【 Weak current College 】 audio equipment using and tuning basis---Power By 【 China power house network 】

Audio equipment using and tuning Foundation
Audio equipment for use on safe use of sound equipment? this article here provides some useful recommendations for your reference: 1. takes note of the machine's working conditions: the general instruction of the machine are listed in the conditions of use of the machine, specifically, is required: 1. avoid temperature very low or very high environment machine, avoiding the direct rays of sunlight has the surface of the machine. 2. avoid damp environment using the machine in order to avoid premature failure within components or machine premature rusting. 3. use the front must confirm the local supply voltage corresponds with the machine. 2. takes note of the machine's use of the environment: 1. avoid dust and vibration environment using the machine. 2. in the machine's surroundings should leave enough empty space to facilitate heat dissipation of the machine. 3. for power amplifier, should pay special attention to maintain cooling channel flow. 3. machine-use note: 1. in the audio system, you should be aware of the power-on, shutdown sequence. Power-on, you should first open sources, open in front of the device, and then power amplifiers; shutdown, you should close the power amplifier, and then close the audio sources, and other leading devices. Audio equipment if the volume knob, power on, power off before the volume knob off to a minimum. The aim is to reduce the power on, power off the impact of the speaker. 2. pull the plug is charged, plug the signal. Avoid the resulting shocks and damage to machines or speakers. 3. the machine to work if making an abnormal sound, immediately turn off the power to stop using. And please experienced qualified maintenance personnel maintenance. Its not on the machine, so the machines suffer more damage or cause electric shock accident. 4. takes note of the maintenance of the machine: 1. do not use volatile solvent-cleaning machines, such as gasoline, alcohol, etc, wipe the surface of the machine, dust with a soft cloth. But when the clean machine Shell to unplug the power supply. 2. the machine is generally not waterproof, water in case of wet, wipe with a dry cloth, and water stains dry before startup work. 3. do not place heavy objects on the machine to machine. 5. safe use of the machine: 1. never wet hands pulling, plug in the power plug to avoid electric shock. 2. long term when not in use, move the power plug from the power supply. 3. do not let the iron pins, clips, coins and other metal conductive material falling into the tank, so as not to damage the machine. 4. replace the fuse of the machine, you should strictly follow the requirements change, is strictly prohibited the use of non-requirement of substitutes. 5. machine in use, should be the case then place safety grounding. 6. the machine is strictly prohibited in the case of overload or short-circuit. 7. a General in the civil power amplifier on the back panel has an auxiliary power outlet, not through its connection, hair dryer, iron, electric appliances, it can only be used to connect to the audio device.
8. at constant pressure power amplifier, its output will have a high output voltage and the output pin is generally longer, therefore in use, it is important to ensure that the output pin of the safe and reliable. 6. Note the power line protection: 1. to avoid the power cord is treading, was a heavy squeeze. 2. do not pull the plug and brute force perverted, and power cords. 3. pull the plug from the socket, you should seize the plug and unplug it. In short, modern audio equipment is a high-tech products, be sure to carefully maintained, safe use, and correct operation. For beauty, and avoid unexpected losses tuning tips for getting started on the timbre of a human ear is relatively sensitive feeling, it can directly discriminant sound is realistic. If the sound processing is not good, not only will it make a sound monotonous, boring, but also people will make a musical instrument or singing have serious distortion, so sound processing cannot be ignored. For men, the majority of low, missing sound treble, to improve the clarity of the singing, generally on how often the very conduct 3kHz; for girls, high-pitched seems too much again, the sound from the "sharp", to enable sound rolling, not too harsh, generally on the frequency components 400Hz compensation. How to adjust the sound reverberation time reverb usually determines the length of the sound, the sound of color and clarity have direct effect. In General, bass singing, the reverberation time is shorter transfer to enhance audio clarity; if is the soprano singing, may be appropriate to extend the reverberation time in order to increase the sound of color. For concert venues, if the room surrounding wall is made of wooden material, then you should adjust the reverb time, so as not to sound less blurred; on the other hand, if the room surrounding wall is formed by wood materials, the reverberation time should be smaller to name free sound blurred; on the other hand, if the room with velvet curtains and other sound-absorbing materials, this room reverberation time should be adjusted so as not to interfere, with the sound. In addition, the audience and the size of the audience also has a significant impact, because the audience's clothing also has a lot of sound-absorbing effect. Therefore, the audio Division, the tuner can be in 1 ~ 2 seconds to select a feeling fit the reverberation time. How to adjust better to mix sound and noise components of the proportion of direct sound completely without mixing sound output, you will not be able to play in improving and enhancing the role of the voice, which is usually only used for the meeting to speak or read. Appropriately increase the percentage of mixed sound compositions, to simulate natural mixed sound, the sound of