EP0610313A1 - Systeme de radiodiffusion et recepteur de radiodiffusion - Google Patents

Systeme de radiodiffusion et recepteur de radiodiffusion

Info

Publication number
EP0610313A1
EP0610313A1 EP92922255A EP92922255A EP0610313A1 EP 0610313 A1 EP0610313 A1 EP 0610313A1 EP 92922255 A EP92922255 A EP 92922255A EP 92922255 A EP92922255 A EP 92922255A EP 0610313 A1 EP0610313 A1 EP 0610313A1
Authority
EP
European Patent Office
Prior art keywords
radio
dab
data
signal
program
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92922255A
Other languages
German (de)
English (en)
Other versions
EP0610313B1 (fr
Inventor
Klaus Göken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson oHG
Original Assignee
Telefunken Fernseh und Rundfunk GmbH
Thomson Consumer Electronics Sales GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE4136068A external-priority patent/DE4136068A1/de
Application filed by Telefunken Fernseh und Rundfunk GmbH, Thomson Consumer Electronics Sales GmbH filed Critical Telefunken Fernseh und Rundfunk GmbH
Publication of EP0610313A1 publication Critical patent/EP0610313A1/fr
Application granted granted Critical
Publication of EP0610313B1 publication Critical patent/EP0610313B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
    • H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
    • 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
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/60—Aspects of broadcast communication characterised in that the receiver comprises more than one tuner

Definitions

  • FM-FM and / or AM radio receivers with which an analog FM-FM and / or AM radio signal can be received and processed in a known manner and the corresponding audio and / or video signals can be reproduced in a suitable manner the.
  • radio receivers - also referred to below as analog radio receivers - are available in various embodiments as audio and / or video radio receivers with and without a recording unit. Not only radio broadcasting, but also the classic sound broadcasting of television broadcasting is realized with Freguenz modulation (FM).
  • Radio systems and associated transmitters and receivers as well as parts thereof have recently been developed with which non-compatible radio signals (DAB, DSR, MAC) can be transmitted digitally coded to FM, FM and / or AM as well as PAL, can be received, processed and reproduced in a suitable manner.
  • DAB non-compatible radio signals
  • MAC digitally coded to FM, FM and / or AM as well as PAL
  • DSR digital satellite liten broadcasting
  • DAB digital audio broadcasting
  • DAB and DSR allow high-quality reproduction of the audio signals in CD quality.
  • DAB digital audio broadcast transmission system
  • DAB is generally used as an umbrella term for broadcasting methods or systems in audio and / or Video area used, in which the sound and / or video signals (at least partially) is transmitted digitally coded.
  • VHF-FM and / or AM broadcasting is generally used below as an umbrella term for broadcasting methods or systems in which the audio signals are frequency and / or amplitude modulated in some way and / or the video signals, for example as in PAL or SECAM, are not all in one Time division multiplex can be transmitted as with MAC.
  • a DAB receiving part the tuning to the multiple carrier frequencies of each DAB radio signal in the previous television (UHF) range takes place, as well as the special DAB signal demodulation, whereas in the DAB decoder, channel and exclusively source decoding (with Error correction and error concealment) of the digitized broadcast signals.
  • Retrofitting the existing FM and / or AM radio receivers with DAB receiver and DAB decoder is possible in principle, but also cost-effectively and with many difficulties, e.g. Space problems connected.
  • an analog and / or digital radio communication system and a radio receiver with a low circuit complexity to DEVELOPED for the on d n best receiving n of a desired program, which is broadcast via different mutually incompatible transmission channels, allows a quick switching.
  • the object is achieved in a broadcast transmission system with the features according to claim 1 or 2.
  • Advantageous further developments of the system are described in subclaims 3 to 7.
  • Advantageous refinements of an RDS / DAB decoder or an FM / FM / DAB receiver are described in claims 8-18.
  • Claim 19 describes a transmission arrangement according to the invention for an analog broadcasting system
  • claim 20 describes a transmission arrangement for a digital broadcasting system, for example DAB, MAC, etc.
  • Claim 21 describes a data signal according to the invention.
  • a terrestrial cross-area radio transmission system for FM, FM and / or AM radio is proposed, in which a first control signal is transmitted as a transmission-specific identification signal with an analog FM, FM and / or AM radio signal of a program , which is decoded and processed by an FM, FM and / or AM radio receiver with a suitable control signal decoder when the radio signal is received.
  • the first control signal is assigned to, or intended for, the same program or program as the program currently being received or another transmission system, for example DAB, which is in no way compatible with the FM-FM transmission system.
  • the first control signal also optionally contains information about the frequency range and / or the program position in which the corresponding DAB program can be received.
