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1. 发明专利

JPS6248180A EQUIPMENT FOR REMOVING RECEIPT INTERFERING WAVE FOR TELEVISION SIGNAL 失效
公开(公告)号：JPS6248180A
公开(公告)日：1987-03-02
申请号：JP18906385
申请日：1985-08-27
申请人： FUJITSU LTD , JAPAN BROADCASTING CORP
发明人： KIDENA MINORU , SUZUKI SHINJIRO , OGINO MASAO , ICHIKAWA KAZUYOSHI
IPC分类号： H04N5/21
摘要： PURPOSE:To detect an interfering wave and remove it by providing a high frequency switch for changing over a signal passage so as to pass an intermediate frequency signal of a television signal through a receipt interfering wave removing system during detecting the receipt interfering wave by a receipt interfering wave detecting system. CONSTITUTION:When the existence of an interfering wave is detected with respect to an intermediate frequency signal of a television signal inputted to an input terminal (JI) by a receipt interfering wave detecting system consisting of a frequency converter 9, a phase synchronous oscillator 10, a band-pass filter 11, a detector 12, a low pass filter 13, a logarithmic amplifier 14, an analog switch 15, an analog-digital converter 16, memories 17, 18 and a processor 19, the processor 19 drives high frequency switches 2, 6 to change over the intermediate frequency signal so as to pass through a receipt interfering wave removing system including a converter 3, a band stop filter 4 and a frequency converter 5. Thereby, a spectrum component of the interfering wave is automatically detected and can be removed.

2. 发明专利

JPS55138932A PARALLEL OPERATION SYSTEM OF HETERODYNE REPEATING DEVICE 失效
公开(公告)号：JPS55138932A
公开(公告)日：1980-10-30
申请号：JP4695879
申请日：1979-04-17
申请人： FUJITSU LTD , JAPAN BROADCASTING CORP
发明人： TANAKA TAKEYA , OGINO MASAO , KIDENA MINORU , HATSUTORI SHIYUUJI , OZAKI YASUMI , ICHIKAWA KAZUYOSHI
IPC分类号： H04B1/74 , H04B7/15 , H04B7/155
摘要： PURPOSE:To elevate both economy and reliability simultaneously, by using the multiple processing parts in common for each channel and also making it a duplex constitution. CONSTITUTION:An input signal of each channel CH1-CHn is branched by the branching filters H1-Hn, the branched waves are added to the multiple processing parts MUL1, MUL2, respectively, they are subjected to frequency conversion an amplification all together by a signal from the station signal source LS, and subsequently they are added to the first and the second branching filters HD1, HD2. And they are separated to each channel signal corresponding to the output side channels CH1'-CHn' by the branching filters H11-H1n, H21-H2n of the branching filters HD1, HD2, and a signal of the same channels is compounded by the phase compound parts SM1-SMn and is sent out to the output side channels CH1'- CHn'.

3. 发明专利

JPS6248181A EQUIPMENT FOR DETECTING RECEIPT INTERFERING WAVE FOR TELEVISION SIGNAL 失效
公开(公告)号：JPS6248181A
公开(公告)日：1987-03-02
申请号：JP18906485
申请日：1985-08-27
申请人： FUJITSU LTD , JAPAN BROADCASTING CORP
发明人： KIDENA MINORU , SUZUKI SHINJIRO , OGINO MASAO , ICHIKAWA KAZUYOSHI , KOMAI HARUO
IPC分类号： H04N5/21
摘要： PURPOSE:To detect a frequency and a level of an interfering wave by mixing an intermediate frequency signal of a television signal with a variable frequency signal, detecting through a band-pass filter, comparing a detected output with a prescribed comparison level and extracting a signal above the prescribed level. CONSTITUTION:An intermediate frequency signal of a television signal inputted to an input terminal JI is mixed with an output signal of a phase synchronous oscillator 18 in a frequency converter 1 and converted into the second intermediate frequency signal. An output frequency of the phase synchronous oscillator 18 is successively changed and the second intermediate frequency is changed, and then, an output signal of a band-pass filter 7 scans in a band of the intermediate frequency signal and an output signal of a detector 8 appears as a spectrum of a video signal. Then, in a low-pass filter 9, only a synchronous signal component and a carrier wave component are obtained, only when the synchronous signal component passes through the band-pass filter 7 through a logarithmic amplifier 10, an analog switch 11 is turned off and only an interfering wave component is obtained. It is recorded in a memory 13 through an A/D converter 12, a frequency of a memory 14 is made correspond to a maximum value and a signal is transmitted to an output terminal of a frequency and a level.

