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111. 发明专利

JP2000059242A RECEIVER 失效
公开(公告)号：JP2000059242A
公开(公告)日：2000-02-25
申请号：JP22175398
申请日：1998-08-05
申请人： OKI ELECTRIC IND CO LTD
发明人： KATSURAGAWA HIROSHI
IPC分类号： H03D1/04 , H04B1/10
摘要： PROBLEM TO BE SOLVED: To reduce a DC offset generated at the analog circuit of a receiver executing digital signal processing. SOLUTION: A carrier wave including an information signal received by a receiving part 31 is demodulated by a demodulation part 33 and A/D converted by an A/D converter to become a digital signal. This receiver extracts a DC component from the digitized signal outputted from this part 19 by a digital low-pass filter 39 and executes feedback by using this DC component which can be regarded to be directly reflecting the DC offset.

112. 发明专利

JP2975375B2 失效
公开(公告)号：JP2975375B2
公开(公告)日：1999-11-10
申请号：JP50856288
申请日：1988-10-26
申请人： SEDOKOMU NETSUTOWAAKU SHISUTEMU PTY LTD
发明人： NIISEN HOORU ANTON , TOBIASU RAFUAERU
IPC分类号： H04B7/26 , G01S13/82 , G07B15/06 , H03D1/04 , H04B1/38 , H04B1/54 , H04B7/00 , H04K1/04 , H04M1/02 , H04Q7/32 , H04Q7/38
摘要： An apparatus is described for two-way communication between a controller and a communicator. The controller comprises a series of means adapted to generating a carrier signal and to deal with said signal to produce an informational signal. The communicator likewise comprises a series of means directed at producing a electromagnetic wave signal. In accordance with the invention the first means of the controller comprise means to vary the frequency or phase of said carrier signal, and the means for demodulating a second modular carrier signal include means for mixing said carrier signal with said modulated carrier signal.

113. 发明专利

JPH11251959A INTERFERENCE CANCELER DEVICE AND RADIO COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH11251959A
公开(公告)日：1999-09-17
申请号：JP5325498
申请日：1998-03-05
申请人： FUJITSU LTD
发明人： TSUTSUI MASABUMI , TANAKA YOSHIAKI , KOBAYAKAWA SHIYUUJI
IPC分类号： H03D1/04 , H04B1/707 , H04B1/7107 , H04B7/216
摘要： PROBLEM TO BE SOLVED: To eliminate interference by a high-speed channel by a simple constitution related to an interference canceler device and a radio communication equipment in a DS-CDMA communication system for multi-rate transmission. SOLUTION: The DS-CDMA communication system for multi-rate transmission is provided with at least a low-speed channel and the high-speed channel, and the interference canceler device 3 equipped with an array antenna interference replica generation unit 5 for the high-speed channel to input reception signals corresponding to array antenna elements 1-1-1-m and to generate the interference replica of the high-speed channel. An adder 6 for outputting interference elimination signals for which the interference replica is subtracted from the reception signals by the array antenna elements 1-1-1-m is provided. The interference elimination signals from the interference canceler device 3 are inputted to receivers 4-1-4-k corresponding to the low-speed channel and the high-speed channel for demodulation.

114. 发明专利

JP2647107B2 失效
公开(公告)号：JP2647107B2
公开(公告)日：1997-08-27
申请号：JP50259987
申请日：1987-04-03
IPC分类号： H04B3/54 , H03D1/04 , H04B1/10 , H04B3/14

115. 发明专利

JPH07193522A METHOD FOR GENERATING MULTIPLEX DEMODULATION RECEPTION CIRCUIT 失效
公开(公告)号：JPH07193522A
公开(公告)日：1995-07-28
申请号：JP35488993
申请日：1993-12-24
申请人： OOMU KK , FUJI KK
发明人： OKADA YOSHIHIKO
IPC分类号： H03D1/04 , H04B1/16 , H04B1/30
摘要： PURPOSE:To obtain a simple and inexpensive circuit which can eliminate disturbance by means of an adjacent unnecessary signal by injecting the low frequency detection output of an ultra-reproduction reception circuit to the negative feedback amplifier circuit of a high input impedance, injecting the output to a low frequency tuning amplifier circuit and selecting/detecting the signal component of a specific frequency. CONSTITUTION:This circuit is composed of resistances R1-R11, capacitors C1-C9, an inductor L1, transistor Q1 and Q2 and an ultra-reproduction circuit SRG. The subsequent amplifying stage of the ultra-reproduction circuit SRG is set to be the high input impedance. A tuning amplifier circuit making a frequency characteristic to be flat to a wide area by the high input impedance negative feedback amplifier circuit and selecting/amplifying a carrier signal component since a sub-carrier signal detected in the ultra-reproduction circuit SRG includes a comparatively high frequency component is provided. When a multiplex modulation transmission signal radio wave is received, the sub-carrier signal of a comparatively high frequency is detected in the ultra-reproduction circuit SRG, and only the sub-carrier signal component is amplified in a tuning amplifier so as to eliminate the adjacent unnecessary signal.

