Weak current College】 【pickup device installation methods and considerations.

1. Select the installation location for pick-up
Often clients ask the installation location of the problem, we know that the video is a linear collection of audio is omni-directional collection. Pickups are generally suitable for installation in any of the plane, including ceiling, wall or directly on the side of the desktop or the end of the table. Try to rely on the main sound source.
For example: the trial Chamber can be installed in the near vicinity of trial one side wall; the classroom can be installed near the podium; small conference rooms can be installed in the ceiling. Whether it be embedded or attached to a surface, as long as they do not cover the microphone hole for pick-up.
Installation principles: as close as possible to the main conversation area, this pickup better.
Second, the choice of pickups connection cables and wiring
In the end is what cable used in the most appropriate, to look at front side pickups to back-end recording equipment, if the distance is short, for example, only a few metres, SWIFTCN pickups/listening head can use ordinary telephone line, category 5 shielded twisted pair cable, the network/non-shielded signal cables, etc. If distant, or complex environment, such as around the signal transmitter or other wireless communication devices, you should use a cable with shielding layer, it is recommended to use RVVP2 * 0.5 or 2 * 0.75, principle is farther thicker wire as possible. Pickup power generally use remote centralized power supply (i.e. audio recording equipment-PA equipment-centralized power supply), using the power cable can be in General, if there is an electromagnetic interference, it is best to use shielded cable shield in pickups can not answer, the back-end grounding.
Note: wiring the best individual alignment, not with AC and other strong electricity using the same cable trough, at the same time as far away as possible from the transformer, Rectifier, lamps and strong electromagnetic interference device. Audio cables and power cables from the alignment, it is best to avoid current interference.
Third, the supply of related issues
The damper power supply requires use of the remote centralized power supply (i.e. audio recording equipment-PA equipment-centralized power supply), whose primary purpose is a antijamming ability and noise. 12V power supply for pick-up General DC electricity, if the distance, in room for voltage 15V. Since the pick-up is very sensitive to small signal amplification device, power supply noise sensitive, be sure to use the clutter of clean high-quality DC regulated power supply.
A single SWIFTCN pickups consumption current of approximately 1-20 Ma, 1 a DC regulated power supply could pickups for several SWIFTCN. at the same time Does not require separate for each pickup device with power adapter.
Here refers to the DC power supply is often say "transformer", generally consists of power transformer, Rectifier diodes, filter capacitors and integrated voltage regulator.
Try not to use the switching power supply, it might cause a large number of circuit noise! there is a lot of switching power supply quality, ripple coefficient is very large, will cause a buzz for pick-up.
What is a switching power supply?
Simply put: it is switching DC power supply, electronic switch tubes and electronic switching shocks is composed of an automatic regulator power supply. For example, a normal desktop computer power supply is switched off.
4. power supply anode and audio to connect the ground wire of a total of
SWIFTCN pickup device audio ground and power negative one, must also receive negative DC regulated power supply and the audio device for audio input (LineIn) on the ground.
If the power and audio and not well connected, will result in reduced sound quality or no sound. If the audio device and not of LineIn terminals and touch the ground pickups, generally speaking, the sound will be very small.
(1) 3.5 stereo plug: for sound mixer, IP network camera, etc.
(2) Lotus plug: mainly for audio equipment or video equipment between lines of input and output jack.
(3) BNC plugs: mainly used video equipment, but there are many brands of DVR/card and use it to the input audio signal.
5. audio line-in connection
Audio signal cables and audio ground can be directly connected devices:
With earphones, active speakers, audio amplifier, audio and video distributor, DVR hard disk recorders, video server, sound mixer, recorder, audio, or other audio device LineIn linear input (non-connected microphone interface).
1, hard disk video recorder. Hard disk recorders are a corresponding audio input port, generally coaxial BNC plugs. Pickup device audio cable you need to connect to BNC Plug pin position of Center, and pickups public requires a connection to BNC Plug shell (which is connected to the coaxial cable shield copper network)
2, since the band power amplifier for active speakers. A set of common Active speakers generally is left only, which correspond to the audio cable of the left and right channels. This section provides all the sources for pick-up only, so it is "Mono" sources. Pickups for audio cable is connected loudspeaker cable of the left/right channel audio line, and add sound pick-up public line ground wire.