4. 发明专利

JPS56169435A PHASE SYNCHRONIZATION OSCILLATOR 失效
公开(公告)号：JPS56169435A
公开(公告)日：1981-12-26
申请号：JP7310080
申请日：1980-05-31
申请人： FUJITSU LTD , JAPAN BROADCASTING CORP
发明人： OGINO MASAO , YOSHII KUNIKATSU , IGARASHI HIROSHI , ICHIKAWA KAZUYOSHI
IPC分类号： H03L7/00 , G01M7/00 , H03L7/22
摘要： PURPOSE:To make the oscillating circuit of both systems to the same constitution completely, by enabling to produce two output signals in phase synchronism individually and at the some time through the use of two PLL ocillators. CONSTITUTION:An output signal of a voltage controlled oscillator VCO21 is fed back to a phase detector 22 and it is in phase comparison with the output signal of a VCO24. The output of the phase detector 22 is fed to the VCO21 via an LPF23 to control the oscillating frequency. On the other hand, the output of the VCO24 is fed back to a phase comparator 25 and it is compared for the phase with the output signal of the VCO21, and the output of the phase comparator 25 is converted into a DC signal via an LPF26 to control the frequency of the VCO24. Thus, if the characteristics of two PLL oscillators are equal, the oscillating frequency of the VCOs 21 and 24 is converged to (f1+DELTAf1/2) respectively and finally. Thus, independent signals having the frequencies of f1+DELTAf1 and f1 can be obtained from the terminals No.1 and No.2, respectively.

5. 发明专利

JPS5784695A CONTROL CIRCUIT FOR TRANSMISSION FREQUENCY 失效
公开(公告)号：JPS5784695A
公开(公告)日：1982-05-27
申请号：JP16166080
申请日：1980-11-17
申请人： FUJITSU LTD , JAPAN BROADCASTING CORP
发明人： IGARASHI HIROSHI , KIDENA MINORU , ICHIKAWA KAZUYOSHI
IPC分类号： H04B1/04 , H04N9/00
摘要： PURPOSE:To achieve highly stable transmission frequency without using high cost and highly stable quartz oscillator, by utilizing a color burst signal of a reception signal. CONSTITUTION:An output of a color burst signal pickup circuit 50 is applied to a frequency divider 54 via the 1st PLL circuit consisting of a phase comparator 51, loop filter 52 and voltage controlled oscillator 53 and frequency divided 63. The frequency-divided output is applied to the 2nd PLL circuit consisting of circuits of 55-58 (the oscillation frequency of a voltage controlled oscillator 57 is 1MHz). The output signal of this PLL circuit is applied to frequency division circuits 59, 65 to output a signal having the frequency in frequency lock to the color burst signal by taking the output of a high order multiplier 61 and a frequency divider 60 by a mixer 62.

6. 发明专利

JP2001326579A TRANSMISSION EQUIPMENT 失效
公开(公告)号：JP2001326579A
公开(公告)日：2001-11-22
申请号：JP2000141478
申请日：2000-05-15
申请人： HITACHI INT ELECTRIC INC , JAPAN BROADCASTING CORP
发明人： KAWAGUCHI EIJI , HISAMATSU MINORU , SUZUKI MASARU , KAWAMURA SHIGERU , MORIYAMA KAZU , ITO SEIICHIRO , NISHIDA ISATO , ICHIKAWA KAZUYOSHI , ABE TORU
IPC分类号： H04N5/38 , H04B1/04 , H04H20/00 , H04H20/06 , H04H1/00
摘要： PROBLEM TO BE SOLVED: To provide transmission equipment in which switching can be made without hit in the fault of a transmitter and is suited to sharing among plural programs in particular while conventional transmission equipment has a problem of generating hit when switching to a reserve transmitter when an active transmitter is broken. SOLUTION: When a No.1 transmitter 1 and a No.2 transmitter 2 are normal, transmission output is composed and outputted by a composing device 14 via a distributor 6 and a switch circuit 10 and via a distributor 7 and a switch circuit 11. When the No.1 transmitter 1 is broken, the transmission output of the No.2 transmitter 2 is composed and outputted by the composing device 14 via a distributor 7 and switch circuits 9 and 10 and via the distributor 7 and the switch circuit 11. When the No.2 transmitter 2 is broken, the transmission output of the No.1 transmitter 1 is composed and outputted by the composing device 14 via the distributor 6 and a switch circuit 101 and via the distributor 6, switch circuits 8 and 10.