  • the first control signal is used to control a radio receiver for digital radio (DAB, DSR, MAC) that is combined or connectable with the FM-FM receiver. From the presence of the first control signal itself, a transmission of the program via DAB can preferably be concluded.
  • the first control signal thus transmits information about a broadcast transmission system which is technically fundamentally different from the VHF-FM / AM system, such as DAB, DSR or MAC, D2-MAC, HD-MAC, PAL PLUS etc.
  • the first control signal preferably contains all switchover and / or control parameters for the radio receiver to be controlled for digital radio (DAB, DSR, MAC), so that a quick switchover from FM-FM and / or AM reception to DAB reception is possible.
  • a solution similar to claim 1 is used using a second control signal for a digital broadcasting system e.g. DAB, DSR, MAC etc. and a suitable receiver are described.
  • a digital broadcasting system e.g. DAB, DSR, MAC etc.
  • the first and / or second control signal is preferably only broadcast if the same program or the same program is also respectively transmitted in the other transmission system. In the case of regionalization of a program, if at least temporarily this condition is no longer fulfilled, the control signals are then not transmitted.
  • the first control signal is preferably transmitted within the RDS data stream, so that the first control signal is decoded by the RDS decoder and a digital one Broadcast receiver connected or coupled to the analog broadcast receiver in any way.
  • a digital radio receiver connected to the VHF-FM receiver is controlled, for example switched on, and caused to receive a certain program signal.
  • the analogue radio receiver is controlled, for example automatically muted, with the first control signal when the digital radio receiver takes over the reproduction.
  • RDS or the transmission of the first control signal with RDS surprisingly serves as a decisive technological key or bridge link between the previous analog radio and the future radio such as DAB, although RDS according to its intended purpose only and is intended exclusively for analog broadcasting.
  • a remote control according to the invention of a DAB (FM, FM and / or AM) radio receiver via the FM-FM and / or AM (DAB) transmission channel simplifies the operation of the relevant receiver in a rational manner.
  • first or second control signal e.g. a pilot carrier known from the television transmission system or an ARI (driver broadcasting information) similar signal or a specific auxiliary frequency or a specific phase value can also be used, such a control signal preferably being transmitted outside the RDS transmission channel.
  • a pilot carrier known from the television transmission system
  • an ARI driver broadcasting information
  • both receivers or receiving parts are connected to one another via at least one control line.
  • a control data evaluation circuit is provided in at least one of the two receivers, which evaluates the signals transmitted via the control line and controls both receivers.
  • a combination radio receiver which has a first radio receiver part for receiving, processing and reproducing analog radio signals, such as FM-FM and / or AM, and a second radio receiver part for receiving, processing and reproducing contains digitally coded radio signals (DAB, DSR), one or more common modules, in particular a common control unit, being provided for both radio reception parts.
  • DAB digitally coded radio signals
  • one or more modules such as antenna, HF / IF stage, controls, loudspeakers, LF signal processing, additional data decoder, display, power supply and other suitable circuit parts etc. can be arranged once in the radio receiver, but these are assigned to both parts of the radio receiver.
  • the radio receiver according to the invention is not only able to receive and process analog as well as digitally coded audio and / or video radio signals, but is particularly characterized in that individual suitable components or assemblies only once in the Broadcast receivers are designed, preferably several of the aforementioned broadcast signals, such as PAL / MAC or FM-FM / DAB, can be received, processed and reproduced and there is no impairment in the reproduction quality of the received audio signal.
  • the one-off arrangement of individual components or assemblies for both partial receivers enables an economical implementation of such a hybrid receiver to be achieved, the consumption of materials and resources being limited to the bare essentials and the assemblies or components provided together being used in the best possible way.
  • Such a radio receiver according to the invention has the particular advantage that when DAB is introduced, analogue radio broadcasting can still be received and reproduced on the classic wavebands, with the comfort and the associated reproduction quality being considerably improved.
  • the user of a radio receiver according to the invention is not dependent on when DAB is introduced in what national or European scope and the FM radio broadcast is gradually or completely abandoned. Even after the complete abandonment of individual or all analog FM radio signals, a radio receiver according to the invention can still be used.
  • a common control unit for the digital and analog receiving parts in particular ensures the best possible setting of the receiver and its reproduction quality guarantee. In addition, simple operation can be achieved.
  • Such a cross-divisional FM-FM ⁇ -> DAB control signal transmission can achieve further significant advantages for the radio receiver according to the invention.
