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)-文庫吧
2025-04-17 06:54 本頁面
【正文】 盤條目是經(jīng)由函數(shù)調(diào)用磁盤的時間操作系統(tǒng) (DOS 操作系統(tǒng) )。 在自動模式下 ,提供一個程序標記組成的采樣點 42 之前。一個 32 位的模板是由第一個最低有效位 32分的標記。最重要的每一個采樣點的觀點是旋轉(zhuǎn)成一個 32 位的一對寄存器和對比模板。這在比較了兩個階段。僅當?shù)谝粋€ 16 位比賽 ,其他的 16 位比較。因為 ,因為真實的 數(shù)據(jù) ,最低有效位基本上是隨機的 ,一個16位比賽時發(fā)生的頻率大約在 216 年一次每 秒。如果一個特定數(shù)目的一半比賽發(fā)生在總找到匹配的子程序中流產(chǎn)返回一個錯誤代碼。如果一個總找到匹配的數(shù)據(jù)收藏是開始。前兩個點 (對應(yīng)這 33rd 和 34th 分漏掉標記 )。這未來的8點是 :以一個數(shù)組的形式存儲在馬上 preceeds 陣列的數(shù)據(jù)在內(nèi)存中。我們建議調(diào)用程序確認這些 8 點都是相同的到最后的 8分 42point 標記。 此后 ,點中存儲的數(shù)據(jù)的數(shù)組。完成的控制 ,通過使用錄像機的位元第六條、第七條的規(guī)定的港口 C 8255。這些都是沒有要 求握手 ,編程為輸出。 7442BCDtoDecimal 轉(zhuǎn)換器是用來 demultiplex 這些兩位。代碼 C6 C7 = 00,03,和 10 個激活玩 ,停止 ,收、功能 ,分別。位 C C7 通常設(shè)定 ,導致任何行動。當一方或兩位被復位 ,適當?shù)妮敵龅?7442 驅(qū)使低 ,激活相應(yīng)的 4 N36 optoisolator。一個軟件定時器是用來控制的時間 optoisolator 激活與時間之間錄像機的命令。我們也觀察到的唯一缺陷測試接口調(diào)用子程序偶爾的失敗來偵測標記。這發(fā)生 1%的時間。通常 ,一個第二給同一標記子程序執(zhí)行正確的。我 們相信這次失敗源于誤讀錄像。 作者將很高興提供感興趣的讀者與磁盤拷貝的列在圖二子程序和它的組裝目標代碼。有這樣要的的朋友在郵寄是請在郵件里放上格式化好的軟盤。 參考 : Bezanilla,f . 1985。 一個高容量的數(shù)據(jù)記錄設(shè)備的基于數(shù)字音頻處理器和一個視頻盒式錄音機。雜志。J。 47:437 441。 A MICROCOMPUTER INTERFACE FOR A DIGITAL AUDIO PROCESSORBASED DATA RECORDING SYSTEM THOMAS L. CROXTON, STANLEY J. STUMP, AND WILLIAM McD. ARMSTRONG Department ofPhysiology and Biophysics, Indiana University School ofMedicine, Indianapolis, Indiana 46223 ABSTRACT An inexpensive interface is described that performs direct transfer of digitized data from the digital audioprocessor and video cassette recorder based data acquisition system designed by Bezanilla (1985, Biophys. J.,47:437441) to an IBM PC/XT microputer. The FORTRAN callable software that drives this interface is capableof controlling the video cassette recorder and starting data collection immediately after recognition of a segment ofpreviously collected data. This permits piecewise analysis of long intervals of data that would otherwise exceed thememory capability of themicroputer. The high capacity data recording system designed by (1985) is of great value to practitioners ofsinglechannel recording since it allows storage of two channels of very precise data (16 bit resolution), sampled at an acceptably fast rate (44,100 samples/s), for extended periods of time (up to 3 h). We have, however, encountered technical problems which limit the puterized analysis of data recorded in this way. In particular, when the data are played back it is difficult to accurately or reproducibly select a given interval of data for storage in puter memory. This difficulty prompted us to develop an interface between Bezanilla39。s data recording system and the model PC/XT microputer (IBM Instruments Inc., IBM Corp., Danbury, CT). The interface described herein is capable of retrieving the same interval of data repeatedly and of retrieving contiguous intervals. The latter capability allows analysis of single channel records which greatly exceed in duration the data storage capacity of the puter(6 s data per 512 kbytes memory). Our interface consists of a switch box that selects the left or right channel for sam
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