Title:
DEVICE, METHOD, AND PROGRAM FOR EXPANDING FREQUENCY BAND
Document Type and Number:
WIPO Patent Application WO/2015/079946
Kind Code:
A1
Abstract:
The present technology relates to a device, method and program for expanding frequency band such that high quality audio can be obtained with less processing.
A low-frequency extraction bandpass filter allows a prescribed band in the low-frequency range of an input signal to pass and generates a low-frequency subband signal. A bandpass filter calculation circuit calculates a bandpass filter coefficient for the bandpass filter which passes various subbands for high frequencies on the basis of an estimated value of high-frequency subband power, and an addition unit adds these bandpass filter coefficients to form one filter coefficient. A polyphase level adjustment filter carries out up-sampling and level adjustment by filtering a flattened signal obtained from the low-frequency subband signal using the filter coefficient obtained by the addition unit and generates a high-frequency signal. The addition unit adds the high-frequency signal and the low-frequency signal to form an output signal. This technology can be used in devices for expanding frequency band.
Inventors:
YAMAMOTO YUKI (JP)
CHINEN TORU (JP)
CHINEN TORU (JP)
Application Number:
PCT/JP2014/080322
Publication Date:
June 04, 2015
Filing Date:
November 17, 2014
Export Citation:
Assignee:
SONY CORP (JP)
International Classes:
G10L21/0388; H03M7/30
Foreign References:
| JP2003108197A | 2003-04-11 | |||
| JP2013528836A | 2013-07-11 | |||
| JP2002073096A | 2002-03-12 |
Attorney, Agent or Firm:
NISHIKAWA Takashi et al. (JP)
Nishikawa 孝 (JP)
Nishikawa 孝 (JP)
Download PDF: