谈音质标准与音质评价方法（Talking about sound quality standard and sound quality evaluation method）.docVIP

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谈音质标准与音质评价方法（Talking about sound quality standard and sound quality evaluation method）.doc

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谈音质标准与音质评价方法（Talking about sound quality standard and sound quality evaluation method）

谈音质标准与音质评价方法（Talking about sound quality standard and sound quality evaluation method） In addition to the frequency range, people often use other methods and indicators to further describe the quality standards for different purposes. Quality standard The quality of sound refers to the fidelity of an audio signal transmitted and processed. At present, the sound quality standard recognized industry is divided into 4 levels, namely the digital CD quality of CD-DA, the signal bandwidth is 10Hz~20kHz; FM radio FM, the signal bandwidth is 20Hz~15kHz; broadcast quality of AM, the signal bandwidth is 50Hz~7kHz; the voice quality of the telephone, the signal bandwidth is 200Hz~3400Hz. Visible, digital CD sound quality is highest, the lowest quality voice calls. In addition to the frequency range, people often use other methods and indicators to further describe the quality standards for different purposes. For analog audio, the more frequency components are reproduced, the less distortion and interference, and the higher fidelity of sound, the better the sound quality. For example, in communications science, the quality of sound is measured in terms of frequency, range, and signal to noise ratio, as well as the frequency range of the audio signal. For digital audio, the more components of the audio frequency, the smaller the bit error rate, the better the sound quality. Usually with the digital rate (or storage capacity) to measure, the higher the sampling frequency, the greater the number of quantization bits, the number of channels, the greater the storage capacity, of course, fidelity is high, the sound quality is good. Different types of sound features, the quality requirements are not the same. For example, voice quality fidelity is mainly reflected in the clear, without distortion, planar acoustic image; tone fidelity requirements higher, to create space for sound image is mainly reflected in the analog stereo surround sound with multi channel, dual channel 3D or virt