EP0793361A1 - Circuit pour décoder des informations supplémentaires dans une transmission de radiodiffusion - Google Patents

Circuit pour décoder des informations supplémentaires dans une transmission de radiodiffusion Download PDF

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Publication number
EP0793361A1
EP0793361A1 EP96102902A EP96102902A EP0793361A1 EP 0793361 A1 EP0793361 A1 EP 0793361A1 EP 96102902 A EP96102902 A EP 96102902A EP 96102902 A EP96102902 A EP 96102902A EP 0793361 A1 EP0793361 A1 EP 0793361A1
Authority
EP
European Patent Office
Prior art keywords
signal
value
additional information
filter
signal quality
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
EP96102902A
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German (de)
English (en)
Other versions
EP0793361B1 (fr
Inventor
Thomas Dipl.-Ing. Hilpert
Stefan Dipl.-Ing. Müller
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.)
TDK Micronas GmbH
Original Assignee
Deutsche ITT Industries 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
Application filed by Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
Priority to DE59611437T priority Critical patent/DE59611437D1/de
Priority to EP96102902A priority patent/EP0793361B1/fr
Priority to US08/805,767 priority patent/US5978037A/en
Publication of EP0793361A1 publication Critical patent/EP0793361A1/fr
Application granted granted Critical
Publication of EP0793361B1 publication Critical patent/EP0793361B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • 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

