RU104804U1 - CHANNEL FORMING DEVICE - Google Patents

Abstract

 1. A channel-forming device for generating, transmitting and receiving sound signals of room acoustics via a digital IP communication channel, characterized in that it contains a channel-forming converter including a power supply unit connected at the input to the power supply unit of the IP telephone, and at the output to an amplifier current, the input of which is combined with a microphone, and the output - with the matching unit, consisting of a matching transformer, the primary winding of which is connected through the isolation capacitor to the output of the current amplifier, and the second the primary winding with one output through a resistor is connected to one of the two wires of the forward IP subchannel communication line, and the second to one of the two wires of the reverse IP subchannel communication line, and an acoustic receiver of acoustic signals, including a matching transformer, the primary winding of which with one output through the resistor is connected to one of the two wires of the direct IP subchannel communication line, and the second to one of the two wires of the reverse IP subchannel communication line, and the secondary winding is output to the amplifier of acoustic signals of sound reception Nika. ! 2. The device according to claim 1, characterized in that the power supply unit of the channel-forming converter is connected via an input line to the communication line through which power is supplied to the IP telephone from the injector. ! 3. The device according to claim 1, characterized in that the matching transformer of the matching unit of the sound receiver is configured to galvanically decouple the sound receiver from the communication line and perform the function of a high-pass filter in the input path of the sound receiver.

Description

The utility model relates to the field of telecommunications, in particular, to digital telephone communication systems and is designed to create a digital IP communication channel / designed to transport digital packets of information (voice + data), an additional analog channel for transmitting audio information.

The prior art device with a remote microphone, containing a microphone amplifier, a matching unit with a telephone line, a unit for checking the status of the telephone line and transmitting acoustic information in the audio range for analog telephone communication channels (Special radio systems. Classification of special technical equipment designed for information retrieval in the telephone line (http://www.radioscanner.ru/info).

The specified device works as follows. If the telephone is in the “off-hook” mode, then the sound signals of the room acoustics follow from the device via the telephone communication channel. Acoustic sound signals can be received along the entire route from the telephone set to the telephone exchange. If the telephone is in the “off-hook” mode or ringing signals are received on the telephone, the device goes into standby mode, that is, the acoustic signals of the acoustics do not pass into the communication line, and telephony signals follow. Everything is repeated again from the moment the telephone set enters the “off-hook” mode.

To receive sound signals of acoustics, it is enough to use an amplifier with a large input impedance. The amplifier is connected in parallel to the communication line.

In another embodiment, the acoustic acoustic signals from the microphone amplifier act on a high-frequency carrier frequency generator, which can be selected in the range from 20 kHz to 8 MHz.

Acoustic signals of high-frequency acoustics are introduced into the telephone line and transmitted through it. Modulated high-frequency signals are received by appropriate equipment, connected in parallel to the communication line throughout its length. After filtering and amplification, acoustic acoustic signals are transmitted to non-recording equipment.

Such a technical solution ensures the simultaneous transmission of telephone signals and sound signals of room acoustics via an analog telephone communication channel.

The closest analogue of the proposed utility model is a channel-forming converter (RU 93605, 04/27/2010). Using this converter, it is possible to transmit sound information about the acoustics of premises in analog form via a digital telephone communication channel. This transfer is achieved by connecting this converter to the break of one of the two wires of the telephone line of communication anywhere along its entire length from a subscriber digital telephone set to an office (office) digital telephone exchange. In this case, the analogue channel for transmitting audio signals of acoustics is formed in the subscriber digital telephone communication channel due to the conversion of direct voltage supplied through the telephone line from the office digital telephone station to the subscriber digital telephone set to ensure its functioning in a pulsating manner in accordance with the acoustic signals of the acoustics.

Voice information and data are transmitted in digital IP communication channels using pulse packets, the repetition rate of which in packets is 10 MHz, over 4-wire (2 wire pairs) communication lines. One pair for direct, and the second pair for reverse sub-channels for transmitting digital information packets.

