| 摘要 |
PURPOSE: To prevent the overexcitation of a loudspeaker and to hold the balance of signal energy by correcting power as a function of correction level in response to an information signal. CONSTITUTION: When the loudspeaker is arranged against a wall or at a corner, the wall and the corner are make to function as a sound echo body and a radiation dispersion pattern is adjusted as a set pattern corresponding to the position of the speaker. An automatic balance circuit 260 uses a gain control circuit 270 and an automatic bias circuit 282 uses an automatic bias switch of a circuit 276 to detect the power level of the loudspeaker and turn a signal route to a conductive state when the power level is more than a set minimum level. A power monitor circuit 280 prevents the excess excitation of the loudspeaker and an automatic balance circuit 258 balances a signal energy level between two acoustic channels. |
