• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for transmitting and / or receiving a potentially aggressive audio signal comprising transmitting and / or receiving successive groups of data clocked by a first clock signal within respective successive frames synchronized by a second signal of clock. In the presence of a risk of interference of the potentially abusive audio signal with another potentially victim signal during the transmission or reception of the potentially aggressive signal, the frequency (SCK) of the first clock signal is modified by maintaining unchanged the frequency (SYNC) of the second clock signal.
    公开号:FR3032573A1
    申请号:FR1550952
    申请日:2015-02-06
    公开日:2016-08-12
    发明作者:Jonathan Cottinet；Jean-Claude Bini
    申请人:STMicroelectronics Rousset SAS；STMicroelectronics Alps SAS；
    IPC主号:
    专利说明:

    [0001] A method and system for transmitting and / or receiving audio signals incorporating a frequency evasion mechanism of the transmission clock Embodiments and implementations of the invention relate to the transmission of an audio signal and more particularly the reduction of the interference generated by the audio signal potentially "aggressor" on other signals transmitted or received by surrounding transmitters / receivers considered as "victims". In a cellular mobile telephone or a wireless communication device comprising a plurality of transmitting / receiving means, the digital interfaces generally generate interference that pollutes the radio-frequency transmitters and that causes a degradation of the received signals and therefore a degradation of the signals. reception performance. These digital interfaces are considered "aggressors". The transmitters / receivers of digital audio signals generate interference, in particular due to electromagnetic leakage. FM radio receivers are very sensitive to these electromagnetic leaks, among other things because FM radios work at rather low frequencies, especially between 65 to 108 MHz. FM radio receivers are not the only "victims". Indeed, transmitters and / or receivers of type 2G and 3G are also potential victims, just like the GPS network (Global Positioning System in English), but also phase locked loops, denoted PLL, amplifiers, converters analog / digital or digital / analog, etc.
    [0002] More generally, any electronic device containing sensitive analog parts may be the victim of interference. 2G or 3G bands are higher. The minimum lower bound of these bands has a frequency of 450 MHz. Therefore, the disturbances should not be as important. However, these disturbances can still pose serious problems in receiving the signals. On the other hand, digital audio interfaces can be considered as attackers for certain electronic devices which are then considered as potential victims. There are different approaches to reduce these disturbances. A first approach is to act directly on the routing of the tracks on the printed circuits, in particular by moving as far as possible the tracks of the potential victims to reduce the electromagnetic interactions and the capacitive coupling. The major disadvantage of this approach is the surface cost and the complexity induced or added to an already complex task at the base. Some printed circuits have limited dimensions and a large number of tracks that limit the possibilities of such an approach. A second approach, called "slew-rate control" or "slew-rate limitation" in English is to use electronic means to change the initial form slot of the digital audio signal including applying a slope on the edges 20 amounts and descendants of the signal. This approach can mitigate interference but never delete them. Because of the change in signal form, the attenuation of interference is achieved to the detriment of signal integrity or sampling speed in the event that it is desired to maintain the integrity of the signal. The so-called slew-rate limitation technique does not work well for low frequency victims. According to one embodiment and implementation, there is proposed a third distinct approach of the two other presented 30 to reduce or even eliminate interference by acting directly on the frequency of a digital audio signal "aggressor" without disturbing the perception. According to one aspect, there is provided a method for transmitting and / or receiving a potentially aggressive audio signal, the method comprising transmitting and / or receiving successive groups of digital audio data clocked by a first signal of clock within successive respective frames synchronized by a second clock signal, typically corresponding to the frame rate of 5 ("frame synchronization"). According to a general characteristic of this aspect, in the presence of a risk of interference of the potentially aggressive audio signal with another potentially victim signal when transmitting or receiving the potentially abusive audio signal, the frequency of the first signal is modified. clock signal by keeping unchanged the frequency of the second clock signal. The modification (increase or decrease) of the frequency of the first clock signal which corresponds to the data transmission frequency of the audio signal makes it possible to make a frequency shift of the audio signal with respect to the frequency band to which the victim is sensitive. and thus to separate at two separate frequencies the elements of each signal, thus eliminating any interference. The change in the frequency of the first clock signal 20 is similar to a frequency evasion mechanism of the transmission clock. Maintaining the frequency of the second clock signal corresponding to the frequency of reading or writing of the potentially abusive audio signal