Title :
Analog circuit for sound localization applications
Author :
Tiwary, Saurubh Kumar ; Diamond, Brett ; Okerholm, Andrea
Author_Institution :
Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
We describe an analog CMOS circuit that computes the time (phase) delay between two 10 kHz sinusoids. This circuit can be used in sound localization applications. We realize a locking range of 10 - 170 degrees in less than 1 ms that is robust over process variations. Two receivers placed at a distance from one another intercept a sinusoidal waveform emanating from a sound source. The phase difference between the two signals is detected by the circuit, which gives an estimation of the distance of the source from the receivers. This solution is simpler and more elegant than current digital techniques that require specialized DSP hardware to be implemented in real time.
Keywords :
CMOS analogue integrated circuits; acoustic measurement; acoustic radiators; acoustic receivers; circuit CAD; circuit simulation; integrated circuit design; integrated circuit modelling; phase measurement; position measurement; 1 ms; 10 kHz; CMOS analog circuits; DSP techniques; acoustic localization; audio receiver spacing; circuit locking range; circuit locking time; phase delay measurement; phase difference detection; process variation robust design; sinusoidal waveform time delay measurement; sound localization applications; sound source emanating sinusoidal waveform; source/receivers distance estimation; Analog circuits; Analog computers; CMOS analog integrated circuits; Delay effects; Digital signal processing; Hardware; Phase detection; Phase estimation; Robustness; Signal detection;
Conference_Titel :
ASIC, 2002. Proceedings. 2002 IEEE Asia-Pacific Conference on
Print_ISBN :
0-7803-7363-4
DOI :
10.1109/APASIC.2002.1031521
