Canadian Patents & Development Ltd.

Sed Systems Ltd.

Andrzej M Sendyk

David E Dodds

Dennis W Johnson

Donald B Wohlberg

An adaptive delta modulation system wherein the input analog signal is periodically sampled and a binary bit is generated for each period, the logic level of the binary bit being dependent on whether the sampled signal is greater or smaller than the approximate signal of the previous sample. Decoding apparatus converts the stream of binary bits to approximate the analog signal by periodically charging or discharging a capacitor integrator by predetermined variable steps. The charging or discharging of the integrator during each period is determined by the logic level of the binary bits, whereas the increase or decrease in step size for successive periods is determined by successive similar signal binary bits or successive dissimilar bits, respectively. The increase or decrease in step size is achieved by storing a binary step size number S in a register and adding or subtracting a fraction of the number to or from itself during each period, producing a new step size number for each period. In addition, each added fraction may be increased by a fixed least significant number to enhance step size recovery between a transmitter and a receiver. The charge on the capacitor integrator is controlled by a pulse having a width that is directly related to the value of the S number. The pulse controls the conduction time of constant current sources which are connected to the integrator to produce the analog output signal.

Adaptive digital delta modulation for voice transmission

An automatic dialer which receives address digits dialed from a telephone set and outdials a destination number. A programmable Send Only M.O.S. Memory stores a plurality of destination numbers at address locations. The dialer can be connected to a telephone line at the central office, at the subscriber's location, or anywhere on the line, to a PBX trunk, either at the PBX or the control office. The dialer can be made transparent to dialed digits upon receipt of a predetermined digit.

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Saskatoon, Canada

Andrzej M Sendyk