CN110855262A - System and method for realizing multi-type audio output impedance - Google Patents
System and method for realizing multi-type audio output impedance Download PDFInfo
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- CN110855262A CN110855262A CN201911107102.2A CN201911107102A CN110855262A CN 110855262 A CN110855262 A CN 110855262A CN 201911107102 A CN201911107102 A CN 201911107102A CN 110855262 A CN110855262 A CN 110855262A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a system and a method for realizing multi-type audio output impedance, comprising the following steps: the relay comprises a plurality of double-channel relays connected in series, wherein a P channel and an N channel of each double-channel relay respectively comprise two switches with a common end; a plurality of resistors with set resistance values are connected between two adjacent double-channel relays; the connection between the two-channel relays and the series connection or parallel connection of the set resistors are realized by controlling the on-off of the switches of the P channel and the N channel in the two-channel relays, and finally the required impedance value is output. The invention uses a small amount of standard resistance values to realize various impedance interfaces, thereby realizing the reutilization of the matching circuit; and flexible control logic is adopted to drive the switching of the relay, so that the method is simple and convenient.
Description
Technical Field
The invention relates to the technical field of audio analyzers, in particular to a system and a method for realizing multi-type audio output impedance.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The audio analyzer is widely applied and can effectively analyze the audio amplifier and other elements in an audio chain. The audio output impedance is an important parameter of an audio analyzer. Because the audio output interfaces are different, the application fields are different from the tested equipment, the audio output impedance needs to be matched by various types, the amplitude of an output signal is inconsistent with the measured value due to impedance mismatching, the experiment failure is caused, and the scientific research accident is also caused seriously; therefore, a matching circuit is required for each impedance.
An impedance design circuit in the existing audio analyzer mainly adopts the steps that signals are generated and then input into different impedance matching circuits, and then are input into different impedance interfaces through a relay switch, and the reference is made to fig. 1; the audio impedance matching circuit is generally designed to be independent of each type of impedance matching circuit, so that the circuit size is large, the PCB layout area is increased, and the impedance switching circuit is complex.
Disclosure of Invention
In order to solve the above problems, the present invention provides a system and a method for implementing multi-type audio output impedance, which can implement a matching circuit to satisfy the switching of nearly ten kinds of impedance, simplify the design, and reduce the layout of PCB.
In some embodiments, the following technical scheme is adopted:
a system for implementing multiple types of audio output impedances, comprising: the relay comprises a plurality of double-channel relays connected in series, wherein a P channel and an N channel of each double-channel relay respectively comprise two switches with a common end; a plurality of resistors with set resistance values are connected between two adjacent double-channel relays; the connection between the two-channel relays and the series connection or parallel connection of the set resistors are realized by controlling the on-off of the switches of the P channel and the N channel in the two-channel relays, and finally the required impedance value is output.
As a further improvement, the output end of the impedance value is sequentially connected in series with two double-channel relays, wherein a P channel and an N channel of one double-channel relay are respectively connected with an unbalanced interface, and the output of one of the P channel and the N channel is grounded; and the P channel and the N channel of the other double-channel relay are respectively connected with the balance interface.
The on-off of the switches of the P channel and the N channel in the dual-channel relay is controlled, and the impedance values output by the P channel and the N channel after the dual-channel relay is connected in series are equal by setting the series connection or the parallel connection of resistors; the output of balanced impedance values or common mode impedance is realized.
As a further improvement, the on-off of a switch of one channel in the dual-channel relay is controlled, and after the dual-channel relay is connected in series, the corresponding channel outputs a set impedance value and the output of the other channel is grounded through the series connection or the parallel connection of the set resistors, so that the output of unbalanced impedance is realized.
In other embodiments, the following technical solutions are adopted:
a method of implementing a multi-type audio output impedance, comprising:
connecting a plurality of double-channel relays in series;
a plurality of resistors with set resistance values are connected between two adjacent double-channel relays;
the on-off of the switches of the P channel and the N channel in the dual-channel relay is controlled simultaneously, so that the connection between the dual-channel relays and the series connection or parallel connection of the set resistors are realized, and finally, the required impedance value is output.
