EP1139591A2 - Méthode et récepteur pour la réception de la radiodiffusion audionumérique DAB - Google Patents

Méthode et récepteur pour la réception de la radiodiffusion audionumérique DAB Download PDF

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Publication number
EP1139591A2
EP1139591A2 EP01302889A EP01302889A EP1139591A2 EP 1139591 A2 EP1139591 A2 EP 1139591A2 EP 01302889 A EP01302889 A EP 01302889A EP 01302889 A EP01302889 A EP 01302889A EP 1139591 A2 EP1139591 A2 EP 1139591A2
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EP
European Patent Office
Prior art keywords
coded signal
magnitude
received coded
signal
received
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Withdrawn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
EP01302889A
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German (de)
English (en)
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EP1139591A3 (fr
Inventor
Akihiko Takada
Tomonori Takana
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Faurecia Clarion Electronics Co Ltd
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Clarion Co Ltd
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Filing date
Publication date
Application filed by Clarion Co Ltd filed Critical Clarion Co Ltd
Publication of EP1139591A2 publication Critical patent/EP1139591A2/fr
Publication of EP1139591A3 publication Critical patent/EP1139591A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
    • H04H60/43—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas for identifying broadcast channels

Definitions

  • the present invention relates to method and device for receiving DAB (digital audio broadcast).
  • the DAB can provide high-quality digital audio programs for a receiver, in particular, on a mobile unit.
  • a DAB receiver includes an antenna for receiving a signal carrying DAB data, an amplification system for amplifying the received signal, a decoding system for decoding the received signal into digital data, and a reproducing system for reproducing MPEG audio data contained in the digital data and outputting the same to a speaker.
  • the DAB receiver further includes a search system for searching a broadcast signal, within a predetermined frequency range, which can be decoded into digital data.
  • the decoding system fails in decoding the signal.
  • the searching system if it receives a relatively strong signal, it attempts to decode the signal. However, if the received signal includes relatively strong noise components, but does not include decodable or reproducible data, even if the decoding operation is normally performed, the reproducing system fails to reproduce the audio data.
  • the search system continues searching a frequency band until an appropriate frequency can be detected (i.e., until the audio data is reproduced). Therefore, in the conventional DAB receiver, signals are decoded each time a frequency, which may contain undecodable signal or noise components, is detected, until the reproduction of the audio data is successfully performed. As a result of such a configuration, the conventional DAB receiver usually takes a relatively long time, from starting the searching process, until the reproduction of the audio data.
  • a method of receiving and decoding a coded signal for a digital broadcast which is provided with the steps of:
  • the condition of the received signal is checked, before it is decoded into digital data, to determine the received signal is decodable/reproducible. Therefore, unnecessary decoding/reproducing operations during the search operation can be avoided, and a stable frequency can be caught and the data is reproduced quickly.
  • the predetermined condition may includes an upper limit of the magnitude of the received coded signal
  • the step of judging may include a step of examining whether a magnitude of the received coded signal is lower than the upper limit of the magnitude of the received coded signal.
  • the step of judging judges that the received coded signal is decodable when the magnitude of the received coded signal is lower than the upper limit.
  • the step of relaxing may include a step of raising the upper limit.
  • the predetermined condition may include a lower limit of the magnitude of the received coded signal
  • the step of judging may include a step of examining whether a magnitude of the received coded signal is greater than the lower limit of the magnitude of the received coded signal.
  • the step of judging judges that the received coded signal is decodable when the magnitude of the received coded signal is greater than the lower limit.
  • the step of relaxing may include a step of lowering the lower limit.
  • the predetermined condition may include a threshold of the amount of noise components included in the received coded signal
  • the step of judging may include a step of examining whether the amount of noise components included in the received coded signal is lower than the threshold of the amount of the noise components included in the received coded signal.
  • the step of judging judges that the received coded signal is decodable when the amount of noise components is lower than the threshold.