fullness, to increase the audience, just the icing on the scene. Fully mixed noise without direct sound component output, you can make the sound produce "dyeing" phenomenon, cause serious distortion, that is, as in the bathroom, the bath-house to hear voices that vague, in that its effect for the "bathroom". Therefore, no special requirements, you can apply this knob in the center position, i.e. direct sound component and mixed noise component ratio is 1: 1, so that the sound will not cause distortion, and there is a reverb effect. How to adjust the microphone volume and good music in proportion to the accompaniment of a good song, should be accompanied by music and 40%, 60% of the singing voice, if the singer sound good, may be appropriate to reduce the number of components, the accompaniment of music to prominent singersSinging; if the singer on the song by Melody is not familiar, easy to sing out of tune, is taken on, in order to cover up these shortcomings, this may be appropriate to increase the number of accompanying music. But how to do this, you should be careful not to put the microphone volume too much larger, much less vocal volume level significantly higher than the accompaniment of music. The result is too weak, the accompaniment of music most of the time only hear the singer's voice, like the one in there for this moment, lost karaoke atmosphere; but you can't let the accompaniment of the audio sound is too strong, too strong, and will "drown" the singer of the song that sounds like a band playing music, experience not the singer.
How to adjust the pitch of the sound accompaniment music accompaniment music is based on the original singing ' tone and increase performance, it is not adapted to each of the singers of noise conditions, such as some original singing ' range is relatively high, with original songs were sung by the tempo is relatively low, in order to be able to let the accompaniment music catering to every singer of noise, sound engineer, tuner with the singer's voice features a sensitive auditory reaction. Singing, the first tone control is placed in the center position, since it does not raise or lower. A start, if the singer-have raised, and that you do not have to go to regulation; on the contrary, the singer who is the bass area can't sing, or treble zone behind, according to the actual situation will transfer the pitch adjustment to the singer to adapt tempo. Tuning is an artistic strong operational processes, it needs to be tuned to have very good sense and understanding, needs usually have higher musical education, on the scene to have sensitive auditory reaction, so adjust sound in order to be accepted by the audience. -Operation of the current domestic yinyuan dance hall used for professional audio, the majority of imported equipment, it should be said that the high reliability. The main problem is the operator's professional-quality, genuine with eligible tuner unit is very small. Therefore, often due to improper operation caused poor acoustics, or even cause damage to the equipment. This article is targeted at small and medium-sized dance hall audio equipment operating points, can be used as a reference for practice. In addition, in small and medium-sized dance halls as microphone acoustic feedback caused by the phenomenon of self-excited Whistler, is common to use a headache, because frequent Whistler will make guests ' disappointing, sound effects whatsoever, in severe cases, can cause damage to the equipment. Therefore, the phenomenon of self-excited screech is singing the sound use of an important issue, described below. First, the sound equipment on, shutdown order should follow the order by the former to back up, i.e. the audio source device (CD, LD, DVD players, recorders, recorders), audio processing equipment (compressors, Exciter, effects, divider, equalizer, etc) to the audio power amplifiers to the TV, projector, monitor. Shuts down in reverse order, you should close the power amplifier. This action prevents open, shutting down the impact of the device to prevent burning power amplifier and speakers. II. preparation before singing--debug 1. amplifier's volume control potentiometers are transferred to the Max position; on the accompaniment of music and sound mixer handset tap faders should be placed on the 0dB; mixer tap GAIN input gain are placed in a location is fine; the total volume of the mixing console Fader start at minimum position (lower); mixer sound compensation knob is placed in the middle position. 2. test accompaniment channel, that is, use the CD disk or LD coiled songs music, the sound mixer anxious-jump man enjoyed Clay's son, near the border to-6dB, songs and accompanying music is typical of the volume; but it is necessary to pay attention to the volume you want to spend pleasant, moderately large easy sound that fatigue and unbearable. -Should the Hall Yinyuan different position to listen to the result. If stereo quality sound and video, music, etc. The tracks should be your own familiar songs, adjust volume can be repeated (adjustment tap GAIN gain) and tap tone compensation until the sound is satisfied. At the request of the music should be aggressive, beauty, treble not shrill, bass cannot clear cloudy, requirements, such as the female voice of tooth sound clearly audible, but not too heavy. Tap faders at 0dB, total volume faders at 0dB, regulating tap GAIN input gain knob makes around 0dB AU table indicates, the system achieves rated output power. But the normal working hours, the total volume faders — like tune in — or — 10dB following 6dB, less than the rated output power. 3. test the microphone channel. In General, at least to prepare two microphone channel. Try the receiver sensitivity and dynamic properties, and then add reverb and accompaniment music singing, singing after the reverberation processing, should be better than the original song sound more mellow, full and there are levels, rich presence.
