CN107948867A - Bandpass filtering audio frequency broadcast system based on feedback interference - Google Patents
Bandpass filtering audio frequency broadcast system based on feedback interference Download PDFInfo
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Abstract
本发明公开了基于反馈干扰的带通滤波音频播放系统，其特征在于：包括运放U2，音频接收模块，与音频接收模块相连接的带通滤波电路，串接在运放U2的1管脚和3管脚之间的电阻R13，正极与运放U2的1管脚连接、负极顺次经极性电容C6、电位器R15以及电阻R14后与运放U2的11管脚相连接的极性电容C5等；本发明可以将设定范围外的干扰噪音进行隔离，有效的去除了干扰噪音，提高通话效果。本发明可以隔离后极电路和扬声器反馈回来的干扰信号，从而提高音频信号的稳定性。
The invention discloses a band-pass filter audio playback system based on feedback interference, which is characterized in that it includes an operational amplifier U2, an audio receiving module, and a band-pass filtering circuit connected to the audio receiving module, which is connected in series to pin 1 of the operational amplifier U2 Resistor R13 between pin 3 and pin 3, the positive pole is connected to pin 1 of op amp U2, and the negative pole is connected to pin 11 of op amp U2 after passing through polarity capacitor C6, potentiometer R15 and resistor R14 in turn Capacitor C5, etc.; the present invention can isolate the interference noise outside the setting range, effectively remove the interference noise, and improve the communication effect. The invention can isolate the interference signal fed back from the rear pole circuit and the loudspeaker, thereby improving the stability of the audio signal.
Description
技术领域technical field
本发明涉及一种音频系统，具体是指一种基于反馈干扰的带通滤波音频播放系统。The invention relates to an audio system, in particular to a band-pass filter audio playback system based on feedback interference.
背景技术Background technique
随着电子技术的不断发展，电子通讯设备已得到普及，给带来了极大的便利。然而现有的电子通讯设备使用的音频输出系统还存在缺陷，即其输出的声音杂音较多，通话不够清晰，在很大程度上影响了通话质量。With the continuous development of electronic technology, electronic communication equipment has been popularized, which has brought great convenience to people. However, the audio output system used by the existing electronic communication equipment still has defects, that is, the output sound is more noisy, and the call is not clear enough, which affects the call quality to a large extent.
发明内容Contents of the invention
本发明的目的在于克服音频输出系统输出的声音杂音较多，通话不够清晰的缺陷，提供一种基于反馈干扰的带通滤波音频播放系统。The purpose of the present invention is to overcome the defects of too many voice noises output by the audio output system and the lack of clear communication, and to provide a band-pass filter audio playback system based on feedback interference.
本发明的目的通过下述技术方案实现：基于反馈干扰的带通滤波音频播放系统，包括运放U2，音频接收模块，与音频接收模块相连接的带通滤波电路，串接在运放U2的1管脚和3管脚之间的电阻R13，正极与运放U2的1管脚连接、负极顺次经极性电容C6、电位器R15以及电阻R14后与运放U2的11管脚相连接的极性电容C5，一端与运放U2的1管脚连接、另一端经电阻R16后与电位器R15的控制端连接的电阻R17，一端与运放U2的3管脚连接、另一端经电阻R12后与运放U2的2管脚连接的电阻R11，与运放U2的1管脚连接的音频放大电路，以及与音频放大电路相连接的扬声器BT；所述运放U2的2管脚与电阻R17和电阻R16的连接点连接、3管脚与带通滤波电路连接。The purpose of the present invention is achieved through the following technical solutions: the band-pass filter audio playback system based on feedback interference, comprising operational amplifier U2, audio receiving module, the band-pass filtering circuit connected with the audio receiving module, connected in series in the operational amplifier U2 Resistor R13 between pin 1 and pin 3, the positive pole is connected to pin 1 of op amp U2, and the negative pole is connected to pin 11 of op amp U2 after passing through polarity capacitor C6, potentiometer R15 and resistor R14 in sequence The polarity capacitor C5, one end is connected to the 1 pin of the operational amplifier U2, the other end is connected to the control terminal of the potentiometer R15 after the resistor R16, the other end is connected to the 3 pin of the operational amplifier U2, and the other end is connected to the resistor After R12, the resistance R11 connected to the 2 pins of the operational amplifier U2, the audio amplifier circuit connected to the 1 pin of the operational amplifier U2, and the speaker BT connected to the audio amplifier circuit; the 2 pins of the operational amplifier U2 and the The connecting point of the resistor R17 and the resistor R16 is connected, and the pin 3 is connected to the band-pass filter circuit.
