CN202818236U - High tone-quality audio output circuit - Google Patents
High tone-quality audio output circuit Download PDFInfo
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- CN202818236U CN202818236U CN 201120572279 CN201120572279U CN202818236U CN 202818236 U CN202818236 U CN 202818236U CN 201120572279 CN201120572279 CN 201120572279 CN 201120572279 U CN201120572279 U CN 201120572279U CN 202818236 U CN202818236 U CN 202818236U
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Abstract
The utility model provides a high tone-quality audio output circuit which comprises a pre-stage operation amplifier U1 and a backward stage operation amplifier U2 which connected between an audio differential voltage input and an audio left-and-right channel output, wherein a pin (1) of the pre-stage operation amplifier U1 is connected with a pin (2) of the backward stage operation amplifier U2 through a capacitor CD3, a resistor R16, and a resistor R18; and a pin (2) of the pre-stage operation amplifier U1 is a negative electrode, and is connected with an Audio_R_N pin of the audio differential voltage input through a resistor R14 and a resistor R11 and through a capacitor C12, a resistor R15 and a resistor R11 which are in series connection. The rest can be done in the same manner. According to the audio output circuit which uses double operation amplifiers, the pre-stage operation amplifier is mainly used to realize conversion of audio differential voltage signals into analogue audio signals and to realize sound volume amplification and second order MFB low-pass filtering, the backstage operation amplifier is a low pass filter and is used to improve tone quality, and the resistors and capacitors in the circuit are common members, which is conductive to parameter setting.
Description
Technical field
The utility model relates to a kind of audio output circuit of high tone quality.
Background technology
The audio frequency output of high tone quality is very crucial beyond doubt for hand-held series products or audio frequency and video class set-top box, especially in the employed set-top box in KTV field, these equipment are very high to the requirement of audio frequency tonequality, and audio frequency output therefore how to design high tone quality is a very crucial technology for KTV class set-top box.
In order to improve the tonequality of audio frequency, common way has following several at present:
1, uses the higher amplifier of overall performance index;
2, use negative and positive dual power to power to amplifier;
3, the devices such as peripheral resistance, electric capacity use special audio class device, especially electric capacity;
4, use the audio output circuit of double operational, and the parameter of design control amplifier low pass filter.
The main following points of the shortcoming of above-mentioned current audio circuit design:
Shortcoming 1: use simply expensive audio frequency dedicated devices or the higher amplifier of overall performance index, although can improve the tonequality of audio frequency, meeting is so that the holistic cost rising of product;
Shortcoming 2: using negative and positive dual power to power to amplifier, need to increase No. one negative supply circuit, increase the cost of system, and only use negative and positive dual power to power to amplifier, is very limited to the tonequality that improves audio frequency;
Shortcoming 3: use the audio output circuit of double operational, its circuit structure does not often obtain substantial raising because the parameter of filter arranges the unreasonable tonequality of audio frequency and the tone sense of causing.
The utility model content
The technical problems to be solved in the utility model, be to provide a kind of audio output circuit of high tone quality, use the audio output circuit prime amplifier of double operational to realize that mainly the audio frequency differential voltage signal is converted into simulated audio signal, and the realization volume is amplified and second order MFB low-pass filtering, the rear class amplifier is low pass filter, be used for improving tonequality, capacitance-resistance is all used prevailing device, and is beneficial to rational parameters.
