Title :
Click modulation: an off-line implementation
Author :
Stefanazzi, Leandro ; Paolini, Eduardo ; Oliva, Alejandro
Author_Institution :
Inst. de Investig. en Ing. Electr.-IIIE (UNS-CONICET), Univ. Nac. del Sur, Bahia Blanca
Abstract :
This paper presents an off-line implementation of click modulation for portable audio amplifiers. This technique guarantees distortion-free baseband signals and due to its low switching rate reduces power consumption in Class-D amplifiers. Simple hardware implementation is possible and theoretically, exact signal recovery (demodulation) can be performed with a low-order low-pass filter. Hardware limitations, discrete time implementation issues and experimental results are discussed.
Keywords :
audio coding; audio-frequency amplifiers; demodulation; discrete time filters; low-pass filters; pulse width modulation; quantisation (signal); Class-D amplifiers; PWM; click modulation; demodulation; discrete time implementation issues; distortion-free baseband signals; encoding; hardware implementation; hardware limitations; low-order low-pass filter; off-line implementation; portable audio amplifiers; power consumption reduction; quantization effects; signal recovery; switching rate; Baseband; Demodulation; Distortion; Filtering theory; Hardware; Low pass filters; Power harmonic filters; Pulse amplifiers; Pulse width modulation; Topology;
Conference_Titel :
Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on
Conference_Location :
Knoxville, TN
Print_ISBN :
978-1-4244-2166-4
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2008.4616957
