Buy Sales Asi Adapter Atsc T Module FM Radio Assembly Factory

14-08-2019

Asi Adapter Atsc T Module FM Radio Assembly

ASI: the transmission is a digital signal, compressed video signal (for example, mpeg2-t, which is h. 264 code stream) for broadcast television. There are two kinds of MPEG2 video code stream transmission interface standards in the current dvb-c system devices: asynchronous serial interface ASI and synchronous parallel interface SPI. In this article, we will mainly understand ASI signal transmission. ASI comes with serial transmission, only a coaxial cable transmission to deliver simple connection, long transmission distance. ASI can send and receive MPEG2 data at different rates, but with a constant transmission rate of 270Mbps.


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ASI to IP protocol UDP converter is an interface device used for DVB and Ethernet front end. In the program sending part, it can be used for IP Stream transmitter to transfer mpeg-2 format TS to IP Stream UDP Stream. The following keywords are usually searched in search engines: ASI to IP communication, ASI to IP protocol converter, ASI to IP protocol converter, ASI to IP protocol converter, CMMB professional signal transmission equipment.


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ATSC is the Advanced Television Systems Committee. The commission formally adopted the ATSC digital TV national standard on September 15, 1995. The ATSC source code adopts mpeg-2 video compression and ac-3 audio compression. The channel coding adopts VSB modulation and provides two modes: ground broadcast mode (8VSB) and high data rate mode (16VSB). With the continuous development of multimedia transmission services, in order to meet the needs of mobile reception, a new 2VSB mobile reception mode is planned recently.


Since the amount of original video data of digital HDTV is very large, the code rate is over 1Gbps. In order to broadcast HDTV signals in a 6M channel bandwidth, a video compression algorithm with a high compression ratio must be used. ATSC adopts MPEG - 2 video compression. MPEG -- 2 video compression format is divided into 4 levels and 5 categories, from low resolution image to high definition video has more than a dozen formats, among which MP @ HL format fully meets the needs of HDTV broadcasting.


Mpeg-2 video compression adopts motion estimation and compensation, intra-frame prediction and inter-frame prediction coding, DCT transformation coding and entropy coding and other algorithms, and the compression rate can reach 30-50 times. The cost is that mpeg-2 compression algorithm is very computationally expensive. AC - 3 has 5+1 channel encoding, which can be multiplexed into TS stream. Source decoding is the reverse process of encoding, including the demultiplexing of TS and the decompression of audio and video ES. The whole process conforms to the decompression syntax of mpeg-2 and ac-3. HDTV decoding is relatively low, is a tenth of the compression coding.


FM Radio Assembly Factory

Many years ago, as for both smart phones and feature phones, manufacturers like to provide FM radio function, as the earliest means of transmission of information is very practical, and even become an important selling point of major mobile phone manufacturers, but now it seems that fewer and fewer smartphones are equipped with this function. However, it is not because current phones are not supported on hardware, but mostly due to disabled software.


So why is that? At present, most smart phones do not have FM antenna. If earphones are used as antenna, earphones must be plugged in and the signal is not good, which will affect user experience. The use of internal antenna will affect the size of the phone, the appearance of the design, and then affect the user experience. In addition, FM radio audio does not offer much of an advantage over telephone sound quality, and the quality of audio provided by online radio stations is relatively high. In addition, most of the radio stations are commercial stations, in which every hour, 1/3 of the time is playing all kinds of advertisements, rather than news or music, which is very difficult to endure for the users who read video and browse the web.


The development of new broadcasting technology also accelerates the disappearance of the function of mobile FM radio. According to a survey by Samsung, users are now using digital broadcasting platforms instead of FM radios, and listening to music or programs via social apps or video and audio websites. Therefore, Samsung has not added FM radio function to the new phones. At the same time, the development prospect of traditional FM radio is not clear. Norway, for example, announced last may that a national FM station would stop broadcasting in 2017. After FM radio is shut down, Norway will adopt the industry's mainstream DAB digital broadcasting technology and online broadcasting services. The demise of FM radio marked the end of an era.


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