Data compression/decompression apparatus with throttle, start-up

Details Data compression/decompression apparatus with throttle, start-up Data compression/decompression apparatus with throttle, start-up

1988-06-03

1990-02-06

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from packed format

341 87, 341106, 341 51, 375122, 370109, 358426, 364200, 364239, H03M 730

Patent

active

048991473

ABSTRACT:
A data compression/decompression apparatus employs common circuitry and a single string table for compression and decompression. A throttle control is provided to prevent data under-runs and an optimizing start-up control delays the start-up of the recording device until the compression apparatus has compressed sufficient data to effeciently reduce throttling and loss of compression when the output device is started. The decompression apparatus may operate to decompress compressed data when the compressed data is read in either the same direction as it was recorded, or read in the direction reverse to that in which it was recorded. A further feature is the provision of a counter which is incremented by one after a predetermined number of string codes have been written into the string table. The output of the counter is stored in the string table with each string code and prefix code. When searching for an empty or usable location in the string table, the count value read from the location is compared with the count in the counter. If the two counts are not equal then the location is considered "empty" and may be written into. This arrangement avoids the usual procedure of intermittently clearing each location of the string table individually since stepping the counter is equivalent to clearing the entire table.

REFERENCES:
patent: 4464650 (1984-08-01), Eastman et al.
patent: 4558302 (1985-12-01), Welch
patent: 4598411 (1986-07-01), Berkovich et al.
patent: 4730348 (1988-03-01), MacCrisken
patent: 4791403 (1988-12-01), Mitchell et al.
patent: 4796003 (1989-01-01), Bentley et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-444014