TRANSMITTER AND RECEIVER AND IDENTIFICATION PATTERN TRANSMISSION METHOD AND IDENTIFICATION PATTERN DETECTION METHOD

A transmitter and an identification pattern transmission method thereof and a receiver and an identification pattern detection method thereof are provided. The transmitter includes a random sequence generator, a mapper and a resource allocation unit. The identification pattern transmission method includes following steps. A random sequence is generated. The random sequence is mapped to an identification pattern. The identification pattern is partitioned into a plurality of identification segments. The identification segments are allocated to a plurality of communication resource blocks to generate a transmitted signal having information of the identification pattern, where each of the communication resource blocks is spaced from another adjacent communication resource block by a predetermined number of symbols and/or a predetermined number of subcarriers. 1. A transmitter , adapted to transmit an identification pattern used for device-to-device communication , the transmitter comprising:a random sequence generator, generating a random sequence;a mapper, coupled to the random sequence generator, and mapping the random sequence to the identification pattern, wherein the identification pattern comprises a plurality of orthogonal frequency division multiplexing symbols on a plurality of subcarriers; anda resource allocation unit, coupled to the mapper, and partitioning the identification pattern into a plurality of identification segments, and allocating the identification segments to a plurality of communication resource blocks to generate a transmitted signal having information of the identification pattern, wherein each of the communication resource blocks is spaced from another adjacent communication resource block by a predetermined number of symbols and/or a predetermined number of subcarriers.2. The transmitter as claimed in claim 1 , wherein a number of the orthogonal frequency division multiplexing symbols in each of the identification segments is a positive ...

METHOD FOR TRANSMITTING AN UPLINK SIGNAL AND FEEDBACK INFORMATION, AND RELAY APPARATUS USING THE METHOD

The invention relates to a method of transmitting an uplink signal at a communication apparatus in a wireless communication system. The wireless communication system can receive pattern information of downlink subframes for a base station (BS)-to-the communication apparatus transmission as a bitmap; receive resource block (RB) information associated with a control channel for the BS-to-the communication apparatus transmission; receive the control channel from a fourth orthogonal frequency division multiplexing (OFDM) symbol of the downlink subframe n corresponding to a downlink subframe index n based on the RB information and the pattern information, the downlink subframe n comprising at least one downlink subframe other than downlink subframe 0, downlink subframe 4, downlink subframe 5 and downlink subframe 9; receive a data channel in the downlink subframe n; and transmit feedback information associated with the data channel to the BS via an uplink subframe for the communication apparatus-to-the BS transmission. 1. A method of transmitting an uplink signal at a communication apparatus in a wireless communication system , the method comprising:receiving pattern information of downlink subframes for a base station (BS)-to-the communication apparatus transmission as a bitmap;receiving resource block (RB) information associated with a control channel for the BS-to-the communication apparatus transmission;receiving the control channel from a fourth orthogonal frequency division multiplexing (OFDM) symbol of the downlink subframe n corresponding to a downlink subframe index n based on the RB information and the pattern information, the downlink subframe n comprising at least one downlink subframe other than downlink subframe 0, downlink subframe 4, downlink subframe 5 and downlink subframe 9;receiving a data channel in the downlink subframe n; andtransmitting feedback information associated with the data channel to the BS via an uplink subframe for the communication ...

