| 摘要 |
The circuit uses measurement of output energy to ensure that filtered signal has acceptable signal amplitude. The signal processing unit comprises a first gain control block (20) serving to control the gain of the input signal (50), and a signal processing block such as a passband filter (10) receiving the output from the gain control block. A further block (30) is connected to the output of the processing block in order to detect the energy contained within the processed output signal. This is used to control the gain of the first block as a function of the output energy level. The first block (20) compresses the amplitude of the input signal to attain a level corresponding to the dynamic range of the signal processing block.
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