As further improvement, the on-off of the switches of the P channel and the N channel in the dual-channel relay is controlled at the same time, and the impedance values output by the P channel and the N channel after the dual-channel relay is connected in series are equal by setting the series connection or the parallel connection of resistors; the output of balanced impedance values or common mode impedance is realized.
As a further improvement, the on-off of a switch of one channel in the dual-channel relay is controlled, and after the dual-channel relay is connected in series, the corresponding channel outputs a set impedance value and the output of the other channel is grounded through the series connection or the parallel connection of the set resistors, so that the output of unbalanced impedance is realized.
Compared with the prior art, the invention has the beneficial effects that:
the invention uses a small amount of standard resistance values to realize various impedance interfaces, thereby realizing the reutilization of the matching circuit; and flexible control logic is adopted to drive the switching of the relay, so that the method is simple and convenient.
The invention can switch between different impedance values flexibly and is easy to realize; the repeated utilization of the matching resistor is realized, and the complexity of the matching circuit is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional impedance matching generation system according to the present invention;
fig. 2 is a multi-type audio output impedance implementation system according to an embodiment of the invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, a system is disclosed for implementing multiple types of audio output impedances, comprising: the system comprises a plurality of double-channel relays connected in series, wherein a P channel and an N channel of each double-channel relay respectively comprise two switches with a common end; two paths are switched on or off simultaneously, and a plurality of resistors with set resistance values are connected between two adjacent double-channel relays; the connection between the two-channel relays and the series connection or parallel connection of the set resistors are realized by controlling the on-off of the switches of the P channel and the N channel in the two-channel relays, and finally the required impedance value is output.
The output end of the impedance value is sequentially connected with two double-channel relays in series, a P channel and an N channel of one double-channel relay are respectively connected with the unbalanced interface, and the output of one of the P channel and the N channel is grounded; and the P channel and the N channel of the other double-channel relay are respectively connected with the balance interface.
The on-off of the switches of the P channel and the N channel in the dual-channel relay is controlled, and the impedance values output by the P channel and the N channel after the dual-channel relay is connected in series are equal by setting the series connection or the parallel connection of resistors; the output of balanced impedance values or common mode impedance is realized.
The on-off of a switch of one channel in the dual-channel relay is controlled, and after the dual-channel relay is connected in series, the corresponding channel outputs a set impedance value and the output of the other channel is grounded through the series connection or the parallel connection of the set resistors, so that the output of unbalanced impedance is realized.
The embodiment of the invention uses 7 dual-channel relays (K1-K7) and 4 resistors, completes the circuit switching of 9 impedances and the turn-off of signal output, and switches the relay switch to the left and right directions. The audio output impedance of the required type is realized through resistor series-parallel connection and multiplexing, and the audio output impedance matching circuit is simplified.
For convenience of description of the circuit structure, in this embodiment, for two switches having a common end for the P channel and the N channel, two channels are simultaneously turned on or off, and three connection ends of the two switches are respectively described as: common, left and right ends; and closing the left end switch to realize the connection of the left end and the common end, and closing the right end switch to realize the connection of the right end and the common end.
The specific structure of the system for implementing multi-type audio output impedance disclosed in this embodiment refers to fig. 2, which includes: 7 dual-channel relays (K1-K7) connected in series, wherein in the dual-channel relay K1, the left end of a P channel is grounded, the right end of the P channel is connected with a 20 omega resistor and then connected to the right end of the P channel of the dual-channel relay K2, the middle end of the P channel is divided into two paths, and two paths of outputs are respectively connected with the left end of the channel of the dual-channel relay K2P and the left end of the channel of the N channel after being respectively connected with the 20 omega resistor; the left end, the middle end and the right end of the N channel of the double-channel relay K1 are all suspended.
