【正文】 t terminals I, 2, 3 and S are remained unchanged. Terminals B, D and H should be remained at low level to ensure that the corresponding readout is cleared to zero while unblanking the display. 二、 中文翻譯 1 .導(dǎo)言 在不發(fā)達(dá)的國家， 早上 把人們 從他們家 送到 工作 的地方，然后下午送回來 已成為一個大問題，尤其是在大城市 。ABSTRACT 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。waiting time according to the number of passengers hiring the taxicab. In the following part and as an example, we will present a plete design for a threechannel taximeter. Block diagrams as well as detailed circuit diagrams of the experimental threechannel taximeter are also included. A prototype has been built under grant from the Egyptian Academy for Scientific and Technological Research. 2. AN EXPERIMENTAL THREECHANNEL TAXIMETER Theory of operation of our experimental device to work as an electronic digital taximeter is based on t h e fact thathe speedometer cable rotates one revolution for each meter of travelling distance. Accordingly, if the speedometer cable is coupled with a speed sensor that generates a single pulse for each meter of travelling distance, then our taximeter could be three up counter modules associated with a speed sensor unit. However, our experimental taximeter is not simply a three display readouts. As a matter offact it contains logic circuits that automatically changes the fare per kilometer of travell