CN214281656U

CN214281656U - DSP digital power amplifier based on multichannel sound source

Info

Publication number: CN214281656U
Application number: CN202120094407.0U
Authority: CN
Inventors: 张常华; 朱正辉; 赵定金
Original assignee: Guangzhou Baolun Electronics Co Ltd
Current assignee: Guangdong Baolun Electronics Co ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-09-24
Anticipated expiration: 2031-01-13

Abstract

The utility model discloses a DSP digital power amplifier based on multichannel sound source, including the power amplifier module, DSP control processing module and sound source selection module, the sound source selection module is including the BGM interface that is used for acquireing the BGM signal, a DVD interface for acquireing the DVD signal, a simulation electronic switch U17 for acquireing the VCD interface of VCD signal and being used for switching input signal, the output of BGM interface is connected with simulation electronic switch U17's first input IN1, the output of DVD interface is connected with simulation electronic switch U17's second input IN2, the output of VCD interface is connected with simulation electronic switch U17's third input IN3, simulation electronic switch U17's output OUT is connected with DSP control processing module's input, DSP control processing module's output is connected with the input of power amplifier module, the output of power amplifier module is external to have the speaker. The utility model discloses in, select module extension interface through the sound source to make DSP digital power amplifier can insert the audio signal of more types.

Description

DSP digital power amplifier based on multichannel sound source

Technical Field

The utility model relates to an audio signal handles technical field, especially relates to a DSP digital power amplifier based on multichannel sound source.

Background

In public sound amplification occasions such as multimedia classrooms, meetings, exhibition halls and the like, a multimedia power amplifier (digital power amplifier) is generally adopted as power amplification for sound amplification, and the traditional multimedia power amplifier generally only provides 2 groups of circuit inputs and 3 groups of microphone inputs and cannot meet the requirements of increasing digital sound source interfaces. Especially, an old multimedia sound amplifying system is often provided with only a DVD or VCD connector, and has a difference from an interface of a currently popular multimedia power amplifier, and the connection must be realized by an adapter, and meanwhile, the old multimedia power amplifier is not compatible with functions of bluetooth, optical fiber and the like, so that the experience of a user is seriously influenced, and the cost of using the multimedia power amplifier as power amplification for sound amplification is increased.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide a DSP digital power amplifier based on multichannel sound source, its multimedia power amplifier audio interface quantity that can solve present and type are too few, have restricted the problem of the sound source kind that multimedia power amplifier can insert.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a DSP digital power amplifier based on a multichannel sound source comprises a power amplifier module, a DSP control processing module and a sound source selection module, wherein the sound source selection module comprises a BGM interface for acquiring a BGM signal, a DVD interface for acquiring a DVD signal, a VCD interface for acquiring a VCD signal and an analog electronic switch U17 for switching an input signal, the output end of the BGM interface is connected with a first input end IN1 of an analog electronic switch U17, the output end of the DVD interface is connected with a second input end IN2 of the analog electronic switch U17, the output end of the VCD interface is connected with a third input end IN3 of the analog electronic switch U17, the output end OUT of the analog electronic switch U17 is connected with the input end of the DSP control processing module, the output end of the DSP control processing module is connected with the input end of the power amplifier module, and the output end of the power amplifier module is externally connected with a loudspeaker.

Preferably, the DSP control processing module includes an analog component for acquiring an analog signal, an optical fiber component for acquiring an optical fiber signal, a coaxial component for acquiring a microphone signal, a digital component for acquiring a digital signal, a bluetooth component for acquiring a bluetooth signal, and a DSP control processor U2 for switching an input signal and modulating an audio sound effect, the analog component, the optical fiber component, the coaxial component, the digital component, and the bluetooth component are all connected with an input end of the DSP control processor U2, and an output end of the DSP control processor U2 is connected with an input end of the power amplifier module.

Preferably, the coaxial assembly comprises an amplifying circuit and a microphone interface for externally connecting a microphone, and the microphone interface is connected with an input MIC1_ IN of the DSP control processor U2 through the amplifying circuit.

Preferably, the device further comprises a key control module for driving the sound source selection module to switch the input signal, and the DSP control processing module is connected with the key control module.