The utility model is achieved in that a kind of audio output circuit of high tone quality, comprise the prime amplifier U1 and the rear class amplifier U2 that are connected between the input of audio frequency differential voltage and the output of audio frequency left and right acoustic channels, wherein, the pin 1 of described prime amplifier U1 passes through the pin 2 that a capacitor C D3 is connected with resistance R, R18 connects rear class amplifier U2; The pin 2 of described prime amplifier U2 is negative pole, and capacitor C 12, resistance R 15, the R11 by R14, R11 and series connection is connected to the Audio_R_N pin of described audio frequency differential voltage input, and described capacitor C 12 also connects the pin 1 of prime amplifier U1; The pin 3 of described prime amplifier U3 is anodal, by capacitor C 10 ground connection, also connect the first meta power supply by resistance R 13, R12, resistance R 12 is also by capacitor C 9 ground connection, resistance R 13 also is connected to the Audio_R_P pin of described audio frequency differential voltage input by resistance R 10, also be connected with capacitor C 11 between resistance R 13 and the R14; Pin 4 ground connection of described prime amplifier U1; The pin 5 of described prime amplifier U1 is anodal, by capacitor C 3 ground connection, also connects the second meta power supply by resistance R 4, R3, and resistance R 3 is also by capacitor C 1 ground connection, and resistance R 4 also is connected to the Audio_L_P pin of described audio frequency differential voltage input by resistance R 1; The pin 6 of described prime amplifier U1 is negative pole, be connected to the Audio_L_N pin of described audio frequency differential voltage input by capacitor C 4, resistance R 6, the R2 of R5, R2 and series connection, described capacitor C 4 also connects the pin 7 of prime amplifier U1, also is connected with capacitor C 11 between resistance R 4 and the R5; The pin 7 of described prime amplifier U1 passes through the pin 6 that a capacitor C D1 is connected with resistance R, R9 connects rear class amplifier U2; The pin 8 of described prime amplifier U1 connects power supply, and respectively by capacitor C 5, C13 ground connection;
The pin 1 of described rear class amplifier U2 connects the Audio_R pin of described audio frequency left and right acoustic channels output by capacitor C D4; The pin 2 of described rear class amplifier U2 is negative pole, and by the pin 1 of capacitor C 15 connection rear class amplifier U2, described R18 also is connected to the pin 1 of rear class amplifier U2 by R17; The pin 3 of described rear class amplifier U2 is anodal, connects the 3rd meta power supply and passes through capacitor C 14 ground connection; Pin 4 ground connection of described rear class amplifier U2; The pin 5 of described rear class amplifier U2 is anodal, connects the 4th meta power supply and passes through capacitor C 6 ground connection; The pin 6 of described rear class amplifier U2 is negative pole, and by the pin 7 of capacitor C 7 connection rear class amplifier U2, described R9 also is connected to the pin 7 of rear class amplifier U2 by R8; The pin 7 of described rear class amplifier U2 connects the Audio_L pin of described audio frequency left and right acoustic channels output by capacitor C D2; The pin 8 of described rear class amplifier U2 connects power supply, and respectively by capacitor C 8, C16 ground connection.
Further, described R4=R5=R13=R14, R3=R6=R12=R15, R1=R2=R10=R11, C2=C11, C3=C4=C10=C14, R7=R16, R8=R17, R9=R18, C7=C15.
Further, described capacitor C 1, C5, C6, C8, C9, C13, C14 and C16 are the little electric capacity that is not more than 104F.
Further, described power supply is+9V that described first, second, third, fourth meta power supply is+4.5V.
Further, described first, second, third, fourth meta power supply is made isolation processing; Perhaps described first, second, third, fourth meta power supply is independently power supply.
Further, described prime amplifier U1 is the MFB second-order low-pass filter of the first order, and its flex point is set to 60KHz;
Further, described rear class amplifier U2 is second level low pass filter, and its flex point is set to 80KHz.
The utlity model has following advantage: the audio output circuit that uses double operational, the prime amplifier realizes that mainly the audio frequency differential voltage signal is converted into simulated audio signal, and the realization volume is amplified and second order MFB low-pass filtering, the rear class amplifier is low pass filter, be used for improving tonequality, capacitance-resistance is all used prevailing device, and is beneficial to rational parameters.
Description of drawings
In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.
Fig. 1 is the structural representation of the utility model high tone quality audio output circuit.
