Audio and video signal processing device

Abstract

The present invention relates to an audio-video signal processing apparatus, which comprises: an audio-video application circuit, a power supply circuit, and at least one impedance matching circuit, wherein the audio-video application circuit is configured to receive, process, and output audio and / or video intermodulation signals; the power supply circuit is configured to output a DC voltage to the audio-video application circuit for powering it; the impedance matching circuit includes a plurality of impedance elements, at least one input end, and at least one output end, and is arranged before or inside the audio-video application circuit. The audio-video signal processing apparatus of the present invention can perform impedance matching and timing adjustment on the power supply signal and the audio and / or video intermodulation signals, thereby reducing the intermodulation distortion generated by the audio and / or video intermodulation signals during transmission through the impedance matching circuit.

Description

Technical Field

[0001] The present invention generally relates to the technical field of signal processing. More specifically, the present invention relates to an audio-video signal processing device. Background Art

[0002] Generally speaking, the sound and / or video signals output by an audio-video signal source or transmitted in a circuit are a complex energy-combined intermodulation signal, which may include fundamental signals and harmonic signals with multiple different frequency components, and the amplitudes of the fundamental signals and harmonic signals of each frequency component may also be different. The so-called "intermodulation" refers to the mutual influence and mutual modulation between the above signals with different frequencies and / or different amplitudes. In particular, for video signals, they may include monochromatic signals with different frequencies, monochromatic signals decomposed from each composite color, and signals instantaneously synthesized from each monochromatic color, among which there may also be direct reflection signals from sampling points. The impedance characteristics and timing relationships of various components in existing audio-video signal processing circuits or devices respond differently to various signal components in the above-described sound and / or video signals. During the transmission and processing of sound and / or video signals, existing audio-video signal processing circuits or devices usually only process the sound and / or video signals as single-frequency signals. However, since the sound and / or video signals are composed of a mixture of multiple intermodulation signals with different frequencies and amplitudes, the impedance values they exhibit in the audio-video signal processing circuit or device are different for each frequency component signal. This can cause the impedance value of the audio-video signal processing circuit or device to not match the impedance value of the load or the impedance value of the audio-video signal source, and may thus generate local standing waves in the audio-video signal processing circuit. The standing waves are superimposed on the signals of each frequency and amplitude component, ultimately causing the signals of multiple frequency and amplitude components, especially the harmonic component signals, to be filtered out, weakened, or enhanced at a certain moment, resulting in intermodulation distortion in the transmission of the original sound and / or video signals.

[0003] In addition, when signals of multiple frequency and amplitude components in an audio and / or video intermodulation signal flow through the same audio and / or video signal processing circuit or device, due to their different presented reactance values, the timing of reaching the receiving end will be different. Before the audio and / or video intermodulation signal enters the circuit or device, the phases of the signal components of each frequency and amplitude in it are consistent with each other. However, after passing through the transmission and processing of the circuit or device, due to the overall reactance characteristics of the circuit or device having different timing responses and gains for signal components of different frequencies and amplitudes, the phases, gains, and time delays of the signal components of each frequency and amplitude are inconsistent when reaching the output end of the circuit or device. This will cause energy attenuation of the signal components of each frequency and amplitude, especially the harmonic component signals. Eventually, it causes intermodulation distortion of the total received signal synthesized by restoring the signal components of each frequency at the output end of the circuit or device.

[0004] In summary, the circuits or devices in the prior art can only transmit signals of a single frequency and amplitude without distortion, and are unable to handle synthetic intermodulation signals composed of multiple frequency and amplitude components. In addition, the audio and / or video signal can flow through multiple positions in the audio-video signal processing circuit or device. For example, it can flow through the input stage, output stage, feedback terminal, etc. of the circuit or device; it can also be output from the audio-video signal source to the circuit or device, thereby generating intermodulation signal distortion locally corresponding in the circuit or device. Therefore, it is necessary to transmit and process the audio and / or video signals without distortion in the above different situations. Summary of the Invention

[0005] To solve one or more of the problems in the above background art, the present invention provides an audio-video signal processing device. The device includes an audio-video application circuit, a power supply circuit, and an impedance matching circuit. For different audio-video application circuits, by setting the number and impedance values of the impedance elements of each part and each layer in the impedance matching circuit, when the audio and / or video intermodulation signal and / or the power supply signal flow through the impedance matching circuit, signals of different frequencies and / or amplitudes therein automatically select their respective optimal paths for transmission, thereby performing impedance matching and timing consistency adjustment on the audio and / or video intermodulation signal and / or the power supply signal, and finally achieving distortion-free transmission of the audio and / or video signal.

[0006] Specifically, the present invention discloses an audio - video signal processing device. The device includes: an audio - video application circuit configured to receive, process, and output audio and / or video inter - modulation signals; a power supply circuit configured to output a power supply signal to the audio - video application circuit for powering it; and at least one impedance matching circuit, where each impedance matching circuit includes: a plurality of impedance elements that form a mesh structure including at least one grid, the grid having sides and vertices and at least one side being formed by at least one impedance element; at least one input terminal, where each input terminal is connected to a vertex in the at least one grid and is configured to receive the audio and / or video inter - modulation signals; and at least one output terminal, where each output terminal is connected to another vertex in the at least one grid and is configured to output the audio and / or video inter - modulation signals processed by the impedance matching circuit.

[0007] The impedance matching circuit is connected to the audio - video application circuit, so that an impedance - matchable loop is formed between the impedance matching circuit and the audio - video application circuit and between the impedance matching circuit and the power supply circuit for audio and / or video inter - modulation signals and power supply signals with different frequencies and / or amplitudes.

[0008] In one embodiment, at least two of the plurality of impedance elements have different impedance values, so that signals with different frequencies and / or amplitudes in the audio and / or video inter - modulation signals and the power supply signals pass through different paths in the mesh structure.

[0009] In another embodiment, the impedance element is at least one of the following: a capacitor; an inductor; a capacitor and an inductor; a resistor and a capacitor; a resistor and an inductor; and a resistor, a capacitor, and an inductor.

[0010] In yet another embodiment, the impedance matching circuit is arranged before or inside the audio - video application circuit.

[0011] In yet another embodiment, arranging the impedance matching circuit before the audio - video application circuit includes arranging the impedance matching circuit between the power supply circuit and the audio - video application circuit, connecting the input terminal of the impedance matching circuit to the power supply circuit, and connecting the output terminal of the impedance matching circuit to the audio - video application circuit, so that an impedance - matchable loop is formed between the impedance matching circuit and the audio - video application circuit for audio and / or video inter - modulation signals with different frequencies and / or amplitudes, and an impedance - matchable loop is formed between the impedance matching circuit and the power supply circuit for power supply signals with different frequencies and / or amplitudes.

