CN101420205A - Power amplifier for digital audio - Google Patents
Power amplifier for digital audio Download PDFInfo
- Publication number
- CN101420205A CN101420205A CNA2008101804777A CN200810180477A CN101420205A CN 101420205 A CN101420205 A CN 101420205A CN A2008101804777 A CNA2008101804777 A CN A2008101804777A CN 200810180477 A CN200810180477 A CN 200810180477A CN 101420205 A CN101420205 A CN 101420205A
- Authority
- CN
- China
- Prior art keywords
- unit
- digital audio
- audio frequency
- power
- power amplifier
- 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.)
- Pending
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The invention discloses a digital audio power amplifier, comprising a keyboard display unit, a power management unit, a main control unit, a digital audio processing unit, an analog audio processing unit, a multiplexer and a power amplification unit. The digital audio power amplifier is provided with a USB digital audio interface and an analog audio interface, can process the digital audio signals and the analog audio signals without adding A/D converters or D/A converters; meanwhile, the power amplification unit adopts a power driving technology, thus having the performance of high efficiency and low distortion; therefore, the digital audio power amplifier can work normally without heat dissipation equipment.
Description
Technical field
The present invention relates to a kind of audio frequency amplifier, particularly relate to a kind of digital audio frequency power amplifier.
Background technology
Though at present a lot of integrated circuit producers have released digital audio frequency power amplifier, but its interface has only a kind of in simulated audio signal interface or the digital audio interface signal mostly, audio signal is in processing procedure like this, need carry out mould/number, D/A switch repeatedly, can introduce noise thus, make sound quality deterioration; Owing to adopt A/D converter, can cause power dissipation simultaneously, digital audio frequency power amplifier decrease in efficiency, temperature are risen, when work,, need to adopt heat abstractor to reduce temperature for guaranteeing the operate as normal of device.
Therefore, the needs development is a kind of not only to have the USB digital audio interface but also has analog audio interface, and power dissipation is low simultaneously, and the digital audio frequency power amplifier that quantity of heat production is few is to satisfy growing market demand.
Summary of the invention
The objective of the invention is for overcoming above-mentioned defective, a kind of digital audio frequency power amplifier is provided.This digital audio frequency power amplifier not only has the USB digital audio interface but also has analog audio interface, and dissipation power is low, quantity of heat production is few.
The present invention realizes by the following technical solutions:
According to the invention provides a kind of digital audio frequency power amplifier, comprise keyboard display unit, Power Management Unit, main control unit and power amplification unit, wherein, keyboard display unit links to each other with main control unit, be used to receive user's operation input and will operate input and pass to main control unit, the while is to the current state of user feedback power amplifier; Power Management Unit is connected with other unit of power amplifier, is used for providing power supply to each unit of power amplifier; Main control unit is connected with other unit of power amplifier, is used for the keyboard scan input, the operating state of pointing out, being provided with and managing each functional unit; Power amplification unit is connected with outer audio equipment, provides play signal to outer audio equipment.This digital audio frequency power amplifier further comprises digital audio processing unit, analogue audio frequency processing unit and multiplexer, this digital audio processing unit is connected with the USB device of input, be used to receive the input signal of handling external USB equipment, and input signal is converted into analog signal is sent to the analogue audio frequency processing unit; This analogue audio frequency processing unit is connected with extraneous analogue audio frequency equipment with digital audio processing unit, be used to receive the input signal of extraneous analogue audio frequency equipment and the signal of digital audio processing unit input, carry out the switching of digital audio and video signals and analogue audio frequency, selected signal is carried out volume and audio processing, be connected with power amplification unit simultaneously, transmit signals to power amplification unit; This multiplexer is connected with power amplification unit with digital audio processing unit, analogue audio frequency processing unit, signal in the selection digital audio processing unit or the signal ingoing power amplifying unit in the analogue audio frequency processing unit.
