EP2139133A2 - Dispositif et procédé destinés à l'adaptation du spectre de reproduction de deux sources audio - Google Patents

Dispositif et procédé destinés à l'adaptation du spectre de reproduction de deux sources audio Download PDF

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Publication number
EP2139133A2
EP2139133A2 EP20090100254 EP09100254A EP2139133A2 EP 2139133 A2 EP2139133 A2 EP 2139133A2 EP 20090100254 EP20090100254 EP 20090100254 EP 09100254 A EP09100254 A EP 09100254A EP 2139133 A2 EP2139133 A2 EP 2139133A2
Authority
EP
European Patent Office
Prior art keywords
transfer function
audio source
spectrum
audio
radio receiver
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.)
Withdrawn
Application number
EP20090100254
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German (de)
English (en)
Other versions
EP2139133A3 (fr
Inventor
Stefan Rychlak
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2139133A2 publication Critical patent/EP2139133A2/fr
Publication of EP2139133A3 publication Critical patent/EP2139133A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/26—Arrangements for switching distribution systems

Definitions

  • the invention relates to a device for adapting the reproducible spectrum of two audio sources, comprising an adaptive filter having a first and a second input and an output, wherein a first transfer function for reproducing the first audio source at the first input and a second transfer function for reproducing the second audio source is provided at the second input.
  • Devices of the type mentioned are used in particular to play different audio sources with the same program content alternately, with no noticeable switching effects should occur for the listener.
  • variable filter stages as a tone control, by means of which the user can raise or lower individual frequency ranges of the input signal in order to adapt the signal to his listening habits and his personal preferences.
  • the signal of the first audio source and the signal of the second audio source are different bandwidth, i. have a different frequency spectrum, results due to the changing in the switching of the transmission path input signal despite the sound adjustment by the user a different sound impression. The user must compensate for this difference after switching so by manually operating the tone controls again.
  • the invention is therefore based on the object to make the remaining prior art switching effects as far as possible inaudible to the user the task.
  • a device for adjusting the reproducible spectrum of two audio sources comprising an adaptive filter having a first and a second input and an output, wherein a first transfer function for reproducing the first audio source at the first input and a second transfer function for playback the second audio source is provided at the second input, wherein the first transfer function is adjustable by the user, and the second transfer function is automatically determined, so that the playback spectrum at the output of the adaptive filter is the same for both audio sources.
  • the object is achieved in a method for switching two audio sources of the same program content, in which an adaptive filter with a first transfer function for reproducing the first audio source and a second transfer function of the second audio source is used to the playback spectrum at the output of the adaptive filter for both To equalize audio sources, wherein the first transfer function is set by the user and the second transfer function is determined automatically.
  • the invention proposes to provide a filter with variable transmission behavior for individual sound adjustment by the user. This allows the user to customize the playback to their individual needs. After the switching of the audio signal, for example, from an analog radio receiver to a digital radio receiver or vice versa results in a different output signal due to the different bandwidth of both signal sources with unchanged filter function. In the prior art, the user would have to make the sound settings again, i. change the transfer function of the filter to replay according to its individual preferences.
  • a virtually unchanged or equal reproduction spectrum in the sense of the present invention is understood to mean a reproduction spectrum which causes the same sound impression to the user or listener. This does not exclude that two reproduction spectra have partly different signal intensities in one or more frequency bands, if these differences are not perceived by the user, for example due to psychoacoustic effects or due to the inaudibility of frequencies at the edge of the reproduction spectrum.
  • a first and a second transfer function store in a storage device for each broadcast program, a first and a second transfer function store in a storage device. If the user makes no changes to the sound settings when the corresponding broadcast program is called up, the program can be played back immediately with the stored transfer function and thus with the sound settings preferred by the user.
  • the radio receiver with the inventive device selects depending on the input signal, for example, as a function of a digital or an analog transmission path, the appropriate transfer function.
  • the two audio sources 1 and 2 comprise two broadcast receiving parts, for example, an analog broadcast receiver 1 and a digital broadcast receiver 2.
  • Each broadcast receiver is provided with an antenna for receiving a broadcast signal intended for it.
  • both audio signals are available at two inputs of an adaptive filter 3.
  • the adaptive filter 3 can be constructed as an analog or digital filter.
  • An analog filter can be constructed as a passive filter consisting of resistors, capacitors and inductors.
  • An active analog filter may have filter stages, for example, which operate with at least one operational amplifier.
  • a digital filter can be realized by means of a digital signal processor or a microprocessor, which executes a corresponding software, which represents the desired filter characteristic.
  • the adaptive filter 3 has a conformance memory 30 and 31 at each input.
  • the conformity memory is used for buffering the input signals of the audio sources 1 and 2, for example in the form of a FIFO stack.
  • the data read from the conformity memory 30 are convolved with a filter function 32. This can be done either in the form of analog or digital filtering, for example with a digital signal processor. In FIG. 1 In this case, the situation is shown that the data arrive at the output of the filter 32 via a changeover switch 34 to the output of the adaptive filter 3.
  • the transfer function 32 of the first signal path can be set by the user via a user interface 6.
  • the user may individually raise or lower individual frequency bands such as bass, mid or high according to his preferences.
