CN210469232U - Utilize differential amplification to use unbalanced transmission subassembly for electroacoustic equipment - Google Patents
Utilize differential amplification to use unbalanced transmission subassembly for electroacoustic equipment Download PDFInfo
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- CN210469232U CN210469232U CN201921278952.4U CN201921278952U CN210469232U CN 210469232 U CN210469232 U CN 210469232U CN 201921278952 U CN201921278952 U CN 201921278952U CN 210469232 U CN210469232 U CN 210469232U
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- signal source
- twisted pair
- differential amplification
- unbalanced transmission
- cable
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Abstract
The utility model relates to an utilize differential amplified for electroacoustic equipment unbalanced transmission subassembly, including signal source end and cable, the signal source end includes hot junction and earthing terminal, the cable is the paired line, a wire in the paired line links to each other with the hot junction of signal source end, and another wire passes through resistance and links to each other with the earthing terminal of signal source end; the twisted pair is connected with a receiving end through a differential amplifier. The utility model discloses can eliminate the interference.
Description
Technical Field
The utility model relates to an audio signal transmission technical field especially relates to an utilize differential amplified's unbalanced transmission subassembly for electroacoustic equipment.
Background
The existing electroacoustic equipment and musical instrument usually adopt unbalanced transmission because only the short-distance use is considered, but the unbalanced transmission is easy to encounter the interference on the path, so that the subsequent circuits all carry noise signals. If a balanced transmission is used, a large transformer is generally required to be configured as a matching, so that there is a characteristic that it is inconvenient for mobile use.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an utilize differential amplification's unbalanced transmission subassembly for electroacoustic equipment is provided, interference can be eliminated.
The utility model provides a technical scheme that its technical problem adopted is: the unbalanced transmission component for the electroacoustic equipment utilizing differential amplification comprises a signal source end and a cable, wherein the signal source end comprises a hot end and a grounding end, the cable is a twisted pair, one wire of the twisted pair is connected with the hot end of the signal source end, and the other wire of the twisted pair is connected with the grounding end of the signal source end through a resistor; the twisted pair is connected with a receiving end through a differential amplifier.
The resistor is used for enabling the impedance characteristic of the cable to be equal to the internal resistance of the electro-acoustic equipment at the signal source end.
The resistor is a variable resistor.
The cable further comprises a shielding wire, and the shielding wire is connected with a grounding end of the signal source end.
When the receiving end is a balanced connector, the twisted pair is directly connected with a receiving end plug through a differential amplifier.
And when the receiving end is an unbalanced connector, the twisted pair passes through the differential amplifier and then is connected with a receiving end plug through the voltage transformation converter.
The high impedance end of the transformation converter is connected with the output of the differential amplifier, and the low impedance end of the transformation converter is connected with the receiving end plug.
Advantageous effects
Since the technical scheme is used, compared with the prior art, the utility model, have following advantage and positive effect: the utility model discloses to the unbalanced signal add a resistance to ground, this resistance is connected to the cold-end line in the twisted-pair line, realizes the impedance match of input through the regulation of this resistance to make the transmission line can obtain maximum power. In addition, the twisted pair eliminates interference signals generated by signals on path transmission by means of differential amplification. The utility model provides a twisted-pair line passes through the transformer converter and links to each other with the receiving terminal to make the equipment of receiving terminal can send better signal.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
The embodiment of the utility model relates to an utilize differential amplification's unbalanced transmission subassembly for electroacoustic equipment, as shown in fig. 1, including signal source end 1 and cable 2, signal source end 1 includes hot junction 11 and earthing terminal 12, cable 2 is the twisted pair, a wire 21 in the twisted pair links to each other with the hot junction 11 of signal source end 1, and another wire 22 links to each other with earthing terminal 12 of signal source end 1 through resistance R; the twisted pair is connected to the receiving terminal 3 via a differential amplifier (not shown).
The resistor R in this embodiment is used to make the impedance characteristic of the cable 2 equal to the internal resistance of the instrument at the signal source end, that is, the resistance value configuration of the resistor R needs to meet the characteristic impedance of the instrument on the market, that is, the impedance characteristic of the cable is made equal to the internal resistance of the instrument through the resistor R. In order to facilitate adjustment, the resistor in this embodiment may use a variable resistor, and the resistance value of the variable resistor is adjusted to adapt to the internal resistances of different musical instruments. When the above requirements are met, the wires 21 and 22 will obtain the same amount of common mode interference on the path, and the common mode interference can be cancelled by connecting with a receiving end differential amplifier (not shown in the figure), so that only the hot end signal of the wire 21 is left, and thus, the impedance balanced transmission of unbalanced signals is realized.
