CN202111843U - Sound for suppressing TDMA noises - Google Patents
Sound for suppressing TDMA noises Download PDFInfo
- Publication number
- CN202111843U CN202111843U CN2011201891113U CN201120189111U CN202111843U CN 202111843 U CN202111843 U CN 202111843U CN 2011201891113 U CN2011201891113 U CN 2011201891113U CN 201120189111 U CN201120189111 U CN 201120189111U CN 202111843 U CN202111843 U CN 202111843U
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- resonant circuit
- sound
- isolation amplifier
- ground
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Abstract
The utility model discloses a sound for suppressing TDMA (Time Division Multiple Address) noises. The sound comprises an RC (Resonance Circuit) and a ground noise isolation amplifier, wherein the RC comprises a first RC and a second RC; left channel signals and right channel signals inputted to the sound are respectively connected with a fourteenth pin and an eighth pin of the ground noise isolation amplifier via the first RC; negative signals inputted to the sound are respectively connected with a twelfth pin and a tenth pin of the ground noise isolation amplifier via the first RC; and a first pin and a seventh pin, respectively as the first output end and a second output end of the ground noise isolation amplifier, are respectively connected with the left and the right channels of the sound via the second RC. By adopting the sound provided by the utility model, owing to the RC and the ground noise isolation amplifier respectively arranged at the input end and the output end, the TDMA noises coupled in a voice frequency circuit can be effectively suppressed, and beautiful music can be played in a noiseless manner without being affected by incoming calls.
Description
Technical field
The utility model relates to a kind of sound equipment, relates in particular to a kind of sound equipment of the TDMA of inhibition noise.
Background technology
Common player receives " grunt " of sending when making a phone call sometimes; We are referred to as the TDMA noise; It comes from the 217Hz frequency waveform that produces in the GSM cell phone, when it is coupled to audio path and passes to loud speaker, receiver or microphone, can produce the noise that can hear.
The utility model content
The purpose of the utility model is to provide a kind of sound equipment of the TDMA of inhibition noise.
Be to realize that above-mentioned purpose, the characteristics of the sound equipment of the said TDMA of inhibition noise are, comprise RC resonant circuit and ground noise isolation amplifier U3, said RC resonant circuit comprises a RC resonant circuit and the 2nd RC resonant circuit; Wherein, The left channel signals that inputs to sound equipment and right-channel signals are connected the 14th pin and the 8th pin of ground noise isolation amplifier U3 respectively through a said RC resonant circuit, the negative signal that inputs to sound equipment connects the 12nd pin and the 10th pin of ground noise isolation amplifier U3 respectively through a said RC resonant circuit; The R channel and the L channel that are connected sound equipment as the 1st pin of first output of ground noise isolation amplifier U3 and second output and the 7th pin respectively through said the 2nd a RC resonant circuit.
Preferably, a said RC resonant circuit comprises a capacitor C 1 and a resistance R 1, and wherein capacitor C 1 is 33PF, and resistance R 1 is 1K Ω; Said the 2nd RC resonant circuit comprises a capacitor C 2 and a resistance R 2, and wherein capacitor C 2 is 33PF, and resistance R 2 is 33K Ω.
Preferably, the ground lead of the sound equipment of the said TDMA of inhibition noise is bifilar shielding conductor.
Preferably, on the circuit board of the sound equipment of the said TDMA of inhibition noise the large tracts of land ground plane is set.
The beneficial effect of the utility model is; Use the said sound equipment that suppresses the TDMA noise; Be arranged at the RC resonant circuit and the ground noise isolation amplifier of input/output signal end through it; Can suppress to be coupled in the TDMA noise of the 217Hz of voicefrequency circuit effectively, thereby the influence that said sound equipment is not sent a telegram here plays out to noiseless melodious music.
Description of drawings
Fig. 1 shows the circuit diagram that the said sound equipment of the utility model suppresses the TDMA noise.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done further detailed explanation:
Fig. 1 shows the circuit diagram that the said sound equipment of the utility model suppresses the TDMA noise, and is as shown in Figure 1, and the sound equipment of the said TDMA of inhibition noise comprises RC resonant circuit and ground noise isolation amplifier.The chip model of said ground noise isolation amplifier U3 is NJM2794; Said RC resonant circuit comprises a RC resonant circuit, the 2nd RC resonant circuit and the 3rd RC resonant circuit; The input signal that inputs to said sound equipment comprises right-channel signals, left channel signals and negative signal.A said RC resonant circuit comprises a capacitor C 1 and a resistance R 1, and wherein capacitor C 1 is 33PF, and resistance R 1 is 1K Ω; Said the 2nd RC resonant circuit comprises a capacitor C 2 and a resistance R 2, and wherein capacitor C 2 is 33PF, and resistance R 2 is 33K Ω; Said the 3rd RC resonant circuit comprises a capacitor C 3 and a resistance R 3, and wherein capacitor C 3 is 10PF, and resistance R 3 is 10K Ω.
Particularly; Through the right-channel signals of the 2nd pin of connector XZ3 input in order the capacitor C 27 of ground warp one a RC resonant circuit and 1uF be connected the 14th pin of said ground noise isolation amplifier U3; Through the negative signal of the 3rd pin of connector XZ3 input in order the capacitor C 26 of ground warp one a RC resonant circuit and 1uF be connected the 12nd pin and the 10th pin of said ground noise isolation amplifier U3 respectively, the left channel signals of importing through the 4th pin of the connector XZ3 capacitor C 25 of ground warp one a RC resonant circuit and 1uF in order is connected the 8th pin of said ground noise isolation amplifier U3.And, between the 2nd, 3 pins of connector XZ3 and between the 3rd, 4 pins respectively the shunt capacitance value be capacitor C 58 and the capacitor C 59 of 22PF; The capacitor C 60 that a parallelly connected capacitance is 33PF between the node after the 2nd, 3 pins of connector XZ3 connect one the one RC resonant circuit respectively, the capacitor C 66 that a parallelly connected capacitance is 33PF between the node after the 3rd, 4 pins of connector XZ3 connect one the one RC resonant circuit respectively.
