DX發(fā)射機音頻系統(tǒng)板卡測試平臺設計與應用
發(fā)布時間：2019-07-02 15:15
【摘要】：廣播,作為一種獲取外界信息的媒介已被大眾熟知。十九世紀中葉,電話的誕生為廣播的創(chuàng)始打下了堅實的技術基礎。之后,廣播的發(fā)展之路迅速開拓起來,世界各地的廣播電臺陸續(xù)建立,這給人們的生活及工作帶來的便捷是無可替代的。隨著科學技術的不斷發(fā)展,廣播的形式也是日漸多樣化:局域性受限的有線廣播發(fā)展為收聽范圍廣泛的無線廣播;之前廣播的設備為分立元器件,而如今發(fā)展為集成一體化的設備;之前的模擬信號廣播發(fā)展為如今的數(shù)字信號廣播;發(fā)射機元器件控制方式由原來的繼電器逐一獨立控制變化為現(xiàn)在的可編程時序邏輯控制器PLC;而今更智能、更快捷的網(wǎng)絡方式廣播也逐漸被人們所知,出現(xiàn)在人們的生活中。特別在近幾年,我國的無線廣播經(jīng)過幾代人的努力,主要設備已經(jīng)完成了技術改造。無線廣播的播音工作已經(jīng)走上持續(xù)穩(wěn)定的成熟發(fā)展道路。我們機房有3臺DX-200型號的發(fā)射機,每個DX-200功率單元(PB)中音頻系統(tǒng)由模擬輸入板,A/D轉(zhuǎn)換板、調(diào)制編碼板組成。而這三塊板卡及其備份板卡所需用量都不少,特別是每部發(fā)射機上都要使用到7塊調(diào)制編碼板。如果是6并機(DX-1200)的情況,最高使用量可達四十二塊板卡之多,而DX所有板卡均為美國HARRIS公司生產(chǎn)的,每年備份板卡的需求數(shù)量相當大,如果全部從國外進口的話,首先是訂貨的周期很長,往往設備出現(xiàn)了故障但備份板卡卻還沒到貨,從而影響傳輸發(fā)射的安全,其次是費用很高而且售后服務不能及時到位,于是我們承接了研發(fā)DX機部分板卡的任務。但是我機房的播音任務很重,沒有足夠的時間讓這些板卡上機測試,我臺歷來就有著勇于自主創(chuàng)新的精神,因此又自主研發(fā)了DX音頻系統(tǒng)測試平臺,此平臺模擬了發(fā)射機音頻系統(tǒng)設計,讓我們生產(chǎn)的板卡的性能在不上機的情況下就能得到測試。這個測試平臺處理方式由三方面來完成:音頻源處理、射頻輸入源處理以及所需的電源處理。我臺自主研發(fā)的DX音頻系統(tǒng)測試平臺很大程度地節(jié)約了發(fā)射機的日常維護成本,同時又不會影響發(fā)射機的播音質(zhì)量。而且備份板卡的測試從此不再受到播音時間的限制,從而提高了板卡國產(chǎn)化生產(chǎn)的效率。在該測試平臺投入使用后,不再需要上機對備份板卡進行測試,這樣避免了上機測試時插拔過程影響到其他部件,非常有效地保障了發(fā)射機的播音安全,同樣保證發(fā)射機的各項電聲指標能夠達到行業(yè)的甲級水平,并且播音效果非常優(yōu)良。
[Abstract]:The broadcast, as a medium for obtaining external information, has been well known to the public. In the middle of the nineteenth century, the birth of the telephone set a solid technical basis for the founding of the radio. After that, the development path of broadcasting has been developed rapidly, and the radio stations around the world have been set up in succession, which can bring convenience to people's life and work. With the development of science and technology, the form of broadcasting is becoming more and more diverse: local limited cable broadcasting is developed to listen to a wide range of radio broadcasts; the previously broadcast equipment is a discrete component, and is now developed into an integrated and integrated device; the prior analog signal broadcasting is developed into the present digital signal broadcasting; the control mode of the transmitter and the device is changed from the original relay one by one to the present programmable timing logic controller PLC; and now, the more intelligent and faster network mode broadcasting is gradually known, It's in people's lives. In recent years, especially in recent years, the wireless broadcasting of our country has undergone several generations' efforts, and the main equipment has completed the technical transformation. The broadcasting of radio broadcasting has been on a sustainable and stable development path. We have three DX-200 models in our computer room, and the audio system in each DX-200 power unit (PB) consists of an analog input board, an A/ D conversion board, and a modulation coding board. And the required amount of the three board cards and the backup boards of the three boards is not less, and in particular, seven modulation coding boards are to be used on each transmitter. If it is the case of the 6-parallel machine (DX-1200), the maximum usage amount can reach as much as forty-two block boards, and the DX all board cards are manufactured by the HARRIS company in the United States, and the demand quantity of the backup board per year is relatively large, and if all imported from the foreign countries, first, the order is long, As a result, the equipment has failed but the backup board has not arrived, thus affecting the safety of the transmission and transmission, and the second is the high cost and the after-sales service cannot be in place in time, so that we have undertaken the task of developing the part of the board of the DX machine. However, the broadcasting task of my machine room is very heavy, there is not enough time to test the board, and I have always had the spirit of self-innovation, so I developed the DX audio system test platform independently, this platform simulates the design of the transmitter audio system, The performance of the board produced by us can be tested without being on the machine. This test platform process is accomplished by three aspects: audio source processing, radio frequency input source processing, and required power processing. The self-developed DX audio system test platform greatly saves the daily maintenance cost of the transmitter and does not affect the broadcasting quality of the transmitter. And the test of the backup board card is no longer limited by the broadcasting time, so that the production efficiency of the localization of the board is improved. after the test platform is put into operation, the machine is no longer required to test the backup board card, The invention also ensures that the various electroacoustic indexes of the transmitter can reach the first-class level of the industry, and the broadcasting effect is very good.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN934.81
