The most common microphone from Comcom from the company, with the speaking name "Shore". The manufacturer produces microphones with a cylindrical body of nickel-plated aluminum.

The attached instruction indicates:

Highly sensitive active microphone

Appointments and features

• Active microphones "Shore" are designed to control the audio situation in the premises and on the streets with the possibility of installing in places with a high level of noise.
• The automatic amplification controller (RSU) of the output signal supports a permanent signal level at the output, regardless of the sound level in the controlled room.
• The ability to connect to video surveillance systems and audio control to record sound at various times. Miniature sizes, at the expense of which the microphone is easily and conveniently mounted in almost any place.
• High sensitivity and low noise level of built-in amplifier. High noise immunity provided by nickel-plated aluminum housing.

Specifications:

Parameter	shorok-1	shoreok-7.	shorok-8.
Acoustic distance	up to 5 meters	up to 7 meters	up to 10 meters
Line length	- up to 300 meters
Signal / noise ratio	49 dB.	55DB
NOT linear distortion ratio	0,5%	0,3%
Depth of ARU	not	53DB
The speed of ARU	not	0.4 seconds
Output voltage	0, 25V.	0.60V.
Food	DC5 ... 12V.
Operating temperature range	-10 ... + 50 ° С
Gabarits.	D10X35 mm	D10x47 mm

Appointment of microphone contacts

Attention!!!
When connecting the microphone strictly observe the polarity !!!

We will get closer to the microphone of the rustle-7 with a nickel-plated aluminum housing.

Individual features of the microphone Shoreok-7:

• automatic gain adjustment
• low current consumption
• nickel-plated aluminum case for shielding from extraneous electrical interference
• miniature sizes

What cable to connect the microphone?

Can be used vitua couple At short distances up to 30-40 m. This distance is enough to install the microphone in a small store, home, office. The problem when laying a twisted pair, these are interference created by power wires and working equipment. On some objects, there may be no interference in small distances.

• at a distance of up to 300 meters Use SCWEV 3x0.12. This is a thin combined cable that is easy to lay through its flexibility and a small diameter.
• with a distance from 300 to 1000 meters indoors: It is worth using a cable cross section no mene 0.5, for example, KVK 2x0.5;
• with a distance from 300 to 1000 meters for laying on the street: We advise you to use Street Combined CBC Cable 2x0.75.

How to connect a microphone to the video recorder?

When viewing the image from the cameras, I want not only to see the frames of what is happening, but also to hear what they say. Now many models of video recorders have a microphone connector. Sometimes it is even provided for the connector for each camcorder.

This part of the article shows the microphone connection schemes for the video recorder through different types of cable. When choosing a microphone, pay attention to the fact that microphones with ARU (automatic gain adjustment) are not required to be adjusted, the microphones are required without ARUs.

At first glance, everything seems to be clear the microphone connection to the DVR is carried out by the RCA type "Tulip" plug. But when it comes to implementation, questions arise here. Where to solder, fasten, secure? Because, all-selling microphones for video surveillance do not have RCA connector.

Consider a detailed scheme for connecting the three-wire microphone "Shore" to the tulip connector.

Connection diagram of the three-wire microphone rustle to the tulip connector.

The red wire +12 B is connected to / + / power source, which can serve as a standard power supply or UPS. Almost always the microphone connects to the power supply to which the camera is connected.

Blue Wire "Common" or minus, connects to the outer part of the RCA connector and to / - / power supply terminal.

The yellow wire "Audio" is connected to the central pin RCA connector.

Connection diagram of the three-wire microphone "Shore" by a combined cable to the tulip connector.

The red wire +12 in the microphone is connected to the plus diagram of the power supply.

Blue Wire "Common" or minus from a microphone, simultaneously connects to a minus blue wire and further to the power source, as well as in parallel to the braid of the combined cable and to the outer part of the RCA connector.

The yellow wire "Audio" is connected to the central core, and then to the central contact of the tulip.

Microphone connection to speakers

Microphone connection diagram to computer columns through a standard mini-jack 3.5 mm connector. The output voltage from the microphone is enough to directly connect to the speakers, to the LINE-IN connector, to a TV or other equipment.

Connection diagram to speakers

Connect the microphone to the computer.

