EP1884026A1 - Procédé et dispositif de traitement de signaux reçus par un récepteur de signaux radiophoniques et autoradio comportant un tel dispositif - Google Patents
Procédé et dispositif de traitement de signaux reçus par un récepteur de signaux radiophoniques et autoradio comportant un tel dispositifInfo
- Publication number
- EP1884026A1 EP1884026A1 EP06723404A EP06723404A EP1884026A1 EP 1884026 A1 EP1884026 A1 EP 1884026A1 EP 06723404 A EP06723404 A EP 06723404A EP 06723404 A EP06723404 A EP 06723404A EP 1884026 A1 EP1884026 A1 EP 1884026A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- parameter
- reception
- signals
- processing
- signal 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005236 sound signal Effects 0.000 claims abstract description 21
- 238000003672 processing method Methods 0.000 claims description 18
- 238000000638 solvent extraction Methods 0.000 claims description 3
- 230000006870 function Effects 0.000 description 13
- 238000011282 treatment Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1646—Circuits adapted for the reception of stereophonic signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
Definitions
- the present invention relates to a method and a device for processing signals received by a radio signal receiver. It also relates to a car radio with such a device.
- Received signals means RF (Radio Frequency) signals intended to be received by such receivers. These signals will therefore also be designated in the rest of the description by the terms “radio signals” or "RF signals”.
- RF signals are distinguishable from audio signals reproduced by such receivers in a conventional manner from information contained in the RF signals.
- These audio signals will be designated in the rest of the description by the terms “small signals” or “small audio signals”.
- the invention relates to a method for processing signals received by a radio signal receiver comprising a step of adjusting at least one processing parameter of small audio signals obtained from the received signals.
- Such a signal processing device received by a radio signal receiver is for example described in the European patent application EP 1 006 666.
- a processing device of this type makes it possible to set parameters such as a sound level, switching to mono / stereo mode or bandwidth of small audio signals. These processing parameters are set according to reception conditions of the RF signals to improve the quality of perception of the sounds returned by the car radio.
- a reception parameter such as a power of the received RF signals, is measured, and then the measured value of this reception parameter is used to adjust the value of the processing parameters.
- the invention aims to solve this problem by providing a received signal processing device for which one does not face such a compromise.
- the subject of the invention is therefore a method for processing signals received by a radio signal receiver comprising a step of adjusting at least one parameter for processing small audio signals obtained from the received signals, characterized in that it further comprises a prior step of partitioning a representation space of a reception quality of the radio signals into a plurality of reception areas in which the radio signal receiver is likely to be, and in that the setting of The processing parameter of the small audio signals is determined according to one of the reception areas in which the radio signal receiver is located.
- a signal processing method allows an optimal adjustment of the processing parameters of the small restored signals, depending on the reception area in which the radio signal receiver is located.
- a signal processing method comprises:
- reception parameters are particularly relevant for defining this space for representing a quality of reception of the received radio signals.
- the step of determining a reception zone includes an estimation of an average value, in a predetermined time window, of each measured reception parameter according to which the reception zone in which the reception receiver is determined is determined. radio signals is located, and a selection of a reception area corresponding to the set of estimated average values. This estimate of an average value makes it possible to add a certain inertia to the treatment method, which makes it possible to avoid detecting changes in untimely zones.
- a signal processing method may comprise a step of measuring at least one parameter for receiving the radio signals, and the setting of the processing parameter of the small audio signals can also be determined according to the measured reception parameter.
- a method according to the invention would make it possible to provide several methods for adjusting the value of the treatment parameters as a function of the measured value of the reception parameter, according to the reception zones in which the radio signal receiver is likely to be, which is not provided for in EP 1 006666.
- a signal processing method according to the invention may further comprise the following steps:
- each set being associated with a reception zone among the plurality of zones in which the radio signal receiver is likely to be, selecting a set of predetermined coefficients associated with the area in which the radio signal receiver is located, and
- the setting of the processing parameter of the small audio signals is determined according to a combination of the measured reception parameter and the selected set of coefficients.