本文編號：2509039
[Abstract]:The broadcast, as a medium for obtaining external information, has been well known to the public. In the middle of the nineteenth century, the birth of the telephone set a solid technical basis for the founding of the radio. After that, the development path of broadcasting has been developed rapidly, and the radio stations around the world have been set up in succession, which can bring convenience to people's life and work. With the development of science and technology, the form of broadcasting is becoming more and more diverse: local limited cable broadcasting is developed to listen to a wide range of radio broadcasts; the previously broadcast equipment is a discrete component, and is now developed into an integrated and integrated device; the prior analog signal broadcasting is developed into the present digital signal broadcasting; the control mode of the transmitter and the device is changed from the original relay one by one to the present programmable timing logic controller PLC; and now, the more intelligent and faster network mode broadcasting is gradually known, It's in people's lives. In recent years, especially in recent years, the wireless broadcasting of our country has undergone several generations' efforts, and the main equipment has completed the technical transformation. The broadcasting of radio broadcasting has been on a sustainable and stable development path. We have three DX-200 models in our computer room, and the audio system in each DX-200 power unit (PB) consists of an analog input board, an A/ D conversion board, and a modulation coding board. And the required amount of the three board cards and the backup boards of the three boards is not less, and in particular, seven modulation coding boards are to be used on each transmitter. If it is the case of the 6-parallel machine (DX-1200), the maximum usage amount can reach as much as forty-two block boards, and the DX all board cards are manufactured by the HARRIS company in the United States, and the demand quantity of the backup board per year is relatively large, and if all imported from the foreign countries, first, the order is long, As a result, the equipment has failed but the backup board has not arrived, thus affecting the safety of the transmission and transmission, and the second is the high cost and the after-sales service cannot be in place in time, so that we have undertaken the task of developing the part of the board of the DX machine. However, the broadcasting task of my machine room is very heavy, there is not enough time to test the board, and I have always had the spirit of self-innovation, so I developed the DX audio system test platform independently, this platform simulates the design of the transmitter audio system, The performance of the board produced by us can be tested without being on the machine. This test platform process is accomplished by three aspects: audio source processing, radio frequency input source processing, and required power processing. The self-developed DX audio system test platform greatly saves the daily maintenance cost of the transmitter and does not affect the broadcasting quality of the transmitter. And the test of the backup board card is no longer limited by the broadcasting time, so that the production efficiency of the localization of the board is improved. after the test platform is put into operation, the machine is no longer required to test the backup board card, The invention also ensures that the various electroacoustic indexes of the transmitter can reach the first-class level of the industry, and the broadcasting effect is very good.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN934.81
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