Embodiment
As shown in Figure 1, the audio output circuit of high tone quality of the present utility model, use double operational, comprise prime amplifier U1 and rear class amplifier U2, prime amplifier U1 and rear class amplifier U2 are connected between the input of audio frequency differential voltage and the output of audio frequency left and right acoustic channels, and prime amplifier U1 realizes that mainly the audio frequency differential voltage signal is converted into simulated audio signal, and realize volume amplification and second order MFB low-pass filtering, rear class amplifier U2 is low pass filter, is used for improving tonequality.Be convenient diagram, the utility model is divided into two parts with prime amplifier U1 and rear class amplifier U2 and represents, prime amplifier U1 is divided into U1A and U1B, U1A shows that pin 1 to the pin 4 of prime amplifier U1 also has the part annexation of pin 8, and U1B shows that the pin 5 of prime amplifier U1 also has the part annexation of pin 8 to pin 7; Rear class amplifier U2 is divided into U2A and U2B, and U1A shows that pin 1 to the pin 4 of prime amplifier U2 also has the part annexation of pin 8, and U2B shows that the pin 5 of prime amplifier U2 also has the part annexation of pin 8 to pin 7.
Need to prove: the pin 1 of prime amplifier U1 and rear class amplifier U2 to pin 8 just for convenience and to name, be not to refer in particular to certain pin, that is to say, the design of chip is not simultaneously, its annexation can be changed, and both positive and negative polarity, output requirement and the corresponding power pins that only need satisfy the amplifier input get final product.
The pin 1 of described prime amplifier U1 passes through the pin 2 that a capacitor C D3 is connected with resistance R, R18 connects rear class amplifier U2; The pin 2 of described prime amplifier U2 is negative pole, and capacitor C 12, resistance R 15, the R11 by R14, R11 and series connection is connected to the Audio_R_N pin of described audio frequency differential voltage input, and described capacitor C 12 also connects the pin 1 of prime amplifier U1; The pin 3 of described prime amplifier U3 is anodal, by capacitor C 10 ground connection, also connect the first meta power supply by resistance R 13, R12, resistance R 12 is also by capacitor C 9 ground connection, resistance R 13 also is connected to the Audio_R_P pin of described audio frequency differential voltage input by resistance R 10, also be connected with capacitor C 11 between resistance R 13 and the R14; Pin 4 ground connection of described prime amplifier U1; The pin 5 of described prime amplifier U1 is anodal, by capacitor C 3 ground connection, also connects the second meta power supply by resistance R 4, R3, and resistance R 3 is also by capacitor C 1 ground connection, and resistance R 4 also is connected to the Audio_L_P pin of described audio frequency differential voltage input by resistance R 1; The pin 6 of described prime amplifier U1 is negative pole, be connected to the Audio_L_N pin of described audio frequency differential voltage input by capacitor C 4, resistance R 6, the R2 of R5, R2 and series connection, described capacitor C 4 also connects the pin 7 of prime amplifier U1, also is connected with capacitor C 11 between resistance R 4 and the R5; The pin 7 of described prime amplifier U1 passes through the pin 6 that a capacitor C D1 is connected with resistance R, R9 connects rear class amplifier U2; The pin 8 of described prime amplifier U1 connects power supply, and respectively by capacitor C 5, C13 ground connection;
The pin 1 of described rear class amplifier U2 connects the Audio_R pin of described audio frequency left and right acoustic channels output by capacitor C D4; The pin 2 of described rear class amplifier U2 is negative pole, and by the pin 1 of capacitor C 15 connection rear class amplifier U2, described R18 also is connected to the pin 1 of rear class amplifier U2 by R17; The pin 3 of described rear class amplifier U2 is anodal, connects the 3rd meta power supply and passes through capacitor C 14 ground connection; Pin 4 ground connection of described rear class amplifier U2; The pin 5 of described rear class amplifier U2 is anodal, connects the 4th meta power supply and passes through capacitor C 6 ground connection; The pin 6 of described rear class amplifier U2 is negative pole, and by the pin 7 of capacitor C 7 connection rear class amplifier U2, described R9 also is connected to the pin 7 of rear class amplifier U2 by R8; The pin 7 of described rear class amplifier U2 connects the Audio_L pin of described audio frequency left and right acoustic channels output by capacitor C D2; The pin 8 of described rear class amplifier U2 connects power supply, and respectively by capacitor C 8, C16 ground connection.
