| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive circuit which improves frequency characteristics of a speaker by a return signal and can constantly and easily realize.SOLUTION: A drive circuit includes: a combiner which combines a first return signal and a second return signal with an input signal; a mixer which includes an inverter circuit which inverts the signal combined by the combiner to a reverse phase; an amplifier which amplifies an output signal from the mixer; a voltage detection section which detects load on a speaker to which the signal amplified by the amplifier is input, and voltage of the speaker load; an L component correction section which band-passes the signal detected by the voltage detection section and outputs the signal as the first return signal; a current detection section which is connected in series to the speaker load and detects elements following Ohm's law and currents flowing to the elements; and the inverter circuit which inverts the signal detected by the current detection section into a reverse phase and output the signal as the second return signal.SELECTED DRAWING: Figure 1 |