Microphone volume adjustment: tap faders at 0dB, microphone volume adjustment tap GAIN input gain knob to tap peak led occasionally flashing, total output power measurement by AU table indicates.
4. for small Orchestra Auditions for tuning, that is, to a variety of musical instrument microphone for carrying audio and signal an audition, according to the proportion for reproducing music style. 5. adjust the video image, that is, the projector and TV should adjust its brightness, contrast, color saturation knobs make it clear and colorful images. Sound should be comfortable working with DVD player and karaoke, familiar with the disc on the song list. Note in a formal concert, you should press the DVD player on the D/A key. Inclined original singing sound. 3. audio processing equipment of adjustment 1. room equalizer. Room equalizer has two functions: one is to adjust the sound quality, cover the Hall reverb time cause an imbalance of frequency response; the other a important role in the Suppression of a band, suppression of squealing sound feedback. Room Equalizer should maintain normal sound engineering debugging add decided. 2. press the filter. In audio engineering to press for an important device, its role: to compression or restrictions on the programming of dynamic range, prevent overload or distortion, amplifier and the speakers have a protective effect; another important role is to improve the program loudness (this can be done by hearing clearly have felt). Data compression is adjusted as follows: (1) noise gate GATE: led light noise gate closed sound. Up to squelch function. When the input signal landing to the threshold level begins to shut down, the noise gate General placed between 0PEN-20dB. (2The compression threshold level): decided to start compression THRESHOLD level, usually placed-10 to 0dB, start compression gain reduced GAINREDUOTION (dB) led starts off. Compression ratio RATT0: over 2: 1; action time ATTACK: keep 10ms; release time RELEASE: keep O.3s. 3. reverberator. The current widely used digital reverberator. This class of machine internal curing many different reverb effects to choose from. Adjusting the yinyuan deal with a variety of reverb reverb effect audition, record individually sing there can use, when the tuning may at any time using the keyboard in use. 4. tuning elements (to manipulate sound mixer) 1. arrival transfer work to control indoor yinyuan, tuning should be sniffing za and listen to headphones, listen to the main channel and to listen to the channel. Adjusting the sound should be familiar with listening yinyuan and on-site sound, sound quality adjustment relies heavily on personal hearing. 2. use a compressor, and actuators to increase loudness of the sound and beauty. Actuator adjustments mainly by hearing, you should press the device instruction manual will sound tuned to round the ear. 3. the song with reverb and beautification. On non-professional singer aggravated due to mask the noise, reverberation and audible defect. 4. volume hours that enhance the low frequency and high frequency; the volume increase frequency when appropriate, to enhance the sound of luminance. 5. tuning to singing. When the songs appear before gradually lowering down the accompaniment, to highlight a song. 3-frequency attenuation should — 5dB, high-frequency attenuation 7kHz above should 3dB, near the lift in the low-frequency 200Hz may intensify, 2-3-6dB 4kHz upgrade can be clearly felt the song bright.
