What Is Audio Processing?

Audio processing is an audio processing device that we often use when using many large electronic devices. It can help us control the music or soundtrack, make it produce different sound effects in different scenes, increase the shock of the music or soundtrack, and Capable of controlling many audio functions in the field.

Audio processor

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Audio processor

For general digital processors, the internal structure is generally composed of input and output parts. The functions of the audio processing part are generally as follows: The input part will generally include input gain control (INPUT GAIN), input equalization (equalization of several segments of parameters) ) Adjustment (INPUT EQ), input terminal delay adjustment (INPUT DELAY), input polarity (that is, the phase we all say) conversion (input polarity) and other functions. And the output part generally has signal input distribution routing (ROUNT), high-pass filter (HPF), low-pass filter (LPF), equalizer (OUTPUT EQ), polarity (polarity), gain (GAIN), delay ( DELAY), limiter start-up level (LIMIT).

Common audio processors can be roughly divided into 4 architectures:

Audio processor determines system connection

The first is to use a processor to connect the system. First determine which output channel is used to control the full-range speaker and which output channel is used to control the subwoofer. For example, you use the output 1-2 channel to control the subwoofer, and the output 3 or 4 channel to control Full frequency. ^[1]

(Wiring is flexibly applied according to the field equipment, such as mixerequalizerprocessormain amplifier, bass amplifierfull range speaker, subwoofer)

After the line is connected, first enter the edit interface of the processor to set it.

The software interface is as follows:

Audio processor selects signal channel

Use the routing function of the processor to determine which input channel the signal of the output channel comes from. For example, if you use stereo mode to amplify the sound, you can choose the signal of output channels 1 and 3 to come from input A, and the output channels 2 and 4. The signal comes from input B.

(Select an output channel Out 1-4 in the software interface, and select at the input source on the right, as shown in the figure below:

Audio processor setting crossover

Set the working frequency band of the speaker according to the technical characteristics or actual requirements of the speaker, that is, set the crossover point. The frequency division module on the processor is generally represented by CROSSOVER or X-OVER (our processor is represented by X-OVER). After entering, there are lower limit frequency selection (HPF) and upper limit frequency selection (LPF). (Ie, Qualcomm and Low-pass); there are also filter modes and slope options. First determine the working frequency band. For example, the subwoofer frequency is 40-120 Hz. You set the HPF of the subwoofer channel to 40 and the LPF to 120. If you want to control the lower limit of a full-range speaker, set its HPF to about 50-100Hz according to its woofer caliber. There are generally three types of processor filter choices, bessel, butterworth, and linky-raily. Butterworth and linky-raily are commonly used, and then the frequency division slope is selected. Generally, you can choose 24dB / oct to meet most applications. Already.

Audio processor check level

At this time you need to check whether the initial level of each channel is at the 0dB position. If they are not 0, first adjust them to the 0 position. This level control is generally in the GAIN function and the DBX processor. The level is inside the frequency divider and is represented by G.

Audio processor sound test

Now you can turn on the signal and let the system sound first.

Then use a polar phase meter to check whether the polarity of the speakers is uniform. If there is any inconsistency, first check whether the wiring is reversed. If the line is not reversed, and the polarity of the full-range speaker and the subwoofer are reversed, you can use the polarity inversion function (polarity or pol) of the output channel of the processor to reverse the polarity of the signal. Generally, Nomal or "+" is used. It indicates positive polarity, and INV or "-" indicates negative polarity. (Ie reverse phase, as shown in the figure)

Audio processor delay processing

Next, we need to measure the transmission time of the full-range speaker and the subwoofer with the help of tools such as SIA. Generally speaking, there is a difference. For example, the transmission time of the full-range speaker is 10ms, and the subwoofer is 18ms. The processor's delay function is used to delay the full frequency so that the transmission time of the full frequency and bass is the same. The delay of the processor is expressed by DELAY or DLY. Some use the distance m (meter) and some use the time MS (millisecond) to display the delay amount. The SIA software also provides the amount of time and distance. You can choose the data you need. Value to delay.

Audio processor equalization adjustment

For the adjustment of the balance, you can use the test tool or the ear to adjust. The balance of the processor is indicated by EQ. How to adjust it depends on product characteristics, room characteristics and subjective hearing.

Audio processor limit adjustment

After the balance is adjusted, you need to set the limiter (that is, the limiter). You can limit the 4 output channels and set the limit level with the power amplifier. After becoming the limiter, the start time and The release time is generally ignored.

Audio processor saves data

After you have adjusted them, you need to save the data. Select Program Management-Save the preset to your computer, or you can recall the preset from your computer for later debugging and use.