[0012] In another embodiment, the impedance matching circuit is arranged before the audio-video application circuit, and further includes that the impedance matching circuit is arranged between the audio-video application circuit and the audio-video signal source. The input end of the impedance matching circuit is connected to the audio-video signal source, and the output end of the impedance matching circuit is connected to the audio-video application circuit, so as to form a loop with impedance matching for audio and / or video intermodulation signals of different frequencies and / or amplitudes between the impedance matching circuit and the audio-video signal source.

[0013] In another embodiment, the impedance matching circuit is arranged inside the audio-video application circuit, and includes that the impedance matching circuit is arranged at the input stage of the audio-video application circuit, so as to form a loop with impedance matching for audio and / or video intermodulation signals of different frequencies and / or amplitudes between the impedance matching circuit and the input stage of the audio-video application circuit.

[0014] In another embodiment, the impedance matching circuit is arranged inside the audio-video application circuit, and further includes that the impedance matching circuit is arranged at the output stage of the audio-video application circuit, so as to form a loop with impedance matching for audio and / or video intermodulation signals of different frequencies and / or amplitudes between the impedance matching circuit and the output stage of the audio-video application circuit.

[0015] In yet another embodiment, the impedance matching circuit is arranged inside the audio-video application circuit, and further includes that the impedance matching circuit is arranged at the feedback end of the audio-video application circuit, so as to form a loop with impedance matching for audio and / or video intermodulation signals of different frequencies and / or amplitudes between the impedance matching circuit and the feedback end of the audio-video application circuit.

[0016] In yet another embodiment, there are multiple audio-video application circuits, the power supply circuit outputs multiple power supply signals to supply power to the multiple audio-video application circuits respectively, and the impedance matching circuit is one or more.

[0017] The audio-video signal processing device of the present invention can perform impedance matching between the power supply circuit and the audio-video application circuit, so as to restore the audio-video signal transmitted through the audio-video signal processing device without distortion. In addition, by arranging the impedance matching circuit at different positions of the audio-video application circuit, the device of the present invention has a wide range of application scenarios. It can perform impedance matching between the audio-video signal source and the audio-video application circuit, and can also perform impedance matching between various parts inside the audio-video application circuit. Brief Description of the Drawings

[0018] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals denote the same or corresponding parts, wherein:

[0019] Figure 1 is a schematic structural diagram showing an audio - video signal processing device according to an embodiment of the present invention;

[0020] Figure 2 is a two - dimensional structural diagram showing an impedance matching circuit according to an embodiment of the present invention;

[0021] Figure 3 is a three - dimensional structural diagram showing an impedance matching circuit according to an embodiment of the present invention;

[0022] Figure 4 is an exemplary signal flow diagram showing an impedance matching circuit according to an embodiment of the present invention;

[0023] Figure 5 is another exemplary signal flow diagram showing an impedance matching circuit according to an embodiment of the present invention;

[0024] Figure 6 is a schematic structural diagram showing an audio - video signal processing device in which an impedance matching circuit is located before an audio - video application circuit according to an embodiment of the present invention;

[0025] Figure 7 is another schematic structural diagram showing an audio - video signal processing device in which an impedance matching circuit is located before an audio - video application circuit according to an embodiment of the present invention;

[0026] Figure 8 is a connection schematic diagram showing an impedance matching circuit and a signal transformer according to an embodiment of the present invention;

[0027] Figure 9 is a connection schematic diagram showing an impedance matching circuit and an audio - video signal line according to an embodiment of the present invention;

[0028] Figure 10 is a schematic structural diagram showing an audio - video signal processing device in which an impedance matching circuit is located inside an audio - video application circuit according to an embodiment of the present invention;

[0029] Figure 11 is a schematic structural diagram showing an audio - video signal processing device in which an impedance matching circuit is located at the input stage and the output stage of an audio - video application circuit according to an embodiment of the present invention;

[0030] Figure 12It is a schematic structural diagram of an audio - video signal processing device in which an impedance matching circuit according to an embodiment of the present invention is located at the input stage and the feedback terminal of an audio - video application circuit; and

[0031] Figure 13 It is a schematic structural diagram of an audio - video signal processing device including a plurality of impedance matching circuits and a plurality of audio - video application circuits according to an embodiment of the present invention. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0033] As Figure 1 shown, the audio - video signal processing device 100 of the present invention may include: an audio - video application circuit 110 configured to receive, process, and output audio and / or video inter - modulation signals; a power supply circuit 120 configured to output a power supply signal to the audio - video application circuit for powering it; and at least one impedance matching circuit 130 arranged before or inside the audio - video application circuit, so that impedance - matching loops are formed between the impedance matching circuit and the audio - video application circuit and the power supply circuit respectively for audio and / or video inter - modulation signals and power supply signals with different frequencies and / or amplitudes.

[0034] Further, each of the impedance matching circuits may include a plurality of impedance elements 131, and the plurality of impedance elements form a mesh structure 133 including a mesh 132. The mesh has sides 134 and vertices 135, and at least one of the sides is constituted by at least one impedance element. The impedance matching circuit further includes at least one input terminal 136, where each input terminal is connected to one vertex of the plurality of meshes and is used to receive the audio and / or video inter - modulation signals. The impedance matching circuit further includes at least one output terminal 137, where each output terminal is connected to another vertex of the plurality of meshes and is used to output the audio and / or video inter - modulation signals processed by the impedance matching circuit.

[0035] In one embodiment, the mesh of the impedance matching circuit may be one or more of a triangle, a quadrilateral, a pentagon, a hexagon, or other shapes. As Figure 1As shown, for example, the grid may be a quadrilateral grid composed of four sides. There are nine such grids, which are interconnected through common sides to form a network structure. The vertex of a corner of the network structure can be used as the input end of the impedance matching circuit, and the vertex of another corner of the network structure can be used as the output end of the impedance matching circuit.

[0036] In one embodiment, an impedance element may be connected to each side of each of the grids through a wire. The impedance elements may be arranged in a matrix, for example, a 4×4 matrix. Each row of the matrix includes three impedance elements, and each column includes four impedance elements. At least two of the impedance elements have different impedance values, and the impedance elements may be at least one of the following: capacitor; inductor; capacitor and inductor; resistor and capacitor; resistor and inductor; resistor, capacitor and inductor. The input end, output end, wires and impedance elements may form multiple paths for audio and / or video signals flowing through the impedance matching circuit.

[0037] By configuring the number and impedance values of the impedance elements, at least two of the multiple signal paths of the impedance matching circuit have different impedance values, and according to the differences in specific audio-visual application circuits, the number and impedance values of the capacitors, inductors and resistors can also be configured differently so that each of the multiple signal paths has different impedance values. In this way, when audio and / or video signals with different frequencies and / or amplitudes flow through the impedance matching circuit, they can reach the output end along different paths with different impedance values from the input end, thereby achieving impedance matching between audio and / or video signals with different frequencies and / or amplitudes and the audio-visual application circuit, thus ensuring the signal is transmitted without distortion.