In both subchannels, galvanic isolation of the IP telephone and the line packet switch of the IP server with communication lines using high-frequency pulse transformers was used.

In this regard, in the communication lines of the forward and reverse subchannels there is no constant voltage to power the telephone IP device.

The power supply of the IP telephone can be carried out either from the network adapter or from the splitter, to which the supply voltage is sent from the injector via a free pair of wires (15 and 16 in figure 1).

The disadvantage of all known devices, including the one chosen as the closest analogue, is that they cannot be applicable for the generation, transmission and reception of sound signals of room acoustics in analog form via a digital IP communication channel.

It is not advisable to create an additional analog audio channel by turning on the channel-forming converter in parallel or sequentially (into the gap of one of the connected wires) of the communication line in any direct or reverse IP subchannel.

Reason: high-frequency pulse transformers and filter transformers in the IP communication channel have almost zero impedance at audio frequencies of 300-3400 Hz. The actual load of the output circuit of the channel-forming converter according to patent RU 93605 with this inclusion will be the distributed resistance of the communication line, which within the office has very small values. In addition, the organization of an additional channel for transmitting audio information in IP communication channels can lead to distortions and failures of both pulses in digital packets and the packets themselves.

Conclusion: it is impossible to organize in any of the IP subchannels an additional channel for transmitting acoustic acoustic signals in analog form.

The problem to which the proposed utility model is directed is to create such a design of a channel-forming device and to find such a method of incorporating it into a digital IP communication channel that would allow for the formation of an additional channel for transmitting audio signals through the digital IP communication channel and eliminate the above-mentioned disadvantages .

The technical result achieved by the implementation of this utility model is:

- the possibility of forming, transmitting and receiving sound signals of acoustics in analog form via a digital IP communication channel,

- in the operational receipt of continuous audio information in analog form via a digital IP communication channel from microphone installation sites,

- in achieving the necessary reliability and quality of the transmission and reception of acoustic acoustic signals over a digital IP communication channel,

- in the elimination of failures and distortion of pulses in digital information packets from analogue acoustic signals transmitted via digital IP channel,

- the possibility of simultaneous transmission of digital information packets (voice + data) and sound signals of acoustics in analog form,

- in the absence of a unmasking factor,

- in relatively small overall dimensions.

The specified technical result is achieved in a channel-forming device for generating, transmitting and receiving sound signals of room acoustics via a digital IP communication channel containing a channel-forming converter including a power supply unit connected at the input to the power supply unit of the IP telephone and at the output to a current amplifier the input of which is combined with a microphone, and the output is with the matching unit, consisting of a matching transformer, the primary winding of which through the isolation capacitor is combined with the output a current amplifier, and the secondary winding through one resistor terminal is connected to one of the wires of the forward IP subchannel communication line, and the second to one of two wires of the reverse IP subchannel communication line, and an acoustic receiver of acoustic signals, including a matching transformer, the primary winding of which one output through a resistor is connected to one of the two wires of the direct IP subchannel communication line, and the second to one of the two wires of the reverse IP subchannel communication line, and the secondary winding is output to the audio signal amplifier a pickup bushes.

The matching transformer of the matching unit of the sound receiver is made with the possibility of galvanic isolation of the sound receiver with a communication line and acting as a high-pass filter in the input path of the sound receiver.

Thanks to the circuitry of individual nodes and the method of incorporating a channel-forming device into the digital IP communication channel, continuous audio information is obtained from the microphone installation points via the IP communication channel.

The selected methods for generating, transmitting and receiving acoustic acoustics via an IP communication channel enable the technical implementation of the claimed device with no unmasking factor to receive and transmit relatively large values of acoustic acoustics, which ultimately significantly improves the reliability and quality of their transmission and reception.

In addition, the technical result is achieved due to the simple circuitry of the claimed device and a small number of radio components.