- the combination of the measured receive parameter and the selected set of coefficients determining the setting of the processing parameter is defined by a system of at least one equation.
- Each set of predetermined coefficients may include at least one small signal processing time constant, such as an attack time constant and / or a release time constant.
- the small signal processing time constants are also dependent on the area in which the radio signal receiver is located.
- the adjustment of the treatment parameter comprises:
- each estimated value of this processing parameter being a function of a measured reception parameter and a part of the coefficients of the set of coefficients selected and
- the determination of a final value of the processing parameter can consist in determining a minimum value among the plurality of estimated values of this processing parameter.
- This determination of a final value of the two-step processing parameter makes it possible to use a simple system of equations to achieve the combination of the measured reception parameter and the selected set of predetermined coefficients.
- the processing parameter (s) is or are chosen from one of the elements of the set consisting of a sound level, a transition to mono / stereo mode and a band. passing small audio signals.
- the receiving parameter (s) is (are) selected from at least one of the set consisting of a power, a multipath indication parameter, a an indication parameter of an adjacent transmitter and a modulation of the received signals.
- the reception parameter (s) according to which the zone in which the radio signal receiver is located is determined or is selected from among at least one of the elements of the set consisting of a power and a multipath indication parameter of the received signals.
- the invention also relates to a device for processing signals received by a radio signal receiver, for the implementation of a processing method according to the invention, characterized in that it comprises:
- the invention also relates to a car radio comprising a signal processing device as defined above.
- FIG. 1 shows schematically the general structure of a treatment device according to the invention
- FIG. 2 represents the successive steps of a treatment method according to the invention.
- FIG. 3 shows a diagram for determining an area in which is a radio signal receiver.
- the radio signal receiver 10 shown in FIG. 1 comprises an antenna 12 for receiving radio signals and a device 13 for processing the signals received by this antenna 12.
- the processing device 13 conventionally comprises means 14 for reproducing small audio signals from the radio signals received by the antenna 12 and a low frequency amplifier 15 applied to the small signals supplied by the reproduction means 14 to modify their restitution. .
- the low frequency amplifier processes small signals using processing parameters that it receives as input.
- the processing device 13 further comprises means 16 for measuring at least one reception parameter.
- the reception parameters are, for example, a power, a multipath indication parameter, an indication parameter of an adjacent transmitter, and a modulation of the received signals. These parameters are estimated in a manner known per se from an analysis of the radio signals received by the antenna 12. Among the reception parameters estimated by the measuring means 16, at least a portion is transmitted to means 17, 18, 20 for determining an area
- the multipath power and indication parameters are transmitted to the determination means 17, 18, 20.
- the determination means 17, 18, 20 advantageously comprise means 17 for estimating an average value, in a predetermined time window, of each reception parameter that it receives. They furthermore comprise means 18 for selecting an area corresponding to the set of average values estimated by the means 17.
- the selection means 18 are associated with storage means 20 (a conventional type of memory), in which a plurality of sets of predetermined coefficients are stored. Each set of coefficients is associated with a reception area among the plurality of areas in which the signal receiver 10 is likely to be located.
- storage means 20 a conventional type of memory
- the coefficients of any one of the stored sets are intended to be combined with the reception parameters estimated by the measurement means 16 to adjust the processing parameters of the small audio signals restored by the means 14 of the processing device 13.
- an attack time constant and / or a relaxation time constant of the treatments performed on the small signals corresponds to an application delay of the processes determined by the small signal processing parameters.
- the relaxation time constant corresponds to a delay of the withdrawal of the treatments determined by the processing parameters applied to the small signals.
- the selection means 18 operate in the following way: according to the average values of the reception parameters provided by the estimation means 17, they determine an area in which the radio signal receiver is, among all the zones in which the radio signal receiver is likely to be located, each reception area being associated with a defined set of average values of these reception parameters; and - They then select the set of coefficients stored in the storage means 20 which corresponds to the selected area.
- the processing device 13 furthermore comprises means 19 for transmitting the set of predetermined coefficients selected by the selection means 18, to means 22 for adjusting at least one parameter for processing the small audio signals as a function of a combination of the measured reception parameters and the predetermined set of coefficients selected.