[0038] In one embodiment, some of the multiple impedance elements may be connected to form a filter circuit for filtering noise from the flowing audio and / or video signals with different frequencies and amplitudes. The filter circuit may, for example, include a low-pass filter circuit composed of a resistor and a capacitor, which is configured to filter high-frequency noise; or may also include a band-pass filter circuit composed of an inductor and a capacitor, which is configured to filter out-of-band noise of the band-pass filter circuit.

[0039] Figure 2 It is a two-dimensional structure diagram showing the impedance matching circuit 200 according to an embodiment of the present invention. Figure 2 The impedance matching circuit 200 in Figure 1 can be understood as Figure 1 an exemplary implementation of the impedance matching circuit 130 in Figure 2 . Therefore, the details of the impedance matching circuit 130 described in combination with

[0040] As shown Figure 2 in the figure, the structure of the impedance matching circuit may be a two-dimensional planar network structure composed of m rows and n columns. The impedance elements in the network structure may be arranged in a matrix, for example, it may be Figure 2 the m×n matrix shown in the figure, where m and n are positive integers greater than or equal to 2. Specifically, the first row of the m rows may include impedance elements ZX11, ZX12... ZX1(n - 1) and ZX1n arranged in sequence, the second row may include impedance elements ZX21, ZX22... ZX2(n - 1) and ZX2n arranged in sequence,... and so on. The mth row may include impedance elements ZXm1, ZXm2... ZXm(n - 1) and ZXmn arranged in sequence. The first column of the n columns may include impedance elements ZY11, ZY21... ZY(m - 1)1 and ZYm1 arranged in sequence, the second column may include impedance elements ZY12, ZY22... ZY(m - 1)2 and ZYm2 arranged in sequence,... and so on. The nth column may include impedance elements ZY1n, ZY2n... ZY(m - 1)n and ZYmn arranged in sequence.

[0041] In one embodiment, 4 of the impedance elements may be connected by wires to form a quadrilateral grid, and the grid includes sides and vertices. Further, the two-dimensional planar network structure may be formed by connecting the quadrilateral grids to each other, and adjacent grids have a common side. Specifically, as Figure 2 shown in the figure, the impedance elements ZX11, ZX21, ZY11, and ZY12 are sequentially connected by wires to form a quadrilateral grid; similarly, the impedance elements ZX12, ZX22, ZY12, and ZY13 are also sequentially connected by wires to form a quadrilateral grid. The above two grids have a common side including the impedance element ZY12, and the two grids are connected into a network structure through this common side.

[0042] In one embodiment, each grid has four vertices. The input end of the impedance matching circuit may be led out from any one vertex of the grid and is configured to receive the audio and / or video intermodulation signal input to the impedance matching circuit. The audio and / or video intermodulation signal may be output by an audio-video signal source or output from the inside of an audio-video application circuit. The output end of the impedance matching circuit may be led out from another vertex of the grid and is configured to output the audio and / or video signal after being processed by the impedance matching circuit. Further, there may be multiple input ends, and the output end may be one or more to meet the reception and output of multiple audio and / or video intermodulation signals. Specifically, for example, the input end may be Figure 2multiple of A, B, C, D, E, F, G, and H, the output terminal can be one or more of A to H, and the input terminal and the output terminal are different.

[0043] In one embodiment, the input terminal and the output terminal of the impedance matching circuit can be respectively connected to different vertices of the grid. In particular, the vertices can be located at the diagonals of the mesh structure so that the impedance elements between the input terminal and the output terminal form the most combinations, thereby achieving the purpose of more precisely performing impedance matching. For example, the input terminal is connected to terminal A and the output terminal is connected to terminal F; or the input terminal is connected to terminal B and the output terminal is connected to terminal E. By such an arrangement, the path that the signal flows through in the mesh structure can be made longer, or in other words, the impedance elements that the signal flows through are more, so as to realize more precise impedance matching of the audio and / or video signal.

[0044] In one embodiment, the input terminal, the output terminal, the wires, and the multiple impedance elements can form multiple signal paths for the signal flowing through the impedance matching circuit. Each of the multiple impedance elements can include at least one type of impedance element such as a capacitor or an inductor, and at least one or more impedance elements of this type can be included in the at least one type of impedance element; or each of the multiple impedance elements can also include at least two types of impedance elements among a capacitor, an inductor, and a resistor, and in each of the at least two types of impedance elements, at least one or more impedance elements of this type are included.

[0045] Furthermore, by configuring the number and impedance values of the impedance elements, at least two of the multiple signal paths of the audio and / or video signal flowing through the impedance matching circuit have different impedance values. And according to the differences of specific audio and video application circuits, the number and impedance values of the capacitor, inductor, and resistor can be configured differently so that each of the multiple audio and / or video signal paths has different impedance values. In one embodiment, the audio and / or video signal can include a composite signal composed of multiple harmonic signals with different frequencies and / or amplitudes, and each of the harmonic signals flows through one of the multiple paths from the input terminal to the output terminal, so as to perform impedance matching and timing adjustment on each of the harmonic signals, thereby ensuring that the audio and / or video signal is transmitted without distortion.

[0046] In one embodiment, some of the plurality of impedance elements may be connected to form a filtering circuit for performing noise filtering operations on signals of different frequencies and / or amplitudes flowing therethrough. The filtering circuit may include, for example, a low-pass filtering circuit composed of a resistor and a capacitor, which is configured to filter high-frequency noise; or may further include a band-pass filtering circuit composed of an inductor and a capacitor, which is configured to filter out-of-band noise of the band-pass filtering circuit.

[0047] Figure 3 is a three-dimensional structural diagram showing an impedance matching circuit 300 according to an embodiment of the present invention. Figure 3 The circuit 300 in Figure 1 can be understood as Figure 2 an exemplary implementation of the impedance matching circuit 130 in Figure 1 and Figure 2 can also be understood as Figure 3 an extended implementation of the impedance matching circuit 200 in

[0048] As Figure 2 an extended implementation of the impedance matching circuit 200 in Figure 2 The structure of the impedance matching circuit 300 of the present invention may be a three-dimensional network structure formed by sequentially connecting the network structures shown in

[0049] As Figure 3 shown, the structure of the impedance matching circuit 300 of the present invention may be a three-dimensional structure composed of three dimensions X, Y, and Z, where in the X dimension, it includes m rows, in the Y dimension, it includes n columns, and in the Z dimension, it includes t verticals. Each row in the X dimension is composed of impedance elements ZXmnt, each column in the Y dimension is composed of impedance elements ZYmnt, and each vertical in the Z dimension is composed of impedance elements ZZmnt, where m, n, and t are positive integers greater than or equal to 1. In particular, when m = n = t, the three-dimensional structure is a cube.

