Title:
マスク限界を決定するための方法及び装置
Document Type and Number:
Japanese Patent JP3918034
Kind Code:
B2
Abstract:
A method and apparatus is disclosed for determining a masked threshold curve as a function of frequency from an information signal. The method includes (a) a first step of determining for each frequency value a first masking component MC(1,k) at the frequency value f(k) resulting from a frequency component at the frequency value and having a magnitude equal to the magnitude value PV(k) of the magnitude spectrum at the frequency value, (b) a second step of determining for subsequent frequency values when going in one direction through the frequency range of interest a second masking component MC(2,k) at a frequency value, the second masking component for the frequency value being determined from the first masking component MC(1,k-1) and a second masking component MC(2,k-1) at only the frequency value directly preceding the frequency value f(k-1), (c) a third step of determining for subsequent frequency values when going in the reverse direction through the frequency range of interest a third masking component MC(3,k) at a frequency value, the third masking component for the frequency value being determined from masking information that has a relation to at least the first masking component MC(1,k+1) and the third masking component MC(3,k+1) at only the frequency value f(k+1) directly preceding the frequency value, and (d) a fourth step for determining a masking value MV(k) for a frequency value in the masked threshold curve from masking information that has a relation to the first, second and third masking components (if present) for the frequency value.
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Inventors:
Van der Kerkhoff Leon Maria
Application Number:
JP52153296A
Publication Date:
May 23, 2007
Filing Date:
November 29, 1995
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G10L19/02; G10L19/035; G10L25/00; G10L25/18; G10L25/27; H03M7/30; H04B1/66; H04B14/04
Domestic Patent References:
| JP6075590A | ||||
| JP5313694A | ||||
| JP4219799A | ||||
| JP4503136A |
Other References:
James D.JOHNSTON, Transform Coding of Audio Signals Using Perceptual Noise Criteria, Selected Areas in Communications, IEEE Journal, 1988年 2月,Volume 6, Issue 2, Page(s):314-323
Attorney, Agent or Firm:
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
Akihiko Miyazaki
Fueda Shusen