进一步的，所述带通滤波电路包括与音频接收模块相连接的二阶高通滤波电路，串接在二阶高通滤波电路和运放U2的3管脚之间的二阶低通滤波电路。Further, the band-pass filter circuit includes a second-order high-pass filter circuit connected to the audio receiving module, and a second-order low-pass filter circuit connected in series between the second-order high-pass filter circuit and pin 3 of the operational amplifier U2.
所述二阶高通滤波电路包括运算放大器A1，一端与音频接收模块相连接、另一端经电容C2后与运算放大器A1的正极相连接的电容C1，P极经电阻R3后接地、N极与电容C1和电容C2的连接点相连接的二极管D1，串接在二极管D1的N极和运算放大器A1的输出端之间的电阻R2，串接在运算放大器A1的输出端和二极管D1的P极之间的电阻R4，以及一端与运算放大器A1的正极相连接、另一端接地的电阻R1；所述运算放大器A1的输出端与二阶低通滤波电路相连接，其负极与二极管D1的P极相连接。The second-order high-pass filter circuit includes an operational amplifier A1, one end of which is connected to the audio receiving module, and the other end is connected to the positive pole of the operational amplifier A1 through a capacitor C2. The diode D1 connected to the connection point of C1 and the capacitor C2 is connected in series between the N pole of the diode D1 and the output terminal of the operational amplifier A1. The resistor R2 is connected in series between the output terminal of the operational amplifier A1 and the P pole of the diode D1. The resistor R4 between them, and the resistor R1 with one end connected to the positive pole of the operational amplifier A1 and the other end grounded; the output terminal of the operational amplifier A1 is connected to the second-order low-pass filter circuit, and its negative pole is in phase with the P pole of the diode D1 connect.
所述二阶低通滤波电路包括运算放大器A2，一端与运算放大器A1的输出端相连接、另一端经电阻R7后与运算放大器A2的正极相连接的电阻R5，一端与电阻R5和电阻R7的连接点相连接、另一端与运算放大器A2的输出端相连接的电容C4，与电容C4相并联的电阻R8，一端与运算放大器A2的正极相连接、另一端接地的电容C3，与电容C3相并联的电阻R6，以及一端与运算放大器A2的输出端相连接、另一端经电阻R10后接地的电阻R9；所述运算放大器P2的负极与电阻R9和电阻R10的连接点相连接、其输出端则与运放U2的3管脚相连接。Described second-order low-pass filter circuit comprises operational amplifier A2, and one end is connected with the output end of operational amplifier A1, the other end is connected with the positive pole of operational amplifier A2 after resistance R7 resistor R5, one end is connected with resistance R5 and resistance R7 Capacitor C4 connected to the connection point and the other end connected to the output end of the operational amplifier A2, resistor R8 connected in parallel with the capacitor C4, capacitor C3 connected to the positive pole of the operational amplifier A2 at one end and grounded at the other end, and connected to the capacitor C3 Resistor R6 connected in parallel, and one end connected to the output terminal of operational amplifier A2, the other end connected to the resistor R9 after resistor R10; It is then connected to pin 3 of the operational amplifier U2.
所述音频放大电路包括放大芯片U1，正极与放大芯片U1的3管脚相连接、负极接地的极性电容C7，与极性电容C7相并联的电阻R20，一端与放大芯片U1的3管脚相连接、另一端接电源的电阻R18，串接在放大芯片U1的2管脚和6管脚之间的电容C8，与电容C8相并联的电阻R19；所放大芯片U1的2管脚与运算放大器A2的输出端相连接、其7管脚接电源、4管脚接地、6管脚与扬声器BT连接。The audio amplifier circuit includes an amplifier chip U1, a positive electrode connected to the 3 pins of the amplifier chip U1, a polar capacitor C7 with a negative electrode grounded, a resistor R20 connected in parallel with the polar capacitor C7, and one end connected to the 3 pins of the amplifier chip U1 Resistor R18 connected to each other and the other end connected to the power supply, capacitor C8 connected in series between pin 2 and pin 6 of the amplifying chip U1, resistor R19 connected in parallel with capacitor C8; pin 2 of the amplified chip U1 and the operation The output terminals of the amplifier A2 are connected, its 7 pins are connected to the power supply, its 4 pins are grounded, and its 6 pins are connected to the speaker BT.
