Discrete 4-channel stereo recording and/or reproducing system compatible with matrix systems
Stereo loudspeaker system for a picture reproducing screen
Directional enhancement circuit
Automated stereo synthesizer for audiovisual programs
Multi-channel stereo reproducing apparatus
Sound reproduction Patent #: 4862502
ApplicationNo. 412751 filed on 09/26/1989
US Classes:381/307, Surround (i.e., front plus rear or side)381/22, Variable decoder381/27Center channel
ExaminersPrimary: Isen, Forester W.
Attorney, Agent or Firm
International ClassH04R 005/02
Foreign Application Priority Data1989-01-24 JP
AbstractThe invention provides surround mode stereophonic reproducing equipment for using the Dolby surround mode and another surround mode other than the Dolby mode by means of selectively switching between them. The equipment is provided with two front power amplifiers for driving front speakers on the right and left, and two rear power amplifiers for driving the rear speakers. The rear speakers are driven jointly by one of the rear power amplifiers while the center speaker is driven by the other power amplifier when using the Dolby surround mode, and the rear speakers are respectively driven by the two rear power amplifiers when using a surround mode other than the Dolby surround mode.