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2. 发明授权

KR880000649B1 MULTIPLE TONE PIROT SIGNAL SYSTEM 失效
公开(公告)号：KR880000649B1
公开(公告)日：1988-04-19
申请号：KR820001928
申请日：1982-05-03
申请人： HAZELTINE CORP
发明人： LOUGHLIN BERNARD D
IPC分类号： H04B1/10 , H04H1/00 , H04H20/49 , H04H5/00
摘要： In the stereo radio system, tones are modulated on a carrier wave which is also multiplex modulated by stereo related audio signals. Detection of the presence of one of the tones in a received signal provides an indication of the possibility of stereo related modulation components in the received signal. Detection of the presence of both tones in the received signal provides confirmation that stereo related modulation components are in the received signal. In one form, 15HZ and 30HZ phaserelated tones are used. A stereo receiver incorporates 15HZ and 30HZ phase detectors which form interrelated phase-locked 100ps with a common 30Hz reference oscillator.

3. 发明授权

KR880000460B1 APPARATUS FOR DEMODULATING AN AM STEREOPHONIC SIGNAL 失效
公开(公告)号：KR880000460B1
公开(公告)日：1988-04-06
申请号：KR820001549
申请日：1982-04-06
申请人： SONY CORP
发明人： YOKOYA SATOSHI
IPC分类号： H04H1/00 , H04H40/36 , H04H5/00
摘要： A radio receiver with AM stereo signal demodulator uses left and right channel sum and difference signals. The design minimises noise burst interference and separation effects between left and right channels. A tuner produces an intermediate frequency and a subsequent detector separates the summed left and right signal plus signal level information. The 'IF' is also fed to circuits which process the left and right difference signals. The signal level information from the sum signal detectors is fed via a control circuit into the difference channel for phase modulation and comparison with the non-modulated signal and multiplication with it.

4. 发明公开

KR830000672A A M STEREO RECLIVER 失效
公开(公告)号：KR830000672A
公开(公告)日：1983-04-18
申请号：KR780002647
申请日：1978-08-31
申请人： HARRIS CORP
发明人： LEITCH CLIFFORD D
IPC分类号： H04H1/00 , H04H40/36 , H04H5/00
摘要： Radio receiver system for recovering stereo program signals from a composite stereo signal which has been modulated with either quadrature modulation or modified quadrature modulation techniques. In one embodiment, a receiver is provided which directly recovers the program signals from the composite signal by means of product detectors, without first converting the composite signal into an IF signal. In another embodiment an IF stage is provided, but is designed to have broad bandpass characteristics.

9. 发明授权

KR1019880000869B1 동기 포락선 검파기 失效
标题翻译：同步包络检测器
公开(公告)号：KR1019880000869B1
公开(公告)日：1988-05-26
申请号：KR1019820003876
申请日：1982-08-27
申请人： 레오나드리챠드카안
发明人： 레오나드리챠드카안
IPC分类号： H04H5/00
CPC分类号： H03D1/2245
摘要： The detector utilizes a received AM signal that has been translated into the I.F band and applies it to two product demodualtors. The carrier of the 1.F signal is isolated, e.g. by a phase-locked loop, and a corresponding quadrature carrier, i.e. the isolated carrier phase-shifted by 90 degrees, is generated. The carrier is applied to one of the demodulators and the quadrature carrier is applied to the other. The outputs of the demodulators are separatly squared and then added together. The square root of the resulting signal is taken in order to produce the final envelope-representative signal.
摘要翻译：检测器利用已经被转换成I.F频带的接收到的AM信号并将其应用于两个产品解调器。 1.F信号的载波是隔离的。通过锁相环产生对应的正交载波，即相移90度的隔离载波。载波被应用于解调器中的一个并且正交载波被施加到另一个解调器。解调器的输出被分开平方并加在一起。取出所得信号的平方根，以产生最终的包络代表信号。

10. 发明授权

KR860001325B1 AM스테레오 수신기용 보호 회로 失效
公开(公告)号：KR860001325B1
公开(公告)日：1986-09-13
申请号：KR830002528
申请日：1983-06-07
申请人： MOTOROLA INC
发明人： ECKLUND LAWRENCE M
IPC分类号： H04H1/00 , H04H40/36 , H04H20/49 , H04H20/88 , H04H40/45 , H04M5/00 , H04H5/00

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