所述二阶高通滤波电路的中心频率为所述二阶低通滤波电路的中心频率为 The center frequency of the second-order high-pass filter circuit is The center frequency of the second-order low-pass filter circuit is
所述二阶高通滤波电路的增益AF1等于二阶低通滤波电路的增益AF2，即：所述带通滤波电路的增益AF＝AF1AF2。The gain A F1 of the second-order high-pass filter circuit is equal to the gain A F2 of the second-order low-pass filter circuit, that is: The gain A F of the band-pass filter circuit = A F1 A F2 .
所述带通滤波电路的滤波频率为300～3000Hz。The filter frequency of the band-pass filter circuit is 300-3000 Hz.
本发明较现有技术相比，具有以下优点及有益效果：Compared with the prior art, the present invention has the following advantages and beneficial effects:
(1)本发明可以将设定范围外的干扰噪音进行隔离，有效的去除了干扰噪音，提高通话效果。(1) The present invention can isolate the interference noise outside the setting range, effectively remove the interference noise, and improve the communication effect.
(2)本发明可以隔离后极电路和扬声器反馈回来的干扰信号，从而提高音频信号的稳定性。(2) The present invention can isolate the interference signal fed back from the rear pole circuit and the loudspeaker, thereby improving the stability of the audio signal.
附图说明Description of drawings
图1为本发明的整体结构示意图。Figure 1 is a schematic diagram of the overall structure of the present invention.
具体实施方式Detailed ways
下面结合实施例对本发明作进一步地详细说明，但本发明的实施方式并不限于此。The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.
实施例Example
如图1所示，本发明的基于反馈干扰的带通滤波音频播放系统，包括运放U2，音频接收模块，与音频接收模块相连接的带通滤波电路，串接在运放U2的1管脚和3管脚之间的电阻R13，正极与运放U2的1管脚连接、负极顺次经极性电容C6、电位器R15以及电阻R14后与运放U2的11管脚相连接的极性电容C5，一端与运放U2的1管脚连接、另一端经电阻R16后与电位器R15的控制端连接的电阻R17，一端与运放U2的3管脚连接、另一端经电阻R12后与运放U2的2管脚连接的电阻R11，与运放U2的1管脚连接的音频放大电路，以及与音频放大电路相连接的扬声器BT；所述运放U2的2管脚与电阻R17和电阻R16的连接点连接、3管脚与带通滤波电路连接。As shown in Figure 1, the band-pass filter audio playback system based on feedback interference of the present invention includes an operational amplifier U2, an audio receiving module, a band-pass filtering circuit connected to the audio receiving module, and a tube connected in series to the operational amplifier U2 Resistor R13 between pin 3 and pin 3, the positive pole is connected to pin 1 of op amp U2, the negative pole is connected to pin 11 of op amp U2 after passing through polarity capacitor C6, potentiometer R15 and resistor R14 in turn Sexual capacitor C5, one end is connected to the 1 pin of the operational amplifier U2, the other end is connected to the control terminal of the potentiometer R15 through the resistor R16, the other end is connected to the 3 pin of the operational amplifier U2, and the other end is connected to the control terminal of the potentiometer R15 The resistor R11 connected to the 2 pins of the operational amplifier U2, the audio amplifier circuit connected to the 1 pin of the operational amplifier U2, and the speaker BT connected to the audio amplifier circuit; the 2 pins of the operational amplifier U2 are connected to the resistor R17 It is connected to the connection point of resistor R16, and pin 3 is connected to the band-pass filter circuit.
具体的，该音频接收模块用于接收音频信号，其可采用现有的天线来实现。该带通滤波电路的滤波频率为300～3000Hz，其可以有效的过滤干扰噪音而保留说话的音频信号，从而使本发明输出的声音更加清晰。Specifically, the audio receiving module is used to receive audio signals, which can be realized by using an existing antenna. The filter frequency of the band-pass filter circuit is 300-3000 Hz, which can effectively filter the interference noise and retain the audio signal of the speech, so that the output sound of the present invention is clearer.