5b, 12b can be taken from the power supply of the computer.

Voltage on Winchester or Drive IDE Wires:

Purpose of the output of the IDE power connector IDE (presented in the form of a table)

And remember: Art. 137 and Art. 138 of the Criminal Code of the Russian Federation illegal sharing or dissemination of information (acoustic information) on the privacy of the person who makes his personal or family secret without his consent, is pursued by law.

Video surveillance systems are one of the key points in the resolution of various conflict situations. Relying only on one video, it is impossible to determine with accuracy, it has grilled or the seller to the buyer, roughly drawn nanny with the child, which was exactly the cause of fight on the street.

Varieties

By placement relative to the camcorder microphones for video surveillance are divided into and built-in. Built-in microphones are less suitable for use at least they are installed in the camcorder directly at the factory. Typically, these devices have a wide focus chart that it does not allow to write a clean sound, as not only the human voice will be heard on the record, but also the sounds of all what is happening around.

An external microphone is not included in the standard delivery package of any video surveillance system. Outside the camera, can be connected using the wires to the chamber or directly to the video recorder or be wireless. The latter option relates to spyware and is limited to the use of the legislation of the Russian Federation.

Also distinguish between the design differences in microphones for IP cameras of the surveillance:

• Perping - devices that have small dimensions is usually used in hidden video systems;
• Guns - they specifications Allowed a directional sound recording at a considerable distance from the observation object without a significant reduction in the quality of the audio file. Microphones are equipped with special filtering screens that protect the device from writing outsiders.

Criterias of choice

Most experts recommend using external microphones in video surveillance systems. Such a choice is due to various external factors affecting the choice of the optimal installation location of the chamber and microphone. The camcorder must be at a considerable distance from the object of observation. In the premises, it is mounted on the wall under the ceiling, or directly on the ceiling itself. The microphone embedded in the video surveillance chamber will be in the zone where all the sounds of human or the operation of a variety of equipment are arrived and summed up. For this reason, the audio file will be contaminated with outsiders will require additional processing on complex algorithms.

There is overcoming this problem:

1. First, the use of directional sound recording system, but they are pretty overall and expensive.
2. Secondly, stereo microphones. Such equipment can be used exclusively in modern security systems, as the overwhelming majority of DVRs do not have a two-channel sound recording system.
3. The optimal option in this situation is the use of an outdoor microphone, located as close as possible to the object of observation. It is recommended to use active devices equipped with preamplifiers, which reduces distortion and interference.

Connection schemes

How to connect a microphone to a video surveillance camera? The microphone connection to the digital IP camcorder does not represent special problems. Most modern models have a special audio output to which the corresponding audio recorder wires are connected according to the following scheme.

To activate the microphone, the camera needs to set the type of video and audio stream. In order for the video recorder not only video and audio information.

Connecting the microphone to the video recorder

Almost all modern models of video recorders regardless of their type have audio inputs. The main question occurs not in the connection scheme A when choosing a cable to broadcast an audio signal. Professionals typically use a combined coaxial cable. For a short distance, within 300 meters, a thin cable of the SCWEV 3x0.12 brand is used, which, due to flexibility and minor diameter, is very easy to lay. For a distance in the range of 300 - 1000m, a thicker cable with a cross section of a wire of at least 0.5 mm can be used. - KVK-2B2x0.5. For laying outdoors, it is recommended to use a combined street cable type KVK 2P2x0.75.

To install the microphone in a small office within 30 meters, it is not allowed to use the ftp cable twisted steam. It is recommended that the use of the shielded cable is recommended as the radiomagnetic flooring from the power supply of the room will create significant interference of the audio recordings.

A brief overview of microphone models

MKU-3P - three wired microphone, 12 volts nutrition. Records sound in the frequency band from 150 to 10,000 Hertz, has accurate adjustment of the gain of up to 2000 times. When using a wire with a diameter of 0.5 millimeters, the maximum transmission distance of 500 meters. He has protection against cords.

Series Shorok (1, 7, 8). Miniature devices aimed at 10 meters. Signal transmission distance up to 300 meters. Output nominal audio voltage of 250 MB. Signal-noise ratio 64 DB 0 5% The body of the polished aluminum device shields a sensitive sensor from extraneous electrical flooring.