makes it possible to avoid any modification of the sound heard by the user of the potentially abusive audio signal. Indeed, a change in the audio playback frequency would change the auditory perception of the audio signal by a sound being more serious or more acute and therefore denatured. In more extreme cases, one can even observe clips, or pops, because the device transforming the electrical signal into an acoustic signal will receive too many or too few samples. The method applies to both a "master" audio transmitter and a "master" audio receiver, the "master" component (transmitter or receiver) 3032573 setting the receive transmission frequencies of the "slave" component (receiver or receiver). transmitter). Indeed, the "master" electronic component modifies the frequency of its first clock signal and the "slave" electronic component, since it operates with the same clocks as the "master" electronic component then operates with the frequency changed. Since the frame synchronization frequency is not modified, this method complies with the electrical interface standard 125, also called "Integrated Interchip Sound". The standard 125 is a serial bus type electrical interface standard for connecting digital audio hardware together. More generally, this method is also well suited for multi-channel audio protocols, such as time division multiplexing, also known as TDM for "Time Division Multiplexing". Advantageously, the method may comprise an evaluation of the risk of interference of the potentially abusive audio signal with the other potentially victim signal having a carrier frequency, the evaluation comprising a comparison of the harmonics of the frequency of the first clock with the signal plan. frequencies to preserve. The evaluation makes it possible to anticipate the appearance of interference on the other potentially victimized signals. The evaluation is carried out on the basis of the frequencies used by the different "victim" transmitters / receivers and on the frequencies used by the different "aggressor" transmitters / receivers. Preferably, said group of data is transmitted within each frame within a processing time window whose length is less than or equal to the period of the second clock. The definition of a processing time window within a period of the second clock makes it possible to synchronize the audio data to be transmitted with the corresponding frame to each new frame. Advantageously, the time window can start on the active edge of the signal of the first clock preceding the active edge of the signal of the second clock, the data of the data group of the audio signal being transmitted from the active edge of the signal of the first clock. simultaneous clock at the active edge of the signal of the second clock. Starting the processing time window a period of the first clock before the active edge of the second clock makes it possible to ensure the good synchronization of the first and second clock regardless of the type of transmitter / receiver , especially when the frequency of the first clock has been changed between two active edges of the signal of the second clock.
    [0003] Advantageously, the signal of the first clock and the signal of the second clock can be constructed from the signal of the same main clock, the signal of the first clock resulting from a first division of the signal of the main clock and the second clock signal resulting from a second division of the main clock signal. This configuration makes it possible to modify the frequency of the signal of the first clock independently of the frequency of the signal of the second clock. Alternatively, the signal of the first clock and the signal of the second clock can be constructed from the signal of the same main clock, the signal of the first clock resulting from a division of the signal of the main clock, and the signal of the second clock resulting from a division of the signal of the first clock. In this configuration, when the signal frequency of the first clock is changed, the second divider is modified to maintain the signal frequency of the second clock unchanged. The frequency of the signal of the first clock is therefore chosen from multiples of the frequency of the signal of the second clock.
    [0004] According to another aspect, there is provided a system for transmitting and / or receiving a potentially abusive audio signal comprising a first clock capable of timing at a first frequency the transmission and / or reception of successive groups of 5 data within respective successive frames and a second clock capable of clocking said frames at a second frequency. According to a general characteristic of this aspect, the system comprises control means configured to, in the presence of a risk of interference of the potentially aggressive audio signal with a victim device processing another potentially victim signal, modify the frequency of the first signal by keeping the frequency of the second clock signal unchanged. Advantageously, the system may comprise evaluation means configured to evaluate the risk of interference of the potentially aggressive audio signal with the other potentially victim signal having a carrier frequency, the evaluation means comprising a comparator able to compare the harmonics the frequency of the first clock with the carrier frequency of the other potential victim signal.
    [0005] Advantageously, the system may comprise a main clock, a first frequency divider coupled at the output of the main clock and capable of delivering the signal of the first clock, and a second frequency divider coupled at the output of the main clock and adapted to to deliver the signal of the second clock.
