| 摘要 |
PURPOSE:To eliminate the effect of the rotary system of the tape recorder and thus to ensure the normal demodulation by securing the simultaneous recording for the carriers obtained through operation of the demodulator on different tracks when recording the modulated waves. CONSTITUTION:As terminal a-c is connected to switches 20 and 21 at the recording time, the modulated waveform after passing through AGC circuit 7 is given to right channel input A of stereo tape recorder 19. while the output of demodulating carrier reproduction circuit 15 is applied to left channel input C. At the reproduction time, terminal b-c is connected to switches 20 and 21 with switch 22 opened, and thus the modulated waveform delivered from right channel output B of recorder 19 is supplied to modulation circuits 8 and 10 plus timing extraction circuit 17. At the same time, the demodulated carrier reproduced from left channel output D of 19 is supplied to phase shift circuit 16 as well as modulation circuit 10. Even in this case, each circuit has the same operation as the recording time, thus obtaining both the reception signal and reception timing signal from the reproduced waveform. |