为了过滤干扰信号，如图1所示，该带通滤波电路包括与音频接收模块相连接的二阶高通滤波电路，串接在二阶高通滤波电路和运放U2的3管脚之间的二阶低通滤波电路。In order to filter the interference signal, as shown in Figure 1, the band-pass filter circuit includes a second-order high-pass filter circuit connected to the audio receiving module, and a second-order high-pass filter circuit connected in series between the second-order high-pass filter circuit and the 3 pins of the operational amplifier U2 order low-pass filter circuit.
具体的，该二阶高通滤波电路包括运算放大器A1，电容C1，电容C2，电阻R1，电阻R2，电阻R3，电阻R4以及二极管D1。Specifically, the second-order high-pass filter circuit includes an operational amplifier A1, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a diode D1.
连接时，该电容C1的一端与音频接收模块相连接、另一端经电容C2后与运算放大器A1的正极相连接。二极管D1的P极经电阻R3后接地、N极与电容C1和电容C2的连接点相连接。电阻R2串接在二极管D1的N极和运算放大器A1的输出端之间。电阻R4串接在运算放大器A1的输出端和二极管D1的P极之间。电阻R1的一端与运算放大器A1的正极相连接、另一端接地。所述运算放大器A1的输出端与二阶低通滤波电路相连接，其负极与二极管D1的P极相连接。When connected, one end of the capacitor C1 is connected to the audio receiving module, and the other end is connected to the anode of the operational amplifier A1 after passing through the capacitor C2. The P pole of the diode D1 is grounded after passing through the resistor R3, and the N pole is connected to the connection point of the capacitor C1 and the capacitor C2. The resistor R2 is connected in series between the N pole of the diode D1 and the output terminal of the operational amplifier A1. The resistor R4 is connected in series between the output terminal of the operational amplifier A1 and the P pole of the diode D1. One end of the resistor R1 is connected to the anode of the operational amplifier A1, and the other end is grounded. The output end of the operational amplifier A1 is connected to a second-order low-pass filter circuit, and its cathode is connected to the P pole of the diode D1.
音频接收模块输出的音频信号经电容C1和电容C2进行过滤后输入给运算放大器A1，该运算放大器A1、电容C1、电容C2、电阻R4以及电阻R3共同形成高通滤波器；该运算放大器A1为负反馈，其可以稳定电路的增益。该二阶高通滤波电路的中心频率为在本实施例中，该电容C1和电容C2的容值均为0.068μF，电阻R1和电阻R2的阻值均为8.2KΩ；由上述公式可得出，本实施例中二阶高通滤波电路的中心频率f1＝286Hz。另外，二极管D1的型号为14001，电阻R4的阻值为27KΩ，电阻R3的阻值为47KΩ，运算放大器A1的型号为OP07。运算放大器A1输出的音频信号输入到二阶低通滤波电路。The audio signal output by the audio receiving module is filtered by capacitor C1 and capacitor C2 and then input to the operational amplifier A1. The operational amplifier A1, capacitor C1, capacitor C2, resistor R4 and resistor R3 together form a high-pass filter; the operational amplifier A1 is a negative Feedback, which stabilizes the gain of the circuit. The center frequency of the second-order high-pass filter circuit is In this embodiment, the capacitance values of the capacitor C1 and the capacitor C2 are both 0.068 μF, and the resistance values of the resistor R1 and the resistor R2 are both 8.2 KΩ; it can be concluded from the above formula that the second-order high-pass filter circuit in this embodiment Center frequency f 1 =286 Hz. In addition, the model of the diode D1 is 14001, the resistance value of the resistor R4 is 27KΩ, the resistance value of the resistor R3 is 47KΩ, and the model of the operational amplifier A1 is OP07. The audio signal output by the operational amplifier A1 is input to the second-order low-pass filter circuit.
