Title :
Analog circuit for sound localization applications
Author :
Tiwary, Saurabh Kumar ; Diamond, Brett ; Okerholm, Andrea
Author_Institution :
Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
29 June-1 July 2002
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 signal processing; acoustic variables measurement; circuit simulation; direction-of-arrival estimation; distance measurement; integrated circuit design; integrated circuit modelling; phase detectors; phase measurement; 1 ms; 10 kHz; CMOS analog circuits; low frequency applications; phase delay detection; phase difference detection; phase locking range; process variation robust circuits; sinusoid time delay computation; sinusoidal waveform receivers; sound source distance estimation; sound source localization; Analog circuits; Analog computers; CMOS analog integrated circuits; Delay effects; Digital signal processing; Hardware; Phase detection; Phase estimation; Robustness; Signal detection;
Conference_Titel :
Communications, Circuits and Systems and West Sino Expositions, IEEE 2002 International Conference on
Print_ISBN :
0-7803-7547-5
DOI :
10.1109/ICCCAS.2002.1178941