7. 发明专利

JPS56776A PARALLEL RUNNING SYSTEM FOR TV RELAY BROADCAST UNIT 失效
公开(公告)号：JPS56776A
公开(公告)日：1981-01-07
申请号：JP7460379
申请日：1979-06-15
申请人： OKI ELECTRIC IND CO LTD , JAPAN BROADCASTING CORP
发明人： KOURO KENJI , HATSUTORI SHIYUUJI , OZAKI YASUMI , ICHIKAWA KAZUYOSHI
IPC分类号： H04B7/15 , H04N5/00 , H04N7/14
摘要： PURPOSE:To enable the prevention of momentary interruption of output signal, by all the systems in parallel which are controlled in the same phase and output with synthesis. CONSTITUTION:The reception signal from the signal input terminals IN1, IN2 is fed to No.1 reception system (reception conversion section RX1 and local oscillator LO1) and No.2 reception system (RX2, LO2) and then fed to the phase synthesis section PSC after conversion, and the local oscillator LO2 is controlled so that the phase difference is zero and fed to the transmission system SER-2 with synthesis. When this signal is received at the transmission conversion sections TX1, TX2, it is converted at the local oscillation signal from the local oscillation synthesis section LOC and fed to the circulator synthesis section CIR, and synthesized at a plurality of circulators provided in it into output. In the local oscillation and synthesis section LOC, the local oscillators LO3, LO4 in parallel operation receives specified phase control, and the output is output with synthesis.

8. 发明专利

JPH11205280A TRANSMISSION DEVICE AND RECEPTION DEVICE 失效
公开(公告)号：JPH11205280A
公开(公告)日：1999-07-30
申请号：JP603798
申请日：1998-01-14
申请人： JAPAN BROADCASTING CORP
发明人： TATSUMI YUKIO , FUJIO HIROKI , FUJITA HIROSHI , NOJI SHOICHI , ABE TORU , ICHIKAWA KAZUYOSHI
IPC分类号： H04J1/02 , H04J11/00 , H04N5/00 , H04N7/00 , H04N7/08 , H04N7/081
摘要： PROBLEM TO BE SOLVED: To set the frequency shift of local signals on reception device-sides arranged in respective repeating stations and a broadcasting place to be zero and to prevent the occurrence of swing in local oscillation frequencies in the respective repeater stations at the time of constructing a network for ground digital broadcasting by an SFN(single frequency network) system. SOLUTION: A pilot signal is overlapped on the upper side (or lower side) of a spectrum constituting an OFDM(orthogonal frequency division/multiplex) signal so that it becomes the frequency which is slightly detached from the spectrum of the OFDM signal and it is transmitted from a transmission device. The reception device 11-side controls the oscillation frequency of a local oscillation part 12 based on a pilot signal in an IF signal obtained by frequency- converting a transmission signal.

9. 发明专利

JPH0654266A MICROWAVE TRANSMISSION SYSTEM 失效
公开(公告)号：JPH0654266A
公开(公告)日：1994-02-25
申请号：JP20143992
申请日：1992-07-28
申请人： JAPAN BROADCASTING CORP
发明人： ICHIKAWA KAZUYOSHI
IPC分类号： H04N5/40
摘要： PURPOSE:To reduce the beat component due to transmission characteristic, especially, intermodulation to increase the output up to the saturation output of a used device without degrading the picture quality by directly performing amplitude modulation in the SHF band to prevent expansion of the occupied band while simplifying the circuit constitution and eliminating the SHF amplitude part of a modulated wave to eliminate the nonlinear distortion. CONSTITUTION:A carrier signal of the SHF band is generated by an SHF local oscillation circuit 6 and is amplified by an SHF amplifying circuit 7, and an audio signal as the object is subjected to FM modulation by an FM modulating circuit 3 and is synthesized with a video signal as the transmission object by a video synthesizing circuit 5, and the carrier signal of the SHF band is subjected to AM modulation in an AM modulation circuit 8 by the composite signal obtained by synthesizing operation, and the vestigial sideband is cut by a VSBF circuit 9 to generate a transmission signal.

10. 发明专利

JP2002359578A DIGITAL RADIO TRANSMITTER 失效
公开(公告)号：JP2002359578A
公开(公告)日：2002-12-13
申请号：JP2001166922
申请日：2001-06-01
申请人： HITACHI INT ELECTRIC INC , JAPAN BROADCASTING CORP
发明人： YAMAGISHI YOSHINARI , ICHIKAWA KAZUYOSHI
IPC分类号： H04L1/22 , H04B1/74
摘要： PROBLEM TO BE SOLVED: To provide a digital radio transmitter, capable of preventing any data missing accompanied with the switching of a duplex system. SOLUTION: In this duplex system digital radio transmitter for cyclically inserting non-transmission data into transmission data, switching of the duplex data transmission system is limited to the transmission period of the non- transmission data. Since any data, which may be missed due to the switching, are limited to the non-transmission data, data which are to have been originally transmitted can be prevented from being missed.

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