In the dual-channel relay K2, in addition to the connection with the dual-channel relay K1, the right end of the P channel is connected with a 20 omega resistor; the middle end of the P channel is connected with a 580 omega resistor and then is respectively communicated with the middle ends of the P channels of the two-channel relays K3-K6; the middle end of the P channel is also respectively connected with the left end of the P channel of the dual-channel relay K3, the left end of the P channel of the dual-channel relay K4 after passing through a 33.6 omega resistor, the left end of the P channel of the dual-channel relay K5 after passing through a 541 omega resistor, and the right end of the P channel of the dual-channel relay K3-K6 is suspended; the connection of the N channel of the dual-channel relay K2-K6 is symmetrical to the P channel, and the description is omitted.
In the dual-channel relay K6, the left ends of a P channel and an N channel are respectively connected with a balanced XLR interface (a balanced interface is called in the patent for short), and the right ends of the P channel and the N channel are respectively connected with the left ends of corresponding channels of the dual-channel relay K7; in the dual-channel relay K7, the middle ends of the P channel and the N channel are respectively connected to an unbalanced BNC interface (referred to as an unbalanced interface for short in this patent), and the right end of the N channel is grounded.
In the embodiment, the 20 ohm impedances of R1, R2, R3 and R4 are determined by balancing 40 ohm impedances, the 580 ohm values of R5 and R6 are obtained by unbalanced 600 ohm, then the balancing 600 ohm requires 20 ohm plus 280 ohm at each end, the balancing 280 ohm requires that R9 and R10 are 541 ohm by connecting 580 ohm in parallel with the other resistance value, finally, the balancing 100 ohm requires 20 ohm plus 30 ohm at each end, the 30 ohm is three parallel values of R5, R7 and R9, and finally, the R7 and R8 are 33.6 ohm. Of course, those skilled in the art can select other combinations of resistors with different resistances based on the design concept of the present invention.
With the above system structure, the switch switching logic and the output impedance are of the following types:
(1) switch off
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the left end is closed, and the left end is closed.
(2) Unbalanced 600 Ω
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value is that resistors R2 and R5 are connected in series, and one end of the unbalanced interface is output and the other end is grounded. At this time, unbalanced 600 Ω impedance is output.
(3) Unbalanced 50 Ω
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value is that resistors R5, R7 and R9 are connected in parallel and then connected in series with a resistor R1, and one output end of the unbalanced interface is grounded. At this time, unbalanced 50 Ω impedance is output.
(4) Unbalanced 20 Ω
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value is R1, and the output end of the unbalanced end is grounded. At this time, unbalanced 20 Ω impedance is output.
(5) Balance 600 omega
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value P channel is that resistors R5 and R9 are connected in parallel and then connected with a resistor R1 in series. The N channel is formed by connecting resistors R6 and R10 in parallel and then connecting the resistors R4 in series, the two channels are respectively 300 omega, and the phase difference is 180 degrees. At this time, the output balances the 600 Ω impedance.
(6) Balance 100 omega
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value P channel is that resistors R5, R7 and R9 are connected in parallel and then connected in series with a resistor R1. The N channel is formed by connecting resistors R6, R8 and R10 in parallel and then connecting the resistors R4 in series, and the two channels are respectively 50 omega and have a phase difference of 180 degrees. At this time, the output balances the 100 Ω impedance.
(7) Balance 40 omega
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the method comprises the steps of right end closing, left end closing, right end closing, left end closing and left end closing, wherein the P channel of the impedance value is a resistor R1, the N channel is a resistor R4, the two channels are 20 omega respectively, and the phase difference is 180 degrees. At this time, the output balances the 20 Ω impedance.
(8) Common mode 600 omega
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value P channel is that resistors R5 and R9 are connected in parallel and then connected with a resistor R2 in series. The N channel is formed by connecting resistors R6 and R10 in parallel and then connecting the resistors R3 in series, and the two channels are respectively 300 omega and have the same phase. At this time, a common mode 600 Ω impedance is output.
(9) Common mode 100 omega
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value P channel is that resistors R5, R7 and R9 are connected in parallel and then connected in series with a resistor R2. The N channel is formed by connecting resistors R6, R8 and R10 in parallel and then connecting the resistors R3 in series, and the two channels are respectively 50 omega and have the same phase. At this time, a common mode 100 Ω impedance is output.
