| 摘要 |
PURPOSE:To prevent the howling in any user's listening room by providing a delay circuit into a signal system of a speaker to delay the signal of a sound reproduction system. CONSTITUTION:The output voltage of a pickup 2 of a record player to which the speed amplitude of a stylus tip is applied is supplied to an amplifier 4 via a delay circuit 10. The output voltage given from the amplifier 4 is applied to a speaker 6 and converted into sound waves to be radiated. The circuit 10 delays the input of the pickup 2 and the sound pressure and the phase radiated from the speaker 6 over all frequencies and at the same time. Such a delay circuit is provided a speaker signal system to set the delay time properly. Thus it is possible to prevent the howling in any user's listening room. |
