| 摘要 |
PURPOSE:To prevent a bit error due to malfunction of a peak detection type f<1/2> AGC circuit while equalizing a transmission line automatically by setting the state of the peak detection type f<1/2> AGC circuit equalizing the transmission line at no data transmission and keeping the state set at the no data transmission in the case of the data transmission. CONSTITUTION:The transmission line 4 is equalized by the peak value detection f<1/2> AGC circuit 1 and a data is sent to a digital circuit 3 in which data transmission and various data controls are applied. Since it is considered at first that the digital transmission is in the no data transmission state, a control circuit 2 receives information from the digital circuit 3 to control the peak value detection f<1/2> AGC circuit 1, thereby applying equalization suitable for the transmission line 4. That is, the transmission line 4 is equalized automatically without using a test device nor manual intervention. Then in detecting the digital circuit 3 to be in the data transmission state, the control circuit 2 receives the information to control the peak value detection f<1/2> AGC circuit 1, thereby keeping the state at no data transmission during the data transmission.
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