The method of formation and transmission channel, including stereo, signals, sound, broadcasting, data and control commands in networks of broadcasting and cablecasting organizations (options), the signal transmission system multichannel audio, broadcasting, data and control commands in networks of broadcasting and cablecasting organizations


H04H5 -

 

(57) Abstract:

The invention relates to a method of transmitting audio signals, radio broadcasting, data transmission and control commands in networks of broadcasting and cablecasting organizations. The technical result of the invention is a method and system sound for broadcasting and cablecasting organizations with the ability to transmit high quality audio of TV programs on the system CG SECAM existing radio channels, together with the signals of computer data or signal transfer and radio signals. The difference of the claimed method in that the coding of audio signals is performed in the MUSICAM system, for multiplexing the encoded signals using the selected transmission format to protect the package from digital errors introduced interleaving data, noise-immune digital stream svyazannyh modulate the 4-way phase shift keying of the carrier. 3 S. p. f-crystals, 2 Il.

The invention relates to the field of digital encoding and data transmission for digital channels sound of television or radio broadcasts and digital channels for the exchange of information between databases given the signals of television programs, broadcast and cable networks for television broadcast.

The subject of the work is to establish a method for simultaneous transmission of additional digital data stream on the existing radio broadcasting and cable television broadcasting television programs according to the standards of radiation CT SECAM - D, K and L (hereinafter CT SECAM) with the organization, first, dual channel, including stereo sound system for CT or SECAM signals broadcasting and, secondly, the system data and control commands for the exchange of information between databases, servers, and personal computers.

In acting on the territory of the RF system CT SECAM mono audio signal is transmitted on a separate carrier by frequency modulation. To extend the functionality of broadcast TV is possible, firstly, due to the transmission of signals stereo support and, secondly, data, and control commands for multimedia systems with the order (for example, telephone network) viewer additional services and information on-demand.

In previous decades has been the development and testing of several systems CTE is only indicators. Digital system NICAM, designed for system DH FELL [1,2] and adopted for the prototype, useful model, not combined with the CT system SECAM, having a frequency of the image signal 6 MHz, no significant reduction of the latter, which significantly reduces both luminance and color clarity. Thus, the problem is still not resolved. This invention is directed to solving this problem.

Technical implementation of digital system sound for broadcasting and cablecasting organizations will provide an opportunity for reception by the General public high-quality stereo digital audio (SCSS) TV programs in the system CG SECAM existing radio channels.

In addition, in connection with the mass introduction of personal computers (PCs) became intensely to develop a new type of services - obtain various types of information materials, information, data for PC users. For these purposes, now is ordered through the INTERNET, as well as information received from other servers and information systems. For ordering and sending of information material used channels of the existing telephone network via modems under the following disadvantages. First of all, provides a low data rate, which when working on circuit switched telephone channels is 1.2... 9.6 kbit/sec For this reason, the transmission time of the ordered file to the PC user can be tens of minutes or more, which is considerably higher than the average employment time of the channel during a telephone conversation. Eventually, with the development of computer services to subscribers in a telephone network will be harder and harder to call each other because of the constant employment of telephone channels signals modems PC.

Technical implementation of the proposed data transmission system by radio broadcasting and cable television will significantly increase the speed of their transmission, resulting in 10...20 times to reduce the transmission time of the ordered files and reduce the burden on telephone channels.

Intensively carried out in the world working on improvements in digital compression of audio signals has led to the development of digital systems to MUSICAM which the compression efficiency of the flow svyazannyh approximately 2.8 times greater than the system NICAM. This allows the transmission of digital audio to the consumer with full vannoy carrier system CT SECAM.

The system MUSICAM hosted an international comparative tests, during which it was revealed that, compared with other digital encoding it provides better subjective sound speed digital stream 196, 128 and 96 kbit/s on one channel. It formed the basis of a single world standard for high quality, low-bandwidth encoding of broadcast signals and audio ISO/IEC 13818-3. For digital audio use the so-called level II quality at speeds on the mono channels 192 kbps (mezhduslovnyj exchange with subsequent processing), 128 kbps (distribution to transmit TV station without further processing) and 96 kbit/s for terrestrial and cable broadcasting of sound programs.

The results of studies conducted by the applicant have shown the feasibility SCSS system to MUSICAM with the speed of delivery svyazannyh end consumer 256 kbit/s per stereo pair), which means an additional supply of quality relative to the recommended standard. In this subjective perception of the stereo image is indistinguishable from the sound of the CD-ROM when playing any, including music programs. In addition, Canoga support, but as an individual, for example, bilingual sound.

