Architecture for a universal serial bus-based PC speaker controller
October 23, 2016. 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 3860921 Muting circuit Muting apparatus in car audio system Multiplexed digital audio and control/status serial protocol Managing audio data using a graphics display controller Automatic dynamic VOX circuit Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles System having independently addressable bus interfaces coupled to serially connected multi-ported signal distributors generating and maintaining frame based polling schedule favoring isochronous peripherals Computer system having a power conservation mode and utilizing a bus arbiter device which is operable to control the power conservation mode System and method for power control in a universal serial bus InventorAssigneeApplicationNo. 731956 filed on 10/23/1996US Classes:381/77, ONE-WAY AUDIO SIGNAL PROGRAM DISTRIBUTION381/2Broadcast or multiplex stereoExaminersPrimary: Tran, SinhAttorney, Agent or FirmForeign Patent References
International ClassH04B 003/00AbstractThere is provided a novel powered loudspeaker implemented to be compatible with the USB specification. The powered speaker includes a speaker driven by a power amplifier coupled to a power supply. Both the amplifier and the power supply, in turn, are coupled to a USB controller. The controller is configured to provide USB functionality and compatibility. In addition, provides a phase locked loop (PLL) for recovering a timer clock from the received data stream. The present invention further includes a function whereby the absence of data on the relevant channel is detected and the output to the speakers is muted in response thereto. A further circuit is provided that controls when the output to the speaker is turned on such that no clicks or pops occur at power-up or when the device or bus is not stable. In addition, tone control, including base and treble filters, volume control, and balance between left and right outputs (in a stereo version) are provided. Furthermore, power management functionality is provided. If the USB has been idle for a predetermined period of time, the system can place itself into a low power sleep mode, or the loud speaker can be placed into a sleep mode via software from the host.Other References
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