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By Annaby M.H., Mansour Z.S.

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Photo 1c shows how the demodulated signal faithfully reproduces the DC offset and low-frequency components of the ECG. Because the sound card output is in the audible range, the modulated signal can be transmitted to the demodulator via a voice radio or telephonic link for remote signal generation. To do so, however, the tone frequencies produced by the sound card for a full-scale input must be limited to the band-pass of the communications channel. For a plain telephone line, this range is 400 Hz to 3 kHz, while a commercial FM audio link is specified to cover the 30-Hz to 15-kHz audio bandwidth.

Eightbit samples are stored as unsigned bytes, ranging from 0 to 255. Sixteenbit samples are stored as two’s-complement signed integers, ranging from –32,768 to 32,767. If you’re a Matlab user, you can avoid the hassle of file formatting by directly playing a datastream from within the Matlab environment using the sound command. wav file PCM-encoded signal into data that can be manipulated by Matlab. Another possibility is to use a professional waveform design package, such as the Pragmatic Instruments WaveWorks Pro, to create the desired signal.

Il. Michael Norris is a senior electronics engineer at Impulse Dynamics, where he has developed many cardiac stimulation devices, cardiac contractility sensors, and physiological signal acquisition systems. il. REFERENCES [1] D. Prutchi, “Digital Generation of High-Frequency Waveforms,” Circuit Cellar 84, July 1997. [2] D. Sherman, “Program Turns PC Sound Card into a Function Generator,” EDN, September 2, 1999. htm. 02 David Sherman Engineering Co. htm Matlab MathWorks, Inc. com MAX280 Maxim Integrated Products, Inc.

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A basic analog of a theorem of Polya by Annaby M.H., Mansour Z.S.


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