  • the step of relaxing may include a step of increasing the threshold.
  • a digital broadcast receiver for receiving a digital broadcast may be configured to employ any one of the methods described above.
  • a digital broadcast receiver for receiving a digital broadcast, which is provided with
  • a DAB (Digital Audio Broadcast) receiver according to an embodiment of the invention will be described with reference to the drawings attached hereto, in which:
  • Fig. 1 is a block diagram showing a configuration of the DAB receiver 1.
  • a DAB signal is received by an antenna 101, and is input to a high frequency amplifier 102, which will be referred to as a first amplifier 102.
  • the output of the high frequency amplifier 102 is input to a mixing circuit 103, and also input to a first AGC (Automatic Gain Controlling) circuit 120.
  • the first amplifier 102 is configured to change the gain thereof in accordance with the voltage applied to a gain control terminal thereof.
  • the first AGC circuit 120 outputs a first AGC voltage V AGC1 , which is applied to the gain control terminal of the first amplifier 102.
  • the first AGC circuit 120 operates to output the first AGC voltage V AGC1 such that the magnitude of the signal output from the first amplifier 102 has a constant magnitude Vp with respect to a predetermined magnitude range of the signal input to the first amplifier 102.
  • the upper limit and the lower limit of the first AGC voltage V AGC1 are 0 and V1 (>0), respectively.
  • the gain of the first amplifier 102 is the maximum value Gmax when the first AGC voltage V AGC1 is 0, while the gain is the minimum value Gmin when the first AGC voltage V AGC1 is V1.
  • Fig. 2A shows a relationship between the electrical field strength of the received signal (i.e., the magnitude of the signal input to the first amplifier 102) and the magnitude of the output of the first amplifier 102.
  • a first range i.e., 0 ⁇ E ⁇ Eth1 where the magnitude of the signal input to the first amplifier 102 is relatively small
  • the magnitude of the output signal does not reach the predetermined constant level V1 even if the gain is Gmax. Therefore, in the first range (i.e., the electrical field strength E ⁇ a first threshold Eth1), the magnitude of the output signal varies, in a range lower than the constant level Vp, in accordance with the magnitude of the input signal.
  • the gain decreases from the Gmax as the electrical field strength increases, and when the electrical field strength reaches Emax, the gain becomes Gmin.
  • Eth1 ⁇ E ⁇ Emax which will be referred to as a second range, the magnitude of the output signal is maintained to be the constant value Vp regardless of the magnitude of the input signal.
  • the magnitude of the output signal varies, in a range greater than the predetermined level Vp, in accordance with the magnitude of the input signal.
  • the output characteristic of the first amplifier 102 has the first range, where the gain is Gmax, the second range where the output level is Vp, and the third range where the gain is Gmin.
  • the gain of the first amplifier 102 can be arbitrarily set within a range from Gmax to Gmin ( ⁇ Gmax), inclusively, then the third range does not exist.
  • the gain Gmin may have a certain value so that a controllable range of the gain is not unnecessarily widened.
  • Fig. 2B shows a relationship between the electrical field strength of the received signal and the first AGC voltage V AGC1 output by the first AGC circuit 120.
  • the first AGC voltage V AGC1 is V1 in the first range (i.e., the gain of the first amplifier 102 is Gmax), and, in the second range, the first AGC voltage VAGC1 decreases from the upper limit V1 to the lower limit 0 (i.e., the gain of the first amplifier 102 decreases from Gmax to Gmin) as the electrical field strength E increases from the first threshold Eth1 to the maximum threshold Emax.
  • the other input terminal of the mixing circuit 103 is connected with a local oscillator 104.
  • the first mixing circuit 103 converts a desired DAB signal frequency into an IF (intermediate frequency) signal in accordance with the frequency output by the local oscillator 104, and outputs the converted signal to a SAW filter 121.
  • the SAW filter 121 filters the frequency components other than the desired DAB signal frequency, and outputs the desired DAB frequency component to an intermediate frequency amplifier (which will be referred to as a second amplifier) 106.