[0050] Specifically, in the X dimension, the first vertical element in the first row may include impedance elements ZX111, ZX121... ZX1(n - 1)1, and ZX1n1 arranged in sequence. The first vertical element in the second row may include impedance elements ZX211, ZX221... ZX2(n - 1)1, and ZX2n1 arranged in sequence,... and so on. The first vertical element in the m-th row may include impedance elements ZXm11, ZXm21... ZXm(n - 1)1, and ZXmn1 arranged in sequence. It can be understood that although the second, third... t-th vertical elements in the first row, the second, third... t-th vertical elements in the second row, and the second, third... t-th vertical elements in the third, fourth... m-th rows are not drawn in the figure, according to the above arrangement rules, the numbers and layout structures of these undrawn impedance elements can be obtained.

[0051] In the Y dimension, the first vertical element in the first column may include impedance elements ZY111, ZY211... ZY(m - 1)11, and ZYm11 arranged in sequence. The first vertical element in the second column may include impedance elements ZY121, ZY221... ZY(n - 1)21, and ZYn21 arranged in sequence,... and so on. The first vertical element in the n-th column may include impedance elements ZY1n1, ZY2n1... ZY(m - 1)n1, and ZYmn1 arranged in sequence. It can be understood that although the second, third... t-th vertical elements in the first column, the second, third... t-th vertical elements in the second column, and the second, third... t-th vertical elements in the third, fourth... m-th columns are not drawn in the figure, according to the above arrangement rules, the numbers and layout structures of these undrawn impedance elements can be obtained.

[0052] In the Z dimension, the m-th row in the first vertical element may include impedance elements ZZm11, ZZm21... ZZm(n - 1)1, and ZZmn1 arranged in sequence. The m-th row in the second vertical element may include impedance elements ZZm12, ZZm22... ZZm(n - 1)2, and ZZmn2 arranged in sequence,... and so on. The m-th row in the t-th vertical element may include impedance elements ZZm1t, ZZm2t... ZZm(n - 1)t, and ZZmnt arranged in sequence. It can be understood that although the first, second... (m - 1)-th rows in the first vertical element, the first, second... (m - 1)-th rows in the second vertical element, and the first, second... (m - 1)-th rows in the third, fourth... t-th vertical elements are not drawn in the figure, according to the above arrangement rules, the numbers and layout structures of these undrawn impedance elements can be obtained.

[0053] In one embodiment, the input end and the output end of the impedance matching circuit may be respectively connected to different vertices of the three-dimensional structure. Any two of the different vertices may be spaced apart from each other. In particular, the input end and the output end may be respectively connected to the diagonal vertices of the three-dimensional structure. For example, the input end is connected to vertex A and the output end is connected to vertex F; or the input end is connected to vertex C and the output end is connected to vertex G. Such an arrangement enables the impedance elements between the input end and the output end to form the most combinations, and further enables the path that the signal flows through in the three-dimensional structure to be longer, or in other words, the impedance elements that the signal flows through to be more, so as to perform more precise impedance matching on the audio and / or video signal.

[0054] In one embodiment, the input end, the output end, the wires, and the plurality of impedance elements may form a plurality of three-dimensional signal paths for the signal flowing through the impedance matching circuit. Each of the plurality of impedance elements may include: at least one type of reactance element such as a capacitor or an inductor, and at least one or more reactance elements of this type are included in the at least one type of impedance element; or each of the plurality of impedance elements may further include at least two types of impedance elements such as a capacitor, an inductor, and a resistor, and in each type of the at least two types of impedance elements, at least one or more impedance elements of this type are included.

[0055] Furthermore, by configuring the number and impedance values of the impedance elements, at least two of the plurality of three-dimensional signal paths of the audio and / or video signal flowing through the impedance matching circuit have different impedance values. And according to the differences of specific audio and video application circuits, the numbers and impedance values of the capacitor, the inductor, and the resistor can be configured differently, so that each of the plurality of audio and / or video signal paths has different impedance values. In one embodiment, the audio and / or video signal may include a composite signal composed of a plurality of harmonic signals with different frequencies and / or amplitudes. Each of the harmonic signals flows through one of the plurality of paths from the input end to the output end, so as to perform impedance matching and timing adjustment on each of the harmonic signals, thereby ensuring the distortion-free transmission of the audio and / or video signal.

[0056] In one embodiment, some of the plurality of impedance elements may be connected into a filtering circuit to perform noise filtering operations on signals with different frequencies and / or amplitudes flowing through. The filtering circuit may, for example, include a low-pass filtering circuit composed of a resistor and a capacitor, which is configured to filter high-frequency noise; or may further include a band-pass filtering circuit composed of an inductor and a capacitor, which is configured to filter out-of-band noise of the band-pass filtering circuit.

[0057] Figure 4It is an exemplary audio and / or video signal flow diagram showing an impedance matching circuit according to an embodiment of the present invention. It can be understood that Figure 4 the shown audio and / or video signal flow diagram is drawn based on Figure 2 the shown impedance matching circuit. Therefore Figure 4 the circuit structure in Figure 2 is the same as that in Figure 4 For the description of the impedance matching circuit in Figure 2 please refer to the relevant description in

[0058] As Figure 4 shown, audio and / or video signals of three different frequencies enter the mesh-structured impedance matching circuit from the input terminal D, then flow through different signal paths composed of different impedance elements, and finally output from the output terminal H. In order to distinguish audio and / or video signals of different frequencies, the three different frequency signals transmitted in the impedance matching circuit are represented by thick solid lines, thin solid lines, and dotted lines respectively. From Figure 4 it can be seen that the three different frequency audio and / or video signals represented by the thick solid line, thin solid line, and dotted line, although all enter from the input terminal and all output from the output terminal, flow through different signal paths in the impedance matching circuit. Since the number and impedance value of impedance elements on each path can be different, the total impedance value of each signal path is also different, thus realizing impedance matching for three different frequency audio and / or video signals respectively and ensuring distortion-free transmission of the signals.

[0059] In one embodiment, the audio and / or video signal input to the input terminal can be, for example, one or more composite signals, and the composite signal can be composed of a fundamental wave signal of a certain frequency and multiple harmonic signals of different frequencies. When the composite signal is input to the impedance matching circuit, the fundamental wave and harmonic signals of different frequencies can automatically select paths for transmission according to the different impedance values of the impedance elements, thus achieving the purpose of impedance matching for the fundamental wave and harmonic signals of different frequencies respectively. In addition, when the fundamental wave and harmonic signals of different frequencies flow through different types and numbers of impedance elements, the generated timings will be different. By setting a reasonable number and type of impedance elements, the timings of the fundamental wave and harmonic signals of different frequencies at the output terminal are kept consistent with their timings at the input terminal, so as to completely restore the composite signal at the output terminal.

