What are the advantages and disadvantages of the digital matrix and the analog matrix?
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Based on different video switching modes, video matrices are divided into analog matrices and digital matrices.
The video switching is completed at the analog video layer. Signal switching is mainly implemented by using single-chip microcomputer or more complex chip control analog switches.
The video switching is completed at the digital video layer. This process can be synchronous or asynchronous. The core of the digital matrix is the processing of digital videos. The adconverter must be added at the video input end to convert the analog signal to a digital signal, and the DA Converter must be added at the video output end, converts a digital signal to a analog signal. The core part of video switching is the analog switch of the analog matrix, which becomes the processing and transmission of digital videos.
Advantages of digital video Matrix
Cost advantages: Video matrix and DVR are combined into one
Using the digital video matrix solution, you can implement both the video matrix and DVR functions with only one device, greatly saving costs. Matrix Control and DVR control are integrated to facilitate flexibility. If a simulated matrix is used, at least one matrix host and one DVR host are required. Installation and debugging are complex. In addition to the DVR cost, a high cost is required for the simulation matrix. In addition, external devices, such as display devices, matrix controllers, and matrix control keyboards, are required to control the analog matrix. Some complex functions even require dedicated PCs for configuration. The analog matrix scheme also requires the allocation and reuse of video signals to achieve the video recording function of the DVR. The digital matrix is used only by adding a simple matrix module on the basis of the DVR, the cost is relatively low, the integration of digital matrix and video system is high, the stability is enhanced, and the maintenance cost is also reduced.
Features: flexible configuration, powerful functions, and easy to use
In the simulation matrix + DVR solution, the matrix and DVR are independent and need to be controlled separately. The operation modes provided by the simulation matrix are complex, easy to operate, and have a single function, complicated operations are required to implement complex functions. A digital matrix can be used to simultaneously control the Switching Matrix and DVR through a control platform, the operation interface can be freely developed by secondary developers in Windows or Linux. You can customize applications, Customize various functions, and build a system based on your customer's needs, depending on the developer's own software.
In the digital matrix, Digital Processing Based on images: you can perform a lot of processing on the image while performing video switching, such as overlapping characters, overlapping images, and area covering, these are common functions of DVR, but for the analog matrix, because its core is based on analog signal processing, in the face of these functions, it seems powerless. Here, the character Superposition Function is used as an example. The analog matrix usually requires an external character superposition chip. Generally, it can only implement ASCII code, that is, English character superposition, there are very few simulations that can achieve Chinese Character superposition, not to mention supporting both simplified, traditional, and even Japanese. As for features such as image superposition, it is basically impossible to achieve at the analog signal layer.
The digital matrix provides richer image display modes. The traditional analog matrix can only output the simplest image at, while the digital matrix can achieve n → 1 (by scaling the image, multiple images can be displayed in one window), 1 → N (one input image is displayed at multiple outputs at the same time), and even in-picture and other advanced functions.
Finally, the system stability, digital matrix + DVR solution, high system integration, low power consumption, high stability; and the use of analog Matrix Solution, due to the need for multiple devices, the probability of problems is greatly increased.
Potential: huge development space
The analog matrix control system is very mature. Its product structure and functions have not changed much in recent years or even in more than a decade, and the potential to be mined is very limited.
The digital matrix is completely different. The current development of digital technology can be described as changing and promising. First of all, with the improvement of hardware performance, in the aspect of High-speed bus: 66m PCI bus has been very mature and universal, such as PCI-E or other high-speed serial bus is also constantly proposed; chip technology: a high-performance DSP of 600 m, m, or even 1 GHz has emerged. It can be said that thanks to the continuous improvement in the performance of the hardware platform, the digital matrix function will inevitably be continuously improved, constantly evolving to the high-end. At the same time, software advances cannot be ignored. New Image Compression and processing algorithms are constantly proposed, and the efficiency of image compression is constantly improved, there are also constantly more complex and intelligent image processing algorithms applied, such as intelligent mobile detection and Intelligent Recognition Technology (face recognition, fingerprint recognition, License Plate Recognition, signature recognition) at present, there are already mature applications. These higher-level image processing technologies can be applied to our digital video system using the current hardware platform. Therefore, with the rapid improvement of the software and hardware levels, we have reason to believe that the development of digital matrices will be very broad, and both in terms of performance and functionality will inevitably surpass the analog matrices.
Secondary Development is simple and convenient
Unlike the previous H-card and D-card, the new SDK will support both H-card, HC card, and mdcard. You can use only one SDK to control the encoding, decoding, and matrix at the same time. The encoding, decoding, and Decoding in the new SDK are compatible with those in the original SDK, you only need to add the Matrix Control Section, which greatly reduces the complexity of secondary development. At the same time, the H card, HC card, and mdcard can be mixed to facilitate maintenance and expansion of existing projects.
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