【 Weak current College 】 sound system debugging steps

Device debugging project

1. the importance of the device debugging

After the previous project a series of planning, design, selection and construction, it can be said that a project has formed the basic profile, various system has also been constituted, or even most devices now available, but professional audio engineering and other engineering different places there is also a, this is the system device debugging. Only through scientific and reasonable debugging system, they can adapt to different environments, fully corresponding capability, coordinated, long-term guarantee normal and stable work. Can this metaphor, not rigorously debugging system, it's all devices like no trained troops, order, Act always in a State of disorder, the level is very low. The importance of strict debugging reflected in addition to direct and give full play to the system's various properties, another important problems: strictly regulate the debugging can make equipment accurately in optimal working condition, plus the use of the later note maintenance, equipment service life can be extended considerably. Practical experience and research show that in the normal range of damaged device, the vast majority are due to improper device debugging and maintenance, and in a large number of projects, the actual maximum capacity, conditions, and debugging experience is the engineering design, construction units, engineering equipment commissioning work was important.

2. the device debugging steps

Professional sound engineering of all system including the type and number of devices is more, the use of various equipment and systems work patterns are different, so the system's device debugging also differ, however, because project types also vary, if you want to work on all types of equipment debugging methods are described, is a bit length is too long, so we here only on late General types of engineering equipment debugging steps for some explanation.

First of all is getting ready for debugging. Sound engineering for debugging is a necessary skill and experience, but it also needs a serious and responsible for the work of the spirit, when the design, selection, layout, and construction will comply with the requirements, the equipment and system testing is to achieve the only means of design requirements, so when debugging to make adequate preparations. These preparations include: preparing the necessary instruments and tools, for example, audio debugging needs phase detector, noise generator, Spectrum Analyzer, sound level meter, Multimeter, etc.; prepared all engineering design and construction drawings; carefully read all the installation and use instructions, and the important or special equipment, usage manual ready reserve; and then there is a need to prepare, debugging work before you start make sure that no unrelated persons, prevent debugging work disruption.

Secondly, in accordance with the design and layout requirements check equipment installation, connection. And works in steps, in the device debugging stage system and equipment installation and connection of the inspection of the whole system of thinking to outlines, and purpose is to find problems, but also easy to find, so check before debugging is necessary; at the same time check the construction personnel asked in construction are legacy issues, convinced that the power supply line and voltage without any problems.

In addition to all the devices in the appropriate setting. Because the composition of the system equipment, equipment, work environment, the system of signal processing, transport, differently, so the set of significance in, making the device works in a reasonable State, makes coordination between devices, the control has a good foundation. Audio system set includes: all equipment with voltage rail to set to supply voltage, and as high a stall; system of signal transmission level values to set consistent signal transmission base reference point to the same power amplifier for operation is stereo, parallel mono or bridge Mono, protection status set to no, the choice of input transformer; speaker of the crossover way, high-frequency attenuation location where; the signal input attenuation of the sound mixer, signal marshalling; peripheral equipment of stalls, bypass chosen, whether the linkage, whether to activate, and so on. Lighting system set includes: all equipment operating voltage and signal voltage setting; specific control devices for the control of the lighting model; digital signal transmission, signal encoding format set to receive the device address coding; dimming platform all lamps or action of the light path location OK, intelligent lights on the function keys set, etc. Video system set includes: all equipment operating voltage; signal color standard setting, monitoring devices and white balance, image illumination; projector signal reception mode choice, projection, display mode, the size of the selection, three color overlay effect settings, and so on. In short, the works in the various systems of the device is a very important work, the want to double check them carefully and, if necessary, to read the corresponding instructions.

The following is on the individual devices in the system separately run the check. This is the significance of the work lies in the fact that, from a separate device running a check, we can gradually check signal transmission, check the device status, of work alone as the system is working to achieve a better sound, light, image quality. Particular sound system equipment, devices and close relationship, a separate device running can focus on the signal's level, gain, phase equilibrium, and smooth to compare detailed, accurate and targeted setting, ensure that the front-stage equipment to provide the best results in lower level of the signal, and ultimately makes the system in good condition; at the same time, a separate device running a check of significance is that separate device running a special can clearly know that all devices work properly and that it is stable, if there is failure, handling more convenient, also does not compromise the security of the system for other devices, so this step must be carefully, patience, it is best not to put the work into in a later step. Note: sound system equipment separate run better not be amplifier and other devices in the system while at the same time open to avoid damage due to failureBad power amplifier and speakers.

