Many live tuners don't care about the relationship between audio and wavelength. In fact, this is very important: audio and wavelength are directly related to the speed of the sound. At an altitude of air pressure, at a temperature of 21 degrees Celsius, the sound speed is 344m / s, and I contact domestic tuner, their usual sound speed is 34Om / s, this is the speed of the sound at 15 degrees Celsius, but The main thing to remember is that the speed of the sound changes with the air temperature and air pressure. The lower the temperature, the higher the molecular density in the air, so the speed of the sound will decrease, and if it is done at a high altitude. Sound, because the air pressure is reduced, the molecules in the air become scarce, and the sound speed increases. The relationship between audio and wavelength and sound is: wavelength = sound speed / frequency; λ = v / f, if the sound speed is assumed to be 344 m / s, the wavelength of 100Hz audio is 3.44 m, the wavelength of 1000hz (ie lkHz) It is 34.4 cm, and a 20 kHz audio wavelength is 1.7 cm.
The difference between the maximum sound pressure level of the dynamic range audio equipment and the identifiable minimum sound pressure level. The maximum sound pressure level of the device is limited by factors such as signal distortion, overheating or damage, so it is the maximum undistorted sound that the system can emit. The lower limit of the sound pressure level depends on the background conditions such as ambient noise, thermal noise, and electrical noise, so it is the smallest sound that can be heard. The larger the dynamic range is, the less the strong sound signal will be subjected to the overload distortion, and the strong sound can be guaranteed to have sufficient shock power, and the sound effect can be prosperous when the sound effects such as lightning and the like are greatly changed. At the same time, the weak signal The sound is not overwhelmed by all kinds of noise, making the delicate details appear to the fullest. In general, the dynamic range of a high-fidelity audio system should be greater than 90 decibels, and the music that is restored in too small is not effective enough and has insufficient appeal. In the adjustment process of the professional audio system, the sound engineer should focus on the following two aspects when tuning: First, the input gain of the mixer should not be adjusted too small, otherwise the weak sound will be the device noise of the mixer. Submerged. Second, the threshold and compression ratio adjustment of the compressor should be extraordinarily cautious. If the threshold is too small and the compression ratio is too large, the dynamic compression of the sound will be severe. Therefore, the dynamic loss of the sound should be minimized under the premise of ensuring the effect. In addition, there is also a dynamic range in the amplifying circuit and the sound source, and the difference between the smallest signal that can be resolved and the maximum undistorted signal that can be reached.
In the case where the phase difference between the two opposite sound signals is 180 degrees, the opposite direction of vibration between the speaker or the microphone under the control of the same sound is also inverted. The sound system has the left and right channels, the reverse phase, the real phase (that is, the phase between the input signal and the output signal), the phase inversion between the microphones, and the phase inversion of some of the speakers in the array. . Inversion can cause acoustic shorts (ie, the sounds cancel each other out, the volume is reduced), the sound image loses its position, and the bass is turbid, causing damage to the reproduced sound.
The unit of measurement of decibel electric power gain and sound intensity is named by one tenth of the unit bell. Each doubling of power is increased by 3 decibels, and each additional lo times is increased by 10 decibels.
An effect of the Haas effect dual source system. When one of the two sources has a delay time of 5 to 35 milliseconds, the listener feels that the sound comes from the first arriving sound source, and the other sound source seems to be does not exist. If the delay is . Up to 5 milliseconds, the sound is gradually shifted to the first speaker; if the delay is 30 to 50 milliseconds, then there is a lag source. The Haier-style speaker is named after the inventor’s name in the name of Dr. Muir of the United States. It was introduced in 1973 and folded the diaphragm into a pleat. The diaphragm is not vibrating back and forth, but is radiated like a bellows bellows. Vibration in the transverse direction is a special structure of the electric speaker, mainly used for high frequency.
The Lloyd's effect is a èµ (false) stereo effect. After delaying the signal and superimposing it on the direct sound signal, it will immediately produce a clear spatial impression. The sound seems to come from all directions, and the listener is placed in the band. Feelings.
Intermodulation distortion refers to a kind of signal distortion in which a single audio signal whose amplitude is mixed by a certain ratio (usually 4:1) passes through a playback device to generate a new frequency component, which belongs to a kind of nonlinear distortion, and the new frequency component includes The sum and beat of the harmonics of the two single audio signals and their various combinations.
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