Title :
A switched capacitor pitch extraction circuit using the autocorrelation function and its application to spectral analysis
Author :
Ogihara, Akio ; Yamashita, Shinsuke ; Yoneda, And Shojiro
Author_Institution :
Coll. of Eng., Osaka Prefectural Univ., Japan
Abstract :
In this paper, a new switched capacitor (SC) pitch extraction circuit using the autocorrelation function is proposed. This circuit extracts pitch frequency as a parameter of human voice in real time, and the maximum error is less than 0.84%. It is possible that the proposed circuit can be integrated into one LSI package, as it is constructed using the SC technique. In addition, a pitch synchronous spectral analyzer is realized by connecting this circuit to an SC discrete Fourier transform (DFT) circuit, and its validity is verified experimentally
Keywords :
correlation methods; large scale integration; linear integrated circuits; spectral analysis; speech analysis and processing; speech recognition; switched capacitor networks; LSI package; SC DFT circuit; autocorrelation function; discrete Fourier transform; pitch extraction circuit; pitch frequency; pitch synchronous spectral analyzer; real time; spectral analysis; switched capacitor; Autocorrelation; Discrete Fourier transforms; Frequency; Human voice; Joining processes; Large scale integration; Packaging; Spectral analysis; Switched capacitor circuits; Switching circuits;
Conference_Titel :
Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CICCAS.1991.184322
