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Patent Searching and Data


Matches 651 - 700 out of 800

Document Document Title
JPS61218297A  
JPS6141461B2  
JPS61194931A
PURPOSE: To transmit data while a data bit is added to a voice signal coded bit by superimposing a single frequency signal on a voice signal from the transmission side, coding and transmitting the result and switching the code rule corre...  
JPS61156935A  
JPS6162251A
PURPOSE: To make realization of hardware easy and to reduce errors in data by giving spectrum shaping characteristic for shaping transmission characteristic from the input end of a modulating circuit section to the output end of a demodu...  
JPS6162250A
PURPOSE: To reduce a hardware by applying a common modulator-demodulator circuit using a digital transmultiplexer for inserting a converting circuit, which converts a sampling frequency. CONSTITUTION: A FDM (frequency division multi) sig...  
JPS6157136A
PURPOSE: To attain high quality and multi-channel transmission of a PCM music signal using a CATV line by transmitting plural signals subject to time division multiplex from plural analog signals while they are subject to frequency divis...  
JPS619044A
PURPOSE: To attain circuit integration, miniaturization and to transmit a picture and sound with high quality by utilizing sufficiently the advantage of digital multiplex. CONSTITUTION: Two kinds of sound signals 12, 13 are subjected to ...  
JPS619049A
PURPOSE: To attain distribution service of a video signal, a sound signal and a digital data signal to a subscriber by applying pulse coding (PCM) to a sound signal, applying time division multiplex (TDM) and angular modulation (PSK, FSK...  
JPS619063A
PURPOSE: To reduce the leakage of a difference frequency due to nonlinear distortion onto a video signal by applying angular modulation to digital informationa, multiplexing it with the video signal, selecting the said multiplexed signal...  
JPS619050A
PURPOSE: To obtain a signal selection system transmitting a video signal, a sound signal and a data signal to a subscriber by applying time division multiplex to plural pieces of digital information and also applying frequency division m...  
JPS60242736A
PURPOSE: To detect a fault where a hopping switch is interrupted or conducted by detecting respectively an input/output of the switch, using a control signal of the switch so as to compare both the detected waveforms and detecting the op...  
JPS60242737A
PURPOSE: To detect a fault where a hopping switch is interrupted or conducted by comparing an output signal of the hopping switch with a signal fed to the said switch to output the output signal. CONSTITUTION: If no output is fed to the,...  
JPS60185440A  
JPS60128735A
PURPOSE: To establish always synchronism with the best synchronizing signal even in a line where momentarily changing fading, radio interference, etc. exist, by establishing synchronism with a subchannel having the least error at a decod...  
JPS60121839A
PURPOSE: To facilitate FDM.TDM conversion by performing conversion processing separately in plural stages after an FDM signal is converted, and thinning out a sample signal in every stage and branching it into two in the next stage. CONS...  
JPS6025932B2  
JPS6019376A  
JPS6014541A
PURPOSE: To make a guard time unnecessary to improve the efficiency of line use by constituting a TDMA communication system so that a carrier frequency is different between adjacent time slots. CONSTITUTION: In this example, each time sl...  
JPS59231940A
PURPOSE: To prevent crosstalk from being caused and to prevent the deterioration in transmission efficiency by providing plural local oscillators, slowing down the switching period of s local oscillator signal less than the period of a t...  
JPS5948576B2  
JPS5948577B2  
JPS5940336B2  
JPS59134929A
PURPOSE: To attain small size, light weight and low power consumption by providing a crystal oscillator outputting a frequency at equal intervals of an input signal a means obtaining a frequency difference in the order of a local oscilla...  
JPS59134930A
PURPOSE: To attain small in size, light weight and low power consumption by using a microwave oscillator for a local oscillator, and providing a crystal oscillator outputting an oscillating frequency equal to a frequency at equal interva...  
JPS59134936A
