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文中针对移动数字多媒体广播多时隙的特点,提出了一种全新的自动增益控制(AGC)方法。根据采样得到的多媒体广播的当前信号平均功率,将增益控制信号反馈给自动增益控制电路,即重新设置Tuner的增益。如果当前信号平均功率大于设定的接收信号功率范围,则减小Tuner的增益,否则增大Tuner的增益,最终将接收到的信号平均功率调整到设定的范围内,以便接收终端能够流畅的接收播放移动多媒体广播的音视频信号、紧急广播信息以及播发的其它信息。
Aimed at the characteristics of multiple slots in mobile digital multimedia broadcasting, a new automatic gain control (AGC) method is proposed. According to the sampled average current signal power of the multimedia broadcasting, the gain control signal is fed back to the automatic gain control circuit, that is, the Tuner gain is reset. If the average power of the current signal is greater than the set power range of the received signal, the Tuner gain is reduced, otherwise, the Tuner gain is increased, and finally the average received signal power is adjusted to the set range so that the receiving terminal can be smooth Receive broadcast audio and video signals of mobile multimedia broadcast, emergency broadcast information and other information broadcast.