It is also possible to increase the number of channels of audio in a few (4...8) times and use them to send remittances sound 4-8 languages.

This is achieved by switching coders to MUSICAM-1 and 2 using the control signals (SU-1 and SU-n) mode stereo sound mode audio support in multiple languages, or commentary channels. The speed of transmission svyazannyh for one coder to MUSICAM can be reduced from 128 kbps to 32 - 64 kbit/s

Note that the mode of transmission of these channels is the default mode for the encoder to MUSICAM and provides ISO/IEC 13818.

As a result, in the digital stream 256 kbps can be arranged 256 kbps (32...64) = 8...4 commentary channels.

There may be other use cases flow of 256 kbit/S. for Example, 196 kbit/s to use for transmission SCSS that meets the requirements of the system standard-setting for broadcasting and cable broadcasting audio programs, and 64 kbps for data and control commands to the PC users. In addition, the neo is a standard monaural soundtrack. For example, the transfer of the latest news, weather forecasts, etc. during transmission which is enough to transmit mono sound, and in the intervals, you can stop sending sound data and to use the entire digital stream 256 kbps for transmission of computer data to PC users. Note that there are other options of dynamic allocation of capacity digital stream between the audio and computer data, depending on the specific conditions of use of this system.

In Fig. 1 shows a block diagram of a system including transmitting and receiving device that implements the method of formation and transmission of audio signals, radio broadcasting, data and control commands, as part of the radio spectrum TV programmes CT SECAM networks of broadcasting and cablecasting organizations.

In Fig.2 shows the radio spectrum signal formed in accordance with the claimed method.

The transmitting device includes first and second encoders to MUSICAM - 1,2, interface unit 3, the multiplexer 4, scrambler 5, channel coder 6, the modulator 7, mixer 8, the local oscillator 9, the power amplifier 10, the synchronization unit of the transmitting part 11; at the receiving side - usilitel 17, descrambler 18, the demultiplexer 19, the first and second decoders, MUSICAM - 20, 21, the connection unit 22, the synchronization unit receiving part 23.

Mode selection: transmit svyazannyh or computer data, or joint transmission of audio and computer data with different ratios of the transmission video and svyazannyh by submitting to the control input 5 (WU) multiplexer corresponding commands from the external control device, such as remote switching or computer control of the complex.

Initially, consider the formation of a data channel, including stereo sound.

Device for digital data transmission as part of the radio spectrum TV program system CT SECAM works as follows. Signals stereo accompaniment signals or sounds in different languages, or the signals of the broadcasting program in accordance with the selected transmission mode are fed to the inputs 1 and 2 (CS-1 and CS-2) two coders to MUSICAM. With the outputs of the two encoders Svobodnye served on two input multiplexer (MUX).

When multiplexing can be used one of the standard transmission formats Yes is ivemania; digital audio broadcasting (GIVING) for automotive, portable and fixed receivers", or the transfer format svyazannyh international standard for digital signals audio ISO/IEC 13818-3. Further consideration of the operation of the device will draw on the example of the transmission format standard ISO/IEC 13818-3.

In this case, continuous streams svyazannyh from each audio encoder is converted into transport packets of the MPEG-2 duration of 188 bytes with 4 bytes (the packet header) are used to transmit service information, comprising: a synchronization signal of the demultiplexer and the decoder MUSICAL, the identification signals of the type transmitted information. This indicates that you are currently in, for example, sending signals to the sound of television or radio signals or computer data, or other types of information, as well as the possible combinations of these modes of transmission. Using these signals also indicate the additional data. For example, States that are passing audio in stereo mode or mono mode in two languages. Similarly, when the transmission signal mode or two different radio in monophonic mode.

In the header of the packet is also transmitted service information: used speed digital streams, synchronization signals and the control receiver and other necessary signals (including, in particular, the signal identification package), which are entered into a digital stream encoders (1,2,...,n) MUSICAM and in the interface block. The remaining 184 bytes of the packet used to transmit data in the same packet data is transmitted only one kind of information. After this treatment, the digital stream from the output of the multiplexer to the input of the scrambler.

Further functional units of a digital data transmission system of figure 1 are common modes of transmission of audio and computer data, and they should come back after consideration of the mode of transmission of computer data.

The transition to the mode of transmission of computer data is carried out by passing the appropriate command (code word) to the control input 5 of the multiplexer MUX (see figure 1). When this occurs, the switching of the internal circuits of the multiplexer MUX, resulting in the output data interfaces-1 goes into the multiplexer circuit, and Svobodnye with the outputs of the encoders 1 and 2 MUSICAM disconnected from the mul is s total digital stream is formed by multiplexing svyazannyh and data outputs of the encoders 1 and 2 MUSICAM and device pairing 1.

