| 摘要 |
PURPOSE:To attain the enjoyment of stereo phonic reproduction rich in the feeling of an impression to be present in a music hall by constituting the device that delay output of each odd number of the 1st and the 2nd echo generating means in opposite in phase and the delay output of each even number is in phase. CONSTITUTION:The attenuating characteristic of all attenuators is equal and they are interlocked, and the waveform of signals A-C of the 1st echo generating means 10 is as shown in Figs. A-C. assuming the delay time of the attenuation 11, 12 to 13tau. In the 2nd echo generating section 20, the echo output of the odd number is in phase with the input and the echo of the even number is opposite in phase the input. In using the two systems of the echo generating sections 10, 20 different from the echo output characteristic, for example, the frequency of audible range is applied from an input section (output section of adder 1) and said input frequency is swept for change, then the phase difference frequency characteristic is changed complicatedly over the range of 0-360 deg., alloing to obtain an echo with spread. |