Preferably, the power amplifier module includes power amplifier power supply subassembly and power amplifier subassembly, power amplifier power supply subassembly includes rectifier circuit, buffer circuit and vary voltage circuit, power amplifier subassembly includes preceding stage amplifier circuit, audio amplifier U7 and output circuit, rectifier circuit's output is connected with vary voltage circuit's input through buffer circuit, vary voltage circuit's output is connected with audio amplifier U7's power end VDD, preceding stage amplifier circuit's input is connected with DSP control processing module's output, preceding stage amplifier circuit's output is connected with audio amplifier U7's input IN, audio amplifier U7's output passes through output circuit and is connected with the speaker.

Compared with the prior art, the beneficial effects of the utility model reside in that: through sound source selection module extension BGM interface, VCD interface and DVD interface to make BGM signal, VCD signal and DVD signal all be connected with digital power amplifier through sound source selection module, digital power amplifier increases its audio signal's of inserting type through sound source selection module promptly, and then solves digital power amplifier interface quantity and type at present too few, leads to the audio frequency type that digital power amplifier can play to receive the problem of restriction, improves user's use and experiences.

Drawings

Fig. 1 is a circuit diagram of the sound source selection module according to the present invention.

Fig. 2 is a circuit diagram of the DSP control processing module according to the present invention.

Fig. 3 is an enlarged schematic view of the area a in fig. 2.

Fig. 4 is an enlarged schematic view of a region B in fig. 2.

Fig. 5 is an enlarged schematic view of the region C in fig. 2.

Fig. 6 is an enlarged schematic view of a region D in fig. 2.

Fig. 7 is a circuit diagram of an amplifying circuit according to the present invention.

Fig. 8 is a circuit diagram of the key control module according to the present invention.

Fig. 9 is a circuit diagram of the power amplifier power supply module according to the present invention.

Fig. 10 is a circuit diagram of the power amplifier amplifying module according to the present invention.

Fig. 11 is a schematic diagram of the practical application of the DSP digital power amplifier based on the multi-channel sound source of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention will be further described with reference to the accompanying drawings and specific embodiments:

as shown IN fig. 1-11, a DSP digital power amplifier based on multi-channel sound source comprises a power amplifier module, a DSP control processing module and a sound source selection module, wherein the sound source selection module comprises a BGM interface for obtaining a BGM signal, a DVD interface for obtaining a DVD signal, a VCD interface for obtaining a VCD signal, and an analog electronic switch U17 for switching input signals, as shown IN fig. 1, the analog electronic switch U17 is an NJM2753 low noise, low distortion stereo 3-to-1 analog electronic switch for ensuring high fidelity sound transmission to a lower circuit, an output end of the BGM interface is connected to a first input end IN1 of an analog electronic switch U17, an output end of the DVD interface is connected to a second input end IN2 of the analog electronic switch U17, an output end of the VCD interface is connected to a third input end IN3 of the analog electronic switch U17, an output end of the analog electronic switch U17 is connected to an input end of the DSP control processing module, the output end of the DSP control processing module is connected with the input end of the power amplifier module, and the output end of the power amplifier module is externally connected with a loudspeaker. Specifically, a BGM signal enters the analog electronic switch U17 from the first input terminal IN1A/IN1B, a DVD signal enters the analog electronic switch U17 from the second input terminal IN2A/IN2B, and a VCD signal enters the analog electronic switch U17 from the third input terminal IN3A/IN3B, so as to input three channels of audio to the audio source selection module, so that the audio source selection module is used to satisfy the requirement that a digital power amplifier can access various types of audio signals through the type of an extended interface, and meanwhile, a control switch terminal and an output terminal of the analog electronic switch U17 are both connected with the DSP control processing module.

