*** Procurement catalog is not completely unified, the classification of goods have fine and coarse, but the "recorder" broad classification is:
Goods - mobile storage devices - USB flash drives, mobile hard drives, digital companions, voice recorders, and so on. -U disk, mobile hard disk, digital companion, voice recorder, etc.. Or Cargo category - general equipment - office automation equipment - mobile storage devices - ... ....
Question 2: Is a voice recorder considered a fixed asset? The banners, Mengxi Hi-tech Development Zone, Food and Drug Administration Branch, the city drug testing center, the bureau organ sections:
According to the "State Food and Drug Administration on the issuance of food and drug supervision and management system in the central and western regions of the purchase of equipment for administrative law enforcement (the first batch) of the notice" (State Food and Drug Administration Office [2009] No. 112) the spirit of the autonomous region of the Food and Drug Administration in In March 2008, the digital camcorder, tape recorder allocated to the municipal bureau, the municipal bureau in accordance with the requirements of the allocation to the branch offices, drug testing laboratories and the Bureau of the relevant departments. In order to strengthen the management of fixed assets, in accordance with the autonomous region Food and Drug Administration "on the allocation of mutual municipal bureau of digital camcorder notice" (Inner Food and Drug Administration financial letter [2009] No. 23) and "on the allocation of allied municipal bureau of the letter of the tape recorder" (Inner Food and Drug Administration financial letter [2009] No. 22) the spirit of the unit in accordance with the financial regulations, as soon as possible, will be the digital camcorder, tape recorder recorded in the accounts of fixed assets.
Question 3: What is the recorder One is based on the time you need to record to determine, depending on whether you are at work all the time open recording or to the need to open. If it is always on, then you need this recorder in the case of the best recording effect recording time to reach your usual work time. In fact, nowadays, the capacity of 128M can be achieved. Of course, in the middle may also need to change the battery, because the battery quality is not good, can not reach the time claimed. Secondly, if you want to put it in your pocket to record outside sound, you need this recorder to have the function of an external microphone, preferably one that comes with an external microphone itself. So put the recorder in your pocket, put the microphone in an inconspicuous place outside the clothes, such as the line from the back to the bottom of the shirt collar, unknowingly, you can record all the conversations. The effect is not bad. As for the price, now the recorder after all is still more professional equipment, so the price has been relatively high, the general need about five hundred dollars, so the price may not be very cheap. Now the MP3 and MP4 can record, but most of these are only incidental functions, can not external microphone, and the effect of recording is very poor. So it's better not to filter MP3/4 in your case. Now the brand and model of the recorder are too many, you can go to your place to sell these products in the mall to go around, as long as it can meet the above requirements, the price is also appropriate, then you can take it. Brand, the domestic brand for the recorder are just put into production, so it is best to find some do recorder longer brand.
Question 4: How to buy a recorder? What are the good recorders? At present, the market has a wide range of brands of recording pens, many digital audio-visual brands have launched their own recording pen products, in view of this, to remind the majority of consumers, the performance and effect of the recording pen to refer to the following factors: 1. coding program. Some professional voice recorder, such as the sea smooth high-tech, purple, South Korea Hyundai, Sony, using a professional noise reduction recording chip coding program; 2. Signal-to-noise ratio. Professional voice recorder will be labeled with its recording signal-to-noise ratio, such as the sea smooth high-tech, South Korea's Hyundai, ZiGuang is >=80, (unit: decibel DB), and some brands will be labeled with signal-to-noise ratio, but is the MP3 playback audio decoding signal-to-noise ratio, that is to say, a professional voice recorder is a noise reduction in the recording, and non-professional only in the recording of the file playback when the file is a noise reduction process, the two are The two are very different.
