CN210168211U - Impedance balanced type stereo transmission assembly utilizing differential amplification - Google Patents
Impedance balanced type stereo transmission assembly utilizing differential amplification Download PDFInfo
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- CN210168211U CN210168211U CN201921278954.3U CN201921278954U CN210168211U CN 210168211 U CN210168211 U CN 210168211U CN 201921278954 U CN201921278954 U CN 201921278954U CN 210168211 U CN210168211 U CN 210168211U
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Abstract
The utility model relates to an utilize differential amplified impedance balance type stereo transmission assembly, including receiving the stereo signal source end of unbalance, balanced type left track cable and right track cable, the signal source end includes left track hot junction, right track hot junction and earthing terminal, left track cable and right track cable are the paired line, one in the paired line of left track cable links to each other through resistance and the earthing terminal of signal source end, another direct left track hot junction with signal source end links to each other; one of the twisted-pair wires of the right sound channel cable is connected with the grounding end of the signal source end through a resistor, and the other twisted-pair wire of the right sound channel cable is directly connected with the right sound channel hot end of the signal source end; and the twisted-pair lines of the left sound channel cable and the right sound channel cable are connected with a receiving end through a differential amplifier. The utility model discloses can reduce the encapsulation volume to can improve transmission effect.
Description
Technical Field
The utility model relates to an audio signal transmission technical field especially relates to an utilize impedance balance type stereo transmission subassembly of differential enlargies.
Background
In the electronic transmission technology, balanced transmission is favored because of being capable of resisting interference, and unbalanced transmission only has two terminals, namely a signal terminal and a grounding terminal, and is used in occasions with low requirements and short-distance signal transmission. Unbalanced signals are to be transmitted as balanced, typically using three point connections, i.e. a left channel hot side, a right channel hot side and a common ground. In such a method, a transformer is usually added to convert a balanced signal into an unbalanced signal for transmission, so that the overall size of the transformer is increased during packaging, and the transformer has phase difference variation and frequency response problems, which affect the transmission effect. Therefore, a transmission method without transformer is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an impedance balanced type stereo transmission assembly that utilizes differential amplification is provided, can reduce the volume of encapsulation.
The utility model provides a technical scheme that its technical problem adopted is: the impedance balanced type stereo transmission assembly comprises a signal source end for receiving unbalanced stereo, a balanced type left channel cable and a balanced type right channel cable, wherein the signal source end comprises a left channel hot end, a right channel hot end and a grounding end; one of the twisted-pair wires of the right sound channel cable is connected with the grounding end of the signal source end through a resistor, and the other twisted-pair wire of the right sound channel cable is directly connected with the right sound channel hot end of the signal source end; and the twisted-pair lines of the left sound channel cable and the right sound channel cable are connected with a receiving end through a differential amplifier.
The resistors are used for enabling the impedance characteristics of the cold ends of the left channel cable and the right channel cable to be equal to the resistors of the left channel hot end and the right channel hot end of the signal source end.
The left sound channel cable and the right sound channel cable both comprise shielding wires, and the shielding wires are connected with the grounding end of the signal source end.
The signal source end is a TRS connector.
The receiving end is a TRS connector, an XLR plug or a phoenix connector.
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 a line in the twisted pair of well left sound channel passes through the earthing terminal that resistance meets signal source terminal, the left sound channel hot junction of another line and signal source terminal, a line in the twisted pair of right sound channel passes through the earthing terminal that resistance meets signal source terminal, the right sound channel hot junction of another line and signal source terminal, realize the impedance balance of sending end and cable through increasing impedance, the interference is eliminated through the differential enlarged mode to the receiving terminal of twisted pair simultaneously, do not need the transformer in the whole subassembly, thereby the volume of whole subassembly has been reduced.
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 utility model discloses an embodiment relates to an utilize unbalanced stereo transmission assembly of differential amplification, as shown in fig. 1, including receiving unbalanced stereo's signal source end 1, left track cable 2 and right track cable 3, signal source end 1 includes left track hot junction 11, right track hot junction 12 and earthing terminal 13, left track cable 2 and right track cable 3 are the twisted-pair line, a wire 21 in the twisted-pair line of left track cable 2 links to each other with earthing terminal 13 of signal source end 1 through resistance R1, another wire 22 directly links to each other with left track hot junction 11 of signal source end 1; one wire 31 in the twisted pair of the right channel cable 3 is connected with the grounding end 13 of the signal source end 1 through a resistor R2, and the other wire 32 is directly connected with the right channel hot end 12 of the signal source end 1; and the twisted pairs of the left sound channel cable 2 and the right sound channel cable 3 are connected with a receiving end through a differential amplifier.
In this embodiment, the signal source terminal 1 may adopt a 6.35mm TRS connector, or may adopt a 3.5mm TRS connector. The receiving end can adopt a 6.35mm TRS connector, an XLR 3P plug or a PHONIEX phoenix connector.
