Invention Grant
US08396717B2 Speech encoding apparatus and speech encoding method 有权
语音编码装置和语音编码方法

  • 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
  • Application No.: US12088300
    Application Date: 2006-09-29
  • Publication No.: US08396717B2
    Publication 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
Speech encoding apparatus and speech encoding method
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.
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