3. other issues such as power amplifiers, mixer and audio device connection method is equivalent in that manner.
4, is strictly prohibited to pickup device access the sound card, sound mixer, amplifier, microphone (MIC) input, otherwise you may damage the device. This is because although pickups also contains the microphone inside, but also includes zoom, noise reduction, ECHO processing circuit, output 1Vpp above "LineOut" audio signal.
5. notebook computer rarely equipped "LineIn" audio input jack, generally equipped with MIC input jack and SPEAKER output jack. Pickups cannot directly access to the MIC port, you can only buy a professional external USB desktop audio, use the "pick LineIn" port.
6 pickup device audio line cannot directly receive two audio devices must be connected for pick-up adapters to avoid due to impedance mismatch may be caused by poor sound quality.
Note: in all the connection process or toggle switch, your zoomDevice volume adjustment to a minimum to avoid moments of electric shock.
6 pickup FAQ and troubleshooting
(1), pickup device in use most commonly encountered problem is silent. Available process of elimination to determine:
1, multimeter measuring pickups-DC power supply voltage, the voltage between the 9V-15V;
2. If you have multiple pickups they cross-wiring, to determine whether it is a pickup or connector or other equipment failure;
3, if the audio cable from other audio devices, disconnect after connecting directly to the desktop audio linein interface for the operating system comes with a tape recorder software for testing. If the sound normal description pickup device does not have a problem, check the connection of audio equipment, or other aspects;
4. wiring is intact and reliable;
5, magnification device interfaces and pickups are complementary, zoom device volume is adjusted appropriately;
6. strictly forbidden to pickup device access the sound card, sound mixer, amplifier, microphone (MIC) input, otherwise you may damage the device. This is because although including pick-up internal microphone, but also includes zoom, noise reduction, ECHO processing circuit, its output is more than "1Vpp LineOut" audio signal.
(2), pickups have great noise or low quality. Please check the following:
1, the pickup device cannot use switch power supply, please use the high-quality 12V common DC regulated power supply.
2. If the audio cable from other audio devices, disconnect after connecting directly to the desktop audio linein interface for the operating system comes with a tape recorder software for testing. If the sound normal description pickup device does not have a problem, check the connection of audio equipment, or other aspects;
3. check whether the noise caused by the sound of self-excited: listening with speaker mustn't and pickups are too close, try not in the same room for testing. Due to the high sensitivity for pick-up, the speaker's voice feedback to pickup device's microphone inevitably lead voice of self-excited screech. The same room to listen to, you can use headphones.
4. wiring best individual alignment, not with AC and other strong electricity using the same cable trough, at the same time as far away as possible from the transformer, Rectifier, lamps and strong electromagnetic interference device. Use 3X0.5RVVP shielded cables are also able to effectively prevent outside interference, which require grounding shield single-ended (see previous link).
5. strictly forbidden to pickup device access the sound card, sound mixer, amplifier, microphone (MIC) input, otherwise you may damage the device. This is because although including pick-up internal microphone, but also includes zoom, noise reduction, ECHO processing circuit, its output is more than "1Vpp LineOut" audio signal.
6, video monitor with speakers, but the difference may effect, use high-quality headphones or powered speakers to listen.
7, some computer motherboard integrated sound quality is poor, serious noise when recording, use the wings and other brands of high-quality independent sound card.
8, output impedance SWIFTCN pickups to 1000 ohm, back-end of the acquisition card audio input impedance needs in between 600-1000 ohms (including critical value);
9. check the pickups sound gain potentiometer or amplifying device volume is adjustable.
10, brand audio splitter quality is not high, leads to sound a stuffy, cracking, etc., using high quality dispenser or our pickup device adapter.
11, some models of hard disk recorders focused only on the video processing and ignore the audio processing may cause synchronization to a video of the poor sound quality. Please disconnect the hard disk recorders, and then the direct use of high-quality headphones or powered speakers to listen to the received audio line up. If the sound quality is very good, you can determine the pickup device quality without problems.