Data compression method and apparatus

Communications: electrical – Audible indication – Percussion-type sound producer

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

364200, 364900, H03M 730

Patent

active

046821503

ABSTRACT:
A system and apparatus for compressing redundant and non-redundant binary data generated as part of an operation of a time and attendance terminal in which the data represents the time an employee is present during working hours. The first data entry includes the date and the time the employee operates the terminal together with other data identifying the employee which is stored in a circular buffer. The time of day data includes the hour and the minutes of the keyboard operation. Subsequent data entries include redundant data such as the date and the hour of the terminal operation which may not change and non-redundant data such as the minutes that pertain to the terminal operation together with data identifying the operator. After the redundant and non-redundant data of the first data entry are stored, only the non-redundant data of each subsequent data entry is stored. Upon reading out the non-redundant data from the buffer, a pointer which includes the redundant data such as the date and the hour of the first data entry is added to the non-redundant data read. If the date and/or hour changes, such changed data is stored in the buffer and is transferred to the pointer as the data is read out of the buffer, thus updating the data stored in the pointer.

REFERENCES:
patent: 3694813 (1972-09-01), Loh et al.
patent: 3717851 (1973-02-01), Cocke et al.
patent: 3925780 (1975-12-01), Van Voorhis
patent: 4021782 (1977-05-01), Hoerning
patent: 4031515 (1977-06-01), Kashio
patent: 4034350 (1977-07-01), Kashio
patent: 4232375 (1980-11-01), Paugstat

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

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

     

Profile ID: LFUS-PAI-O-209939

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.