  • the transfer function 32 changes the sound spectrum of the input signal of the first audio source 1 at the output of the adaptive filter 3. This output signal is subsequently supplied to a signal amplifier 4. The signal amplified in the signal amplifier 4 is then reproduced via at least one loudspeaker 5.
  • FIG. 1 For clarity, is in FIG. 1 only one signal amplifier with a loudspeaker darg Robinson. It will be understood by those skilled in the art that multiple signal amplifiers and multiple speakers may be used for playback, for example for stereo playback or to use separate loudspeakers for the bass, midrange and treble ranges.
  • the arithmetic unit 7 analyzes the reproduction spectrum at the output of the transfer filter 3. This can be done for example by means of a Fourier or a wavelet transformation.
  • the arithmetic unit 7 contains, for example, a semiconductor memory and / or a digital signal processor and / or a microprocessor and / or a microcontroller and corresponding software.
  • the input signal of the second audio source 2 is analyzed.
  • the arithmetic unit 7 reads data from the audio source 2 from the conformity memory 31.
  • the arithmetic unit 7 determines from the differences of the respective signal spectra a transfer function 33 which is suitable for converting the signal of the second audio source 2 into the reproduction spectrum.
  • the transfer function 33 is thus used to reproduce the nominal content-identical audio signal of the audio source 2 in such a way that the same playback spectrum is available at the output of the adaptive filter 3 even with different input spectra of the audio sources 1 and 2.
  • the arithmetic unit 7 may also comprise a unit known per se in order to equalize the volume and / or a time offset between the signals of the audio sources 1 and 2.
  • both transfer functions 32 and 33 can be stored in an in FIG. 1 Memory not shown are stored. Together with the transfer functions 32 and 33, an identifier is generated and stored, which assigns the transfer functions 32 and 33 to a specific radio program. In a development of the invention, further information can also be stored in the memory, for example a time offset between audio sources with a nominally identical program content.
  • the switch 34 can either automatically switch from the first to the second audio source, for example from a digital radio receiver to an analog radio receiver, if the signal of the currently not reproduced audio source better reception, i. promises a better sound impression. Alternatively, the switching can also be done manually by an intervention of the user.
  • the structure of the adaptive filter 3 can be provided to make the structure of the adaptive filter 3 symmetric, d. H. also let the user specify the transfer function 33 by means of the user interface 6 and instead to automatically generate the transfer function 32 as described above.
  • FIG. 2 shows a flow chart of the proposed method according to the invention.
  • both the first and the second audio signal are buffered in a conformity memory 2.
  • the buffering preferably comprises a data amount which allows playback for about 0.5 to 15 seconds.
  • the buffering of the audio signals takes place in the form of digital signals.
  • a playback source Upon completion of caching, a playback source is automatically selected. Since both the first and the second audio signal transmit the same program content, the selection of the playback source is based on the quality of the audio signals. For example, if the signal voltage of an analog received audio signal is very low, a digital audio signal is preferred selected. If a digital audio signal can only be transmitted with a high bit error rate, an analog audio signal is preferably selected.
  • the audio signal of the selected audio source is reproduced without the use of a transfer function. Playback now takes place with the sound settings provided by the transmitter or a default setting of the first transfer function.
  • the setting of the transfer function comprises in particular the lowering or raising of selectable frequency ranges of the audio signal. After completion of the setting of the first transfer function by the user, this first transfer function is stored in a storage device.
  • the setting of the transfer function by the user is not mandatory, but the user can be satisfied with the sound settings provided by the transmitter or the default setting stored in the radio receiver.
  • the first transfer function may be a constant function that does not change the audio signal provided by the first audio source.
  • the first audio source is played using the user-selected first transfer function.
  • the transfer function thereby changes the spectrum of the input signal to a reproduction spectrum, for example by folding the input signal with the transfer function.
  • the playback spectrum is now analyzed by means of an arithmetic unit, for example by means of a digital signal processor. Furthermore, the spectrum of the input signal supplied by the non-selected signal source is analyzed in the same way. In the illustrated embodiment, this is the second audio signal.
  • the analysis can be carried out, for example, by a Fourier transformation, a Hilbert transformation or a wavelet transformation of the audio signals.
  • a transfer function is now calculated, which converts the spectrum of the non-selected signal source into the reproduction spectrum. If the spectrum of the input signal of the first audio source and the second audio source is identical, an identity of the first and the second transfer function also results. If the spectrum of both audio sources is not identical, there are differences in the transfer functions, which convert these different input spectra into an identical reproduction spectrum.
  • the first transfer function is stored together with the second transfer function and an identifier characterizing the program content.
  • the transfer functions which map the individual listening habits of the user while eliminating the tonal differences of the audio sources, are available for future use. Only when a transfer function is changed by a user intervention, a second transfer function is automatically calculated again, which also maps these changes.
  • both the audio source and the associated transfer function are changed so as to enable a reproduction with an identical reproduction spectrum.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP09100254.3A 2008-06-26 2009-04-29 Dispositif et procédé destinés à l'adaptation du spectre de reproduction de deux sources audio Withdrawn EP2139133A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810002689 DE102008002689A1 (de) 2008-06-26 2008-06-26 Vorrichtung und Verfahren zur Anpassung des Widergabespektrums zweier Audioquellen

