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JPS57211846A |
PURPOSE: To remove unrequired waves due to a burst signal by adding specific bits when a data signal is limited at its band by a base band and changing the offset voltage of a modulator driver. CONSTITUTION: A specific signal to which â‰...
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JPS57168517A |
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JPS57166754A |
PURPOSE: To switch at the "0" point of the amplitude of a modulated wave and to prevent the entitled system from the generation of unnecessary waves due to switching, by adding specific bits to the front and back of a local transmission ...
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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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JPS57140049A |
PURPOSE: To stabilize a transmission frequency of a slave station, by inserting a non-modulation carrier to an FSK signal directed from a master to slave station, picking up this non-modulation carrier at the transmission of the slave st...
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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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JPS5797246A |
PURPOSE: To directly make TDM-FDM conversion and to simplify the constitution of a converter, by reducing the amount of operation together with an FIR filter and a modulation section. CONSTITUTION: An inputted 1 TDM multiplex signal is s...
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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 |
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JPS57500580A |
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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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JPS56161735A |
PURPOSE: To obtain the maximum ability of amplifiers at all times, by inputting signals having (n+1) types of frequencies while switching it to 2n sets of power amplifiers, and obtaining the amplified outputs of each frequency from (n+1)...
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JPS56161734A |
PURPOSE: To obtain a device which can make synchronization of clock and frame phase and pickup/separation of signaling information with a simple constitution, by using a specific circuit including an asynchronous memory circuit of readin...
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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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JPS56122545A |
PURPOSE: To reduce a noise amount converted at the output point by constituting a filter by combination of a discrete filter converting circuit and a noncyclic type polyphase filter group whose noise generating amount is a little, when a...
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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 |
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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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JPS5660342U |
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JPS5636247A |
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JPS568529B2 |
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JPS567623B2 |
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JPS5612152A |
PURPOSE: To simplify the unit and to make use of the frequency band effectively by increasing the number of subscribers by generating FT(frequency-time) addresses free from mutual interference by adding a fixed address appending circuit ...
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JPS561818B2 |
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JPS5546093B2 |
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JPS5537890B2 |
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JPS5532256B2 |
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JPS5520413B2 |
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JPS5513659B2 |
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JPS5541092A |
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JPS5541094A |
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JPS5512202Y2 |
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JPS5533335A |
PURPOSE: To realize the signaling signal detection system optimum to the FDM- TDM multiplication equivalence conversion system by securing nearly an equal setting value to both arithmetic process time of the multiplied filter and the del...
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JPS5520039A |
PURPOSE: To perform the decision for the slave stations via the monitor control signal without installing the extra circuit to the pilot signal but by using the monitor control signal contained in the signal sent from each slave station ...
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JPS5520038A |
PURPOSE: To secure the identification for the slave stations with a simple method without reducing the channel capacity by always inserting the pilot signal for slave station identification allotted to each slave station and then transmi...
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JPS54157024A |
PURPOSE: To improve an information transmission efficiency by providing a sub- channel multiplexed in the frequency division system on the same line or a sub- channel using another line besides the main channel, which transmits informati...
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JPS54156411A |
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JPS54134917A |
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