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    • 78. 发明授权
    • Methods and apparatus for efficient tone detection
    • 用于高效音调检测的方法和装置
    • US09058209B2
    • 2015-06-16
    • US13442169
    • 2012-04-09
    • Gil Naveh
    • Gil Naveh
    • G06F17/10G06F7/50G06F7/52
    • G06F7/50G06F7/52G06F17/10H04M7/129H04M7/1295H04Q1/4575
    • An apparatus for determining the presence of a tone in an input signal includes memory circuitry and data processing circuitry coupled to the memory circuitry. The data processing circuitry is operative to receive multiple samples of the input signal, and to determine a first value at least in part by multiplying each of the samples by respective ones of a first set of values for an impulse response and summing the results. The data processing system is also operative to determine a second value at least in part by multiplying each of a portion of the samples by respective ones of a second set of values for the impulse response and summing the results. The data processing system is operative to determine the power of the tone in the multiple samples of the input signal at least in part by utilizing the first value and the second value.
    • 用于确定输入信号中存在音调的装置包括耦合到存储器电路的存储器电路和数据处理电路。 数据处理电路可操作以接收输入信号的多个样本,并且至少部分地通过将每个样本乘以用于脉冲响应的第一组值的相应值并将结果相加来确定第一值。 所述数据处理系统还可操作以至少部分地通过将所述样本的每一个乘以脉冲响应的第二组值并将结果相加来确定第二值。 数据处理系统至少部分地通过利用第一值和第二值来确定输入信号的多个样本中的音调的功率。