First, the choice of installation location
It can be ceiling-mounted, wall-mounted or desktop-mounted pickups. The installation location should be as close as possible to the main conversation area.
For example, in the public security industry, the interrogation room can be installed near the person being tried; the school classroom can be installed near the podium near the teacher; the small meeting room can be installed in the center of the ceiling.
Installation principle: Try to get close to the main conversation area. This kind of pick-up effect is better.
Second, the choice of connecting cables and wiring
Can use ordinary 4-wire telephone line, 5 types of network twisted pair, shielded / unshielded signal cable.
Considering the complex construction environment, it is recommended to use a 0.5mm2 cross-section 3-core signal cable (that is, commonly used 3x0.5RVVP cable) to supply power generally using a remote centralized power supply (ie centralized power supply at the audio recording equipment/amplifier equipment side), The three-core cables used are the power line, audio signal line, and public ground line.
Shielded cables can be used in electromagnetic complex environments where the shielding layer is connected to the equipment ground. That is, one end of the shielding net is suspended, and the shielding end of the equipment is connected to the equipment ground (chassis).
Note: It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.
Third, the power line positive connection method
The power supply method requires remote centralized power supply (ie, centralized power supply at the audio recording device/amplifier device). Its main purpose is to provide greater immunity to interference and noise. It is recommended to use the 12V DC stabilized power supply with the adapter of our company to avoid the degradation of the sound quality due to the unclean power supply.
Because it is a very sensitive small-signal amplification device, it is sensitive to the clutter of the power supply, and it is essential to use a clean, high-quality DC stabilized power supply with a small amount of noise.
The individual consumed current is approximately 50-100 mA, which means that a nominally 2 amp DC regulated power supply can be used for 5 simultaneous operations. The power supply efficiency and line loss should be taken into consideration in the application. Try to use a power supply with a higher nominal value.
The DC stabilized power supply referred to here is often referred to as a "transformer" and is generally composed of a power transformer, a rectifier diode, a filter capacitor, and an integrated voltage regulator.
Try not to use a switching power supply. It may cause a lot of circuit noise! Many of the switching power supplies on the market are of poor quality and have a very large ripple coefficient, which can cause hum.
What is a switching power supply?
Simply put, it is a switch type DC power supply, which is an automatic power supply with an electronic switch and an electronic switch oscillator. For example, an ordinary desktop computer power supply is a switching power supply.
Fourth, the power cathode and audio ground wire common ground connection
The audio ground wire and power cathode are combined into one and must be connected to the negative pole of the DC stabilized power supply and the ground wire of the audio input (LineIn) of the audio equipment.
If the power ground and audio ground are not well connected, the sound quality will be degraded or there will be no sound. If the ground of the LineIn terminal of the audio equipment is not connected to the ground, the sound will generally be very small.
Fifth, audio cable connection
The audio signal line and audio ground line can be directly connected to the device:
Acoustic headphones, active speakers, audio amplifiers, audio and video distributors, DVR hard disk recorders, video servers, mixers, tape recorders, sound cards or other audio devices LineIn linear input (microphone interface is strictly prohibited).
1, hard disk recorders. Most hard disk video recorders have corresponding audio input ports, which are generally coaxial cable BNC plugs. The audio cable needs to be connected to the center pin position of the BNC plug, and the common ground needs to be connected to the shell of the BNC plug (that is, the shielded copper mesh connecting the coaxial cable).
2, comes with power amplifier active speakers. A set of ordinary active speakers are generally left and right, corresponding to the left and right audio channels, respectively. This section only provides one audio source, so it is a "monophonic" audio source. Ericsson's head/pickup audio cable connects to the left/right audio cable of the speaker cable, and the ground cable of the speaker cable is commonly grounded.
3, other audio equipment such as power amplifiers, mixing consoles and other methods of connection are the same.
4. It is forbidden to connect the pickups to the microphone (MIC) input terminals of sound cards, mixers, amplifiers, etc., otherwise the equipment may be damaged. This is because the interior of the pickup includes a microphone, but it also includes circuits for amplification, noise reduction, echo processing, etc., and outputs a "LineOut" audio signal of 1 Vpp or more.
5, notebook computers are rarely equipped with "LineIn" audio input jack, generally only equipped with MIC input jack and SPEAKER output jack. The pickup cannot be directly connected to the MIC port. Only a professional external USB interface desktop sound card can be purchased. Use the “LineIn†port to access it.
