A method of processing signals from analogue telephony terminal equipment telephone and data from the target device data

 

The proposed method and device for signal processing can be used in telephone networks. Technical result achieved - ensuring the most favorable conditions for the transmission of data over analog subscriber line phone system. In connection with the transfer of analog subscriber lines of data are being processed otherwise than transmitted simultaneously analog speech signals. To do this, use the analog-to-digital conversion with high sampling rate and encoding in accordance with a linear characteristic. 2 S. and 2 C.p. f-crystals, 1 Il.

The invention relates to a method as defined umbrella term in paragraph 1 of the claims.

May be a situation in which an analog subscriber line telephone communications system is used in conjunction analog terminal telephony device and the target device data transfer, and connection termination device data to a subscriber line is made through a modem. Modem (modulator/demodulator) is a device data transfer, which is designed for digital signals, dostavlenny the crystals of electrical power, which correspond to the electric conditions analog telephone connections, and accordingly to provide the inverse transform such signals into digital signals. In this context, the modulation of the carrier signal data, and use different modulation methods.

Connected thus the target device data can represent, for example, a personal computer.

If known at the present time the transmission of data from the connected thus through the telephone network terminal devices, the so-called modem transfers data in blocks of user inputs the telephone exchange are subjected to the same treatment that speech signals, namely to limit the band of frequencies less than 4 kHz, analog-to-digital conversion and encoding in accordance with a nonlinear characteristic (a-law or-the law), so that the bit rate is reduced in accordance with the limited available bandwidth.

Data such processing imposes restrictions, particularly if have to cause transfer of large amounts of data, as in the case of dial-up connections through a pool of modems with eclogite this method of processing telephone signals and data from the terminal devices transmit data in the schema of user input, which provides the most favorable conditions especially for data transmission. This problem is solved by a method characterized by the distinguishing signs of paragraph 1 of the claims.

In accordance with the claimed method at least the data delivered from the target device data, when required in the schema of user input analog-to-digital conversion quantized with a sampling rate that exceeds the sampling rate required for telephone signals, and/or discrete values to represent the data delivered to the target device data subjected to the encoding in accordance with a linear characteristic. Such processed data received from the target device data are fed directly into the data network.

Thus, on the one hand, you can ensure that data received from the target device data not subjected to the same restrictions as the signals received from the analog terminal telephony device, which primarily relates to the reduction in bit rate due to the use of non-linear characteristics, and d communication with the required sampling frequency corresponding to the transmission of data as a result of direct transmission of data through the data network is not required to take into account any limitations on bandwidth. Both of these activities in the form of exceptions nonlinear encoding and in the form of a sampling frequency higher than provided for use in case of telephone signals, can be used separately or in combination.

Further options for the development of the invention are characterized in the dependent claims.

According to the first variant of the method corresponding to the invention, the data received from the target device data for transmission over the subscriber line to modulate a carrier signal whose frequency lies above the frequency band allocated for transmission of telephony signals. Thereby remove restrictions, which are still available for the upper boundary values of the frequency of a carrier signal set with consideration of the limitations of the bandwidth of the speech signal.

Another variant embodiment of the invention describes a scheme of user input, which is designed to give toanalogue Converter, used for both voice signals and data signals, and connected to the digital side of the signal processor, which is a digital interface with a telephone communication network, a telephone station, and on the other hand to the data network.

The invention is illustrated below by the example of execution with reference to the drawing.

The drawing shows in the volume required for the explanation of the invention, the components of the two telephone stations TC1 and TC, between which there is a channel transmission gearbox, and also shown as block data network SPD. Discusses modem communication terminal device connected to the telephone station TC1, with terminal data device connected to the telephone station TS. As these target devices data can be used personal computers PKa and PKB, respectively. Personal computers are connected respectively via modem Fashion and Modb to the analog subscriber lines Ala and ALB, respectively, through which a connection is established with the scheme of user input Sava telephone station TC1 and according to the diagram of user input Savb phone Stan the phone target device Body and accordingly the telephone terminal device of TeV their respective subscriber inputs.

The main components of the schemes of user inputs include branching scheme CPA and accordingly the scheme of branching CRP to go with a two-wire circuit in wire from the subscriber line to four-wire circuits transfer the telephone exchange, and is also included in these four-wire circuit amplifiers and analog-to-digital Converter (ADC) in a transmitting circuit and a digital-analog Converter DAC in the receiving circuit. In addition, a digital signal processor DSP that receives the output signals of the analog-to-digital Converter (ADC) and which delivers the digital signals to analog Converter DAC. From telephone station digital signal processor DSP is connected on the one hand with the communications network SSA (respectively PRS), the corresponding telephone station, and on the other hand it forms the interface to the data network, SPD, for example, network asynchronous transfer mode (ATM) network or networks Enternet.

In the schema of user inputs includes, in addition, the controller KTR, which controls the digital signal processor DSP and provides information signaling for establishing telephone connections, in connection with which he communicates with the corresponding controller is unity alarm.

The channel transfer gearbox between the two telephone stations TC1 and TC through wiring diagrams Spa and accordingly SPb connected to the communication networks of these exchanges.

When connecting the target device data PKa to the target device data FCB the data generated by these target devices transfer data in the modem Fashion and, therefore, the modem Modb converted to analog signals and modulate a carrier oscillation to ensure transmission over subscriber line Ala. In the existing dial-up connection, in which the signal processing of the data in the devices telephone station and the transmission channel was carried out similarly to the voice information during a telephone voice call, mentioned carrier frequency, taking into account the limitations of the bandwidth for transmission of voice information value of 3 kHz, is set to, for example, 2,6 kHz. In the schema of user input Sava these data are transmitted in the form of analog signals are subjected to analog-to-digital conversion in the analog-to-digital Converter (ADC). The sampling rate of the existing analog-to-digital converters is 8 televisores per second (kvib/s), whereby after compression in accordance with neligan arrivalsa standard bit rate of 64 kbps for dial-up connection.

