CN204408602U - There is the sound equipment of USB interface - Google Patents
There is the sound equipment of USB interface Download PDFInfo
- Publication number
- CN204408602U CN204408602U CN201520025030.8U CN201520025030U CN204408602U CN 204408602 U CN204408602 U CN 204408602U CN 201520025030 U CN201520025030 U CN 201520025030U CN 204408602 U CN204408602 U CN 204408602U
- Authority
- CN
- China
- Prior art keywords
- audio
- frequency power
- power amplifier
- signal
- interface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Circuit For Audible Band Transducer (AREA)
- Amplifiers (AREA)
Abstract
The utility model is applicable to sound technique field, and the utility model provides the sound equipment with USB interface, and it comprises sound equipment and comprises USB interface, audio interface, audio processing chip, audio frequency power amplifier chip and loud speaker; When audio interface is in vacant state, audio processing chip converts voice data to digital audio and video signals according to the first control signal, and digital audio and video signals is sent to audio frequency power amplifier chip, audio frequency power amplifier chip is sent to loud speaker after digital audio and video signals being carried out amplification and digital-to-analogue conversion according to the first control signal; When audio interface accessing to audio plug, audio processing chip is in off state according to the second control signal, audio frequency power amplifier chip is sent to loud speaker after being amplified by simulated audio signal according to the second control signal, both can choice for use USB as the connected mode of input signal, also can select USB as power supply, use tone frequency channel wire as input, user-friendly, high-quality transmission tonequality can be realized.
Description
Technical field
The utility model relates to sound technique field, particularly relates to a kind of sound equipment with USB interface.
Background technology
Along with the development of portable audio, user more and more uses tabletop sound, portable audio of the prior art adopts USB interface to provide power supply usually, the power supply capacity of USB interface is also from 500mA, rise to 1A, peak power output can reach 5 watts, the portable audio that current employing USB powers, as shown in Figure 1, comprise: a USB line, a tone frequency channel wire, audio frequency power amplifier chip, sound chamber and loudspeaker, USB line provides the power supply of 5V to audio frequency power amplifier chip from main USB controller (as computer), audio signal inputs to audio frequency power amplifier chip from computer etc., after audio frequency power amplifier chip amplifies audio signal, drive loudspeaker to sound.But this traditional USB sound equipment, exists two problems, one is needs two lines, and wherein USB line is used for power supply, and another root tone frequency channel wire is used for transmission of audio signal, and the utilance of two lines is lower; Other problem is the simulated audio signal of tone frequency channel wire transmission, simulated audio signal is subject to extraneous noise jamming in transmitting procedure, and during the audio signal analog signal output of computer own, signal to noise ratio (SNR) can reduce, generally can be reduced to about 70dB, add extraneous interference, SNR can be reduced to about 66dB, very large to tonequality damage, and the SNR theoretical value of 16 bit digital audio signals of current common use is 96dB.In sum, there is the utilance of tone frequency channel wire and USB line in prior art low and use tone frequency channel wire can cause the problem of damage to tonequality.
Utility model content
The purpose of this utility model is to provide a kind of sound equipment with USB interface, low and use tone frequency channel wire can cause the problem of damage to tonequality to solve in prior art the utilance that there is tone frequency channel wire and USB line.
Utility model provides a kind of sound equipment with USB interface, and described sound equipment comprises USB interface, audio interface, audio processing chip, audio frequency power amplifier chip and loud speaker;
The data input pin of described audio processing chip is connected described USB interface with voltage input end, the control end of described audio processing chip connects described audio interface, the data output end of described audio processing chip connects the digital audio signal input of described audio frequency power amplifier chip, the voltage input end of described audio frequency power amplifier chip connects described USB interface, the simulated audio signal input of described audio frequency power amplifier chip is connected described audio interface with control end, and the output of described audio frequency power amplifier chip connects described loud speaker;
When described USB interface is connected with external equipment, the voltage exported by described external equipment is described audio processing chip and described audio frequency power amplifier chip power supply, and the voice data that described external equipment exports is sent to described audio processing chip;
The first control signal is generated when described audio interface is in vacant state, described first control signal is sent to described audio processing chip and described audio frequency power amplifier chip by described audio interface, described audio processing chip converts described voice data to digital audio and video signals according to described first control signal, and described digital audio and video signals is sent to described audio frequency power amplifier chip, described audio frequency power amplifier chip is sent to described loud speaker after described digital audio and video signals being carried out amplification and digital-to-analogue conversion according to described first control signal;
The second control signal is generated when described audio interface accessing to audio plug, described second control signal is sent to described audio processing chip and described audio frequency power amplifier chip by described audio interface, and the simulated audio signal that described external equipment sends is sent to described audio frequency power amplifier chip, described audio processing chip is in off state according to described second control signal, and described audio frequency power amplifier chip is sent to described loud speaker after being amplified by described simulated audio signal.