- the parameters for processing small signals include, for example:
- - a switch to mono / stereo mode; and a parameter for defining a bandwidth of the small audio signals.
- the adjustment means 22 thus receive, as input, the reception parameters estimated by the measurement means 17, as well as the set of predetermined coefficients selected by the means 18. At the output, they supply the processing parameters set to the low frequency amplifier. 15 for the treatment of small signals.
- the adjustment means 22 operate, for example, as follows:
- each estimated value of this processing parameter being a function of a measured reception parameter and a part of the coefficients of the set of selected coefficients
- the final value of the processing parameter is determined so as to correspond to the smallest of the estimated values of this parameter treatment. For example, if one notes: - NS the sound level, MS the parameter of passage in mono / stereo mode, BP the bandwidth, with regard to the parameters of treatment of the small signals, - PR1 the power, PR2 the multipath indication parameter,
- NS 3 e ⁇ x PR 3 + ⁇
- NS 4 g, - x PR 4 + h 1
- the means 14, 16, 17, 18, 19 and 22 have previously been described in a functional manner. From this functional description, they can be easily implemented in software or programmed in at least one conventional microprocessor, in the processing device 13.
- the processing device 13 described above operates, for example, according to the method described below with reference to FIG. 2.
- the processing device 13 receives radio signals from the antenna 12.
- the measuring means 16 estimate instantaneous values of the reception parameters PR1, PR2, PR3 and PR4. These instantaneous values are transmitted by the measuring means 16 to the adjustment means 22.
- a portion of these parameters is taken to be supplied to the means 17 for estimating an average value.
- PR1 power
- PR2 multipath indication parameter
- an area in which the receiver 10 is located is determined, based on the average values calculated by the means 17. The selection is carried out using a diagram which will be described later, in reference to Figure 3.
- the set of predetermined coefficients associated with the selected zone is selected.
- the adjustment means 22 calculates a plurality of estimated values of the processing parameters, using the system of equations (1). In the following step 44, the adjustment means 22 calculate the final values of the processing parameters, using the system of equations (2).
- the low frequency amplifier 15 processes the small signals restored by the means 14, as a function of the processing parameters estimated by the adjustment means 22 and the attack times and release times also provided in the set of predetermined coefficients selected.
- a representation space of a reception quality of the radio signals can be defined by a diagram in which the abscissa represents the values that the multipath indication parameter PR2 can take. , and the ordinate axis represents the values that the power parameter PR1 of the received signals can take.
- the partitioned representation space is then stored, for example, in the memory 20.
- Zone Z1 corresponds to high power values and low or medium values of the multipath indication parameter, which indicates that zone Z1 is a zone of very good reception.
- This zone is associated with the set of predetermined coefficients Ja 1 , ..., Z 1 , ta ⁇ t ⁇ .
- Zone Z2 corresponds to medium or high power values and high values of the multipath indication parameter, which generally corresponds to a city area. This zone is associated with the set of predetermined coefficients ⁇ a 2 , ..., z 2 , ta 2 , tr 2 ⁇ .
- Zone Z3 corresponds to low or medium power values and low or medium values of the multipath indication parameter, which generally corresponds to a lowland area in the field. This zone is associated with the set of predetermined coefficients ⁇ a 3 Z 3 , ta 3 , tr 3 ⁇ .
- Zone Z4 corresponds to low or medium power values and average or even high values of the multipath indication parameter, which generally corresponds to a valley area in the field. This zone is associated with the set of predetermined coefficients ⁇ a 4 , ..., Z 4 , ta 4 , tr 4 ⁇ .
- zone Z5 corresponds to:
- zone Z5 is a zone of very poor reception of small signals.
- This zone is associated with the set of predetermined coefficients ⁇ a 5 , ..., Z 5 , ta 5 , tr 5 ⁇ .
- Release times are chosen for each zone according to a certain number of rules. For example, in an area such as zone Z1 or Z3, the release time should be low. In an area such as zone Z2, Z4 or Z5, the release time must be high.