[0060] In another embodiment, the audio and / or video signal input to the input terminal may also be harmonic signals of multiple different frequencies, where the multiple different-frequency harmonic signals respectively come from different synthesized signals; or the audio and / or video signal input to the input terminal may also be a combination of one or more synthesized signals and multiple different-frequency harmonic signals, where the harmonic signals respectively come from one or more other synthesized signals. The working principle is the same as the case where the signal input to the input terminal is one or more synthesized signals, and will not be elaborated here.

[0061] As a specific implementation, taking the Figure 4 audio and / or video signal flow of a local circuit in as an example, the principle of impedance matching of the impedance matching circuit for the audio and / or video signal will be described. As Figure 4 shown, taking the thick solid line path composed of ZX11, ZX21, ZX31, ZX32, ZY11, ZY12, ZY21, and ZY22 as an example. Further, for the convenience of description, ignoring the influence of this path on the timing of the audio and / or video signal, ZX11, ZX21, ZX31, and ZX32 can be set as resistors with a resistance value of 0. Additionally, ZY11, ZY12, and ZY21 are set as capacitor elements C, and ZY22 is set as a resistor element R. Assume that the value of ZY11 is 470uF, the value of ZY12 is 10uF, the value of ZY21 is 220uF, and the value of ZY22 is 1kΩ. Then, the audio and / or video signal flows from the input terminal A to the intersection of ZX32 and ZY23. The impedance value of this path is the combined impedance value after the parallel connection of 470uF and 10uF, and then the series connection with the parallel impedance value of 220u and 1k.

[0062] Obviously, on the one hand, by setting different capacitance values and resistance values, the path of the audio and / or video signal of different frequencies can be changed, thereby performing impedance matching on the audio and / or video signal of different frequencies. On the other hand, by setting different capacitance values and utilizing the timing response difference of the capacitor to the audio and / or video signal of different frequencies, the timing change of the audio and / or video signal of different frequencies can be adjusted to make the audio and / or video signal of different frequencies maintain timing consistency. Finally, after the audio and / or video signal flows through the above path, it can ensure its distortion-free transmission.

[0063] Figure 5 is a diagram showing another exemplary audio and / or video signal flow of the impedance matching circuit according to an embodiment of the present invention. It should be noted that, Figure 5 the shown audio and / or video signal flow diagram can be understood as Figure 4 an exemplary implementation of the shown audio and / or video signal flow diagram. Wherein Figure 5The frequencies of the three different audio and / or video signals in Figure 4 are the same as those of the three different audio and / or video signals in Figure 4 , and they correspond one by one. Different from the flow diagram of the audio and / or video signals in Figure 5 , the audio and / or video signals with different frequencies shown in Figure 4 are different in amplitude from the audio and / or video signals with corresponding frequencies in

[0064] As Figure 5 shown, in one embodiment, three audio and / or video signals with different frequencies enter the impedance matching circuit of the mesh structure from the input end D, then flow through different signal paths composed of impedance elements, and finally output from the output end H. By comparing with Figure 4 , it can be obtained that Figure 5 the signal paths of the three different frequency signals in Figure 4 are not exactly the same as those in Figure 5 because the three different frequency signals in Figure 4 are different in amplitude from the three corresponding different frequency signals in

[0065] Figure 6 is a schematic structural diagram of an audio-visual signal processing device 600 in which the impedance matching circuit according to an embodiment of the present invention is located before the audio-visual application circuit. For a better understanding of the structure and function of the audio-visual signal processing device 600 of the present invention, Figure 6 also shows an audio-visual signal source and a load, where the audio-visual signal source is configured to generate and output audio and / or video signals, and the load is configured to receive the audio and / or video signals processed and output by the audio-visual signal processing device 600.

[0066] As Figure 6As shown, in one embodiment, the impedance matching circuit 620 may be arranged before the audio-video application circuit 630. Specifically, the impedance matching circuit may be arranged between the audio-video application circuit and the power supply circuit 610. The input terminal D of the impedance matching circuit may be connected to one end of the power supply circuit and the audio-video application circuit respectively, and the output terminal H of the impedance matching circuit may be connected to the other end of the power supply circuit and the audio-video application circuit respectively, so as to form a loop with impedance matching for audio and / or video intermodulation signals of different frequencies and / or amplitudes between the impedance matching circuit and the audio-video application circuit, and to form a loop with impedance matching for power supply signals of different frequencies and / or amplitudes between the impedance matching circuit and the power supply circuit.

[0067] Optionally, according to the different structures of the impedance matching circuit, the input terminal of the impedance matching circuit may also be vertices A and B, the output terminal may also be vertices E and F, or any other vertices. In particular, according to the different requirements of the audio-video application circuit, on the premise of ensuring that the input terminal and the output terminal are connected to different vertices, the input terminal may be used as the output terminal, and the output terminal may be used as the input terminal.

[0068] In one embodiment, the audio-video application circuit may be, for example, but not limited to, an audio-video preamplifier, an audio-video power amplifier, an audio-video acquisition circuit, an A / D conversion circuit, a D / A conversion circuit, and an audio-video mixer, etc. The audio-video signal source may be, for example, but not limited to, a CD, a mobile phone, an MP3, a medical device, a test instrument, a sports equipment, etc., which can output audio and / or video signals. The load may be, for example, but not limited to, a speaker or other audio-video circuits or devices. The working principle of the audio-video signal processing device 600 of the present invention will be briefly described below.

[0069] On the one hand, the power supply circuit outputs a power supply signal to the audio-video application circuit through the impedance matching circuit for power supply. When the power supply signal passes through the impedance matching circuit, it will first be filtered, regulated or current-limited by the impedance matching circuit, so as to provide a stable working voltage or current for the audio-video application circuit. In addition, through the processing of the power supply signal by the impedance matching circuit, a loop with impedance matching for power supply signals of different frequencies and / or amplitudes is formed between the impedance matching circuit and the power supply circuit, so as to match the internal resistance of the power supply circuit and the impedance of the audio-video application circuit.

[0070] On the other hand, an audio-video signal source generates and outputs an audio and / or video intermodulation signal to an audio-video application circuit. The audio and / or video intermodulation signal includes fundamental wave and harmonic signals of multiple frequencies and / or amplitude components. Then, after these fundamental wave and harmonic signals are processed such as amplified, isolated, or reduced in the audio-video application circuit, they flow into the impedance matching circuit through the H terminal. In the impedance matching circuit, the fundamental wave and harmonic signals of different frequencies and / or amplitude components automatically select paths for transmission according to different impedance values and are output from the D terminal, and finally flow to the load for playback or further processing. In this way, through the processing of the impedance matching circuit for the audio and / or video intermodulation signal, a loop with impedance matchable for the audio and / or video intermodulation signal of different frequencies and / or amplitudes is formed between the impedance matching circuit, the audio-video application circuit, and the load, thereby performing impedance matching and timing adjustment on the audio and / or video intermodulation signal. Finally, the audio and / or video signal output by the audio-video signal source is transmitted to the load without distortion.