Selection and purchase of digital voice recorder to pay attention to the following aspects: 1, recording time; battery continuous working time is generally about 2-26 hours, can meet the needs of most people. However, it should be noted that if a very long recording time is due to its use of a high compression rate to obtain the words, often affect the quality of the recording. 2, the recording mode; the recorder is usually labeled with SP, LP, and other recording modes SP said ShortPlay that is the short mode, this way the compression rate is not high, the sound quality is relatively good, but the short recording time. LP said LongPlay, that is, a long time mode, high compression rate, the sound quality will have a certain reduction. In general, like the purple, Korea's modern sound quality will be better.3, the sound file storage mode recording time is related to the sound file storage specifications supported by the recorder, the current common LP (long time recording), SP (standard recording), HQ (high-quality recordings) of three basic modes.4, the storage mode
Random that is, the built-in memory, the digital recorder are using analog recording Flash memory is characterized by power failure, the information saved on it will not be lost, theoretically can withstand millions of repeated erasure (ordinary users who can not count), so the repeated use of the cost is zero. 5, related functions; voice-activated recording and telephone recording function is more important, voice-activated recording can be in the absence of sound signals to stop the recording, sound signals when the resumption of the work to extend the recording time, also more power saving, quite useful. The telephone recording function is convenient for telephone interviews and note-taking. In addition, there are segment recording and recording marking functions, which are more efficient in managing recording data, and are also quite important. In addition, additional functions such as MP3, repeat and removable storage will also bring great convenience and can be selected according to the need. There are two Korean Hyundai F26 and F28 also has a directional recording function, only record you want to record the direction of the sound source, greatly reducing the surrounding noise interference. 6, the sound sampling rate; the ratio of the sound collected per second, the higher the sampling rate, the better the quality of the sound the clearer it is.
According to the current market information analysis and processing of the data obtained by showing that Delta, Apple, Purple, Korea Hyundai, Sony sales rankings in the forefront, Delta, Apple, Sony belongs to the high-end brand price is generally in the 800 yuan or so. Tsinghua Purple, South Korea's Hyundai is a domestic cost-effective products around 200 dollars. In the audio acquisition, processing, functional architecture, as well as conduction output have been recognized by many consumers and praise. Suggested purchase of South Korea's Hyundai (F26, F28, F82, F86, F92), Tsinghua Purple (v-p609).
Question 5: What is a linear voice recorder? Linear voice recorder is a kind of recorder, belongs to the audiophile grade recorder, the sound quality is very good, not only recording, used to direct push medium-sized headphones to enjoy music is also good.
Recording pen:
Digital voice recorder, also known as digital audio stick or digital recorder, a kind of digital recorder, in order to facilitate the operation and enhance the quality of recording modeling is not based on a simple pen type, easy to carry, and at the same time have a variety of functions, such as laser pointer function, F-figure FM, MP3 playback and so on. Compared with traditional audio recorders, digital voice recorder is to record audio by means of digital storage.
Question 6: What equipment to buy to check for cameras and voice recorders at home Use specialized anti-reverse detection equipment. Individuals can choose conventional detection equipment such as, the detection distance is normally within 10 meters, depending on the source of the detected emission and where the scene, where the radio waves within the operating frequency range, can be detected. If you need a high degree of reliability and accuracy of the test, it is best to choose the detector, the detector is mainly for all wireless transmitters, the effective detection range of 100MHz-3500MHz, compared to say that has a very high degree of reliability, maneuverability and accuracy, it should be noted that the detector and the detector can only be detected to the emission of radio waves of the camera and recorder, and the detection of radio waves. At the same time in use, should also pay attention to the vicinity of whether there are cell phones, BB machines, walkie-talkies, wireless PDAs, wireless laptops and other sources of interference, because they are working in the radio waves emitted, are in the detection of the frequency range of the higher requirements of customers, we are based on the basis of the provision of a more professional, high-level, user-friendly detection capabilities; and for, the detector uses optical principles, specifically to capture the imperceptible Micro-camera and infrared emitting devices, regardless of whether the device is in the shooting state, so the detector are able to effectively detect the use of, wireless connection of the secret shooting device, fill the blank of wireless detection.
Anti-laser, you can use a laser detector to detect the presence of laser indoors, such as indoor laser intensity in excess of the amount of warning signals; anti-laser jammer by sending out a mixture of acoustic waves, thereby changing the received signal, you can effectively prevent laser.
Question 7: What equipment is needed for recording The simplest is a recording device such as a recorder. In addition, you can also use a computer and other equipment, but it is necessary to have a microphone and the corresponding software support! In addition, there are more professional things chant, such as recording studio equipped with professional recording equipment.