  • a control circuit 113 sets a frequency division ratio in a PLL circuit 105, and changes the frequency of the local oscillator 104.
  • the second amplifier 106 is configured to have a gain control terminal and the gain thereof is changed in accordance with the voltage (i.e., a second AGC voltage) applied to the gain control terminal.
  • a second AGC circuit 125 outputs the second AGC voltage V AGC2 in accordance with the output of the second amplifier 106.
  • the second AGC voltage V AGC2 is applied to the gain control terminal of the second amplifier 106.
  • Fig. 3A is a graph showing a relationship between the output of the first amplifier 102, which is input to the second amplifier 106, and the output of the second amplifier 106. As shown in Fig. 2A, the magnitude of the output of the first amplifier 102 increases from 0 to Vp in the first range, and is maintained at Vp in the second range. As aforementioned, according to the embodiment, the third range will not be considered.
  • the second AGC circuit 125 operates to output the second AGC voltage V AGC2 such that when the magnitude of the signal input to the second amplifier 106 is in a range from 0 to a predetermined voltage Vr, which is smaller than Vp, the gain of the second amplifier is the maximum value G'max, and that when the magnitude of the input signal is in a range from Vr to Vp, the magnitude of the output signal is a constant value V'r. It should be noted that when the magnitude of the input signal is in the range from 0 to Vr, the output of the second amplifier 106 varies in a range from 0 to V'r.
  • the predetermined voltage V'r is determined to correspond to the output voltage of the first amplifier 102 when the electrical field strength E of the input signal is a second threshold value Eth2, as shown in Fig. 2A. Therefore, when the magnitude of the signal input to the first amplifier 102 is less than the second threshold Eth2, the magnitude of the output of the first amplifier 102 is less than Vr, which is input to the second amplifier 106. Then, as shown in Fig. 3A, the magnitude of the signal output from the second amplifier 106 is less than V'r.
  • Fig. 3B is a graph showing a relationship between the magnitude of the output of the first amplifier 102 and the second AGC voltage V AGC2 .
  • V AGC2 V2
  • the second AGC voltage V AGC2. is decreased as the magnitude of the output of the first amplifier 102 increases so that the magnitude of the output signal of the second amplifier 106 is the constant value V'r. While the output of the first amplifier 102 increases from Vr to Vp, the gain of the second amplifier 102 decreases from the maximum value G'max to the minimum value G'min.
  • the signal output from the second amplifier 106 is. transmitted to the AGC amplifier (which will be referred to as a third amplifier) 123, with the frequency components other than predetermined frequency components being cut by an IF (intermediate frequency) filter 122.
  • the AGC amplifier which will be referred to as a third amplifier
  • the third amplifier 123 is also a variable gain amplifier having a gain control terminal. To the gain control terminal of the third amplifier 123, a third AGC voltage V AGC3 is applied by a channel decoder 107. The third AGC voltage V AGC3 is controlled such that the magnitude of the signal output from the third amplifier 123 is constant. The output signal of the third amplifier 123 is input to an A/D converter 124, which converts the input to signal to digital data. The digital data is transmitted from the A/D converter 124 to the channel decoder 107.
  • Fig. 4A shows a relationship between the magnitude of the output of the second amplifier 106 and the output of the third amplifier 123
  • Fig. 4B shows a relationship between the magnitude of the input signal of the third amplifier 123 and the third AGC voltage V AGC3
  • the magnitude of the output signal of the second amplifier 106 increases from 0 to V'r as the magnitude of the output signal of the first amplifier increases from 0 to Vr, and is the constant value V'r when the magnitude of the output of the first amplifier 102 is in a range between Vr and Vp.
  • the third AGC voltage V AGC3 decreases as the magnitude of the output of the second amplifier 106 changes from 0 to Vr so that the output of the third amplifier 123 is constant.
  • the third AGC voltage V AGC3 is 0, which is the minimum value.