    [0006] As a variant, the system may comprise a main clock, a frequency divider coupled at the output of the main clock and able to deliver the signal of the first clock to a first output, and a frequency divider coupled to a second output of the first clock. clock and able to deliver the signal of the first clock. According to yet another aspect, there is provided a communication apparatus, in particular a cellular mobile telephone, incorporating a system as defined above.
    [0007] Other advantages and features of the invention will appear on examining the detailed description of an embodiment of the invention, in no way limiting, and the accompanying drawings, in which: FIG. 1 presents a flowchart of a transmission method according to an embodiment of the invention; FIG. 2 presents a graphical representation of signals transmitted without and with modification of the frequency of the first clock signal of the method illustrated in FIG. 1; Figure 3 schematically shows a system for transmitting an audio signal according to an embodiment of the invention. FIG. 1 shows a flowchart of a method for transmitting a potentially abusive audio signal according to a mode of implementation of the invention, the transmission being considered here as the "master" element. In a first step 100 of the transmission method, a group of N bits of audio data is received. A group of N bits of audio data is received by a processing unit at each new period of a signal of a synchronization clock 4 whose frequency corresponds to the frequency of the frame, i.e. frequency at which the audio data is played later. Instead of receiving a single group of N bits, the method could include receiving a plurality of groups at a time, the groups comprising a variable number of bits. To transmit the audio data, the potentially abusive audio signal is transformed. Each group of N bits is transformed into a succession of N bits. Indeed, the N audio data bits of a group are received in parallel and are serialized before transmission. The N bits of a group are serialized at a so-called SCK transmission rate higher than the synchronization frequency SYNC. The transmission frequency SCK is chosen so as to transmit all the N bits of at least one group within the same period, that is to say, of the same frame, of the signal of the signal. synchronization clock. Before carrying out the serialization, the harmonics of the transmission frequency SCK intended for transmitting the N bits of a frame to the working frequencies of the transmitters / receivers which may be victims included in FIG. electronic apparatus in which is mounted the transmission system implementing the method. If harmonics of the transmission frequency SCK 10 correspond to the working frequency of one of the other transmitters / receivers of the potentially victim apparatus, the data transmission frequency SCK is modified in a step 120. The modification of the frequency is carried out by changing the frequency relative to the minimum frequency necessary.
    [0008] The minimum required frequency corresponds to the minimum frequency for transmitting the N bits of audio data of a group in a frame, that is to say in a period, of the signal of the synchronization clock. and the data transmission frequency SCK 20 so that none of its harmonics, or the least harmonic possible, corresponds to one of the working frequencies of the victim devices. Once the transmission frequency SCK selected, is transformed in a tape 130, the group data. The N data is thus serialized initially in parallel so as to obtain a series of N bits clocked at the transmission frequency SCK thus selected. In a next step 140, a processing time window F is generated. The processing time window F is generated on the active edge of the signal period of the transmission clock 3 preceding the active edge of the clock signal. The frequency change of the transmission clock signal 3 is performed on the active edge of the synchronization clock signal 4. Thus, in the case where the transmission frequency SCK is changed between two frames of the synchronization clock signal 4, the first period of the transmission clock signal 3 in the time window F, that is to say the period of the transmission clock signal 3 preceding the front 5 active synchronization clock 4, is different from the value of the following periods. The audio data of a group is transmitted within this time window F and within a frame of the clock signal of synchronization 4. Therefore, during the first period of the signal of the transmission clock 3 in the time window F, no data of the group is transmitted. This shift of the start of the transmission window makes it possible to ensure the good synchronization of the transmission clock 3 with the synchronization clock 4 whatever the transmitter 15 used. Finally, in a step 150, the series of N audio data bits of a group is transmitted at a transmission frequency SCK within the frame of the synchronization clock signal 4, and within the time window F.
    [0009] As illustrated in FIG. 2 which shows a graphical representation of the signals of the two clocks SCK and SYNC and of the time window F, the time window is closed before the end of the frame of the synchronization clock signal 4 and before the opening of a new time window F.
