Frequency subband encoding apparatus

Details Frequency subband encoding apparatus Frequency subband encoding apparatus

1995-09-25

1996-12-24

Chin, Stephen

Pulse or digital communications

Pulse code modulation

375240, 395 238, H04B 1404

Patent

active

055880240

ABSTRACT:
The invention provides a frequency subband encoding apparatus wherein the amount of comparison operation processing of a bit allocator is minimized. A subband filter divides a PCM signal into and outputs a plurality of frequency subbands. A SMR calculator calculates, for each of the frequency subbands, an SMR which is a ratio between a signal level and a mask level. A bit allocator calculates a reference NMR which is a value obtained by subtracting, from an SMR of the entire frequency band, a S/N ratio calculated from a reference bit number to be allocated to one of the frequency subbands which exhibits a maximum SMR, and adjusts the reference NMR to perform bit allocation to the frequency subbands.

REFERENCES:
patent: 5301255 (1994-04-01), Nagai et al.
patent: 5365553 (1994-11-01), Veldhuis et al.
patent: 5367608 (1994-11-01), Veldhuis et al.
patent: 5440596 (1995-08-01), Kneepkens et al.
patent: 5469474 (1995-11-01), Kitabatake
ISO/IEC 11172-3:1993 (E), pp. 70-71.

Affiliated with

Also associated with

Rating

Frequency subband encoding apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency subband encoding apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency subband encoding apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1184044