PURPOSE: To improve an output signal distortion characteristic against the level fluctuation of an intermittent receiving signal by detecting a power value of a control signal to integrate it, applying a DC bias and comparing its output ...  
JPS5986927A
PURPOSE: To eliminate a relative frequency variation of an input signal and also to make a titled circuit small-sized and light as a whole by mixing and generating an oscillating signal of one oscillator and oscillating signals of M piec...  
JPS5972835A
PURPOSE: To transmit simultaneously two carrier waves through a single transmission system, by supplying time division pulses opposite to each other to the 1st and 2nd local transmission parts to obtain a time-divided intermediate freque...  
JPS593048B2  
JPS596637A
PURPOSE: To transfer the multiplex information of time division frequency, by multiplexing the time division multiplex information moreover in a frequency area, and transferring the digital signal as it is through an optical transmission...  
JPS58219843A
PURPOSE: To make electric power consume in accordance with the transmitting capacity of a signal to be transmitted, by supplying electric power to a power amplifier circuit only for a period including the time intervals during which a ca...  
JPS58173948U  
JPS58186236A
PURPOSE: To reduce earth station transmission power and to simplify the device, by using an FDMA system for an incoming line from an earth station for a communication sattellite and a TDMA system for an outgoing line from the communicati...  
JPS58145253A
PURPOSE: To monitor a failure at the inside of a device at all times, by monitoring a monitor signal produced as an analog signal at the outside of the band of an FDM signal in a PCM-TDM/SSB-FDM conversion. CONSTITUTION: A digital signal...  
JPS58145252A
PURPOSE: To monitor a failure in a device at all times, by providing a monitor signal in a vacant channel in SSB.FDM/PCM.TDM conversion. CONSTITUTION: An analog signal 30 having a specific frequency is inserted at the outside of band of ...  
JPS58124342A  
JPS58114538A
PURPOSE: To attain a simple test system for a TDM-FDM converter, by loading a simple system test device in which each channel carriers wave is switched to make it a test signal of a required channel in a group band, on the same frame as ...  
JPS5831060B2  
JPS5831063B2  
JPS58111548A
PURPOSE: To prevent the generation of harmonics produced at switching of a data signal, by inserting a filter in a control signal path of a switching device which starts and stops the transmission data. CONSTITUTION: In a transmission lo...  
JPS5884560A
PURPOSE: To prevent the spread of unnecessary waves of a burst signal, by switching when a code of modulation input is inverted at the leading and tailing edges of a burst signal, delaying or lapping the signal by ≥2-bit to generate th...  
JPS5866444A
PURPOSE: To improve the efficiency of transmission, by dividing a TDMA frame into plural time slots by means of plural types of optical signals of different wavelengths and permitting the simultaneous transmission of optical signals havi...  
JPS5851640A
PURPOSE: To obtain a modulation wave without unnecessary waves, by cutting off an input signal of a driver circuit at the pre-stage of a modulator or taking the signal as a constant voltage at the original station communication data burs...  
JPS5846496A  
JPS5839136A  
JPS5836042A
PURPOSE: To flexibly cope with variation in the quantity of communication of each individual subordinate station, by providing each subordinate station with an exclusive-use time zone and a common-use time zone. CONSTITUTION: When the qu...  
JPS5836041A
PURPOSE: To prevent interference with subordinate station data at a master station by stopping transmission from a subordinate station when a fault such as a step out, etc., occurs to a transmitted signal from the subordinate station. CO...  
JPS5817743A
PURPOSE: To improve substantial signal transmission speed, by using a frequency shift modulation wave with different channel number, and transmitting one digital signal on the same transmission path at the same time. CONSTITUTION: An out...  
JPS584853B2  
JPS585066A
PURPOSE: To obtain a small-sized, lightweight signal selecting circuit by multiplying low modulation frequencies of signals modulated at a low frequency, and then performing time-division frequency discrimination regarding the obtained s...  

Matches 651 - 700 out of 800