Audio encoder adopting high-speed analysis filtering algorithm a

Details Audio encoder adopting high-speed analysis filtering algorithm a Audio encoder adopting high-speed analysis filtering algorithm a

1996-09-20

1998-09-15

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Audio signal time compression or expansion

704229, 704230, 704500, H03M 700, G06T 900

Patent

active

058094741

ABSTRACT:
An audio encoder/decoder adopting a high-speed analysis filtering algorithm is provided. The audio encoder has a mapping unit for classifying a received audio signal according to a frequency band by using the high-speed band analysis filtering algorithm, a psychoacoustic model for assigning bits to each frequency band using psychoacoustic characteristics, a quantizing and encoding unit for quantizing and encoding the mapped signal according to the number of bits assigned to each frequency band, and a frame packing unit for generating a bit stream from a signal output from said quantizing and encoding unit. The audio decoder has a frame unpacking unit for unpacking a signal from a coded and received bit stream, a decoding and inverse-quantizing unit for decoding and inverse-quantizing said quantized signal, and an inverse-mapping unit for time/frequency-inverse-mapping the inverse-quantized signal by using the high-speed band synthesis filtering algorithm.

REFERENCES:
patent: 5040217 (1991-08-01), Brandenburg et al.
patent: 5285498 (1994-02-01), Johnston
patent: 5481614 (1996-01-01), Johnston
patent: 5488665 (1996-01-01), Johnston et al.
patent: 5508949 (1996-04-01), Konstantinides
patent: 5535300 (1996-07-01), Hall et al.
IEEE Transactions on Consumer Electronics; Maturi, "Single Chip Audio Decoder", vol. 38, pp. 348-356, Aug. 1992.
IEEE Signal Processing Letters; Konstantinides, "Fast Subband Filtering in MPEG Audio Coding", vol. 1, No. 2, pp. 26-28, Feb. 1994.

Affiliated with

Also associated with

Rating

Audio encoder adopting high-speed analysis filtering algorithm a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Audio encoder adopting high-speed analysis filtering algorithm a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio encoder adopting high-speed analysis filtering algorithm a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-104181