- the selection of the zone depends directly on average values of the power parameter
- PR1 and the multipath indication parameter PR2 additional conditions may be added for the selection of the area to be dependent.
- other reception parameters measured by the measuring means 16 such as the indication parameter of an adjacent transmitter PR3 or the modulation of the received signals PR4.
- these last two parameters can be taken into account to modify the position of a point found in the diagram of FIG. 3 on the basis of the parameters PR1 and PR2.
- the system of equations (1) can be modified and the function for determining a final value of the processing parameters from several estimated values of these processing parameters can be chosen other than the "Minimum" function. It is clear that a method and a processing device according to the invention make it possible to add great flexibility in the processing of the signals received by a receiver of radio signals, such as a car radio, depending on the area in which this receiver is located. No compromise is necessary to determine the values of the coefficients since these are a function of different predefined reception areas.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0505241A FR2886489B1 (fr) | 2005-05-25 | 2005-05-25 | Procede et dispositif de traitement de signaux recus par un recepteur de signaux radiophoniques et autoradio comportant un tel dispositif |
PCT/EP2006/002321 WO2006125486A1 (fr) | 2005-05-25 | 2006-03-14 | Procédé et dispositif de traitement de signaux reçus par un récepteur de signaux radiophoniques et autoradio comportant un tel dispositif |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1884026A1 true EP1884026A1 (fr) | 2008-02-06 |
Family
ID=34982082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06723404A Withdrawn EP1884026A1 (fr) | 2005-05-25 | 2006-03-14 | Procédé et dispositif de traitement de signaux reçus par un récepteur de signaux radiophoniques et autoradio comportant un tel dispositif |
Country Status (6)
Country | Link |
---|---|
US (1) | US7742749B2 (fr) |
EP (1) | EP1884026A1 (fr) |
KR (1) | KR101322349B1 (fr) |
CN (1) | CN101128983B (fr) |
FR (1) | FR2886489B1 (fr) |
WO (1) | WO2006125486A1 (fr) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5379449A (en) * | 1992-11-23 | 1995-01-03 | Ford Motor Company | Automotive radio employing multipath correction strategy based on vehicle speed |
DE19542737A1 (de) * | 1995-11-16 | 1997-05-22 | Bayerische Motoren Werke Ag | Schaltanordnung für mobile Rundfunkempfänger |
DE69832078T2 (de) * | 1998-11-30 | 2006-06-01 | Siemens Ag | Verfahren zur Rauschverminderung beim Empfang eines HF FM Signals |
US6741844B2 (en) * | 2001-11-27 | 2004-05-25 | Motorola, Inc. | Receiver for audio enhancement and method therefor |
US6771957B2 (en) * | 2001-11-30 | 2004-08-03 | Interdigital Technology Corporation | Cognition models for wireless communication systems and method and apparatus for optimal utilization of a radio channel based on cognition model data |
JP4133604B2 (ja) * | 2003-06-10 | 2008-08-13 | アルパイン株式会社 | ラジオ受信機 |
-
2005
- 2005-05-25 FR FR0505241A patent/FR2886489B1/fr not_active Expired - Fee Related
-
2006
- 2006-03-14 EP EP06723404A patent/EP1884026A1/fr not_active Withdrawn
- 2006-03-14 CN CN2006800058805A patent/CN101128983B/zh not_active Expired - Fee Related
- 2006-03-14 KR KR1020077019276A patent/KR101322349B1/ko active IP Right Grant
- 2006-03-14 US US11/883,930 patent/US7742749B2/en not_active Expired - Fee Related
- 2006-03-14 WO PCT/EP2006/002321 patent/WO2006125486A1/fr not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2006125486A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101128983B (zh) | 2013-02-06 |
CN101128983A (zh) | 2008-02-20 |
FR2886489A1 (fr) | 2006-12-01 |
WO2006125486A1 (fr) | 2006-11-30 |
US20080166987A1 (en) | 2008-07-10 |
US7742749B2 (en) | 2010-06-22 |
KR101322349B1 (ko) | 2013-10-25 |
FR2886489B1 (fr) | 2007-07-06 |
KR20080009679A (ko) | 2008-01-29 |
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