Aspect the circuit parameter selection, need satisfy following relation, make: R4=R5=R13=R14, R3=R6=R12=R15, R1=R2=R10=R11, C2=C11, C3=C4=C10=C14, R7=R16, R8=R17, R9=R18, C7=C15, but concrete resistance value or capacitance need to be chosen according to actual audition situation.The rule of choosing generally is: the multiplication factor of 1, selecting as required circuit, the different utilization of the multiple that voicefrequency circuit need to amplify is general little identical, can fix like this span of R1 and R6, select again the span of R4 according to different amplifier types, other electric capacity and resistance value are thought according to audition that tonequality meets the demands and are just fixed relevant value, specifically can determine according to side circuit debugging situation.
Amplifier power supply and all meta power supplys will be put little electric capacity nearby, and namely described capacitor C 1, C5, C6, C8, C9, C13, C14 and C16 are little electric capacity, are not more than 104F as good take size.
Because prime amplifier U1 and rear class amplifier U2 use single power supply, need to provide the meta power supply to prime amplifier U1 and rear class amplifier U2, if prime amplifier U1 and rear class amplifier U2 are+the 9V power supply, then the meta power supply is+4.5V, be that described power supply is+9V, described first, second, third, fourth meta power supply is+4.5V.Concrete, described the first meta power supply is A4.5_R, the second meta power supply is that A4.5V_L, the 3rd meta power supply are that A4.5V_R_2 and the 4th meta power supply are four groups of A4.5V_L_2.In order to improve tonequality, four groups of meta power supplys need to be done corresponding isolation processing, can not directly share same group of meta power supply, preferably use independently meta power supply, in order to consider the cost-saving, can be with the meta power supply of prime amplifier U1 and rear class amplifier U2 separately, carry out corresponding isolation processing with two meta power supplys of one-level amplifier.
Described prime amplifier U1 is the MFB second-order low-pass filter of the first order, and its flex point is set to 60KHz; Described rear class amplifier U2 is second level low pass filter, and its flex point is set to 80KHz.This be since the frequency range of audio frequency be 20Hz to 20KHz, arrange so on the one hand and will satisfy audio portion distortion in the 3dB flex point, be for to tonequality audition fixed result out in addition.
As previously mentioned, the utility model uses the audio output circuit of double operational, the prime amplifier realizes that mainly the audio frequency differential voltage signal is converted into simulated audio signal, and the realization volume is amplified and second order MFB low-pass filtering, the rear class amplifier is low pass filter, be used for improving tonequality, capacitance-resistance is all used prevailing device, and is beneficial to rational parameters.
Although more than described embodiment of the present utility model; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present utility model; those of ordinary skill in the art are in modification and the variation of the equivalence of doing according to spirit of the present utility model, all should be encompassed in the scope that claim of the present utility model protects.
Claims (7)
1. the audio output circuit of high tone quality comprises the prime amplifier U1 and the rear class amplifier U2 that are connected between the input of audio frequency differential voltage and the output of audio frequency left and right acoustic channels, it is characterized in that:
The pin 1 of described prime amplifier U1 passes through the pin 2 that a capacitor C D3 is connected with resistance R, R18 connects rear class amplifier U2;
The pin 2 of described prime amplifier U2 is negative pole, and capacitor C 12, resistance R 15, the R11 by R14, R11 and series connection is connected to the Audio_R_N pin of described audio frequency differential voltage input, and described capacitor C 12 also connects the pin 1 of prime amplifier U1;
The pin 3 of described prime amplifier U3 is anodal, by capacitor C 10 ground connection, also connect the first meta power supply by resistance R 13, R12, resistance R 12 is also by capacitor C 9 ground connection, resistance R 13 also is connected to the Audio_R_P pin of described audio frequency differential voltage input by resistance R 10, also be connected with capacitor C 11 between resistance R 13 and the R14;
Pin 4 ground connection of described prime amplifier U1;
The pin 5 of described prime amplifier U1 is anodal, by capacitor C 3 ground connection, also connects the second meta power supply by resistance R 4, R3, and resistance R 3 is also by capacitor C 1 ground connection, and resistance R 4 also is connected to the Audio_L_P pin of described audio frequency differential voltage input by resistance R 1;