[0071] Figure 7 FIG. 4 is another schematic structural diagram of an audio-video signal processing apparatus 700 in which the impedance matching circuit according to an embodiment of the present invention is located before the audio-video application circuit. For a better understanding of the structure and function of the audio-video signal processing apparatus 700 of the present invention, Figure 7 the audio-video signal source and the load are also drawn in FIG. 4, where the audio-video signal source is configured to generate and output an audio and / or video signal, and the load is configured to receive the audio and / or video signal processed and output by the audio-video signal processing apparatus 700.

[0072] As Figure 7 shown, in one embodiment, a power supply circuit 710 is connected to the audio-video application circuit 730 through an impedance matching circuit 720 for power supply. The audio-video signal source is connected to the audio-video application circuit through an impedance matching circuit 721 for impedance matching and timing adjustment of the audio and / or video signal output by the audio-video signal source. Specifically, the input terminals A and B of the impedance matching circuit 721 are connected to the audio-video signal source and are used to receive the audio and / or video intermodulation signal generated and output by the audio-video signal source. The output terminals E and F of the impedance matching circuit are connected to the audio-video application circuit and are used to output the audio and / or video signal processed by it to the audio-video application circuit.

[0073] Optionally, depending on the structure of the impedance matching circuit, the input and output terminals of the impedance matching circuits 720 and 721 may also be vertices D and H or any other arbitrary vertices with respect to the audio-video signal source. In particular, depending on the requirements of the audio-video application circuit, on the premise that the input and output terminals are connected to different vertices, the input terminal may be used as the output terminal, and the output terminal may be used as the input terminal.

[0074] In one embodiment, the audio-video application circuit may be, for example, but not limited to, an audio-video pre-amplifier, an audio-video power amplifier, an audio-video acquisition circuit, an A / D conversion circuit, a D / A conversion circuit, and an audio-video mixer, etc. The audio-video signal source may be, for example, but not limited to, a CD, a mobile phone, an MP3, a medical device, a sports equipment, etc., which are devices or systems capable of outputting audio and / or video signals. The load may be, for example, but not limited to, a speaker or other audio-video circuits or devices. The working principle of the audio-video signal processing apparatus 700 of the present invention will be briefly described below.

[0075] On the one hand, the power supply circuit outputs a power supply signal to the audio-video application circuit through the impedance matching circuit 720 for power supply. When the power supply signal passes through the impedance matching circuit 720, it will first be filtered, regulated or current-limited by the impedance matching circuit 720, so as to provide a stable working voltage or current for the audio-video application circuit. In addition, through the processing of the impedance matching circuit 720 on the power supply signal, a loop with impedance matching for power supply signals of different frequencies and / or amplitudes is formed between the impedance matching circuit 720 and the power supply circuit, thereby matching the internal resistance of the power supply circuit and the impedance of the audio-video application circuit.

[0076] On the other hand, the audio-video signal source generates and outputs an audio and / or video intermodulation signal to the impedance matching circuit 721. The audio and / or video intermodulation signal includes fundamental wave and harmonic signals with multiple frequencies and / or amplitudes. Then, these fundamental wave and harmonic signals flow into the impedance matching circuit 721 through the input terminals A and B, and automatically select a transmission path for transmission according to different impedance values. Subsequently, the audio and / or video signals after being matched and processed by the impedance matching circuit 721 are output from the output terminals E and F of the impedance matching circuit 721 and flow to the audio-video application circuit. At the same time, the audio and / or video signals of the audio-video application circuit can also flow to the impedance matching circuit 721 for impedance matching processing.

[0077] Finally, after the audio and video application circuit processes the received audio and / or video signals, such as amplification, isolation, or reduction, it outputs them to the load for playback or further processing. Through the processing of the above process, the audio and video signal processing device matches the impedance of the audio and video signal source with the impedance of the audio and video application circuit through the impedance matching circuit 721, and also matches the impedance of the audio and video application circuit with the impedance of the load. Finally, the audio and / or video signals output by the audio and video signal source are transmitted to the load without distortion.

[0078] Figure 8 It is a schematic connection diagram showing the impedance matching circuit and the signal transformer according to an embodiment of the present invention. As Figure 8 shown, the signal transformer may include a primary coil, a secondary coil, and an iron core, where the primary coil is used to receive audio and / or video signals, and the secondary coil is used to output the processed audio and / or video signals. The signal transformer may be arranged Figure 6 between the audio and video signal source in

[0079] Specifically, in connection method one, the input terminal G of the impedance matching circuit 811 is connected to the negative pole of the primary coil of the signal transformer 821, and the output terminal C is connected to the negative pole of the secondary coil of the signal transformer 821, so as to perform impedance matching and timing adjustment on the audio and / or video signals input to the signal transformer 821, so that the audio and / or video signals are output without distortion in the secondary coil of the signal transformer 821.

[0080] In connection method two, the input terminal G of the impedance matching circuit 812 is connected to the center tap N of the primary coil of the signal transformer 822, and the output terminal C is connected to the center tap N of the secondary coil of the signal transformer 822, so as to perform impedance matching and timing adjustment on the audio and / or video signals input to the signal transformer 822, so that the audio and / or video signals are output without distortion in the secondary coil of the signal transformer 822.

[0081] In connection method three, the input terminal G of the impedance matching circuit 813 is connected to the negative pole of the primary coil of the signal transformer 823, and the output terminal C is connected to the center tap N of the secondary coil of the signal transformer 823, so as to perform impedance matching and timing adjustment on the audio and / or video signals input to the signal transformer 823, so that the audio and / or video signals are output without distortion in the secondary coil of the signal transformer 823. Optionally, in the above three connection methods, the input and output terminals of the impedance matching circuit may also be any other vertices, for example, vertices D and H.

[0082] Figure 9It is a schematic diagram showing the connection of an impedance matching circuit and an audio-video signal line according to an embodiment of the present invention. Among them Figure 9 The connection method can be applied to Figure 6 between the audio-video signal source and the audio-video application circuit in Figure 9 Only three connection methods are listed in

[0083] Specifically, in the one-end connection method, both the audio-video signal input line and the output line are one. Among them, the core of the audio-video signal input line is connected to the input terminal A of the impedance matching circuit, and the protective line of the audio-video signal input line is connected to the input terminal C of the impedance matching circuit. The core of the audio-video signal output line is connected to the output terminal E of the impedance matching circuit, and the protective line of the audio-video signal output line is connected to the input terminal G of the impedance matching circuit. The input terminal C and the output terminal G of the impedance matching circuit can be internally connected and grounded. Through such a connection, the audio and / or video signals output by the audio-video signal input line, after passing through the impedance matching process of the impedance matching circuit, output the audio and / or video signals without distortion on the audio-video signal output line.