In a preferred embodiment of the invention; the digital audio frequency power amplifier main control unit further comprises protection module, and this protection module comprises at least one in flexible temperature control modules, overtemperature protection module, overcurrent protection module, window protection module, under-voltage protection module, overvoltage protective module, voltage asymmetrical protection module and the electrostatic protection module.
In another kind of preferred implementation according to the present invention, main control unit is connected with digital audio processing unit by Serial Peripheral Interface (SPI) (SPI), be connected with the analogue audio frequency processing unit by twin wire universal serial bus (I2C) interface, be connected with keyboard display unit with power amplification unit by direct line.
In another preferred implementation according to the present invention, Power Management Unit has power power-supply output, analog power output and three kinds of modules of digital power output.
Beneficial effect of the present invention is: digital audio frequency power amplifier of the present invention not only has the USB digital audio interface but also has analog audio interface, can handle digital audio and video signals and simulated audio signal, and need not additional mode/number, D/A; Adopt Direct Digital to amplify (DDX) power drive technology at power amplification unit simultaneously, have the performance of high efficiency and low distortion, making this digital audio frequency power amplifier need not heat dissipation equipment just can operate as normal.
Description of drawings
Fig. 1 is each cell distribution schematic diagram of the present invention;
Fig. 2 is a main program flow chart of the present invention; And
Fig. 3 is an event scanning program flow diagram of the present invention.
Reference numeral:
1 keyboard display unit; 2 Power Management Unit; 3 main control units;
4 digital audio processing units; 5 analogue audio frequency processing units;
6 power amplification units; 7 multiplexers; 8 USB device;
9 analogue audio frequency equipment; 10 outer audio equipments.
Embodiment
To be elaborated to preferred implementation of the present invention with reference to the accompanying drawings below.
Fig. 1 shows according to each cell distribution schematic diagram of the present invention, wherein, digital audio frequency power amplifier comprises keyboard display unit 1, Power Management Unit 2, main control unit 3 and power amplification unit 6, it further comprises digital audio processing unit 4, analogue audio frequency processing unit 5 and multiplexer 7, wherein, keyboard display unit 1 links to each other with main control unit 3, be used to receive user's operation input and will operate input and pass to main control unit 3, the while is to the current state of user feedback power amplifier; Power Management Unit 2 is connected with other unit of power amplifier, is used for providing power supply to each unit of power amplifier; Main control unit 3 is used for the keyboard scan input, prompting, the operating state that is provided with and manages each functional unit, it is by SPI interface monitoring digital audio processing unit 4, by I2C interface monitoring analogue audio frequency processing unit 5, by direct line monitor power amplifying unit 6 and keyboard display unit 1; Digital audio processing unit 4 is used for and 8 communications of external USB equipment, audio signal is handled, and be converted into analog signal and send analogue audio frequency processing unit 5 to; Analogue audio frequency processing unit 5 is connected with extraneous analogue audio frequency equipment 9 with digital audio processing unit 4, be used to receive the input signal of extraneous analogue audio frequency equipment 9 and the signal of digital audio processing unit 4 inputs, carry out the switching of digital audio and video signals and analogue audio frequency, selected signal is carried out volume and audio processing, it is connected with power amplification unit 6 simultaneously, transmits signals to power amplification unit 6; Signal in the multiplexer 7 selection digital audio processing units 4 or the signal ingoing power amplifying unit 6 in the analogue audio frequency processing unit 5; Power amplification unit 6 adopts DDX power drive technology, obtains pure audio power signal by filter, and with signal conveys to outer audio equipment 10.In the present embodiment, main control unit 3 adopts the single chip microcontroller AT89C2051 of atmel corp, digital audio processing unit 4 adopts the PCM2704 of TI company, analogue audio frequency processing unit 5 adopts the TDA7318 of ST company, power amplification unit adopts the TDA8932 of Philips company, Power Management Unit 2 for system provide ± power power-supply of 15V ,+analog power of 9V and+digital power of 5V.Simultaneously in the present embodiment, the main control unit 3 of digital audio frequency power amplifier also is provided with at least one in these a series of protection modules of flexible temperature control, overtemperature protection, overcurrent protection, window protection, under-voltage protection, overvoltage protection, voltage asymmetrical protection and electrostatic protection.