The pin 6 of described prime amplifier U1 is negative pole, be connected to the Audio_L_N pin of described audio frequency differential voltage input by capacitor C 4, resistance R 6, the R2 of R5, R2 and series connection, described capacitor C 4 also connects the pin 7 of prime amplifier U1, also is connected with capacitor C 11 between resistance R 4 and the R5;
The pin 7 of described prime amplifier U1 passes through the pin 6 that a capacitor C D1 is connected with resistance R, R9 connects rear class amplifier U2;
The pin 8 of described prime amplifier U1 connects power supply, and respectively by capacitor C 5, C13 ground connection;
The pin 1 of described rear class amplifier U2 connects the Audio_R pin of described audio frequency left and right acoustic channels output by capacitor C D4;
The pin 2 of described rear class amplifier U2 is negative pole, and by the pin 1 of capacitor C 15 connection rear class amplifier U2, described R18 also is connected to the pin 1 of rear class amplifier U2 by R17;
The pin 3 of described rear class amplifier U2 is anodal, connects the 3rd meta power supply and passes through capacitor C 14 ground connection;
Pin 4 ground connection of described rear class amplifier U2;
The pin 5 of described rear class amplifier U2 is anodal, connects the 4th meta power supply and passes through capacitor C 6 ground connection;
The pin 6 of described rear class amplifier U2 is negative pole, and by the pin 7 of capacitor C 7 connection rear class amplifier U2, described R9 also is connected to the pin 7 of rear class amplifier U2 by R8;
The pin 7 of described rear class amplifier U2 connects the Audio_L pin of described audio frequency left and right acoustic channels output by capacitor C D2;
The pin 8 of described rear class amplifier U2 connects power supply, and respectively by capacitor C 8, C16 ground connection.
2. the audio output circuit of high tone quality according to claim 1 is characterized in that: described R4=R5=R13=R14, R3=R6=R12=R15, R1=R2=R10=R11, C2=C11, C3=C4=C10=C14, R7=R16, R8=R17, R9=R18, C7=C15.
3. the audio output circuit of high tone quality according to claim 1 and 2, it is characterized in that: described capacitor C 1, C5, C6, C8, C9, C13, C14 and C16 are the little electric capacity that is not more than 104F.
4. the audio output circuit of high tone quality according to claim 3 is characterized in that: described power supply is+9V, and described first, second, third, fourth meta power supply is+4.5V.
5. the audio output circuit of high tone quality according to claim 4, it is characterized in that: described first, second, third, fourth meta power supply is made isolation processing.
6. the audio output circuit of high tone quality according to claim 4, it is characterized in that: described first, second, third, fourth meta power supply is independently power supply.
7. the audio output circuit of high tone quality according to claim 4 is characterized in that:
Described prime amplifier U1 is the MFB second-order low-pass filter of the first order, and its flex point is set to 60KHz;
Described rear class amplifier U2 is second level low pass filter, and its flex point is set to 80KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120572279 CN202818236U (en) | 2011-12-31 | 2011-12-31 | High tone-quality audio output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120572279 CN202818236U (en) | 2011-12-31 | 2011-12-31 | High tone-quality audio output circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202818236U true CN202818236U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120572279 Expired - Lifetime CN202818236U (en) | 2011-12-31 | 2011-12-31 | High tone-quality audio output circuit |
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| Country | Link |
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| CN (1) | CN202818236U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231496A (en) * | 2016-09-08 | 2016-12-14 | 深圳市冠旭电子股份有限公司 | A kind of based on difference output control circuit and audio amplifier |
| CN110530249A (en) * | 2019-08-30 | 2019-12-03 | 无锡市海鹰工程装备有限公司 | A kind of preamplifier and its inductosyn of inductosyn |
-
2011
- 2011-12-31 CN CN 201120572279 patent/CN202818236U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231496A (en) * | 2016-09-08 | 2016-12-14 | 深圳市冠旭电子股份有限公司 | A kind of based on difference output control circuit and audio amplifier |
| CN110530249A (en) * | 2019-08-30 | 2019-12-03 | 无锡市海鹰工程装备有限公司 | A kind of preamplifier and its inductosyn of inductosyn |
| CN110530249B (en) * | 2019-08-30 | 2021-07-06 | 无锡市海鹰工程装备有限公司 | Preamplifier of induction synchronizer and induction synchronizer thereof |
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Granted publication date: 20130320 |