【 Weak current College 】 peripheral equipment in use in sound reinforcement systems

With the development of modern electroacoustic techniques, types of peripheral devices already quite rich, specifications, brand is also increasingly used; but the universal does not mean free, peripheral equipment use although can be more than one way, and it shall be according to their specific function and purpose of the use which, otherwise either play poorly, even outweigh and create chaos, affecting the entire electro-acoustic system of practical technology issues put forward some ideas for your reference.
1. frequency equalizer
Professional sound reinforcement system using frequency equalizer to select 1/3 octaves machine as well, the equalizer is generally not less than 30 adjustable frequency; greater than 2/3 octaves (such as 15, 10-stage) models in any professional audio systems are less suitable. Frequency setting of the equalizer for each frequency are managed wide, in the adjust frequency characteristics in fact additional distortion occurs, the influence of the voice timbre is obviously sound reinforcement system sometimes create new troubles. Frequency Equalizer using purpose should, as far as possible, a single, one Equalizer don't both system frequency characteristics of balance and tone adjustments, this will only cause confusion.
Typically, in sound reinforcement system for regulation of timbre and does not require very precise, accessible by a mixer on each of the input channels of balanced devices, professional mixer on such equilibrium are adjustable frequency inflection points, greater adaptability, if there be multiple frequency Equalizer adjusts tone, a reasonable approach is to separate configuration dedicated equalizer, so as to adjust the tone and change the entire system of frequency balance.
It should also be noted that must focus on sound reinforcement system system frequency balance adjustment more scientific and rational, not some, such as suppression microphone screech point to vaguely Act (only inhibits the screech is another matter). Frequency balance of significance not only for sound reinforcement places and microphone, so you cannot simply to adopt the ordinary microphone search Whistler points way to adjust the equalizer, because this way not only extremely one-sided, also affected by the characteristics of the microphone and the error is large, it is simply impossible to achieve a balanced system. Reasonable manner as possible, the use of broadband is one of the pink noise sources for calibration, and must select a reasonable test points as possible in order to fully fix the sound of the Hall.
2. acoustic feedback suppressor
In recent years on the market of acoustic feedback suppressor in effective suppression of sound reinforcement system for acoustic feedback and minimize the loss of both timbre is significant progress, but also explore how to use.
It inhibits the acoustic feedback, acoustic feedback suppressor and multi-frequency Equalizer main differences:
First, you can automatically search control, quick and accurate;
Second, the more narrow bandwidth or adjustable, side effects, can realize the depth of suppression.
It should be noted that a sound reinforcement system as long as the equipment, the environment, the system acoustic characteristics that basic qualitative, system frequency balance once adjusted well, that should be fixed, and should not be subject to the influence of acoustic feedback. The resulting problem is, how to sound reinforcement system properly connected acoustic feedback suppressor. Acoustic feedback suppressor is, after all, to address the spectrum site features to work, so it directly concatenated sound reinforcement system for use in the main output channel is not desirable, would undermine the entire system of frequency characteristics.
Acoustic feedback suppressor directly to the microphone, a reasonable connection is a way to insert it in a separate mixer channel output bus of the group into the mouth (INSERTS), and in that grouping as microphone dedicated channel. Then use the channel output mixed keys be marshalling Terminal signal and the master output channel. This can clearly use acoustic feedback suppressor of targeted and can avoid another sound source signal and frequency characteristics of the system as a whole.
In addition, in the practical application can experience the acoustic feedback suppressor is not on the timbre of small to negligible levels. In concert, mostly to close strong signal pickup sound reinforcement systems, transmission gain little problems, and therefore not recommended, even so require, the principle is the start level should be based on effective transport gain to reference setting, the second is not turned on excessive suppression channel to help ease their impact.