In the present embodiment, digital audio frequency power amplifier is supported way word audio frequency input and the input of one road analogue audio frequency, and supports 64 grades of volume controls and quiet control, but also supports 16 grades of high pitch tones and 16 grades of bass tone controls.
Figure 2 shows that main program flow chart of the present invention, the reset mode of digital audio frequency power amplifier comprises electrification reset and push-button reset dual mode, after digital audio frequency power amplifier resets, main control unit 3 is earlier with each functional unit initialization, and from list of thing, read current event, when the user imported by keyboard, main control unit 3 was provided with each functional unit according to customer requirements, and showed in keyboard display unit 1; When USB device 8 was inserted, main control unit 3 was elected to be current play signal to digital audio and video signals with digital audio processing unit 4 initialization; When USB device 8 was extracted, then the forbidden digit audio treatment unit 4, and simulated audio signal is elected to be was current play signal.A kind of preferred embodiment in, on analogue audio frequency equipment 9, use the media renderer plays eroica, on USB device 8, play " Liang shanbo and Zhu yingtai ".When inserting USB device 8, remember in the outer audio equipment 10 " Liang shanbo and Zhu yingtai "; When extracting USB device 8, then outer audio equipment 10 is play eroica.
Fig. 3 shows event scanning program flow diagram of the present invention; when incident takes place; the digital audio frequency power amplifier program interrupt; the interrupt spot is protected; simultaneously; main control unit 3 is the input of keyboard scan display unit 1 and the plug state of USB device 8 circularly, when detecting incident, just changes event handler procedure over to.
More than disclosed only be the preferred embodiments of the present invention, can not limit the scope of the present invention with this certainly.Be appreciated that the equivalent variations of doing according to the present invention's essence defined in the appended claims and scope, still belong to the scope that the present invention is contained.
Claims (4)
1. digital audio frequency power amplifier, comprise: keyboard display unit, Power Management Unit, main control unit and power amplification unit, wherein, described keyboard display unit links to each other with main control unit, be used to receive user's operation input and will operate input and pass to main control unit, the while is to the current state of user feedback power amplifier; Described Power Management Unit is connected with other unit of power amplifier, is used for providing power supply to each unit of power amplifier; Described main control unit is connected with other unit of power amplifier, is used for the keyboard scan input, the operating state of pointing out, being provided with and managing each functional unit; Described power amplification unit is connected with outer audio equipment, provides play signal to outer audio equipment, it is characterized in that, described digital audio frequency power amplifier further comprises:
Digital audio processing unit, it is connected with the USB device of input, is used to receive the input signal of handling external USB equipment, and input signal is converted into analog signal is sent to the analogue audio frequency processing unit;
The analogue audio frequency processing unit, it is connected with extraneous analogue audio frequency equipment with digital audio processing unit, be used to receive the input signal of extraneous analogue audio frequency equipment and the signal of digital audio processing unit input, carry out the switching of digital audio and video signals and analogue audio frequency, selected signal is carried out volume and audio processing, it is connected with power amplification unit simultaneously, transmits signals to power amplification unit;
Multiplexer, it is connected with described power amplification unit with described digital audio processing unit, described analogue audio frequency processing unit, selects signal in the described digital audio processing unit or the signal in the described analogue audio frequency processing unit to enter described power amplification unit.
2. digital audio frequency power amplifier as claimed in claim 1; it is characterized in that; described digital audio frequency power amplifier main control unit further comprises protection module, and described protection module comprises at least one in flexible temperature control modules, overtemperature protection module, overcurrent protection module, window protection module, under-voltage protection module, overvoltage protective module, voltage asymmetrical protection module and the electrostatic protection module.
