Telephone switching system frame sync generator
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United States of America Patent
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Jan 24, 1989
Grant Date -
N/A
app pub date -
Mar 3, 1987
filing date -
Mar 3, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit is described for use in a telephone switching system, for generating a large number of frame sync pulses that are progressively offset in time from one another, and that each control the operation of a pair of codecs (coder/decoder circuits). A high frequency clock signal is divided to generate a series of square waves that are 2's multiples of the lowest frequency square wave, such as 8 kHz, 16 kHz, 32 kHz, 64 kHz, and 128 kHz. These square waves are inputted to an integrated circuit of a type commonly used for addressing, to generate pulses on the several outputs at controlled different times, these pulses being delivered to the codecs. A plurality of such integrated circuits are used, with the inverse of the lower frequencies also being generated, and with different combination of the lower frequencies and their inverses delivered to different ones of the integrated circuits.
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