  • FM-FM radio receiver according to the invention is now set to FM-FM reception, for example, and receives the NDR 2 program there at 99.8 MHz, it makes sense if the same program is also offered via DAB as a further alternative frequency to transmit a "digital" multiple frequency of the DAB broadcast with the value of the corresponding program position of the desired program in the DAB data stream within the AF list of the FM-FM signal.
  • This "digital" AF and / or the value of the program position of the desired program represents the first control signal which can be decoded in the analog receiver by means of a control signal decoder, here an RDS decoder, and processed accordingly in a data processing unit.
  • the analog / digital radio receiver can then be set by means of the data processing unit so that when such a first control signal is received, a switch is made to DAB reception in order to achieve the best possible reproduction quality. It is also expedient to also transmit the data of alternative frequencies of the AM or FM radio broadcast signals via a DAB additional signal channel of the digital program signal.
  • the data format of the additional DAB data channel is preferably compatible with the RDS data format, so that an RDS data evaluation circuit can also be used for evaluating the additional DAB signals.
  • a mobile receiver reaches the propagation limit of a currently set and reproduced digital program signal, the reproduction can abruptly stop.
  • it is possible to switch over to alternative analog FM, FM or AM reception in good time which means that the corresponding program can still be received even outside the DAB transmission range if the AM or FM reception range is larger than the DAB transmission range is what can occur, for example, as a result of remote reception phenomena in analog broadcasting.
  • coded information about the number of radio programs transmitted in a COFDM multiplex signal is also transmitted in the DAB additional data channel, this information being able to be used on the receiving side for evaluation and tuning to the desired program.
  • Fig.la an inventive radio receiver formed by radio receiver for the reception of digitally coded audio radio signals and / or FM-FM and / or AM radio signals.
  • Fig. Lb an alternative representation to Fig. La
  • FIG. 3 shows a block diagram of an operating device for a radio receiver according to FIG. 1
  • FIG. 4 shows a block diagram of a VHF-FM receiver which is connected to a DAB receiver via a control line.
  • 5 shows a flow diagram of an operating device.
  • FIG. 6 shows a block diagram of a transmitter arrangement.
  • FIG. 7 shows a flow diagram of a PI code evaluation.
  • FIG. 8 shows a block diagram of an inventive system
  • Transmitting and receiving arrangement for television Fig.9 a structure of a display unit
  • Fig.la shows a radio receiver 0, which is able to receive DAB radio signals as well as FM-FM / AM radio signals, process them and play them back in a suitable manner.
  • individual assemblies for a digital receiving part 5 and also for an FM / FM / AM receiving part 6 are used together.
  • Such a radio receiver can be referred to as a hybrid receiver, since it has two fundamentally different receiving parts 5 and 6 or an analog and a digital receiving train, with as many assemblies or circuit parts as possible being combined or "married" for both receiving trains.
  • Such a radio receiver can also be a television receiver 80 according to FIG. 8, the combined circuits for receiving and processing analog as well as digital audio and / or video signals, which are in one or more of the known standards such as PAL, SECAM, NTSC, PALPlus , MAC, D2-MAC, HD-MAC, etc. are transmitted. Additional signals as well as the first or second control signals can be transmitted separately or together with these in a vertical blanking interval such as the VPS or television text signals.
  • the known standards such as PAL, SECAM, NTSC, PALPlus , MAC, D2-MAC, HD-MAC, etc.
  • the analog and digitally coded broadcast signals are received by the transmitters via an antenna 1 and fed to a common HF / IF stage 2.
  • a single HF / IF stage 2 tuning unit or tuner that is suitable for the transmission spectrum can be used.
  • the reception frequency must be HF / IF stage 2 can be expanded to this or two or more separate HF / IF stages 2a and 2b according to FIG. 1b are generally used for both receiving parts 5 and 6, which can each be adjusted to the required frequencies.
  • the radio receiver has optimized and adapted and / or standardized and interchangeable HF / IF stages or HF / IF modules for each receive train 5 and 6, since this is particularly useful can improve the observability of the respective recipient trains. This makes it easy to switch from different programs from DAB to FM or vice versa without delay in switching and thus without playback pauses. If the frequency range of DAB or FM-FM is redistributed, only the corresponding HF / IF stages or modules designed for this need to be replaced.
  • the HF / IF stage 2 is tuned by a common central control circuit or control unit (microprocessor) 3.
  • the received digitally coded but analogue transmitted audio signals are digitized by means of an A / D converter.
  • the HF / IF stage 2 as a digital HF / IF stage or HF demodulator, the received signals can already be digitized there.
  • the actual digital signal processing is handled by at least two highly integrated circuits, an IF signal processor and an audio signal processor in the DAB receiving section (both not shown).
  • COFDM Coded Orthogonal Frequency p_ivision Multiplex
  • MUSICAM is a method for baseband coding of audio signals.