3. digital audio frequency power amplifier as claimed in claim 1, it is characterized in that, described main control unit is connected with digital audio processing unit by the SPI interface, is connected with the analogue audio frequency processing unit by the I2C interface, is connected with keyboard display unit with power amplification unit by direct line.
4. digital audio frequency power amplifier as claimed in claim 1 is characterized in that, described Power Management Unit has power power-supply output, analog power output and three kinds of modules of digital power output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101804777A CN101420205A (en) | 2008-11-28 | 2008-11-28 | Power amplifier for digital audio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101804777A CN101420205A (en) | 2008-11-28 | 2008-11-28 | Power amplifier for digital audio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101420205A true CN101420205A (en) | 2009-04-29 |
Family
ID=40630850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101804777A Pending CN101420205A (en) | 2008-11-28 | 2008-11-28 | Power amplifier for digital audio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101420205A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105578346A (en) * | 2014-10-31 | 2016-05-11 | 马克西姆综合产品公司 | Group-aware current-limited amplifier and system |
| CN107408925A (en) * | 2015-03-17 | 2017-11-28 | 诺基亚技术有限公司 | The method and apparatus powered to amplifier |
| CN110768632A (en) * | 2018-07-27 | 2020-02-07 | 瑞昱半导体股份有限公司 | Adaptive temperature audio amplifier device and control method thereof |
-
2008
- 2008-11-28 CN CNA2008101804777A patent/CN101420205A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105578346A (en) * | 2014-10-31 | 2016-05-11 | 马克西姆综合产品公司 | Group-aware current-limited amplifier and system |
| CN105578346B (en) * | 2014-10-31 | 2020-03-20 | 马克西姆综合产品公司 | Group-aware current-limited amplifier and system |
| CN107408925A (en) * | 2015-03-17 | 2017-11-28 | 诺基亚技术有限公司 | The method and apparatus powered to amplifier |
| CN107408925B (en) * | 2015-03-17 | 2021-02-12 | 诺基亚技术有限公司 | Method and apparatus for supplying power to an amplifier |
| CN110768632A (en) * | 2018-07-27 | 2020-02-07 | 瑞昱半导体股份有限公司 | Adaptive temperature audio amplifier device and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8694696B2 (en) | Detection method and detection device and multimedia device for high-definition multimedia interface | |
| CN106164886B (en) | Peripheral unit, host apparatus and the processing method of changeable terminal Electricity Functional | |
| CN101420205A (en) | Power amplifier for digital audio | |
| CN102708082A (en) | Method for playing high-fidelity music through mobile terminal, and mobile terminal for same | |
| CN203537473U (en) | Video signal change-over box | |
| CN201608868U (en) | Music center | |
| CN101853560B (en) | RF (radio frequency) remote-controller with an earphone and control method thereof | |
| CN101612476B (en) | Game control device with loudspeaker | |
| CN201479334U (en) | Digital sound box using electric-power line for transmitting information | |
| US20080046767A1 (en) | Power supply and computer using the same | |
| CN203870973U (en) | Integrated intelligent high efficiency digital multimedia playing system | |
| CN102640519B (en) | The apparatus and method of amplification of audio content | |
| CN206759705U (en) | A kind of apparatus for processing audio | |
| TW200930126A (en) | Audio signal hybrid controlling device | |
| CN201146513Y (en) | Digital type train broadcasting machine | |
| CN213126277U (en) | Video capture card for live broadcast | |
| CN210899397U (en) | Multifunctional network broadcast program source | |
| CN102740192B (en) | Multifunctional microphone amplifier | |
| CN201813349U (en) | Family cinema audio power amplifier | |
| CN202153724U (en) | Active combination loudspeaker | |
| CN201018458Y (en) | Complete digital signal processing audio-frequency power amplifier | |
| CN201066879Y (en) | Audio output device for STB/video player | |
| CN201066885Y (en) | Digital/analog integrated machine | |
| CN215300898U (en) | Digital audio signal monitoring and monitoring equipment | |
| CN201789472U (en) | Combined speaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090429 |