EP0714222A2 - Processeur de signaux pseudostéréo pour récepteur mobile - Google Patents

Processeur de signaux pseudostéréo pour récepteur mobile Download PDF

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Publication number
EP0714222A2
EP0714222A2 EP95118291A EP95118291A EP0714222A2 EP 0714222 A2 EP0714222 A2 EP 0714222A2 EP 95118291 A EP95118291 A EP 95118291A EP 95118291 A EP95118291 A EP 95118291A EP 0714222 A2 EP0714222 A2 EP 0714222A2
Authority
EP
European Patent Office
Prior art keywords
stereo
signal
pseudo
circuit
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.)
Granted
Application number
EP95118291A
Other languages
German (de)
English (en)
Other versions
EP0714222A3 (fr
EP0714222B1 (fr
Inventor
Herbert Hetzel
Harald Schöpp
Christoph Benz
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.)
Harman Becker Automotive Systems GmbH
Original Assignee
Becker 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 Becker GmbH filed Critical Becker GmbH
Publication of EP0714222A2 publication Critical patent/EP0714222A2/fr
Publication of EP0714222A3 publication Critical patent/EP0714222A3/fr
Application granted granted Critical
Publication of EP0714222B1 publication Critical patent/EP0714222B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution

Definitions

  • the invention relates to a mobile radio receiver according to the preamble of claim 1.
  • mobile radio devices are known in a variety of designs. As far as stereo receivers are concerned, they show a switch from stereo mode to mono mode if the reception quality decreases. Mono operation does not sufficiently satisfy the listener's sense of sound. Almost every mobile radio receiver has the option of manually adjusting the sound parameters such as height, bass, balance or fader in mono operation, but these variation options do not create the possibility of a sufficient sound experience comparable to that of stereo reception, especially since these settings unsatisfactorily make the driver of a radio listening Way distracts from traffic.
  • the invention is based on the object of creating a mobile radio receiver which offers the user a sound experience close to that of stereo reception even under difficult reception conditions without complex operation.
  • a mobile radio receiver of the type mentioned it is proposed to provide it with a pseudo-stereo circuit, which ensures that automatically when a mono signal is present, it is converted into a pseudo-stereo signal and thereby a user particularly pleasant feeling of sound is conveyed.
  • the pseudo-stereo circuit is always active as soon as the mobile radio receiver is not able to receive a stereo signal of sufficient quality due to the broadcast radio signal or due to the current local reception conditions, which leads to an automatic switchover from stereo to Mono reception of the radio receiver leads.
  • the unpleasant sound experience of the flat mono signal is automatically upgraded to a pleasant spatial and full sound experience due to the pseudo-stereo sound, i.e. without complex adjustments, which are associated with a dangerous reduction in the driver's attention to traffic.
  • the radio receiver is already switched to mono operation if the stereo reception situation is still possible, which automatically leads to a pseudo stereo signal without the driver having to influence the driver to use the pseudo stereo circuit and thus to process the mono signal.
  • the limit value is chosen so that reception that is always interference-free, in particular overlay-free, is reliably possible. It is possible to select the limit value in each case adapted to the area of application of the mobile radio receiver.
  • a switchover unit is preferably provided which, controlled by the quality of the received signal, switches in a defined manner between the stereo signal and the pseudo-stereo signal which was formed by the pseudo-stereo circuit from the received mono signal.
  • An alternative embodiment of the invention shows the switching process in the form of a cross-fade, which is completed within a period of the order of a second.
  • the cross-fading takes place continuously and not abruptly, which gives the listener the opportunity to get used to the changed sound conditions and thus achieve a pleasant switch from one sound state to the other.
  • This soft crossfading thus represents an optimized and very pleasant form of switching for the listener.
  • An advantageous embodiment of the invention results from the combination of the two different switching principles in that the transition from stereo to pseudo-stereo reception uses cross-fading and the transition from pseudo-stereo to stereo reception takes place in less than 100 ms .
  • this special form it is possible to slowly get the listener used to the poorer pseudo-stereo experience, which results in the usual unobtrusive and therefore very pleasant transition to the poorer sound image.
  • the fast, hard type of switching from poorer to better stereo reception is specifically chosen, since here the advantage of stereo reception comes into its own with a sufficiently advantageous sound experience during switching.
  • This combination thus enables the apparently reluctant switching principles to be combined to form a particularly advantageous overall device, which enables the radio receiver to be switched from stereo to pseudo-stereo reception in a sound-optimized manner.