  • COFDM represents the channel coding in DAB and essentially solves the problem of terrestrial multipath reception . Echo signals even contribute positively to the useful signal.
  • the key to this is the division of the data stream into many, for example 1536, carriers with 4-PSK modulation of the individual carrier, orthogonal carrier arrangement, the introduction of a protective interval for using the multipath signals and an interleaving of the program signals in the time plane.
  • a DAB tuner will be tunable to each of the COFDM frequency positions (all in one frequency range, e.g. TV channel 12), the COFDM decoder selects a stereo signal from this multiplex signal.
  • the HF / IF part 2 (or splitter) constructed in conventional technology delivers a signal from which the IF signal processor in the DAB circuit 5 extracts the data stream contained therein.
  • the data stream is structured in terms of frames (frames), each frame initially having a header, a so-called header, which contains the status information of the frame. Another part of the frame contains data that are suitable for error detection. A next part of the frame represents the actual digitized audio data or audio samples. Another part of the frame, the so-called stuffing bits, are arranged between the audio data and scale factor protection bits.
  • the decoder can use the information of the protection bits, which are designed as parity bits or CRC words (Cyclic Redundancy Code), for scale factor error correction or concealment.
  • Another part of the frame are additional signals, so-called "program associated data", which are partly already arranged in the header and defined on the transmission side.
  • an LF audio signal is made available at the output of the DAB circuit 5 for further processing and playback.
  • the pre-filtered VHF-FM / AM signal is used to convert the HF / IF pre-stage into a mixing stage, demodulation in a demodulator and amplification and AF processing in an NF Stage, etc. an LF signal is obtained and made available at the output of the circuit 6.
  • Both receiving parts 5 and 6 are connected to a central control unit 3 or data and audio signal processor via unidirectional and / or bidirectional control lines controlled by this or switched on / off.
  • the desired program in the desired setting can be set individually for each reception train via an operating device 9.
  • the central control unit 3 which is designed as a microprocessor, one of the signal outputs 7 or 8 of the circuits 6 or 5 is now muted and the desired audio signal is thus reproduced on the loudspeakers 16.
  • the output control amplifier circuit 11, which is controlled by the central control circuit 3 and has inputs which are connected to the outputs 7 and 8 of the two receiving parts 5 and 6, is suitable for muting as well as for LF signal processing. Where necessary, shielding means (not shown) are provided which prevent individual assemblies from being disturbed by other assemblies.
  • Corresponding operation and programming of the two receiving parts of the hybrid receiver can be carried out via an operating device 9 via the central control unit 3.
  • the desired information such as program name and / or area name about digital or analog radio reception, as well as operating and / or program steps, are shown on a common display 10 or screen 80.
  • the cross-area control signal transmission enables a quick display of all of the area names via which the desired program can be received.
  • the DAB-specific digital signal processing circuit 5 has a digital output 12, via which digitally coded additional and / or useful data and / or control signals are output and with a recording and / or playback device such as connected to the hybrid radio receiver DAT, DCC, MOD can be recorded and played back.
  • the digital output 12 is preferably connected to the output of the channel decoder, so that in a DAB recorder connected to the output 12 the DAB source decoder data-reduced data can be recorded and reproduced as 16-bit PCM signals.
  • the hybrid radio receiver has a first analog output 13, the analog values of the analog values of which essentially correspond to the digitized values at the output 12 of the DAB-specific digital signal processing circuit 5. The signals from this output can also be recorded using a connected recording and / or playback device.
  • the hybrid radio receiver has a second analog output 14, which is connected to the output of the FM / AM signal processing circuit 6.
  • both analog outputs can also be implemented as a single output to which the LF signal to be reproduced or the first or second control signal is always present and e.g. is checked by a comparative measuring device. It may be useful to provide a separate unidirectional and / or bidirectional data input and / or output line 35 for the control unit 3, via which e.g. Control data of the control device are made available at an output of the receiver and / or control data, e.g. Information such as a CT code (clock time and date) known from RDS or information about the type of transmission is supplied for programming the control device, which can then be stored or fed to a recording / playback device for controlling it.
  • CT code clock time and date
  • the hybrid receiver has a central memory 15 in which the additional signals transmitted with the analog broadcast signals as well as with the digital broadcast signals as well as first and / or second control signals are stored and in a suitable manner for tuning or Signal processing or control of the individual circuits or circuit parts can be used.
  • 15 further data processing programs and / or data for controlling the tuning, program setting tion, playback, operation, display etc. saved.
  • the RDS signals, additional DAB signals and / or the first and second control signals are processed and evaluated by the central control unit 3.