FREQUENCY DIVISION DUPLEX WIRELESS COMMUNICATION APPARATUS AND METHOD

A Frequency Division Duplex (FDD) wireless communication apparatus is provided. The FDD wireless communication apparatus includes a first antenna configured to one of transmit and receive, a second antenna configured to receive, and a switch configured to selectively connect one of the first antenna and the second antenna to a receiver. 1. A Frequency Division Duplex (FDD) wireless communication apparatus comprising:a first antenna configured to one of transmit and receive;a second antenna configured to receive; anda switch configured to selectively connect one of the first antenna and the second antenna to a receiver.2. The FDD wireless communication apparatus of claim 1 , further comprising:a Low Noise Amplifier (LNA) connected between the second antenna and the switch.3. The FDD wireless communication apparatus of claim 1 , wherein a junction among the first antenna claim 1 , a transmitter claim 1 , and the switch is one of combination of a T-junction claim 1 , a transmission Surface Acoustic Wave (SAW) filter claim 1 , and a reception SAW filter claim 1 , a circulator claim 1 , and a duplexer.4. The FDD wireless communication apparatus of claim 2 , further comprising:a duplexer connected among the first antenna, a transmitter, and the switch;a first Band Pass Filter (BPF) connected between the second antenna and the LNA; anda second BPF connected between the switch and the receiver.5. The FDD wireless communication apparatus of claim 1 , further comprising a controller configured to control switching of the switch based on a received signal power level.6. The FDD wireless communication apparatus of claim 5 , wherein the controller connects the first antenna to the receiver through the switch if the received signal power level is greater than or equal to a threshold value claim 5 , and connects the second antenna to the receiver through the switch if the received signal power level is less than the threshold value.7. The FDD wireless communication apparatus of ...

METHODS AND SYSTEMS FOR FREQUENCY MULTIPLEXED COMMUNICATION IN DENSE WIRELESS ENVIRONMENTS

Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes receiving, at a first wireless device, a reference signal from an associated access point, the reference signal indicative of a time of joint transmission with at least a second wireless device. The method further includes transmitting a first communication to the access point based on the reference signal, the communication utilizing a first subset of wireless frequencies available for use. The first communication is concurrent with a second communication, from the second wireless device, utilizing a second subset of wireless frequencies, the second subset excluding the first subset. 1. A method of high-efficiency wireless frequency division multiplexing , comprising:receiving, at a first wireless device, a reference signal from an associated access point, the reference signal indicative of a time of joint transmission with at least a second wireless device; andtransmitting a first communication to the access point based on the reference signal, the communication utilizing a first subset of wireless frequencies available for use,the first communication being concurrent with a second communication, from the second wireless device, utilizing a second subset of wireless frequencies, the second subset excluding the first subset.2. The method of claim 1 , further comprising transmitting the reference signal in response to reception of a ready-to-send (RTX) frame at the access point claim 1 , the reference signal comprising a ready-to-send (RTX) frame comprising one or more of: a frame control field claim 1 , a duration field claim 1 , a source address field claim 1 , a destination address field claim 1 , and an information payload comprising one or more of the following indications: a requested transmission time claim 1 , the size of the queues for transmission claim 1 , a quality-of-service (QoS) indication for the requested transmission claim 1 , ...

Data communication system

Telephone system for sparsely populated areas

ТЕЛЕФОННАЯ СИСТЕМА ДЛЯ РЕДКОНАСЕЛЕННЫХ РАЙОНОВ, содержаща  спутник- св зи, центральную управл ющую станцию и наземные станции, кажда  из которых состоит из абонентского терминала, выходы которого подключены к первому входу первого частотного синтезатора и входу передатчика , приемника и второго частотного синтезатора, выкод которого подключен к входу абонентского терминала, а центральна  управл юща  станци  содержит коммутатор, блок управлени , выход которого через передатчик команд соединен с первым входом модул тора-демодул тора , второй вкод и выходы которого соединены соответственно с выходом передающего частот ного синтезатора,со входом приемника команд,выход которого подключен к входу блока управлени , и с входом приемного частотного синтезатора, выход которого подключен к входу коммутатора, выход которого соединен с входом передающего частотного синтезатора , отличающа с  тем, что, с целью уменьще и  времени ожидани  приема сигнальных данных вызова, в каждую наземную станцию введены два регистра, вентиль, элемент ИЛИ, одновибратор, элемент И, реле и детектор тона, выход которого подключен к второму входу первогочастотного синтезатора, соответствующир входы которого соединены с выходами п.ервого регистра, и к первому входу одновибратора, второй вход и выход которого соединены соответственно с выходом элемента И, первый i вход которого соединен с первыми входами регистров, и с управл ющим входом реле, которое соединено с входом абонентского терминала, выходы котоi рого соединены с входом детектора тона, вторым входом элемента И и перСО вым входом вентил , второй вход и выс ход которого соединены соответственно с первым выходом приемника и первым входом элемента ИЛИ, второй вхоД и выход которого соединены соответственно с первым выходом приемника и вторыми входами первого регистра и второго регистра, выходы которого :о эо подключены к входам второго частотного синтезатора, а на центральной управл ющей станции введены два ре;л гистра и декодирующий блок, выходы ...

