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    • 6. 发明授权
    • Method and system for detecting digital QAM, VSB and analog TV signals
    • 用于检测数字QAM,VSB和模拟电视信号的方法和系统
    • US07265793B2
    • 2007-09-04
    • US10864120
    • 2004-06-09
    • Jorge J. WongDonald G. McMullinFrederick G. WallsThomas L. Spieker
    • Jorge J. WongDonald G. McMullinFrederick G. WallsThomas L. Spieker
    • H04N7/084
    • H04N5/4401H04N5/46H04N7/106H04N21/42638H04N21/4382
    • A method and system is provided, which may detect digital QAM, VSB and analog TV signals in a faster and more efficient manner than conventional systems. The system and method may be deployed in, for example, cable TV set-top boxes, cable TV modems and television set receivers, which may be coupled to a cable TV or off-the-air terrestrial network. Power measurements of the RF carriers found in a cable TV channel may be utilized to determine whether a digital QAM signal, digital VSB signal, or an analog signal is present in a TV channel. In this regard, it is not necessary for a receiver to demodulate, lock, synchronize, decode and/or validate any video or audio information or digital bit stream in order to detect digital QAM, digital VSB and analog TV signals, or not signal at all. Accordingly, the process of detecting digital QAM, digital VSB and analog TV signals is shortened and simplified.
    • 提供了一种方法和系统,可以以比传统系统更快更有效的方式检测数字QAM,VSB和模拟电视信号。 该系统和方法可以部署在例如可以耦合到有线电视或空中地面网络的有线电视机顶盒,有线电视调制解调器和电视机接收机中。 可以利用在有线TV信道中发现的RF载波的功率测量来确定数字QAM信号,数字VSB信号或模拟信号是否存在于TV信道中。 在这方面,接收机不需要解调,锁定,同步,解码和/或验证任何视频或音频信息或数字比特流,以便检测数字QAM,数字VSB和模拟TV信号,或者不在 所有。 因此,对数字QAM,数字VSB和模拟电视信号进行检测的过程被简化和简化。