  • the channel decoder 107 is controlled by a control circuit 113 to select data corresponding to a DAB program designated by a user, and to transmit the selected data to an MPEG audio decoder 108.
  • the output of the MPEG audio decoder 108 is transmitted to a D/A converter 109, which converts the input data into an analog signal. Then, the analog signal is applied to a speaker 110, thereby an audio service of a DAB being finally provided to the user.
  • Fig. 5 shows an exemplary configuration of the channel decoder 107.
  • the digital signal output by the A/D converter 124 is OFDM-decoded by an FFT circuit 131. Then, a plurality of pieces of the data obtained by OFDM-decoding are re-arranged in order using a de-interleave circuit 132. At this time, the data in a transmission frame is grouped for each service (i.e., DAB program) as shown in Fig. 11. After re-arrangement of the DAB data in order using the de-interleave circuit 132, an error correction is performed by a Viterbi decoder 133. Then, the control circuit 113 extracts necessary service data, which is transmitted to the MPEG audio decoder 108.
  • DAB program i.e., DAB program
  • the output of the FFT circuit 131 is also input to a synchronization control unit 134, where a frequency shift, an FFT window shift, and a clock frequency shift are corrected, thereby the synchronization both in frequency and time being established.
  • a digital AGC control unit 135 receives the output of the third amplifier 123, which is converted into the digital data by the A/D converter 124, through the FFT circuit 131, and outputs the third AGC voltage V AGC3 to the third amplifier 123.
  • Figs. 6A-6C show relationships between the electrical field strength of the received signal and the first through third AGC voltages V AGC1 , V AGC2 and V AGC3 .
  • Figs. 6A-6C are similar to Figs. 2B, 3B and 4B, respectively, except that the horizontal axes thereof represent the electrical field strength of the received signal.
  • the first AGC circuit 120 operates such that the magnitude of the output of the first amplifier 102 is constant when the electrical field strength E is Eth1 ⁇ E ⁇ Eth2, and the second AGC circuit 125 operates such that the output of the second amplifier 106 is constant when Eth2 ⁇ E ⁇ Eth1. Further, the digital AGC control unit 135 operates such that the output of the third amplifier 123 is constant when E ⁇ Eth2. Thus, if E ⁇ Emax, the magnitude of the signal input to the A/D converter 124 is constant.
  • the electrical field strength E of the received signal can be determined. Therefore, based on the values of the first through third AGC voltages V AGC1 , V AGC2 and V AGC3 , whether a DAB signal is to be processed can be determined during the frequency search, before the decoding operation is performed.
  • the first through third AGC voltages V AGC1 , V AGC2 and V AGC3 are input to the controller 113, as shown in Fig. 1.
  • the controller 113 determines that the signal is too strong and cannot be decoded. Further, if the electrical field strength of the received signal is less than a lower limit E LL (>0), the controller 113 determines that the signal is too weak and cannot be decoded.
  • the controller 113 determines that the signal is too strong and cannot be decoded. As shown in Fig. 6C, if the third AGC voltage V AGC3 is greater than a voltage V LL which corresponds to the lower limit E LL of the electrical field strength, the controller 113 determines that the signal is too weak and cannot be decoded.
  • degree of noise components in particular an adjacent interference DAB signal
  • the controller 113 determines that the signal cannot be received in good condition, and the decoding procedure for the signal is not performed. In this case, another frequency search is performed.
  • FIGs. 7A and 7B show the magnitude of the received signal and the first and second AGC voltages V AGC1 and V AGC2 , respectively.
  • the first AGC voltage V AGC1 is Va (> 0), and the second AGC voltage V AGC2 is 0. That is, points a in Figs. 7A and 7B represent the status of the received signal. If the noise components are included in the received signal, then even if the first AGC voltage V AGC1 is Va, since the magnitude of the signal output by the first amplifier 102 is lowered as the noise components are well attenuated by the SAW filter 104, the magnitude of the signal input to the second amplifier is less than Va. In this case, the second AGC circuit 125 outputs V'a as the second AGC voltage V AGC2 .