    [0010] Alternatively it is possible to provide a closure of the previous time window F coinciding with the opening of the next time window F. Moreover, as can be seen, since the opening of the time window F is synchronized with the signal SCK of the transmission clock 3, the instant of opening of the time window F varies with respect to the signal SYNC d 4. In another embodiment of the invention, the method can be applied to the reception of an audio signal, the reception being the "master" element.
    [0011] In such an embodiment, the modification of the frequency of the first clock signal by the receiver has the consequence that the "slave" transmitter will transmit the signal with the frequency of the modified first clock signal.
    [0012] FIG. 2 also comprises an example of a graphical representation (chronogram at the bottom of FIG. 2) of a signal SCK of the transmission clock 3 in the event that it is not synchronized with the time window F. In FIG. 3 is schematically shown a transmission system of an audio signal according to an embodiment of the invention, adapted to implement the method of Figure 1. Such a system can be incorporated within a device such as a TEL cellular mobile phone or a router, etc. The transmission system 1 comprises means 2 for acquiring an audio signal comprising a succession of groups of audio data, a transmission clock 3 capable of clocking at a transmission frequency SCK the transmission of 20 successive groups of data within respective successive frames and a synchronization clock 4 capable of clocking said frames at a synchronization frequency SYNC. The signals of each clock are generated from the same signal of a main clock 5.
    [0013] The processing clock 3 comprises a first divider adapted to apply a frequency division coefficient to the signal received at the input of the processing clock 3 and coming from the main clock 5. The synchronization clock 4 comprises a second divider 30 adapted to apply a frequency division coefficient to the signal received at the input of the synchronization clock 4 and coming from the main clock 5. The system 1 further comprises means 6 for evaluating the risks of interference configured to evaluate the risk of interference of the potentially abusive audio signal with a victim device processing another signal having a carrier frequency. The evaluation means 6 comprise a comparator able to compare the harmonics of the frequency SCK of the transmission clock 3 with the carrier frequency of the other signal. The system 1 also comprises control means 7 configured to, in the presence of a risk of interference of the audio signal with a victim device processing another signal, modify the frequency of the signal of the transmission clock 3 while maintaining 10 unchanged the frequency of the signal of the synchronization clock 4. In the case where the frequency of the signal of the transmission clock 3 is modified for the first time, this will generally be increased. On the other hand, in the case where this frequency has already been modified previously, it may be increased or decreased to reduce the risk of interference, provided that it is not lower than the minimum allowed frequency below which there is has a malfunction. As indicated above, the minimum required frequency corresponds to the minimum frequency for transmitting the N 20 bits of audio data of a group in a frame, i.e. in a period, of the clock signal. The system 1 comprises transmission means 8 coupled to the transmission clock 3 and the synchronization clock 4, and receiving as input the groups of bits of audio data delivered by the acquisition means 2. The transmission means 8 comprise a data serialization module 9 capable of transforming the groups of audio data in parallel into a series of data bits clocked at the transmission frequency SCK of the transmission clock 3 in a frame of the transmission clock. signal of the synchronization clock 4. The transmission means 8 furthermore comprise a module 10 for generating a processing time window F configured to generate a time window F in FIG. which audio data must be transmitted.
    [0014] The system and method for transmitting and / or receiving a potentially abusive audio signal makes it possible to reduce or even eliminate the interference generated by electromagnetic leakage of the audio signal in an electronic device by acting directly on the frequency of the audio signal. transmission of the audio signal without changing the frequency of playback of the audio signal.
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. A method for transmitting and / or receiving a potentially aggressive audio signal, the method comprising transmitting and / or receiving successive groups of digital audio data clocked by a first clock signal within respective successive frames synchronized by a second clock signal, characterized in that in the presence of a risk of interference of the potentially aggressive audio signal with at least one other potentially victim signal when transmitting or receiving said potentially abusive audio signal, one modifies (130) the frequency (SCK) of the first clock signal by keeping the frequency (SYNC) of the second clock signal unchanged.
    [0002]
    2. The method according to claim 1, comprising an evaluation (110) of the risk of interference of the potentially abusive audio signal with said at least one other potentially victimized signal, the evaluation comprising a comparison of the harmonics of the frequency of the first clock ( SCK) with the frequency plan of said potentially victimized and potentially disturbed devices.
