Digital signal processing apparatus for a blood flowmeter using

Details Digital signal processing apparatus for a blood flowmeter using Digital signal processing apparatus for a blood flowmeter using

1983-12-05

1987-02-03

Thomas, James D.

Boots, shoes, and leggings

364726, 364416, G06F 1100, G06F 1535, G06F 1542, G06F 734

Patent

active

046412603

ABSTRACT:
A digital signal processing apparatus is shown which is applicable for real time operation in the power spectrum of the detected outputs of ultrasonic Doppler blood flowmeter. The apparatus comprises a digital operating means, a memory means which is connected to said digital operating means to transfer data thereto and receive data therefrom, a fixed instruction generating portion for generating operating code for the digital operating means and addresses for the memory means, a read only memory for storing data of a squaring operation which has address inputs at the bit position selected as most suitable from the input data bus line of said digital operating means, an overflow detecting means when input data exceeds the region of the address input, and digital saturation circuit, whereby the power spectrum can be calculated by fundamental algorithm of WFTA having a smaller number of operating steps than algorithm FFT.

REFERENCES:
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patent: 4225864 (1980-09-01), Lillington
patent: 4257278 (1981-03-01), Papadofrangakis et al.
patent: 4265126 (1981-05-01), Papadofrangakis et al.
patent: 4393457 (1983-07-01), New
Godbole et al, "Realtime Spectrum Analysis Using a Microprocessor Peripheral"; Conference ICASSP 81, IEEE International Conf. on Acoustics Speech and Signal Processing, pp. 654-657, Mar. 30-Apr. 1, 1981.
Chwastyk; "A Fast Digital Spectral Analyzer"; IEEE Trans. on Instrumentation and Measurement; vol. IM-20, No. 4, pp. 198-201, Nov. 1971.

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