Formed in the multiplexer digital stream svyazannyh and/or data and control signals receiver is input to the scrambler.

The scrambling is introduced to eliminate long series of "0" or "1" in the transport packets of the MPEG-2, thereby providing stable operation of the system clock of the receiving device. However, in order not to violate the demodulator cyclic synchronization, the start of the group of transport streams MPEG-2 scrambled not exposed.

Digital stream svyazannyh from the output of the scrambler is fed to the input of the channel encoder. The purpose of channel coding is to increase the noise immunity of digital system sound and the coordination of the parameters of the digital stream svyazannyh with energy and physical characteristics of the terrestrial and cable TV channels broadcast. This digital stream svyazannyh subjected to two-stage noiseproof coding. In the first stage is error-correction coding code reed-Solomon for protection against single digit errors in the second stage interleaving svyazannyh and convolutional error correcting coding to protect against packet cifrovaya MPEG-2 and includes a group of 8 transport packets of 188 bytes each. For the introduction of a frame synchronization signal in the first transport packet cycle is the inversion signal of the start singlegroup package. The remaining seven transport packages cycle starting singlegroup not inverted.

Error-correction coding of the transport packets of the MPEG-2 is performed together with the starting synchrogram packages and code is a reed-Solomon (204. 188. 8) that allows you to adjust the 8 packets of digital errors with a size of 1 byte. After this coding duration of the transport service increases from 188 to 204 bytes.

To protect against packet of digital errors larger than 1 byte is entered interleaving data. With this goal is to swap two adjacent bytes of the transport packet to a depth of interleave 12 bytes. However, in order not to violate in the receiver cyclic sync start singlegroup in transport packages to the alternation is not exposed and remain in their temporary positions.

To further reduce the coefficient of digital errors can be introduced into the second phase of kadosawa. When this transport packets after the interleave data are error-correcting convolutional coding of cografiya receiver is fed to the input of the phase modulator, which is four-phase shift keying of the carrier.

The modulated digital carrier signal is supplied to the first input of the mixer, the second input of which the signal from a local oscillator. In the mixer is the transfer of radio spectrum carrier at the desired frequency radio broadcasting or cable network TV broadcast.

With the mixer output signal is fed to the input of the power amplifier, which is the reinforcement signal to the desired level. From the output of the power amplifier a signal arrives or to the transmitting antenna of the telecentre in the case of broadcasting or cable head-end station television for transmission on a cable network.

Collaboration functional blocks transmitting device requires synchronization signals and control. These signals are generated in synchronization unit (see Fig. 1) and are distributed according to the functional blocks.

At the receiving side of the radio signal from the receiving antenna in the case of TV broadcasting or cable television network using a cable broadcasting is fed to the input of the amplifier high frequency (UHF), which is the gain of the signal to the desired C is full-frequency output from the amplifier is fed to a phase demodulator, which is the demodulation signal with quadruple phase shift keying. As a result, the output of the demodulator appears noiseless flow svyazannyh, data and control signals that are fed to the input of the channel decoder.

In the channel decoder is a two-step error-correction decoding of the received digital stream to eliminate batch and single digit errors. In the first stage is error-correcting decoding of the convolutional code and restore the original byte order svyazannyh. The result of this treatment significantly reduced the total number of digital errors and reduced to one byte length packets of digital errors. The final digital correction of errors produced in the second degree of the channel decoder, which produces robust decoding of reed-Solomon code, resulting in a corrected single bit and byte of digital errors. After the correction of the digital error signal from the output of the channel encoder is input to descrambler, which restores the original bit order of the data. Digital stream from the output of descrambler comes on I is tiravanija data. For example, in the case of stereo audio Svobodnye at the output of the demultiplexer are divided into two digital stream, the first of which contains Svobodnye of the first channel audio and the second digital stream - Svobodnye second channel audio.

Svobodnye first and second channels of audio from two outputs of the demultiplexer are served respectively by the first and second MUSICAM decoder.

In MUSICAM decoder conversion is performed svyazannyh in analog audio signal that arrives at the outputs of the decoders 1K and 2K.

In the case of stereo and audio support two analog audio signal from outputs of 1K and 2K MUSICAM decoder at the same time served on acoustic stereo receiver. In the case of bilingual sound telereal selects one of the channels sound for the desired language and the selected audio signal (output 1K or 2K) is input to the speaker.

For example, when broadcasting of Russian TV programs on the territory of Ukraine one channel audio SL - Russian.