  • a pre-evaluation of the aforementioned signals with separate data processing and control circuits (not shown) in the VHF-FM receiving section 6 and DAB receiving section 5 is also possible and can also be advantageous.
  • the PI code program chain identifier
  • the PI code consists of a code (16 bits) which allows the recipient to differentiate between nationality, program area / language area and program code.
  • the PI code is not intended for direct display, it is individually assigned to each radio program and is used to identify FM radio stations that emit the same program.
  • the receiving part 6, in conjunction with an RDS decoder contained therein and the central control unit 3, is able to automatically search for an alternative VHF-FM frequency in the event that the set transmitter becomes too bad during mobile reception.
  • the AF code consists of a code (8 bits) which contains an alternative carrier frequency of the program listed in the PI code.
  • FIG. 2b shows the data format according to FIG. 2a expanded by a first control signal or second identification date (claim 8) or control information, which data format is broadcast by an FM-FM / AM transmitter 60 according to FIG. 6.
  • FIG. 2c shows a data format in which the length of the data format according to FIG. 2a is retained, but an AF code is replaced by 8-bit information about a DAB program channel. While in the data format according to FIG. 2b the block length of the format is expanded and the number of AF codes compared to FIG. 2a is retained, it is true in FIG. 2c the block length corresponds to the data format in FIG. 2a, but with one AF code word less.
  • the data format according to FIG. 2c may have some advantages in data processing with conventional RDS decoders.
  • the digitized first control signal is provided with its own error protection or special error-correcting data.
  • the radio receiver can quickly determine that the program currently being received via FM or FM can also be transmitted via DAB is transmitted and is to be received.
  • the DAB code optionally also contains the information at which program position the program in a data frame with several programs having several program positions (see DSR - Specification) is arranged.
  • An ensemble of individual carrier frequencies of a data frame is preferably contained in the DAB code or else, for example, the program identifier NDR 2 or the corresponding PI code and further control signals for the DAB receiving part 5 in the DAB code.
  • markings can also be made in the RDS data office, for example a group type number GT which is typical for DAB broadcasting and which has not been used for previous FM radio broadcasting or is not intended. Since the group type number is always available at the beginning of each block, such a marking with DAB's own GT, for example a GT number that has not yet been assigned. between the numbers 8 - 14, which may be very advantageous for a quick evaluation, in particular if, after the DAB-own GT, the corresponding program position corresponding to the current program or radio broadcast is in the DAB area, so that the corresponding program position is called up immediately can be. In addition, none occur when using a DAB-own GT number Compatibility problems for the previous ones
  • the RDS decoder or the data processing and control circuit assigned to it (Fig. 5), e.g. the central control unit 3, on the basis of the evaluation of the first control signal, that a specific program or program, for example NDR 2, can also be received via DAB.
  • NDR 2 is called up by the user via the operating device 9, the hybrid radio receiver switches automatically or after pressing a button 30 to DAB reception by means of the DAB receiving part 5 and switches the FM-FM receiving part off or into a stand -by mode or continues to receive the set FM-FM program, but this is muted. An alternative frequency may no longer be called up. The best possible reproduction quality is thus achieved.
  • the switchover from FM reception to DAB reception can thus be implemented as quickly as possible without the user himself having to carry out such a switchover. If the first control signal or the DAB code cannot be decoded or evaluated after one or more attempts, the desired program is called up via the preset FM / FM frequency or using a known PI and / or AF code. Evaluation sought an alternative frequency with which the best reception is possible.
  • the PI code is evaluated in the control unit 3 assigned to the RDS decoder.
  • the transmitter identification of the PI code for example "NDR 2”
  • NDR 2 can be determined as a binary value.
  • the switchover criterion for DAB or DSR reception can be determined within a very short time.
  • the comparison list is preferably stored until it is replaced by a new comparison list.
  • the program identification signal SK-PI for NDR 2 matches one of the program identification signals SK-DAB 0 ... n listed in the comparison list, either the system automatically switches to DAB reception of the desired program or is displayed to the user, so that a switchover by means of pressure on a specific key e.g. the button 30 of the operating device 9 (FIG. 3) can be carried out.
  • the PI code of the RDS signal is used as the first control part signal and is evaluated accordingly as the control signal for switching on a specific program in the DAB receiving part or receiver.
  • the PI code other information from the radio data, such as e.g.
  • the PS code (station name or name of the program chain) can be evaluated as a switchover criterion.
  • an input unit 9 provided for this purpose (e.g. a speech recognition system which converts the human voice into electrical operating commands).
  • the radio receiver is a television receiver, for example according to FIG. 8, one of one is received upon reception Program broadcasting studio 83 transmitted via PAL a corresponding first control signal if the same program is also transmitted, for example, also via MAC with a satellite and is displayed on the television screen, for example "MAC".
