CN203734825U - Audio signal processing circuit and audio playing device - Google Patents
Audio signal processing circuit and audio playing device Download PDFInfo
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- CN203734825U CN203734825U CN201420055788.1U CN201420055788U CN203734825U CN 203734825 U CN203734825 U CN 203734825U CN 201420055788 U CN201420055788 U CN 201420055788U CN 203734825 U CN203734825 U CN 203734825U
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Abstract
The utility model belongs to the audio technical field and relates to an audio signal processing circuit and an audio playing device. The audio signal processing circuit provided by the utility model comprises a signal preprocessing module, an audio power amplification chip and a loudspeaker; the input end of the signal preprocessing module is connected with the output end of an audio signal source; a signal input end of the audio power amplification chip is connected with the output end of the signal preprocessing module; a positive output end and a negative output end of the audio power amplification chip are connected with a positive input end and a negative input end of the loudspeaker respectively; a power source end of the audio power amplification chip is connected with the output end of a power source module; a grounding end of the audio power amplification chip is grounded; and the loudspeaker is a loudspeaker of which the impedance is 1 ohm. Since the low-impedance loudspeaker is adopted, the audio signal processing circuit has high output power; and the integrated audio power amplification chip is adopted, the audio signal processing circuit can be used in the audio playing device, so that the size of the audio playing device can be greatly decreased.
Description
Technical field
The utility model belongs to Audiotechnica field, particularly a kind of audio signal processing circuit and audio playing apparatus.
Background technology
Audio playing apparatus is generally comprised of audio signal source, audio amplifier circuit and loud speaker, and it can carry out power amplification processing to the audio signal of audio signal source output by audio amplifier circuit, then converts electrical signals to voice signal by loud speaker.
Yet existing audio playing apparatus generally adopts complicated audio amplifier circuit, not only cost is high, but also takies larger volume.Simultaneously, because the cost of audio amplifier circuit is higher, this class audio frequency playing device generally adopts the loud speaker that cost is lower, impedance is higher, if impedance is the loudspeaker of 2 Ω to 16 Ω, thereby cause the power of whole audio playing apparatus output less, affect user and use.
In sum, there is the problem that power stage is less, volume is larger in existing audio playing circuit.
Utility model content
The purpose of this utility model is to provide a kind of audio signal processing circuit, is intended to solve existing audio playing circuit and has the problem that power stage is less.
The utility model is achieved in that a kind of audio signal processing circuit, is connected with power module with audio signal source;
Described audio signal processing circuit comprises signal pre-processing module, Audio power amplifier chip and loud speaker;
The input of described signal pre-processing module connects the output of described audio signal source, the signal input part of described Audio power amplifier chip connects the output of described signal pre-processing module, and the positive output end of described Audio power amplifier chip and negative output terminal are connected respectively positive input terminal and the negative input end of described loud speaker;
The power end of described Audio power amplifier chip connects the output of power module, the earth terminal ground connection of described Audio power amplifier chip;
Described loud speaker is that impedance is the loudspeaker of 1 Ω.
Another object of the present utility model is also to provide a kind of audio playing apparatus, comprises power module and audio signal source, also comprises above-mentioned audio signal processing circuit.
Audio signal processing circuit provided by the utility model comprises signal pre-processing module, Audio power amplifier chip and loud speaker.Wherein, the input of signal pre-processing module connects the output of audio signal source, the signal input part of Audio power amplifier chip connects the output of signal pre-processing module, and the positive output end of Audio power amplifier chip and negative output terminal are connected respectively positive input terminal and the negative input end of loud speaker; The power end of Audio power amplifier chip connects the output of power module, the earth terminal ground connection of Audio power amplifier chip.And loud speaker is that impedance is the loudspeaker of 1 Ω.Owing to having adopted low-impedance loudspeaker, this audio signal processing circuit has higher power output.And owing to having adopted integrated Audio power amplifier chip, be applied to can greatly reduce on audio playing apparatus the volume of audio playing apparatus.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the audio signal processing circuit that provides of the utility model one embodiment;
Fig. 2 is the exemplary circuit structure chart of the audio signal processing circuit that provides of the utility model one embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Audio signal processing circuit provided by the utility model comprises signal pre-processing module, Audio power amplifier chip and loud speaker.Solve existing audio playing circuit and had the problem that power stage is less.
Fig. 1 shows the modular structure of the audio signal processing circuit that the utility model one embodiment provides, and only shows for convenience of explanation the part relevant to the utility model embodiment, and details are as follows:
The audio signal processing circuit that the utility model embodiment provides is connected with power module 20 with audio signal source 10.
Wherein, audio signal source 10 can be the circuit that microphone, bluetooth module or card reader etc. can output audio signals.Power module 20 can be lithium ion battery or voltage conversion circuit.Voltage conversion circuit can be converted to direct current by inputted alternating current, or directly changes the galvanic magnitude of voltage of institute's input.
Concrete, audio signal processing circuit comprises signal pre-processing module 30, Audio power amplifier chip U1 and loud speaker SPK1.