(10) Common mode 40 omega
In the double-channel relays K1-K7, the closing directions of the switches in the P channel and the N channel are as follows: the impedance value P channel is a resistor R2, the impedance value N channel is a resistor R3, the two channels are 20 omega respectively, and the phases are the same. At this time, a common mode 40 Ω impedance is output.
The system impedance is flexibly switched, the repeated utilization of the matching resistor is realized, and the complexity of the matching circuit is reduced.
Example two
In one or more embodiments, a method of implementing multiple types of audio output impedances is disclosed, comprising:
connecting a plurality of double-channel relays in series;
a plurality of resistors with set resistance values are connected between two adjacent double-channel relays;
the connection between the two-channel relays and the series connection or parallel connection of the set resistors are realized by controlling the on-off of the switches of the P channel and the N channel in the two-channel relays, and finally the required impedance value is output.
The on-off of the switches of the P channel and the N channel in the dual-channel relay is controlled, and the impedance values output by the P channel and the N channel after the dual-channel relay is connected in series are equal by setting the series connection or the parallel connection of resistors; the output of balanced impedance values or common mode impedance is realized.
The on-off of a switch of one channel in the dual-channel relay is controlled, and after the dual-channel relay is connected in series, the corresponding channel outputs a set impedance value and the output of the other channel is grounded through the series connection or the parallel connection of the set resistors, so that the output of unbalanced impedance is realized.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A system for implementing multiple types of audio output impedances, comprising: the relay comprises a plurality of double-channel relays connected in series, wherein a P channel and an N channel of each double-channel relay respectively comprise two switches with a common end; a plurality of resistors with set resistance values are connected between two adjacent double-channel relays; the connection between the two-channel relays and the series connection or parallel connection of the set resistors are realized by controlling the on-off of the switches of the P channel and the N channel in the two-channel relays, and finally the required impedance value is output.
2. The system for realizing the multi-type audio output impedance according to claim 1, wherein the output end of the impedance value is sequentially connected with two-channel relays in series, wherein the P channel and the N channel of one two-channel relay are respectively connected with the unbalanced interface, and the output of one of the P channel and the N channel is grounded; and the P channel and the N channel of the other double-channel relay are respectively connected with the balance interface.
3. The system for realizing the multi-type audio output impedance is characterized in that the on-off of the switches of the P channel and the N channel in the dual-channel relay is controlled, and the impedance values of the P channel and the N channel output after the dual-channel relay is connected in series are equal by setting the series connection or the parallel connection of the resistors; the output of balanced impedance values or common mode impedance is realized.
4. The system for realizing multiple types of audio output impedances according to claim 1, wherein the on/off switching of one channel of the two-channel relays is controlled by setting the serial connection or parallel connection of resistors, so that after the two-channel relays are connected in series, the corresponding channel outputs the set impedance value, and the output of the other channel is grounded, thereby realizing the output of unbalanced impedance.
5. A method of implementing multiple types of audio output impedances, comprising:
connecting a plurality of double-channel relays in series;
a plurality of resistors with set resistance values are connected between two adjacent double-channel relays;
the on-off of the switches of the P channel and the N channel in the dual-channel relay is controlled simultaneously, so that the connection between the dual-channel relays and the series connection or parallel connection of the set resistors are realized, and finally, the required impedance value is output.
6. The method for realizing the multi-type audio output impedance is characterized in that the on-off of the switches of the P channel and the N channel in the dual-channel relay are controlled simultaneously, and the impedance values output by the P channel and the N channel after the dual-channel relay is connected in series are equal by setting the series connection or the parallel connection of the resistors; the output of balanced impedance values or common mode impedance is realized.
7. The method as claimed in claim 5, wherein the switching of one of the two channels of the two-channel relay is controlled to be turned on or off, and the two-channel relay outputs the set impedance value after the two-channel relay is connected in series, and the output of the other channel is grounded, so that the output of the unbalanced impedance is realized.
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