Invention Grant
- Patent Title: Speech encoding apparatus and speech encoding method
- Patent Title (中): 语音编码装置和语音编码方法
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Application No.: US12088300Application Date: 2006-09-29
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Publication No.: US08396717B2Publication Date: 2013-03-12
- Inventor: Masahiro Oshikiri
- Applicant: Masahiro Oshikiri
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Greenblum & Bernstein, P.L.C.
- Priority: JP2005-286533 20050930; JP2006-199616 20060721
- International Application: PCT/JP2006/319438 WO 20060929
- International Announcement: WO2007/037361 WO 20070405
- Main IPC: G10L21/04
- IPC: G10L21/04

Abstract:
There is provided an audio encoding device capable of maintaining continuity of spectrum energy and preventing degradation of audio quality even when a spectrum of a low range of an audio signal is copied at a high range a plurality of times. The audio encoding device (100) includes: an LPC quantization unit (102) for quantizing an LPC coefficient; an LPC decoding unit (103) for decoding the quantized LPC coefficient; an inverse filter unit (104) for flattening the spectrum of the input audio signal by the inverse filter configured by using the decoding LPC coefficient; a frequency region conversion unit (105) for frequency-analyzing the flattened spectrum; a first layer encoding unit (106) for encoding the low range of the flattened spectrum to generate first layer encoded data; a first layer decoding unit (107) for decoding the first layer encoded data to generate a first layer decoded spectrum, and a second layer encoding unit (108) for encoding.
Public/Granted literature
- US20090157413A1 SPEECH ENCODING APPARATUS AND SPEECH ENCODING METHOD Public/Granted day:2009-06-18
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