| 摘要 |
The invention is suitable for the field of multimedia sound processing and provides a volume control circuit and device as well as multimedia equipment. The volume control circuit comprises an audio signal preamplification circuit, a positive peak voltage acquisition circuit, a coefficient factor generation circuit and an audio signal amplitude change circuit. In the invention, an audio signal input to the volume control circuit from a signal source is preamplified, and the audio signal is regulated according to the reference voltage and the positive peak voltage corresponding to the preamplified audio signal, therefore, the audio signal is stabilized to the appointed strength. |