6, pickup audio cable can not be directly connected to the two audio devices, adapters must be connected in order to avoid impedance mismatch may cause deterioration of sound quality.
Note: During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.
Six, pickup sound gain (volume size) adjustment
It must be noted that the sound output from the pickup is too loud and the sound quality of the back-end audio equipment such as hard disk recorders and speakers is deteriorated. Please pay attention to adjust to a proper level.
Seven pickup adapter connection
If you choose the company's dedicated dual adapter as the power of the Agilent monitor head/pickup, please refer to the following connection.
1. Provide a clean 12V DC power supply for the pickup to avoid the noise caused by improper use of the power supply or the degradation of the sound quality.
2. Provide two standard audio output terminals (Lotus head) and one headphone/speaker jack for each pickup, which can connect multiple audio devices at the same time.
3. Provide the sound output after mixing the two Eltek monitor heads/microphones.
4. Independent sound gain adjustments for each of the ALERT Heads/Pickups.
5ã€Elite is equipped with a special adapter for the company's monitor head/pickup. The product is not included in the box and must be purchased separately.
8. What problems should be paid attention to when connecting the head/pickup?
It is important that the Elite heads/pickups be mated with other audio amplification, audio amplification or recording equipment. If not connected properly, it will not only affect the picking effect of Alice's monitor head/pickup, but also damage the product and other equipment. During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.
1. The basic requirements for Arit
(1) Matching of signal levels: When connecting the ELITE monitor head/pickup, it is necessary to pay attention to the difference between the input and output signal levels of each device. If the level of the input signal of the fore-stage equipment is too large, non-linear distortion will occur. Otherwise, the signal-to-noise ratio of the playback system will be reduced, and even the amplifier of the next-level equipment will not be able to be pushed. Therefore, attention must be paid when using the equipment. The levels should not differ too much. If the signal level does not adapt in actual use, the input signal level must be reduced by the attenuation circuit, or the level of the input signal must be increased by the amplifier circuit. For the monitor head/pickup, it can be sent directly to the “LineIn†port of the audio device because its output signal level is 0.75~1Vpp.
(2) Impedance Matching: If the impedance mismatch occurs when the Agilent monitor head/pickup is connected to a speaker or other device, the output power of the amplifier may be unevenly distributed, or the transient characteristics of the overdamped ambassador may deteriorate. Impedance matching connections are generally balanced and unbalanced. Balanced means that the two-core shielded line of the transmission signal has the same impedance to ground.
The so-called unbalanced type refers to two-core shielded wires, one of which is grounded. When the balanced output is connected to an unbalanced input, matching transformers must be added for matching.
It should be noted that the output impedance of the Agilent monitor head/pickup is 600 ohms unbalanced.
2. Connector connection method: The connection between Alite monitor head/pickup and recording equipment, hard disk video recorder, sound box and computer sound card is accomplished by various connectors. The following connectors are commonly used.
(1) Two-core/three-pin plug: It is mainly used to transmit signals between various equipments and as input plugs of Aletto's monitor head/pickup input signal. According to its diameter is divided into 2.5mm, 3.5mm, 6.5mm three, two-pin plug for mono, three-pin plug for the two-channel.
(2) Lotus plug: It is mainly used as the input and output plug of the line between audio equipments and video equipments.
(3) BNC plug: It mainly uses the connection between video equipments, but it is also used to input audio signals in many brands of hard disk recorders/cards.
Nine, general troubleshooting
First, the most frequently encountered problem in the use of the Alice head/pickup is silent. Can be determined using the exclusion method:
1. Use a multimeter to measure the dc power supply voltage at the monitor head/pickup side of the Agilent. The required voltage is between 8V and 20V.
2. If you have more than Eletta Heads/Pickups, you can cross-wire and compare them to determine if the product or cable or other ancillary equipment fails.
3. If the audio cable is connected to another audio device, disconnect it and connect it directly to the ordinary active speaker for the Walkman/PC. If the sound is normal and there is no problem with the product itself, check the connected audio equipment or other aspects.
4. Whether the wiring is intact and reliable.
5. The interface of the amplifying device is matched with the pickup, and whether the volume of the amplifying device is adjusted properly.
6. It is forbidden to connect the monitor head/pickup to the microphone (MIC) input of the sound card, mixer, amplifier, etc., otherwise the device may be damaged. This is because the internal monitor head/microphone of Ericsson includes a microphone, but it also includes circuits for amplification, noise reduction, echo processing, etc. The output is a “LineOut†audio signal of 1Vpp or more.