In this embodiment, the twisted pair of the cable is connected to the receiving end through the differential amplifier, and the principle that the interference signal in the transmission process of the twisted pair can be eliminated through the differential amplification is specifically as follows:
in an ideal state, a device at the source end emits sinA signals, one wire 21 in the twisted pair of the cable 2 transmits sinA signals, the other wire 22 is grounded and equals to no signal 0, and the receiving end obtains sinA-0 as sinA through differential amplification. Since the twisted pair travels and twists on the same path, the twisted pair gets a certain common mode interference written as N after actually encountering the interference. The device at the signal source still emits sinA signal, one wire 21 in the twisted pair of the cable 2 transmits sinA signal + N interference signal, the other wire 22 is grounded and equivalent to no signal, and transmits 0+ N interference signal, and the receiving end can obtain sinA + N- (0+ N) ═ sinA after differential amplification. Therefore, the N interference signals can be effectively eliminated after differential amplification.
In this embodiment, the cable 2 further includes a shielding wire 23, the shielding wire 23 is connected to the ground terminal of the signal source terminal, and partial interference can be eliminated by setting the shielding wire to be grounded, so that the shielding structure is eliminated, and the cost can be reduced.
When the receiving terminal 3 is a balanced connector, the twisted pair is directly connected to the plug of the receiving terminal 3 through a differential amplifier. In fig. 1, the receiving terminal 3 is an unbalanced connector, so that the twisted pair passes through the differential amplifier and then is connected to the plug of the receiving terminal 3 through the transformer converter 4. Wherein, the high impedance end of the transformer converter 4 is connected with the output of the differential amplifier, so that the signal can be fully obtained. The low impedance end of the voltage transformation converter 4 is connected with the plug of the receiving end 3, so that a good signal can be fully sent to the sound box end of the musical instrument. As can be seen from this, in the present embodiment, the attenuation of the signal by the cable is reduced by the voltage-dividing law using the transformer converter.
It can be seen that the present invention adds a resistance to ground to the unbalanced signal, which is connected to the cold end line (i.e., the conductor 22) in the twisted pair, and the impedance matching of the input end is achieved by adjusting the resistance, so that the transmission line can obtain the maximum power. In addition, the twisted pair eliminates interference signals generated by signals on path transmission by means of differential amplification.
Claims (7)
1. An unbalanced transmission component for electroacoustic equipment using differential amplification comprises a signal source end and a cable, wherein the signal source end comprises a hot end and a grounding end, and is characterized in that the cable is a twisted pair, one wire of the twisted pair is connected with the hot end of the signal source end, and the other wire of the twisted pair is connected with the grounding end of the signal source end through a resistor; the twisted pair is connected with a receiving end through a differential amplifier.
2. The unbalanced transmission assembly for an electroacoustic device using differential amplification as claimed in claim 1, wherein the resistor is configured to equalize an impedance characteristic of the cable to an internal resistance of the electroacoustic device at the signal source side.
3. The unbalanced transmission module for an electroacoustic device using differential amplification as claimed in claim 1, wherein the resistor is a variable resistor or a fixed resistor.
4. The unbalanced transmission module for an electroacoustic device using differential amplification as claimed in claim 1, wherein the cable further comprises a shield wire connected to a ground terminal of a signal source terminal.
5. The unbalanced transmission module for an electroacoustic device using differential amplification as claimed in claim 1, wherein when the receiving terminal is a balanced connector, the twisted pair is directly connected to a receiving terminal plug through a differential amplifier.
6. The unbalanced transmission module for an electroacoustic device using differential amplification as claimed in claim 1, wherein when the receiving terminal is an unbalanced connector, the twisted pair is connected to a receiving terminal plug through a transformer converter after passing through a differential amplifier.
7. The unbalanced transmission module for an electroacoustic device using differential amplification as claimed in claim 6, wherein the high impedance terminal of the transformer is connected to the output of the differential amplifier, and the low impedance terminal of the transformer is connected to a receiving terminal plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921278952.4U CN210469232U (en) | 2019-08-08 | 2019-08-08 | Utilize differential amplification to use unbalanced transmission subassembly for electroacoustic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921278952.4U CN210469232U (en) | 2019-08-08 | 2019-08-08 | Utilize differential amplification to use unbalanced transmission subassembly for electroacoustic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210469232U true CN210469232U (en) | 2020-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921278952.4U Active CN210469232U (en) | 2019-08-08 | 2019-08-08 | Utilize differential amplification to use unbalanced transmission subassembly for electroacoustic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210469232U (en) |
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2019
- 2019-08-08 CN CN201921278952.4U patent/CN210469232U/en active Active
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