Operational sound recording..

Апр 27, 2024
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Operational sound recording. Operational sound recording.


The activities of a modern employee of state law enforcement agencies or commercial security services are unthinkable without various office equipment or electronic equipment: they can significantly increase its information content, give it a comfortable and creative character. One of such devices is a micro cassette tape recorder, the technical and functional capabilities of which allow us to consider it as a very effective tool for many purposes. This easy-to-use and reliable device can become a reliable assistant in various business and operational situations, it will help save time, money, and sometimes solve problems that, it would seem, have nothing to do with sound recording.
This is not an advertising exaggeration. The wide possibilities of using sound recording technology are evidenced by many years of experience in its use in the activities of special services.
Due to the fact that the cost of tape recorders, as a rule, depends on their functionality, dimensions, weight, you should choose a model of a sound recording device based on those tasks that the owner wants to solve when using it.
So, what are the capabilities of micro cassette recorders?


The dimensions of modern micro cassette recorders are really comparable to a pocket notebook, which allows you to have it with you all the time without any inconvenience. Just like in a regular notebook, you can record on a cassette tape any information you are interested in, including instructions to your secretary about your plans for the future.
For these purposes, you can use the cheapest and simplest devices that do not have great functionality (Appendix No. 1). So, on a simple tape recorder with a micro cassette MK-90 at a normal speed of 2.4 cm/sec, you can record 1.5 hours of information. At a speed of 1.2 cm/sec, the recording time increases to 3 hours.

Referent secretary.

If you have a microcassette recorder, there is no need to take it with you to business negotiations or important operational conversations with a secretary or stenographer. The microcassette player will perform their duties more fully and accurately. At meetings, seminars, meetings, etc. There will be no need to take notes from speakers or remember “informative” ones. It is enough to record them on the microcassette player you have with you.
Subsequently, the cassette with the recorded information can be transferred to the secretary-typist, who, after processing the information, will draw up a document of the required form. If you made a recording while on a business trip, the microcassette can be sent for subsequent processing to your company by mail or transmitted over a telephone line at increased speed for subsequent processing. In the civilized world, as they say, these forms of recording and transmitting business information are used very actively.
The undoubted advantage of this use of a microcassette tape recorder is that, in addition to saving time, you have the opportunity to allow the secretary to process only the information that you consider necessary. To do this, it is enough to first erase the areas of the phonogram that are not intended for unauthorized persons.
If the proposed method of using a microcassette player suits you and you plan to use it quite actively, we recommend that you also purchase service equipment for processing phonograms, since it is inconvenient to listen to recorded information on the microcassette player itself. The tape recorder is used mainly for recording and, to some extent, monitoring listening to recorded information. A service device with a foot control panel will allow the secretary-typist to use the rollback mode for the length of a misunderstood phrase, smooth adjustment of the playback speed and a number of other functions that allow faster and better processing of phonograms.

Documentation of conversation (information).

Like any sound recording equipment, a microcassette recorder has the ability to document any information presented in audio form — be it an oral conversation, a telephone conversation, a speaker's speech, signal messages, etc. A phonogram is a full-fledged document, only made not on paper, but on a magnetic medium.
In the cases described above, we were talking about sound recording explicitly or “openly,” when the fact of its implementation was not hidden from the interlocutor. However, in business practice there are situations when, for some reason, you are not interested in the interlocutor knowing about documenting the conversation. In these cases, a small-sized micro-cassette recorder is simply irreplaceable. The dimensions of modern small-sized tape recorders allow them to be hidden under clothing, in internal and patch pockets, and also to be camouflaged in things, interior items, etc. (Appendix N2). For example, the PaNasoNic RN-Z36 and Olympus L-400 tape recorders have dimensions of 53x75x15 mm and 55x75x23 mm, respectively (Appendix No. 1).
To obtain the best quality of phonograms when placing a tape recorder secretly, it is recommended to use standard remote microphones included in their kit or specially made microphones camouflaged to look like various products — “badge”, “watch”, “fountain pen”, etc. (Appendix No. 2). To document telephone information, it is recommended to use remote inductive telephone adapters that are connected by contact to telephone sets, handsets or telephone cables, or contactless devices.

Control over personnel activities.

