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A special-purpose online processor for bandpass analysis

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2 Author(s)
Cappellini, V. ; Istituto di Ricerca sulle Onde Elettromagnetiche del C.N.R., Florence, Italy ; Emiliani, P.

The design of a special-purpose on-line processor for bandpass analysis with application to spectral estimation is described. The processor utilizes a digital filtering procedure based on the frequency shift of the sampled signal spectrum. A peculiarity of the processor is that it performs a bandpass analysis by using a unique set of digital filter coefficients for all the analyzed bands. A small and simple memory is therefore used as coefficient memory, while a special, but not complex, organization with many sections is required for the sample memory. The processing of an audio signal to obtain a type of digital vocoder is also considered. From the point of view of the actual implementation, only MSI and LSI circuits are used for the memory and arithmetic units.

Published in:

Audio and Electroacoustics, IEEE Transactions on  (Volume:18 ,  Issue: 2 )