Described audio frequency power amplifier chip comprises analog signal amplifier, digital signal amplifier, digital to analog converter and driver;
The input of described analog signal amplifier is the simulated audio signal input of described audio frequency power amplifier chip, the output of described analog signal amplifier connects the first input end of described driver, the input of described digital signal amplifier is the digital audio signal input of described audio frequency power amplifier chip, the output of described digital signal amplifier connects the input of described digital to analog converter, the output of described digital to analog converter connects the second input of described driver, and the output of described driver is the output of described audio frequency power amplifier chip.
Described audio interface comprises earth terminal, the first signal end, secondary signal end and the 3rd signal end;
When described audio interface accessing to audio plug, the ground wire of described audio jack, described earth terminal and described first signal end are interconnected, and are low level second control signal to generate level.
Described audio interface also comprises pull-up circuit, and described pull-up circuit is connected with described first signal end;
When described audio interface is in vacant state, described pull-up circuit generates the second control signal that level is high level.
Described pull-up circuit comprises pull-up resistor and driving power.
A kind of sound equipment and control method thereof with USB interface that the utility model provides, according to the control signal that audio interface sends, both can choice for use USB as the connected mode of input signal, support plug and play under windows system; Also can select USB as power supply simultaneously, use tone frequency channel wire as input, use as traditional sound equipment, a tone frequency channel wire can be saved when connecting computer USB interface, user-friendly, can realize high-quality transmission tonequality, lossless audio transmits, simplify the operation of user simultaneously, and reduce the requirement to audio frequency output performances such as computers.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structure chart with the sound equipment of USB interface that prior art provides;
Fig. 2 is a kind of structural representation with the sound equipment of USB interface that a kind of embodiment of the utility model provides;
Fig. 3 is the structural representation of a kind of audio frequency power amplifier chip had in the sound equipment of USB interface that a kind of embodiment of the utility model provides;
Fig. 4 is the structural representation of a kind of audio interface accessing to audio joint had in the sound equipment of USB interface that a kind of embodiment of the utility model provides;
Fig. 5 is a kind of flow chart with the control method of the sound equipment of USB interface that a kind of embodiment of the utility model provides;
Fig. 6 is a kind of another flow chart with the control method of the sound equipment of USB interface that a kind of embodiment of the utility model provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In order to the technical solution of the utility model is described, be described below by specific embodiment.
The utility model embodiment provides a kind of sound equipment with usb 1 01, refers to Fig. 2, and sound equipment comprises usb 1 01, audio interface 102, audio processing chip 103, audio frequency power amplifier chip 104 and loud speaker 105.
The data input pin of audio processing chip 103 is connected usb 1 01 with voltage input end, the control end of audio processing chip 103 connects audio interface 102, the data output end of audio processing chip 103 connects the digital audio signal input of audio frequency power amplifier chip 104, the voltage input end of audio frequency power amplifier chip 104 connects usb 1 01, the simulated audio signal input of audio frequency power amplifier chip 104 is connected audio interface 102 with control end, and the output of audio frequency power amplifier chip 104 connects loud speaker 105.
When usb 1 01 is connected with external equipment, the voltage exported by external equipment is that audio processing chip 103 and audio frequency power amplifier chip 104 are powered, and the voice data that external equipment exports is sent to audio processing chip 103.
The first control signal is generated when audio interface 102 is in vacant state, first control signal is sent to audio processing chip 103 and audio frequency power amplifier chip 104 by audio interface 102, audio processing chip 103 converts voice data to digital audio and video signals according to the first control signal, and digital audio and video signals is sent to audio frequency power amplifier chip 104, audio frequency power amplifier chip 104 is sent to loud speaker 105 after digital audio and video signals being carried out amplification and digital-to-analogue conversion according to the first control signal.