The essence of the utility model is illustrated by drawings, where Fig. 1 shows a digital IP channel for transmitting information packets (voice + data) and acoustic signals; figure 2-4 - conversion of a 4-wire communication channel of the IP channel at audio frequencies 300-3400 Hz; figure 5-8 - waveforms of signals in a digital IP communication channel while transmitting digital information packets and sound signals of acoustics.

Figure 1 shows a functional diagram of a channelization device 23 for generating, transmitting and receiving acoustic acoustic signals in an IP communication channel, and also shows an option for connecting a channelization device 23 to an IP communication line.

The channelization device 23 includes a channelization converter 7, comprising a power supply unit 1 connected at the input to the IP telephone power supply unit (source), and the output to a current amplifier 2, the input of which is combined with a microphone 3, and the output with a matching unit 4 consisting of a matching transformer TP1, the primary winding W1 of which is connected to the output of current amplifier 2 through an isolation capacitor C1, and the secondary winding W2 is connected to one of two wires (9 or 10) of the communication line LS1 through one resistor R1 IP communication channel, and the second one with one of the two wires (11 or 14) of the communication line LS2 of the reverse IP communication channel, and a sound receiver 8 of acoustic signals, the matching unit 5 of which consists of a matching transformer TP2, the primary winding of which W1 with one output through resistor R2 is combined with one of the two wires (9 or 10) of the communication line LS1 of the direct IP communication subchannel, and the second with one of the two wires (11 or 14) of the communication line LS1 of the reverse IP subchannel of communication, and the secondary winding W2 is output to amplifier 6 sound signals acoustics nickname 8.

An analog acoustic sound signal transmission channel is created in the digital IP communication channel by connecting the matching node 4 of the channel-forming converter 7 of the claimed device with one output to one of the two wires (9 or 10) of the LS1 communication line of the direct IP communication subchannel, and the second one of one of the two wires (11 or 14) of the communication line LS2 of the reverse IP sub-channel of communication, as well as by connecting the matching node 5 of the sound receiver 8 of the claimed device with one output to one of the two wires (9 or 10) of the communication line LS1 of the direct IP sub-channel of communication, and the second m - with one of two wires (11 or 14) of the LS2 communication line of the reverse IP subchannel of communication.

The channelization device 23 operates as follows.

When applying power to the power source from the output of the power unit 1, the supply voltage follows the electronic circuit of the channel-forming converter 7 of the claimed device (CPA): current amplifier 2, microphone 3, matching unit 4. The acoustic signals converted by the microphone 3 into electric ones are amplified by current amplifier 2 and through the isolation capacitor C1 act on the primary winding W1 of the matching transformer TP1 matching node 4 with a bandwidth of 300-3400 Hz.

From the secondary winding W2 of transformer TP1, audio signals pass through the limiting resistor R1 on the communication line LS1 and LS2 (wires 9 and 11).

Acoustic signals of acoustics appear in the communication lines LS1 and LS2. The removal of these signals is performed using the sound receiver 8 anywhere on the LAN1 and LAN2 along their entire length from the IP telephone 20 (IPTA) to the packet switch 17 installed near the IP server.

Through the communication lines LS1 and LS2 (wires 10 and 14), sound signals follow the sound receiver 8 and act on its input path: neither the primary winding W1 of the transformer TP2 of the matching unit 5 through the limiting resistor R2. ^at

From the secondary winding W2 of the transformer TP2 matching unit 5, the sound signals are sent to the input of the amplifier 6.

The transformer TP2 of the matching unit 5 of the sound receiver 8 performs the function of not only galvanic isolation, but also a high-pass filter, that is, eliminates the need to install such a filter.

The limiting resistors R1 and R2 are necessary to exclude the influence of the output and input paths of the KOPU 7 and the sound receiver 8, respectively, on the transfer characteristics of the IP subchannels.

In linear circuits of standard equipment (Fig. 1, pos. 24): packet switches 17 and IPTA 20, high-frequency pulse transformers are used to ensure galvanic isolation with communication lines, for example, CISCO, HALO, Surecom, and other switches. In a simplified form in FIG. 1, item 24 shows the circuit solutions of galvanic isolation with communication lines in standard equipment.

