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Patent Searching and Data


Matches 701 - 750 out of 800

Document Document Title
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 ...  
JPS57168517A  
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 ...  
JPS5745391B2  
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...  
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...  
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...  
JPS57111151A  
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...  
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...  
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 ...  
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...  
JPS5719619B2  
JPS5719620B2  
JPS5717583Y2  
JPS57500580A  
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...  
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...  
JPS5654118B2  
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)...  
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...  
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...  
JPS56147300A  
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...  
JPS5640540B2  
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 ...  
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...  
JPS5694889A  
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...  
JPS5631798B2  
JPS5660342U  
JPS5636247A  
JPS568529B2  
JPS567623B2  
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 ...  
JPS561818B2  
JPS5546093B2  
JPS5537890B2  
JPS5532256B2  
JPS5520413B2  
JPS5513659B2  
JPS5541092A  
JPS5541094A  
JPS5512202Y2  
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...  
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 ...  
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...  
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...  
JPS54156411A  
JPS54134917A  

Matches 701 - 750 out of 800