H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
363/17
H04Q 3/06 (2006.01) H04J 3/06 (2006.01)
Patent
CA 1136782
ABSTRACT OF THE DISCLOSURE: An elastic buffer memory for synchronous demultiplexer, particularly for use in time-division transmission systems comprises: an input register having n memory cells and supplied with a sequence of impulses coming from the line, each of these impulses having a period t; a buffer register adapted to receive in parallel the data of the input register with periodicity T = n?t; a random access memory whose data input is connected to the data register; a writing address generator which is operated by timing impulses extracted from the line, the said generator supplying the said memory with the address in which the data of the buffer register are to be allocated; a reading address gene- rator which is operated by timing impulses generated by a local oscillator which supplies the said memory with the address where there are allocated the data to be transferred in an output register. The memory is characterized in that the writing address generator is connected in parallel to a writing time ge- nerator capable of providing at a first output a first sequence of impulses, each having length t and available at the beginning of each time interval T, as well as to provide at its second output a second sequence of impulses having a length t, too and available at the end of each time interval T; a reading time generator adapted to produce a third sequence of impulses having time interval T and length 2t having connected in parallel to the reading address generator; and comprising control means adapted to detect the coincidence between the impulses of the first sequence and the impulses of the third sequence and also adapted to send the second sequence of impulses to the said me- mory and/or the first sequence of impulses in reply to the pre- sence or absence of the aforementioned coincidence.
337868
Italtel S.p.a.
Robic Robic & Associes/associates
LandOfFree
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