3. sound actuator
Acoustic excitation for now is not so strange, but some people still know it is not clear. Acoustic excitation is mainly used to compensate for the high-order harmonics sound signal loss, this harmonic timbre to the sound and texture effects, sharpness great frequency components. Sonic Exciter is a focus on high-frequency harmonics of compensation, does not alter the original high band frequency range, its compensation effect and frequency Equalizer is fundamentally different. Whether in the pickup or sound reproduction process, sound waves in high-frequency components of the transmission is extremely easy to wear and tear, and contains many sound compositions and the articulation of the higher harmonic details lost much more; this will make the sound clarity and sharpness are subject to significant influence. Sonic Exciter function is the basis for a sound base frequency (frequency optional) to derive its high-order harmonics to compensate for its transmission loss, strengthens the ability of dialysis sound and impressive. Using the equalizer for high-frequency boost compensation, the voice sense and actuator is clear and rigid compared to, and in sound reinforcement systems in both the slope or frequency-spectrum site upgrade, microphone, raises the self-excited screech. Actuator does not increase the incentive to do amplitude, frequency is using the high-order harmonics and controllable and superimposed on the original signal, because of the harmonic frequency ranges of audible, often do not, generally not thrown self-excited whistling, but its compensation effect than use the equalizer to clear, soft, fresh and relevant.
The use of acoustic excitation principle is reasonable, to stimulate selected frequency according to the different sound sources, different occasions and different performance objectives; in particular about carefully, according to different sound sources configured multiple actuators to differentiate performance not simultaneous sources of sound characteristics, such as band and vocal, wind instruments and strings, percussion, etc.
Should also be noted that, in total output channel threaded acoustic actuator used nor reasonable. In the contemporary sound sources, like CD, DAT and professional recording of analog tape programmes usually are serious and need for sound processing and sound actuator was originally from a professional recording studio came out in the; That is, most of the sound source and does not require the "incentive" again, too. In sound reinforcement system actually almost only microphone such transmission loss and unauthorized modification of signals has the necessary compensation. Therefore, the actuator is to insert the microphone used for marshalling channel more reasonable, if more than one when the actuator can be inserted in the microphone input channel to the difference of insert mouth. Compression/limiter compressors is typically used for automatic control of those too high and unexpected high level signal, to avoid for system devices (such as speakers and amplifier) cause harm, but also can significantly slow down the sound signal distortion. Compression using points is to each function key lock switch for serious set, or to cause damage, or sound will never work to protect the safety of equipment.
The main points of its adjustment should note the following:
(1) input level matching: cannot use compression with no signal source level is high, if the input level is too high and compressor for input levels of damage, one can imagine the consequences (in practical application does have this type of situation exists).
(2) start the level of adjustment: in sound reinforcement system compressor for boot-level normally should not exceed 0Db, for the purpose of securing the safety of the system, consider set at-10 to-3dB, because excessive signal start not exceeding the threshold will no longer grow, but will set the compression rate decided exactly how much growth, you must have a certain dynamic allowance.
(3) compression ratio: excessive compression ratio makes large-signal is too obvious sense of compression, when recovery time too short time its respite are also obvious, so instead has formed a new sound reinforcement quality; too small compression ratio is not the role of (at this point no matter how many starting level setting). Typically, the compression ratio is 1: 3-1: 5 has been able to deal with, and will not significantly affect the sound formation.