如图1所示，该二阶低通滤波电路包括运算放大器A2，电阻R5，电阻R7，电阻R6，电阻R8，电阻R9，电阻R10，电容C3以及电容C4。具体连接时，该电阻R5的一端与运算放大器A1的输出端相连接、另一端经电阻R7后与运算放大器A2的正极相连接。电容C4的一端与电阻R5和电阻R7的连接点相连接、另一端与运算放大器A2的输出端相连接。电阻R8与电容C4相并联。电容C3的一端与运算放大器A2的正极相连接、另一端接地。电阻R6与电容C3相并联。电阻R9的一端与运算放大器A2的输出端相连接、另一端经电阻R10后接地。所述运算放大器P2的负极与电阻R9和电阻R10的连接点相连接、其输出端则与运放U2的3管脚相连接。As shown in FIG. 1, the second-order low-pass filter circuit includes an operational amplifier A2, a resistor R5, a resistor R7, a resistor R6, a resistor R8, a resistor R9, a resistor R10, a capacitor C3 and a capacitor C4. When specifically connected, one end of the resistor R5 is connected to the output terminal of the operational amplifier A1, and the other end is connected to the positive pole of the operational amplifier A2 after passing through the resistor R7. One end of the capacitor C4 is connected to the connection point of the resistor R5 and the resistor R7, and the other end is connected to the output end of the operational amplifier A2. Resistor R8 is connected in parallel with capacitor C4. One end of the capacitor C3 is connected to the anode of the operational amplifier A2, and the other end is grounded. Resistor R6 is connected in parallel with capacitor C3. One end of the resistor R9 is connected to the output end of the operational amplifier A2, and the other end is grounded after passing through the resistor R10. The negative electrode of the operational amplifier P2 is connected to the connection point of the resistor R9 and the resistor R10, and its output terminal is connected to the 3-pin of the operational amplifier U2.
运算放大器A1输出的音频信号经电阻R5和电阻R7后输入给运算放大器A2，同时电容C3和电容C4可对音频信号进行滤波；该运算放大器A2、电阻R5、电阻R7、电容C3、电阻R6、电容C4以及电阻R8共同形成低通滤波器。运算放大器A2也为负反馈，其可以稳定电路的增益。该二阶低通滤波电路的中心频率为在本实施例中，电阻R5和电阻R7的阻值均为8.2KΩ，电容C3和电容C4的容值均为0.0068μF；由上述公式可得出，本实施例中二阶低通滤波电路的中心频率f2＝2856Hz。另外，该电阻R6的阻值为10KΩ，电阻R8的阻值为1KΩ，电阻R9的阻值为27KΩ，电阻R10的阻值为47KΩ，运算放大器A2的型号为OP07。The audio signal output by the operational amplifier A1 is input to the operational amplifier A2 through the resistor R5 and the resistor R7, and the capacitor C3 and the capacitor C4 can filter the audio signal at the same time; the operational amplifier A2, the resistor R5, the resistor R7, the capacitor C3, the resistor R6, Capacitor C4 and resistor R8 together form a low-pass filter. Operational amplifier A2 is also negative feedback, which can stabilize the gain of the circuit. The center frequency of the second-order low-pass filter circuit is In this embodiment, the resistance values of resistor R5 and resistor R7 are both 8.2KΩ, and the capacitance values of capacitor C3 and capacitor C4 are both 0.0068μF; it can be concluded from the above formula that the second-order low-pass filter circuit in this embodiment Center frequency f 2 =2856Hz. In addition, the resistance value of the resistor R6 is 10KΩ, the resistance value of the resistor R8 is 1KΩ, the resistance value of the resistor R9 is 27KΩ, the resistance value of the resistor R10 is 47KΩ, and the model of the operational amplifier A2 is OP07.
由上述可得，本实施例的带通滤波电路的截止频率为286Hz～2856Hz，从而有效的将说话的声音频率信号以外的干扰信号进行隔离，提高通话质量。From the above, it can be concluded that the cut-off frequency of the band-pass filter circuit of this embodiment is 286 Hz-2856 Hz, thereby effectively isolating interference signals other than speech frequency signals and improving call quality.
另外，所述二阶高通滤波电路的增益AF1等于二阶低通滤波电路的增益AF2，即：所述带通滤波电路的增益AF＝AF1AF2。In addition, the gain A F1 of the second-order high-pass filter circuit is equal to the gain A F2 of the second-order low-pass filter circuit, that is: The gain A F of the band-pass filter circuit = A F1 A F2 .
