Decoding Circuit of Multiplex Signal in Stereo Radio Receiver (Schal tungsanordnung zur Decodierung eines Multiplexsignals in einem Stereo-Rundfunkempfanger)

摘要

The present invention provides a stereo radio for decoding a multiplex signal including a sum signal L + R in a baseband, a subcarrier modulated by the difference signal LR, and a pilot signal having a half frequency of the subcarrier. A decoding circuit for a multiplex signal in a receiver, wherein the multiplex signal in digital form is multiplied by a reference carrier having two phase states mutually displaced by 90 ° resulting from a scanning clock generated in a radio receiver. Each of the mixed signals generated by the multiplication is multiplied by one correction signal to form a corrected mixed signal. The corrected mixed signal is added and supplied to the matrix circuit together with the synthesized signal to form stereo-audio signals L and R.