Reversible analog-to-digital converter

Details Reversible analog-to-digital converter Reversible analog-to-digital converter

1976-08-19

1978-09-05

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

179 15A, H03K 1302

Patent

active

041124278

ABSTRACT:
A method and apparatus for a telecommunication installation is disclosed for converting PAM analog signals into PCM digital signals and vice versa. A conversion circuit which is connected to a telephone station comprises an input register for temporarily storing the incoming PCM digital signals and an output register for temporarily storing the outgoing PCM digital signals. This conversion circuit includes a clock pulse generator which enables a counter to count through all its counter positions upon the appearance of each channel time slot pulse of the incoming PCM channel time slot pulse train. The input register and counter are connected to an intermediate register which in turn is connected to a digital-to-analog converter for converting the incoming PCM digital signal into an analog signal. This analog signal is sent to the receiving unit of the telephone station in a first time interval of the counter. The conversion circuit also comprises an analog comparator which is connected to the transmitting unit of the telephone station for receiving PAM analog signals. This PAM analog signal is converted into a digital signal in the intermediate register during a second time interval of the counter. The converted analog signal is then fed to the output register to be sent to the PCM switching center. Thus, the conversion circuit of this invention is time shared for use in converting both digital and analog signals.

REFERENCES:
patent: 3889063 (1975-06-01), Slavin

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