[0084] In the two-end connection method, both the audio-video signal input line and the output line are two. Among them, the cores of the two audio-video signal input lines are respectively connected to the input terminals A and B of the impedance matching circuit, and the protective lines of the two audio-video signal input lines are commonly connected to the input terminal C of the impedance matching circuit. The cores of the two audio-video signal output lines are connected to the output terminals E and F of the impedance matching circuit, and the protective lines of the two audio-video signal output lines are commonly connected to the input terminal G of the impedance matching circuit. The input terminal C and the output terminal G of the impedance matching circuit can be internally connected and grounded. Through such a connection, the audio and / or video signals output by the audio-video signal input line, after passing through the impedance matching process of the impedance matching circuit, output the audio and / or video signals without distortion on the audio-video signal output line.

[0085] In the three-terminal connection method, both the audio-video signal input line and the output line include a positive terminal 2, a negative terminal 3, and a ground terminal 1. Among them, the positive terminal 2, the negative terminal 3, and the ground terminal 1 of the audio-video signal input line are respectively connected to the input terminals A, B, and C of the impedance matching circuit. The positive terminal 2, the negative terminal 3, and the ground terminal 1 of the audio-video signal output line are respectively connected to the output terminals E, F, and G of the impedance matching circuit. The input terminal C and the output terminal G of the impedance matching circuit can be internally connected and grounded. Through such a connection, the audio and / or video signals output by the audio-video signal input line are output without distortion on the audio-video signal output line after passing through the impedance matching process of the impedance matching circuit.

[0086] Figure 10 FIG. is a schematic structural diagram of an audio-video signal processing apparatus 1000 in which an impedance matching circuit according to an embodiment of the present invention is located inside an audio-video application circuit. To better understand the structure and function of the audio-video signal processing apparatus 1000 of the present invention, Figure 10 an audio-video signal source and a load are also drawn, where the audio-video signal source is configured to generate and output audio and / or video signals, and the load is configured to receive the audio and / or video signals processed and output by the audio-video signal processing apparatus 1000.

[0087] As Figure 10 shown, in one embodiment, the audio-video application circuit 1010 may include an input stage 1011, an output stage 1012, and a feedback terminal 1013. The impedance matching circuit 1020 may be arranged inside the audio-video application circuit. Further, the impedance matching circuit may be arranged in at least one of the input stage, the output stage, and the feedback terminal.

[0088] Specifically, the impedance matching circuit may be arranged in the input stage of the audio-video application circuit to perform impedance matching and timing adjustment on the audio and / or video intermodulation signals at the input stage of the audio-video application circuit. The impedance matching circuit may also be arranged in the output stage of the audio-video application circuit to perform impedance matching and timing adjustment on the audio and / or video intermodulation signals at the output stage of the audio-video application circuit. The impedance matching circuit may also be arranged in the feedback terminal of the audio-video application circuit to perform impedance matching and timing adjustment on the audio and / or video intermodulation signals at the feedback terminal of the audio-video application circuit.

[0089] It can be understood that although Figure 10The audio and video application circuit in [the figure] only shows the input stage, output stage, and feedback terminal. However, based on the disclosure and teachings of the present invention, those skilled in the art can conceive that the audio and video application circuit may further include other structures or units through which audio and / or video intermodulation signals flow, such as a coupling terminal. And the impedance matching circuit can be arranged at the coupling terminal to perform impedance matching and timing adjustment on the audio intermodulation signal at the coupling terminal. Figure 11 FIG. [the figure] is a schematic structural diagram of an audio and video signal processing apparatus 1100 showing that the impedance matching circuit according to an embodiment of the present invention is located at the input stage and output stage of the audio and video application circuit. It can be understood that, Figure 11 the shown audio and video signal processing apparatus 1100 is Figure 10 an exemplary circuit implementation of the shown audio and video signal processing apparatus 1000. Therefore, the above description of Figure 10 the audio and video signal processing apparatus 1000 in [the figure] also applies to Figure 11 the description of the audio and video signal processing apparatus 1100 in [the figure].

[0090] As Figure 11 shown, the audio and video signal processing apparatus 1100 of the present invention may include a two-stage amplification circuit composed of a first electron tube 1121, a second electron tube 1122, and other auxiliary components. Wherein the first electron tube constitutes the input stage 1131 of the two-stage amplification circuit, and the second electron tube constitutes the output stage 1132 of the two-stage amplification circuit. Further, an impedance matching circuit 1111 is arranged at the input stage of the amplification circuit, and an impedance matching circuit 1112 is arranged at the output stage of the amplification circuit.

[0091] Specifically, at the input stage of the two-stage amplification circuit, the input terminal D of the impedance matching circuit 1111 is connected to the cathode of the first electron tube, and the output terminal H of the impedance matching circuit 1111 is grounded. In this way, an audio and / or video intermodulation signal loop composed of the first electron tube, the impedance matching circuit 1111, capacitors, resistors, etc. is formed at the input stage of the two-stage amplification circuit. During the operation of the audio and video signal processing apparatus, the audio and / or video signal Vi is input into the first electron tube through a resistor, then flows through the loop, and is subjected to impedance matching and timing adjustment through the impedance matching circuit 1111, finally realizing the distortion-free transmission of the audio and / or video signal at the input stage.

[0092] Further, at the output stage of the second-stage amplification circuit, the input end D of the impedance matching circuit 1112 is connected to the cathode of the second electron tube, and the output end H of the impedance matching circuit 1112 is grounded. In this way, an audio and / or video intermodulation signal loop composed of the second electron tube, the impedance matching circuit 1112, capacitors, resistors, etc. is formed at the output stage of the second-stage amplification circuit. During the operation of the audio-video signal processing device, the audio and / or video signals output by the input stage of the second-stage amplification circuit enter the second electron tube, then flow through the loop, and are impedance-matched and timing-adjusted by the impedance matching circuit 1112, and finally the audio and / or video signals are transmitted to the signal transformer without distortion.

[0093] Figure 12 FIG. is a schematic structural diagram of an audio-video signal processing device 1200 in which an impedance matching circuit according to an embodiment of the present invention is located at the input stage and the feedback end of an audio-video application circuit. It can be understood that Figure 12 the shown audio-video signal processing device 1200 is Figure 10 an exemplary circuit implementation of the shown audio-video signal processing device 1000. Therefore, the above description of Figure 10 the audio-video signal processing device 1000 in Figure 12 also applies to the description of the audio-video signal processing device 1200 in

[0094] As Figure 12 shown, the audio-video signal processing device 1200 of the present invention may include an amplification circuit composed of an amplifier AMP, a load, and other auxiliary components such as resistors and capacitors. The amplifier may be, for example, an integrated operational amplifier or a power amplifier, and a negative feedback loop is formed through a resistor. The load may be, for example, a speaker RL, other circuits or devices. The input end of the amplifier AMP and other auxiliary components constitute the input stage 1211 of the amplification circuit, and the feedback loop of the amplifier AMP constitutes the feedback end 1212 of the amplification circuit. An impedance matching circuit 1221 is connected to the input stage of the amplification circuit, and an impedance matching circuit 1222 is connected to the feedback end of the amplification circuit.

