JPH05122176A - Digital audio-signal transmission method in broadcasting network - Google Patents

Abstract

PURPOSE: To provide a simple method that sends a digital audio signal to a master station of various broadcast networks from a recorder studio and its system. CONSTITUTION: Audio monaural and stereo signals P1 -Pn are fed to coders C1 -Cn based on the MUSICAM technology, in which the signals are compressed. The data compression digital audio signals M1 -Mn are fed to any of DS1 coder DCA1-DCA16, in which the signals are coded. Signals DS1/M1-DS1/M16 corresponding to DS1 signals with respect to frame structure and additional information appear at an output of the DS1 coder. A 16 DS1/M signal is interlaced with a data multiplexer SFP and combined with a frame synchronizing signal and a data stream directly fed to a 4-PSK modulator is generated. An IF carrier subject to 4-PSK modulation is converted into a satellite transmission frequency by a converter U1 and sent to a satellite, from which the signal is sent again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method and system for transmitting a digital audio signal from a recorder studio to various broadcasting stations in a broadcasting network.

[0002]

BACKGROUND OF THE INVENTION For the planned future digital broadcasting system, it is necessary to transmit a large number of individual programs from each recorder studio of a broadcasting company to an individual master station of a nationally planned broadcasting network. become. So-called DAB broadcasting network (October 1989, Geneva, I
TU-COM 89, "Digital O Stem, Bayern Radio Broadcast)
D igital A udio B roadcastin
g (Digital Audio Broadcasting) provides, for example, a simultaneous broadcasting network. Within that broadcast network, all DAB stations
A plurality of digital audio signals, for example, six stereo signals are clock-synchronized and word-synchronized (word sync).
In chronous), or so-called COFDM signal in bit synchronization scheme (C oded O rthogona
l F request D visionon an
transmit at d M ultiplexing (coded quadrature frequency division multiplexed). Since there may be multiple independent radio coverage areas in a country, there are numerous programs that must be provided to each coverage area or national DAB network. Assuming that there are 4 frequencies prepared for the simulcast network, and assuming that the larger country has 10 broadcasting networks, each of which has 6 programs, this already gives a total of 60 Become a program. Even known and technically mature so-called DS1 / DS
Even though an R (Digital Voice 1 Mbit / s / Digital Satellite Radio System) satellite transmission is used to distribute the audio signal from the recorder studio to the various master stations of the broadcast network, this transmission is for each DSR channel. Limited to only 16 programs, this is insufficient for modern national broadcast networks with regional services. The so-called DS1 technology (D igital S oun
d 1 Mbit / s) (digital voice 1 megabit / s)
Second), two audio signals or respectively stereo signals and additional information are transmitted in a serial flow.
Scale factor (or scale factor: scale f
is introduced for data reduction (European patent application 0133697 and "Neues). r den digitalen Horfunk "
"Digital Audio Coder DC for Audio Audio
A ”paper). These DS made by DS1 coder
16 1-audio signals, so-called DSR technique (D igital S atellite R adio)
(Digital satellite radio) through a data multiplexer and interlaced and fed into a 4-PSK-modulator, for example to a satellite earth station ("Neues v").
on Rohde & Schwarz "114, 1
Page 4). A satellite transmitter transmits to a satellite at, for example, 18 GHz, which in turn transmits at 12 GHz to an individual consumer satellite receiver. The desired audio signal from the 4-PSK demodulated digital signal stream can be selected from all up to 16 digital audio signals through the demultiplexer / decoder and made audible after digital-analog conversion.

[0003]

The use of satellite transmission technology to transmit digital audio signals from a recorder studio to a master station on a broadcast network has already been proposed ("VHF-FM-Transmitter"). Rhde & Schw on "All the Programs and Data Lines"
Arz), October 1990). However, the above-mentioned DS1 / DSR broadcasting technology (digital audio 1 megabit / 1 second / digital satellite radio) is becoming quite common today.
Even with such a combination of the satellite transmission technology, it is possible to transmit a maximum of 16 programs for each DSR channel from the recorder studio to the various master stations of the broadcasting network, as described above. Totally insufficient. Provides a simple method and simple system in which it is economically possible to broadcast a large number of high quality audio signals from a recorder studio to various master stations of a digital or analog broadcast network on the earth That is the object of the present invention. This specifying objective is solved by the method according to the main claim.