In this embodiment, the resistor R1 and the resistor R2 are respectively used to make the impedance characteristics of the cold ends of the left channel cable 2 and the right channel cable 3 equal to the resistors of the hot end of the left channel and the hot end of the right channel at the signal source end, that is, the resistance value configuration of the resistor needs to meet the characteristic impedance of the sending end (such as a mobile phone or MP3) in the market, that is, the impedance characteristics of the left channel cable and the right channel cable are made equal to the internal resistance of the mobile phone or MP3 by the resistor, at this time, the cold end and the hot end receive the interference signal simultaneously when the transmission line is dispersed in space, so that the transmission line can obtain the maximum power, if the impedance of the receiving end is matched, only the voltage wave and the current wave traveling to the terminal are on the transmission line, and. Therefore, the embodiment utilizes an impedance matching mode and realizes unbalanced stereo impedance balanced transmission by matching two balanced twisted pairs.
In this embodiment, the twisted pairs of the left channel cable 2 and the right channel cable 3 are both connected to the receiving end through a differential amplifier, and interference signals in the transmission process of the twisted pairs can be eliminated through differential amplification. Because the interference is received by the even transposition of the twisted pair, the common mode interference signal can be removed when the twisted pair of the left channel cable 2 and the right channel cable 3 are both connected with the receiving end differential amplifier, so that the original interference-free signal can be kept, and the specific description is as follows:
in an ideal state, a device at the source end of the signal emits a sinL signal and a sinR signal, one wire 22 in the twisted pair of the left channel transmits the sinL signal, the other wire 21 is grounded and equals to no signal 0, and the receiving end obtains sinL-0 ═ sinL through differential amplification. One wire 32 of the right channel twisted pair transmits sinR signal, the other wire 31 is grounded and is equivalent to no signal 0, and the receiving end obtains sinR-0 as sinR through differential amplification. Because the twisted pairs of the left channel and the right channel run on the same path and are twisted in pairs, after the interference actually occurs, the twisted pairs obtain certain common mode interference and are written as N. The device at the signal source end still sends a sinL signal and a sinR signal, one wire 22 in the twisted pair of the left channel transmits a sinL signal + N interference signal, the other wire 21 is grounded and equivalently has no signal, and transmits a 0+ N interference signal, and the receiving end obtains sinL + N- (0+ N) ═ sinL after differential amplification. One wire 32 of the right channel twisted pair transmits sinR signal + N interference signal, the other wire 31 is grounded and equivalent to no signal, and transmits 0+ N interference signal, and the receiving end can obtain sinR + N- (0+ N) ═ sinR after differential amplification. Therefore, the N interference signals can be effectively eliminated after differential amplification.
In this embodiment, the left channel cable 2 further includes a shielding wire 23, the right channel cable 3 further includes a shielding wire 33, the shielding wire 23 and the shielding wire 33 are both connected to the ground terminal of the signal source end, and partial interference can be shielded by setting the grounding of the shielding wire, so that the shielding structure is eliminated, and the cost can be reduced.
It is not difficult to discover, the utility model discloses a line in the twisted pair of well left sound channel passes through the earthing terminal that resistance meets signal source terminal, the left sound channel hot junction of another line and signal source terminal, the earthing terminal that a line in the twisted pair of right sound channel passes through resistance and meets signal source terminal, the right sound channel hot junction of another line and signal source terminal, realize the impedance balance of sending end and cable through increasing the impedance, the interference is eliminated through differential amplified mode to the receiving terminal of twisted pair simultaneously, do not need the transformer in the whole subassembly, thereby the volume of whole subassembly has been reduced.
Claims (5)
1. An impedance balanced type stereo transmission assembly utilizing differential amplification comprises a signal source end for receiving unbalanced stereo, a balanced type left channel cable and a balanced type right channel cable, wherein the signal source end comprises a left channel hot end, a right channel hot end and a grounding end; one of the twisted-pair wires of the right sound channel cable is connected with the grounding end of the signal source end through a resistor, and the other twisted-pair wire of the right sound channel cable is directly connected with the right sound channel hot end of the signal source end; and the twisted-pair lines of the left sound channel cable and the right sound channel cable are connected with a receiving end through a differential amplifier.
2. The impedance-balanced stereo transmission assembly using differential amplification according to claim 1, wherein the resistors are configured to equalize the impedance characteristics of the cold ends of the left channel cable and the right channel cable with the resistances of the left channel hot end and the right channel hot end of the signal source end.
3. The impedance-balanced stereo transmission assembly using differential amplification according to claim 1, wherein the left channel cable and the right channel cable each include a shielding wire, and the shielding wire is connected to a ground terminal of the signal source terminal.
4. The impedance balanced stereo transmission assembly using differential amplification of claim 1, wherein the signal source terminal is a TRS connector.
5. The impedance balanced stereo transmission assembly with differential amplification of claim 1, wherein the receiving end is a TRS connector, an XLR plug, or a phoenix connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921278954.3U CN210168211U (en) | 2019-08-08 | 2019-08-08 | Impedance balanced type stereo transmission assembly utilizing differential amplification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921278954.3U CN210168211U (en) | 2019-08-08 | 2019-08-08 | Impedance balanced type stereo transmission assembly utilizing differential amplification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210168211U true CN210168211U (en) | 2020-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921278954.3U Active CN210168211U (en) | 2019-08-08 | 2019-08-08 | Impedance balanced type stereo transmission assembly utilizing differential amplification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210168211U (en) |
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2019
- 2019-08-08 CN CN201921278954.3U patent/CN210168211U/en active Active
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