Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
  • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
  • H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/06—Receivers
  • H04B1/16—Circuits
  • H04B1/1646—Circuits adapted for the reception of stereophonic signals
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
  • H04B1/64—Volume compression or expansion arrangements
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
  • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
  • H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
  • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
  • H04H60/13—Arrangements for device control affected by the broadcast information
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H2201/00—Aspects of broadcast communication
  • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
  • H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L7/00—Arrangements for synchronising receiver with transmitter
  • H04L7/0079—Receiver details
  • H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks

Definitions

• the invention relates to a transmission method according to the preamble of claim 1 and to a receiving method according to the preamble of claim 5.
• the signal dynamics i.e. to narrow the level difference between the quietest and the loudest tones
• the lower level limit above the noise level of the transmission link
• the upper level limit below the control limit of the radio channel, which depends on the maximum frequency swing, e.g. 50 kHz with FM.
• the original dynamic of a compact disc signal intended for transmission is reduced from 70 dB to 35 to 40 dB.
• This narrowing takes place in the broadcasting studio by the sound engineer before the program signal is transmitted to the transmitter as stereo left (L) and right (R) signals, where in the case of conventional FM broadcasting by (L + R) - and (LR ) Matriculation and FM modulation of the (LR) signal with 38 kHz carrier suppression, a multiplex signal is generated which is modulated onto the RF carrier (transmit frequency) in frequency modulation.
• a transmission of the control signal mentioned within the radio data system "RDS" (see Doc. Tech. No. 3244-E of the European Broadcasting Union) apparently fails due to the special features of the RDS system.
• the additional information of the RDS system is static data which is stored on the transmitter and read out by a remote control command from the studio without time-critical reference to the program signal.
• the RDS data read out are compiled in a standardized data format and modulated onto a 57 kHz subcarrier in 2-PSK modulation.
• the modulated subcarrier is inserted into the multiplex signal (which is only generated at the transmitter), which is the reason that the RDS coders, including data storage, are arranged on the transmitter and not in the studio.
• the multiplex signal thus supplemented is then modulated onto the RF carrier in FM. Since the reading and formatting of the RDS data is not exactly correlated with the program signal (which is also not necessary because of its static character), the RDS system currently in use is not suitable for transmitting the control signals mentioned for variable dynamics.
• the invention is based on the object of specifying measures on the transmitter and receiver side in order to be able to transmit and receive the time-critical control signal for variable dynamics.
• the invention is based on the consideration that when using the RDS system to transmit the control signal for the variable dynamics, the RDS data stream, including the control signal data inserted therein, is to be completely generated in the broadcast studio, that is, where there is an exact time correlation to the useful signal, ie the radio program signal, can be guaranteed.
• the RDS data stream is transmitted at the same time as the stereophonic radio program signal (present as an L and R signal, for example) to the mother transmitters of a coverage area (eg North German radio) where the RDS data stream is transmitted to an auxiliary carrier (for example 57 kHz ) modulated and inserted into the multiplex signal obtained from the L and R signals of the radio program signal. Delays in the currently practiced RDS System caused by reading and formatting the RDS data on the mother transmitter are avoided in this way.
• the control signal can be transmitted with a significantly larger transmission capacity and thus resolution than is possible with the known transmission at the low-frequency band end of the useful signal. Furthermore, the susceptibility to interference of the RDS data stream modulated on a 57 kHz subcarrier is considerably lower than the control signal stored at the low-frequency end of the band, resulting overall in a significantly improved transmission for the control signal of the variable dynamics.
• the reception and the evaluation of the transmitted control signal by the receiver have been improved.
• the receiver-side components for demodulation and decoding are already available for the RDS system and the control signal inserted therein, so that additional receiver equipment is available can restrict a module for evaluating the control signal demodulated and decoded in the RDS module.
• FIG. 1 shows a schematic representation of the broadcasting supply of a transmission area consisting of two sub-areas according to the transmission method according to the invention
• FIG. 2 shows a block diagram of a mother transmitter adapted for the transmission method according to FIG. 1 and 3 shows a block diagram of a radio receiver according to the invention for receiving and evaluating the control signal for the variable dynamics emitted according to the transmission method according to FIG. 1.
• the first radio program of the North German Broadcasting Corporation, NDR 1 has a first sub-area GI (e.g. Schleswig-Holstein) and a second sub-area GII (e.g. Hamburg).
• the radio program, here NDR 1 is "regionalized” at certain times, that is to say that in the two subregions GI, GII the same program is broadcast at certain times and different programs at certain other times. Since the RDS information, for example for program name (PS), program identification number (PI) and alternative frequencies (AF), is different during such a "regionalization", this special fact must be taken into account in a manner to be described become.
• PS program name
• PI program identification number
• AF alternative frequencies
• the coverage area has a main broadcasting studio S, which produces the national radio program and the regional program for the second sub-area GII.
• a regional studio RS that is locally removed produces only the regional program for the first sub-area GI.
