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    • 9. 发明申请
    • DEMODULATION APPARATUS AND METHOD FOR OPERATING THE SAME
    • 解调装置及其操作方法
    • US20140118061A1
    • 2014-05-01
    • US14047810
    • 2013-10-07
    • LSIS CO., LTD.
    • Chel Ho CHUNGYoung-Han KIM
    • H03D1/02
    • H03D1/02H04B5/0062H04L27/06
    • A demodulation apparatus comprises: an envelope detecting unit configured to receive a signal from the outside and detect an envelope signal from the received signal; a reference voltage generating unit configured to generate a reference voltage on the basis of the detected envelope signal; a comparator configured to output a pulse signal on the basis of the envelope signal detected by the envelope detecting unit and the reference voltage generated by the reference voltage generating unit; and an input signal adjusting unit connected with an envelope signal input terminal of the comparator to selectively adjust a magnitude of the envelope signal input to the comparator.
    • 解调装置包括:包络检测单元,被配置为从外部接收信号并从接收信号检测包络信号; 参考电压产生单元,被配置为基于检测到的包络信号产生参考电压; 比较器,被配置为基于由包络检测单元检测到的包络信号和由参考电压产生单元产生的参考电压输出脉冲信号; 以及与比较器的包络信号输入端连接的输入信号调整单元,以选择性地调整输入到比较器的包络信号的幅度。
    • 10. 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。