| 摘要 |
PURPOSE:To correct multi-path distortion in terms of audible sense by changing the separation of a stereo signal in proportion to the level of the multi-path distortion depending on the quantity of phase shift of the pilot signal included in an envelope of an intermediate frequency. CONSTITUTION:A detector 3 detects a composite signal by suing an IF signal from an IF amplifier circuit 2 and the signal is inputted to an LPF4, a BPF15 and a subcarrier generating circuit 6. Further, the IF signal from the amplifier circuit 2 is amplified (10), subjected to envelope detection at an AM detector 11 and the detected output is inputted to a pilot signal extracting circuit 12. The detected output from the circuit 12 is fed to a multiplier 13 to apply synchronous detection to the pilot signal giving a phase reference and the result is fed to a VCA7 via a DC converting circuit 9 as a control signal. Outputs of the BPF5 and the circuit 6 are multiplied (18) to form sub signals L-R at the VCA7, the output is inputted to a matrix circuit 8, a main signal L+R being an output of the LPF4 is inputted to the circuit 8, from which stereo signals L, R are outputted. |