Multidirectional radio communication system

Patent FR2224960B1

Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier

The electronic variable capacity switching system is used for telephone interconnection exchanges. The switching arrangement is connected to a common centre installation supplying subscriber sets by a single line common to the subscribers. This line is used to carry all control and speech signals. The centre contains all the switching groups together with automatic modulation and demodulation systems required to allow transmission of the signals to each subscriber set. An extendable ring counter works with a system of gates and electronic switches preventing cross coupling of lines. Each line has a carrier frequency modulated using a shift register, multiplexing system, oscillator, and a variable filter network.

Patent FR2268407A1

Patent FR2290810B1

PBX ground start trunk interface for station carrier systems

An interface circuit is disclosed for ground starting central office trunks connected via a station carrier system to a plurality of PBX subscriber terminals. The interface circuit extends ground start signals between central office sensing means and subscriber terminal control means over the high frequency transmission cable of a multiple-channel station carrier system. Associated with each of the plurality of multiple-channel units that interface central office terminal trunks to the carrier system are ground start sensing means multiply connected to ground start common circuitry. The ground start common circuit interprets signals from the ground start sensing means as to which of the voice frequency connecting pairs indicates a signal ground and subsequently forwards this information in the form of modulated intelligence on a discrete carrier over the high frequency transmission highway. At the PBX terminal, ground start control means are used to demodulate the transmitted intelligence and selectively control the subscriber terminal for voice frequency connection or battery reversal. The ground start control circuitry further includes means to initiate a ground start signal through the station carrier channel circuitry that is recognized by the ground start sensing means and used to alert the corresponding central office trunk of such a condition.

Ringer power generator circuit for subscriber carrier station terminal

Means for ringing over multiplex transmission channels

Patent FR2224960A1

Filter to secure privacy of carrier-derived telephone circuits

Disclosed herein is a filter adapted to be used in conjunction with carrier-derived telephone circuits, so as to insure privacy of that subscriber carrier circuit from intentional eavesdropping. In service, this filter is interposed between the subscriber carrier apparatus and the physical pair, being electrically in contact with each via appropriate connections. Basically, the filter is composed of three fundamental elements, a rectifier-low-pass filter combination electrically bridged by a high-pass filter. This three-element combination does not noticeably affect either carrier frequencies passing through the filter or normal voice frequency operation on the physical pair, but does weaken voice frequency signals sufficiently upon such passing through the filter so as to prohibit eavesdropping. Additionally, the rectifier-low-pass filter combination allows passage of voltage through the filter to permit use of the filter with carrier systems, which depend upon the voltage on the physical pair to power the subscriber unit or to maintain a charge on a battery located in the subscriber carrier apparatus.

Process and device for the extraction of organic acids and bases from beetroot molasses

Improvements in or relating to electrical carrier transmission systems

1,059,795. Multiplex radio systems; metering. TELEPHONE MANUFACTURING CO. Ltd. Oct. 12, 1965 [Oct. 23, 1964], No. 43294/64. Headings H4K and H4L. In a carrier telephone or telegraph system, a normally applied frequency of 3890 cycles is replaced during dialling impulses by a frequency of 3760 cycles, and for the purpose of metering the normal frequency is modulated at 20 cycles per second.

