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Guangzhou Maranse Electronic Technology Co., Ltd.

Sound equipment knowledges

Time:2019-06-14|

Reading Volume:1092|

Source:admin SmallMediumLarge

(1) Composition of sound system Source A. Microphone Cannon head or straight plug. Directivity, sensitivity and sound quality. Noise introduction. CD, card holder, hard disk player lotus head, Canon head. B. Audio synthesizer Cannon head or straight plug. C. Instruments USB cable or plug. D. Computer USB cable or plug, lotus head.
Text label:Sound equipment knowledges
(1) Composition of sound system
Source
A. Microphone
Cannon head or straight plug. Directivity, sensitivity and sound quality. Noise introduction.
CD, card holder, hard disk player lotus head, Canon head.
B. Audio synthesizer
Cannon head or straight plug.
C. Instruments
USB cable or plug.
D. Computer
USB cable or plug, lotus head.

II. Control Center
A. Mixer
Fixed Path Input Signal Processing (Input Level, Phase, 3-Section Equalization Adjustment, Monitoring Button, etc.)
Fixed Path Output Signal Processing (Main Output, Marshalling Output, Auxiliary Output, Matrix Output)
B. Audio Matrix
Integrated signal input and output processing equipment. (Processing signal input and output path, level, frequency division, compression, phase, delay and other functions)
III. Peripheral Adjustment Equipment Xi'an Audio Equipment
A. Noise Gate
Eliminate electrical noise from outside or inside the audio system. Threshold value, start-up time, compression ratio.
B. Compressor
Mediate the input signal to output the signal in a controllable range. Start threshold, compression ratio, start time, release time, level value.
C. Equilibrium
Sound range can be divided according to frequency points, and audio response can be enhanced or suppressed according to frequency points.  Graphic equalization (15, 31). Parametric equalization (frequency point, Q value, level value, 5, 10 segments).
D. Delayer
Processing the signal according to the channel, correcting the time difference of the final loudspeaker sound signal, and unifying the sound field. (Sound 340 meters per second)
E. Controller
Audio signal is divided into frequency, phase, input and output allocation, parameter balancing adjustment, output compression and other functions.
F. Effector
Acquisition of voice, simulation of reverberation, echo and other effects through the DSP effect chip, and then integrated into the original sound output.
IV. Power Amplifier
A. Impedance
The resistance characteristic of the power amplifier with a certain degree of stability when it is output with load.
B. Power
The actual output energy of the power amplifier under certain impedance.
C. Connection
Three kinds of connection, ST (stereo), PA (mono channel), BR (bridge)
D. Grounding Switch
Whether the signal is grounded and the background noise of the signal is adjusted.
Input response level selection (0.7V, 1.4V) selection.
V. Horn
A. Impedance
The constant resistance characteristic determined by the horn coil.
B. Power
The energy that the horn can accept and convert under its own impedance characteristics.
C, paper basin, coil, magnet steel
Copper wires are wound in a circle to form an electrified electric field, which is suspended and inserted into the slit of the magnetic base. When the current flows through the coil, electromagnetic conversion is formed, which promotes the vibration of the paper basin.
D. The power reserve ratio of power amplifier to horn is 1.5:1. It is easy to damage the unit when small power amplifier pushes loudspeaker.
(2) Audio evaluation index
1. Sound pressure level SPL
Calculated in DB units. Generally, the maximum sound pressure level of KTV is about 100 db. The sound pressure level of disco is about 110 db.
2. Phase PHASE
If the two speakers have the same phase, the sound energy will be superimposed, and if the phase is opposite, the sound energy will be cancelled.
3. Dynamic Dynamics
The span of sound pressure level from the lowest sound pressure to the highest sound pressure. Relatively speaking, the higher the better.
4. Frequency curve
The continuity of sound response at different frequencies can be expressed by a curve. The smoother the curve is, the better the sound response is.
5. Frequency response
The response of a single frequency point to sound is related to site sound conditions, audio equipment and loudspeakers.
Concave, up-warp, scream.
6. Distortion
The difference of frequency response between input signal, output signal and meta-signal.
Audio debugging experience
7. Signal range
The input signal intake level is adjusted to a peak value near 0 db. The output signal is adjusted to 0 db.
8. Phase Unification
Attention should be paid to signal line welding 1 shield, 2 signal hot end and 3 signal cold end. The positive and negative end of the speaker line can not be connected to the negative end. If there is equipment inversion, the inversion line (2 hot - 3 cold) should be connected.
9. Dynamic protection
Compressor startup threshold is about - 2 - 0 dB for treble, about - 1 - 0 dB for baritone, about 0 dB for bass and about 0 - 4 dB for ultra-low frequency.
10. Sound Quality Compensation

2019-06-14 1092People Browsing
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