CCE digital currency
Publish: 2021-05-01 11:50:55
1.
reliable, the shell trading platform specially develops a bank management system to solve the problem. All the bank's loan policies are recorded in the system in a very detailed and structured way. When we input the real estate information and customer information, we can realize the intelligent matching of bank selection
extended data
in order to meet the needs of different cities and partners, shell trading platform adopts the "LEGO style" and configuration proct mode, which can quickly and accurately support different real estate trading modes in multiple cities and regions, allowing store owners and brokers to choose appropriate trading professional tools according to local business characteristics
it's like Lego's idea of assembling standard parts one by one, running all the urban processes, concentrating and abstracting, and turning them into a configurable system. Every field becomes every node, every node becomes a process, every process becomes a trading proct, becomes a trading solution, and builds up layer by layer
there are more than 40 cooperative banks in shell trading platform, among which there are 8 (ICBC, Bank of China, Everbright Bank, CITIC Bank, instrial bank, Bank of Beijing, Bank of Hangzhou, Bank of Xi'an)
2. The full name of MP3 is moving picture experts group audio layer III. It is a popular digital audio coding and lossy compression format. It is designed to greatly rece the amount of audio data. For most users, the quality of playback audio is not significantly reced compared with the original uncompressed audio. It was invented and standardized in 1991 by a team of engineers from Fraunhofer Gesellschaft, a research organization in Erlangen, Germany
simply speaking, MP3 is an audio compression technology, because the full name of this compression method is MPEG audio layer3, so people call it MP3 for short. Mp3 makes use of the technology of MPEG Audio Layer 3 to compress music into smaller files at a compression rate of 1:10 or even 1:12. In other words, it can compress files to a smaller extent when the loss of sound quality is very small. But also very good to maintain the original sound quality. Because of its small size and high sound quality, MP3 format has almost become the synonym of online music. The MP3 format of music per minute is only about 1MB, so the size of each song is only 3-4 megabytes. MP3 player is used to decompress (decode) MP3 files in real time. In this way, high-quality MP3 music will be played
mp3 is a data compression format. It discards the data that is not important to human hearing in pulse code molation (PCM) audio data (similar to JPEG is a lossy image compression), thus achieving a much smaller file size
many techniques are used in MP3, including psychoacoustics, to determine which part of the audio can be discarded. Mp3 audio can be compressed at different bit rates, providing a range of trade-offs between data size and sound quality
according to the MPEG specification, AAC (Advanced Audio Coding) in MPEG-4 will be the next generation of MP3 format, although there are many important efforts to create and promote other formats. However, e to the unprecedented popularity of MP3, the success of any other format is unlikely at present. Mp3 not only has a wide range of client software support, but also has a lot of hardware support, such as portable media player (MP3 player), DVD and CD player. MP3 player is different from DVD player
MP3 format features
1. MP3 is a data compression format< It discards the data that is not important to human hearing in PCM audio data (similar to JPEG is a lossy image compression), so as to achieve a much smaller file size
3. MP3 audio can be compressed at different bit rates, providing a range of trade-offs between data size and sound quality. MP3 format uses a hybrid conversion mechanism to convert time domain signal into frequency domain signal
4.32 band polyphase integral filter (PQF)
5.36 or 12 tap modified discrete cosine filter (MDCT); The size of each sub band can be selected independently between 0... 1 and 2... 31
6. MP3 not only has a wide range of client software support, but also has a lot of hardware support, such as portable media player (MP3 player), DVD and CD player<
the development of MP3
MPEG-1 Audio Layer 2 coding started with German Deutsche forschungs und versuchanstalt F ü R Luft und Raumfahrt (later known as Deutsches Zentrum F ü R Luft und Raumfahrt, German Space Center) Egon Meier engelen. This project is funded by the European Union as the Eureka research project, and its name is usually called eu-147. Eu-147 was studied from 1987 to 1994< In 1991, there were two proposals: MUSICAM (layer 2) and aspec (adaptive spectrum sensing entropy coding). Philips of the Netherlands, ccett of France and institut F of Germany ü MUSICAM method proposed by rundfunktechnik is selected because of its simplicity, robustness in case of error and less computation in high quality compression. MUSICAM format based on subband coding is a key factor to determine the MPEG audio compression format (sampling rate, frame structure, data header, sampling point per frame). This technology and its design idea are fully integrated into the definition of ISO MPEG audio layer I, II and later layer III (mp3) format. Under the leadership of Professor Mussmann (University of Hannover), the standard was developed by Leon Van de Kerkhof (layer I) and Gerhard Stoll (layer II)<
a team composed of Leon Van de Kerkhof of the Netherlands, Gerhard Stoll of Germany and Yves Fran & ccedil of France; The working group formed by OIS dehery and Germany's Karlheinz Brandenburg absorbed the design ideas of MUSICAM and aspec, and added their own design ideas to develop MP3. Mp3 can achieve MP2 192kbit / s sound quality at 128kbit / s< All these algorithms eventually became part of the first standard group MPEG-1 of MPEG in 1992, and proced the international standard ISO / IEC 11172-3 published in 1993. Further work on MPEG audio eventually became a part of the second MPEG standard group MPEG-2, which was formulated in 1994. The formal name of this standard is ISO / IEC 13818-3, which was first published in 1995
the compression efficiency of an encoder is usually defined by the bit rate, because the compression rate depends on the bit (: en: bit depth) and the sampling rate of the input signal. However, some procts often use the CD parameter (44.1KHz, two channels, 16 bits per channel or 2x16 bits) as the compression ratio reference. The compression ratio using this reference is usually higher, which also shows the problem of compression ratio for lossy compression
