Surround mode stereophonic reproducing equipment
Patent 4953213 Issued on August 28, 1990. Estimated Expiration Date: 
September 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3697692 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 InventorsApplicationNo. 412751 filed on 09/26/1989US Classes:381/307, Surround (i.e., front plus rear or side)381/22, Variable decoder381/27Center channelExaminersPrimary: Isen, Forester W.Attorney, Agent or FirmInternational ClassH04R 005/02Foreign Application Priority Data1989-01-24 JPAbstractThe 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.Other References
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