1. Technical Field
The disclosed embodiments relate in general to a control method of sound producing, a sound producing apparatus for a portable device, and a portable apparatus.
2. Description of the Related Art
A speaker reproducing audible sound is typically limited to its maximum excursion, temperature rising, transducer's non-linearity and its corresponding amplifier induced nonlinearity. In general, a speaker is driven under a rated power for a long period, and under a maximum power in a short period, which are determined by the manufacturer. The driven power restrictions confine the maximum excursion as well as temperature rising of a speaker in a safe range. For a reproduced signal of a large dynamic range without any distortion, the loudness of the speaker is small, especially for a handheld device under the power restrictions. Consequently, a dynamic range compression (DRC) technology has been introduced in a speaker system for decades so as to trade-off the distortion and loudness under the power restrictions.