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1, a digital camera: refers to the camera's image processing and recording signals using digital signal completion of all cameras. The most important feature of this camera is recorded on the magnetic tape signal to a digital signal infrared surveillance cameras, rather than analog signals. A digital camera image taken by the CCD signal is converted to an electrical signal, via the circuit immediately digitized, after all the processing on the recording tape prior to all of the digital processing, and finally the processed digital signals directly recorded on the tape. Different data must be converted to the corresponding transmitted signal to: analog data typically analog signal (Analog Signal) home monitoring camera, for example, by a series of successive changes of electromagnetic waves (e.g., radio and television broadcasting electromagnetic waves), or voltage signal ( as telephone transmission of the audio signal voltage) to represent; digital data are digital signals (Digital Signal), for example, by a series of discontinuous change of voltage pulses (e.g. we can use a constant positive voltage represents a binary number, with a constant negative voltage represents a binary 0), or optical pulse to represent. When using a continuously varying analog signal is represented when the electromagnetic wave, the electromagnetic wave itself is both a carrier signal, while as the transmission medium; and when using a continuously varying analog signal to indicate when the signal voltage, which is generally through the traditional analog signal transmission line (e.g. a telephone network , cable television) to transmit. When the digital signal using discontinuous change in voltage or light pulses to indicate when surveillance cameras, usually you need to use twisted pair cable or fiber media to connect surveillance camera parameters communicating parties to the signal from one node to another . (2) conversion between analog and digital signals between analog and digital signals can be converted to each other: the analog signal usually through PCM pulse code modulation (Pulse Code Modulation) method to quantify the digital signals, analog signals that allow different amplitudes corresponding to different binary value, e.g., 8-bit coding the analog signal is quantized to 2 ^ 8 = 256 orders of magnitude, often practical to take 24 or 30 coded; general digital signal by a carrier wave phase shift (Phase Shift) The method is converted to an analog signal. Computer, computer LAN and MAN are using binary digital signal, the current WAN computer is actually transmitted both binary digital signals, there are obtained by converting the digital signal to analog signals. But the more promising application is a digital signal. CTV HD network camera brands Ann HD surveillance cameras _ good as Ann (certified) _ surveillance cameras provided by the Futian District, CTV An e-business. Futian District, Shenzhen good as the Electronic Business Department (www.szjsa.cn) Guangdong Shenzhen, surveillance cameras leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In good as the security leadership with the staff warmly welcome all inquiries negotiations to create good as safe a better future.