| 摘要 |
A circuit for reproducing a signal from a moving record carrier includes a circuit input supplied with a signal read out from the moving record carrier, for example, a record disc having a spiral track in which the signal is recorded, and in which the signal has variations in its level due to the shift of reading out position on the carrier. The signal from the input is supplied to an automatic gain control loop including a gain control circuit and a gain control signal generating circuit connected to the output of the gain control circuit for producing a gain control signal varying in response to the level of the read out signal. The gain control signal is supplied to the gain control circuit for controlling the gain thereof and is also supplied to a variable gain amplifier, for example, an equalizing amplifier, which also receives the output signal from the gain control circuit and has a variable gain-frequency characteristic which is controlled in response to the gain control signal and which varies in correspondence with the frequency of the signal applied thereto to be amplified. |
