| 摘要 |
<p>A detector for deriving stereophonic audio difference (L-R) signal from a stereophonic composite signal and matrix amplifier means coupled to the detector for combining the difference signals with audio sum (L+R) signals to produce left (L) and right (R) audio signals. Automatic switching means for transferring the system between monophonic and stereophonic reproduction modes is also provided. The system is adapted for fabrication in integrated circuit form.</p> |