  • Program broadcasting studio 83 transmitted via PAL a corresponding first control signal if the same program is also transmitted, for example, also via MAC with a satellite and is displayed on the television screen, for example "MAC".
  • MAC reception is activated, for example D2-MAC or HD-MAC switched and thus the user the television signal with the best technical audio / video quality is offered.
  • the radio receiver described above is designed as a MAC / PAL video recorder or DAB / FM FM recording device, a broadcasting contribution is recorded in the operating mode, for example MAC, in which the best sound and / or video quality can be guaranteed .
  • the first or second control signal can also be used here as a switching criterion for a PAL or MAC recording of a program transmitted via PAL and MAC. If it is now established in DAB reception in a mobile hybrid receiver that the DAB signals can be severely disturbed, but can still be corrected for errors, the hybrid receiver switches to NDR 2 in VHF-FM reception as soon as a predetermined one Threshold of the reception field strength or a value representative of how the error detection rate BER is undershot.
  • bit error rate BER bit error rate
  • the bit error rate BER bit error rate of the received digitally coded radio signals is measured in the DAB circuit 5 by means of a bit error measuring / correction circuit and this value is fed to the control unit 3. If the bit error rate exceeds a predetermined value (ie the reception quality drops below a predetermined value), which is stored in the memory 15, the control unit switches to VHF-FM if the value is exceeded once, several times or permanently. If the radio receiver is tuned to VHF-FM reception of a certain program anyway and reproduces it, the DAB reception train 5 is switched to playback with preferably simultaneous muting of the analog reception train 6. If a signal from the bit error measurement / correction circuit is present that the DAB reception quality is sufficiently above a predetermined value. Maintaining FM radio reception is expedient, in particular in areas in which an FM radio broadcast signal, but not the corresponding DAB radio signal of the current program, can be received in sufficient quality, although a switchover to DAB is possible.
  • FIG. 3 shows a block diagram of an advantageous operating device 9 for the radio receiver 0 according to FIG. 1.
  • the operating device 9 has range selection keys 17, programmable memory location selection keys 18, a "best quality" key 30, a reception frequency input and program position input 19 with a numerical keyboard and a transmission memory 20.
  • the buttons 17, 18 are connected to the memory 20 as well as to a control unit 24, which is identical to the control unit 3 or is formed separately in the radio receiver.
  • the input unit 19 is connected to the control unit 24.
  • the memory selection buttons 18 as well as the program position input 19 are suitable for the operational setting of FM-FM reception as well as DAB.
  • the control unit registers whether the program assigned to a program key Y can also be received in the area X via DAB.
  • the corresponding program position is assigned to the same program key 18 for the DAB area automatically or after the key 30 or the DAB range selection key 17 has been operated, and the corresponding data for program setting is assigned to the associated location in the transmit memory 20 filed.
  • This can simplify programming. This type of programming can also be carried out in reverse from DAB area stations to other reception area stations.
  • the control unit has determined by evaluating the first control signals. that the programs NDR2 and FFN can also be received via DAB.
  • the corresponding program position is automatically entered at the memory location for the corresponding buttons 18 (one and four) in the DAB area.
  • the primary purpose of the operating device is that the user is always offered a program selected by him in the best reproduction quality. Under certain circumstances, he only notices from the playback quality and the display unit 10 that when a VHF-FM or another analog program is called up, the receiver automatically changes to DAB or DSR reception.
  • the control unit switches the receiver to DAB reception automatically when the memory selection buttons one and four are called or only after the button 30 "best quality" has been operated.
  • button 2 is subsequently pressed, the system switches back to FM reception and the assigned program WDR1 is set (see also Fig. 5).
  • the VHF-FM range selected with a range selection key, but not the selected program, is therefore exited when keys 18 are pressed if the correspondingly selected program is also received via DAB.
  • the control unit then only needs to evaluate the identification signal and make the appropriate circuits and program settings.
  • the display unit 10 shows, in addition to the program name (here NDR 2) and the current area name (here DAB), also the alternative area names (here VHF and MW) via which NDR 2 can also be received.
  • the alternative area names here VHF and MW
  • the corresponding area selection button 17 is pressed.
  • the reception frequency input unit or numeric keypad 19 is suitable for the direct selection of a program via DAB as well as FM-FM / AM.
  • the input unit 19 preferably has a data release key EDI with an enter function. The entered number for the program position can also be released by pressing the button 30 or the DAB button. It is advantageous if each program has its own numerical program position identifier.
