Low Distortion FM Demodulator Using Surface Acoustic Wave Delay Device

Minoru TODA; Susumu OSAKA; Kazuo FUKAZAWA; Akira YAMADA

Low Distortion FM Demodulator Using Surface Acoustic Wave Delay Device

Minoru TODA, Susumu OSAKA, Kazuo FUKAZAWA, Akira YAMADA

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Detailed investigation has been made of a surface acoustic wave FM demodulator in which the phase difference between the input and output signals of a SAW delay device is detected. Total harmonic distortion of the audio output signal is measured to be 0.05%, a value comparable with best commercial practice with demodulators operating at a frequency deviation of 75 KHz with a center frequency of 10.7 MHz. Distortion mainly consists of evenorder harmonic components which are less objectionable to a listener than the odd-order harmonic components found in conventional high quality FM demodulators. Analysis shows that the distortion can be reduced reducing both the amplitude of the SAW spurious signals and the delay time difference between the spurious and main delay signals. The spurious SAW signals of concern included those from direct feed-through, triple-transit echoes, bulk waves, and edge reflections. Techniques for reducing or eliminating these are described. Calculated results are in fairly good agreement with experiment.

Publication: IEICE TRANSACTIONS on transactions Vol.E61-E No.2 pp.59-64

Publication Date: 1978/02/25

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Type of Manuscript: PAPER

Category: Acoustics and Ultrasonics

Authors

Minoru TODA
Susumu OSAKA
Kazuo FUKAZAWA
Akira YAMADA

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Minoru TODA, Susumu OSAKA, Kazuo FUKAZAWA, Akira YAMADA, "Low Distortion FM Demodulator Using Surface Acoustic Wave Delay Device" in IEICE TRANSACTIONS on transactions, vol. E61-E, no. 2, pp. 59-64, February 1978, doi: .
Abstract: Detailed investigation has been made of a surface acoustic wave FM demodulator in which the phase difference between the input and output signals of a SAW delay device is detected. Total harmonic distortion of the audio output signal is measured to be 0.05%, a value comparable with best commercial practice with demodulators operating at a frequency deviation of 75 KHz with a center frequency of 10.7 MHz. Distortion mainly consists of evenorder harmonic components which are less objectionable to a listener than the odd-order harmonic components found in conventional high quality FM demodulators. Analysis shows that the distortion can be reduced reducing both the amplitude of the SAW spurious signals and the delay time difference between the spurious and main delay signals. The spurious SAW signals of concern included those from direct feed-through, triple-transit echoes, bulk waves, and edge reflections. Techniques for reducing or eliminating these are described. Calculated results are in fairly good agreement with experiment.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e61-e_2_59/_p

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@ARTICLE{e61-e_2_59,
author={Minoru TODA, Susumu OSAKA, Kazuo FUKAZAWA, Akira YAMADA, },
journal={IEICE TRANSACTIONS on transactions},
title={Low Distortion FM Demodulator Using Surface Acoustic Wave Delay Device},
year={1978},
volume={E61-E},
number={2},
pages={59-64},
abstract={Detailed investigation has been made of a surface acoustic wave FM demodulator in which the phase difference between the input and output signals of a SAW delay device is detected. Total harmonic distortion of the audio output signal is measured to be 0.05%, a value comparable with best commercial practice with demodulators operating at a frequency deviation of 75 KHz with a center frequency of 10.7 MHz. Distortion mainly consists of evenorder harmonic components which are less objectionable to a listener than the odd-order harmonic components found in conventional high quality FM demodulators. Analysis shows that the distortion can be reduced reducing both the amplitude of the SAW spurious signals and the delay time difference between the spurious and main delay signals. The spurious SAW signals of concern included those from direct feed-through, triple-transit echoes, bulk waves, and edge reflections. Techniques for reducing or eliminating these are described. Calculated results are in fairly good agreement with experiment.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - Low Distortion FM Demodulator Using Surface Acoustic Wave Delay Device
T2 - IEICE TRANSACTIONS on transactions
SP - 59
EP - 64
AU - Minoru TODA
AU - Susumu OSAKA
AU - Kazuo FUKAZAWA
AU - Akira YAMADA
PY - 1978
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E61-E
IS - 2
JA - IEICE TRANSACTIONS on transactions
Y1 - February 1978
AB - Detailed investigation has been made of a surface acoustic wave FM demodulator in which the phase difference between the input and output signals of a SAW delay device is detected. Total harmonic distortion of the audio output signal is measured to be 0.05%, a value comparable with best commercial practice with demodulators operating at a frequency deviation of 75 KHz with a center frequency of 10.7 MHz. Distortion mainly consists of evenorder harmonic components which are less objectionable to a listener than the odd-order harmonic components found in conventional high quality FM demodulators. Analysis shows that the distortion can be reduced reducing both the amplitude of the SAW spurious signals and the delay time difference between the spurious and main delay signals. The spurious SAW signals of concern included those from direct feed-through, triple-transit echoes, bulk waves, and edge reflections. Techniques for reducing or eliminating these are described. Calculated results are in fairly good agreement with experiment.
ER -