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    • 3. 发明授权
    • Signal detector with coefficient swapping transform unit
    • 具有系数交换变换单元的信号检测器
    • US06771767B1
    • 2004-08-03
    • US09225276
    • 1999-01-05
    • Jin LiYan Zhou
    • Jin LiYan Zhou
    • H04M100
    • H04L27/30H04M1/50
    • A signal detector includes a transform unit and a post processing test unit. The transform unit is adapted to a transform unit adapted to receive at least first and second frames of input samples, determine a first plurality of energy values for the first frame based on a first set of transform coefficients, and determine a second plurality of energy values for the second frame based on a second set of transform coefficients. The post processing test unit is adapted to identify at least one target frequency based on the first plurality of energy values. The second set of transform coefficients is based on the target frequency, and the post processing unit is adapted to determine the presence of a first signal in the input samples based on the second plurality of energy values. A method for detecting a signal is provided. A first frame of input samples is received. A first set of transform coefficients is determined based on a first plurality of frequencies. A first plurality of energy values is determined based on the first set of transform coefficients. A target frequency is determined from the first plurality of frequencies based on the first plurality of energy values. A second set of transform coefficients is determined based on the target frequency. A second frame of input samples is received. A second plurality of energy values is determined based on the second set of transform coefficients. The presence of the signal in the input samples is determined based on the second plurality of energy values.
    • 信号检测器包括变换单元和后处理测试单元。 变换单元适用于适于接收输入样本的至少第一和第二帧的变换单元,基于第一组变换系数确定第一帧的第一多个能量值,并且确定第二多个能量值 用于基于第二组变换系数的第二帧。 后处理测试单元适于基于第一多个能量值来识别至少一个目标频率。 第二组变换系数基于目标频率,并且后处理单元适于基于第二多个能量值来确定输入样本中的第一信号的存在。 提供一种用于检测信号的方法。 接收第一帧输入样本。 基于第一多个频率来确定第一组变换系数。 基于第一组变换系数确定第一多个能量值。 基于第一多个能量值,从第一多个频率确定目标频率。 基于目标频率确定第二组变换系数。 接收第二帧输入样本。 基于第二组变换系数确定第二多个能量值。 基于第二多个能量值来确定输入样本中的信号的存在。
    • 4. 发明授权
    • Signal detector with automatic gain control
    • 信号检测器具有自动增益控制
    • US06580792B1
    • 2003-06-17
    • US09225978
    • 1999-01-05
    • Jin LiYan Zhou
    • Jin LiYan Zhou
    • H04M100
    • H04Q1/4575
    • A signal detector includes a transform unit, a gain control unit, and an energy level threshold unit. The transform unit is adapted to receive a plurality of input samples and calculate a first plurality of delay values based on the input samples. Each delay value is based on at least one previous delay value and a current input sample. The transform unit is adapted to calculate a first energy value based on at least a subset of the first plurality of delay values. The gain control unit is adapted to determine if a selected delay value of the first plurality of delay values exceeds a predetermined threshold and scale the selected delay value, the at least one previous delay value used to calculate the selected delay value, and subsequent input samples received after the current input sample by a first amount in response to the selected delay value exceeding the predetermined threshold. The energy level threshold unit is adapted to determine the presence of a first signal in the input samples based on the first energy level.
