外文翻譯--微型計算機的數(shù)字音頻接口processor-based數(shù)據(jù)記錄系統(tǒng)-資料下載頁
2025-05-12 06:54本頁面
【導(dǎo)讀】ofPhysiology生物部門、印第安納大學(xué)學(xué)校ofMedicine、印第安納波利斯,印地安那州的46223. 式錄音機的基礎(chǔ)數(shù)據(jù)采集系統(tǒng)設(shè)計和Bezanilla(1985年。一個IBM的PC/XT微型計算機。FORTRAN語言的可收回軟件驅(qū)動接口很能干?？刂频匿浺魴C和視頻數(shù)據(jù)采集后,立即開始承認的一個環(huán)節(jié)之前收集的數(shù)據(jù)。使得分段分析數(shù)據(jù)的長的時間間隔,否則將超過記憶能力的微型計算機。高容量的數(shù)據(jù)記錄系統(tǒng)所設(shè)計的F。Bezanilla是很有價值的從業(yè)人。過,遇到限制電腦技術(shù)問題進行了分析這樣的數(shù)據(jù)記錄。尤其是當(dāng)數(shù)據(jù)播放時是。儀器有限公司,IBM公司,Danbury,CT)。后者能力允許單通道記錄分析有很大的影響在。供了一個標(biāo)記42歲的順序,以前采樣數(shù)據(jù)點。較,結(jié)果表明該標(biāo)記物的一部分。功能調(diào)用在自動模式將產(chǎn)量檢索的連續(xù)數(shù)據(jù)塊。這所設(shè)計的數(shù)字輸出階段Bezanilla提供的話時。每一個段落之間的部分增加和偏移登記注冊減少16歲。集停止數(shù)量的段落的數(shù)據(jù)已經(jīng)存儲。是由第一個最低有效位32分的標(biāo)記。16位比賽時發(fā)生的頻率大約在216年一次每秒。
【正文】 by 16. Data collection ceases when the required number of paragraphs of data has been stored. Detection of keyboard entry is made via function calls to the disk operating system (Microsoft DOS). FIGURE 2 MACRO ASSEMBLER source code for control of interface. This subroutine programs the 8255 for data transfer, stores data in microputer memory, and controls the video cassette recorder. Instructions for calling the subroutine and a description of its algorithm are given in the ments. In the automatic mode the program is provided with a marker consisting of 42 previously sampled points. A 32bit template is constructed from the least significantbits of the first 32 points of the marker. The least significant bit of each sampled point is rotated into a 32bit pair of registers and is pared with the template. This parison is done in two stages. Only if the first 16 bits match, are the other 16 bits pared. Since, for real data, the least significant bits are essentially random, a 16bit match occurs with a frequency of 1 in 216 or about once every s. If a specified number of half matches occur before a total match is found the subroutine aborts and returns an error code. If a total match is found data collection is started. The first two points (corresponding to the 33rd and 34th points of the marker) are missed. The next eight points are stored in an array that immediately preceeds the data array in memory. We remend that the calling program verify that these 8 points are identical to the last 8 points of the 42point marker. Thereafter, points are stored in the data array. Control of the VCR is acplished through use of bits 6 and 7 of port C of the 8255. These are not required for handshaking and are programmed for output. A 7442 BCDtoDecimal converter is used to demultiplex these two bits. Codes C6 C7 = 00, 01, and 10 activate the play, stop, and rewind functions, respectively. Bits C6 and C7 are normally set, resulting in no action. When either or both bits are reset, the appropriate output of the 7442 is driven low, activating the corresponding 4N36 optoisolator. A software timer is used to control the duration of optoisolator activation and the period of time between VCR mands. The only defect we have observed in testing this interface is occasional failure of the subroutine to detect the marker. This occurs 1% of the time. Often, a second subroutine call with the same marker will execute correctly. We believe this failure to result from misreading of the video tape. The authors will be pleased to provide interested readers with diskette copies of the subroutine listed in Fig. 2 and its assembled object code. Such requests should include a formatted diskette in a stamped, selfaddressed diskette mailer. Received for publication 23 February 1987 and in final form 17 :Bezanilla, F. 1985. A high capacity data recording device based on adigital audio processor and a video cassette recorder. Biophys. :437441.
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