(4) recovery time: in General, the recovery time should not be too long, otherwise they will be given to the "old breath" of feeling; and a short recovery time will significantly undermine sound or no compression artifacts. [fenye]
About BBE technology is not only invented in recent years, but still not widely to know. Called BBE technology is a revolutionary audio sector "and not exaggerated" outcome (the principle see related article). Due to the dynamic speaker voice coil resistance characteristics inherent in the sense that its effect on the audio reproduction of people for many years on improving the quality of the various efforts have been made in the terminal devices on significant discounts, high-frequency signal unavoidable delay and phase shift the sound intensity in the definition, and the overall sense, because the disorder but faded charm, despite the delay actually short almost made it to ignore, but when and after using the BBE when comparing the effectiveness of, and experience to it's bad character. BBE's technical features at the "bad": dynamic speakers though it is of high latency, but can be arrested so that low-frequency also make some corresponding delay to force synchronization, good ear for this delay and insensitive, but can clearly feel the sound texture changes. The fact that people are fooled again by delay "," touched by both the BBE, this change or even make a balanced investment compensation and incentive for fade. Essentially, BBE completely should become a system configuration (threaded on the amplifier or Terminal Distributor before then), since any use of dynamic speaker sound system are the BBE technology, but because the BBE also can be a "softening" of information technology, like "SRS" class of "3D" technology and acoustic stimulation, etc can also be a "softening", so it's actually been "lurking" on many audio software (such as CD and "acoustic tape) have come to the people around. Actual use of the problem is, as has been the voice of the BBE process and no standard software, so identified with BBE sound system equipment shall be carefully distinguished from the broadcast software (especially the publication), so as not to make the sound of the "long neck" and the sense of touch.
4. the effects
Effects are definitely not appropriate any channel bus in direct connection with the performance of equipment, such as DJ and some in the band's microphone is not suitable for joining the reverberation, pre-recorded sound source (e.g. CD, tape) are not required to add effects, so effect signal should be selectable. Typically, to the effects of the signal input from the best channels of the managed to the EQ and faders (POST) auxiliary output group leads, which not only its tone and mixing are more uniform, it returns the channel is always to reduce operational trouble. If the former from the faders (PRE) leads not controlled auxiliary output signal, so as long as the effect returns is normally open State, regardless of their signal leads channel faders is what state, as long as the microphone signal generation will have the effect of sound, this return will cause some unexpected crosstalk and unnecessary busy.
5. with regard to digital processor
In recent years to market digital processor combines multiple peripheral devices feature set, giving the impression that to a ten, omnipotent, but in fact the case. Digital processor provides connections, operation and selection of facilities, also provides an integrated means of processing, it does not take professional system and performance requirements, because many of its features are generally associated with the application, not separately. Such as equalization and feedback suppressor together started, the system must be balanced feedback inhibition effect, so many will feedback suppression feature "fade" treatment, most configurations dual three-segment suppression filter to emergency needs.
Of course, there are now also able to achieve "channel segmentation" processor, but the premise is that cost. On the application of digital processor must be careful, it's normal, perhaps the sound system is a simple and convenient choice.
6. with regard to the aid of a specific connection
Here it is, to full and effective use of auxiliary equipment, sound mixer configuration should be more complete and better. As already mentioned, some peripherals can be concatenated, some are not. To this end, a professional sound reinforcement system must be configured features relatively sound mixer, such as grouping, insert the port, auxiliaryHelp output and input, channel combination (combination of output), and other functions should be a must have. If you set for the microphone, dedicated group in the grouping channels to insert mode over LAN configuration acoustic feedback suppressor, Sonic Exciter and even for the frequency of the tone control and press Equalizer etc, its terminal signal the marshalling of mixed output key and the master channel and other signal output combination. Do not put the Group channel mixing console simply as the signal distributor to use, set the Group's purpose is not so simple. Group's main purpose is to handle different signals respectively. Only for the purposes of the microphone, some need for acoustic feedback suppression as a group, the rest of the series as the other group (such as the band signals) and can be equipped with the required sound processing devices, CD, DAT and others without further processing of pre-recorded sound sources can be directly fed into the main channel, last shot at channel terminal output. This seems to bother, but in fact is a little effort, signals and equipment can be "get" and "best service", not only have one sound quality and easy operation with it, such as on the band and singer sound ratio between the total adjustment, by marshalling general control can be completed quickly, without the need to draw up a bunch of faders, need to be reminded that different brands of marshalling channel mixer blend kin have different callout, as there's a MIX, some L/R, etc.