The mixing console, also known as the tuning console, multi-channel input signal for amplification, mixing, distribution, sound modification and sound effects processing, broadcast and record programs in modern radio broadcasting, stage amplification, audio program production systems, etc. Important equipment. The mixer can be divided into analog mixers and digital mixers according to the signals.
There are differences in the number of input channels, the number of function keys on the panel, and the output instructions of Mixer Mixer. In fact, mastering the use of a mixing console requires an overall examination of it. Natural practice makes perfect use of actual operations and connections. Mixer is divided into three parts: input part, bus part, and output part. The bus section connects the input section and the output section to form the entire mixing console.
Mixer typeAccording to the purpose of use and the use of different, the mixer is divided into the following categories:
(1) Stereo Field Production Console
(2) Recording Console (Recording Console)
(3) Music Console
(4) Digital Routing Mixing Console
(5) Powered Mixer with Power Amplifier
(6) On Air Console
(7) Theatre Console
(8) PA Console
(9) Wired Broadcast Mixer (Wired Broadcast Mixer)
(10) Compact Mixer
The functions shared by the mixer are: signal amplification and impedance matching, signal processing and processing, signal mixing and distribution. However, the functions and working methods of different types of mixers are slightly different. For audio and recording professionals, only the production of portable mixers will be described in detail below.
The portable mixer processes the signals in such a way that each microphone is connected to a channel preamplifier. Different microphones are matched to the gain of the preamplifier and the padding attenuator because different microphones have different sensitivities and different dynamic ranges (some microphones can reproduce higher sound pressure levels than other types of microphones. Distortion) The position of the pickup is different, and the sound picked up by the microphone is different.
The technical specifications of the mixer include: equivalent input noise and signal-to-noise ratio, frequency response, nonlinear distortion, headroom, and crosstalk.
What is an exciterThe exciter is a harmonic generator that uses human psychoacoustic characteristics to modify and beautify sound signals. By adding a high-frequency harmonic component to the sound and other methods, it is possible to improve the sound quality and the timbre, increase the penetration of the sound, and increase the spatial feeling of the sound. Modern stimulators can not only create high-frequency harmonics, but also have functions such as low-frequency extension and musical style, which makes bass more perfect and music more expressive.
Actuator working principleThe basic principle of the exciter is to send the high-frequency band of the audio signal to the harmonic generator after selection and create the high-frequency harmonic of the frequency and add it to the original audio signal to strengthen the original audio signal. Harmonic components in the FM region to improve overtone structure.
The exciter is mainly composed of two parts: the direct channel of the audio signal and the excitation channel of the excitation channel. The working process of the exciter is as follows: the audio signal input to the exciter is sent to two channels, respectively, and a direct signal is obtained through the delay line. The direct signal is not subjected to harmonic processing, and the frequency characteristic of the audio input signal is retained; The other part of the audio signal is then subjected to a “harmonic excitation†circuit formed by an adjustable high-pass filter and a harmonic signal generator to generate a rich, adjustable harmonic signal (ie harmonic), which is then superimposed with the direct signal; The road superimposed signal is finally output by the signal mixing amplifier.
The tunable high-pass filter is used to filter out low-frequency components in the audio signal. At the corner frequency, it has a slope characteristic of about 12 dB/oct, and the corner frequency is adjustable so that it can be applied to certain frequencies within the frequency range of the processing signal. .
The first method imitates the connection of the effector and receives the input of the exciter from the EFFECT (or AUX) output of the mixing console. The output of the exciter is connected to the input of the channel of the mixer.
The second method is concatenated in a channel that requires an exciter and inputs and outputs from the INSERT jack.
The third method is directly in series with the audio equipment, usually immediately after the output of the mixer. The first method is easy to operate, but it needs to occupy one input channel. It is better to use the sound reinforcement system above medium-sized.
Summary: The second method is used for more demanding occasions, and sometimes more than one exciter may be used; the third method is used in a relatively simple small system. These methods are self-selected translations according to site conditions.
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