The second control signal is generated when audio interface 102 accessing to audio plug, second control signal is sent to audio processing chip 103 and audio frequency power amplifier chip 104 by audio interface 102, and the simulated audio signal that external equipment sends is sent to audio frequency power amplifier chip 104, audio processing chip 103 is in off state according to the second control signal, and audio frequency power amplifier chip 104 is sent to loud speaker 105 after being amplified by simulated audio signal.
The utility model uses the audio chip supporting USB input as the audio processing chip 103 of sound equipment, audio frequency power amplifier is used to drive loud speaker 105, when the usb 1 01 of USB sound equipment is connected to external equipment, such as computer, computer identifies audio processing chip 103 automatically, and automatic load driver, be configured to the audio frequency apparatus that can play, just can automatically switch this equipment audio output apparatus by default, and after this, the sound play on computers is just sent by this USB sound equipment.
When connecting usb 1 01, if when connecting tone frequency channel wire again to the audio interface 102 of USB sound equipment, computer identification before the audio frequency apparatus used disconnect automatically, and are switched to audio output apparatus work.Sound equipment operating state is now: use USB line to power, and by audio interface 102 signal input part by default, and amplify audio signal to loud speaker 105.
Optionally, as shown in Figure 3, audio frequency power amplifier chip 104 comprises analog signal amplifier 1041, digital signal amplifier 1043, digital to analog converter 1044 and driver 1042.
The input of analog signal amplifier 1041 is the simulated audio signal input of audio frequency power amplifier chip 104, the output of analog signal amplifier 1041 connects the first input end of driver 1042, the input of digital signal amplifier 1043 is the digital audio signal input of audio frequency power amplifier chip 104, the input of the output linking number weighted-voltage D/A converter 1044 of digital signal amplifier 1043, the output of digital to analog converter 1044 connects the second input of driver 1042, and the output of driver 1042 is the output of audio frequency power amplifier chip 104.
Analog signal amplifier 1041 exports to driver 1042 after being amplified by simulated audio signal, digital signal amplifier 1043 exports to digital to analog converter 1044 after being amplified by digital audio and video signals, and digital to analog converter 1044 sends to driver 1042 after converting digital audio and video signals to simulated audio signal.
Optionally, as shown in Figure 4, audio interface 102 comprises earth terminal A, the first signal end B, secondary signal end C and the 3rd signal end D.
When audio interface 102 accessing to audio plug 110, ground wire a, earth terminal A and the first signal end B of audio jack 110 are interconnected, and are low level second control signal to generate level.
Optionally, audio interface 102 also comprises pull-up circuit, and pull-up circuit is connected with the first signal end B.
When audio interface 102 is in vacant state, pull-up circuit generates the second control signal that level is high level.
Pull-up circuit comprises pull-up resistor and driving power.
In the utility model, the interface of USB sound equipment outside is 3.5mm stereo audio interface 102 and usb 1 01, uses stereo audio line to be connected with USB line.USB line must be inserted, to provide the power supply needed for work during sound equipment work.
The control signal that audio interface 102 produces determines the working method of sound equipment, when control signal is high level, audio processing chip 103 is in running order, the mode being converted into digital audio with the data of compunlcation outputs to audio frequency power amplifier chip 104, audio frequency power amplifier chip 104 can support digital-to-analog two kinds of audio frequency input modes, when control signal is 1, the input mode of audio frequency power amplifier chip 104 is digital audio and video signals input, and digital audio and video signals input is amplified through decoding, DAC conversion exports loudspeaker to.
When control signal is 0, audio processing chip 103 is in closed condition, and computer detection is less than this audio frequency apparatus, and the acquiescence output equipment of computer end naturally can be switched to analogue audio frequency and export.The input mode of audio frequency power amplifier chip 104 is switched to analog input, directly amplifies the simulated audio signal from computer or other equipment.
Control signal, while shutoff audio processing chip 103, makes audio frequency power amplifier chip 104 be switched to analog input.And while opening audio processing chip 103, audio frequency power amplifier chip 104 is switched to digital audio and video signals input, enable sound equipment switch operating state at any time.Employ four end audio interface 102 at the audio input port of USB sound equipment, and tone frequency channel wire uses common stereo audio line.Four end audio frequency are widely used in mobile phone, are characterized in using same 3.5mm interface, and are divided into two by the GND of stereo audio interface 102 end, are mainly used to connect microphone.This design can use four end audio sockets in USB sound equipment, when inserting stereo audio interface 102, A, B end then on socket can link together, and B end is owing to producing control signal, A end is ground, then formation control signal is the state of 0, and USB sound equipment is operated in the mode of analogue audio frequency input.When extracting tone frequency channel wire, the connection between A and B disconnects, and control signal is in vacant state, and when there being pull-up circuit, then control signal is high level, and USB sound equipment is operated in the mode of USB input.
