Audio devices in security devices have increased the use of audio processors, which not only have reduced peak levels, but also increase the average modulation, and can also increase the sideband power to increase the loudness.
In addition to this, there are four better effects:
1. It can solve the problem that the program level difference is large due to recording, exchange, different program content and using different recording and playback devices, which is difficult to solve manually when manually adjusting the program level.
2. Create conditions for establishing a volume balance between language programs and music programs.
3, can be a certain amount of amplification of the weak signal when the program is low tide, so that it is not submerged by the noise components. Usually, the level of the treble component in the program is low, and after processing, the amount can be improved. The high-frequency component not only determines the clarity of the program, but also has a mental and physiological complex relationship with the loudness, due to the clarity. Improve, so that the audience feels louder.
4. Stereo broadcast, which covers half of the mono broadcast with the same power level. After using the audio processor, the sideband wave power is increased, so that the receiving carrier field strength is slightly lower than the required one. It may receive higher quality signals and expand coverage.
The processed music is 8.2dB higher than the average power of the music before processing. Compared with the normal limit of 15dB compression, the obtained value is 5.9dB, which is actually equal to 4 times the transmission power. Using an audio processor to increase coverage can save a lot of power, equipment investment and maintenance costs compared to other methods, which is a very economically viable method. Of course, the audio processor should compress the content of the program in an appropriate amount. Excessive compression will damage the content of the program, affecting the artistic effect of the music, and the stereo broadcast will lose its proper characteristics.
In summary, at the program input end of the transmitter, a high-quality audio processor should be used to compress the dynamic range of the program, increase the loudness, expand the program coverage, and ensure high-quality stereo broadcast. As far as the current technical level of the audio processor is concerned, it can fully meet the requirements of high-fidelity broadcasting, so that the processed sound can not hear the processing sound, that is, the original sound is still preserved without processing traces. The quality is even more pleasant, clear and beautiful than the original sound.
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