G10L 2019/0013 Codebook search algorithms

Abstract

An excitation vector generator includes an input vector provider configured to provide an input vector having at least one pulse, each pulse having a pre-determined position and a respective polarity. An arranger is configured to arrange a waveform in accordance with the position and the polarity of the pulse. A shape of the waveform comprises a pulse-like shape and a length of the waveform is shorter than a length of a sub-frame.

Claims

1. An excitation vector generator, comprising:

an input vector provider configured to provide an input vector having at least one pulse, each pulse having a pre-determined position and a respective polarity; and

an arranger configured to arrange a waveform in accordance with the position and the polarity of the pulse,

wherein a shape of the waveform comprises a pulse-like shape and a length of the waveform is shorter than a length of a sub-frame.

2. The excitation vector generator of claim 1, wherein the input vector is provided from an algebraic codebook table.

3. A method of generating an excitation vector used in a speech encoder or decoder, the method comprising:

providing an input vector, having at least one pulse, each pulse having a pre-determined position and a respective polarity; and

arranging a waveform in accordance with the position and the polarity of the pulse,

wherein a shape of the waveform comprises a pulse-like shape and a length of the waveform is shorter than a length of a sub-frame.

4. The method of generating an excitation vector used in a speech encoder or decoder according to claim 3,

wherein the input vector is provided from an algebraic codebook table.