| 摘要 |
PURPOSE:To form a nonadjusting delay circuit, by setting the inductance value of the matching coil connected to the acoustic delay line, to a larger point than the point of inflection of the delay time variation curve as to the delay line inductance. CONSTITUTION:The inductance value of the matching coils 2, 2' connected in parallel to the acoustic delay line 1 is set as follows. That is to say, the inductance to be adopted corresponds to the area which is almost flat and on the right of the point of inflection H of the delay time variation curve as to inductance of the coil. According to this constitution, the delay time error caused by the variations in inductance of the coils 2, 2' becomes very small, and the delay time error of the acoustic delay line becomes the delay time error of the whole circuit. Accordingly, in this way, a nonadjusting delay circuit is formed. |
