Recursively splitting the low-frequency band with successively f

Details Recursively splitting the low-frequency band with successively f Recursively splitting the low-frequency band with successively f

1996-10-24

1999-07-20

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

704205, 382240, 382248, 348398, G06K 900, H04N 724

Patent

active

059267917

ABSTRACT:
A sub-band encoding method for splitting the frequency spectrum of an input signal into plural bands, encoding the signals of the respective bands and transmitting the encoded signal, is disclosed. The encoding method includes a first step of splitting the input signal into a signal of a high frequency band and a signal of a low frequency band using a first-stage low-pass filter and a first-stage high-pass filter, a second step of downsampling signals of respective frequency bands obtained by the first step, a third step of splitting the frequency spectrum of the low frequency band signal downsampled by the second step, using recursively a pre-set low-pass filter and a high-pass filter, for generating signals of a plurality of frequency bands, and a fourth step of encoding the signals of respective frequency bands obtained by the second step and the third step. The number of taps of the second-stage low-pass filter and the second-stage high-pass filter used in the third step is set so as to be smaller than the number of taps of the first-stage low-pass filter and the first-stage low-pass filter. In the case of splitting the frequency spectrum of a two-dimensional picture signal, the method may include high pass and low pass filtering at each stage in both horizontal and vertical directions, and the relationship involving the number of taps at each stage may be similar.

REFERENCES:
patent: 4184129 (1980-01-01), Macchi Ne Danjon et al.
patent: 4896356 (1990-01-01), Millar
patent: 5115240 (1992-05-01), Fujiwara et al.
patent: 5148498 (1992-09-01), Resnikoff et al.
patent: 5272656 (1993-12-01), Genereux
patent: 5420636 (1995-05-01), Kojima
patent: 5442399 (1995-08-01), Asamura et al.
patent: 5451954 (1995-09-01), Davis et al.
patent: 5537493 (1996-07-01), Wilkinson
patent: 5696708 (1997-12-01), Leung

Affiliated with

Also associated with

Rating

Recursively splitting the low-frequency band with successively f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Recursively splitting the low-frequency band with successively f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recursively splitting the low-frequency band with successively f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1331574