Electrical audio signal processing systems and devices – One-way audio signal program distribution
Patent
1996-10-23
1998-10-06
Tran, Sinh
Electrical audio signal processing systems and devices
One-way audio signal program distribution
381 2, H04B 300
Patent
active
058189483
ABSTRACT:
There 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.
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Universal Serial Bus Specification, Compaq et al., Revision 0.9, Mar. 31, 1995, pp. 1-120.
Advanced Micro Devices , Inc.
Kivlin B. Noel
Tran Sinh
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