A monolithic audio spectrum analyzer for speech recognition systems
L.T. Lin, Hsin-Fu Tseng, D. Cox, R. Runge, D. Conrad · 1982
A speech recognition monolithic audio spectrum analyzer, using NMOS switched capacitor filter technology, will be covered. Chip consists of 16 channels, each containing a bandpass filter, half-wave rectifier and low-pass filter to detect the frequency components of the voice signal.