    [0003]
    3. Method according to one of claims 1 or 2, wherein is transmitted within each frame said group of data within a time window (F) treatment whose length is less than or equal to the period of the second clock.
    [0004]
    4. Method according to claim 3, wherein the time window starts on the active front of the signal of the first clock (3) preceding the active edge of the signal of the second clock (4), the data of the data group of the audio signal. being transmitted from the active edge of the signal of the first clock (3) simultaneously to the active edge of the signal of the second clock (4).
    [0005]
    5. Method according to one of claims 1 to 4, wherein the signal of the first clock (3) and the signal of the second clock (4) are generated from the signal of the same main clock (5), the signal of the first clock (3) resulting from a first division of the signal of the main clock (5) and the signal of the second clock (4) resulting from a second division of the signal of the main clock (5).
    [0006]
    6. Method according to one of claims 1 to 4, wherein the signal of the first clock (3) and the signal of the second clock (4) 5 are generated from the signal of the same main clock (5) , the signal of the first clock (3) resulting from a division of the signal of the main clock (5), and the signal of the second clock (4) resulting from a division of the signal of the first clock (3) .
    [0007]
    7. System (1) for transmitting and / or receiving a potentially abusive audio signal comprising a first clock (3) capable of clocking at a first frequency (SCK) the transmission of successive groups of data within frames respective successive ones and a second clock (4) capable of clocking said frames at a second frequency (SYNC), characterized in that it comprises control means (7) configured for, in the presence of a risk of interference of the potentially attacking audio signal with another potentially damaging signal when transmitting or receiving the potentially attacking signal, changing the frequency (SCK) of the signal of the first clock (3) while keeping the frequency (SYNC) of the signal unchanged of the second clock (4).
    [0008]
    8. System (1) according to claim 7, comprising evaluation means (6) configured to evaluate the risk of interference of the potentially abusive audio signal with said at least one other potentially victimized signal, the means (6) 25 d evaluation comprising a comparator adapted to compare the frequency harmonics (SCK) of the first clock (3) with the frequency plane of said devices that may be disturbed.
    [0009]
    9. System according to one of claims 7 or 8, comprising a main clock (5), a first frequency divider coupled at the output of the main clock (5) and able to deliver the signal of the first clock (3) , and a second frequency divider coupled to the output of the main clock (5) and capable of delivering the signal of the second clock (4). 3032573 15
    [0010]
    10. System (1) according to one of claims 7 or 8, comprising a main clock, a frequency divider coupled to the output of the main clock and adapted to deliver the signal of the first clock on a first output, and a divider frequency coupled on a second output of the first clock and capable of delivering the signal of the first clock.
    [0011]
    Communication apparatus, in particular cellular mobile telephone, incorporating a system according to one of claims 7 to 10.
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    同族专利:
    公开号 | 公开日
    FR3032573B1|2017-01-27|
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    US9905262B2|2018-02-27|
    US20160232938A1|2016-08-11|
    US10593361B2|2020-03-17|
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    法律状态:
    2016-01-22| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-12| PLSC| Publication of the preliminary search report|Effective date: 20160812 |
    2017-01-24| PLFP| Fee payment|Year of fee payment: 3 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 4 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-12| ST| Notification of lapse|Effective date: 20211005 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1550952A|FR3032573B1|2015-02-06|2015-02-06|METHOD AND SYSTEM FOR TRANSMITTING AND / OR RECEIVING AUDIO SIGNALS INCORPORATING A FREQUENCY EVASION MECHANISM OF THE TRANSMISSION CLOCK|FR1550952A| FR3032573B1|2015-02-06|2015-02-06|METHOD AND SYSTEM FOR TRANSMITTING AND / OR RECEIVING AUDIO SIGNALS INCORPORATING A FREQUENCY EVASION MECHANISM OF THE TRANSMISSION CLOCK|
    US14/918,614| US9905262B2|2015-02-06|2015-10-21|Method for transmitting and/or receiving audio signals|
    US15/867,223| US10593361B2|2015-02-06|2018-01-10|Method for transmitting and/or receiving audio signals|
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