| 摘要 |
PURPOSE:To improve the S/N by mixing audio signals L, R in the ratio corresponding to an antenna input level to change continuously the separation. CONSTITUTION:The emitter of transistors (TRs) Q11, Q14 is grounded and the audio signals L, R are applied respectively to the base. The collector of the TRO11, Q14 is connected respectively to the emitter of TRQ12, Q13 and Q15, Q16 and each base of the TRQ12, Q16 and Q13, Q15 is connected together respectively and each collector of TRQ12, Q15 and Q13, Q16 is connected together respectively. Further, the base potential of the TRQ12, Q15 and Q13, Q15 is connected differetially in response to the antenna input level, the signals L, R are extracted while being mixed in the ratio corresponding to the antenna input level from the collector of the TRQ12, Q15 and Q13, Q16 and the S/N is improved by changing continuously the separation. Since no externally mounted component is required, the receiver is suited to circuit integration and the nonlinear distortion is reduced because of current operation and the distortion is decreased even with a low power supply voltage Vcc. |
