Data compression method and apparatus

Details Data compression method and apparatus Data compression method and apparatus

1983-12-14

1985-10-08

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

360 32, 375122, H03K 1300

Patent

active

045463425

ABSTRACT:
A music data compression system is disclosed which includes an analog to digital converter for converting the analog music signal to digital sample signal form, a digital compression filter for compression filtering the digital sample signals, and an encoder for truncated Huffman encoding the compression filter output. An entropy setting unit is included in the system for step control of the signal supplied to the digital compression filter in accordance with one or more threshold levels of the envelope of the music signal, and for reducing the entropy of the signal with increases in the energy level of the music signal. Different codes may be implemented in accordance with the threshold(s), and an identifying code word is inserted in the Huffman encoded stream. A decoder, digital reconstruction filter, and digital to analog converter are used to reconstruct the analog music signal. The identifying code word in the encoded signal stream to the decoder is used to select the necessary algorithm for decoding, and an entropy setting unit is included for step control of the gain of the digital reconstruction filter output under control of the identifying code word when step gain control is included prior to compression filtering.

REFERENCES:
patent: 3588836 (1971-06-01), Frazier
patent: 3750024 (1973-07-01), Dunn
patent: 3949299 (1976-04-01), Song
patent: 4185302 (1980-01-01), Mounts
patent: 4272648 (1981-06-01), Agrawal
Ruttimann "IEEE Transactions on Biomedical Engineering" vol. BME-26, No. 11, pp. 613-623, Nov. 1979.
Ripley "Pro. Comput. Cardiol." 1976, pp. 439-445.

Affiliated with

Also associated with

Rating

Data compression method and 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 Data compression method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data compression method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2222750