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Patent Searching and Data


Title:
SAMPLING RATE CONVERSION DEVICE AND METHOD, AND AUDIO DEVICE
Document Type and Number:
WIPO Patent Application WO/2005/074131
Kind Code:
A1
Abstract:
There is provided a sampling rate conversion device capable of obtaining an amplitude characteristic passing through an arbitrary frequency and realizing a highly-accurate conversion not depending on the cut-off frequency. The sampling rate conversion device includes: an up-sampler (103) for inserting (U - 1) zero points between signals and increasing the sampling frequency Fsi by U; a convolution calculation unit (104) having a FIR filter for interpolating a value by convolution for the output signal of the up-sampler; and a linear interpolation block (105) for selecting samples at two points from the output signal of the convolution calculation unit (104) of the sampling frequency UFsi and calculating the value of the necessary position from the linear interpolation. The FIR filter has a filter coefficient which is an impulse response. A transmission function H(z) is correlated to a transmission function Z(z) of the pre-filter. The filter coefficient is correlated to the frequency response of the pre-filter and set by performing weighted approximation for a desired characteristic.

Inventors:
MOGI YUKIHIKO (JP)
NISHIZAKI HOMARE (JP)
Application Number:
PCT/JP2005/000515
Publication Date:
August 11, 2005
Filing Date:
January 18, 2005
Export Citation:
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Assignee:
SONY CORP (JP)
MOGI YUKIHIKO (JP)
NISHIZAKI HOMARE (JP)
International Classes:
G10L13/00; H03H17/00; H03H17/02; H03H17/06; (IPC1-7): H03H17/00; H03H17/06; G10L13/00; G10L19/00
Foreign References:
JPH06120776A1994-04-28
JP2002009591A2002-01-11
JPH06204797A1994-07-22
JP2002368543A2002-12-20
JPH10507891A1998-07-28
JPH05327409A1993-12-10
JPH07221598A1995-08-18
Attorney, Agent or Firm:
Satoh, Takahisa (4-2 Yanagibashi 2-chom, Taito-ku Tokyo 52, JP)
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