The patent's inventor is Yang, Liuqing (
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "With the transition from analog to digital TV broadcasting comes the availability of bandwidth for new generations of wireless devices. After the transition, many channels become available, especially the upper ranges of the TV bands such as channels 14-83, also known as ultrahigh frequency or UHF. These available channels are vacant frequencies. The
"WSDs are expected to operate in a cognitive manner by sensing and detecting over-the-air digital TV (DTV) signals and avoiding these occupied frequency bands. However, cable TV (CATV) also shares part of this 'white space' spectrum. Hence WSDs avoiding over-the-air DTV band may still cause interference to television receivers connected to CATV service. Such interference was confirmed in tests and reported by the
"Among these tested prototype devices, none has reported the ability to identify CATV usage information. The current white space identification is performed based on spectrum sensing, which is not effective for CATV.
"However, the interference from these devices to CATV have been tested and proved to be non-negligible. In addition, both reports indicate that the interference effect is significant even for low power devices.
"From the reported signal detection performance for over-the-air DTV signals, it can be inferred that it is essentially impossible for the prototype devices to sense and avoid CATV active channel since the signal leakage from the CATV (if any) is significantly weaker than over-the-air DTV signals, while the number of CATV channels is large.
"As a result, obtaining knowledge on the active channel usage of CATV is critical for the identification of usable TV-band white space which complies with the
"Accordingly, there is a need in the art for a white space identifier directed for use with active cable TV channels."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "Embodiments of the present invention relate to identification of usable TV-band white space spectrum for white space device applications.
"According to an embodiment of the present invention, a white space identifier is provided that can decode a received channel-changing-command of an infrared-emitting remote control of a TV set to determine the active channel number of a user's cable TV. The decoded active channel number can then be broadcast via a wireless transmitter to all white space devices (WSDs) in the interference range. The infrared receiver parameters of the subject identifier can be set according to the model and make of the TV set at an initialization step.
"In one embodiment, the wireless transmitter of implementations of the subject identifier only needs to send the number of the active cable TV channel. In total, there are 166 channels for the CATV broadcasting in
"The subject identifier can be implemented using a stand-alone device having an infrared sensor and wireless controller. In another embodiment, the subject identifier can be incorporated as a component of a TV set, or a smaller stand-alone device (such as a set-top box, VCR/DVR, etc.) connected to the TV set via wired or wireless means. In yet another embodiment, the wireless transmitter can be integrated in the TV remote control or a global remote control. In such an embodiment, the channel changing operation of the remote control can directly trigger the wireless transmitter. In a further embodiment, multiple TV sets can be accommodated."
For the URL and additional information on this patent, see: Yang, Liuqing. Smart TV-Band White Space Identifier. U.S. Patent Number 8627401, filed
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