Speech compression

Details Speech compression Speech compression

1979-04-30

1981-11-17

Nusbaum, Mark E.

H03K 1332

Patent

active

043013333

ABSTRACT:
A device for providing real time speech compression and expansion and method therefor which enables speech data, sampled at a predetermined rate, and consisting of a preselected number of bits per sample, to be compressed in real time by a factor of approximately 2:1, and upon decompression, to be essentially indistinguishable from the original digitized speech. In particular, the apparatus employs a method which involves the digitizing of the input data, determining the maximum amplitude of the data over a short given period, compressing the data by dividing the largest amplitude constant from the data over the given period to obtain a data sample, and storing the reduced data sample and corresponding amplitude constant or gain factor in a suitable storage medium. In the preferred embodiment, the storage medium is a rotating memory or a recirculating shift register. Amplitude or gain factor data is stored in a memory that need be only one sixty-fourth the size of the main memory, since, in the embodiment illustrated, a single gain factor data representation is used with sixty-four sets of sample data. On recall, sets of the sample data are multiplied by their corresponding gain factor to reproduce the data for use.

REFERENCES:
patent: 3688221 (1972-08-01), Fruhalf
patent: 3696402 (1972-10-01), Armstrong
patent: 3875344 (1975-04-01), Bogart
patent: 3945002 (1976-03-01), Duttweiler et al.
patent: 3949298 (1976-04-01), Boxal
M. Croll "Nearly Instantaneous Digital etc.", Elec. Letters, Jul. 12, 1973, pp. 298-300.

Affiliated with

Also associated with

Rating

Speech compression does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1293795