• the two studios S and RS are connected via a postal cable route PS2 and PS3 to a mother transmitter B (for the second sub-area GII) and A (for the first sub-area GI).
• the main broadcasting studio S is connected to the mother transmitter A via a postal cable route PS1.
• the main broadcasting studio S supplies both mother stations A and B with the radio program signal, which is transmitted as left (L) and right (R) signals on the postal cable routes PS1 and PS2.
• the main broadcasting studio S only the mother transmitter B with the "GII" program signal, while the regional studio RS only supplies the mother transmitter A with the "GI" program signal.
• the mother transmitter A is connected to daughter transmitters AI to A4 via lines or ball reception routes, while the mother transmitter B is connected in a similar way to daughter transmitters B1 to B4.
• the studios S and RS can be connected to an earth station C of a satellite transmission link via digital links N / RDS1 / RDS2 or N / RDS1. This leads from the earth station C via a broadcasting satellite D to parabolic receiving antennas EA and EB of satellite receiving systems at the locations of the mother transmitters A and B.
• the satellite transmission link has a single digital useful signal channel N and two separate, additional signal channels denoted by RDS1 and RDS2.
• the mother transmitter A receives only the one additional signal channel RDS1 in addition to the digital useful signal channel N
• the mother transmitter B receives only the other additional signal channel RDS2 in addition to the digital useful signal channel N.
• the RDS data for the additional signal channels RDS1 and RDS2 are identical.
• the RDS data are already generated and formatted in the main broadcasting studio S and possibly in the regional studio RS, the time-critical see control signals for the variable dynamics exactly time-corrected to the useful signal (analog or digital) with a special identifier inserted in the RDS data stream and transmitted to the mother transmitters A, B.
• the mother transmitters A, B receive the assigned RDS data stream with the control signal for the variable dynamics in a manner yet to be described and insert the received RDS data stream in a time-correlated manner into the multiplex signal which consists of the L and R signals of the to the Mother transmitters A, B receive a useful signal by means of matrixing and FM modulation with 38 kHz carrier suppression.
• the mother transmitter A shown schematically in FIG. 2 on the basis of a block diagram has the same construction as the mother transmitter B.
• the mother transmitter A receives the useful signal and additional signal channels N and RDS1 transmitted by the radio satellite D.
• the converter 10 (outdoor unit), the 12 GHz RF frequency is converted to approximately 800 kHz, whereupon the channel switch 20 splits into the useful signal channel and the additional signal channel.
• the useful signal N is first demodulated in a demodulator 30.
• the basic signal obtained in this way is converted back into an analog signal in a digital / analog converter 40, whereupon the resulting L and R signals are fed to a stereo matrix 50 in order to generate the matrices L + R and LR available according to the FM standard.
• the matrixed signals are converted in a multiplexer 60 into a multiplex signal in which the (L + R) signal in the frequency range 0 - 15 kHz and the (LR) signal in the frequency range 23 - 53 kHz be ordered.
• the (LR) signal is modulated onto a 38 kHz carrier in FM, which is then suppressed.
• a 19 kHz pilot tone is also used inserted into the frequency gap between the (L + R) and (LR) bands.
• the 19 kHz pilot tone is taken from a 19 kHz oscillator 70, while the 38 kHz carrier is obtained by doubling the 19 kHz pilot tone in a doubler stage 80.
• the multiplex signal at the output of multiplexer 60 is fed to an adder 120, the second input of which is connected to a 57 kHz modulator 100.
• a 57 kHz subcarrier is supplied to the modulator 100, which is generated by tripling the 19 kHz pilot tone in a triplet stage 90.
• the RDS data stream is modulated directly onto this subcarrier (in 2-PSK modulation), which is received in the additional signal channel and is demodulated there by the demodulator 110 into the basic position. Recoding of the demodulated RDS data stream is not necessary.
• the adder 120 inserts the modulated 57 kHz subcarrier, which is fed to it via the modulator 100, into the multiplexer signal coming from the multiplexer 60, which after this addition modulates in a modulator 130 onto the RF carrier of the mother transmitter A in FM and is broadcast as a broadcast signal via the transmission antenna 140.
• a possible time offset between the useful signal and the additional signal channel can be achieved by suitable devices such as Correct delay elements, delay lines or the like.
• suitable devices such as Correct delay elements, delay lines or the like.
• the RDS data stream is transmitted to the mother transmitters A, B via the satellite transmission link.
• the Stereomatrix 50 has additional inputs for connecting the postal cable connections.
• the additional postal cable feed of the useful signal has a reserve function in the event that the satellite transmission of the useful signal is disturbed.
• a radio receiver shown in FIG. 3 feeds the antenna signal applied to a receiving antenna 210 to an input and tuner stage 220, where the desired broadcast signal is obtained from the antenna signal and fed to a demodulator and dematricator stage 230.
• the multiplex signal is obtained by FM demodulation of the RF carrier, from which the (L + R) signal and the (L-R) signal are separated by FM demodulation of the suppressed 38 kHz carrier.
• the stereophonic left (L) and right (R) signals which are fed to a dynamic control element 240, are obtained as LF signals at the output of stage 230.
• step 230 the 57 kHz carrier is also separated from the multiplex signal and demodulated, the resulting RDS data stream being fed to an RDS decoder 250.
• the control signal for the variable dynamics inserted therein is separated from the other parts of the RDS data stream on the basis of its identifier, decoded and fed to a digital / analog converter 260, which is derived from the digital Control signal generates an analog control signal.
• This analog control signal controls the dynamic control element 240 in such a way that the original dynamic of the stereophonic radio program signal is completely or at least partially reconstructed.
• the reconstructed stereophonic signal is reproduced by means of loudspeakers 270, 280. - lo ⁇
• the remaining parts of the RDS data stream are decoded in the RDS decoder 250 and made available as RDS information for further use in the receiver.

