Digital intercept recorder/announcer system

Claim 1

A digital recorder/announcer system for use in conjunction with a telephone central office, said central office providing an audio input to said recorder/announcer system and said system providing an audio output suitable for connection to a telephone subscriber's line, said digital recorder/announcer system comprising: a clock providing for periodic pulses; a microprocessor CPU connected to said clock; a program memory connected to said microprocessor CPU; a memory interface unit connected between said CPU and said program memory; multiplexor means connected to said CPU, said multiplexor means operated in response to said periodic pulses to transmit said pulses to said CPU; converter means including a continuously variable slope delta modulator connected to said audio input and including circuit connections to said clock, said converter means operated in response to said audio signals received at said audio and in response to said CPU vai said clock to generate digital output signals; read/write memory means connected to said converter means and including circuit connections to and from said clock, said read/write memory means for storing said digital output signals, operated in response to each of said digital output signals and operated in response to said CPU via said clock to store a binary representation of said digital output signal; said clock operated in response to said CPU to selectively control the storage of said binary representations in said read/write memory one at a time and said clock alternatively operated in response to said CPU to selectively and sequentially control the retrievel of said binary representations for transmission to said converter means one at a time, so that said stored binary representations are read out from said read/write memory in the same order that said signals were stored in said read/write memory; said read/write memory means alternatively operated in response to said clock and to said stored binary representation, to read out and to transmit said binary representations to said converter means; and said converter means alternatively operated in response to said clock and to said binary representations read out of said read/write memory means to convert said binary representations to analog signals and couple said analog signals to said subscriber's line via said audio output.