Definitions

  • the invention relates to a circuit for decoding additional information in a signal mixture.
  • Such circuits are used to obtain additional information from the signals received in the audio or video consumer area.
  • this is auxiliary information that allows the user to operate the respective receiving device more easily.
  • the identification of a received transmitter as a car information transmitter is an important indicator for the motorist.
  • Similar additional information is also available for television signals which also transmit a digital identification for audio reproduction, whether the respective audio channel is a mono, stereo or multi-tone signal acts.
  • this information is additionally inserted into the existing signal mixture as an AM or FM signal.
  • the decoding of this additional information is usually simple and easy to implement with known analog or after an analog / digital conversion with digital circuits. There are also difficulties with the rapid change and the constant introduction of such additional information, because under certain circumstances the switchover controlled by the additional information is very disturbed by adjacent channels and poor reception conditions and lead to incorrect evaluations of the additional information.
  • the signal quality parameter which is a measure of the quality of the received signal, can be determined at various points in the signal mixture. Of course, this depends on the type of signal mix. Digital processing has the advantage that the signals are usually present as normalized signals, the value range of which lies within the numerical values -1 and +1. Such a quality value can then be easily determined via the defined levels of the carriers and their noise-related amplitude fluctuations.
  • a level measurement in this area can advantageously be used to determine the general noise or a disturbing external signal.
  • Such signal areas can be found in particular in the indicated signal mixtures of the consumer area, because for reasons of compatibility the individual signal areas usually do not overlap.
  • the additional information is coupled to different carriers, which is so in the frequency spectrum are arranged so that their modulation ranges do not overlap.
  • the intermediate areas there should be no signal with a proper signal or good reception conditions.
  • the improved evaluation of the additional information with the signal quality characteristic has the advantage that the filter effort can remain relatively low.
  • the increased security when evaluating the disturbed additional information does not result from a higher quality of the filters. This is possible because, as it were, the interference component and not the useful signal component is recorded and evaluated.
  • the determination of a relatively high interference component - a low interference component is of no interest because it does not cause incorrect decoding - generally does not require any narrow-band filters for the signals present.
  • Simple notch filters or bandpass filters are therefore suitable for masking out the useful signal area, the blocking area of which is placed in such a way that the respective useful or additional signal is largely suppressed.
  • FIG. 1 shows a receiving device 10 for a mixed signal sf ', which is a stereo multiplex signal for the exemplary embodiment.
  • the conversion of the high-frequency transmitted signal mixture into the baseband takes place in the receiving device 10, which is shown schematically in FIG. 2 for the example given.
  • the signal mixture sf in the baseband is digitized and is fed to a signal processing device 20 for sound signals, which generates the desired output signals R, L via further mixers 22 and sound processing stages 24.
  • the signals sf are also fed to a mixer device 32 with which the additional information fz in the signal mixture sf is converted into a lower frequency position, in particular into a baseband position.
  • the individual components ki can be separated from one another by means of simple filter devices 35, 36, 37.
  • the separated components ki are then fed to a decoding device 40 in order to form the individual identification signals kz, for example a mono / stereo switchover signal u or an ARI identification signal (auto radio information), which is supplied to the sound processing stage 24 or the receiving device 10.
  • a decoding device 40 in order to form the individual identification signals kz, for example a mono / stereo switchover signal u or an ARI identification signal (auto radio information), which is supplied to the sound processing stage 24 or the receiving device 10.
  • the processing frequencies are first reduced by means of decimation devices in order to reduce the circuit complexity for the filters.
  • a signal-free frequency section is also detected from the signal fz by means of a bandpass 38 in order to determine a signal quality characteristic kg by means of a device 50.
  • This signal quality parameter kg is fed to the decoding device 40, which can thereby adaptively adapt to the respective reception conditions.
  • FIG. 2 shows the frequency scheme of a stereo multiplex signal sf which contains an auxiliary carrier at 57 kHz which is modulated with additional information fz, for example an ARI identification signal. whereby the automatic stereo switching is less disturbed.
  • the signal mixture sf (cf. FIG. 4) relates to a standardized television signal with a first and second sound carrier FM1, FM2, the sound carrier FM2 containing additional information fz 'about an AM modulation. Since the additional information fz 'is in the area of the carrier FM2, the preceding processing stages for pre-filtering and frequency conversion are not shown in FIG. 3 for the sake of a better overview, but instead a source 310 for this preprocessed signal fz' is specified in the preprocessing device 300.
  • the carrier FM2 is therefore no longer at the frequency 54 kHz, but at a lower frequency, for example between 8 kHz and 10 kHz.
  • the video signal, the R + L signal on the carrier FM1 and the R signal on the carrier FM2 are no longer present or only as residues.
  • the output signal fz 'of the source 310 therefore only contains the carrier FM2 and, if appropriate, an upper and lower sideband, a frequency line k1 at a distance of 171.5 Hz or a frequency line k2 at a distance of 274.1 Hz. With these two Frequency lines are coded as to whether the respective audio channel contains a stereo or bilingual signal.
  • the source 310 is followed by a preprocessing device 320 for the additional information area fb (cf. FIG. 4), which essentially contains a decimation device with a decimation filter. Possible DC voltage components are suppressed by a DC voltage suppression circuit 330.
  • the filtered additional signal fz is fed to an adaptive decoding device 400, the output of which supplies the desired identification signals M, S, B for mono, stereo or bilingual operation.
  • the input of the adaptive decoding device 400 contains an absolute value generator 405 serving as a signal rectifier for demodulating the AM-modulated signal fz, followed by a decimation stage 410, with which the clock frequency is reduced from 32 kHz to 2 kHz.