Circuit arrangement for calling high-frequency multiple telephone connections

Improvements to electrical systems for the transmission of signaling currents

Signal transmission system

Improvements in or relating to Carrier Telephony Equipment

1,178,693. Intercommunication systems; combined radio receiving and transmitting systems. GENERAL ELECTRIC & ENGLISH ELECTRIC COMPANIES Ltd. 2 June, 1967 [26 April, 1966], No. 18224/66. Headings H4K, H4L and H4R. In a carrier telephony intercommunication system each substation incorporates a local oscillator which is used both to frequency change incoming signals to an intermediate frequency to be amplified in an i.f. amplifier, and also as a carrier frequency for outgoing signals. The local oscillator in each substation is normally tuned to a frequency different from that of any other substation but is tunable to any one of a number of other frequencies to allow communication with any other substation on that substation's frequencies. Fig. 3 shows a substation circuit in which the local oscillator 22 comprises a self oscillating mixer tunable by push-buttons 1-20 to any one of 20 oscillator frequencies one of which is the normal call receiving frequency for the set and the remaining 19 allowing communication with any one of 19 similar sets. Incoming signals are fed from a coaxial line 21 to the base of mixer 23 through the tuned circuit 24, the i.f. signal being obtained in the collector circuit and fed via tuned transformer 26, i.f. amplifier 37, detector 38, and a.f. amplifier 39 to the receiver 40. Speech signals from the microphone 36 modulate the collector voltage of transistor 23, via the a.f. amplifier 35 and transformer 28, and cause the oscillatory output of the transistor to be amplitude modulated by the speech, the resulting signals being fed to the coaxial line via the output tapping on the oscillator coil 28. Normally, in a listening or called condition, the input circuit 28 is tuned to a frequency in a band from 985 to 1365 kc./s., at a frequency 470/kc./s., the i.f., below the output circuit 29, i.e. the oscillator or carrier output frequency, the different substations of one system being tuned to frequencies with 20 kc./s. spacing. On ...

Fast fourier transform window position recovery apparatus for an orthogonal frequency division multiplexing receiver

Carrier wave communication system

Synchronization detection apparatus and method based on orthogonal frequency division multiplexing

An orthogonal frequency division multiplexing (OFDM)-based synchronization detection apparatus including a 2 n level quantizing unit quantizing received data samples into levels of 2 n , where n is an integer greater than or equal to zero (0), and a delaying unit delaying the data samples quantized through the 2 n level quantizing unit by a predetermined number of clocks and outputting data indicative thereof. A shifting unit shifts the output data samples of the 2 n level quantizing unit by an amount corresponding to an exponent of the output data of the delaying unit and a peak detecting unit detects a peak value from sums of outputs from the shifting unit.

TERMINAL EQUIPMENT FOR A MULTIPLEX PHONE SYSTEM WITH CARRIER WAVES.

Powerline pulse signaling system

Device for carrier current traffic, in which the actual transmission processes are preceded by a selection or a call process, in particular for high-frequency telephony

Carrier operation of multistation telephone lines

Telephone carrier system having selfcontained independently attachable line tap units

Improvements in or relating to carrier current signalling systems

395,045. Wired wireless systems. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and WESTELL,. E. P. L., c/o General Electric Co., Stoke, Coventry. Jan. 30, 1932, No. 2202. [Class 40 (v).] In a carrier current system of communication, supervision or control, a pair of carrier channels is coupled by means capable of repeating selective impulses and comprising low-frequency or direct-current apparatus only, all carrier currents being passed through a rectifier or demodulator prior to affecting the coupler. The apparatus shown is adapted for connection at the left hand side to an extension set of terminals associated with a carrier set and selector mechanism of the type described in Specification 395,053 wherein the selector at a station is used both to direct incoming signals to the correct apparatus or to find an apparatus requiring to transmit a signal. Supervisory signalling from station having access to terminals 1 .. 10. When the transmitting station sends impulses a selecting switch (not shown) is stepped to connect the carrier set to terminals 1 .. 10. Relay 1R, 1A are then operated, relay 1R preparing " engaged " tone relay ET and 1A operating stepping magnet SS of the sequence switch. Upon the first step, 1B is operated to close a self-driving circuit for the switch over bank SS2, and initiate a call on the right hand carrier system at contact 1b4 and cause current of answering frequency to be transmitted to the calling station. If the right-hand channel is seized relay 2A is operated. Further impulses are then transmitted from the control station characteristic of the extension on the right hand carrier channel and are received as positive impulses at terminal 10 to step up the register switch RR. Relay C is energized during the train and released at the end' to operate the sequence switch SS two further steps. Further impulses are then transmitted indicative of the apparatus at the selected extension and are stored in the register RT ...

Connection signal conversion unit

Telephone system with line concentrators.

