isdb 中文意思是什麼
isdb
解釋
國際發育生物學家學會-
The standard, which was designed as a fully - digitised television broadcasting system in 1994, is only used in japan. indeed, the technology is capable of transmitting multiple television channels, multimedia service and tele - text data at the same time. radio broadcast is one of the functions that can be supported by isdb
Isdb是由日本放送協會（ nhk ）的放送技術研究所（ science & technicalresearchlaboratories ， strl ）在1994年開始研發的全數碼化電視廣播系統，現時只有在日本當地使用，它是一種能夠傳送多頻道電視節目、多媒體服務，以及其他包含圖像文字等資料的數碼廣播系統，電臺聲音廣播只是它的其中一個功能。 -
As the step of the color tv ( the second generation ) to the digital tv ( the third generation ) is larger and larger, the research of digital television terrestrial broadcasting ( dttb ) become more and more important in china, we are concentrating on the standard of dttb which is suit for our country after describing and analyzing the technical stipulation and speciality of dttb, this paper compares atsc 8 - vsb with dvb - t cofdm and isdb - t bst - ofdmo the emphasis of this article lies in the technical solution about transferring system, channel coding is important component of dttb, which can resist from the bad circumstances o because of lots of varieties and different performance, channel coding become one of the emphasis of the research work this paper analyzes and researches the theory and performance of the different channel coding particularly, points out an effective theoretic analysis method and computer demo of performance comparison a theoretical method for estimating the performance of concatenated codes is proposed in this paperc this is achieved by combining the performance of single level coding rayleigh fading channel and the character of channel modulation it may be useful to research and development of the future digital television terrestrial broadcasting standard of our country
通道糾錯編碼是數字電視地面廣播傳輸系統的重要組成部分，是抵禦地面惡劣環境的有效手段。由於通道編碼的種類繁多，性能各異，因此是目前研究工作的重點之一。本文詳細分析和研究了幾種通道糾錯編碼的原理和性能，並針對外碼內碼級聯糾錯結合地面通道瑞利衰落提出了一種有效的理論分析方法和性能的計算機比較演示方案，總結了不同級聯方案的性能特點，對於我國目前的數字電視地面廣播標準的研究和通道級聯糾錯方案的確立及其參數選擇具有一定的參考價值。 -
The use of mpeg - 2 aac compression and multiplex technologies makes it possible to transmit signals through satellite, terrestrial and mobile means. as a unique feature, isdb permits user to receive a low - resolution edition in favour of better mobile reception. in an interference - free environment, viewers may choose to receive a high - resolution edition for better picture and sound quality
它使用以mpeg - 2aac壓縮編碼與多工技術，可以透過衛星、有線與地面無線等不同傳輸媒體播送； isdb有一個較其它系統獨特的功能，就是聽眾可以選擇接收低解像度的訊號，來換取良好的流動接收效果，而在無干擾情況下，又可以選擇接收高解像度的訊號，來享受高質的視聽效果。 -
Isdb integrated services digital broadcasting
綜合業務數字廣播 -
Digital sound broadcasting is a general term covering a wide range of systems and technologies, including eureka 147 and isdb - t, which are designed to replace frequency modulation broadcasting, digital radio mondiale, a possible successor to amplitude modulation, as well as iboc, which is intended to complement the existing am and fm services
數碼聲音廣播?是一個統稱，技術上是分為不同的系統和制式，有取代fm廣播的eureka 147和isdb - t ，也有針對am廣播的drm ，和可以與am fm並存的iboc等系統，它們都有一個共通點，是現時的收音機並不適用。 -
Digital sound broadcasting is a general term covering a wide range of systems and technologies, including eureka 147 and isdb - t, which are designed to replace frequency modulation ( fm ) broadcasting, digital radio mondiale ( drm ), a possible successor to amplitude modulation ( am ), as well as iboc, which is intended to complement the existing am and fm services
數碼聲音廣播?是一個統稱，技術上是分為不同的系統和制式，有取代fm廣播的eureka147和isdb - t ，也有針對am廣播的drm ，和可以與amfm並存的iboc等系統，它們都有一個共通點，是現時的收音機並不適用。
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