    • 信号检测器包括变换单元,增益控制单元和能级阈值单元。 变换单元适于接收多个输入样本,并且基于输入样本计算第一多个延迟值。 每个延迟值基于至少一个先前的延迟值和当前输入样本。 变换单元适于基于第一多个延迟值的至少一个子集来计算第一能量值。 所述增益控制单元适于确定所述第一多个延迟值的所选择的延迟值是否超过预定阈值,并且缩放所选择的延迟值,所述至少一个先前延迟值用于计算所选择的延迟值,以及随后的输入采样 响应于所选择的延迟值超过预定阈值,在当前输入样本之后接收到第一量。 能级阈值单元适于基于第一能级来确定输入样本中的第一信号的存在。
    • 5. 发明授权
    • Signal detector with duration-based frame width
    • 信号检测器,基于持续时间的帧宽度
    • US06763106B1
    • 2004-07-13
    • US09196267
    • 1998-11-19
    • Jin LiYan ZhouVijayakumaran Velayudhan Nair
    • Jin LiYan ZhouVijayakumaran Velayudhan Nair
    • H04M100
    • H04M1/50
    • A signal detector for detecting at least a first signal having a first frequency and a first minimum duration is provided. The signal detector includes a matched transform unit and an energy level detection unit. The matched transform unit is adapted to receive at least a first frame of time domain input samples at a sampling frequency and generate at least a first frequency energy value for the first frame based on at least a first subset of the time domain input samples. The first subset of the first frame has a width of less than about one half of the first minimum duration. The energy level threshold unit is adapted to compare the first frequency energy value to a threshold energy value to determine the presence of the first signal. A method for detecting at least a first signal having a first frequency and a first minimum duration is provided. The method includes receiving at least a first frame of time domain input samples at a sampling frequency. At least a first frequency energy value is generated for the first frame based on at least a first subset of the time domain input samples. The first subset of the first frame has a width of less than about one half of the first minimum duration. The first frequency energy value is compared to a threshold energy value to determine the presence of the first signal.
    • 提供一种用于检测至少具有第一频率和第一最小持续时间的第一信号的信号检测器。 信号检测器包括匹配变换单元和能级检测单元。 匹配变换单元适于以采样频率接收时域输入采样的至少第一帧,并且基于时域输入采样的至少第一子集生成用于第一帧的至少第一频率能量值。 第一帧的第一子集具有小于第一最小持续时间的大约一半的宽度。 能级阈值单元适于将第一频率能量值与阈值能量值进行比较,以确定第一信号的存在。 提供一种用于检测至少具有第一频率和第一最小持续时间的第一信号的方法。 该方法包括以采样频率接收时域输入采样的至少第一帧。 基于时域输入样本的至少第一子集,为第一帧生成至少第一频率能量值。 第一帧的第一子集具有小于第一最小持续时间的大约一半的宽度。 将第一频率能量值与阈值能量值进行比较,以确定第一信号的存在。
    • 6. 发明授权
    • Signal detector with matched filter coefficient
    • 具有匹配滤波器系数的信号检测器
    • US06556674B1
    • 2003-04-29
    • US09196258
    • 1998-11-19
    • Jin LiVijayakumaran Velayudhan NairYan Zhou
    • Jin LiVijayakumaran Velayudhan NairYan Zhou
    • H04M300
    • H04Q1/45
    • A signal detector for detecting at least a first signal having a first frequency includes a matched transform unit and an energy level threshold unit. The matched transform unit is adapted to receive at least a first frame of time domain input samples at a sampling frequency and generate at least a first frequency energy value for the first frame based on at least a first subset of the time domain input samples and a first matched filter coefficient. The sampling frequency is a non-integral multiple of the first frequency, and the first matched filter coefficient depends on the first frequency. The energy level threshold unit is adapted to compare the first frequency energy value to a threshold energy value to determine the presence of the first signal. A method for detecting at least a first signal having a first frequency is provided. The method includes receiving at least a first frame of time domain input samples at a sampling frequency. At least a first frequency energy value for the first frame is generated based on at least a first subset of the time domain input samples and a first matched filter coefficient. The sampling frequency is a non-integral multiple of the first frequency, and the first matched filter coefficient depends on the first frequency. The first frequency energy value is compared to a threshold energy value to determine the presence of the first signal.
    • 用于检测具有第一频率的至少第一信号的信号检测器包括匹配变换单元和能级阈值单元。 匹配变换单元适于以采样频率接收时域输入样本的至少第一帧,并且基于时域输入采样的至少第一子集和第一帧生成至少第一频率能量值 第一匹配滤波器系数。 采样频率是第一频率的非积分倍数,第一匹配滤波器系数取决于第一频率。 能级阈值单元适于将第一频率能量值与阈值能量值进行比较,以确定第一信号的存在。 提供一种用于检测至少具有第一频率的第一信号的方法。 该方法包括以采样频率接收时域输入采样的至少第一帧。 至少基于时域输入样本的第一子集和第一匹配滤波器系数来生成第一帧的第一频率能量值。 采样频率是第一频率的非积分倍数,第一匹配滤波器系数取决于第一频率。 将第一频率能量值与阈值能量值进行比较,以确定第一信号的存在。