An electrical capsule microphone with manual adjustment of the gain in the range of 0 ... 100 times. Records audio signal in the frequency band from 150 to 1000 Hz. The maximum range of audio signal transmission during a segment of 0.5 mm is about one and a half kilometers.

This type of devices is applied not only in security or registering systems. Audiomicrophons are required when recording any solemn events on a video camera so that after some time it was possible to recall any event not only as a silent movie.

However, to ensure optimal sound quality and conformity to its recorded picture, it is recommended to select the microphone by type as compatible with the video equipment.

In the electrical equipment market, this type of gadgets has many varieties. For example, they are separated by the method of placement relative to the camcorder on:

1. Built-in / external.

The first is most of the popular video cameras. However, they, as a rule, do not give clean sound, as it is a multilateral, and therefore, it is equally written to both the information that tracks the camera and extraneous noise behind the angle of its lens. For example, the video will be a conversation of two people, but in the audio response, their speech will be discovered by outsiders around, including bird singing or rumble of cars on the road.

Second external devices Sound information records are usually located outside the camcorder. They can connect to it by means of a wire with a connector, as well as transmit audio data to it using a separate communication channel. Microphones of this type, as a rule, write the sound better, first, because they do not save them as in embedded counterparts, and secondly, due to the fact that they can be installed completely next to the controlled object.

According to the design, such devices are also divided into types, for example, they are:

2. Pelic / guns

Devices for recording sound on a looper differ in miniature sizes, so they are often used with hidden video. However, they are quite universal and can function with most fixing devices, including video recorders.

Cannon is a second type of audio roots, which has a feature of the directional capture of audio filings. They apply to high-quality sound playback. Therefore, there are special screens in their design that perform the role of noise filters.

Also microphones have the following labeling:

3. Active / Street / Analog

Active, that is, in its design, its own amplifier, which allows you to get a better and powerful beep for subsequent recording and playback.

Street audigadges are usually equipped with noise filters, otherwise due to the abundance of noise on the audio recorded with the help, it is difficult to disassemble anything. They are also designed for sharp oscillations of noise, and even a sound blow, for example, from a sharp clason of the machine can not bring them out of order.

An analog microphone is a sound sensitive membrane capable of responding to oscillations of sound in the surrounding space, converting them to a beep with an electromagnetic system.

Criterias of choice

1. To pay attention to

The sensitivity of the device that determines the area of \u200b\u200beffective capture of audio information. It depends on this parameter whether on a certain distance from the entry object is fixed by its dissection or it will be muffled with the noise of silence and interference in the real, working radius of the device.

Devices are recommended in which a built-in low-frequency interference filter is present to neutralize background, technical noise, for example, from air conditioners, fans, refrigerator compressor, or passing vehicles.

The location of the microphone in a protective casing, which can significantly reduce the number of interference in the record. In this case, it will serve as an acoustic screen that reduces the non-target noise, which is coming from the back and side of the device. So, with the perfect location of the sound source from the front from the device, the sound recording will be cleaner.

The microphone sensitivity feature allows you to use such a device in different conditions and setting, configuring it in an optimal way each time.

2. Requirements

It is recommended to use in the protection systems exclusively external devices. Because for this purpose, the camcorder is located on a certain removal from the observation object to ensure the maximum coverage angle of the recorded space, while the microphone must be placed somewhere in the center of this area, it effectively captures the sound only within a small radius around itself.

When using the built-in pickup directly on the camera, which in the closed rooms is often fixed on the flat surface of the wall, reinforcing all background noise, it will not be possible to get high-quality recording.

A significant improvement in the sound could provide the use of several pick-up devices, but in video surveillance systems, even a two-channel sound recording is extremely supported, for example, video recorders record only single-channel sound.

As a result, we can conclude that the best option It is an outer microphone located in close proximity to the source of the recorded sound. This should be an active device having a preamp function and signal filtering from interference and distortion.

Overview of the best models

In order to choose the optimal version of the equipment for the video surveillance system, it is necessary to pay attention to its technical characteristics, specifics of application, features, price and brand manufacturer

Description:

Microphone model called Shoreok-7. Due to its small size, it is great even for hidden surveillance systems.

