| 摘要 |
PURPOSE:To cancel a crosstalk signal and to eliminate the noise uncomfortable for a user by shaping the waveform of a signal supplied to a time code recording head into a signal waveform approximating the waveform of the crosstalk signal to an audio simultaneous reproducing head. CONSTITUTION:A time code signal in the TTL level from an input terminal 1 of the time code is amplified by an amplifier 2 and is supplied to a time code recording head 108T and is not only recorded on a tape T but also supplied to an input terminal 31 of a waveform shaping circuit 3. This signal has the waveform inverted for phase combination by a transistor TR 33 of the circuit 3 and is applied to a differentiating circuit consisting of diodes 39 and 40, a capacitor 35, resistors 36 and 37, etc. and has the waveform shaped into a signal approximating the crosstalk signal from the head 108T to an audio simultaneous reproducing head 109A. This signal has the level adjusted by a variable resistance 38 and is applied to a reproducing circuit 5 through a TR 41 from an output terminal 45. Crosstalk components from the head 109A are eliminated by an amplifier 52 of the circuit 5, and the signal is outputted to an output terminal 6. |