In accordance with the invention, when the analog-to-digital conversion sampling analog signals corresponding to the data received from the target device, a data transfer is performed with the sampling frequency, which lies significantly above the sampling frequency for voice information, for example, with a frequency of 64 kvib/s Coding of digital signals is performed in accordance with a linear characteristic, for example, using a 16-bit representation. These digital signals via the digital signal processor are transmitted to the data transmission network, SPD, in which any of the above conditions can be transmitted to a data rate of about 1 Mbit/s

The above steps for processing data received from the terminal device data, namely discretization with high sampling frequency and an exception compression envisaged for the information of speech signals, can be used separately, when sufficient lower data transfer rate.

Since in practice, the analog-to-digital conversion of voice information signals is carried out using the same analog-to-digital Converter ADC, the corresponding corresponded to unchanged complying with international standards the terms of the transmission of telephony signals, i.e. with a reduction of up to 8000 samples sample rate per second and compressed in accordance with a nonlinear characteristic to obtain a code representation using 8-bit code words. On the opposite side, i.e. in the schema of user input Savb and modem Modb, implemented appropriate procedures.

For analog-to-digital conversions can be applied to any principles of conversion, if they provide a higher sampling rate as values that are multiples of the value of 8000 samples per second, and the representation of digital signals in the form of code words with a number of bits greater than 8. Particularly suitable in this connection is the so-called "Sigma/Delta Converter, which operates with a very high sampling frequency (10 MHz), but uses only one or two bits to represent a digital signal. Using a digital signal processor in this case is the subsequent decimation (decimate) to obtain a lower sampling rate and is achieved by changing the code view, for example, to obtain the 16-bit code words.

If on the opposite side of the modem connection uses traditional hardware, it will be as before, the digital signal processor DSP will process the received analog-to-digital Converter signals respectively to the low value of the band width of the transmission and the bit rate, as a result, in any case, the benefits provided by the new analog-to-digital Converter will not be used.

Claims

1. The method of signal processing telephone communication, developed end-to-end telephony device and the data generated target device data in the schema of user input, digital phone systems, used at least partially for data transmission, and with the scheme of user input terminating telephony device is connected through the analog subscriber line, and the target data device connected via a modem connected to the mentioned analog subscriber line, wherein at least the data delivered from the target device for data transfer with the required analog-to-digital conversion, is subjected to sampling by the sampling frequency, which exceeds the sampling rate required for information phone will signaturegem encoding in accordance with a linear characteristic and thus treated data, received from the target device data is fed directly to the data network.

2. The method according to p. 1, characterized in that the data delivered from the target device data for transmission on the subscriber line are modulated carrier signal whose frequency lies above the frequency band available for transmission of signals to the telephone.

3. Scheme subscriber input digital phone system, used at least partially for data transmission, and the schema of user input is designed for signal processing telephone communication, developed end-to-end telephony device and the data generated target device data with the schema of user input terminating telephony device is connected through the analog subscriber line, and the target data device connected via a modem connected to the mentioned analog subscriber line, characterized in that it contains an analog-to-digital Converter with a high sampling rate than the sampling rate required for telephone signals, which serves as the telephony signals issued by the governmental, and a digital signal processor, which is issued for analog-to-digital Converter digital signals, at least when they are telephony signals, carries out the reduction of the transmission rate to the specified bit rate and puts the signals representing signals of telephone communications, coding in accordance with a nonlinear characteristic.

4. Diagram of user input on p. 3, characterized in that the digital signal processor produces a digital interface, through which digital signals issued by the digital processor signals representing signals of the target device data passed in the data network and respectively coming from this network data signals intended for a target device data is passed to a digital signal processor.

 

Same patents:

The invention relates to a method for installation of a telephone connection via a switching node of the PSTN with the target devices that are used by many subscribers

The invention relates to techniques for covert monitoring of calls passing through the automatic call distribution

The invention relates to the interconnection of communications networks, including the telephone means to the Internet

The invention relates to communication systems, for example, via the Internet

The invention relates to a method of testing a voice path in communication systems, and speech paths include the expansion and compression of the speech signal, and to apparatus for implementing the method

The invention relates to a system for interfacing institutional automatic telephone exchange (PBX) network operating in the asynchronous transfer mode (BDA)

The invention relates to a user segment digital network integrated services

The invention relates to a method callback for communication respectively with the agreed devices, in particular to method a callback via the network backbone

The invention relates to techniques for combating commercial and industrial espionage carried out due to the effect of parametric micromodulation in electronic equipment and occurrence dependence of leakage of information over communication lines

The invention relates to techniques for telecommunication and can be used for telephone operational and technological communication between subscribers of the fixed network and the subscribers in mobile objects

The invention relates to techniques for covert monitoring of calls passing through the automatic call distribution

The invention relates to combining the Internet with the phone systems

The invention relates to communication technology, in particular to the transmission of information over switched telephone lines

The invention relates to systems for the transmission and reception by the subscriber alarming information

The invention relates to a device receiving a clock signal to control the network synchronization PBX

The invention relates to a communication system, particularly a telephone connection, in which the subscriber line is connected to the automatic telephone station

The invention relates to telephony, and can be used to provide subscribers with additional services for the control and management of automated objects

The invention relates to techniques for telecommunication and may find application in systems of control and management of automated objects connected to the telephone network

The invention relates to communication and can be used in adaptive synchronous and asynchronous communication systems
Up!