No less high-quality instrument model - MVK-MO22, Also having miniature dimensions.

Often, in complete independence and high distance between the microphone and the camera there is no need, and the best option is a simple paste microphone, for example, AUDIO-TECHNICA ATR-3350 Providing better quality for its price.

Specifications:

1. Shorok-7 is an active device with an amplifier mounted in its body, providing an acoustic range of effective sound perception of up to seven meters. It is installed in a light and durable aluminum case, which, moreover, thanks to the properties of the metal, also reduces the effect of external interference on the internal amplifier filling of the device.
2. MVK-MO22 uses a reflector in the form of a microelectric capsule. Also, its design allows you to transmit data on the connection scheme of all of the two wires, due to which the data transfer is possible for a distance to one kilometer, however, subject to the shielding of the transmitting cable.
3. Perping model is equipped with a connecting cable with long six meters. Autonomous diet of the device is carried out from the usual tablet battery.

Pros and cons:

1. Provides a constant quality and signal level, regardless of the room noise. However, to ensure perfect sound requires accurate installation and adjustment to the recordable object. It is also equipped with an embedded gain author, which supports high sound quality even with an ever-changing interference ratio.
2. This microphone is distinguished by universality, as it can be applied together and with conventional analog, and with digital cameras. Included in the delivery with it there is an adapter-output power controller. Its design provides a huge distance of transmitting audio data to the recording device.
3. The petrogen microphone has so small dimensions and weight, What is easily fixed with the help of a small crocodile even on clothes.

Price:

1. Shoreok-7. Depending on the store, you can purchase for the price. from 600 to 800 rubles.
2. MVK-MO22 When buying will cost the price up to 300 rubles.
3. Petter AUDIO-TECHNICA ATR-3350 – about 2500 rubles.

Audio amplifiers

The most qualitative and expensive microphone models are equipped with a special audio amplifier, which often having a sound preamplifting function.

Such equipment requires special nutrition, which in some models, in general, is autonomous and does not enter the cable from the recording device, but from its own removable power supply in the form of an electrical battery. The amplifier significantly increases the effective remote to capture the sound of the microphone and its further transmission over the cable to the recorder.

Connecting a microphone to video surveillance

The external microphone is connected to the camcorder using a special cable with a plug at the end, providing not only to transmit audio data from the device to the video equipment, but also from it to power to it ensure the operation of its filling, in the form of filters of interference suppression and amplifier.

Microphones "Shore" The most recognizable sound recording devices in the video surveillance market. Excellent characteristics and rather low price of the entire line allows you to choose a model for absolutely any goals and tasks.

Consider the popular models "rustle" and the microphone connection scheme to the video recorder and the camcorder.

Differences of microphones Shorokh

The product line today 8 models that differ in the following main criteria:

1. Availability of ARU adjustment - automatic gain adjustment.
2. Acoustic range of perception (For example, the rustle-1 to 5 meters, and the Shoroha 21 to 18)
3. Revolution - over a high level of sensitivity (perfect parameter for observation systems, this parameter has a model: Rustle 11, 12, 13 and 21.

On video: Test of the popular microphone Shorokh-8

Connection schemes

Connecting to the video recorder

To connect the microphone it is more convenient and more reliable to use the KVK cable. From the microphone, the yellow cable (sound) is connected to the central residential (+), the blue twisted with the braid (-) and the KVK residential power supply (-), the red connects with the plus of the power cord cable cable. On the part of the DVR under a special RCA connector, the connector is screwed or soldered (depending on the connector) the central cable KVK cable, the braid is clamped in the holder. (The enclosed connector is connected to the Audio In socket). premises.

Shoroch connection to IP Camera

Since NVR recorder rarely comprises an audio input The microphone is connected to the chamber (if such a function is supported). Camera connection scheme is no different, but depending on the camera connector, you may need a special jack 3.5 adapter

Where to hide the microphone?

All line microphones besides Shorok -1 can be installed anywhere: on the ceiling, in a plinth, etc. due to the adjustment of the ARU and the feeder. Shoreach -1 has no adjustment, and the useful radius of the sound capture is up to 5 meters, so this model is better installed directly in the sound zone.

Microphone Shore is hidden in the ceiling