Apparatus for processing digital audio signal

Details Apparatus for processing digital audio signal Apparatus for processing digital audio signal

1991-10-15

1994-04-12

Macdonald, Allen R.

G10L 914

Patent

active

053033744

ABSTRACT:
A digital audio signal processing apparatus is provided having a predictive error generator for generating predictive error data by processing input digital data to acquire a plurality of different frequency characteristics. A selector selects one of the plural predictive error data. A requantizer requantizes the selected predictive error data. A corrector processes with a predetermined frequency characteristic, the requantization error induced during the operation of the requantizer, thereby correcting the requantization error caused in the requantizer. A frequency characteristic control selects at least two of the predictive error data obtained with the plural frequency characteristics, then calculates the selected predictive error data and controls the frequency characteristic in the corrector in accordance with the result of such calculation. In this apparatus, the ratio or the difference between at least two predictive error data obtained with a plurality of frequency characteristics is calculated and then is compared with a predetermined reference value. The frequency characteristic in the corrector is controlled in conformity with the numerical relation between the calculated value and the reference value. Therefore, two or more frequency characteristics in the corrector are selectively rendered conformable with one frequency characteristic in the predictive error generator, hence achieving an enhanced effect of further improving the signal-to-noise ratio.

REFERENCES:
patent: 2605361 (1952-07-01), Cutler
patent: 2724740 (1955-11-01), Cutler
patent: 4685115 (1987-08-01), Akagiri
patent: 4783792 (1988-11-01), Akagiri et al.
patent: 4797902 (1989-01-01), Nishiguchi et al.

Affiliated with

Also associated with

Rating

Apparatus for processing digital audio signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for processing digital audio signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for processing digital audio signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2106616