Weak current College】 【professional audio bridge connection.

<br> <br> Professional sound reverberation time <br> <br> Acoustic fibrillation, focused, feedback to avoid <br> <br> For sound and vibration, sound and focused, acoustic feedback brings poor sound reinforcement effect, some people will .just have to say in General, all the sound effects for the reason that this equipment is not appropriate, in fact they should fall within the scope of the acoustic field, usually isn't always occur, so in general engineering often cannot cause sufficient attention ., even with these problems, many people don't realize this is the sound field of unreasonable, or just know the sound unreasonable changyuan, there is no solution, for example such a phenomenon, a sound system work generally also fine, but occasionally burst .on the scene can hear the rhythmic as pulse-like "rolled" or "buzz" sound, usually in the low frequency band of a place most prone to the auditorium is the larger the sound and direct sound a long lag between people sounds very uncomfortable .that belong to the sound of fibrillation, reason is: the sound in the Hall in relative back and forth between parallel walls, wall surface reflectance reflex is also very strong, sound can hardly weakened demand in the decoration of the Office at any time check when .there are no two reflective surface large area of strong, there is no parallel appear too much glass, stainless steel structure, because these units in the decoration of the more common things seem to be, is likely to cause problems; sound focus occur some curved .surfaces on large decorative rim or hanging curtains, blinds, etc., to reduce the possibility of sound focus; acoustic feedback early prevention is more difficult, but the design-time cannot accurately predict the frequency of occurrence of feedback, but to prevent acoustic feedback .of actual applications are more important, so you can rely on the design of the early selection of decorating material, analysis of its different frequency of sound absorption coefficient, and the reference to the calculation of the reverberation time is roughly determine, for the construction and .commissioning with the necessary reference, professional audio course to thoroughly address the above issues, rely on the latter part of the device debugging to perfection, to the completion of the project, use the signal generator and Spectrum Analyzer on the reinforcement of regional inspection Indigo point ., use of equipment of repeating debugging to make up for the lack of sound field. <br> <br> Calculation of reverberation time <br> <br> For sound field design, intuitive understanding of the average person can, while contact more just .the reverberation time, because it is designed in the control of the measurement of the importance of lies; if design properly, reasonable reverberation time is reflected in the sound field makes sound system performance is excellent, the impression is that sound great mellow, not excessively .bureaucratic, not interference, it can be said if the previous sound field design requirements are better met, the reverberation time and can control it well, you can make sound effects enthusiastically, calculation before first must select a reasonable reverberation time target values, for the .value of select is generally based on the Hall of volume and uses. <br> <br> While in specific values, most of the design from the Member to be recommended for acoustic reverberation time and then made some relatively small, the reason is: .acoustic reverberation time is unable to control, therefore it is suggested that the more natural sound of the Hall, the better, and hope to do in debugging and use, in the system's artificial reverberation to meet the requirements of the reverberation, at the same time ., in recent years increasing indoor decoration materials, high sound absorption coefficient of materials is widely implemented, making large auditorium of the reverberation time is generally too small, can thus be seen that this design principle of purpose and objective conditions are no doubt, but you .know, mix of acoustic changyuan noise is the sound source produces a sound mix of nature, it is against the direct sound to show its particularity is that the sound field of important characteristics when used in the system into artificial reverberation, equal to the signal to .noise, the other in reverb, the speakers play the sound, is not a recording I hope you hear the sound of direct, professional audio while recording is usually to different degrees of reverb, equal to destroy the program source (source), so this .method not only disrupts direct sound and mixing sound relationship between good background, and contrary to the reverberation of sound fields is to make the room have the proper "ambience" purposes, this author believes you can ask for project design assistant for discussion. <br .> <br> Summary of the reverberation time is calculated as follows: <br> <br> General engineering can at home 500Hz or kHz for detailed calculations, various materials of sound absorption coefficient should be strictly in accordance with the product parameters or building materials .provide data in the manual, otherwise the result is likely to access a larger course for and recommended values base tincture near evaluates, designers do not need too much to ask for decorative flat improvement, because the reverberation time requirements is not a specific absolute value, .if not the disparity is too large, should also be considered in the calculation of the number of spectators on the effects of reverberation time. <br> <br> Professional audio sound field design finally you should also consider the sound pressure level calculated <br .> <br> Its purpose is to give users a viable project in electro-acoustic parameters to allow their safe use device, creating a healthy hygiene listening environments, and also in order to sound engineering of electrical design provide a basis for the selection of the .equipment. <br> <br> The sound pressure level calculated before, you must select a suitable environment for the alignment of sound pressure level, and the choice of reference sound pressure level must understand the normal ear, sound curve, ie the Fleche - .mount Sen curve. <br> <br> The curve reflects the human ear on different frequencies, not simultaneous voltage sense of listening, loudness reaction curve number indicates the appropriate frequency and sound pressure of loudness value, the units are: Phono, ear on .the same sound pressure different frequency response of the sound is not the same, the same sound pressure level of the low frequency sound in the ear of loudness perception than simultaneous high-frequency sound pressure level; to the band's sound in the ear of loudness in .basically the same, there is no sense in certain frequency bands to listen to, you must make the sound pressure to achieve enough sound pressure level, this is the reference sound pressure calculations on the basis of sound pressure selected. <br> <br> .For sound reinforcement works, because the language signal is concentrated mainly in the medium frequency band, and so the response curveOf related small so benchmark sound pressure level can take 70 ~ 80dB; for General music playback of sound engineering, this reference sound pressure can have .85 ~ 90dB as calculation basis; at the same time as the system's sound reinforcement to stay 12 ~ peak of 18dB allowance and 1 ~ 3dB of environmental noise margin, at an average distance of listening, the design of sound pressure rated sound reinforcement should be .: P amount = (85-90) dB + (1 ~ 3) dB and then the actual need according to the halls and auditoriums scope determines average listening distance L, rated the sound pressure level should be in the position of the actual sound pressure .level, and then this can be done by the calculated sound 1m location sound pressure P: <br> <br> Professional audio according to the mentioned previously: distance change doubled, sound pressure corresponding changes in the relationship between 6dB, speaker 1 m Department .needs to provide the sound pressure level: P = P-amount + 6LogL now Shenyang design is basically over, and subsequent work is and architectural decoration units work closely with the design requirements into practice. <br> <br> <br> <br .> <br> <br> <br> <br> <br> <br> <br>.