Device for transmission of information

 

(57) Abstract:

The invention relates to techniques for wire broadcasting and can be used to organize channels of digital transmission of information in the existing wire broadcasting networks. A device that contains two channels, each of which consists of an information source connected to a linear amplifier, the output of the linear amplifier of the first channel is connected via a wired communication line power wire broadcasting, the output of the linear amplifier of the second channel via a wired communication line connected to the transmitter input, the output of which the output of the amplifier wired broadcasting connected to the inputs of the summing device. To increase the number of channels of the transmission device includes the additional information source connected to the input of another transmitter that is connected to the input of the linear amplifier circuit of the second channel, the matching device pins connected to the wired communication lines of the second and first transmission channel, the receiver, the input of which is connected to the output of the summing device and the output to a personal computer. 3 C.p. f-crystals, 5 Il.

The invention relates to the field of data transmission, and more particularly to APPV existing wire broadcasting networks, for example, urban and rural radio.

Currently, there is a wire broadcasting network, built on commercially available equipment d.118.064. On the wire broadcasting network are passed to the three programs in one sound range and two in the high-frequency carrier frequency 78 and 120 kHz. The broadcast program of the existing system wired three-program broadcast take the following frequency bands: I program 50-10000 Hz, II programme 72-84 kHz, III program 114-126 kHz. Unallocated remain bandwidth: 23-72, 84-114 kHz and frequencies above 126 kHz. The higher frequency in the three-program system wired broadcasting is not used, so as not to create interference in the broadcast range.

This network, a simplified block diagram of which is attached, in each channel is an information source, is connected through a switching unit to the linear amplifier, the output of the linear amplifier of the first channel via a wired communication line, and the other switching unit is connected to the input of the amplifier wire broadcasting, and the output of the linear amplifier of the second channel via a wired communication line and the second switching unit connected to the transmitter input, the output of which the output of the amplifier wired broadcast podcasted for transmission over a wired communication lines ranges from 50 to 150 kHz. The upper limit of the frequency band limited by the fact that frequencies above 150 kHz relate to the long-wavelength range and are designed to operate radio stations, and the lower limit is limited by the fact that the bandwidth is determined by the characteristics of the transformers.

The disadvantage of the described system, information transmission is that it has a small number of channels.

The closest in technical essence to the present invention is a device in which this system is a complex system, tentatively called TPR-SRM (wired three-program multi-program broadcasting of cable broadcasting). In this system from transmitters operating in the range of 150-400 kHz and installed on the PBX, via telephone lines to homes (consumers) will be transmitted to several (3-5) broadcast programs.

This system in each channel contains a transmitter, the outputs of which are connected with the unit of addition, the outputs of block addition, through matching device connected to the corresponding receivers of information.

The described device allows to increase the number of channels of cable broadcasting, but require significant additional costs associated with the conversion of the number of transmission channels of information at minimal cost, that is achieved by use part of the bandwidth of the low-frequency amplifier that is not used in the system of sound broadcasting. It uses frequency 17 and 19 kHz, while in the systems of sound radio uses frequencies from 50 Hz to 10 kHz.

The actual bandwidth used commercially amplifiers wired broadcasting OLA-5, OLA-15 extends to 20 kHz. The disadvantage of these amplifiers is a significant gain flatness in the band from 10 to 20 kHz. The elimination of the influence of non-uniformity of the gain in the desired frequency band is carried out by application of the method of frequency telegraphy with amplification and subsequent restriction in the intermediate points.

The proposed device for transmitting digital information contains two channels, each of which consists of an information source, is connected to a linear amplifier, the output of the linear amplifier of the first channel via a wired communication line is connected to the input of the amplifier wire broadcasting, the output of the linear amplifier of the second channel via a wired communication line connected to the transmitter input, the output of which the output of the amplifier wired broadcasting connected with it introduced an additional channel, includes an information source connected to the transmitter input connected to the input of the linear amplifier circuit of the second channel, the matching device pins connected to the wired communication lines of the second and first transmission channel, the receiver, the input of which is connected to the output of the summing device, and output to a personal computer.

