Patent
Commutating narrowband filter
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TLDR
In this article, a signal to be filtered is applied to a commutating filter which is contred by a tunable oscillator tuned to a desired filter frequency, and the resulting digital words produced by the converter are used to compute the spectral content of the input signal by means of the Discrete Fourier Transform.Abstract:
A signal to be filtered is applied to a commutating filter which is contred by a tunable oscillator tuned to a desired filter frequency. The commutating filter includes a plurality of RC networks to which the input signal is sequentially connected. The output of the commutating filter is a series of discrete voltages from the capacitor sections and of the RC networks which are fed to an analog to digital converter. The resulting digital words produced by the converter are stored in a microprocessor and used to compute the spectral content of the input signal by means of the Discrete Fourier Transform. The computed output from the microprocessor represents the effect of the cascaded filter sections of the system.read more
Citations
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References
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Journal ArticleDOI
A High-Speed FFT Processor
TL;DR: A high-speed, low-power, fast Fourier transform (FFT) processor that performs a 128-point FFT in 250 μs at 16-MHz clock rate and therefore can be used for applications such as frequency-division multiplexing/timedivisionmultiplexing (FDM/TDM) transmultiplexer.
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