Signal strength information dependence control null dynamic transducer of the small-sized dynamic transducer in

摘要

For dynamic transducer (4) to the level of the audio signal, being the control circuit for signal strength information dependence frequency response adaptation of the audio signal, following the signal strength information decisive expedient which seeks signal strength information (2 and 6) with, dynamic transducer (4) concerning the audio signal of high level the audio signal it is warped low and converts to the sound signaling, in order flat to become frequency response low concerning the audio signal of level, responding to signal strength information, the adjustment expedient which selectively does frequency adjustment (3) it has the audio signal. By this constitution, the audio signal low the frequency limits gain of the high frequency limits of the audio signal are adjusted with the gain which differs, low when level of the audio signal rises, shift the frequency which separates from the frequency limits and the high frequency limits, in high value, when level of the audio signal decreases, shift in low value. This invention furthermore, this way proposes the portable communications terminal which has the control circuit which is designed.