Reversible analog-to-digital converter

US4112427A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ernst Hofer · Munich, DE
• Peter Hirschmann · Puchheim, DE
• Klaus Wintzer · Munich, DE

Key dates

• Filing date: Aug 19, 1976
• Grant date: Sep 5, 1978
• Expiry date: Aug 19, 1996

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M1/504
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

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…