Wherein, the input of signal pre-processing module 30 connects the output of audio signal source 10, the signal input part IN-of Audio power amplifier chip U1 connects the output of signal pre-processing module 30, and the positive output end OUT+ of Audio power amplifier chip U1 and negative output terminal OUT-are connected respectively positive input terminal and the negative input end of loud speaker SPK1.
The power end VDD of Audio power amplifier chip U1 connects the output of power module 20, the earth terminal GND ground connection of Audio power amplifier chip U1.
Further, loud speaker SPK1 can be that impedance is the loudspeaker of 1 Ω.Owing to adopting the loudspeaker of little impedance, make Audio power amplifier chip U1 can there is more high-power output.
Further, the model of Audio power amplifier chip U1 can be AP8107.AP8107 is the monophony D class audio amplifier of a high efficiency, the reactive filter produced of Shenzhen Bai Tai Industrial Co., Ltd..In the situation that coordinate the loudspeaker of 1 Ω, its power output can be up to 9W.
Further, as shown in Figure 2, audio signal processing circuit can also be connected with control module 40; Audio signal processing circuit also comprises filtration module 50;
The control end of control module 40 connects the input of filtration module 50, and the output of filtration module 50 connects the switch controlled end SD of Audio power amplifier chip U1.
In the present embodiment, control module 40 can, by Audio power amplifier chip U1 output switching signal, start working it or enter holding state.Control module 40 can be outside singlechip chip, as 80C51.Control module 40 can be also a switch, and the other end of switch connects power module 20, and user can export by console switch the switching signal of varying level to Audio power amplifier chip U1.
As the utility model one embodiment, as shown in Figure 2, audio signal processing circuit can also comprise the first magnetic bead M1 being serially connected with between the positive output end OUT+ of Audio power amplifier chip U1 and the positive input terminal of loud speaker SPK1; The first end of the first magnetic bead M1 connects the positive output end OUT+ of Audio power amplifier chip U1, and the second end of the first magnetic bead M1 connects the positive input terminal of loud speaker SPK1.
Further, audio signal processing circuit can also comprise the second magnetic bead M2 being serially connected with between the negative output terminal OUT-of Audio power amplifier chip U1 and the negative input end of loud speaker SPK1; The first end of the second magnetic bead M2 connects the negative output terminal OUT-of Audio power amplifier chip U1, and the second end of the second magnetic bead M2 connects the negative input end of loud speaker SPK1.
In the present embodiment, owing to having adopted low-impedance loudspeaker, the power of Audio power amplifier chip U1 output is higher, and its output current is also larger.Therefore, the process of current delivery has larger electromagnetic radiation.By the first magnetic bead M1 and the second magnetic bead M2 are set, can effectively reduce electromagnetic radiation.
As the utility model one embodiment, as shown in Figure 2, signal pre-processing module 30 can comprise the first resistance R 1 and the first capacitor C 1;
The first end of the first capacitor C 1 is the input of signal pre-processing module 30, and the second end of the first capacitor C 1 connects the first end of the first resistance R 1, and the second end of the first resistance R 1 is the output of signal pre-processing module 30.
In the present embodiment, signal pre-processing module 30 can carry out signal coupling to received audio signal by the first resistance R 1 and the first capacitor C 1, and regulates the gain to audio signal.
As the utility model one embodiment, as shown in Figure 2, filtration module 50 can comprise the second resistance R 2 and the second capacitor C 2;
The first end of the second resistance R 2 is inputs of filtration module 50, and the second end of the second resistance R 2 and the first end of the second capacitor C 2 connect the output that forms filtration module 50, the second end ground connection of the second capacitor C 2 altogether.
In the present embodiment, filtration module 50 is by the interference signal in the second resistance R 2 and the second capacitor C 2 switching signal that effectively filtering is inputted.
Further, as shown in Figure 2, audio signal processing circuit can also comprise the 3rd capacitor C 3;
The reference voltage end BYPASS of Audio power amplifier chip U1 connects the first end of the 3rd capacitor C 3, the second end ground connection of the 3rd capacitor C 3.
Further, audio signal processing circuit can also comprise the 4th capacitor C 4 and the 5th capacitor C 5;
The first end of the first end of the 4th capacitor C 4 and the 5th capacitor C 5 is connected to the power end VDD of Audio power amplifier chip U1 altogether, and the second end of the second end of the 4th capacitor C 4 and the 5th capacitor C 5 is connected to ground altogether.
Another object of the present utility model is also to provide a kind of audio playing apparatus, comprises power module 20 and audio signal source 10, it is characterized in that, audio playing apparatus also comprises above-mentioned audio signal processing circuit.
In the present embodiment, owing to having adopted low-impedance loudspeaker, and adopted integrated Audio power amplifier chip U1, be applied on audio playing apparatus, not only make audio playing apparatus there is higher power output, can also greatly reduce the volume of audio playing apparatus.
Further, audio signal source 10 can be bluetooth module, microphone or card reader.
