Title :
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
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;
Conference_Titel :
Solid-State Circuits Conference, 1989. ESSCIRC '89. Proceedings of the 15th European
Conference_Location :
Vienna
Print_ISBN :
3-85403-101-7
DOI :
10.1109/ESSCIRC.1989.5468097