Publications (2)

Publication Number Publication Date
EP2139133A2 true EP2139133A2 (fr) 2009-12-30
EP2139133A3 EP2139133A3 (fr) 2015-03-04

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EP09100254.3A Withdrawn EP2139133A3 (fr) 2008-06-26 2009-04-29 Dispositif et procédé destinés à l'adaptation du spectre de reproduction de deux sources audio

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EP (1) EP2139133A3 (fr)
CN (1) CN101615959B (fr)
DE (1) DE102008002689A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3001418A1 (fr) * 2014-08-12 2016-03-30 Nxp B.V. Article manufacturé, système et support de stockage lisible par ordinateur pour traiter des signaux audio

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10103400A1 (de) 2001-01-26 2002-08-14 Bosch Gmbh Robert Verfahren zur Audioserviceumschaltung bei einem Rundfunkempfänger

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3526225B2 (ja) * 1998-11-04 2004-05-10 シャープ株式会社 デジタル放送受信装置
DE60203789T2 (de) * 2002-06-07 2006-03-09 Sony International (Europe) Gmbh Verfahren und Vorrichtung zum Empfang eines gleichzeitig in analoger und digitaler Modulation übertragenen Audiosignales, mit allmählicher Umblendung von digital auf analog bei schlechter Kanalgüte, um den Wechsel weniger wahrnehmbar zu machen
US20060153405A1 (en) * 2005-01-13 2006-07-13 Myers Bruce A Audio automatic volume control
US7944998B2 (en) * 2006-06-16 2011-05-17 Harman International Industries, Incorporated Audio correlation system for high definition radio blending

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10103400A1 (de) 2001-01-26 2002-08-14 Bosch Gmbh Robert Verfahren zur Audioserviceumschaltung bei einem Rundfunkempfänger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3001418A1 (fr) * 2014-08-12 2016-03-30 Nxp B.V. Article manufacturé, système et support de stockage lisible par ordinateur pour traiter des signaux audio
US9384745B2 (en) 2014-08-12 2016-07-05 Nxp B.V. Article of manufacture, system and computer-readable storage medium for processing audio signals

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Publication number Publication date
CN101615959A (zh) 2009-12-30
DE102008002689A1 (de) 2009-12-31
CN101615959B (zh) 2013-06-12
EP2139133A3 (fr) 2015-03-04

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