Method and apparatus for determining a masked threshold

Details Method and apparatus for determining a masked threshold Method and apparatus for determining a masked threshold

1996-01-11

1997-11-11

Tung, Kee M.

395 212, G10L 302

Patent

active

056872828

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.

REFERENCES:
patent: 5274711 (1993-12-01), Rutledge et al.
patent: 5365553 (1994-11-01), Veldhuis et al.
patent: 5367608 (1994-11-01), Veldhuis et al.
patent: 5544247 (1996-08-01), Kate
Veldhuis et al., "Subband Coding of Digital Audio Signals", Philips J. Res., 44, pp. 329-343, 1989.

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