[0004]

The digital audio signal transmitting means according to the invention of claim 1 determines the data flow of the digital audio signal (P) to be transmitted by a technique utilizing the psychoacoustic phenomenon of the human ear. A step of first reducing to a data reduced digital audio signal M and a plurality of said data reduced digital audio signals (M ₁ to M _n ) are each coded in the base band according to the DS1 technique and then combined to obtain D
Forming the S1 / M-signal and transmitting one or more of the DS1 / M-signals thus produced by the wideband transmission system according to the DSR technique to various master stations of the broadcast network. It is equipped with. The digital audio signal transmission system according to the invention of claim 3 comprises a broadband transmission link (U ₁ , SAT, U ₂ , E) between one or more recorder studios and various master stations (S) of the broadcasting network. And within that link the source portion of said wideband transmission link is a DSR with 4-PSK-modulator having an output coupled to the wideband transmission link and at least one input coupled to the DS1 coder.
DS with at least one multiplexer (SFP)
The input of one coder is coupled to a plurality (n) of coders (C ₁ to C _n ) which are supplied with all the audio signals (P 1 to Pn) to be transmitted in the link, and the signal source section is a digital audio to be transmitted. DS1-encoded data reduction digital through means in the link where the data stream of the signal is reduced according to the technique of utilizing the psychoacoustic phenomenon of the human ear (MUSICAM), DSR multiplexer and 4-PSK modulator (SFP) Means for transmitting an audio signal as a DS1 / M- signal via a wideband transmission link, and within the link, the receiver section (E) of said wideband transmission link is one or more (M) DSR decoder (DEC ₁ to DEC _m )
And a plurality of (m) DS1 / M'-signals passing therethrough,
Means for selecting from the transmitted DS1 / M- signal and converting it to the original data reduced digital audio signal (M) through the demultiplexer (DEMUX1). In particular systems for implementing this method, especially in DAB transmitter networks, and also on the ordinary VHF-F
Advantageous further improvements on the system for each use in the M transmitter network and also in the extended DSR mode are:
It becomes clear from the dependent claims.

[0005]

The fact on which the present invention is based is that the DS1 is actually known for servicing consumer radio receivers through satellite transmitters for transmitting audio signals from recorder studios to various master stations of the broadcast network. / DSR
The technology is most suitable because the technical means necessary to carry out this method have been found to be highly mature and very satisfactory for a long time. .. DS1 required to implement this method
Coders and DSR multiplexers / modulators have become available on the market, like DSR demodulators, demultiplexers and decoders required at the receiver side. But 1
Only 6 individual programs have such DS1 / DS
It can be transmitted by the R technique, since the known DSR coder provides only 16 DS1 channels. The present invention takes into account the above-mentioned DS1 / DSR technology in the recorder studio and the psychoacoustic phenomenon of the human ear, since it is necessary for future broadcast networks to transmit significantly more programs to individual master stations simultaneously than now. And combined with additional data reduction of the audio signal to be transmitted. Suitable methods for this purpose are, for example, so-called MUSICAM Technology (M asking U
niversal S ubband I ntegrat
ed C oding A nd M ultiplexin
g (mask universal sub-band integrated coding and multiplexing), CCETT, IRT, Ma
“MUSIC” by sushita and Philips
AM, Description of Universal Subband Coding System ". In accordance with this known method, data reduction of a digital audio signal, for example to 128 kbits / sec or 96 kbits / sec, or even 64 kbits / sec, for each monaural signal is achieved by converting a plurality of such data reduction audio signals to DS1. This can be achieved by being able to transmit in a signal. Therefore, this inventive combination makes it possible to transmit a large number of digital signals that could actually be transmitted by the DS1 / DSR technology, which results in an optimal utilization of the system and a system which is available on the market. Can be designed by The method according to the invention is particularly suitable for servicing various master stations of future DAB networks, as explained above. Because it depends on the degree of data reduction applied, one stereo program (or two monaural programs) for each conventional DS1 channel.
This is because 3 to 7 times as many programs can be broadcast as compared with the method using the DS1 / DSR transmitter, which is limited to only 16 stereo programs for each DSR channel. Likewise, the method according to the invention is also suitable for servicing commonly used terrestrial VHF-FM broadcast networks or so-called compatible DAB networks, for VHF-FM broadcast stations any station Only a single digital program signal is emitted within the frequency band. The method according to the invention preferably uses a conventional satellite transmission system as the broadband broadcasting system. However, the transmission is performed by Swi for digital broadcasting service, for example.
It can likewise be done via a broadband cable system of the type used by ss Post (Gen
Report number VD 14.1049 U of January 24, 1991 by eraldilektion PTT). In the same way, DSR signals can also be transmitted via fiber optic distribution networks or radio links.