Disco or rock music you should pay attention to significantly enhance the low frequency (40 — 100Hz) and high-frequency (7-20KHz).
6. enhance bass is not cool rotation compensation button to avoid the power output is too large to damage the amplifier and the speakers. On the low-frequency adjusting the equalizer also true requirements. 7. If there is a sound feedback whistling cry, should promptly that the yintai total volume faders to remove squealing voice drop down, find out why and then gradually pushed. 8. failure of the main channel is not broadcasting, you can pass back to listen to the speaker of the rotation angle of the temporary substitute for the main channel, the continuation of the singing. For singing with a microphone, should have a backup, when the receiver is available backup instead of silence. Laserdisc player should be backed up when a VCD faulty backup alternative when available. 5. acoustic feedback (whistling sounds) of 1. microphone acoustic feedback whistling of self-excited call is established and Kara 0K Hall of common phenomenon, due to the presence of acoustic feedback, General PA systems gain can be very large. Sound feedback whistling happened because: (1) microphone is too close to loudspeakers, microphone forward links to speaker; (2) mixer adjustment too large on reverberation; (3) microphone volume adjustment is too large; and (4) is not connected to press; (5) acoustic design defects within the Office. 2. for the above reasons can take the following measures: (1) the activities for the singer's stage a scope limited, in this context should not occur having a voice. In other words, the singer should not be too close to the main speaker, Lord speaker response in the wings; the singer of the station should not make the receiver forward links to speaker. (2) of the stars of stage and acoustic treatment should be conducted, should be installed on both sides of the wall and sound-absorbing materials. (3) plug in the compression, the compression ratio should be set to < = 2: 1, action time to 10ms, release time 0.3s. (4) of the regulation on the reverb sound mixer and volume don't drive too large. (5) these measures are ineffective, you can adjust the equalizer, easy to produce screech of frequency attenuation. How to do the following: all the equalizer frequency location to record; then, the model act. Increase the volume (total with mixer faders adjust), the system just produce self-excited, Equalizer on the spin button to start from the low-frequency rates, one by one to the effective elimination of self-excited screech of frequency, based on experience in General only one self-excited oscillation frequency (e.g. 250Hz), near the frequency to drop down 3-5dB, remaining frequency should keep the original records. This method can be effective in inhibiting the acoustic feedback, but it cannot take into account the effect of music. By regulating enables PA gain 5-6dB stability margin, it is necessary to stabilize the system. (6) if the above measures are ineffective, consider adding sound feedback suppressor, for example, move the prescaler can effectively overcome the acoustic feedback, make amplification gain access to 5-6 plus more stable margin on sound color of whatever the human voice, singing, or musical instrument sound, they are not a tone, which is a composite codes. By voice pitch and a series of overtone.
These harmonics are pitch frequency of bits, called physics, electro-acoustics partials is called harmonic overtone, the music is called. It has the characteristics of the sound is very important. The number and these overtone harmonics amplitude differences constitute timbre chong's frequency characteristic curve. This curve on the body and then the timbre of expressiveness. For example, the lowest audio rate the piano is 27.5Hz, brilliance, and the frequency is 4186Hz piano has a dozen overtone, its high frequency up to 10kHx ~ 20kHz, generally measured 16 overtone or 24 overtone. These harmonics can be divided into low-frequency harmonics, medium and high-frequency harmonics, overtone. If the amplitude of the low-frequency overtone, the tone is strong performance had mixed thickness; the amplitude of frequency harmonics are relatively strong, the tone will be mellow, natural, harmonious; the magnitude of the high-frequency harmonics are relatively strong, the tone will be bright, equipped, and analytical power.