  • the changeover process is preferably carried out according to a predetermined changeover characteristic.
  • the switchover characteristic is selected so that the listener perceives a switch from one to the other state as pleasantly as possible. Examples of suitable characteristic curve forms are, without being restricted to these, linear courses or such third degree.
  • a circuit for recognizing speech shows a special design of the radio receiver according to the invention. This detects speech components in the received or demodulated signal and controls the pseudo-stereo circuit in the presence of speech in such a way that the processing of the mono signal into a pseudo-stereo signal is prevented.
  • This training makes it possible to make speech signals particularly clear to the listener. Surprisingly, processing the mono signal into a pseudo-stereo signal is not advantageous for speech, because the intelligibility of the speech signal suffers, which is of central importance. Behind it must be the feeling of sound. Through this training, the user succeeds in important information, such as e.g. To receive traffic announcements or alarm messages in a particularly understandable form without at the same time foregoing the special sound sensation in music or the like.
  • the radio signal is statistically evaluated for the temporal and frequency characteristics in the circuit for recognizing speech. Based on the evaluation, a reliable statement can be made as to whether the signal is speech or other signals.
  • the RDS signal is evaluated by an RDS decoder for the PTY signal (Program Type Signal). If the evaluation shows that the PTY signal is a speech signal, the pseudo stereo circuit is deactivated. A corresponding arrangement results when a traffic announcement - a voice signal - is recognized by a traffic announcement decoder, which is known in large numbers, and the pseudo-stereo circuit is likewise deactivated by this.
  • the pseudo-stereo circuit is formed by two circuits, one for the left and one for the right channel. Both circuits are designed accordingly.
  • One circuit contains a delay element to which on the one hand the input signal and on the other hand the delayed signal amplified and fed back by a factor g is supplied.
  • the signal delayed in the delay element by the time del is subsequently amplified again by the factor -g before it is fed to the output for this channel in conjunction with the input signal.
  • the structure of the other circuit for the other channel corresponds to that of the former, whereby it should be noted that the factor -g and vice versa is set instead of the gain factor g.
  • This simple type of pseudo-stereo circuit makes it possible to generate a spatial sense of sound close to the stereo signal in a relatively simple manner.
  • the mono signal is fed to a delay element, which delays it by the time del.
  • This signal is then amplified in an amplifier stage by the amplification factor g, which is between 0 and 1.
  • the linked signals then form the output signals for the left or right channel.
  • This further simplified circuit shows, with comparable spatial resolution, due to the increased use of common components for the two circuits, less circuit complexity, which is reflected in less susceptibility and lower costs.
  • the time del and / or the factors g are selected so that the user experiences an optimized surround sound in each specific vehicle.
  • 2 and 3 show two alternatives for the basic structure of pseudo stereo circuits.
  • the mono signal is supplied.
  • this is combined with a signal delayed by a delay element by the time del and amplified by an amplifier stage by g or -g, which in turn is fed to the delay element.
  • the delayed signal is subsequently amplified in a second amplifier stage by the factor -g or g, in turn linked to the mono signal and fed to the right or left output channel of the pseudo-stereo circuit.
  • the mono signal is delayed in a delay element common to both circuits by the time del and amplified in a common amplifier stage by the factor g, which is between 0 and 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
EP95118291A 1994-11-26 1995-11-21 Processeur de signaux pseudostéréo pour récepteur mobile Expired - Lifetime EP0714222B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4442147A DE4442147C2 (de) 1994-11-26 1994-11-26 Mobiler Rundfunkempfänger
DE4442147 1994-11-26

Publications (3)

Publication Number Publication Date
EP0714222A2 true EP0714222A2 (fr) 1996-05-29
EP0714222A3 EP0714222A3 (fr) 1998-10-14
EP0714222B1 EP0714222B1 (fr) 2008-09-03

Family

ID=6534239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95118291A Expired - Lifetime EP0714222B1 (fr) 1994-11-26 1995-11-21 Processeur de signaux pseudostéréo pour récepteur mobile

Country Status (3)

Country Link
EP (1) EP0714222B1 (fr)
AT (1) ATE407541T1 (fr)
DE (2) DE4442147C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1021061A2 (fr) * 1999-01-12 2000-07-19 Robert Bosch Gmbh Procédé et récepteur por la suppression du bruit dans un recepteur radio de signaux multicanaux
EP1024679A2 (fr) * 1999-01-12 2000-08-02 Robert Bosch Gmbh Procédé pour décoder des signaux radios perturbés dans des signaux audio multicanaux