[0006]

1 and 2 are block diagrams of a system which operates in accordance with the method of the present invention for transmitting an audio signal P from one or several recorder studios to various master stations S of a broadcast network. Indicates. Transmission is known D
It is performed according to the S1 / DSR technique. On the signal source side of FIG. 1, up to 16 DS1 coders DCA ₁ to DC
An A ₁₆ and a DSR multiplexer (SFP) followed by a 4-PSK modulator are provided. The multiplexer includes 16 input terminals for connection with up to 16 DS1 coders. Unlike the DS1 standard, each DS1 channel not only carries a single audio signal, but in accordance with the invention, each DS1 channel also carries n data-reduced digital audio signals M ₁ to M _n . .. Therefore, for each DS1 coder, an audio signal DS1 / M is produced, which has been modified to the DS1 standard and is composed of a plurality of n data reduced digital audio signals, a DSR multiplexer SFP. Is supplied to the input of.

In the embodiment shown in FIG. 1, an analog or digital audio mono or stereo signal P is a coder C operating according to the MUSICAM technique.
₁ to C _n1 respectively. Originally 76
The audio signal P which is supposed to be 8 kilobits / second (16 bits, 48 KHz) and is supposed to be 128, 9
Data is reduced to 6 or 64 kilobits per second. These data reduction digital audio signals M ₁
Through M _n are then fed to one of the ₁₆ DS1 coders DCA ₁ through LDCA ₁₆ . These data-reduced digital audio signals M ₁ to M _n are then coded according to the DS1 method. In a specific embodiment, for example, four MUSICAM coders C ₁ to C _{4 are used.}
Are provided for each stereo signal (n = 4). Therefore, a total of four data reduced digital audio signals M ₁ to M _n are transmitted for each DS1 coder. The MUSICAM coding is preferably performed in advance in the studio. DS1 coding could also be done directly in the studio. But M
It would be possible from the beginning to send signals from ₁ 1 to M _n via a digital line to a satellite earth station where DS1 coding is performed. _At the output of the DS1 coder DCA ₁ to DCA ₁₆ the signal DS1 / M ₁ corresponding to the original DS1-signal for frame structure and additional information
To DS1 / M ₁₆ appear. In the data multiplexer SFP of FIG. 1, the 16DS1 / M- signal is interlaced and combined with the frame sync word to
A stream of data is created that is fed directly to the PSK modulator. Error concealment at the input of a DSR multiplexer according to the DS1 standard has its application overridden according to the present invention. 4-PSK-modulated I.D. F. The carrier is converted by the converter U ₁ into a satellite transmission frequency of, for example, 18 GHz and transmitted to the actual satellite SAT, from which the I.V. F. The carrier is retransmitted at, for example, 12 GHz.

