Adaptive predictive coding with transform domain quantization ba

Details Adaptive predictive coding with transform domain quantization ba Adaptive predictive coding with transform domain quantization ba

1993-10-15

1996-07-02

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Differential

371 371, 341 76, 375250, H04B 1406

Patent

active

055330525

ABSTRACT:
A codec uses a number of different signal processing techniques to improve audio compression. These techniques include (1) dynamically varying the size of the processing block to match the duration of the signal over which the audio signal can be considered to be substantially constant, (2) reducing the power gain of the LPC coefficients to reduce leakage of coding noise from one block into the following block, (3) allocating bits to the residual signal in accordance with both objective and subjective criteria, and (4) computing a modified residual signal to take into account the zero input response of the synthesis filters to the reconstruction noise of past blocks.

REFERENCES:
patent: 4815078 (1989-03-01), Shimura
patent: 5034965 (1991-07-01), Kato
patent: 5206884 (1993-04-01), Bhaskar
Tzeng et al, "Audio Coding and Transmission for Aeronautical Broadcast Via Satellite" Globecom'93: IEEE Global Telecommunicatons Conf. pp. 1299-1303.
Hussain et al, "Adaptive Block Transform Coding of Speech Based on LPC Vector Quantization," IEEE Transactions on Signal Processing vol. 39. No. 12 Dec. 1991. pp. 2611-2620.
Aarskog et al, "A long-term predictive ADPCM coder w/short-term prediction & vector Quantization", ICASSP 91. 1991 International Conf on Acoustics, Speech & Signal Processing pp. 37-40. vol. 1. NY, NY.
Chev et al. "Comparison of pitch prediction & adaptation algoriths in forward & backward adaptive CEIP systems" IEE Proceedings. vol. 140 No. 4 Aug. 1993.

Affiliated with

Also associated with

Rating

Adaptive predictive coding with transform domain quantization ba does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive predictive coding with transform domain quantization ba, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive predictive coding with transform domain quantization ba will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1513400