The utility model also provides a kind of based on the above-mentioned control method with the sound equipment of usb 1 01, and as shown in Figure 5 and Figure 6, control method comprises the following steps:
The voltage that external equipment exports, when usb 1 01 is connected with external equipment, is used for powering to audio processing chip 103 and audio frequency power amplifier chip 104 by step S201., and the voice data that external equipment exports is sent to audio processing chip 103.
Step S202. is when audio interface 102 is in vacant state, and audio interface 102 generates the first control signal, and the first control signal is sent to audio processing chip 103 and audio frequency power amplifier chip 104.
Step S203. audio processing chip 103 converts voice data to digital audio and video signals according to the first control signal, and digital audio and video signals is sent to audio frequency power amplifier chip 104;
Step S204. audio frequency power amplifier chip 104 is sent to loud speaker 105 after digital audio and video signals being carried out amplification and digital-to-analogue conversion according to the first control signal;
Step S205. is when audio interface 102 accessing to audio plug, audio interface 102 generates the second control signal, second control signal is sent to audio processing chip 103 and audio frequency power amplifier chip 104, and the simulated audio signal that external equipment sends is sent to audio frequency power amplifier chip 104;
Step S206. audio processing chip 103 is in off state according to the second control signal;
Loud speaker 105 is sent to after simulated audio signal amplifies by step S207. audio frequency power amplifier chip 104.
Optionally, audio interface 102 comprises earth terminal, the first signal end, secondary signal end and the 3rd signal end;
The step generating the second control signal during audio interface 102 accessing to audio plug is specially:
The ground wire of audio jack, earth terminal and the first signal end are interconnected, and are low level second control signal to generate level.
Optionally, audio interface 102 also comprises pull-up circuit, and pull-up circuit is connected with the first signal end;
Audio interface 102 generates the first control signal step when being in vacant state is specially:
Pull-up circuit generates the second control signal that level is high level.
A kind of sound equipment with USB interface that the utility model provides, according to the control signal that audio interface sends, both can choice for use USB as the connected mode of input signal, support plug and play under windows system; Also can select USB as power supply simultaneously, use tone frequency channel wire as input, use as traditional sound equipment, a tone frequency channel wire can be saved when connecting computer USB interface, user-friendly, can realize high-quality transmission tonequality, lossless audio transmits, simplify the operation of user simultaneously, and reduce the requirement to audio frequency output performances such as computers.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; make some equivalent alternative or obvious modification without departing from the concept of the premise utility; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the utility model is determined by submitted to claims.
Claims (5)
1. have a sound equipment for USB interface, it is characterized in that, described sound equipment comprises USB interface, audio interface, audio processing chip, audio frequency power amplifier chip and loud speaker;
The data input pin of described audio processing chip is connected described USB interface with voltage input end, the control end of described audio processing chip connects described audio interface, the data output end of described audio processing chip connects the digital audio signal input of described audio frequency power amplifier chip, the voltage input end of described audio frequency power amplifier chip connects described USB interface, the simulated audio signal input of described audio frequency power amplifier chip is connected described audio interface with control end, and the output of described audio frequency power amplifier chip connects described loud speaker;
When described USB interface is connected with external equipment, the voltage that described external equipment is exported is described audio processing chip and described audio frequency power amplifier chip power supply, and the voice data that described external equipment exports is sent to described audio processing chip;
When described audio interface is in vacant state, described audio interface generates the first control signal, and described first control signal is sent to described audio processing chip and described audio frequency power amplifier chip, described audio processing chip converts described voice data to digital audio and video signals according to described first control signal, and described digital audio and video signals is sent to described audio frequency power amplifier chip, described audio frequency power amplifier chip is sent to described loud speaker after described digital audio and video signals being carried out amplification and digital-to-analogue conversion according to described first control signal;
When described audio interface accessing to audio plug, described audio interface generates the second control signal, and described second control signal is sent to described audio processing chip and described audio frequency power amplifier chip, and the simulated audio signal that described external equipment sends is sent to described audio frequency power amplifier chip, described audio processing chip is in off state according to described second control signal, and described audio frequency power amplifier chip is sent to described loud speaker after being amplified by described simulated audio signal according to described second control signal.
