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热词
    • 3. 发明授权
    • Demodulating circuit, demodulating apparatus, demodulating method, and
modulating/demodulating system of acoustic signals
    • 解调电路,解调装置,解调方法以及声信号的调制/解调系统
    • US5815035A
    • 1998-09-29
    • US816376
    • 1997-03-13
    • Shinichi YamagishiNoritaka Egami
    • Shinichi YamagishiNoritaka Egami
    • H03D1/00E21B47/16H03D1/02H03H9/22H04L27/06H04L27/22H04L27/233G01V3/00
    • H03D1/02E21B47/16H04L27/2335
    • A demodulating method wherein the signal can be demodulated accurately even if the S/N ratio is lower by calculating an amplitude peak value by a specific formula from two values of an amplitude of an acoustic signal corresponding to a phase difference of 90 degrees at a carrier frequency transmitted by an acoustic signal transmitter, setting a threshold level preliminarily for the amplitude peak value, and demodulating the amplitude peak value by binarization on the basis of the threshold level, and a demodulating circuit and a demodulating apparatus used in the execution thereof. It is further possible to follow up automatically even when the acoustic characteristics change by automatically calculating the average of peak values of output of the vibration sensor in a state not transmitting the acoustic signal, automatically setting the signal level by a formula predetermined on the basis of the obtained average, and automatically calculating the threshold level from the average of the peak values and the signal level.
    • 一种解调方法,其中即使S / N比较低,也可以通过在载波上计算对应于90度的相位差的声信号的振幅的特定公式的幅度峰值来精确地解调该信号 通过声信号发送器发送的频率,对于振幅峰值预先设定阈值电平,并且基于阈值电平对二值化解调振幅峰值,以及在其执行中使用的解调电路和解调装置。 即使当声学特性通过在不发送声信号的状态下自动计算振动传感器的输出的峰值的平均值而自动设定信号电平时,也可以自动跟踪,基于 获得的平均值,并根据峰值和信号电平的平均值自动计算阈值电平。