Communication system

Ringer guard circuitry for subscriber carrier telephone system

FREQUENCY MULTIPLEX SWITCH METHOD

Carrier current signalling system

676,792. Two-way transmission. DEHN, S. G. (Automatic Electric Laboratories, Inc.). Sept. 13, 1949, No. 23615/49. Class 40 (iv). In a carrier current communication system in which the carrier is used for signalling, a relay 4 for imposing ringing current on a voice frequency line 1, 3 is controlled by the potential across a sharply-tuned resonant circuit. In the embodiment shown, incoming carrier frequency currents from line 41 are applied to the resonant circuit comprising an inductance 85 and condensers 81 and 83 via a high-pass filter 37, lines 43 and 71, transformer 75 and line 35. The potentials across the tuned circuit control a valve 89, the output of which is rectified and fed back to the grid via resistor 113 to reduce the anode current and release the relay 4, which connects a ringing source to the V.F. line and switches in a resistor 67 to maintain the balance of a hybrid transformer 9. Ringing currents from the V.F. line operate a relay 27 which provides a path between a modulator 15 and the line 41 and cuts out a tuned circuit 49 and 57 which normally serves to suppress the carrier. The two-way transmission of speech currents through the single modulator 15 is the same as is described in Specification 672,729.

Signal information transmission system in digital carrier communication equipment

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Signaling emission device for power line equipment

Message transmission arrangement for connecting several subscribers to a central exchange

Control system

Concentric conducting system

TELEPHONE SYSTEM AND CONNECTIONS WITH MULTIPLE CHANNELS.

Ringer power generator circuit for subscriber carrier station terminal

In a subscriber carrier station terminal including a two-wire drop that is associated with a VF hybrid circuit and a handset thereof, a DC ringer voltage is generated by a DC-DC converter that is powered only during a ringing cycle. Power to drive the ringer in the handset is coupled to the two-wire drop through a pair of back-to-back (decoupling) diodes that are connected to the neutral terminal of the converter and relay contacts that are switched at the central office ringing frequency between +80 volt and -80 volt DC output lines of the converter. The VF hybrid is decoupled from the two-wire drop by a third diode during ringing. The converter is decoupled from the drop circuit by the back-toback diodes when voice signals are on the drop lines. Positive ring trip is provided during a ringing cycle by sensing the current transient produced in the drop when the associated subscriber carrier handset goes off hook in order to turn off the converter for a prescribed time interval to enable establishment of loop current and completion of ring trip.

Frequency multiplex switching system

1433969 Automatic exchange INTERNATIONAL STANDARD ELECTRIC CORP 21 May 1974 [22 May 1973] 22546/74 Addition to 1418447 Heading H4K In the switching system of the parent in which required interconnections are established by selecting corresponding frequencies of RF equipments coupled to respective antennae in a magnetically isolated space, the line terminal equipments each comprise detecting means for controlling switching operations in response to the receipt over the RF channel of one or several signalling frequencies, and sending means to transmit over the RF channel one or several signalling frequencies for switching purposes in a coupled terminal equipment, certain of the switching operations in the terminal units being effected by direct signalling from one to the other when a direct connection is established. The exchange apparatus, Fig. 2, comprises subscribers line circuits LA, incoming trunk circuits JA outgoing trunk circuits JD and auxiliary devices such as subscribers dialling junctors JN, outgoing senders EVD, incoming receivers RA and service line circuits LS all provided with an RF transmitter E and all except LS being provided with an RF receiver. Slow scanners EXL are DL in an interface unit for common control unit UCC determine conditions of subscribers lines and trunk lines respectively, and a fast scanner is supplied for alternative use in scanning the trunk lines. Markers MR set the frequencies of receivers R associated with the respective circuit units under the control of computer UCC. All the units of computer and interface are duplicated. A callers off-hook condition is indicated to common control UT by scanner EXL in response to the operation of relays L and A and after the class of the caller has been checked the controller selects an idle dialling junctor JN and supplies its number together with that of the caller to register RG of marker MR. The junctor sends modulated 450 Hz dialling tone over antennae 23 to the callers line circuit ...

