ＦＭ放送のマルチパスひずみと受信品質

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  • Multipath Distortion and the Received Quality in Frequency-Modulation Sound Broadcasting
  • FM ホウソウ ノ マルチパス ヒズミ ト ジュシン ヒンシツ

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Laboratory simulation concerning the influence of multipath transmission on stereophonic FM sound broadcasting was carried out. It consists of subjective listening tests and measurement of distortion.<BR>The relation between the distortion expressed in percent and the received sound quality was investigated, and by appropriately selecting the modulation condition of a pure tone modulation signal for the measurement, strong correlation was obtained between the above distortion and quality. Therefore, the received quality can be got hold of quantitatively by the measured distortion with comparatively small dispersion.<BR>From the above relation, a practical method to estimate the degradation of the quality is suggested, and the necessary DU ratio to secure the quality over just perceptible or permissible limit has been derived as a function of delay time.

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