FIG. 2 is a block diagram of the DAB master station. Any single master station S of the operating broadcast network
Also operates in cooperation with the commonly used satellite receiver E. In the satellite receiver E, the satellite signal received via the satellite antenna A is frequency-converted in U ₂ (outdoor unit) and in the satellite converter DSRU, and then converted to a frequency suitable for subsequent decoding. It This converter DSR
The output signal from U is the digital audio receiver DS
Is supplied to the RE, where a plurality (m) of decoders DEC
Decoded in ₁ to DEC _m . It is possible to select up to a few m total of 16 transmitted DS1 / M-signals up to a few m maximum of DS1 / M'-signals.
These DS1 / M'-signals are the original DS from the source.
Although it corresponds to the 1 / M-signal (see FIG. 1), it has a different frame structure. m number of DS1 / M '
Any of this whole of the signal is a demultiplexer DE
The original MUSICAM signals M ₁ to M _n are converted through the MUX, and these signals are then supplied to the modulator COFDM of the master station S as digital audio signals. Thereby, a desired program can be selected from a large number of all programs P (P ₁ to P _n ) provided from the signal source (FIG. 1) side, and these programs can be broadcast. DCA _{1 at the} signal source side
To the DSA coder of DCA ₁₆ and going through satellite receivers including multiplexers, satellite transmitters, satellites, demultiplexers, the actual DS1 / DSR satellite transmission technology is of known structure, eg "Neues".
von Rohde & Schwarz "No.
114, 14 pages. Rohde & S
The chwarz coder DCA is used, for example, as a DS1 coder. A multiplexer including a 4-PSK-modulator is a unit S of Rohde & Schwarz.
It may be FP. Satellite receiver is Rhde &
Schwarz Digital Audio Converter DSR
It does not matter even if it is a combination of U and a digital audio receiver DSRE. MUSI used additionally
The CAM coders C ₁ to C _n consist of commercially available chips, so that the transmission system according to the invention can be made in a very economical way.
The difference with the known DS1 / DSR transmission technique is that one L / R stereo signal for each DSRl channel encoded according to the known 16 / 14-bit floating point arithmetic with scale factor is no longer transmitted.
However, again, a plurality of data-reduced digital audio signals M ₁ to M _n are transmitted over the range of the net bit transmission rate of each single DS1 signal of 896 kbit / s, and the audio signal is transmitted to the human ear. Corresponding data reduction based on the psychoacoustic phenomenon of
Exists in. The scale factor technique in DS1 and its associated bit shift technique can be retained. This is because the scale factor is safely transmitted with 21 samples per block using 64 samples. However, this can be overridden by simply fixing the scale factor to SKF = LOGIC 100, for example. So 14
The bits are transmitted without bit shifting. DS1 interface is 1 at 32KHz sampling rate
6 bits / twice the standard internally configured, one of which
Twice the four bits are available as a net bit rate for transmission. Therefore, the total net capacity of the DS1 signal is available for transmission at the parallel inputs of the DS1 coder, respectively. This net bit rate can be adapted to multiples of the 32 KHz clock rate in a very simple way. Next, the clock speed is, for example, MUSI.
CAM data reduction is used to directly address the bit rate of audio baseband coding. 63 /
Block coding in the DSR channel with the 44BCH code results in a distinction between protected and unprotected bit transmission. Protected here means that 2 bits of error can be corrected for each BCH block, so there are bits available in each DSR channel for each DS1: 2 × 11 bits / 32 KHz DSR-- Protected, 2x3 bit / 32KHz DSR-not protected. This distinction can be canceled by scrambling at the input of the DS1 coder. Furthermore, MUS
Baseband coding, such as ICAM, includes its own error protection. For example, pit error rate BER <
Due to 10 ⁻³ , the intrinsic quality of MUSICA is hardly affected. Since this BER condition also holds for DSR, 3 unprotected bits per 14 bits can also be used there.

