DRIVE DEVICE

PROBLEM TO BE SOLVED: To reduce influences caused by distortion in a detection signal obtained by detecting a current flowing in a loudspeaker, in a configuration in which the loudspeaker is BTL-connected with an amplifier.SOLUTION: In a drive device 10, a loudspeaker unit 4 is BTL-connected with an...

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1. Verfasser: OKAMI TAKESHI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To reduce influences caused by distortion in a detection signal obtained by detecting a current flowing in a loudspeaker, in a configuration in which the loudspeaker is BTL-connected with an amplifier.SOLUTION: In a drive device 10, a loudspeaker unit 4 is BTL-connected with an output circuit 32 of the amplifier, and two current detection resistors 35a and 35b are provided between the output circuit 32 and the loudspeaker unit 4. The current detection circuit 14, detects a drive current flowing in the loudspeaker unit 4 on the basis of currents flowing in the two current detection resistors 35a and 35b, and outputs a current detection signal. The drive control unit 15 preliminarily stores an error included in the current detection signal outputted from the current detection circuit 14, and when controlling a drive state of the loudspeaker, corrects the current detection signal outputted from the current detection circuit 14 on the basis of the preliminarily stored error.SELECTED DRAWING: Figure 4 【課題】増幅器にスピーカーをBTL接続する構成において、スピーカーに流れる電流を検出した検出信号の歪みによる影響を低減できるようにする。【解決手段】駆動装置10は、増幅器の出力回路32にスピーカーユニット4がBTL接続され、出力回路32とスピーカーユニット4との間に2つの電流検出抵抗35a,35bを備える。電流検出回路14は、2つの電流検出抵抗35a,35bに流れる電流に基づいてスピーカーユニット4に流れる駆動電流を検出して電流検出信号を出力する。駆動制御部15は、電流検出回路14から出力される電流検出信号に含まれる誤差を予め記憶しておき、スピーカーの駆動状態を制御するときには、電流検出回路14から出力される電流検出信号を予め記憶している誤差に基づいて補正する。【選択図】図4