  • the controller 113 judges that the electrical field strength of the received signal is Eth2 ⁇ E ⁇ Eth1. That is, as shown in Fig. 7B, from the second AGC voltage V AGC2 , which is V'a, the electrical field strength of the received signal is judged to be E'a. Therefore, Ea - E'a is obtained as the amount ⁇ representing the noise components.
  • V'a/Va is greater.
  • Fig. 8 is a graph showing a boundary condition of decodable/undecodable signal.
  • the horizontal axis represents the first AGC voltage V AGC1
  • the vertical axis represents the second AGC voltage V AGC2 .
  • a line L in the graph represents the boundary line. Based on a position of a point P identified by the voltages Va and V'a with respect to the boundary line L , whether the received signal is decodable or undecodable is judged.
  • the boundary line L has an inclination of ⁇ , which is intrinsic to individual receivers, and if the inclination ⁇ is greater, the receiver can decode the received signal even if the amount ⁇ of the noise components is large.
  • Fig. 9 is a flowchart illustrating a frequency search procedure according to the embodiment of the present invention.
  • a variable PLL_Freq is set to a predetermined initial search frequency PLL_Min, and control proceeds to S101.
  • S101 it is determined whether the PLL is locked at the frequency PLL_Freq. If the PLL is locked (S101: YES), then control proceeds to S102. If the PLL is not locked (S101: NO), then control proceeds to S110.
  • Fig. 10 shows the condition check procedure at S102 of Fig. 9 in detail.
  • such a frequency is stored in the memory, and in the succeeding searching procedures, for the frequencies stored in the memory, it is determined that the received signal does not satisfy the required condition. That is, if the frequency PLL_Freq is the frequency stored in the memory, control proceeds to S110.
  • the first AGC voltage V AGC1 is compared with the voltage V UL corresponding to the upper limit E UL of the electrical field strength of the received signal. If V ACG1 ⁇ V UL , the received signal is too strong and control proceeds to S110.
  • the third AGC voltage V AGC3 is compared with the voltage V LL corresponding to the lower limit E LL of the electrical field strength of the received signal. If V AGC3 > V L L, the received signal is too weak and control proceeds to S110.
  • the ratio of the second AGC voltage V AGC 2 to the first AGC voltage V AGC1 is compared with the inclination ⁇ of the boundary line shown in Fig. 8 to determine whether the received signal is decodable. If V AGC2 /V AGC1 ⁇ ⁇ , then the signal is decodable and control proceeds to S103. If V AGC2 /V AGC1 > ⁇ , the magnitude of the noise components is too strong, and the signal cannot be decoded. In this case, the frequency represented by PLL_Freq is stored in the memory of the controller 113 (S209), and then control proceeds to S110.
  • the synchronizing control unit 134 examines the signal input to the channel decoder 107 to judge whether the time synchronization is established. If the time synchronization is established (S103: YES), control proceeds to S105. Otherwise, control proceeds to S110.
  • step S105 it is judged whether the digital data input to the MPEG audio decoder 108 can be correctly regenerated by the MPEG audio decoder 108. If it is judged that the MPEG audio decoder 108 can correctly execute the regenerating process (S105: YES), then control proceeds to step S110. Otherwise (S105: NO), in order to prevent the decoding/regenerating procedure of the current frequency PLL_Freq in the succeeding procedures after the condition is changed, the frequency PLL_Freq is stored in the memory of the controller 113.
  • step S110 it is judged whether the variable PLL_Freq has reached a maximum search frequency PLL_Max.
  • step S111 at least one of the limit/threshold values referred to in S102 is changed, and the criteria for determining whether the magnitude of the received signal at the frequency PLL_Freq is in a predetermined range and whether the noise components included in the received signal at the frequency PLL_Freq are removable is relaxed, and then control proceeds to S112. Specifically, in S111, at least one of (1) lowering the lower limit V UL of the first AGC voltage V AGC1 , (2) raising the upper limit V LL of the third AGC voltage V AGC3 , and (3) increasing the inclination ⁇ .