As the 1st pin of first output of said ground noise isolation amplifier U3 in order the capacitor C 54 of ground warp 4uF be connected the R channel of sound equipment with one the 2nd RC resonant circuit, as the 7th pin of second output of said ground noise isolation amplifier U3 in order the capacitor C 49 of ground warp 4uF be connected the L channel of sound equipment with one the 2nd RC resonant circuit.
The 3rd pin ground connection as the earth terminal of said ground noise isolation amplifier U3; As the 4th pin of the reference voltage end of said ground noise isolation amplifier U3 capacitor C 51 ground connection, connect the 9V high voltage through one the 3rd RC resonant circuit as the 5th pin of the high voltage end of said ground noise isolation amplifier U3 through 10uF; In addition; The capacitor C 55 of parallelly connected 33PF between the 1st, 3 pins of ground noise isolation amplifier U3; Parallel connection is one another in series between the 5th, 7 pins of ground noise isolation amplifier U3 capacitor C 62 and capacitor C 61, wherein the capacitance of capacitor C 62, C61 is respectively 10uF and 22PF; And the 5th pin of ground noise isolation amplifier U3 is through capacitor C 72 ground connection of 22PF.
Further, the lead-in wire of ground connection all adopts bifilar shielding conductor in the circuit shown in Figure 1, so that the TDMA noise signal that is coupled in the voicefrequency circuit is decreased to least energy.
Further, the pcb board that carries said acoustics circuit adopts the large tracts of land ground plane, makes potential TDMA noise signal be coupled to the earth rapidly.
The operation principle that said sound equipment suppresses the TDMA noise is in said ground of the application noise isolation amplifier, because two difference channels have very strong inhibition ability to common mode input signal, therefore can eliminate the common mode disturbances that is coupling in left channel signals and right-channel signals.In addition; The signal input part of noise isolation amplifier is connected a RC resonant circuit and the 2nd RC resonant circuit respectively with output on said ground; And on ground the high voltage end of noise isolation amplifier connects the 3rd RC resonant circuit; Because capacitor C 1, the C2 of the 33PF in the first and second RC resonant circuits; And the 3rd capacitor C 3 of 10PF in the RC resonant circuit, but bypass be coupled in the input signal with power supply signal in the TDMA noise signal, promptly come from the 217HZ frequency signal that produces in the GSM cell phone.
Being merely the utility model preferred embodiment in sum, is not the practical range that is used for limiting the utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should belong to the technological category of the utility model.
Claims (4)
1. sound equipment that can suppress the TDMA noise is characterized in that: comprise RC resonant circuit and ground noise isolation amplifier (U3), said RC resonant circuit comprises a RC resonant circuit and the 2nd RC resonant circuit; Wherein,
The left channel signals that inputs to sound equipment and right-channel signals are connected the 14th pin and the 8th pin of ground noise isolation amplifier (U3) respectively through a said RC resonant circuit, the negative signal that inputs to sound equipment connects the 12nd pin and the 10th pin of ground noise isolation amplifier (U3) respectively through a said RC resonant circuit; The R channel and the L channel that are connected sound equipment as the 1st pin of first output of ground noise isolation amplifier (U3) and second output and the 7th pin respectively through said the 2nd a RC resonant circuit.
2. according to the said sound equipment that suppresses the TDMA noise of claim 1, it is characterized in that: a said RC resonant circuit comprises electric capacity (C1) and a resistance (R1), and wherein electric capacity (C1) is 33PF, and resistance (R1) is 1K Ω; Said the 2nd RC resonant circuit comprises electric capacity (C2) and a resistance (R2), and wherein electric capacity (C2) is 33PF, and resistance (R2) is 33K Ω.
3. according to claim 1 or the 2 said sound equipments that suppress the TDMA noise, it is characterized in that: its ground lead is bifilar shielding conductor.
4. according to claim 1 or the 2 said sound equipments that suppress the TDMA noise, it is characterized in that: the large tracts of land ground plane is set on its circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201891113U CN202111843U (en) | 2011-06-07 | 2011-06-07 | Sound for suppressing TDMA noises |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201891113U CN202111843U (en) | 2011-06-07 | 2011-06-07 | Sound for suppressing TDMA noises |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202111843U true CN202111843U (en) | 2012-01-11 |
Family
ID=45437293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201891113U Expired - Fee Related CN202111843U (en) | 2011-06-07 | 2011-06-07 | Sound for suppressing TDMA noises |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202111843U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970396A (en) * | 2012-05-16 | 2013-03-13 | 深圳凯虹移动通信有限公司 | Audio processing circuit and communication terminal |
| CN106454641A (en) * | 2016-09-21 | 2017-02-22 | 四川长虹电器股份有限公司 | Circuit capable of inhibiting sound accompaniment noise |
-
2011
- 2011-06-07 CN CN2011201891113U patent/CN202111843U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970396A (en) * | 2012-05-16 | 2013-03-13 | 深圳凯虹移动通信有限公司 | Audio processing circuit and communication terminal |
| CN102970396B (en) * | 2012-05-16 | 2016-01-27 | 深圳凯虹移动通信有限公司 | A kind of audio frequency processing circuit and communicating terminal |
| CN106454641A (en) * | 2016-09-21 | 2017-02-22 | 四川长虹电器股份有限公司 | Circuit capable of inhibiting sound accompaniment noise |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20150607 |
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| EXPY | Termination of patent right or utility model |