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Audio frequency spectrum analysis using MOS memory elements

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1 Author(s)
Bially, T. ; Massachusetts Institute of Technology, Lexington, Mass.

The speed of present-day logic elements is such that it is possible to effect real-time spectrum analysis of audio frequency signals by means of digital hardware. This paper describes a structure that computes the discrete Fourier transform of a 400-point time sequence in 10 ms. This allows the real-time analysis of signals having components in the range from dc to 5 kHz. A high-speed bipolar arithmetic section is used in conjunction with relatively slower MOS shift registers and READ-ONLY memory to provide an efficient and economical design.

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