Karlheinz Brandenburg used Suzanne Vega's song Tom's diner on CD media to evaluate MP3 compression algorithm. This song is used because its soft and simple melody makes it easier to hear the defects in the compressed format when playing back. Some jokingly call Suzanne Vega "the mother of MP3.". More serious and critical audio clips (glockenspiel, triangle, accordion...) from EBU V3 / SQAM reference CD are used by professional audio engineers to evaluate the subjective quality of MPEG audio format
so why MP4
simply speaking, MP3 is an audio compression technology, because the full name of this compression method is MPEG audio layer3, so people call it MP3 for short. Mp3 makes use of the technology of MPEG Audio Layer 3 to compress music into smaller files at a compression rate of 1:10 or even 1:12. In other words, it can compress files to a smaller extent when the loss of sound quality is very small. But also very good to maintain the original sound quality. Because of its small size and high sound quality, MP3 format has almost become the synonym of online music. The MP3 format of music per minute is only about 1MB, so the size of each song is only 3-4 megabytes. MP3 player is used to decompress (decode) MP3 files in real time. In this way, high-quality MP3 music will be played
mp3 is a data compression format. It discards the data that is not important to human hearing in pulse code molation (PCM) audio data (similar to JPEG is a lossy image compression), thus achieving a much smaller file size
many techniques are used in MP3, including psychoacoustics, to determine which part of the audio can be discarded. Mp3 audio can be compressed at different bit rates, providing a range of trade-offs between data size and sound quality
according to the MPEG specification, AAC (Advanced Audio Coding) in MPEG-4 will be the next generation of MP3 format, although there are many important efforts to create and promote other formats. However, e to the unprecedented popularity of MP3, the success of any other format is unlikely at present. Mp3 not only has a wide range of client software support, but also has a lot of hardware support, such as portable media player (MP3 player), DVD and CD player. MP3 player is different from DVD player
MP3 format features
1. MP3 is a data compression format< It discards the data that is not important to human hearing in PCM audio data (similar to JPEG is a lossy image compression), so as to achieve a much smaller file size
3. MP3 audio can be compressed at different bit rates, providing a range of trade-offs between data size and sound quality. MP3 format uses a hybrid conversion mechanism to convert time domain signal into frequency domain signal
4.32 band polyphase integral filter (PQF)
5.36 or 12 tap modified discrete cosine filter (MDCT); The size of each sub band can be selected independently between 0... 1 and 2... 31
6. MP3 not only has a wide range of client software support, but also has a lot of hardware support, such as portable media player (MP3 player), DVD and CD player<
the development of MP3
MPEG-1 Audio Layer 2 coding started with German Deutsche forschungs und versuchanstalt F ü R Luft und Raumfahrt (later known as Deutsches Zentrum F ü R Luft und Raumfahrt, German Space Center) Egon Meier engelen. This project is funded by the European Union as the Eureka research project, and its name is usually called eu-147. Eu-147 was studied from 1987 to 1994< In 1991, there were two proposals: MUSICAM (layer 2) and aspec (adaptive spectrum sensing entropy coding). Philips of the Netherlands, ccett of France and institut F of Germany ü MUSICAM method proposed by rundfunktechnik is selected because of its simplicity, robustness in case of error and less computation in high quality compression. MUSICAM format based on subband coding is a key factor to determine the MPEG audio compression format (sampling rate, frame structure, data header, sampling point per frame). This technology and its design idea are fully integrated into the definition of ISO MPEG audio layer I, II and later layer III (mp3) format. Under the leadership of Professor Mussmann (University of Hannover), the standard was developed by Leon Van de Kerkhof (layer I) and Gerhard Stoll (layer II)<
a team composed of Leon Van de Kerkhof of the Netherlands, Gerhard Stoll of Germany and Yves Fran & ccedil of France; The working group formed by OIS dehery and Germany's Karlheinz Brandenburg absorbed the design ideas of MUSICAM and aspec, and added their own design ideas to develop MP3. Mp3 can achieve MP2 192kbit / s sound quality at 128kbit / s< All these algorithms eventually became part of the first standard group MPEG-1 of MPEG in 1992, and proced the international standard ISO / IEC 11172-3 published in 1993. Further work on MPEG audio eventually became a part of the second MPEG standard group MPEG-2, which was formulated in 1994. The formal name of this standard is ISO / IEC 13818-3, which was first published in 1995
the compression efficiency of an encoder is usually defined by the bit rate, because the compression rate depends on the bit (: en: bit depth) and the sampling rate of the input signal. However, some procts often use the CD parameter (44.1KHz, two channels, 16 bits per channel or 2x16 bits) as the compression ratio reference. The compression ratio using this reference is usually higher, which also shows the problem of compression ratio for lossy compression
Karlheinz Brandenburg used Suzanne Vega's song Tom's diner on CD media to evaluate MP3 compression algorithm. This song is used because its soft and simple melody makes it easier to hear the defects in the compressed format when playing back. Some jokingly call Suzanne Vega "the mother of MP3.". More serious and critical audio clips (glockenspiel, triangle, accordion...) from EBU V3 / SQAM reference CD are used by professional audio engineers to evaluate the subjective quality of MPEG audio format
so why MP4
3. It is about 300 meters away from niushikou station of Metro Line 2. From niushikou station along the Fifth East section of the first ring road, you can clearly see the location of the project, opposite to Jiuyanqiao brilliant lighting city. At present, the station of Metro Line 2 has been completed and will start trial operation in September 2012. Metro Line 2 will transfer from Metro Line 1 to Tianfu Square.
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