Telegraphy – Systems – Printing
Patent
1976-01-29
1977-02-01
Brown, Thomas W.
Telegraphy
Systems
Printing
178 691, H04J 306
Patent
active
040063143
ABSTRACT:
An elastic interface is disclosed for two communicating digital carrier systems autonomously synchronized to disparate time bases independent of each other in frequency and phase. The interface includes two arrangements, one for each direction of transmission between the two digital systems. In an illustrative application for the interface in a telephone system, the first of the two digital systems is a digital transmission system while the second is a time-division-multiplex switching network. The different internal constraints of each system call for digital signals at variance in sampling rate and code format. The interface amply satisfies the difference in sampling rate by an interpolation process which supplies the requisite number of intermediate encoded signal samples. Code conversion techniques are employed to match the code format of each digital system. Flexibility in the interpolation process is provided by adjusting the value of the encoded samples in response to changes in the relative time intervals between each encoded sample being supplied to one digital system and the encoded samples from the other digital system upon which it is derived. The digital signal medium established in the interface preserves the quality of the information traversing the medium as the digital signals coupled thereto undergo a change in sampling rate even though the autonomous operation of each of the two digital systems occasions relative frequency drift between the time bases of the two digital systems.
REFERENCES:
patent: 3869579 (1975-03-01), Karl
patent: 3916107 (1975-10-01), McDonald
patent: 3928727 (1975-12-01), Roche
patent: 3928755 (1975-12-01), Bellanger et al.
patent: 3936604 (1976-02-01), Pommerening
Condon Joseph Henry
Kieburtz Robert Bruce
Bell Telephone Laboratories Incorporated
Brown Thomas W.
Moran John Francis
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