公开(公告)号：US4866415A

公开(公告)日：1989-09-12

申请号：US145737

申请日：1988-01-19

申请人： Arata Obayashi ,  Ryohei Oba

发明人： Arata Obayashi ,  Ryohei Oba

IPC分类号： H04B1/10 ,  H04B1/00 ,  H04B1/04 ,  H04Q7/16

CPC分类号： H04B1/00

摘要： A tone signal is formed by repeatedly reading out digital data stored in a memory device. Thus a predetermined tone wavefrom signal is stored in the memory device as data corresponding to the amplitude value at a plurality of sampling points and the data are repeatedly read out at a predetermined speed. A quasi sine wave signal is formed based on the read out signal. Harmonic components are eliminated from the quasi sine wave signal with a lowpass filter, thereby forming a desired tone signal.

摘要翻译： 通过重复读出存储在存储装置中的数字数据来形成音调信号。 因此，来自信号的预定音调波作为与多个采样点处的振幅值相对应的数据存储在存储装置中，并且以预定速度重复读出数据。 基于读出信号形成准正弦波信号。 使用低通滤波器从准正弦波信号中消除谐波分量，由此形成期望的音调信号。

公开(公告)号：US4498195A

公开(公告)日：1985-02-05

申请号：US472246

申请日：1983-03-04

申请人： Tetsuo Ooi ,  Hiroshi Watanabe ,  Akio Gotoh ,  Shuitsu Tsutsumi ,  Ryohei Oba ,  Koichi Ito ,  Syouzi Huse

发明人： Tetsuo Ooi ,  Hiroshi Watanabe ,  Akio Gotoh ,  Shuitsu Tsutsumi ,  Ryohei Oba ,  Koichi Ito ,  Syouzi Huse

IPC分类号： H04B1/10 ,  H04B1/16

CPC分类号： H04B1/10

摘要： A radio interference detection device for use in a multi-channel access angle-modulation radio system. A detecting system detects a received signal prior to angle demodulation and produces an AM component of the received signal which is then rectified. A determining section then determines the level of the rectified signal for use in detecting interference in accordance with a determination result. The determining section includes an angle demodulator for angle-demodulating the received signal, a first comparator for comparing the angle-demodulated signal and the rectified signal, a second comparator for producing the detection signal when the rectified signal exceeds a predetermined level and a gate for passing the output signal from the second comparator only when the angle-demodulated signal is smaller than the rectified signal.

摘要翻译： 一种用于多声道接入角度调制无线电系统中的无线电干扰检测装置。 检测系统在角度解调之前检测接收到的信号，并产生接收信号的AM分量，然后被校正。 然后，确定部分根据确定结果确定用于检测干扰的整流信号的电平。 确定部分包括用于角度解调接收信号的角度解调器，用于比较角度解调信号和整流信号的第一比较器，当整流信号超过预定电平时产生检测信号的第二比较器， 只有当角度解调信号小于整流信号时，才从第二比较器传递输出信号。