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    • 1. 发明授权
    • Systems, methods, and apparatuses for detecting digital television (DTV) communications signals
    • 用于检测数字电视(DTV)通信信号的系统,方法和装置
    • US08599970B2
    • 2013-12-03
    • US12945196
    • 2010-11-12
    • Andrew Joo KimSeungmok OhMatthew KuhnBob NayarYoungsik Hur
    • Andrew Joo KimSeungmok OhMatthew KuhnBob NayarYoungsik Hur
    • H04L27/06H04N5/44
    • H04N17/004
    • A received RF signal is down-converted to a baseband or low-IF digitized signal in order to search for a pilot signal that indicates a presence of a DTV signal such as an ATSC DTV signal. The pilot signal characteristically resides in a fixed frequency range for all valid DTV signals and is extracted by processing the baseband or low-IF signal in multiple stages. The first stage reduces signal information to that pertaining to the frequency band covering all valid pilot frequencies, thereby reducing the sampling rate and computational complexity of subsequent operations. A second stage operates on this reduced rate signal to focus on a series of particular pilot frequencies for interrogation. For each such candidate frequency, the cyclostationarity of the signal is measured and tested for statistical significance relative to the background energy to yield an effective test that is invariant with respect to background noise level.
    • 接收的RF信号被下变频为基带或低IF数字信号,以便搜索指示诸如ATSC DTV信号的DTV信号的存在的导频信号。 导频信号特征性地驻留在所有有效DTV信号的固定频率范围内,并且通过多级处理基带或低IF信号来提取。 第一级将信号信息减少到与覆盖所有有效导频的频带有关的信号,从而降低后续操作的采样率和计算复杂度。 第二阶段对该降低的速率信号进行操作,以集中于一系列特定的用于询问的导频。 对于每个这样的候选频率,测量和测试信号的相对于背景能量的统计学显着性的信号的周期平稳度,以产生相对于背景噪声水平不变的有效测试。
    • 3. 发明申请
    • SYSTEMS, METHODS, AND APPARATUSES FOR DETECTING DIGITAL TELEVISION (DTV) COMMUNICATIONS SIGNALS
    • 用于检测数字电视(DTV)通信信号的系统,方法和装置
    • US20110169965A1
    • 2011-07-14
    • US12945196
    • 2010-11-12
    • Andrew Joo KimSeungmok OhMatthew KuhnBob NayarYoungsik Hur
    • Andrew Joo KimSeungmok OhMatthew KuhnBob NayarYoungsik Hur
    • H04N17/00
    • H04N17/004
    • Embodiments of the invention may provide systems and methods for detecting the presence a DTV signal such as an ATSC DTV signal. The system and methods may be applied to a received RF signal that has been down-converted to a baseband or low-IF digitized signal. The systems and methods may detect a presence of a DTV signal by searching for its characteristic pilot signal, known to reside in a fixed frequency range for all valid DTV signals. This pilot signal may be extracted by processing the baseband or low-IF signal in multiple stages. The first stage may reduce the signal information to that pertaining to the frequency band covering all valid pilot frequencies and commensurately reduces the sampling rate, and hence computational complexity of subsequent operations. A second stage may then efficiently operate on this reduced rate signal to focus on a series of particular pilot frequencies for interrogation. For each such candidate frequency, the cyclostationarity of the signal may be measured and tested for statistical significance relative to the background energy to yield an effective test that is invariant with respect to the background noise level. In a simplified case, this can correspond to measuring the energy in a very tight candidate subband normalized against the energy from a larger subband. Furthermore, the energy in the candidate subband can be taken as the energy in a Fourier series coefficient.
    • 本发明的实施例可以提供用于检测诸如ATSC DTV信号之类的DTV信号的存在的系统和方法。 系统和方法可以应用于已经被下变频到基带或低IF数字化信号的接收的RF信号。 系统和方法可以通过搜索其特征导频信号来检测DTV信号的存在,已知其驻留在所有有效DTV信号的固定频率范围内。 可以通过多级处理基带或低IF信号来提取该导频信号。 第一级可以将信号信息减少到覆盖所有有效导频的频带,并相应地降低采样速率,从而降低后续操作的计算复杂度。 然后,第二级可以有效地对该降低的速率信号进行操作,以集中在一系列特定的导频上进行询问。 对于每个这样的候选频率,信号的周期平稳性可以相对于背景能量被测量和测试统计学显着性,以产生相对于背景噪声电平不变的有效测试。 在简化的情况下,这可以对应于在相对于较大子带的能量标准化的非常紧密的候选子带中测量能量。 此外,可以将候选子带中的能量作为傅里叶级数系数​​的能量。