Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-01-29
1977-01-11
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
325 38R, H03K 1324
Patent
active
040030423
ABSTRACT:
An improvement in applicant's co-pending application on a system for the transfer of point of time and direction of a transition between two states of an input by means of a code word of a predetermined plurality of bits, which improvement comprises using at least one less bit in the code word for indicating the direction of transition. The apparatus for carrying out this system comprises at a transmitter a device for scanning the input signal at a predetermined numbered of successive timed intervals corresponding at least to the number of bits in the code word to be generated, determining which interval or zone the transition in the binary input signal occurred, and generating the resulting code word in an encoder comprising logic circuits and a shift register having the same number of stages as bits in the code word. At the receiver the code word is reformed by registering it in a shift register having one more stage than the bits in the word, determining in a first logic circuit the direction of the transition, and in a second logic circuit the time zone in which the transition took place in order to regenerate the original binary signal. Usually two bits of the code word are used for indicating the time zone in which the transition occurred, and the other one or two-bits of the code word are used for indicating the direction of the transition. If two-bits are used for indicating the direction of transition, then three of the stages of the receiving shift register are connected to a majority of two out of three deciding circuit as the transition detector. In order to avoid erroneous transition detections as the bits received in the receiver shift register are shifted through the register, the stages for two-bits corresponding to the code of time zone are set to correspond with the stages for bits corresponding to the transition. For the scanning and generation of the pattern of repeated time zones and the number of bits in the code word, there are provided both at the transmitter and the receiver clock pulse generator and zone counter circuits.
REFERENCES:
patent: R27812 (1973-11-01), Lipp
patent: 3394312 (1968-07-01), Pfeiffer
patent: 3508228 (1970-04-01), Bishop
Travis et al. "The Bell System Technical Journal" Oct. 1965 pp. 1567-1604.
De Staat Der Nederlanden, Ten Deze Vertegenwoordigd Door De
Miller Charles D.
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