[0095] Specifically, at the input stage of the amplification circuit, the input end D of the impedance matching circuit 1221 is connected to port 1 of the amplifier AMP through a resistor, and the output end H of the impedance matching circuit 1221 is grounded. In this way, at the input stage of the amplification circuit, an audio and / or video intermodulation signal loop composed of the amplifier AMP, the impedance matching circuit 1221, capacitors, resistors, etc. is formed. During the operation of the audio-video signal processing device, the audio and / or video signal Vi is input into port 1 of the amplifier AMP through a capacitor, then flows through the audio and / or video intermodulation signal loop, and its impedance is matched and its timing is adjusted through the impedance matching circuit 1221. Finally, the audio and / or video signal is transmitted without distortion at the input stage of the amplification circuit.

[0096] Further, at the feedback end of the amplification circuit, the input end D of the impedance matching circuit 1222 is connected to port 2 of the amplifier AMP through a resistor, and the output end H of the impedance matching circuit 1222 is grounded. In this way, at the feedback end of the amplification circuit, an audio and / or video intermodulation signal loop composed of the amplifier AMP, the impedance matching circuit 1222, and resistors, etc. is formed. During the operation of the audio-video signal processing device, the audio and / or video signal output from the input stage of the amplification circuit flows through the loop after being processed by the amplifier AMP, and its impedance is matched and its timing is adjusted through the impedance matching circuit 1222. Finally, the audio and / or video signal is output to the load without distortion.

[0097] Figure 13 FIG. is a schematic structural diagram of an audio-video signal processing device 1300 including a plurality of impedance matching circuits and a plurality of audio-video application circuits according to an embodiment of the present invention. It can be understood that Figure 13 the shown audio-video signal processing device 1300 may include a plurality of Figure 6 the shown audio-video signal processing device 600, or may further include a plurality of Figure 7 the shown audio-video signal processing device 700.

[0098] Further, the power supply circuit 1310 can provide multiple power supply signals and supply power to a plurality of audio-video application circuits 1330 through the impedance matching circuit 1320. The impedance matching circuit 1320 can be one or more. When the impedance matching circuit 1320 is one, it can include a plurality of input ends and output ends. For example, the plurality of input ends and output ends can be Figure 13Vertices A to R therein. The impedance matching circuit 1321 can be one or more. When there is one impedance matching circuit 1321, it performs impedance matching and timing adjustment on the multiple audio-video application circuits respectively. Additionally, the multiple audio-video application circuits can be an integrated structure for processing audio and / or frequency signals for specific functions; the multiple audio-video application circuits can also be a split structure, where each audio-video application circuit is used for processing audio and / or frequency signals with different functions.

[0099] It should be understood that the terms "first", "second", "third", "fourth", etc. in the claims, the description and the drawings of the present invention are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "including" used in the description and claims of the present invention indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0100] It should also be understood that the terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the description and claims of the present invention, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms. It should be further understood that the term "and / or" used in the description and claims of the present invention refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0101] As used in this specification and the claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0102] Although the embodiments of the present invention are as above, the above content is only an example for facilitating the understanding of the present invention, and is not intended to limit the scope and application scenarios of the present invention. Any person skilled in the art within the technical field of the present invention can make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. An audio - video signal processing device, comprising: An audio - video application circuit configured to receive, process, and output audio and / or video inter - modulation signals; A power supply circuit configured to output a power supply signal to the audio - video application circuit for powering it; At least two impedance matching circuits, where each impedance matching circuit includes: A plurality of impedance elements, the plurality of impedance elements forming a mesh structure including at least one mesh, the mesh having sides and vertices and at least one side being formed by at least one impedance element; At least one input terminal, where each input terminal is connected to a vertex in the at least one mesh; and At least one output terminal, where each output terminal is connected to another vertex in the at least one mesh; An audio - video signal source; Wherein, the power supply circuit and the audio - video signal source are respectively connected to the audio - video application circuit through at least one of the at least two impedance matching circuits, The input terminal of the impedance matching circuit between the power supply circuit and the audio - video application circuit is used to receive the power supply signal, and the output terminal is used to provide a stable operating voltage or current to the audio - video application circuit; The input terminal of the impedance matching circuit between the audio - video signal source and the audio - video application circuit is used to receive the audio and / or video inter - modulation signals generated and output by the audio - video signal source, and the output terminal is used to output the audio and / or video inter - modulation signals processed by the impedance matching circuit to the audio - video application circuit; so that an impedance - matchable loop is formed between the impedance matching circuit and the audio - video application circuit and between the impedance matching circuit and the power supply circuit for audio and / or video inter - modulation signals and power supply signals of different frequencies and / or amplitudes.

2. The apparatus according to claim 1, wherein, The impedance values of at least two of the plurality of impedance elements are different, so that signals of different frequencies and / or amplitudes in the audio and / or video inter - modulation signals and the power supply signals pass through different paths in the mesh structure.

3. The device according to claim 1, wherein, The impedance element is at least one of the following: capacitor; inductor; capacitor and inductor; resistor and capacitor; resistor and inductor; and resistor, capacitor, and inductor.

4. The device according to claim 1, wherein, An impedance matching circuit is arranged inside the audio - video application circuit.

5. The device according to claim 4, wherein, The impedance matching circuit arranged inside the audio - video application circuit includes the impedance matching circuit arranged at the input stage of the audio - video application circuit, so that an impedance - matchable loop is formed between the impedance matching circuit and the input stage of the audio - video application circuit for audio - video inter - modulation signals of different frequencies and / or amplitudes.

6. The device according to claim 4, wherein The impedance matching circuit arranged inside the audio - video application circuit further includes the impedance matching circuit arranged at the output stage of the audio - video application circuit, so that an impedance - matchable loop is formed between the impedance matching circuit and the output stage of the audio - video application circuit for audio - video inter - modulation signals of different frequencies and / or amplitudes.

7. The apparatus according to claim 4, wherein The impedance matching circuit is arranged inside the audio-video application circuit and further includes the impedance matching circuit arranged at the feedback end of the audio-video application circuit, so that a loop with impedance matching for audio-video intermodulation signals of different frequencies and / or amplitudes is formed between the impedance matching circuit and the feedback end of the audio-video application circuit.

8. The device according to any one of claims 1 to 7, wherein, There are multiple audio-video application circuits, the power supply circuit outputs multiple power supply signals to supply power to the multiple audio-video application circuits respectively, and there are multiple impedance matching circuits.

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