Question 8: What equipment can be installed to eavesdrop on each other's conversations? Trackers or recorders? There are watches inserted inside the mobile card, give each other with a very beautiful often show the time, and then their own cell phone to install a software, open to see where he is, but also ~ ~ ~ ~ ~ listen to - ~ ~ ~ ~ said ~ ~ what
Question 9: How to detect the room has not been installed by someone to install a camera or placed listening devices? For example, the tape recorder and so on? There is no specialized testing equipment? 20 points Want to find the camera, the first thing you need to know from the working principle of the camera to start, to see what places can start to detect. Any camera needs to take the visible light in order to image, so the first thing you can start is the lens, all the lenses can be very good at reflecting light, and the reflected light is very distinctive. The first is that even if the ambient light is white, the reflection will be colorful (glass refracts different colors of light differently), and the second is that the lens is a convex lens, and the point of reflection is much smaller than the incident light. This point can be an important means of finding the camera. Specific search method is also very simple, is to take a flashlight to each look like a hidden camera of the small hole to shine, and then observe the reflected light. The best practice is to shine the flashlight at the front camera of the laptop or cell phone, shaking the flashlight back and forth, if you see this small colored reflection, and shaking the flashlight when the reflection point, you are even beginner. This is usually the camera's lens reflection:
This is their own shot of the laptop camera reflections, click to enlarge, you can see the red circle inside the two reflective points, respectively, yellow and blue. General small holes are either not reflective, or reflective are a piece, will not be such a bright spot. Of course, professionals work will not be so inefficient, there are a lot of detectors on the market with the same principle made out of the detector, in fact, are lens detectors. Around a circle is the LED light, the center is the reflection detection sensor. The second breakthrough is the image sensor (CCD/CMOS), they themselves have no problem, but these sensors are generally required to generate a crystal clock, pixel by pixel (field clock) line by line (line clock) scanning imaging. The generators of these clocks will leak electromagnetic waves at relatively fixed frequencies. The line clock is generally in the range of 12MHz to 30MHz, and the field clock is generally in the range of 15.625kHz (PAL), 15.750kHz (NTSC). The former can be detected with a multi-band radio in the short-wave band, and if there is generally no electromagnetic shielding of the camera, you can listen to the clock signal in about half a meter; the latter can be bought very cheap ultra-low frequency VLF receiver, and it is not difficult to make your own. In addition: now there are cameras with high resolution, so the clock frequency will also change slightly. The third breakthrough is that the big internal power consumers including image sensors/DSP/MCUs get hot. Since image processing is more computationally resource intensive, the heat dissipation of all these devices will eventually be exposed. But this detection requires a thermal imager. And sometimes the camera is deployed inside an appliance, which is when this type of detection doesn't work. The fourth breakthrough is the power supply. Since all stealth cameras need to work for a long time, they usually do not choose battery power. So the power supply is the essential foxtail of the camera. This restricts the camera generally need to pull a power cord over in a hidden place, or installed inside an electrical appliance. The former can be found with the usual wire/metal detectors applicable to construction work; the latter can help narrow the search - focus on finding inside appliances. The final breakthrough is the communications outlet; no one puts up a camera without capturing video. So the video is bound to have wired or wireless outlets as well. Wireless outlets can be detected with a broadband RF scanner, such as 50MHz to 3GHz. 9 times out of 10, there's a problem if a furniture appliance is transmitting radio in an abnormal frequency band. Wired outlets are usually wired with power cords, and the above mentioned wire tester is just as applicable. Some cameras will use the local memory card, then there must be people often move traces, and *** people will often show up, the risk is too great, this way to use very little. Said so much, focus on which places are most likely to put pinhole camera it:
Roof (good line of sight) especially light sockets, power panels, smoke detectors, fire drenching sprinklers bookshelves on the book (hollowed out), folders TV, stereo speakers behind the net behind the table and chairs along the wall under the wall hanging appliances such as clocks, air conditioners, ventilation fans bedside tables alarm clocks, ornaments, etc. *** of the equipment The investment is directly proportional to the value of the information obtained, if people really use the above methods can not be detected equipment to ***, then your privacy is really worth too much money. I believe that in this case you don't need to look for answers on Knowledge, because you can definitely afford to hire professional anti-bugging experts to clean every room for you. Well, that's it, I didn't realize there was so much to say. To add: some answers say infrared detection, which basically doesn't work. Not many of these cameras are actively emitting infrared, and that would be too easy to expose. Legal issues: installing hidden cameras in private locations in the US ...... >>
Question 10: the recorder belongs to the recording peripherals love application-WPERyinshuang07 for you to answer:
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