Patent
1978-03-13
1980-02-19
Konick, Bernard
179 84VF, 179 1555T, 179 15AP, H04J 312
Patent
active
041896254
ABSTRACT:
A method and system for permitting high quality analog signal processing to multiple channel digital information signals, which requires a minimal number of analog signal processing elements and which is transparent to a host communication system.
Multiple channel digital information signals are time compressed by a factor sufficient to permit subsequent digital-to-analog conversion and analog signal processing, such as DTMF or FSK filtering, and conversion from one digital code to another, to be effected by circuitry which is common to all of a given number of information channels, with the processed analog signals then converted to resulting digital signals which are time expanded in such a manner as to be completely compatible with the digital signal flow format of the host communication system. Time compression is effected by storing the individual input digital signals in an input memory in their order of appearance at substantially the data input rate and reading the stored characters from the input memory at a substantially greater rate in information channel groups, each group comprising a predetermined number of samples from a particular channel. Each information channel group is processed in the analog domain and the resulting signals are converted to digital form and time expanded by storing the converted digital signals in an output memory and reading the stored signals from the output memory at rates preselected to provide the complementary time expansion.
Both contiguous time processing and packet processing, as well as a special time encoding/time decoding technique can be employed in the invention.
REFERENCES:
patent: 3936611 (1976-02-01), Poole
patent: 3980953 (1976-09-01), Nance et al.
Konick Bernard
Popek Joseph A.
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