DTMF Generator based on Interleaved Oversampling

Author

O´Leary, Paul ; Pauritsch, Manfred ; Maloberti, Franco ; Raschetti, Giamptero

Author_Institution

Austria Mikro Syst. Int. GmbH, Unterpremstaetten, Austria

fYear

1989

fDate

20-22 Sept. 1989

Firstpage

200

Lastpage

203

Abstract

A circuit is described which uses one oversampling frequency synthesizer in an interleaved mode to generate dual-tone multi-frequency (DTMF) telephone dialling tones. The synthesizer is based on direct digital synthesis using phase accumulation. The Digital to analogue conversion is carried out using a first order sigma-delta (ΣΔ). This ΣΔ converter is also used in interleaved mode. The smoothing filter consists of a simple second order RC filter.

Keywords

digital-analogue conversion; direct digital synthesis; mobile radio; sigma-delta modulation; smoothing methods; DTMF generator; digital to analogue conversion; direct digital synthesis; dual-tone multifrequency telephone dialling tones; first order sigma-delta converter; frequency synthesizer; interleaved mode; interleaved oversampling; phase accumulation; simple second order RC filter; smoothing filter; Capacitors; Circuit testing; Delta-sigma modulation; Digital filters; Frequency conversion; Frequency synthesizers; Mirrors; Read only memory; Smoothing methods; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1989. ESSCIRC '89. Proceedings of the 15th European

Conference_Location

Vienna

Print_ISBN

3-85403-101-7

Type

conf

DOI

10.1109/ESSCIRC.1989.5468097

Filename

5468097