In the present embodiment, by changing the type of audio signal source 10, audio playing apparatus can be designed as different products, as high-power loudspeaker, portable loudspeaker box, card-inserted sound box, USB speaker etc.
Further, power module 20 can be lithium ion battery or voltage conversion circuit.
In the present embodiment, by adopting different power module 20, audio playing apparatus can be selected wired power supply, and volume is further dwindled; Also can select powered battery, and strengthen its portability.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. an audio signal processing circuit, is connected with power module with audio signal source; It is characterized in that:
Described audio signal processing circuit comprises signal pre-processing module, Audio power amplifier chip and loud speaker;
The input of described signal pre-processing module connects the output of described audio signal source, the signal input part of described Audio power amplifier chip connects the output of described signal pre-processing module, and the positive output end of described Audio power amplifier chip and negative output terminal are connected respectively positive input terminal and the negative input end of described loud speaker;
The power end of described Audio power amplifier chip connects the output of described power module, the earth terminal ground connection of described Audio power amplifier chip;
Described loud speaker is that impedance is the loudspeaker of 1 Ω.
2. audio signal processing circuit as claimed in claim 1, is characterized in that, the model of described Audio power amplifier chip is AP8107.
3. audio signal processing circuit as claimed in claim 1, is characterized in that, described audio signal processing circuit also comprises the first magnetic bead being serially connected with between the positive output end of described Audio power amplifier chip and the positive input terminal of described loud speaker;
The first end of described the first magnetic bead connects the positive output end of described Audio power amplifier chip, and the second end of described the first magnetic bead connects the positive input terminal of described loud speaker.
4. audio signal processing circuit as claimed in claim 1, is characterized in that, described audio signal processing circuit also comprises the second magnetic bead being serially connected with between the negative output terminal of described Audio power amplifier chip and the negative input end of described loud speaker;
The first end of described the second magnetic bead connects the negative output terminal of described Audio power amplifier chip, and the second end of described the second magnetic bead connects the negative input end of described loud speaker.
5. audio signal processing circuit as claimed in claim 1, is characterized in that, described signal pre-processing module comprises the first resistance and the first electric capacity;
The first end of described the first electric capacity is the input of described signal pre-processing module, and the second end of described the first electric capacity connects the first end of described the first resistance, and the second end of described the first resistance is the output of described signal pre-processing module.
6. audio signal processing circuit as claimed in claim 1, is characterized in that, described audio signal processing circuit is also connected with control module;
Described audio signal processing circuit also comprises filtration module;
The control end of described control module connects the input of described filtration module, and the output of described filtration module connects the switch controlled end of described Audio power amplifier chip.
7. audio signal processing circuit as claimed in claim 6, is characterized in that, described filtration module comprises the second resistance and the second electric capacity;
The first end of described the second resistance is the input of described filtration module, and the second end of described the second resistance and the first end of described the second electric capacity connect the output that forms described filtration module, the second end ground connection of described the second electric capacity altogether.
8. audio signal processing circuit as claimed in claim 1, is characterized in that, described audio signal processing circuit also comprises the 3rd electric capacity;
The reference voltage end of described Audio power amplifier chip connects the first end of described the 3rd electric capacity, the second end ground connection of described the 3rd electric capacity.
9. an audio playing apparatus, comprises power module and audio signal source, it is characterized in that, described audio playing apparatus also comprises the audio signal processing circuit described in claim 1 to 8 any one.
10. audio playing apparatus as claimed in claim 9, is characterized in that, described audio signal source is bluetooth module, microphone or card reader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420055788.1U CN203734825U (en) | 2014-01-28 | 2014-01-28 | Audio signal processing circuit and audio playing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420055788.1U CN203734825U (en) | 2014-01-28 | 2014-01-28 | Audio signal processing circuit and audio playing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203734825U true CN203734825U (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420055788.1U Expired - Fee Related CN203734825U (en) | 2014-01-28 | 2014-01-28 | Audio signal processing circuit and audio playing device |
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|---|---|
| CN (1) | CN203734825U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454623A (en) * | 2016-10-24 | 2017-02-22 | 深圳市赛音电子有限公司 | High-power loudspeaker box |
| CN115037257A (en) * | 2022-08-11 | 2022-09-09 | 上海芯龙半导体技术股份有限公司南京分公司 | Audio power amplifying circuit and audio power amplifying chip |
-
2014
- 2014-01-28 CN CN201420055788.1U patent/CN203734825U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454623A (en) * | 2016-10-24 | 2017-02-22 | 深圳市赛音电子有限公司 | High-power loudspeaker box |
| CN115037257A (en) * | 2022-08-11 | 2022-09-09 | 上海芯龙半导体技术股份有限公司南京分公司 | Audio power amplifying circuit and audio power amplifying chip |
| CN115037257B (en) * | 2022-08-11 | 2022-12-27 | 上海芯龙半导体技术股份有限公司南京分公司 | Audio power amplifying circuit and audio power amplifying chip |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20170128 |