In the case of signal transmission of radio programs (one stereo or two mono) signal can be used by viewers in the mode or acoustic playback or recording on tape, especially if the radio for these purposes will prepare specially selected music loops transmission. Of particular interest this mode is for the broadcasting operators broadcasting and cable broadcasting networks. In this case, the receiving device are installed on radio stations sound broadcasting and on the head cable television stations that produce the retransmission of the signals received by the broadcasting programs. In this case, the existing radio broadcasting and cable TV broadcasting is additionally used for the primary distribution of radio programs.

The advantage of such a method of distribution of radio programs is that does not require the allocation of radio frequencies for new radio channels and is used for operating the equipment, which significantly reduces the economic costs of constructing such networks is the primary distribution of radio programs.

In case the core switches to internal circuits, resulting received data begin to flow to the input impedance of the device 2, with which they arrive at the entrance of a personal computer, server, or other similar devices.

At the first stage of the introduction of digital stereo and bilingual audio examined the receiving device can be produced in the form of a user terminal, connected to a standard TV.

Further, the corresponding block will be built by the manufacturers of TV sets directly in their construction.

The main issue arising from the creation of a digital system sound system for CT SECAM, lies in the choice of the frequency interval in the radio spectrum radiation CT system SECAM to accommodate radioassay digital signal. This completely free of the frequency interval in the radio spectrum radiation CT system SECAM no. So you have to find a compromise solution, in which transient interference from the digital radioassay were not visible on the TV screen, and transient interference from radiospectrograph components of the TV signal did not create audible acoustic noise in digital audio channels sopravvissuto modulated radioassay current channel sound.

The possibility of reaching such a compromise was not obvious and required conduct experimental studies to answer this question.

It is clear that the narrowing of the lateral bands of radioassay digital signal facilitates the achievement of the specified compromise. In this regard, the coding system to MUSICAM has a significant advantage over the system NICAM 728, because in the system MUSICAM transmission rate svyazannyh and accordingly the width of the spectrum of radioassay digital signal is obtained 3 times less than in the system NICAM 728. In addition, to improve compatibility in the system (as in NICAM 728) spectrum width of the lateral strips of radioassay digital signal is reduced by half due to the application for transfer svyazannyh 4-position phase manipulation. In the width of the radio spectrum in a digital transmission channel sound does not exceed 250 kHz level - 40 dB from the maximum value.

This has put the carrying digital audio signals in the frequency interval between the upper side of the carrier image signal and the lower side frequency modulated carrier standard channel sound is="ptx2">

As a result of research and development created the current layout of the main components of the system encoder, modulator, demodulator and decoder signals SCSS. Conducted necessary tests proved the feasibility of the system,

1. The method of formation and transmission channel, including stereo, signals, sound, broadcasting, data and control commands in networks of broadcasting and cablecasting organizations to implement the transmission of digital audio to the consumer with full preservation of the quality of the video images together with sound on a frequency modulated carrier SECAM system, in which form the signal sounds, including a stereo encode the generated signals, multiplexers them with the transmitted data signals and control signals and transmit over the radio channel at the receiving side receive a transmitted signal, perform demultiplexing emitting two coded signals, audio and data signal, decode, decoded audio signals fed to the stereo receiver, characterized in that gnali commands, the control signal, multiplexer digitally coded signals in accordance with the selected data transmission formats, perform the scrambling multiplexed signal by adding modulo two pseudo-random sequence (SRP) from the generator of the SRP with the stream of digital signals from the output of the multiplexer, after scrambling perform a two-step error-correction coding scrambled signal, in a first stage to produce error-correction coding code reed-Solomon for protection against single digit errors in the second stage interleaving svyazannyh and convolutional error correcting coding to protect against packet of digital errors, perform the four-phase shift keying noiseless received digital stream signal audio signal data, signal command, control signal, while the carrier of the digital audio signal is in the frequency interval between the upper side of the carrier image signal and the lower side frequency modulated carrier standard channel audio, carried out in a mixer transfer of radio spectrum the carrier promodule who live in the power amplifier and transmit broadcast or cable networks, at the receiver side the signal is received at the input of the amplifier high frequency, carried out in a mixer spectrum shift of the received radio signal to an intermediate frequency receiving device to amplify the intermediate frequency amplifier, perform frequency selection to the selection signal of the selected channel and radio channel selection can be done by the viewer, perform phase demodulation with four-phase shift keying signal of the selected channel, perform error-correcting digital decoding a received digital stream on a channel decoder, and restoring the original data sequence, perform diskriminirovaniya signal of the channel decoder, perform demultiplexing digital stream to the demultiplexer, in which in accordance with the control signal turns on the selected mode demux data, perform the decoding demultiplexing signals on the first and second decoders to MUSICAM, the decoded audio signals serves on acoustic stereo receiver.