This solution allows to increase the number of communication channels at a minimal hardware cost, there is no need to change, and loss to stop and reconstruction of equipment.

In Fig. 1 shows a structural diagram of the device of Fig. 2 specific technical implementation of the transmitter of Fig.3, device coordination, and Fig.4 is the same, the receiver of Fig.5 is a structural diagram of the known device.

The proposed device transmitting digital information consists of first and second channels, one of which city broadcasting network is the transmission of the first program, and another second (or third) program the radio. Each of these channels contains the information source 1, the output of which is connected with the corresponding linear Huila wire broadcasting 4, which can be used, for example, commercially available amplifiers OLA-5, OLA-15. The output of the linear amplifier 2 of the second channel via a wired communication line 5 is connected to the input of the transmitter 6, the output of which the output of the amplifier wired broadcasting 4 are connected to corresponding inputs of a summing device 7, the output of which is connected to the receiver 8 is connected, for example, to a personal computer 9. In addition, the proposed device includes a third channel, for transmitting digital information consisting of the information source 10, the output connected to the transmitter 11,the findings of which are connected to the input circuit of the linear amplifier 2 of the second channel which is used for transmission of the second (or third) programs broadcasting from the device approval 12, an input connected to the output of the linear amplifier 2 of the second channel, another output device approval 12 is connected to the wire telephone line 3 of the first channel between the output of the linear amplifier 2 and the input of the amplifier wired broadcasting 4.

The transmitter 11 (Fig. 2) contains a matching transformer 13, the output resistance Ro> 600 Ohms, one terminal of the secondary winding of the transformer poele 16, the output of the lowpass filter 14 via the amplifier 17 is connected to the rectifier 18, the output of which is connected to the first input of the attenuator 19, an output connected to the input of bandpass filter 20, the output of which is connected to the input of the amplifier 16, the second input of the attenuator 19 through the switch 21 is connected to the outputs of the frequency dividers 22,23, respectively, the inputs of which is connected to the output of the generator 24, the frequency dividers 22,23 have ratios1and K2respectively.

Device approval 12 (Fig.3) contains a matching transformer 25, the primary winding of which is connected to the wire telephone line 3 of the first channel, the secondary winding of the transformer 25 single output connected to a common bus, and the other output to the input of low pass filter 26, and through a capacitor 27 to the output of the amplifier 28, the output of the filter 26 through the amplifier 29 is connected to the input of the rectifier 30, the output of which is connected to the first input of the attenuator 31, the output of which through the band-pass filter 32 is connected to the input of the amplifier 28, the second input of the attenuator 31 is connected to the output of the amplitude discriminator 33, input connected to the output of the bandpass filter 34, an input connected to one terminal of the secondary winding of the matching Proc. of the ligature 5 second channel broadcasting, transmitting a second (or third) transfer program.

The receiver 8 (Fig.4) contains a matching transformer 36, the primary winding of which is connected to the output circuit of a summing device 7, and the secondary winding of one output through a band-pass filter 37 is connected to an amplitude discriminator 38, the output of which a frequency detector 39 is connected to one of the outputs of the comparator 40, the other input connected to the reference voltage, and output to the computer user (personal computer).

The proposed device operates as follows. Information signal, such as stock market news, advertising, information source 10 in digital form, for example in the standard RS - 232S, received at the input of the transmitter 11, which is the input of the switch 21 (Fig.2). On the other inputs of the switch 21 the signals from generator 24, which is pre-divided by the frequency dividers 22,23, with ratios respectively TO1=19, K2= 17 or multiples of them to obtain output signals with frequencies of 17 and 19 kHz.