It can be ceiling-mounted, wall-mounted or desktop-mounted pickups. The installation location should be as close as possible to the main conversation area.
For example, in the public security industry, the interrogation room can be installed near the person being tried; the school classroom can be installed near the podium near the teacher; the small meeting room can be installed in the center of the ceiling.
Installation principle: Try to get close to the main conversation area. This kind of pick-up effect is better.
Second, the choice of connecting cables and wiring
Can use ordinary 4-wire telephone line, 5 types of network twisted pair, shielded / unshielded signal cable.
Considering the complex construction environment, it is recommended to use a 0.5mm2 cross-section 3-core signal cable (that is, commonly used 3x0.5RVVP cable) to supply power generally using a remote centralized power supply (ie centralized power supply at the audio recording equipment/amplifier equipment side), The three-core cables used are the power line, audio signal line, and public ground line.
Shielded cables can be used in electromagnetic complex environments where the shielding layer is connected to the equipment ground. That is, one end of the shielding net is suspended, and the shielding end of the equipment is connected to the equipment ground (chassis).
Note: It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.
Third, the power line positive connection method
The power supply method requires remote centralized power supply (ie, centralized power supply at the audio recording device/amplifier device). Its main purpose is to provide greater immunity to interference and noise. It is recommended to use the 12V DC stabilized power supply with the adapter of our company to avoid the degradation of the sound quality due to the unclean power supply.
Because it is a very sensitive small-signal amplification device, it is sensitive to the clutter of the power supply, and it is essential to use a clean, high-quality DC stabilized power supply with a small amount of noise.
The individual consumed current is approximately 50-100 mA, which means that a nominally 2 amp DC regulated power supply can be used for 5 simultaneous operations. The power supply efficiency and line loss should be taken into consideration in the application. Try to use a power supply with a higher nominal value.
The DC stabilized power supply referred to here is often referred to as a "transformer" and is generally composed of a power transformer, a rectifier diode, a filter capacitor, and an integrated voltage regulator.
Try not to use a switching power supply. It may cause a lot of circuit noise! Many of the switching power supplies on the market are of poor quality and have a very large ripple coefficient, which can cause hum.
What is a switching power supply?
Simply put, it is a switch type DC power supply, which is an automatic power supply with an electronic switch and an electronic switch oscillator. For example, an ordinary desktop computer power supply is a switching power supply.
Fourth, the power cathode and audio ground wire common ground connection
The audio ground wire and power cathode are combined into one and must be connected to the negative pole of the DC stabilized power supply and the ground wire of the audio input (LineIn) of the audio equipment.
If the power ground and audio ground are not well connected, the sound quality will be degraded or there will be no sound. If the ground of the LineIn terminal of the audio equipment is not connected to the ground, the sound will generally be very small.
Fifth, audio cable connection
The audio signal line and audio ground line can be directly connected to the device:
Acoustic headphones, active speakers, audio amplifiers, audio and video distributors, DVR hard disk recorders, video servers, mixers, tape recorders, sound cards or other audio devices LineIn linear input (microphone interface is strictly prohibited).
1, hard disk recorders. Most hard disk video recorders have corresponding audio input ports, which are generally coaxial cable BNC plugs. The audio cable needs to be connected to the center pin position of the BNC plug, and the common ground needs to be connected to the shell of the BNC plug (that is, the shielded copper mesh connecting the coaxial cable).
2, comes with power amplifier active speakers. A set of ordinary active speakers are generally left and right, corresponding to the left and right audio channels, respectively. This section only provides one audio source, so it is a "monophonic" audio source. Ericsson's head/pickup audio cable connects to the left/right audio cable of the speaker cable, and the ground cable of the speaker cable is commonly grounded.
3, other audio equipment such as power amplifiers, mixing consoles and other methods of connection are the same.
4. It is forbidden to connect the pickups to the microphone (MIC) input terminals of sound cards, mixers, amplifiers, etc., otherwise the equipment may be damaged. This is because the interior of the pickup includes a microphone, but it also includes circuits for amplification, noise reduction, echo processing, etc., and outputs a "LineOut" audio signal of 1 Vpp or more.
5, notebook computers are rarely equipped with "LineIn" audio input jack, generally only equipped with MIC input jack and SPEAKER output jack. The pickup cannot be directly connected to the MIC port. Only a professional external USB interface desktop sound card can be purchased. Use the “LineIn†port to access it.