FIG. 4 shows the number of program channels L / R and monaural per DS1 channel and per DSR channel. There DSR
-Protected and MUSICAM-A distinction is made between protected channels and simply MUSICAM protected channels. For example, this table shows MU for baseband coding using 64 Kbits / S / Mono.
Specify SICAM64. The calculated channel is
It is based on the integer number of L / R stereo signals per DS1 channel. Satellite receivers operating on the DSR principle are currently available for both consumer and professional types. Both use a demultiplexer / decoder as a chip component (for example, PhilipsS
emaducer SAA7500). In this way, any receiver E can be simply and inexpensively assembled from commercially available components. The demultiplexer / decoder supplies the DS1 / M'-data in a bit-serial manner to the output without bit error correction and to the second output after error correction according to the DSR standard. These data are derived before the "hidden" switching action. For example MUSIC
After demultiplexing (restoring from multiplexing) corresponding to the AM signals M ₁ to M _{n ′} , the DS1 / M ′ data is supplied to the COFDM modulator of the broadcasting station, and the broadcasting station uses the known DAB broadcasting network principle. Enable broadband broadcasting of programs according to. This situation can be seen in the publication Baye mentioned above.
“Kunfti” by rische Rundfunk
ge System der digitalenH
orfunkubertragung ". This part of every single master station S also has a known configuration. CO in DAB simulcast network.
The FDM signal must be clock synchronous and word synchronous (ie bit synchronous). Achieving clock synchronization is achieved by the DS1 coder with all DS1 / M- signals and DS.
1.024 so that each R- signal is clock-synchronized
It is performed by saying that it is synchronized with the clock signal CS1 of MHz. In order to achieve the additionally required word synchronization, part of the DS1 data channel Al with a net bit rate of 24 kbit / s, the so-called U / V channel for additional information, or the DSR signal frame A part of the free section in the so-called special service main frame B (special information S1 of the 32 kbit / s DSR frame), etc., is used for transmitting the corresponding word synchronization signal. The "word synchronization signal" additionally transmitted in this way can be used in all single master stations for word synchronization of the broadcast program. The method according to the invention is likewise suitable for transmitting audio signals from a studio to individual stations of a VHF-FM broadcast network according to FIG. The source portion of the satellite transmission link is again assembled as in FIG. On the other hand, each single FM according to FIG.
The receiver part of the satellite transmission link consisting of the broadcasting stations FM ₁ to FM _n comprises individual MUSICAM decoders D ₁ to D.
an additional D / A-converter connected to the output of _n ,
This is separated via the demultiplexer and MUSI
An analog audio signal broadcast by a broadcasting station is created from a digital audio signal decoded by CAM broadcasting. Similar to the program delivery to VHF-FM stations, the method according to FIG. 2 can also be used for DAB stations with only one digital program signal per station. This so-called "compatible DAB"
Is also based on MUSICAM, VHF-FM
Figure 4 illustrates an in-band solution that utilizes bandwidth. VH
In F-FM transmitter systems, the so-called Radio Data System (RDS) is common, by means of which program-dependent data that can be produced, for example in a recorder studio, is transmitted together to the user. According to the method of the invention, these RDS signals are also V
It can also be transmitted to the RDS coder in the HF-FM transmitter. There, program-dependent RDS data Al1 to A
ln is addressed in the recorder studio for all single MUSICAM channels M ₁ to M _n , combined by multiplexing and another information unit Al-
The MUX is formed and then transmitted on the DS1-signal on the additional information channel, which information is D
It is routed into the S1 coder DCA ₁ to DCA ₁₆ .
These additional data are stored in the DSR receiver DS in the broadcasting station S.
It is read out as separate data in the RE, and after demultiplexing the signal of the demultiplexer DEMUX, it is supplied to the RDS coders RDS-C ₁ to RDS-C _n of the FM transmitter. Of course, the transmission techniques shown in FIGS. 1, 2 and 3 can be used jointly. For example, program DA
It is when the B broadcast network and the FM-broadcast network operating in parallel have to be supplied at the same time. Furthermore, it is not separately necessary to use all the DS1 channels of the transmission system for the purposes of the invention to produce a DS1 / M- signal consisting of a plurality of additionally data-reduced audio signals.
On the contrary a portion of the 16 available DSDl-channels is a digital DS with no pure data reduction.
It is quite possible to supply both 1 audio signals in the usual way and to utilize only the remaining DS1 channels for the purposes of the invention, but with different data rates. The method according to the invention can also be used directly to extend the known digital broadcasting system DSR (extended DSR or EDS).
R). To this end, a consumer receiver for receiving DSR satellite broadcasts has a corresponding MUS with individual selection logic.
All that is required is to provide an ICAM decoder chip.
The user of such a receiver can directly select and listen to the desired data reduced digital audio signal from the digital audio signals transmitted in accordance with the method of the present invention. This makes it possible to extend the known DSR transmission system up to several times the programs offered so far.

