Abstract
AbstractIn the PCM sound broadcast by digital transmission, the noise due to the bit‐error at low reception field intensity degrades the speech quality, which restricts the range of broadcast reception. A method to reduce the bit‐error noise is the error control by range transmission, where the information indicating the range of the significant bit in the sample in a specified interval is transmitted as the range data. This paper presents a quantitative analysis for the reduction of the bit‐error noise, for the traditional range transmission system and the control system by majority decision, to fully utilize the merit of the method. The improvement from the viewpoint of listening sensation was verified by a subjective evaluation test. It is shown that the proposed method exhibits a remarkable improvement in the low‐intensity reception with a high error‐rate, where the error‐correcting code cannot achieve a sufficient improvement. It is shown by experiment that seven levels of the transmission range are sufficient to achieve the desired performance.
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