6, pickup audio cable can not be directly connected to the two audio devices, adapters must be connected in order to avoid impedance mismatch may cause deterioration of sound quality.
Note: During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.
Six, pickup sound gain (volume size) adjustment
It must be noted that the sound output from the pickup is too loud and the sound quality of the back-end audio equipment such as hard disk recorders and speakers is deteriorated. Please pay attention to adjust to a proper level.
Seven pickup adapter connection
If you choose the company's dedicated dual adapter as the power of the Agilent monitor head/pickup, please refer to the following connection.
1. Provide a clean 12V DC power supply for the pickup to avoid the noise caused by improper use of the power supply or the degradation of the sound quality.
2. Provide two standard audio output terminals (Lotus head) and one headphone/speaker jack for each pickup, which can connect multiple audio devices at the same time.
3. Provide the sound output after mixing the two Eltek monitor heads/microphones.
4. Independent sound gain adjustments for each of the ALERT Heads/Pickups.
5ã€Elite is equipped with a special adapter for the company's monitor head/pickup. The product is not included in the box and must be purchased separately.
8. What problems should be paid attention to when connecting the head/pickup?
It is important that the Elite heads/pickups be mated with other audio amplification, audio amplification or recording equipment. If not connected properly, it will not only affect the picking effect of Alice's monitor head/pickup, but also damage the product and other equipment. During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.
1. The basic requirements for Arit
(1) Matching of signal levels: When connecting the ELITE monitor head/pickup, it is necessary to pay attention to the difference between the input and output signal levels of each device. If the level of the input signal of the fore-stage equipment is too large, non-linear distortion will occur. Otherwise, the signal-to-noise ratio of the playback system will be reduced, and even the amplifier of the next-level equipment will not be able to be pushed. Therefore, attention must be paid when using the equipment. The levels should not differ too much. If the signal level does not adapt in actual use, the input signal level must be reduced by the attenuation circuit, or the level of the input signal must be increased by the amplifier circuit. For the monitor head/pickup, it can be sent directly to the “LineIn†port of the audio device because its output signal level is 0.75~1Vpp.
(2) Impedance Matching: If the impedance mismatch occurs when the Agilent monitor head/pickup is connected to a speaker or other device, the output power of the amplifier may be unevenly distributed, or the transient characteristics of the overdamped ambassador may deteriorate. Impedance matching connections are generally balanced and unbalanced. Balanced means that the two-core shielded line of the transmission signal has the same impedance to ground.
The so-called unbalanced type refers to two-core shielded wires, one of which is grounded. When the balanced output is connected to an unbalanced input, matching transformers must be added for matching.
It should be noted that the output impedance of the Agilent monitor head/pickup is 600 ohms unbalanced.
2. Connector connection method: The connection between Alite monitor head/pickup and recording equipment, hard disk video recorder, sound box and computer sound card is accomplished by various connectors. The following connectors are commonly used.
(1) Two-core/three-pin plug: It is mainly used to transmit signals between various equipments and as input plugs of Aletto's monitor head/pickup input signal. According to its diameter is divided into 2.5mm, 3.5mm, 6.5mm three, two-pin plug for mono, three-pin plug for the two-channel.
(2) Lotus plug: It is mainly used as the input and output plug of the line between audio equipments and video equipments.
(3) BNC plug: It mainly uses the connection between video equipments, but it is also used to input audio signals in many brands of hard disk recorders/cards.
Nine, general troubleshooting
First, the most frequently encountered problem in the use of the Alice head/pickup is silent. Can be determined using the exclusion method:
1. Use a multimeter to measure the dc power supply voltage at the monitor head/pickup side of the Agilent. The required voltage is between 8V and 20V.
2. If you have more than Eletta Heads/Pickups, you can cross-wire and compare them to determine if the product or cable or other ancillary equipment fails.
3. If the audio cable is connected to another audio device, disconnect it and connect it directly to the ordinary active speaker for the Walkman/PC. If the sound is normal and there is no problem with the product itself, check the connected audio equipment or other aspects.
4. Whether the wiring is intact and reliable.
5. The interface of the amplifying device is matched with the pickup, and whether the volume of the amplifying device is adjusted properly.
6. It is forbidden to connect the monitor head/pickup to the microphone (MIC) input of the sound card, mixer, amplifier, etc., otherwise the device may be damaged. This is because the internal monitor head/microphone of Ericsson includes a microphone, but it also includes circuits for amplification, noise reduction, echo processing, etc. The output is a “LineOut†audio signal of 1Vpp or more.
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