Digital tone generator for tone sequences

US4516113A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Bruno Scheckel · Ebersberg, DE
• Ernst Wittenzellner · Munich, DE

Key dates

• Filing date: Oct 21, 1981
• Grant date: May 7, 1985
• Expiry date: Oct 21, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G10H1/26
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Semiconductor circuits for the automatic generation of tone sequences of different tones. A bistable switch having a control input activated by start signal controls a voltage stabilizing circuit which in turn controls an RC-oscillator. Several frequency dividers are driven by the oscillator for producing divider outputs as tone signal outputs furnishing individual tone frequencies corresponding to the tone sequences to be produced. A general cycle control has inputs controlled by the first divider output. Modulator modules driven by the cycle control and by the tone signal outputs, are connected to the digital-to-analog converters which produce tone signal outputs that correspond to the individual tone frequencies. The digital-to-analog converters have outputs that are jointly connected to an electro-acoustic transducer, such as a loudspeaker.