Tape recorder capability Objectively recording acoustic information allows it to be used as a fairly effective means of checking personnel and monitoring their work, i.e. carry out some kind of “verification” activities regarding employees and their connections.
Often it is enough to instruct your employee to record his meetings with business partners. Having then familiarized yourself with the audio recordings of the conversations, you will be able not from the employee’s words, but to independently and objectively assess the true nature of his relationship with his connections, and the correctness of his behavior during negotiations. If necessary, this will help you make adequate and timely adjustments to the work of personnel.
The scope of application of micro-cassette tape recorders is significantly expanded by such additional functional devices as — acoustomat, hourly auto-start, auto-reverse, recording time registration, remote control panel, etc.
Acoustomat is a device that provides automatic start of the tape recorder in the presence of an acoustic signal and interrupts recording in his absence. This mode allows you to significantly expand the time of continuous recording due to the “information compression” of the phonogram or to record only when there is significant information (as is the case during a telephone conversation, conversations on a radio station, etc.).
Hourly autostart is a device that allows you to turn on a tape recorder at a predetermined time (it is possible to delay the turn-on time of the tape recorder up to 24 hours).
Autoreverse allows you to record on both sides of a microcassette without turning it over, thereby doubling the continuous recording time. So, if on a regular micro-cassette player using the MK-90 micro-cassette the maximum continuous recording time is 1.5 hours, then with auto reverse it reaches 3 hours.
Registration of recording time — the ability to display on the display of the tape recorder the date and time of the start of recording of each fragment of the phonogram.
Remote control panel — a device that allows you to secretly control the operation of the tape recorder.
The presence of the listed devices makes it possible to use microcassette recorders in seemingly completely unexpected, but qualities quite useful for commercial activities. Here are some examples in this regard.

Telephone recorder.

Often, security services, in order to prevent the leakage of information from offices that constitute official secrets for them, use equipment that records information transmitted over their telephone lines. Typically, stationary tape recorders are used for this purpose, specially adapted for working on telephone lines.
What can you do if there is an urgent need to temporarily equip a third-party phone with a similar device? This problem can be solved using a microcassette tape recorder connected to a telephone line through a matching device and operating in acoustomat mode. Information from a telephone line can also be taken and recorded using a contact inductive sensor.

Tape recorder as a “watchman-witness”.

It is in this unusual capacity of a security device that a microcassette player with an acoustic machine can be used. If you want to make sure that no one has entered the room of interest, be it a safe room, an office, a hotel room, an apartment, etc., in your absence, it is enough to secretly place a microcassette player with an acoustic machine in it, having previously removed or turned off all sources of acoustic noise . Now, if someone breaks into the room, the acoustic machine will work, the tape recorder will turn on, and all sounds associated with this penetration will be recorded on film.

Spare alarm clock.

A microcassette recorder with a one-hour self-timer allows you to record automatically even when there is no one to turn it on. And one more unusual use of it. If your alarm clock has broken down or you absent-mindedly forgot to take it with you on a business trip, use the same microcassette player. At the right time, it will turn on in playback mode and wake you up.
These far from complete possibilities for using a microcassette recorder allow us to consider it as a very useful technical tool that can provide you with effective assistance in carrying out any activity. But, like any technical means, this type of sound recording equipment, under certain circumstances, can cause you major inconvenience and sometimes very expensive troubles, which you need to pay attention to.
A dangerous enemy in the wrong hands.
When negotiating, You should remember that their progress can be documented without your knowledge using sound recording equipment, including a micro-cassette recorder. Subsequently, these materials can be used to the detriment of your interests and even to exert appropriate pressure on you.
As a technical means by which it is determined whether your interlocutor has a tape recorder, we can suggest the product DM-3 (TRD-800), which detects a tape recorder operating in recording mode at a distance of up to 6 meters (Appendix No. 3). In addition, the capabilities of a microcassette player allow it to be used as a so-called “bug” or a functionally complete means of eavesdropping. Here are some examples of the possible use of a microcassette recorder in a similar capacity that have taken place in practice:

  1. Knowing that at a certain time you have scheduled a meeting, someone visits the room the day before where this meeting will be held, and In a secluded place he leaves a microcassette player with an hourly autostart. At the right time, the tape recorder will turn on and record the entire course of the meeting. After this, all that remains is to remove the equipment at the appropriate moment and familiarize yourself with the contents of the phonogram.
  2. You and your colleagues are holding negotiations with a business partner, where you are discussing the possibility of concluding a deal that is beneficial for your company and the level of the most acceptable conditions. Your partner, who has a micro-cassette recorder camouflaged as a natural household item (paper folder, book, attaché case, etc.), asks you several “sensitive” questions about pricing, delivery conditions, taxation, etc. , under a plausible pretext, leaves the premises for a while, leaving a camouflaged tape recorder in it. Naturally, you continue to discuss the issues posed with your colleagues, without thinking about the secrecy of the information circulating in the room, since only company employees are present in it. The partner returning after some time completes the negotiations and leaves the company, agreeing on a new meeting and taking with him a recording of the conversations conducted in his absence. It is possible that this phonogram will cause significant damage to your company.
  3. You are working on a commercial transaction in which you act as an intermediary. This situation is characterized by the fact that your competing partner is interested in “taking you out of the game” and going directly to the “manufacturer”. For this purpose, the following combination is carried out. You are scheduled for a business meeting (let's say in a restaurant). The meeting place is selected so that there is a telephone nearby, and a micro-cassette recorder can be discreetly placed next to it. During the meeting, the partner, under a plausible pretext, asks you to urgently contact the “manufacturer” and clarify any details of the transaction. At the same time, he remains sitting at the table and, not suspecting anything wrong, you alone fulfill this request and make this call.