另外，该运放U2，极性电容C5，极性电容C6，电阻R17，电阻R16，电位器R15以及电阻R14共同形成一个隔离缓冲器；该隔离缓冲器可以隔离后级低失真音频放大电路和扬声器BT的反馈干扰信号，从而提高系统的稳定性。本实施例中，该运放U2的型号为LM324，极性电容C5的容值为1μF，极性电容C6的容值为4.7μF，电阻R17的阻值为10KΩ，电阻R16的阻值为100KΩ，电位器R15的阻值为10KΩ，电阻R14的阻值为4.7KΩ，电阻R12的阻值为100KΩ，电阻R11的阻值为4.7KΩ，电阻R13的阻值为22KΩ。音频信号从运放U2的1管脚输出给音频放大电路。In addition, the operational amplifier U2, polarized capacitor C5, polarized capacitor C6, resistor R17, resistor R16, potentiometer R15 and resistor R14 together form an isolation buffer; the isolation buffer can isolate the subsequent low-distortion audio amplifier circuit and The feedback from the speaker BT interferes with the signal, thus improving the stability of the system. In this embodiment, the model of the operational amplifier U2 is LM324, the capacitance of the polar capacitor C5 is 1 μF, the capacitance of the polar capacitor C6 is 4.7 μF, the resistance of the resistor R17 is 10KΩ, and the resistance of the resistor R16 is 100KΩ , the resistance value of the potentiometer R15 is 10KΩ, the resistance value of the resistor R14 is 4.7KΩ, the resistance value of the resistor R12 is 100KΩ, the resistance value of the resistor R11 is 4.7KΩ, and the resistance value of the resistor R13 is 22KΩ. The audio signal is output to the audio amplifier circuit from pin 1 of the operational amplifier U2.
另外，所述音频放大电路包括放大芯片U1，正极与放大芯片U1的3管脚相连接、负极接地的极性电容C7，与极性电容C7相并联的电阻R20，一端与放大芯片U1的3管脚相连接、另一端接12V电压的电阻R18，串接在放大芯片U1的2管脚和6管脚之间的电容C8，与电容C8相并联的电阻R19。所述放大芯片U1的2管脚与运算放大器A2的输出端相连接、其7管脚接12V电压、4管脚接地、6管脚与扬声器BT连接。In addition, the audio amplifier circuit includes an amplifier chip U1, a polar capacitor C7 whose positive pole is connected to the pin 3 of the amplifier chip U1, and whose negative pole is grounded, and a resistor R20 connected in parallel with the polar capacitor C7, and one end is connected to the pin 3 of the amplifier chip U1. The pins are connected and the other end is connected to a resistor R18 with a voltage of 12V, a capacitor C8 is connected in series between pin 2 and pin 6 of the amplifier chip U1, and a resistor R19 is connected in parallel with the capacitor C8. The 2 pins of the amplifier chip U1 are connected to the output terminal of the operational amplifier A2, the 7 pins are connected to 12V voltage, the 4 pins are grounded, and the 6 pins are connected to the speaker BT.
运算放大器A2输出的音频信号输入到放大芯片U1中，由放大芯片U1放大后驱动扬声器BT。该极性电容C7和电阻R20形成一个滤波器，其可以对输入电压进行滤波处理，使放大芯片U1工作更加稳定；该电阻R18起分压作用，该电阻R18和电阻R20的阻值均为10KΩ，极性电容C7的容值为0.1μF，电阻R19的阻值为1KΩ，电容C8的容值为4.7μF，放大芯片U1的型号为LM74。The audio signal output by the operational amplifier A2 is input into the amplifier chip U1, and is amplified by the amplifier chip U1 to drive the speaker BT. The polar capacitor C7 and the resistor R20 form a filter, which can filter the input voltage to make the amplifier chip U1 work more stably; the resistor R18 acts as a voltage divider, and the resistance values of the resistor R18 and the resistor R20 are both 10KΩ , the capacitance of the polar capacitor C7 is 0.1 μF, the resistance of the resistor R19 is 1 KΩ, the capacitance of the capacitor C8 is 4.7 μF, and the model of the amplifier chip U1 is LM74.
如上所述，便可很好的实现本发明。As described above, the present invention can be well realized.
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| US20070269055A1 (en) * | 2006-05-17 | 2007-11-22 | Erath Louis W | Feedback System for a Multiple Element Loudspeaker |
| CN105763162A (en) * | 2015-01-05 | 2016-07-13 | 音乐集团公司 | Power Amplifiers Coupled In Series |
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