Patent ID: 7936842
Filing Date: 2011-05-03
Classification: H03F,H03G,H04B,H04L

Abstract:
1. A bit-rate automatic control circuit for feedback controlling gain and bandwidth of a preamplifier in dependence on a bit-rate of a signal, comprising: a bit-rate discrimination circuit configured to discriminate the bit rate of the signal; an alarm circuit configured to determine whether a value of received power of the signal is less than a minimum acceptable value of the preamplifier or not, wherein if said alarm circuit determines that the value of received power of the signal is less than the minimum acceptable value of the preamplifier, the bit-rate automatic control circuit determines, irrespective of the discrimination of said bit-rate discrimination circuit, that the bit-rate of the signal is low, and if said alarm circuit determines that the value of received power of the signal is equal to or more than the minimum acceptable value of the preamplifier, the bit-rate automatic control circuit determines the bit-rate of the signal in accordance with the discrimination made by said bit-rate discrimination circuit.