| 摘要 |
PURPOSE:To reduce the distortion, by connecting the output of an amplifier to a speaker via an impedance circuit, by grounding the speaker with a negative register circuit equal to a voice coil, and by making the positive feed back on the output of the amplifier to the register circuit of a phase circuit in order to make phases of input voltage and sound pressure waveform to be the same. CONSTITUTION:The output side of a voice amplifier 1 is connected with the positive terminal of a electrodynamic speaker 3 via an impedance circuit 2. The negative terminal of the speaker 3 is connected with a negative register circuit 4, whose value is equal to the value of DC register of the voice coil of the speaker 3, with a specified frequency characteristics. The circuit 4 grounds the negative terminal side of the speaker 3, and the output of the amplifier 1 is processed by the positive feed back to the circuit 4 via a phase circuit 5. As a result, the minimum resonance frequency is lowered without increasing the Q of the resonance of the minimum resonance frequency to widen the regeneration range for low frequency and the phases of input voltage and sound pressure waveform are made to be the same at the minimum resonance frequency and at adjacent range so that the distortion is reduced. |
