【正文】 其他端口，如 D，H端口保持不變 。第二個(gè)改變將中斷連接到圖 10C的輸入端，輸出端 Q連接速度的電路。 以順時(shí)針?lè)较蛐D(zhuǎn)所選擇的開(kāi)關(guān)將提供相應(yīng)的顯示，這可以通過(guò) 5伏電壓來(lái)分別控制 1，第 2和 3終端。 它由一個(gè)反 向 計(jì)數(shù)器 7493構(gòu)成 ，其中一半是雙 JK主從觸發(fā)器電路，型號(hào)為 7476，包括三個(gè)變頻器，三個(gè) 2輸入與門，一個(gè) 3輸入與門， 1 2輸入或門以及一個(gè) 3輸入或門。 表 2 這個(gè)環(huán)路，在這種情況下，應(yīng)提供單脈沖的輸出 M的每 100， 125或143脈沖所產(chǎn)生的輸入端根據(jù)級(jí)別的電壓輸入終端 3， K或 L。這個(gè)組里的任意乘客都是一組相關(guān)的人。在充分逆時(shí)針的立場(chǎng)，反相應(yīng)的讀出是未標(biāo)明和殘疾人。出租車的 終端 電壓在終端 Q將高電壓降為零。該裝置可能會(huì)分成兩個(gè)主要部分組成：第一是速度傳感器，這個(gè)傳感器可位于任何地方，在出租車內(nèi)進(jìn)行這樣一個(gè)簡(jiǎn)單的耦合車速電纜是可以實(shí)現(xiàn)的。 在下面的部分，我舉出一個(gè)例子，我們將介紹一個(gè)完整的三通道計(jì)價(jià)。一項(xiàng)在出租車司機(jī)和車主之間的協(xié)議已經(jīng)達(dá)成，司機(jī)應(yīng)保證每天固定收入，以及向業(yè)主支付燃料以及維修的費(fèi)用。 因 此，依靠目前的傳統(tǒng)的單 車 道計(jì)價(jià)以確定所需的票價(jià)，把每個(gè)乘客 的計(jì)費(fèi)分開(kāi) ， 這已成為 一個(gè) 非常困難的問(wèn)題。ABSTRACT In this paper, a multichannel taximeter that is able to deal with more than one passenger simultaneously is proposed. In order to demonstrate the theory of operation of the proposed system, a plete design for an experimental threechannel taximeter (whose prototype has been built under grant from the Egyptian Academy for Scientific and Technological Research) is presented. System location, outline, block diagrams as well as detailed circuit diagrams for the experimental taximeter are also included. 1. INTRODUCTION Transporting people in the morning from their homes to their works and back in the afternoon has bee a big problem in big cities especially in undeveloped countries. As a partial solution of this problem, the authorities in some countries had, unofficially, left the taxicab drivers to carry different passengers to different places at the Same time. For example, a taxicab with four seats may carry four different passengers without any relation between them except that their way of travelling is the same. Accordingly, it has bee very difficult to rely on the present conventional singlechannel taximeter to determine the fare required from each passenger separately. Accordingly, an unfair financial relation was created between the taxicab driver, owner, passengers and the state taxation department. Under these circumstances, taxicab drivers force the passengers to pay more than what they should pay. In some cases passengers had to pay double fare they should pay. With the present conventional singlechannel taximeter, taxicab owners are not able to determine the daily ine of their taxicab. In some cases (a taxicab with four seats) they may only get one quarter of the ine of the taxicab (collected by the taxicab driver). From which they should pay the salary of the taxicab driver as well as the cost of fuel, minor and major repairs in addition to the car depreciation. As a matter of fact the position of the taxicab owners is not so bad as it seems. A general agreement has been reached between the taxicab drivers and owners such that the drivers should guarantee a fixed daily ine to the owners as well as the paying for the cost of fuel as well as the minor repaires. Even though the taxicab drivers still share the large portion ofthe ine of the taxicab. Also with the presence of the singlechannel taximeter, it has bee very difficult for the state taxation department to know the yearly ine of the taxicab and accordingly it has bee very difficult to estimate the taxes to be paid by the taxicab owners. In order to face this problem, the state taxation department had to impose a fixed estimated taxes for each seat of the taxicab whatever the ine of the taxicab. In this paper, we introduced a multichannel taximeter that can deal with more than one passenger simultaneously. I t should be pointed out that by the term passenger we mean a one person or a group of related persons. I t should also be pointed out that our proposed multichannel taximeter is not, simply, a multi display readouts. As a matter of fact it contains logic circuits that automatically changes the fare per killometer of travelling distance or per minutes of 39。因此，在出租車司機(jī)， 車主，乘客和國(guó)家稅務(wù)部門之間 存在著 不公平的 財(cái)政 關(guān)系。即使如此，還是有的出租車司機(jī)的很大一部分份額之收入的出租車。 框圖以及詳細(xì)的電路圖，實(shí)驗(yàn)三通道計(jì)價(jià)功能也包括在內(nèi)。 單位包含了主要的電子電路，顯示器以及控制 面板。這電壓可作為改變出租車從距離計(jì)費(fèi)到時(shí)間計(jì)費(fèi)方式的開(kāi)關(guān)電壓。以順時(shí)針?lè)较騽t是未定義的，清除為零，對(duì)于第一第二第三的乘客分別計(jì)費(fèi)。當(dāng)一個(gè)乘客進(jìn)入出租車后，我們只是表示這樣一種情況，自由讀出顯示在談到相應(yīng)的旋轉(zhuǎn)選擇開(kāi)關(guān)，以一個(gè)完全順時(shí)針?lè)较颉? 我們的電路按圖 5顯示，三個(gè)十年的計(jì)數(shù)器，作為一個(gè)三位數(shù)分頻器的分比率 100 ， 125和 143個(gè)自動(dòng)選定的電壓一級(jí)終端 J ， K和 L分別。當(dāng)脈沖引起在輸入的終端 N或 M，觸發(fā)器的輸入 Q上將產(chǎn)生高級(jí)電壓。對(duì)應(yīng)的顯示通過(guò)供應(yīng)低級(jí)電壓通過(guò)終端 A