Due to the fact that the pulse repetition rate in the information packet is 10 MHz, the linear decoupling transformers TP3, TP4, TP5, TP6 and filter transformers F1, F2, F3, F4 (Fig. 1, item 24) are high-frequency pulse transformers. At sound frequencies of 300-3400 Hz with acceptable simplifications, transformers TP3, TP4, TP5, TP6 and filter transformers F1, F2, F3, F4 (Fig.2) have an input impedance close to zero. In practice, their windings located in the circuits LS1 and LS2 can be considered short-circuited at sound frequencies (Fig. 3).

Result: 4-wire communication channel of the IP channel is converted to 2-wire communication at audio frequencies, that is, each 2-wire communication line LS1 (direct IP subchannel) and LS2 (reverse IP subchannel) is converted into a single-wire (Fig. 4) .

Consequence: for transmitting and receiving audio signals of acoustics via communication lines LS1 and LS2 of a digital IP channel, any of the given combinations of wires can be used: 9-11, 9-14, 10-11, 10-14 (Fig. 4). For example, when transmitting acoustic signals through wires 9-11, these signals can be removed from wires 9-11, 9-14, 10-11, 10-14.

During the simultaneous transportation of digital IP packets and acoustic acoustic signals, as can be seen from the oscillograms in Figs. 5-8, the latter in no way distort the amplitude-frequency characteristics of the pulses and do not lead to their failures in the information packets 21 in direct (Figs. 5, 7 ) and the reverse (6, 8) IP subchannels. In this case, acoustic signals 22 of acoustics with an amplitude of 5-6 V can be transmitted (Fig. 5 and 6 U _max ≈6 V, Fig. 7 and 8 U _max ≤2 V).

Oscillograms show that the digital IP channel for transmitting information packets and the additional analog channel for transmitting audio signals of acoustics formed in it do not undergo mutual influence during simultaneous operation.

When you connect IPTA to the mains via the adapter, the controllers can be installed inside the telephone. The same result can be achieved by supplying IPTA from a splitter 19, the supply voltage to which comes through a free pair of wires 15 and 16 (Fig. 1) of the communication line from injector 18. At the same time, feeding the control unit via the same pair of wires 15 and 16 from the injector 18, it can be installed anywhere on the communication line along its entire length from IPTA to packet switch 17 (FIG. 1).

The proposed utility model of a channel-forming device was tested and applied in an IP communication channel based on a Nec2400jPx digital telephone exchange. The channel-forming device is interfaced with the modern domestic complex of computer sound recording “Phobos” of the “Vokord” company.

Claims (3)

1. A channel-forming device for generating, transmitting and receiving sound signals of room acoustics via a digital IP communication channel, characterized in that it contains a channel-forming converter including a power supply unit connected at the input to the power supply unit of the IP telephone, and at the output to an amplifier current, the input of which is combined with a microphone, and the output - with the matching unit, consisting of a matching transformer, the primary winding of which is connected through the isolation capacitor to the output of the current amplifier, and the second the primary winding with one output through a resistor is connected to one of the two wires of the forward IP subchannel communication line, and the second to one of the two wires of the reverse IP subchannel communication line, and an acoustic receiver of acoustic signals, including a matching transformer, the primary winding of which with one output through the resistor is connected to one of the two wires of the direct IP subchannel communication line, and the second to one of the two wires of the reverse IP subchannel communication line, and the secondary winding is output to the amplifier of acoustic signals of sound reception Nika. 2. The device according to claim 1, characterized in that the power supply unit of the channel-forming converter is connected via an input line to the communication line through which power is supplied to the IP telephone from the injector. 3. The device according to claim 1, characterized in that the matching transformer of the matching unit of the sound receiver is configured to galvanically decouple the sound receiver from the communication line and perform the function of a high-pass filter in the input path of the sound receiver.