2. The method of formation and transmission of multichannel audio signals saprovore digital audio to the consumer with full preservation of the quality of the video images, together with sound on a frequency modulated carrier SECAM system, in which form the signal sounds, including a stereo encode the generated signals, multiplexers them with the transmitted data signals and control signals and transmit over the radio channel at the receiving side receive a transmitted signal, perform demultiplexing emitting two coded signals, audio and data signal, decode, decoded audio signals fed to the stereo receiver, characterized in that carry digital encoding of n signals sound system to MUSICAM, together with the n audio signals, transmit data signals, the signal commands the control signal in various combinations, multiplexers digitally coded signals in accordance with generally accepted formats data transfer is performed by scrambling the multiplexed signal by adding modulo two pseudo-random sequence (SRP) from the generator of the SRP with the stream of digital signals from the output of the multiplexer, after scrambling perform dvuhtokovoe coding code reed-Solomon for protection against single digit errors, in the second stage interleaving svyazannyh and convolutional error correcting coding to protect against packet of digital errors, perform the four-phase shift keying noiseless received digital stream signal, audio signal, data signal commands, control signal, while the carrier of the digital audio signal is in the frequency interval between the upper side of the carrier image signal and the lower side frequency modulated carrier standard channel audio, carried out in a mixer transfer of radio spectrum modulated carrier signal in the selected frequency channel broadcasting or cable network television broadcasting, increase in power amplifier and transmit broadcast or cable networks, at the receiver side the signal is received at the input of the amplifier high frequency, carried out in a mixer spectrum shift of the received radio signal to an intermediate frequency receiving device to amplify the intermediate frequency amplifier, make final frequency selection to the selection signal of the selected channel and radio channel selection can be done by the viewer,and, perform noise-tolerant digital decoding a received digital stream on a channel decoder, and restoring the original data sequence, perform decemberadio signal of the channel decoder, perform demultiplexing digital stream to the demultiplexer, in which in accordance with the control signal turns on the selected mode demux data, perform the decoding demultiplexing signals on the n decoders to MUSICAM, the decoded multi-channel signals sound and their translations, including radio signals, serves on the speaker system to the receiver.

3. The signal transmission system multichannel audio, broadcasting, data and control commands in networks of broadcasting and cablecasting organizations to implement the transmission of digital audio to the consumer with full preservation of the quality of the video images together with sound on a frequency modulated carrier system SECAM, containing on the transmission side n encoders, the inputs of which are the inputs of the n audio signals, and the outputs are connected to n is allowing input of the first mixer connected to the output of the first local oscillator, and at the receiving side is connected in series amplifier high frequency, the second mixer, the intermediate frequency amplifier, the demodulator, to the control input of the second mixer connected to the output of the local oscillator, the demultiplexer, the first and second outputs of which are connected to the inputs of the first and second decoder, wherein the n encoders are encoders to MUSICAM, n decoders decoders are MUSICAL, on the transmission side introduced the first connection unit, the inputs of which are inputs data and commands, and the bus outputs of which are connected to the third input of the multiplexer, and the inputs are the input data signal and signal commands, the output of the multiplexer is connected to the input of the scrambler, the output of which is connected to the input of the channel encoder, the output of which is connected to the input of the modulator, made in the form of the phase modulator, performing four-phase shift keying of the carrier, the output of the phase modulator connected to the first input of the first mixer, the first synchronization unit, the output signals of which are connected to the inputs of the synchronization of all units of the transmitting side, the receiving side entered the channel decoder, descrambler, the second connection unit, whose input is connected to int with the amplifier output intermediate frequency, the output of the phase demodulator is connected to the input of the channel decoder, the output of which is connected to the input of descrambler, the output of which is connected to the input of the demultiplexer, the second synchronization unit, the outputs of which are connected to the inputs synchronization of all units receiving part.

 

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FIELD: methods and devices for processing composite audio broadcast signal.

SUBSTANCE: proposed method includes following procedures: analog-modulated part of audio broadcast signal is separated from digital-modulated part of audio broadcast signal; data from analog component of broadcast signal is separated from its digital component to produce mixed output audio signal. Method is also proposed for transferring composite audio broadcast signal that has analog part and digital part to suppress irregular interruptions in reception of mentioned audio broadcast signal by adding modem frames with analog part of broadcast signal which incorporate audio frames presenting digital part of audio broadcast signal.

EFFECT: provision for suppressing irregular interruptions in reception of audio broadcast signal.

25 cl, 4 dwg

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