2. sound equipment as claimed in claim 1, it is characterized in that, described audio frequency power amplifier chip comprises analog signal amplifier, digital signal amplifier, digital to analog converter and driver;
The input of described analog signal amplifier is the simulated audio signal input of described audio frequency power amplifier chip, the output of described analog signal amplifier connects the first input end of described driver, the input of described digital signal amplifier is the digital audio signal input of described audio frequency power amplifier chip, the output of described digital signal amplifier connects the input of described digital to analog converter, the output of described digital to analog converter connects the second input of described driver, and the output of described driver is the output of described audio frequency power amplifier chip.
3. sound equipment as claimed in claim 2, it is characterized in that, described audio interface comprises earth terminal, the first signal end, secondary signal end and the 3rd signal end;
When described audio interface accessing to audio plug, the ground wire of described audio jack and described earth terminal and described first signal end are interconnected, and are low level second control signal to generate level.
4. sound equipment as claimed in claim 3, it is characterized in that: described audio interface also comprises pull-up circuit, described pull-up circuit is connected with described first signal end;
When described audio interface is in vacant state, described pull-up circuit generates the second control signal that level is high level.
5. sound equipment as claimed in claim 4, is characterized in that: described pull-up circuit comprises pull-up resistor and driving power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520025030.8U CN204408602U (en) | 2015-01-14 | 2015-01-14 | There is the sound equipment of USB interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520025030.8U CN204408602U (en) | 2015-01-14 | 2015-01-14 | There is the sound equipment of USB interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204408602U true CN204408602U (en) | 2015-06-17 |
Family
ID=53432430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520025030.8U Expired - Fee Related CN204408602U (en) | 2015-01-14 | 2015-01-14 | There is the sound equipment of USB interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204408602U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851479A (en) * | 2017-02-13 | 2017-06-13 | 维沃移动通信有限公司 | A kind of audio playing apparatus and method |
-
2015
- 2015-01-14 CN CN201520025030.8U patent/CN204408602U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851479A (en) * | 2017-02-13 | 2017-06-13 | 维沃移动通信有限公司 | A kind of audio playing apparatus and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8891803B2 (en) | Notebook power supply with integrated subwoofer | |
| CN102857228A (en) | Electronic equipment and audio output control method thereof | |
| CN102387429B (en) | Audio signal switching device and audio signal transmission system | |
| CN202634685U (en) | Mobile terminal for playing hi-fi music | |
| CN108513224A (en) | Wireless microphone based on Bluetooth BLE transmission | |
| WO2009080027A1 (en) | Two-channel amplifier with common signal | |
| CN204408602U (en) | There is the sound equipment of USB interface | |
| CN104581505A (en) | Sound box with USB interface and control method of sound box | |
| JP2020501400A (en) | earphone | |
| CN103794200A (en) | Portable karaoke device capable of achieving audio access based on WIFI | |
| CN102065160A (en) | Circuit for being externally connected with loudspeaker by utilizing mobile phone | |
| CN203387659U (en) | Multifunctional sound equipment control circuit | |
| CN203840507U (en) | Bluetooth stereo | |
| US20170310280A1 (en) | Single signal-variant power supply for a plurality of amplifiers | |
| CN212259318U (en) | Bluetooth desktop loudspeaker box with wireless microphone | |
| CN105307085B (en) | A kind of chargeable audio amplification device | |
| CN203387650U (en) | Novel audio sharing device | |
| CN102307245B (en) | Audio frequency channel data access device | |
| CN202050447U (en) | Circuit capable of connecting mobile phone with external loudspeaker | |
| CN207589106U (en) | A kind of earphone | |
| CN104967945A (en) | Headphone power amplifier and method for controlling same | |
| CN206461747U (en) | A kind of Baffle Box of Bluetooth | |
| CN205987270U (en) | Type of digifax mixed type C plug earphone | |
| CN206099991U (en) | Audio communication system based on laser | |
| US9584082B1 (en) | Systems and methods for supply-based gain control of an audio output signal |
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: 20150617 Termination date: 20160114 |