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JPS5948576B2 |
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JPS5948577B2 |
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JPS5940336B2 |
TDMA INTERTRANSPONDER COMMUNICATION Groups of stations operate in TDMA mode relative to associated frequency-separated transponder segments of a satellite repeater. Stations at radio signaling nodes in all groups key to a common frame ti...
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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...
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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...
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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 ...
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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...
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JPS593048B2 |
A method and a system are disclosed for synchronizing within a recurrent time frame the starting points of the transmissions from the various stations in a TDMA network wherein N stations distributed among M separate zones covered by M d...
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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...
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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...
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JPS58173948U |
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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...
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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...
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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 ...
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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 ...
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JPS5831060B2 |
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JPS5831063B2 |
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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...
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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...
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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...
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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...
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JPS584853B2 |
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JPS57168517A |
A digital filter bank (10) which has a discrete cosine transform section (12) and a polyphase network section (14) has the polyphase network section configured with a plurality of single input-double output digital filters (16). The filt...
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JPS5745391B2 |
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JPS57142046A |
PURPOSE: To reduce the deviation in carrier wave frequency between slave stations and to make the demodulation at a master station easy, by controlling the carrier frequency of a burst shape modulating signal from the slave stations to t...
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JPS57118450A |
PURPOSE: To have the mutual connection among the channels excepting a branching circuit without lowering the circuit quality, by performing the branching and inserting of an optional channel signal at the stage of the PCM primary group s...
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JPS57111151A |
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JPS57103448A |
PURPOSE: To reduce the number of kinds of filter, by inverting the frequency spectrum of the TDM signal of every other channel and by synthesizing N-number two-channel components of the FDM signal from the TDM signal of two continuous ch...
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JPS5791047A |
PURPOSE: To enable a duplex signal less in deterioration of digital signal, by removing the low frequency component of a digital signal, transmitting the signal of band suited to this low frequency through synthesis, and reproducing the ...
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JPS5784641A |
PURPOSE: To enable various measurements arbitrarily from an audio signal side, by folding the audio signal with a transmultiplexer via one channel of PCM multiplex signal. CONSTITUTION: An audio signal is coded at 13 by a monitoring circ...
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JPS5719619B2 |
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JPS5719620B2 |
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JPS5717583Y2 |
1482971 Data transmission SIEMENS AG 24 July 1974 [6 Aug 1973] 32606/74 Addition to 1473941 Heading H4P In the digital transmission system of parent Specification in which digital signals are transmitted after frequency shifting by a fre...
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JPS57500580A |
A digital subscriber communications system for transmitting voice and data information is disclosed. The signal transmissions, on any suitable medium, are in an optimized sixteen bit per frame format with a framing bit in each frame. The...
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JPS577669A |
PURPOSE: To secure synchronous detection by giving two kind of modulated waves the same frequency component, by modulating the same carrier by two kind of base-band signals differing in frequency. CONSTITUTION: A switch 1 for switching b...
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JPS572143A |
PURPOSE: To reduce greatly the number of arithmetic circuits, by turning the complex signal of a time-division multiplex signal into a noncyclic digital filter signal in correspondence to channels and then synthesizing the noncyclic digi...
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JPS5654118B2 |
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JPS56149848A |
PURPOSE: To prevent deterioration of reliability of a signal, which is caused by a transmission loss and a noise, by transmitting a frame consisting of period of 1 bit, address of (m) bits and information of (n) bits, by means of two-pha...
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JPS56147300A |
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JPS5640540B2 |
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JPS56119545A |
PURPOSE: To make the device small-sized and lightweight and reduce the cost, without necessary synchronization by converting the input data signal to an analogue signal and by converting this analogue signal to the FM modulation wave of ...
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JPS56111347A |
PURPOSE: To improve transmission efficiency by transmitting news information, etc., from a master station to subordinate stations in time-division mode and by multiplexing return signals from the subordinate stations to the master statio...
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JPS5694889A |
In an exemplary embodiment, subscriber lines are formed by means of light waveguides and transmit pulse-modulated TV signals in time-division multiplex. These pulse-modulated signals are converted into PAM signals at the subscriber side,...
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JPS5691547A |
PURPOSE: To enable simple constitution to convert an IDM (time-division multiplex) signal into an FDM (frequency-division multiplex) signal and reversely, by using a means of adding and subtracting of complex signals of a plurality of ch...
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JPS5631798B2 |
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JPS568529B2 |
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JPS567623B2 |
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JPS561818B2 |
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JPS5546093B2 |
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JPS5537890B2 |
System for digitally converting baseband channel signals into a frequency-division multiplex signal. The system comprises at its input converter circuits by each of which the sequence of codewords of the digital signal which correspond t...
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