Spectral curve, that is, the tone of the Pan am range of vertices in coordinates, the package path is this morning color spectrum curves. A sound spectrum curves vary, and vocal body material structure, status, and vocal intensity and resonance in different. What is the best tone? according to Italy, and American acoustic point of view is to pitch to page 16 PanSound intensity in the coordinates of a line, this line is known as the best classical lines, the frequency of the tone, which is the characteristic curve of the closer this line, which the tone of low, medium, high-frequency harmonics of most balanced, its timbre of artistic expression is the most decent record. In the voice of beautification, modification, you can enter through mixers in channel four equalizer, frequency of the tone, to improve the tone of artistic expression. In the fourth paragraph of the mixing console Equalizer is divided into four frequency bands, according to the German car: introduction to the music Research Institute in Berlin, they are: HF: 6-effect of timbre 16kHz, expressive power, analytical ability. MIDHF: 600Hz ~ 6kHz, impact sound of luminance, sharpness. MIDHF: 200 ~ 600Hz, impact sound and force chong and sturdy. LF: 20 ~ 200Hz, impact sound of thickness and richness. If high band frequency is too weak, its timbre becomes color, flavor, personality of the lost; if high band frequency is too strong, and the timbre becomes sharp noise, hoarse, harsh. If you have high band frequency, timbre becomes Dim, hazy; if you have high-frequency band of strong, its timbre becomes dull. If the frequency of low frequency band is too weak, and the timbre becomes empty, gravis, soft; if too low-band frequency, and the timbre becomes hard, losing its vitality. If the frequency of low frequency band is too weak, the sound will become thin, pale; if too low-band frequency, and the timbre becomes cloudy. The timbre is rich in beauty, overtone, the songs are level with audio, audience sounds wonderful, easy ascent is too strong. LF (bass), sound cloudy; HF (treble) excessive, vocal noises jangling. After upgrading a band, also work to consider the impact on other frequency bands, singing to overall consideration of the definition and richness. Here's some starter-tuning of the human voice. 1 tune to the host's Chair for Miss, its voice is clear and smooth, expressive. She can affect the mood of the audience, so you want to take her tone tone. Low tone type: whisper, emotions, you can take the short distance pickup microphone is close to the mouth, thus increasing closeness to pick slim, weak tone.
The drawback is there nearly stresses effect, low frequency too strong.
Specific treatment means: (1) to decay LF: 6dB at 100Hz attenuate, near maximum attenuation to 10dB. (2) for MID: 250Hz-2kHz upgrade 3-6dB. 250Hz-2kHz is language important band. (3) for the HF frequency band attenuation above: 6KHz 3-6dB to reduce the high frequency noise. (4) the moderator of the receiver do not use the reverberation effect processors (REV) and echo (ECHO), otherwise you lose the realism and immediacy. 2 on the ordinary people of tuning in the stars, some singing fans and amateur singers, some people are just leaving the entertainment consumers, they are their own songs. Which some people have no basic professional training, lack of singing skills, and even some noise is not good and does not use a microphone, where men prone guttural and Husky, girls prone breath noise and vocal noise. To eliminate these phenomena means following specific processing. (1) in the following resection, 100Hz to eliminate low-frequency noise, enabling a more pure timbre. (2) in a 500-800Hz attenuate to small, making the timbre not too stiff. (3) in the MID band raise 3-6dB to increase luminance, make voice clear and bright; (4) most people sounds are low, and the lack of loudness, so the volume you want to open a large number; or make 200-range frequency to improve 300Hz to increase loudness of the sound. Amateur singers dynamic range is not large, do not use the automatic volume control. 3 the professional singers singing in tune often have a professional singer, is friend invited guests in the stars, sometimes sing two songs to entertain friends and guests. Professional singers have a loud voice from the voice, sigh, diction, resonant vocal has the basic skill level, but everyone has a singing style. Tuning requirements: (1) to understand the characteristics, the singer's voice network, high, medium, low harmonic characteristics; (2) to learn about the singer's vocal range width and wide dynamic range; (3) to the familiar songs, lyrics, emphasised the fundamental approach to early morning and the mood of the song or consistent; (4) it is necessary to pay attention to the style of the song and the singer's vocal emotion; (5) microphone level to high: Broadband ring, small distortion, dynamic. The actor standing in the music world, with a fusion of acoustic field so that its timbre with electro-acoustic, natural sound. So, you'll find excellent acoustic properties. Female: girls in the high frequency part prone S tone (hiss); 7-10KHz attenuate the 3dB, S tone can be eliminated. Male: male vocal range than girls on the sensational low a 8 degrees, frequency low a multiplier, in around 3dB 100Hz attenuate the, you can increase the sharpness.