Then you can set the system to all relevant equipment used for debugging the system as a whole. As a result of this work is the key to the system debugging, we divided into audio, lighting and video to explain.

Sound system debugging.

1. the power amplifier and speaker system, turn devices one by one, until they are stable, the access phase meter, in a smaller volume, check the phase of all speakers are correct.

II. the noise generator and Equalizer access system, Spectrum Analyzer, prepared in accordance with the relevant State auditoria quality test requirements will be set in the appropriate Spectrum Analyzer. And then to moderate volume on a pink noise signal sound reinforcement, audio 20-20kHz, delicate micro adjust equalizer for each frequency, while maintaining a consistent volume, makes the room Spectrum Analyzer shows the frequency response curve at each test point basic straight, and good Equalizer the frequency location. Similarly in the volume is small and rated the volume, and then on the equalizer for debugging and logging, and finally those records are good Equalizer frequency to compromise, and then use the Spectrum Analyzer is a high level of test stalls, the appropriate amendments to determine good Equalizer frequency location. Note that the equalizer debugging, mixer often balanced point must be 0, and other peripheral equipment you want in the bypass condition. Also, consider the ordinary person listening habits, you can set the equalizer 10k above signal attenuation due to do something.

3. the e-modulus prescaler access system, divider debugging. For just as the bass speaker frequency prescalers, you can debug the equalizer, let the bass system work alone, the divider of the crossover point from 150-300Hz, appropriate to adjust the bass signal gain, you can feel the volume suitable for, and then, together with the full-frequency system, balance, bass and demo full-frequency sound volume; for as the full-frequency divider system, be sure to reference loudspeaker manufacturers recommended crossover point to settings, and then repeatedly adjust the gain of the frequency band signal until you hear are more balanced, then the reference is followed by the sound pressure level test to gain further fine-tuning can be.

4. the sound pressure level of determination. Similarly the pink noise meter access sound amplifying system, like the debug Equalizer as select several test point sound level meter, the sound system in all settings are finished, the last open system equipment, gradually raise the volume, and noise signal requires the best dynamic signal, adjust the gain of the device, making the system sound amplifying sound pressure in the test points must meet the design requirements, while at the same time need to reference sound pressure level to high, medium, and low of the band, and then on the equalizer and divider slightly to do some adjustments, and, of course, high, medium, and low of the band's sound pressure level is not possible to exactly the same, General, in order to take into account the characteristics of the auditory sense are required in the high frequency of the sound pressure level on some lower, while the DISCO system bass system open and low frequency sound pressure even higher. In the sound pressure level of the test, you need to associate each test point comparison of sound pressure level, if the result is larger, the deviation of the acoustic field uniformity is not good, they should be carefully analysed and improved, and this issue will be covered later.

5. the microphone and the effects of debugging. For microphone debugging usually category, vocal, musical instruments used in wired microphones often require daily users with complete debugging needs to know about good people, various musical instruments the most reasonable microphone type and uses a distance, the sound quality is good, no smell of line noise; and wireless microphone: the location of the antenna must be reasonable, microphone use dead point and point to insufficient feedback, and more on location for the record, the receiver of the signal gain to be adapted, noise suppression of fine tuning knob to repeated debugging; for the effects of debug project requirements are not stringent, as long as the signal input and output gain adjustment is reasonable, the guarantee of a certain margin, and the reverberation time and delay quantity limited in scope, so as not to affect the clarity of language and the continuity of the signal, and other specific use adjustment allows the operator to themselves.

6. for compressor for debugging, generally to other equipment debugging basic finishes. In most projects, the compressor unit's role is to protect the power amplifier and speakers, as well as maintain a sound stable, so the first visual signal strength to set the compression level, usually from the start level do not set too low, otherwise the system sound quality will be affected, but the setting is too high may lose protection; compression startup time settings should not be too long, so protection is not timely, but too short and will undermine sound, produce strange sounds, compression recovery time was too short, otherwise it will produce strange sounds; compression in general engineering set to about 4: 1. In setting the compression on the noise gate, you can in this way: If the system does not have any noise, noise gate can be closed, if you have a certain amount of noise, noise gate threshold level setting in the lower position, so as to avoid signal intermittent burp phenomenon, if the system's loud, it should works on the analysis of construction, and should not be separate use noise gate. In short, the compressor for debugging without a specific set of standards that are required under the basic conditions and sound quality, comparison to find the one over the best point.

The other sound system equipment debugging will no longer do them one by one, as we described in the specific project debugging should carefully read the design specification and product descriptions, detailed step by step, without destroying the sound field, optionally using a variety of audio processing equipment, meet the design requirements.