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Patent Searching and Data


Matches 651 - 700 out of 805

Document Document Title
JPS6248421B2  
JPS6259432A
PURPOSE: To attain miniaturization and stable conversion by converting a frequency division multiplex signal into a complex number signal, applying frequency conversion and digitizing, using a chirp signal generator and a chirp filter to...  
JPS6234435A
PURPOSE: To simplify the circuit configuration of an order circuit equipment, by changing call signals and carriers under a time sharing condition by means of switches. CONSTITUTION: By providing a transmission-side switch 2 and receptio...  
JPS6226947A
PURPOSE: To eliminate the deterioration of quality of voice by using a data path through which a voice signal is sent at voice communication to send a control signal comprising a prescribed frequency signal thereby simplifying the consti...  
JPS6159020B2  
JPS61218297A
A master station communicates with the main network, whilst a set of mobile or fixed sub stations of voice or data users share the channel using time division multiplexing. The number of time division channels available depends on the qu...  
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
A method and apparatus for use in a digital radio transmission system comprising stationary radio stations arranged in a cellular network and to which are assigned a plurality of mobile radio stations. Transmission of digital messages fr...  
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
A system for the digital conversion of a time division multiplex signal into a frequency division multiplex signal wherein the signals of the individual time multiplex channels are filtered by means of bandpass filters, their sampling ra...  

Matches 651 - 700 out of 805