FIG. 5 is a block diagram of Philips DSR's star broadcast receiver FT990, a digital audio transmitted in accordance with the present invention to a consumer receiver that may be obtained in such a market. It shows if supplementation can be done in a simple way to receive the signal directly. Basically, this consumer receiver of FIG. 5 is based on the Rohde & S shown and described in FIG.
It corresponds to the device combination DSRU in combination with chwarz's digital audio receiver DSRE. The signal received via the satellite antenna is converted in the tuner by a subsequent frequency converter to an intermediate frequency of 118 MHz and then fed to the 4-PSK-demodulator. The demodulated signal is supplied to the DSR coder SAA7500. The decoded signal is supplied to the D / A converter through the digital filter, and the stereo sound signal received via the satellite at the output of the analog filter can be used for the subsequent processing. The structure available in this market for consumer receivers is
It can be easily modified to provide a receiver suitable for directly receiving the digital audio signal transmitted by the method of the present invention over a satellite link, simply by adding a demultiplexer DEMUX and a program selection logic M-select. it can. Outputs TFKN and D of DSR decoder
The IE or DEC is coupled to the demultiplexer DEMUX and the output TFKN is 160 bits / frame (3
Supply a clock signal of 1.25 μS) and output DIE
Provides the DSR-DS1 / M'- signal in the form of bits / blocks in uncorrected form, the output DEC being the DSR-
63 bits in the form of correction-BCH-D in the state of Brox
Supply the S1 / M'- signal. Output DEC or DIE
From the demultiplexer DEMUX from DS1 /
The M′-signal is the original MUSICAM signal M ₁ to M _n.
And the user desired MUSICAM signal is selected by the selection logic M-select associated with the output of the demultiplexer and the selected MUSICAM signal is
Also available on the market, eg Philips
MU in the latter stage, such as those manufactured by Semiconductor
It is supplied to the SICAM decoder. Above MUSICAM
The decoded signal of the decoder is then supplied to the input of the D / A converter via the selection switch. In this way, the consumer can select and listen to any desired MUSICAM signal provided to the source side via the satellite link. Also, the selector switch may be operated in its original mode, ie, in a mode capable of transmitting up to a maximum of 16 stereo signals per DSR, or alternatively at other positions of the switch, the MUSICAM-encoded audio signal may be analyzed to obtain a plurality of signals. Either way, the audio signal is transmitted in each single DS1 channel and can be selected by the user, allowing either consumer type receiver to be used. Due to this simple extension of the consumer DSR receiver with a MUCIAM decoder and a simple demultiplexer circuit, the number of programs available to the user is also increased when using MUSICAM, for example 96 kbit / s / monaural signal. It is possible to expand from 16 programs of and to 64 stereo programs. Both the MUSICAM decoder and the demultiplexer are simple LSI chips available on the market and the available programs can be scaled up in multiples of four, for example in a very economical way. While this invention has been described with reference to its specific illustrative embodiments, many variations and modifications of this invention will be apparent to those skilled in the art without departing from the spirit and scope of the invention. become. Therefore I am entitled to include all such variations and modifications within the scope of the patents to which they are entitled, as they may reasonably and justly be included within the scope of my contribution to this technology. It is intended.

[0011]

INDUSTRIAL APPLICABILITY Means in a link for reducing the data stream of a digital audio signal to be transmitted to a signal source unit according to a technique (MUSICAM) utilizing the psychoacoustic phenomenon of the human ear, a DSR multiplexer and 4-PSK-modulation. Means for transmitting the DS1-encoded data-reduced digital audio signal as a DS1 / M- signal through the wideband transmission link.
Various types of audio signals by DS1 / DSR transmitters, which were conventionally limited to one stereo program (or two monaural programs) for each DS1 channel, and were limited to only one stereo program for each DSR channel. Compared to the transmission method to the master station, it is possible to broadcast many programs that are 3 to 7 times as many.

[Brief description of drawings]

FIG. 1 is a block diagram on the signal source side of a satellite transmission system used in the method according to the present invention.

FIG. 2 is a block diagram of a satellite transmission system-related reception portion on the master station side of the DAB broadcasting network.

3 is a block diagram illustrating a modified version of a system for providing signals to the VHF-FM broadcast network shown in FIG.

FIG. 4 is a diagram listing the variety of programs that can be transmitted on each DSR channel according to the method of the present invention.

FIG. 5 shows a conventional DSR consumer receiver for directly receiving audio signals transmitted by the method of the present invention,
It is a block diagram which shows how it can be modified.

[Explanation of symbols]

C ₁ , C ₂ , ..., C _n MUSICAM technology coder M ₁ , M ₂ , ..., M _n reduced digital audio signal DCA ₁ , ..., DCA ₁₆ DS1 (digital voice 1 megabit / 1 second) coder DSR DSR (digital) Satellite radio) Multiplexer U ₂ Outdoor equipment DSRU Satellite converter DSRE Digital audio receiver DEMUX Demultiplexer DEC Decoder DIE DSR Decoder output COFDM coding Quadrature frequency division and multiplex modulator D ₁ , ..., D _n MUSICAM decoder RDS-C _1, ..., RDS of _RDS-C n FM transmitter
(Radio data system) Coder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04B 14/04 Z 4101-5K

Claims (10)