  • the numeric keypad 19 is preferably connected to a decimal / binary converter in the control unit, which generates an 8-bit binary word from an entered number between 0 ... 255, the assignment between a decimal number and a binary value also from User can be set individually.
  • the binary value of the entered decimal number is then evaluated by the control unit as a program reference number.
  • the program reference number is part of the PI code (bits 9 to 16) of the desired program transmitted with RDS and is stored in the transmitter memory 20. Since each program is assigned an individual program reference number or typeface data, it is therefore also possible to call up a program by entering it using the numeric keypad without the user knowing the respective reception frequency.
  • the receiver By comparing the stored PI codes or the program reference numbers, the receiver sets the required reception frequency or the desired program. Under certain circumstances, a station search must be started to save the Pl codes the receiver "gets to know” the transmitters receivable in his area as well as their program reference numbers.
  • the radio receiver in FIG. 1 already has a very compact design in terms of circuit technology, since many modules are used together for both receiving parts. In individual cases, it is entirely conceivable to provide some modules separately for both receiver trains, but to use them together for both.
  • the decisive factor here is a common interface 22, via which control data as well as user data are routed from the DAB receiving section 23 to the FM receiving section and vice versa. Interface means in particular the inputs and outputs of both receiving parts and the corresponding lines between the inputs and outputs.
  • the FM-FM receiver 21 has an antenna 1 and loudspeaker 16 for playback and all circuit parts required for reception, processing and playback for analog audio signals.
  • the DAB receiver 23 connected to the VHF-FM receiver via an interface 22 has its own operating device, display and
  • the DAB receiver 23 can be connected directly to the antenna output via the interface 22. Furthermore, a bidirectional control line is provided in the interface, via which the first or second control signals are fed to the other receiver for the purpose of control. A common power supply of both receivers is also possible by means of the interface.
  • the NF signals at the output of the DAB-NF stage are directly via the interface supplied to the speakers 16.
  • the setting of the playback parameters such as volume, balance, stereo / mono, etc. is optionally possible with the operating devices of both receivers or one receiver.
  • the corresponding operating control signals from the DAB receiver are likewise fed to the VHF-FM receiver via the interface 22 and processed there.
  • the FM-FM receiver 20 like the receiving part 6, has an RDS decoder and an RDS signal processing circuit suitable for this. If a first control signal transmitted with an RDS signal is received, the DAB receiver is supplied with a switching pulse which switches the DAB receiver on and calls up the program point assigned to the current program received via FM-FM.
  • the 6 shows an FM-FM transmitter or an FM-FM transmitter arrangement 60 which has a transmitting antenna 61, an FM-FM modulator unit 62, a first control signal encoder 63 and a mixer 64 Data input 65, the transmitter signals 60 are supplied with the program signals P1 from a broadcasting studio (not shown).
  • the control signal encoder outputs the first control signal via an output 66 to an input 67 of the mixer 64, which mixes and modulates the first control signal with the radio broadcast signal from the FM-FM modulator unit 62.
  • the first control signal in the present example in the FM radio broadcast signal is a pilot carrier or an auxiliary frequency which is M times 19 kHz away from the carrier frequency. M is a natural number, for example four.
  • the mixed output signal of the mixer is emitted via the antenna 61 and can be received by an FM-FM receiver.
  • the first control signal is only transmitted if the current program P1 is also broadcast by the transmitter arrangement 60 or another transmitter Sn via digital radio DAB or DSR. Otherwise not.
  • the first control signal can be decoded on the receiving side in the radio receiver and one further processing as described above can be used to control a DAB receiver.
  • a transmission arrangement S2 (not shown) according to claim 17 can be constructed accordingly with a second control signal encoder for generating the second control signal, the second control signal or first characteristic data (see claim 8) being inserted as additional signals in the digital signal stream.
  • DAB provides for transmitting, preferably six, stereo programs interleaved in one another according to the COFDM method on a multiplicity of carrier frequencies.
  • the audio signals but also the program-accompanying signals from e.g. contain six programs.
  • Data bits which contain information about the number of programs transmitted in a COFDM multiplex frame are also preferably transmitted.
  • a program-accompanying signal is also the transmitter identifier or the transmitter name, e.g. NDR 2, FFN, etc., which can be shown on the display 10 as shown in FIG. 3.
  • a DAB receiver that receives a data frame then always receives six programs at the same time, of which only one is reproduced.
  • the display 10 of the DAB receiver always shows the names of all the transmitters that are transmitted in a data frame. As shown in FIG. 9, such a display significantly increases the clarity for setting the desired station.
  • the DAB receiver 5 or 23 can access each of the displayed programs without having to reset the reception frequency by calling up the corresponding program position of the data frame on which the program signals of the desired program are stored.
