Audio processors have been widely used in sound engineering. Audio processors are one of the key devices in the broadcast transmission system, and they have a great impact on the quality of broadcasting. For those who have basics, the processor is a very useful tool, but for some friends who lack experience, looking at a processor is a lot of English, it is inevitable that it is impossible to start. Let's talk to everyone about the rational use of digital audio processors today. Keep the signal undistorted At the front end of the mid-wave broadcast transmitter, the audio signal highly processed by the audio processor will contain many flat-top waveforms similar to square waves. The square wave's waveform requires a relatively high amplitude and phase response to the transmission path it passes through. In principle, in the frequency range of the main energy of the program, if the flat amplitude and the group delay are deviated, the flattened top of the processed audio signal will be tilted, thereby increasing the peak modulation voltage, but the average level is not increased. . From the peak/flat ratio value, the average level of the path is reduced, and the loudness is correspondingly reduced. In this regard, we want to maintain the prototype of the processed signal waveform. The first method adopted is to select a transmission cable with high quality and excellent performance in the use of the transmission signal cable, and to require a distribution parameter small, a frequency bandwidth, a thick copper wire, a small attenuation, and a shielded copper core transmission line. This is very important and very effective. In addition, in the transmission connection, try not to add any additional equipment and branch components, such as intermediate amplifiers, distributors, etc., to reduce signal waveform distortion and ensure good transmission quality. Audio processing system settings 1. For the audio processor, it consists of two circuits, one is a slow moving AGC, and the other is a compressor with moderate motion and recovery time. The optimal time constant is adjusted for each frequency band according to needs. We conclude in actual use that the time constant of the low-frequency band is set to be slower than the high-frequency band (about 200 μs), which has a greater effect on increasing the signal density of the program. 2. The audio processor also adds some auxiliary components in the basic system, and enables the frequency equalization processing component of the audio processor installed between the slow moving AGC and the multi-band compressor to compensate for the typical sound of the medium wave broadcast signal. Frequently audible conditions. Properly increasing the distribution of 600 Hz-1.2 KHz sound energy throughout the audio spectrum makes this sound audibly "larger" (the most sensitive range of human hearing is 2KHz-8KHz). It can make the audience feel the sound is really beautiful. 3. We also use the “Attenuation Distortion†device on the audio processor to provide absolute negative peak control, which prevents the audio signal from overflowing, in order to eliminate some of the frequencies that the listener is most likely to hear. distortion. Audio processor placement In the system, the location where the audio processor is placed is also very particular. In order to effectively protect the peak-limited waveform processed by the audio processor so that it does not change during transmission to the transmitter, the audio should be The processor is placed close to the transmitter and the shorter the distance, the better. In order to avoid the variation of the distribution parameters during the transmission process, the parasitic modulation peak is caused, and the waveform whose peak limit has been processed is changed, resulting in distortion of the waveform of the audio signal. Benefits of the audio processor 1 can solve the problem of large difference in program level caused by 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 created conditions for establishing a volume balance between language programs and music programs. 3 A certain amount of amplification of the weak signal at the low tide of the program can be performed so as not to be submerged by the noise component. 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 as the same power level. After using the audio processor, the sideband wave power is increased, so that the receiving carrier field is slightly lower than the required one. To the higher quality signal, the coverage is expanded. KNB1-100 Miniature Circuit Breaker
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