The generator 24 generates pulses with a frequency of 327 kHz or integer times. The negative value of the voltage source informatsionno shall provide the division ratio K1. Information signal from the output of the switch 21 is supplied to the corresponding input of the attenuator 19, to the control input of which receives the signal from the second channel through which is passed the program of radio city broadcasting network. This signal is pre-converted by the filter 14, an amplifier 17 and a rectifier 18. The level of the output signal of the attenuator 19 depends on the level of a signal from the information source 1. The level of the signal transmitted from the information source 10, far below the level of the main signal, so additional signal does not affect the characteristics of the main signal. The output signal from the attenuator 19 through the band-pass filter 20, the amplifier 16, the capacitor 15 is applied to the secondary winding of the transformer 13 and through the primary winding is transferred to the input of the linear amplifier 2 of the second channel, the output of which feeds the wire communication line 5 and through it to the inputs of the transmitter 6 and device approval 12. The signal transmitted via the communication line 5 through the transformer 35 (Fig.3), is fed to the bandpass filter 34, then through the amplitude discriminator 33 is fed to a corresponding input of the attenuator 34, the other input to the life of frequencies 26, the amplifier 29 and the rectifier 30. The signal level at the output of the controlled attenuator 34, as mentioned above, adjusts the level of the signal transmitted through the main channel, and is not more than 10% from the level of the main signal. While the quartermaster amplifiers in additional bandwidth is not standardized. Thus, at points intermediate the gain allocated additional signal, amplified, transmitted to another channel, is limited in amplitude and again adjusts the amplitude of the other channel.

The output signal from the device approval 12 via the amplifier wired broadcasting 4 is fed to the input of summing device 7, the other input of which is fed the output signal of the transmitter 6. The output signal from summing device 7 is supplied to consumers (broadcast) and through the transformer 36 to the input of the receiver 8 (Fig.4). This signal from the secondary winding of the transformer 36 is supplied to band-pass filter 37, the amplitude discriminator 38 and a frequency detector 39, the output of which is input to comparator 40, the other input of which a reference voltage. From the output of the comparator 4 signal, for example in the format of RS-232S, is fed to a personal computer consumer due to the use of unused bandwidth.

1. Device for transmitting information containing the first and second channels, each of which contains a source of information, the output is connected to a linear amplifier, the output of the linear amplifier of the first channel via a wired communication line is connected to the input of the amplifier wire broadcasting, the output of the linear amplifier of the second channel through the other wire communication line connected to the transmitter input, the output of which the output of the amplifier wired broadcasting connected to corresponding inputs of a summing device, the output is connected to the consumer, characterized in that it further comprises an information source connected to the input of the second transmitter, the output circuit of which is connected to the input of a linear amplifier of the second channel, device approval, the entrance of which is through a wired communication line of the second channel is connected to the output of the linear amplifier of the second channel, and the output circuit via a wired communication line of the first channel is connected to the output of the linear amplifier of the first channel and to the input of the amplifier is wired to the first channel, the receiver, the input connected to the output of the summing device, and an output connected to a personal computer.

2. The device according to p. 1, ExC the s to the input of a linear amplifier of the second channel, and the secondary winding of one output connected to a common bus, and the other output to the input of the lowpass filter and through a capacitor to the output of the first amplifier, the output of low pass filter via a second amplifier connected to the rectifier output is connected to the first input of the attenuator, the output of which through the band-pass filter connected to the input of the first amplifier, the second input of the attenuator through a switch connected to the source of information and with the outputs of the first and second frequency dividers whose inputs are connected to the generator output.

3. The device under item 1, characterized in that the device matching includes matching transformer, the primary winding of which is connected to a wired communication line of the first channel, one terminal of the secondary winding is connected to a shared bus, and the other output connected to the input of the lowpass filter, and through a capacitor to the output of the first amplifier, the output of low pass filter via a second amplifier connected to the input of the rectifier, the output of which is connected to the first input of the attenuator, the output of which through the band-pass filter connected to the input of the first amplifier, the second input of the attenuator is connected to the output of the amplitude discriminator, the input is connected to wyjocugk output connected to a common bus, and the primary winding of this transformer is connected to a wired communication line of the second channel.

4. The device under item 1, characterized in that the receiver contains a transformer, the primary winding of which is connected to the output of the summing device, one terminal of the secondary winding is connected to the shared bus, and the other output is connected to the input of a bandpass filter, the output of which through the amplitude discriminator connected to the input of frequency detector, the output of which is connected to the first comparator input, a second input connected to the reference voltage, and output to a personal computer.

 

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