  • DOT matrix 9 has an individual control and is designed, for example, as a DOT matrix.
  • transmission channel e.g. VHF, AM, DSR etc.
  • a displayed program is otherwise to be received, provided that corresponding second control signals are also transmitted via the DAB transmission channel.
  • news, pop, culture, etc., sector information assigned to a transmitter can also be displayed if this is transmitted by the transmitter.
  • a suitable marking e.g. Font size change, bold font, background change etc. in the display field at the corresponding station name or a special marking of the button 40 assigned to this station name, e.g. by lighting up an LED arranged in the button.
  • a single-digit character per receivable transmitter can also be shown on the display, so that the display itself is compact in size and requires less space, as shown in FIG. 9.
  • buttons 40 can also be dispensed with if the display field has a "tip-in” function or is designed as a "touch screen", so that only one point in the display field has to be touched where the desired transmitter is located. After touching the display field at the point, a signal is transmitted to the control unit and the desired setting is made.
  • a display unit or display 10 as shown in FIG. 9 can be used for every DAB receiver, even if the second control signals are not transmitted and the receiver is not connected to an FM radio receiver.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

Système de radiodiffusion et récepteur de radiodiffusion pour radiodiffusion UHF-FM et radiodiffusion à codage numérique (DAB, DSR). L'invention a pour objet de créer un système de radiodiffusion polyvalent UHF-FM/AM <---> DAB, ainsi que des récepteurs de radiodiffusion correspondants. Système de radiodiffusion pour la radiodiffusion UHF-FM et/ou AM, avec lequel on transmet avec un signal radio UHF-FM et/ou AM un premier signal de commande qui est décodé avec un premier décodeur de signaux de commande dans un récepteur de radiodiffusion UHF-FM et/ou AM (6) et qui sert à mettre en marche et/ou à commander un récepteur de radiodiffusion (5) pour la radiodiffusion numérique (DAB, DSR). Récepteur de radiodiffusion avec une première partie de réception radio (1, 2, 6) pour la réception et le traitement de signaux UHF-FM et/ou AM, récepteur avec lequel cette première partie de réception radio (1, 2, 6) est reliée ou couplée électriquement à une deuxième partie de réception radio (1, 2, 5) pour la réception et le traitement de la radiodiffusion audio numérique (DAB, DSR) et avec lequel il est prévu pour les deux parties de réception radio un ou plusieurs éléments communs, tels qu'une antenne (1), un étage HF/FI (2), des éléments de contrôle (9), des haut-parleurs (16), une commande (3), une alimentation électrique, des décodeurs supplémentaires de données, etc.. Récepteurs de radiodiffusion, en particulier récepteurs combinés UHF-FM/DAB et récepteurs de télévison MAC/PAL.
EP92922255A 1991-11-01 1992-10-26 Systeme de radiodiffusion et recepteur de radiodiffusion Expired - Lifetime EP0610313B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4136068A DE4136068A1 (de) 1991-11-01 1991-11-01 Rundfunkuebertragungssystem und rundfunkempfaenger fuer ukw-fm und digitalen rundfunk (dab)
DE4136068 1991-11-01
DE4139264 1991-11-29
DE4139264 1991-11-29
PCT/EP1992/002448 WO1993009615A1 (fr) 1991-11-01 1992-10-26 Systeme de radiodiffusion et recepteur de radiodiffusion

Publications (2)

Publication Number Publication Date
EP0610313A1 true EP0610313A1 (fr) 1994-08-17
EP0610313B1 EP0610313B1 (fr) 1998-02-04

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US (1) US5584051A (fr)
EP (1) EP0610313B1 (fr)
JP (1) JP3520307B2 (fr)
KR (1) KR100255884B1 (fr)
CN (1) CN1052594C (fr)
AT (1) ATE163114T1 (fr)
AU (1) AU2892492A (fr)
DE (1) DE59209190D1 (fr)
ES (1) ES2113959T3 (fr)
TW (1) TW213525B (fr)
WO (1) WO1993009615A1 (fr)

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JPH07500710A (ja) 1995-01-19
AU2892492A (en) 1993-06-07
WO1993009615A1 (fr) 1993-05-13
KR100255884B1 (ko) 2000-05-01
US5584051A (en) 1996-12-10
CN1072300A (zh) 1993-05-19
ES2113959T3 (es) 1998-05-16
JP3520307B2 (ja) 2004-04-19
DE59209190D1 (de) 1998-03-12
TW213525B (fr) 1993-09-21
CN1052594C (zh) 2000-05-17
ATE163114T1 (de) 1998-02-15
EP0610313B1 (fr) 1998-02-04

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