| 摘要 |
The automatic gain control apparatus comprises rectifier means (1) for converting the level of a received signal into a DC voltage; comparing means (2) for converting said DC voltage into a first control signal (output 2); voltage generating means (3) responsive to said first control signal (output 2) and a second control signal (output 7) for generating an automatic gain control voltage (output 3); AGC circuit means (4) responsive to said automatic gain control voltage for controlling the amplitude of said received signal; detector means (8) for envelope-detecting the output of said AGC circuit means (4); analog/digital converter means (5) for converting the output of said detector means (8) into a digital signal; digital AGC controller means (6) for digitally processing the output signal of said analog/digital converter means (5); and digital/analog converter means (7) for converting the output signal of said AGC controller means (6) into an analog signal and supplying said second control signal (output 7). |
