| 摘要 |
PURPOSE:To display the proper recording level for each frequency band and each type of the tape, by providing a means to switch the set voltage between a BPF and a comparator for every type of the tape at the front stage of a voltage comparator where the detected and rectified voltage of a recording signal input is inputted to. CONSTITUTION:The recording signal applied to an input terminal 1 is fed to a recording head 4 via the amplifiers 2 and 3. The output of the amplifier 2 is applied to an amplifier 5 via a BPF16. The plus input terminal of a voltage comparator 10 is connected to the output of the amplifier 5 via a rectifying diode 6 and also earthed via a capacitor 7. The input terminal of one side of the comparator 10 is connected to a power supply VCC via a resistance R8 and then to the terminals a-d of a tape changeover switch 15 via the resistances R9 and R12-R14. The output of the comparator 10 is fed to a display device, i.e., a light emitting diode. In such way, the recording level can be checked by limiting the high frequency component only. Furthermore the level can be set in accordance with the type of the tape. |