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Circuits Of Receivers In General (AREA)
• Selective Calling Equipment (AREA)
• Toys (AREA)
• Radar Systems Or Details Thereof (AREA)
• Transmitters (AREA)
• Mobile Radio Communication Systems (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
• Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6400142

Family Applications (1)

Country Status (10)

Families Citing this family (9)

Citations (2)

Family Cites Families (9)

• 1990
  • 1990-02-14 DE DE4004576A patent/DE4004576C1/de not_active Expired - Lifetime
• 1991
  • 1991-02-06 HU HU922456A patent/HUT63521A/hu unknown
  • 1991-02-06 AT AT91903433T patent/ATE110199T1/de not_active IP Right Cessation
  • 1991-02-06 EP EP91903433A patent/EP0515431B1/de not_active Expired - Lifetime
  • 1991-02-06 DE DE59102573T patent/DE59102573D1/de not_active Expired - Fee Related
  • 1991-02-06 ES ES91903433T patent/ES2063492T3/es not_active Expired - Lifetime
  • 1991-02-06 AU AU72194/91A patent/AU7219491A/en not_active Abandoned
  • 1991-02-06 JP JP91503712A patent/JPH05506969A/ja active Pending
  • 1991-02-06 WO PCT/EP1991/000224 patent/WO1991012674A1/de not_active Ceased
  • 1991-05-31 DE DE4117787A patent/DE4117787A1/de not_active Withdrawn
• 1992
  • 1992-08-13 FI FI923628A patent/FI923628A7/fi unknown
  • 1992-08-13 NO NO923168A patent/NO179159C/no unknown

Patent Citations (2)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events