  • the amplitude of the signal k1 at 171 Hz is determined by means of a bandpass filter 415 and an absolute value generator 420 and fed to the minus input of a subtractor 425.
  • the amplitude of the signal k2 at 274 Hz is determined by means of a bandpass 430 and an absolute value generator 435 and is fed to the subtrahend input of the subtractor 425.
  • a resulting characteristic value ka is formed from the difference by means of a low pass 440.
  • the desired identification signals kz or M, S, B could be determined from this characteristic value ka via appropriate switching thresholds, as in the case of a non-adaptive decoding device.
  • a range of values from +0.2 to +1 would correspond to the stereo identification signal S, a range from -0.2 to +0.2 to the mono identification signal M and a range from -1 to -0.2 to the bilingual identification signal B.
  • the resulting characteristic value ka is modified by means of the signal quality characteristic value kg.
  • the switching thresholds for the modified characteristic value km are specified by a threshold value detection circuit 445, the threshold value position being able to be identical to the non-adaptive circuit.
  • the additional circuit 500 contains in its input a bandpass filter 550 which is fed with the filtered additional signal fz.
  • the middle position of this filter is expediently chosen such that the lower selection edge does not or only slightly detects the carrier FM2 with the first or second identification signal k1, k2, cf. Fig. 5.
  • the frequency components above should be allowed through without attenuation if possible.
  • the preceding filter 320 must therefore not come too close to the carrier FM2 with its upper selection edge, because otherwise the filter 320 already suppresses these frequencies and the bandpass filter 550 no longer finds a frequency range to be evaluated.
  • the noise or interference signal components at the output of the bandpass 550 are rectified by means of a squarer 555.
  • the squaring also causes one Weighting of the measured signal values.
  • a low-pass filter 560 smoothes the signal curve and by means of a decimation device 565 the clock frequency is reduced from 32 kHz to 2 kHz.
  • the output signal of the decimation device 565 corresponds to an interference characteristic value ks lying between the values 0 and +1, which increases or decreases in parallel with the measured interference content.
  • the signal quality parameter kg is formed from this value ks by means of a subtractor 570 by subtracting the interference parameter ks from the numerical value +1.
  • the adaptive effect of the signal quality characteristic value kg on the original characteristic value ka takes place by means of a multiplier 575, the output signal of which is a modified or adaptive characteristic value km, which supplies the desired identification signals kz or M, S, B by means of the threshold value detection device 445.
  • the signal quality parameter kg assumes the value +1, as a result of which the original parameter ka is not changed. However, if the noise component in the filtered additional signal fz increases, the signal quality parameter kg becomes smaller and drops, for example, to the value 0.5. The value of the original characteristic values ka is thereby halved, which increases the tendency for the mono identification signal M. Individual signal outliers that are caused by noise or external signals are thus prevented - for example in mono operation or when receiving a signal without the carrier FM2 - from incorrectly switching the receiver. This is particularly important for safe mono operation when the received signal contains neither a stereo nor a bilingual signal. As a result of the invention, in the event of unsafe reception conditions, however, an automatic switchover is only possible with clear identification signals k1, k2 or ka.
  • the digital low pass 560 may also include non-linear stages or counters that are charged or discharged differently to further improve noise suppression. It is pointed out that the exemplary embodiment of FIG. 3 represents only an advantageous exemplary embodiment of the invention. Advantageous further developments of individual functional units or entire functional groups are at the discretion of the person skilled in the art.
  • the frequency-modulated audio signal range with the first carrier FM1 at 5.5 MHz follows the video signal range from 0 Hz to approx. 5 MHz.
  • the R + L signal which also represents the mono signal, is transmitted in this area.
  • this area contains the first tone signal.
  • the second carrier FM2 which contains the 2R signal or the second audio signal in frequency modulation.
  • the R + L signal is formed from the R + L signal and the 2R signal by means of a stereo matrix.
  • the additional identifier relating to the mono, stereo or multi-tone operation is superimposed on the carrier FM2 by means of the very low-frequency and therefore inaudible amplitude modulation described several times.
  • the frequency scheme of the signal fz after the preprocessing device 300 is shown schematically in FIG. 5. So that digital signal processing at 32 kHz can be carried out, the FM2 carrier has been converted in stage 300 from 54 kHz to 9 kHz. The signal fz no longer contains any sound information, but only the possibly FM FM modulated. The upper and lower sidebands contain either the frequency line k1 or the frequency line k2. As indicated, both are close to the carrier FM2.
  • the signal area fb separated in the preprocessing device 300 which is to contain the additional information fz and a signal-free area of the signal mixture sf, is shown schematically.
  • the associated pass band of the bandpass filter 550 is shown schematically by the broken line 550, which essentially covers the signal-free area in the separated signal area fb. It is irrelevant if a small portion of the carrier FM2 is also included. It is also irrelevant how far the passband exceeds the separated signal range fb if it is ensured that there are no more signal components there. As a result, the requirements for the filter 550 are very low and it is easy to implement with digital means.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Stereo-Broadcasting Methods (AREA)
EP96102902A 1996-02-27 1996-02-27 Circuit pour décoder des informations supplémentaires dans une transmission de radiodiffusion Expired - Lifetime EP0793361B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59611437T DE59611437D1 (de) 1996-02-27 1996-02-27 Schaltung zur Dekodierung einer Zusatzinformation in einer Rundfunkübertragung
EP96102902A EP0793361B1 (fr) 1996-02-27 1996-02-27 Circuit pour décoder des informations supplémentaires dans une transmission de radiodiffusion
US08/805,767 US5978037A (en) 1996-02-27 1997-02-25 Circuit for decoding additional information in a composite signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96102902A EP0793361B1 (fr) 1996-02-27 1996-02-27 Circuit pour décoder des informations supplémentaires dans une transmission de radiodiffusion