As a result of such a combination, your competitor partner has a phonogram at his disposal, from which he, at a minimum, recognizes the manufacturer’s phone number. This number can be easily determined by the nature of the sounds produced when the telephone dialer operates. If during the telephone conversation there is any other information about the “manufacturer” (for example, the name of the company, its address, names of employees, etc.), then the information received by the partner will be sufficient to stop working with you as an intermediary .
We have given just a few examples of the use of a microcassette player to illustrate its capabilities as an effective means of commercial espionage. Naturally, the question arises: what can be opposed to the hidden use of sound recording technology against you and eavesdropping systems in general?
The issues of maintaining the secrecy and security of the activities of any structural unit are a serious and multifaceted problem that can be solved from the standpoint of comprehensive security. In this regard, our company, taking into account the high professional knowledge of its employees, a large set of special technical means that allow us to solve any given problem, the ability to provide equipment of both domestic and foreign production, relatively low prices (compared to other companies), etc. ., is ready to help you in solving any problems related to security.

Appendix No. 1.

AD- 1. Tape recorder PANASONIC RN-Z36.

Modern miniature microcassette recorder in a metal case. Variable sensitivity of the microphone, which can be made remote using a cable. Tape counter. 2 speeds, recording up to 3 hours on MS-90 cassette. The complete set includes a 220 volt adapter, amplifier, case, headphones. Dimensions 102x65x17 mm. Weight — 108 g.

AD-1-2. Tape recorder OLYMPUS L-400.

Professional micro-cassette recorder with auto-reverse and VOX system. Built-in microphone, remote control, tape counter, 2 speeds. The complete set includes a remote control, an adapter for mains power, an earphone, an MS-60 microcassette, and a case. Dimensions 73x52x20 mm, weight — 90g.

AD-1-3. Microcassette recorder.

Standard microcassette recorder in a plastic case. 2 recording speeds, built-in microphone, VOX system, silent stop when the tape ends. Dimensions 120x66x26 mm, weight — 155 g.

AD-44. Hidden miniature microphones.

Highly sensitive miniature microphones in a pen, watch, and badge, etc. Allow you to record an important conversation in a noisy place. Built-in microphone amplifier. Power supply from a watch battery is continuous for several months.

Appendix No. 2.

AD-5. Tape recorder in the bag.

A tape recorder installed in the bag for secret recording of long conversations. Provides high quality recording even in noisy environments. Hidden tape recorder control, silent tape stop. It is possible to install the tape recorder in various models of bags (ladies', sports, men's, etc.).

AD-6. A tape recorder in a book.

The microcassette recorder is installed in the book. A highly sensitive microphone and amplifier provide high-quality recording in a room up to 15 square meters. m. The VOX system turns on the tape recorder from the voice. Duration of recording on an MS-90 cassette is up to 3 hours with auto-reverse.

AD-7. A tape recorder in an attaché case.

A microcassette tape recorder is hidden in the attaché case, which has a normal appearance both inside and outside. The microphone in the wall of the briefcase provides high quality recording. Hidden control, silent stop of the tape recorder. Possible installation of a tape recorder in various models of briefcases.

AD-8. Electronic stethoscope.

Pocket electronic stethoscope with a high-quality amplifier and AGC allows you to listen to conversations through walls, doors and windows. It is possible to connect a tape recorder. The set includes headphones. Power supply from 9 volt battery. Dimensions 88x55x17 mm.

Appendix No. 3.

DN-3. Detector of tape recorders and radio emissions TRD-800.

The small-sized device TRD-800 is designed to identify working sound recording equipment or search for radio-emitting devices. The reception of radiation is signaled by the glow of the LED and silent vibration of the device.
The receiving antenna can be discreetly placed under the operator’s clothing. The device is powered by a built-in battery. There is a regulator for automatic level setting.
Technical characteristics:
Operating frequency range — 1 MHz-1000 GHz.
Power supply — built-in rechargeable battery.
Dimensions — 22x57x89 mm.
Weight — 170 g.

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