whereby duration of pulse or interval between two pulses is variable

Full Title

Details of selecting apparatus or arrangements > Electrical details > Signalling arrangements; Manipulation of signalling currents (multiplex systems providing for calling or supervisory signals H04J1/14, H04J3/12) > whereby duration of pulse or interval between two pulses is variable

Child Classifications

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• H04Q 1/42 involving the position of a pulse in a cycle