Publications (2)

Publication Number Publication Date
EP0793361A1 true EP0793361A1 (fr) 1997-09-03
EP0793361B1 EP0793361B1 (fr) 2007-07-11

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EP96102902A Expired - Lifetime EP0793361B1 (fr) 1996-02-27 1996-02-27 Circuit pour décoder des informations supplémentaires dans une transmission de radiodiffusion

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US (1) US5978037A (fr)
EP (1) EP0793361B1 (fr)
DE (1) DE59611437D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7552458B1 (en) 1999-03-29 2009-06-23 The Directv Group, Inc. Method and apparatus for transmission receipt and display of advertisements
US7877290B1 (en) 1999-03-29 2011-01-25 The Directv Group, Inc. System and method for transmitting, receiving and displaying advertisements
EP1158706A1 (fr) * 2000-05-23 2001-11-28 Sony International (Europe) GmbH Décodeur RDS pour réduire l'influence de pointes de bruit en utilisant un dispositif d'élimination de bruit
US7085529B1 (en) 2001-10-24 2006-08-01 The Directv Group, Inc. Method and apparatus for determining a direct-to-home satellite receiver multi-switch type
JP4859412B2 (ja) * 2005-08-26 2012-01-25 クラリオン株式会社 ディジタル放送受信装置、ディジタル放送受信方法、およびプログラム
US8775319B2 (en) 2006-05-15 2014-07-08 The Directv Group, Inc. Secure content transfer systems and methods to operate the same
US8687947B2 (en) 2012-02-20 2014-04-01 Rr Donnelley & Sons Company Systems and methods for variable video production, distribution and presentation
US8826316B2 (en) 2012-10-22 2014-09-02 The Nielsen Company (Us), Llc Systems and methods for configuring media devices utilizing audio codes or signatures

Citations (4)

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Publication number Priority date Publication date Assignee Title
WO1985003824A1 (fr) * 1984-02-16 1985-08-29 Ma John Yoh Han Systeme de transmission de sous-porteuse a modulation de frequence
EP0374996A1 (fr) * 1988-12-01 1990-06-27 Koninklijke Philips Electronics N.V. Récepteur FM
EP0653857A1 (fr) * 1993-11-13 1995-05-17 Nokia Mobile Phones Ltd. Détection d'un signal de radiomessagerie dans une transmission radiophonique a modulation de fréquence
FR2716056A1 (fr) * 1994-02-04 1995-08-11 Aztec Assistance Technologique Dispositif de réception et de restitution d'informations et/ou de données transmises par l'intermédiaire d'un signal radiophonique et procédé mettant en Óoeuvre un tel dispositif.

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EP0512133B1 (fr) * 1991-05-03 1997-01-02 Deutsche ITT Industries GmbH Procédé d'accord automatique par balayage de porteuses son pour télévision par satellites
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003824A1 (fr) * 1984-02-16 1985-08-29 Ma John Yoh Han Systeme de transmission de sous-porteuse a modulation de frequence
EP0374996A1 (fr) * 1988-12-01 1990-06-27 Koninklijke Philips Electronics N.V. Récepteur FM
EP0653857A1 (fr) * 1993-11-13 1995-05-17 Nokia Mobile Phones Ltd. Détection d'un signal de radiomessagerie dans une transmission radiophonique a modulation de fréquence
FR2716056A1 (fr) * 1994-02-04 1995-08-11 Aztec Assistance Technologique Dispositif de réception et de restitution d'informations et/ou de données transmises par l'intermédiaire d'un signal radiophonique et procédé mettant en Óoeuvre un tel dispositif.

Also Published As

Publication number Publication date
DE59611437D1 (de) 2007-08-23
EP0793361B1 (fr) 2007-07-11
US5978037A (en) 1999-11-02

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