  • limit/threshold values may be changed in various ways in accordance with or regardless of the condition of the received signal. For example, if the first AGC voltages V AGC1 corresponding the received signals tend to be lower than the lower limit V UL , it is preferable that the lower limit V UL is lowered. Further, if the third AGC voltages V AGC3 corresponding the received signals tend to be greater than the upper limit V LL , it is preferable that the upper limit V LL is raised. Furthermore, if the received signals are tend to be judged to be undecodable due to the noise components included therein, it is preferable that the inclination ⁇ that is used as the threshold value is increased.
  • step S112 the variable PLL_Freq is reset to PLL_Min, and control returns to S101. It should be noted that, once the process in S112 has been performed, even if the frequency PLL_Freq is locked in S101, the input condition is judged to be NG in S102 if (1) the frequency PLL_Freq is a frequency which was judged not to be reproducible, or (2) the frequency PLL_Freq is a frequency which was judged that the noise components were removable. In such a case, control proceeds from S102 to S110.
  • the condition of the received signal is checked, before it is decoded into digital data, to determine the received signal is decodable/reproducible. Therefore, unnecessary decoding/reproducing operations during the search operation can be avoided, and a stable frequency can be caught and the data is reproduced quickly.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
EP01302889A 2000-03-28 2001-03-28 Méthode et récepteur pour la réception de la radiodiffusion audionumérique DAB Withdrawn EP1139591A3 (fr)

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JP2000088150 2000-03-28
JP2000088150 2000-03-28

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EP1139591A3 EP1139591A3 (fr) 2004-07-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100029232A1 (en) * 2006-02-06 2010-02-04 Siemens Vdo Automotive Aktiengesellschaft Method for Searching for Signals Among Interference Signals in a Multi-Channel Radio Receiver
CN111698001A (zh) * 2019-03-13 2020-09-22 凌通科技股份有限公司 无线充电发射器解码电路以及使用其的无线充电发射器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0804023A2 (fr) * 1996-04-24 1997-10-29 Lg Electronics Inc. Appareil de détection, de mémorisation et de commutation à haute vitesse de canal et méthode associée
EP0944213A2 (fr) * 1998-03-18 1999-09-22 Kabushiki Kaisha Kenwood Recépteur pour diffusion numérique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3034908B2 (ja) * 1990-05-18 2000-04-17 パイオニア株式会社 ラジオ受信機のプリセット・スキャン方式
US5842119A (en) * 1993-02-05 1998-11-24 Emerson; Harry Edwin Radio scanner and display system
JP3955143B2 (ja) * 1998-02-19 2007-08-08 富士通テン株式会社 ディジタル放送受信機

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0804023A2 (fr) * 1996-04-24 1997-10-29 Lg Electronics Inc. Appareil de détection, de mémorisation et de commutation à haute vitesse de canal et méthode associée
EP0944213A2 (fr) * 1998-03-18 1999-09-22 Kabushiki Kaisha Kenwood Recépteur pour diffusion numérique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100029232A1 (en) * 2006-02-06 2010-02-04 Siemens Vdo Automotive Aktiengesellschaft Method for Searching for Signals Among Interference Signals in a Multi-Channel Radio Receiver
US8588716B2 (en) * 2006-02-06 2013-11-19 Continental Automotive Ag Method for searching for signals among interference signals in a multi-channel radio receiver
CN111698001A (zh) * 2019-03-13 2020-09-22 凌通科技股份有限公司 无线充电发射器解码电路以及使用其的无线充电发射器
CN111698001B (zh) * 2019-03-13 2021-09-03 凌通科技股份有限公司 无线充电发射器解码电路以及使用其的无线充电发射器

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