Method and arrangement for the transmission of two different pieces of information in a single transmission channel with a given bandwidth on a carrier wave

Order circuit mechanism system for multi-direction multi-wireless circ uit

Emergency switching equipment for broadband transmission

In a telecommunication system having a central control unit and a telecommunication network wherein there are a plurality of stations interconnected by bidirectional primary links used during normal fault free operation and spare sections used when there is a fault in at least one of the primary links and wherein the central control unit initiates the changeover to selected spare sections upon detection of a fault, there is switchover apparatus in at least one of the stations and controlled by the central control unit for switching connections from primary links to space sections utilized by sub-routes.

IO port multiplexing line

一种IO口多路复用线路，包括：N个信号接收端，用于接收N个输入信号；每一所述信号接收端与每一所述输入信号一一对应连接；N个方波发生器，用于接收N个所述信号接收端上的N个所述输入信号，并将N个所述输入信号转换为N个互不相同的方波信号；每一所述方波发生器与每一所述信号接收端一一对应连接；IO口，用于接收N个所述方波信号；所述IO口分别与N个所述方波发生器连接；识别器，用于接收所述IO口上的N个所述方波信号，并利用自身中断对N个所述方波信号进行计数，以识别N个所述输入信号。本发明提供的一种IO口多路复用线路，可以通过一个IO口同时侦测两个或以上的输入信号，无需增加通道切换信号或通讯转换芯片即可侦测多个输入信号。

Signaling system for two-way dialing over radio and carrier telephone circuits

Improvements in or relating to modulated carrier wave communication systems

536,351. Multiplex systems. SIEMENS BROS. & CO., Ltd., and REED, M. Feb. 23, 1940, No. 3451. Drawings to Specification. [Class 40 (iv)] In a multiplex system in which modulation and de-modulation take place in two stages, auxiliary signals pertaining to a channel are applied to the second modulator at the sending end and are taken from the first de-modulator at the receiving end, where suitable filters are provided for effecting the separation. The signals control a receiving relay through a rectifier which may be preceded by a heterodyne stage. The Specification explains the considerations that govern the choice of frequency for the auxiliary signals to bring them between adjacent speech bands and to avoid spurious operation of the receiving relay by speech or by carrier leak. Specification 514,317 is referred to.

Remote test circuit for carrier telephones

Carrier telegraph system

Local area network above cable television methods and devices

A method and apparatus for modifying a cable network to create a local area network is disclosed. By employing a communications modem configured to transmit first communication signals over one or more coaxial cables using a first allocated spectrum designed to avoid contention with ongoing upstream television control signals, an infrastructure capable of carrying demand cable television and LAN signals can be created.

A method of reducing the effects of interruption in carrier circuits

878,605. Voice-frequency signalling. STANDARD TELEPHONES & CABLES Ltd. June 17, 1960, No. 21372/60. Class 40 (4). In a single or multi-channel system in which each channel employs VF signalling and a common pilot frequency is also transmitted, line interruptions of short duration are prevented from affecting the associated exchange equipment whereas an interruption of longer duration results in the release of any exchange equipment already seized. In Fig. 1, an " outband " signalling tone of 3825 c/s. is transmitted during the idle condition and a common pilot frequency of 104.08 kc/s. is transmitted continuously, relays RB, RC being maintained inoperative by the pilot detector DET and relay RA being energized over the tone contact of the signal receiver REC. An interruption of signalling tone gives a calling signal over line LE and relay RA falls back slowly. A break in the line has the same effect, but before the exchange relay has time to respond, its circuit is opened by the operation of RB which also makes a holding circuit for RA. If the break is of sufficient duration, say 10 or 20 seconds, RC also operates and releases RA. If a break in the line occurs after the signalling tone has been interrupted, RA is back and the operation of RB maintains the calling condition, unless the break is of sufficient duration to operate RC when the calling circuit is opened to release the exchange equipment. Rectifiers MR2, MR3 serve to isolate the channels from one another. In another arrangement, Fig. 2 (not shown), the signalling tone is transmitted during the busy condition. Instead of " outband " VF signalling, the system may employ 2-frequency " inband " signalling.