[Claims] 1. A method of transmitting a digital audio signal from a recorder studio to various master stations of a broadcasting network, comprising: a data flow of a digital audio signal (P) to be transmitted; a psychoacoustic phenomenon of a human ear. Depending on the technique used, the data reduction digital audio signal M is _first reduced and a plurality of the data reduction digital audio signals M ₁
, M _n ) are each coded in the base band according to the DS1 (Digital Voice 1 Megabits per second) technique and combined to form a DS1 / M- signal, and a DS1 / M thus produced. A method of transmitting a digital audio signal, comprising the steps of: transmitting one or more of the signals from a broadband transmission system to various master stations of a broadcast network according to DSR (Digital Satellite Radio) technology. 2. The method according to claim 1, characterized in that the DS1 / M-signal is transmitted to various master stations via satellite or cable transmission links according to DSR technology. 3. A system for transmitting a digital audio signal from a recorder studio to various master stations of a broadcast network by the method according to claim 1 or 2, wherein the system comprises one or more recorder studios and various broadcast networks. Broadband transmission link (U ₁ , SAT, between master stations (S)
U ₂ , E), in which the source part of the wideband transmission link has at least one of the 16 outputs coupled to the wideband transmission link and the DS1 coder. PSK-at least 1 DSR multiplexer (SFP) with modulator
The input of the DS1 coder is coupled to a plurality (n) of coders (C ₁ to C _n ) supplied with audio signals (P1 to Pn) to be transmitted in the link, and the signal source section is to transmit. The digital audio signal data stream is DS1-encoded through a means in the link, a DSR multiplexer and a 4-PSK-modulator (SFP) to reduce according to the technique of utilizing the psychoacoustic phenomenon of the human ear (MUSICAM). Means for transmitting a data reduced digital audio signal as a DS1 / M- signal via a wide band transmission link, and within the link, the receiver section (E) of the wide band transmission link comprises: One or more (m) DSR decoders (DEC ₁ to DEC _m ) through which multiple (m) DS1 /
M'-signal is selected from the transmitted DS1 / M-signal and is converted to the original data reduced digital audio signal (M) through the demultiplexer (DEMUX1). Transmission system. 4. A system for transmitting a digital audio signal from a recorder studio to various master stations of a DAB (digital audio broadcasting) broadcasting network, wherein the reconverted data reduced digital audio signal (M) is a DAB master signal. System according to claim 3, characterized in that it is fed directly to the modulator (COFDM) of the station (Fig. 2). 5. The system of claim 4, wherein the DAB station broadcasts only a single digital program signal by utilizing the VHF-FM bandwidth. 6. The DS1 coder is clock synchronized and D
6. A synchronization signal is transmitted in the part of the side information channel of the S1 / M-signal or the DSR-signal, and the supply of the digital signal to the broadcasting station modulator is word-synchronized through the signal. Transmission system. 7. A system for transmitting a digital audio signal from a recorder studio to various transmitting stations of a VHF-FM broadcasting network, comprising a restored data reduced digital audio signal (M).
To a decoder (D ₁ to D _n ) corresponding to a source coder using the psychoacoustic phenomenon of the human ear, and the original, non-data-reduced digital audio thus restored. signal, digital - system of claim 3 (to no FM ₁ FM _n) VHF-FM transmitter broadcasting station as an analog audio signal through the analog converter being fed to the modulator, characterized by. 8. A system for simultaneously transmitting program-dependent RDS data produced in a recorder studio together with an audio signal, wherein all data-reduced digital audio signals (M) RDS (radio data system). The data is combined, fed to the DS1 coder and transmitted in the additional information part of the DS1 / M- signal and fed as separate data at the output of the DSRP decoder (DEC ₁ to DEC _m ) in the VHF-FM station. is, the system of claim 7, characterized in that it is supplied to the RDS coder Bu of separated again VHF-FM- transmitter (to no _{RDS-C 1 RDS-C n} ). 9. A portion of all of the DS1 channels of DSR coder 16 are used to transmit non-data reduced DS1-signals, while only another portion receives such signals with different reductions. System according to any one of claims 3 to 8, characterized in that it is used for transmitting a DS1 / M- signal consisting of a data-reduced digital audio signal (M) containing. 10. A system for directly receiving an audio signal transmitted through a wideband transmission system according to the transmission method of claim 1, wherein the psychoacoustic phenomenon of the human ear is used, so that a general consumer can use it. Type DSR receiver has an additional coder corresponding to the source coder of the satellite or cable transmission link, said receiver further having a demultiplexer and selection logic for selecting the desired program. Characteristic direct reception system.