116. 发明专利

JPH06276027A DEVICE FOR DETECTING AMPLITUDE-MODULATED CONTIGUOUS DISTURBANCE BY FREQUENCY MODULATION 失效
公开(公告)号：JPH06276027A
公开(公告)日：1994-09-30
申请号：JP5904093
申请日：1993-03-18
申请人： FUJITSU TEN LTD
发明人： SASAKI MITSURU , SASAKI KAZUTOSHI
IPC分类号： H03D1/04 , H03D1/22 , H04B1/10 , H04B1/26
摘要： PURPOSE:To improve the amplitude-modulated contiguous disturbance detecting device. CONSTITUTION:The contiguous disturbance detecting device for the amplitude modulated signal by frequency conversion which receives the upper and lower side wave signals of the amplitude-modulated signal, detects the side wave signal where a contiguous channel disturbing reception is present, and switches it to the side wave signal where the contiguous channel is absent is provided with contiguous channel shift parts 31 and 32 which shift an intermediate frequency signal generated by converting the amplitude-modulated signal from a high frequency at the time of reception with a reference signal shifted from its frequency by a certain quantity so as to discriminate between the frequencies of the contiguous channel signals of the upper and lower side wave signals by direct conversion and contiguous channel presence judgement parts 34, 35, 36, and 37 which extract the shifted contiguous channel signals thorugh filters corresponding to their frequencies and judge whether or not there are the contiguous channel signals.

117. 发明专利

JPH06276024A DEVICE FOR REMOVING AMPLITUDE-MODULATED CONTIGUOUS DISTURBANCE BY FREQUENCY MODULATION 失效
公开(公告)号：JPH06276024A
公开(公告)日：1994-09-30
申请号：JP6404893
申请日：1993-03-23
申请人： FUJITSU TEN LTD
发明人： SASAKI MITSURU , SASAKI KAZUTOSHI
IPC分类号： H03D1/00 , H03D1/04 , H03D1/22 , H04B1/10 , H04B1/26
摘要： PURPOSE:To remove disturbance of a contiguous channel through a demodulating circuit which performs the orthogonal transformation of an amplitude-modulated signal. CONSTITUTION:The amplitude-modulated contiguous disturbance removing device by frequency conversion as the demodulating circuit which demodulates the amplitude-modulated signal through the orthogonal transformation of an orthogonal transforming oscillator 8 is provided with contiguous disturbance removing filters 10 and 11 consisting of low-pass filters which are variable in cutoff frequency so as to remove contiguous channels and an amplitude- modulated conversion contiguous disturbance removing device 24 which converts the frequency of the amplitude-modulated signal and detects a contiguous channel, and increases or decreases the oscillation frequency of the orthogonal transforming oscillator 8 by a certain quantity and also decreases the cutoff frequencies of the contiguous disturbance removing filters 10 and 11 by a certain quantity according to the detected contiguous detected.

118. 发明专利

JPH06188637A DIRECT CONVERSION RECEPTION CIRCUIT 失效
公开(公告)号：JPH06188637A
公开(公告)日：1994-07-08
申请号：JP33759892
申请日：1992-12-17
申请人： FUJITSU TEN LTD
发明人： SASAKI MITSURU
IPC分类号： H03D1/04 , H03D1/22 , H04B1/30 , H04B1/68
摘要： PURPOSE:To provide a reception circuit in which the effect of an adjacent disturbing wave onto a frequency is less. CONSTITUTION:A received AM high frequency signal is inputted to a couple of mixers and 20, in which local oscillation signals whose phase differs from each other by about 90 deg. and having frequencies whose frequency difference is nearly equal to a carrier frequency kept constant by an FLL 49 are mixed. After outputs of the mixers 19 and 20 are given to a low pass filter and A/D- converted, and a phase deviation and a level difference of the input signal are corrected by using a digital signal processor (DSP) at a phase level compensation circuit 33. Both outputs from the phase level compensation circuit 33 are separated into an upper side wave and a lower side wave obtained as the sum and the difference of both the signals at a matrix circuit 34 and they are D/A-converted and sounded from a speaker 39 selectively.

119. 发明专利

JPH06177790A FM RECEIVER 失效
公开(公告)号：JPH06177790A
公开(公告)日：1994-06-24
申请号：JP19478993
申请日：1993-08-05
申请人： PHILIPS ELECTRONICS NV
发明人： HAINTSU RIYUNTERU
IPC分类号： H04B1/16 , G01R29/08 , H03D1/04 , H03D1/10 , H03J1/00 , H04B1/26 , H04B17/00 , H04H20/12
摘要： PURPOSE: To provide an FM receiver having a circuit device which quickly measures the field intensity of an FM transmitter. CONSTITUTION: The output signal of an FM demodulator 1 is applied to a comparator 5. The output of the comparator has a low amplitude or a high amplitude, and integrator stages 9, 10, and 11 are provided in the following stage of the comparator, and the output signal of integrator stages has a high amplitude only when the output signal of the FM demodulator 1 is suitable for measurement of the field intensity.

120. 发明专利

JPH063473B2 失效
公开(公告)号：JPH063473B2
公开(公告)日：1994-01-12
申请号：JP3382685
申请日：1985-02-22
申请人： NIPPON ELECTRIC CO
发明人： OOBA HIDEO
IPC分类号： G01R19/145 , G01R19/00 , G01R19/165 , G01R19/22 , H03D1/04 , H03D1/10

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