摘要:
A variable equalizer adapted to be fabricated in an integrated circuit structure and having improved compensation characteristics comprises a parallel connection of two circuits, one including a series connection of a first impedance circuit (impedance: Zy) and an input A.C. signal source circuit having a voltage v.sub.i, the other comprising a series connection of a second impedance circuit (impedance: Z.sub.x) and an A.C. signal source circuit having a voltage amplitude v.sub.z which is equal to v.sub.i (K/Z.sub.y).sup.2, where K is a constant, and the second impedance circuit, consists of a variable resistor.
摘要:
A method and system for information processing in a bidirectional information transmission system, particularly for transmitting information in accordance with a change in a transmission capacity of a transmission line. A system is provided which can change an information transmission rate in accordance with a room capacity of a transmission line. This information transmission system includes a plurality of information providers, a plurality of information receivers, an information storage and distribution unit connected to the information providers and receivers, and a plurality of information transmission lines for information transmission between the information providers and receivers and the information storage and distribution unit, wherein the information transmission rate of each information transmission line is changed.
摘要:
A method and system for information processing in a bidirectional information transmission system, particularly for transmitting information in accordance with a change in a transmission capacity of a transmission line. A system is provided which can change an information transmission rate in accordance with a room capacity of a transmission line. This information transmission system includes a plurality of information providers, a plurality of information receivers, an information storage and distribution unit connected to the information providers and receivers, and a plurality of information transmission lines for information transmission between the information providers and receivers and the information storage and distribution unit, wherein the information transmission rate of each information transmission line is changed.
摘要:
Data transmission and recovery, in either the optical or the electrical domain, can be accomplished with mBnB encoding with the violation of one or more of the n code pulses for multiplexing overhead signals, with a carried clock being indicated by periodic fixed position transitions, and with both extraction of the clock and demultiplexing of the overhead signals being accomplished with only logical processing and signal delay. For the above, transmission and processing in only the optical domain can be easily obtained as well as a circuitry that can be constructed cheaply and on a small scale, particularly by integration on a single substrate. The logical processing involves logical combinations of two or more of the received encoded signal, a delay of the received encoded signal, an output of a previous logical combination, and a delayed output of a previous combination, an extracted clock, and a frequency division or a frequency multiplication of an extracted clock.
摘要:
In a time division multiplexing system for multiplexing a plurality of channels having mutually-independent bit rates, the improvement wherein the pulse signals of each channel are converted into codes so that the information "1" is represented by a pulse having a width of two consecutive transmission clock periods ("0,0" or "1,1") the information "0" is represented by a pluse having a width of a single transmission clock period ("0" or "1"), and polarities of adjacent pulses are always different from each other; the pulse signals are compressed time-wise in a frame unit; and a frame synchronizing signal and a channel synchronizing signal, each consisting of marks or spaces having a duration of at least three consecutive transmission clock periods, are added to the intervals between the time-compressed frames to thereby perform time division multiplexing.
摘要:
A variable equalizer whose frequency characteristic varies in a range of 1-1/Y(f).sup.2when the gain x of a variable amplifier varies from 0 (zero) to .infin. (infinity), and which reduces the number of shaping networks for the variable frequency characteristic.It is constructed of a forward pass circuit which consists of a variable amplifier and a frequency-dependent first circuit connected in the order mentioned between input and output terminals, a feedback pass circuit which is dependent upon the frequency and which feeds-back an output of the variable amplifier to an input thereof, and a feed forward pass circuit which is independent of the frequency and which feeds forward part of the input of the variable amplifier to an output of the first circuit.
摘要:
A communication network system includes a communication line, a plurality of communication stations each having a node coupled to the communication line and a network controller coupled to the stations for controlling routing for communication messages between nodes. In one embodiment, the messages are sent from plural terminals connected with each node along with communication performance prerequisites. The communication performance prerequisites for a communication message are discriminated in the node which receives the message. Traffic in various routes between the nodes is continually measured in the communication stations and the measuring results are stored in a database storage unit. Future traffic in the various routes is predicted on the basis of the information on the continually measured traffic by the use of a predetermined algorithm and stored in the storage unit for use in determination of routes for communication messages on the basis of the result of the communication performance prerequisites discrimination and predetermined criteria with respect to the updated information on the predicted traffic in the storage unit.
摘要:
The invention provides a communication method and system for use in a network for digital data exchange/transfer through a circuit switched network. According to the method and system, a call is given the attribute of an intermittent transfer mode, and a device for identifying attributes is provided on network controls in connection paths so that the network control establishes a path only in response to a data transfer request from identified call and releases the path when the call is held on standby for data transfer.
摘要:
A digital signal transmission system which converts first digital signals having a given bit rate into second digital signals having a predetermined bit rate to transmit them. The first digital signals are written into a buffer memory at a bit rate of the first digital signals, and the written signals are read from the first buffer memory at a bit rate of said second digital signals. The reading of the digital signals is carried out with a clock signal which consists of synchronous portions that read the written signals at any time and asynchronous portions that read the written signals depending upon the condition of the written signals. The second digital signals are sent after adding a data signal to the asynchronous portions of the digital signals. A second buffer memory receives the sent second digital signals and temporarily stores them by writing the second digital signals at the bit rate of said second digital signals, and reading the written signals from the second buffer memory at a bit rate of the third digital signals, the reading of the third digital signals depending upon signals of the asynchronous portions of the second digital signals.
摘要:
A small-sized LSI variable equalizer is provided for accurately equalizing waveforms of signals transmitted via transmission lines of different distances. Variable equalizer units capable of stepwise changing the equalizing characteristics thereof are connected in series with each other with the variable equalizer units having variable step widths different from each other. An output signal of the variable equalizer units is compared with a reference signal to convert the comparison output signal to a digital signal which includes an upper order bits and lower order bits, whereby one of the equalizer units which has a wide variable step width is controlled by the upper order bits and the other of the equalizer units which has a narrow variable step width is controlled by the lower order bits.