The generation method and device of a kind of broad sense Frequency Division Multiplexing system, fiber-optic signal

本发明实施例提供了一种广义频分复用系统、光纤信号的生成方法及装置，包括：获取信号源发送的原始信号；对原始信号进行概率成形处理，确定输出序列；对输出序列进行分层处理，得到多个分层输出序列；分别对每个分层输出序列进行LDPC编码处理，得到每个分层输出序列对应的信息序列；按照预设概率分布规则，将每个分层输出序列对应的信息序列映射到星座图上，得到GFDM系统的光纤信号。应用本发明实施例提供的技术方案，可以通过概率成形和可变码率的LDPC编码技术得到GFDM系统光纤信号，降低了信号传输的能量损耗，提高了编码效率，提高了误码性能和信道容量。

Party line telephone system

Schaltungsanordnung fuer Fernmeldeanlagen, bei der ausserhalb eines Nutzfrequenzbandes eine Einzelfrequenz uebertragen wird

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Signaling system

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Wechselstrom-Signaltastschaltung

백 채널 통신 기능을 갖는 고속 직렬화기／역직렬화기를 위한 주파수 분할 다중화의 이용

제1 전자 장치에 결합되는 제1 직렬화기/역직렬화기 및 제2 전자 장치에 결합되는 제2 직렬화기/역직렬화기를 포함하는 시스템이 제공된다. 제1 직렬화기/역직렬화기는 순방향 채널 드라이버를 포함하고, 제2 직렬화기/역직렬화기는 역방향 채널 드라이버를 포함한다. 통신 매체는 제1 및 제2 직렬화기/역직렬화기들 사이에 결합되고, 상기 제1 및 제2 직렬화기/역직렬화기들은 고주파수 순방향 채널을 제공하기 위하여 통신 매체에 AC 결합되고, 저주파수 역방향 채널을 제공하기 위하여 통신 매체에 DC 결합된다.

Multiplex signaling system

[UNK]

Einrichtung zur UEbertragung von Rufsignalen in Traegerfrequenztelephonie-Anlagen

Installations de commutation, notamment pour la téléphonie par courants porteurs

Carrier-wave communicating and switching system

Carrier-wave communicating system

Anordnung zur Eintastung von Außerbandsignalen in den Übertragungsweg einer trägerfrequenten Fernsprechübertragungseinrichtung

Dispositif pour l'établissement automatique de communications entre des usagers d'installations de connexion automatique à basse et haute fréquence

Method and means for simultaneously signaling all subscribers of carrier telegraph systems

Subscriber carrier telephone system

Verfahren und Anordnung zur Signalzeichenuebermittlung in Traegerfrequenz-Fernsprechsystemen

回線監視制御方式

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Traegerfrequenztelefoniesystem

Using frequency divisional multiplexing for a high speed serializer/deserializer with back channel communication

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Improvements in or relating to wireless receiving apparatus

Verfahren zur uebertragung von sinusschwingungen gleicher amplitude und frequenz in den kanaelen eines traegerfrequenzsystems

Verfahren zur UEbertragung von Sinusschwingungen gleicher Amplitude und Frequenz in den Kanaelen eines Traegerfrequenzsystems

Schaltungsanordnung fuer Hochfrequenztelephonie- und Hochfrequenztelegraphieanlagen mit Wahlanruf

bartha

Carrier-wave communicating and switching system

Anordnung zur Eintastung einer Außerband-Signalfrequenz

Wechselstrom signaltastschaltung fuer mehrkanal traeger frequenzsysteme

Schaltungsanordnung zur Tonfrequenzfernwahl in Traegerfrequenz-systemen mit Pegelregelung durch besonderen Steuerton

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Switching cct for obtaining closed loop criterion in subscriber lines - has resistance in one of two speech conductors as part of transistor cct

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Verfahren zur Auswahl von ueber mehrere Wahlstufen herzustellenden Verbindungen in Fernmelde-, insbesondere Fernsprechanlagen

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Schaltungsanordnung fuer Fernmeldevermittlungs-anlagen, insbesondere Fernsprechvermittlungs-anlagen mit Traegerfrequenzeinrichtungen

Verfahren zur hochfrequenten Nachrichtenuebermittlung laengs Leitungen

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Anordnung zur Eintastung von Ausserbandsignalen in den UEbertragungsweg einer traegerfrequenten Fernsprechuebertragungseinrichtung

Carrier communication system

Carrier-wave transmission and communicating system