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10110422A1 (de) 2001-03-05 2002-09-19 Harman Becker Automotive Sys Verfahren zur Steuerung eines mehrkanaligen Tonwiedergabesystems und mehrkanaliges Tonwiedergabesystem

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142213A1 (fr) * 1983-11-17 1985-05-22 Koninklijke Philips Electronics N.V. Appareil pour engendrer un signal pseudo-stéréophonique
JPS6146700A (ja) * 1984-08-10 1986-03-06 Matsushita Electric Ind Co Ltd 疑似ステレオ再生回路
JPS6374232A (ja) * 1986-09-17 1988-04-04 Clarion Co Ltd ステレオ受信装置
JPS63177635A (ja) * 1986-10-29 1988-07-21 Alpine Electron Inc Ａｍ受信機
US4833715A (en) * 1987-03-06 1989-05-23 Alps Electric Co., Ltd. FM stereo receiver
EP0412725A2 (fr) * 1989-08-05 1991-02-13 Matsushita Electric Industrial Co., Ltd. Appareil de reproduction sonore
EP0503154A2 (fr) * 1991-03-14 1992-09-16 Pioneer Electronic Corporation Récepteur RDS

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598442A (ja) * 1982-07-06 1984-01-17 Matsushita Electric Ind Co Ltd 受信器
JPS63194438A (ja) * 1987-02-09 1988-08-11 Alpine Electron Inc Ｆｍステレオ受信機
US5056149A (en) * 1987-03-10 1991-10-08 Broadie Richard G Monaural to stereophonic sound translation process and apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142213A1 (fr) * 1983-11-17 1985-05-22 Koninklijke Philips Electronics N.V. Appareil pour engendrer un signal pseudo-stéréophonique
JPS6146700A (ja) * 1984-08-10 1986-03-06 Matsushita Electric Ind Co Ltd 疑似ステレオ再生回路
JPS6374232A (ja) * 1986-09-17 1988-04-04 Clarion Co Ltd ステレオ受信装置
JPS63177635A (ja) * 1986-10-29 1988-07-21 Alpine Electron Inc Ａｍ受信機
US4833715A (en) * 1987-03-06 1989-05-23 Alps Electric Co., Ltd. FM stereo receiver
EP0412725A2 (fr) * 1989-08-05 1991-02-13 Matsushita Electric Industrial Co., Ltd. Appareil de reproduction sonore
EP0503154A2 (fr) * 1991-03-14 1992-09-16 Pioneer Electronic Corporation Récepteur RDS

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
KITZEN W.J.W. ET AL: 'Applications of a digital audio-signal processor in T.V. sets' PHILIPS JOURNAL OF RESEARCH Bd. 39, Nr. 3, 1984, AMSTERDAM, Seiten 94 - 102 *
PATENT ABSTRACTS OF JAPAN Bd. 10, Nr. 205 (E-420), & JP 61 046700 A *
PATENT ABSTRACTS OF JAPAN Bd. 12, Nr. 308 (E-647), & JP 63 074232 A *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 449 (E-686), 25. November 1988 & JP 63 177635 A (ALPINE ELECTRON), 21. Juli 1988 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1021061A2 (fr) * 1999-01-12 2000-07-19 Robert Bosch Gmbh Procédé et récepteur por la suppression du bruit dans un recepteur radio de signaux multicanaux
EP1024679A2 (fr) * 1999-01-12 2000-08-02 Robert Bosch Gmbh Procédé pour décoder des signaux radios perturbés dans des signaux audio multicanaux
EP1024679A3 (fr) * 1999-01-12 2006-10-04 Robert Bosch Gmbh Procédé pour décoder des signaux radios perturbés dans des signaux audio multicanaux
EP1021061A3 (fr) * 1999-01-12 2006-10-04 Robert Bosch Gmbh Procédé et récepteur por la suppression du bruit dans un recepteur radio de signaux multicanaux

Also Published As

Publication number Publication date
DE4442147A1 (de) 1996-06-13
ATE407541T1 (de) 2008-09-15
EP0714222A3 (fr) 1998-10-14
DE4442147C2 (de) 2002-02-14
DE59511097D1 (de) 2008-10-16
EP0714222B1 (fr) 2008-09-03

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