Preferably, the DSP control processing module includes an analog component for acquiring an analog signal, an optical fiber component for acquiring an optical fiber signal, a coaxial component for acquiring a microphone signal, a digital component for acquiring a digital signal, a bluetooth component for acquiring a bluetooth signal, and a DSP control processor U2 for switching an input signal and modulating an audio sound effect, as shown in fig. 2 to 6, the analog component, the optical fiber component, the coaxial component, the digital component, and the bluetooth component are all connected to an input terminal of the DSP control processor U2, and an output terminal of the DSP control processor U2 is connected to an input terminal of the power amplifier module. Specifically, the DSP control processor U2 adopts an ADI DSP processor, wherein the bluetooth module includes an antenna and an antenna base J7, the antenna is plugged into an antenna base J7, the antenna base J7 is connected to an input RFI0 of the DSP control processor U2, the AUX LINE is connected to an input LINE1 of the DSP control processor U2 through an analog module, the microphone is connected to an input MIC1_ IN of the DSP control processor U2 through a coaxial module, preferably, the coaxial module includes an amplifying circuit (as shown IN fig. 7) and a microphone interface for externally connecting the microphone, the microphone interface is connected to an input MIC1_ IN of the DSP control processor U2 through the amplifying circuit, the digital module includes a USB digital interface, digital signals are input to the DSP control processor U2 through an optical fiber (OPT) and a Coaxial (COA), and the DSP control processor module further expands a plurality of interfaces or external signal source-connected components, the type of the audio signal that digital power amplifier can insert is increased to the greatest extent, the demand of the increasing digital sound source interface of the current user is fully met, and the good sensibility of the use experience of the user is provided.

And the DSP control processing module is connected with the key control module. In this embodiment, the key control module is provided with keys and knobs corresponding to various types of audio signal interfaces or components accessing the audio source, and the DSP control processor U2 determines states of the keys and the knobs through AD sampling, as shown in fig. 8, the BGM, the DVD, and the VCD are respectively used to switch audio channels to a BGM channel, a DVD channel, and a VCD channel. The USB/BL key is switched to the USB flash disk channel by short pressing and is switched to the Bluetooth channel by long pressing. The PREV key is switched to the previous song, the PLAY key is played and paused, the NEXT key is switched to the NEXT song, and the MENU key is returned to the main MENU page of the LCD screen.

Preferably, the power amplifier module includes power amplifier power supply subassembly and power amplifier subassembly, as shown IN fig. 9, power amplifier power supply subassembly includes rectifier circuit, buffer circuit and transformer circuit, as shown IN fig. 10, power amplifier subassembly includes preceding stage amplifier circuit, audio amplifier U7 and output circuit, rectifier circuit's output is connected with transformer circuit's input through buffer circuit, transformer circuit's output is connected with the VDD of audio amplifier U7 power end, preceding stage amplifier circuit's input is connected with DSP control processing module's output, preceding stage amplifier circuit's output is connected with audio amplifier U7's input IN, audio amplifier U7's output passes through output circuit and is connected with the speaker. In this embodiment, a power amplifier power supply module and a power amplifier amplification module are integrated, a power supply signal converts an alternating current signal into a direct current signal through a rectifier bridge D8(KBU808-8A), the direct current signal is voltage-isolated and current-limited through a ballast driver U3(IR2156SPBF), the direct current signal is converted into a direct current of ± 80V through a T1 coil, the audio amplifier U7(IRs20957S) is powered, an audio signal output by the DSP control processing module is amplified and filtered through a pre-stage amplification circuit composed of an amplifier U11B and peripheral components thereof, and then is input into an audio amplifier U7(IRs209 20957S) for amplification, and then is output to a speaker through an output circuit from an output end thereof for playing.

Furthermore, a voltage limit module for protecting the digital power amplifier and a display module for displaying menu display of various functions and machine working state are also arranged, in the embodiment, the voltage limit module consisting of the LM13700 mutual conductance operational amplifier prevents overlarge input signals from exceeding rated output power and burning out the digital power amplifier and a loudspeaker, and meanwhile, the display module consists of a 128 x 64LCD and a peripheral driving circuit so as to clearly display the function menu and the machine working state.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. The utility model provides a DSP digital power amplifier based on multichannel sound source which characterized in that: the audio source selection module comprises a BGM interface for acquiring a BGM signal, a DVD interface for acquiring a DVD signal, a VCD interface for acquiring a VCD signal and an analog electronic switch U17 for switching an input signal, wherein the output end of the BGM interface is connected with a first input end IN1 of an analog electronic switch U17, the output end of the DVD interface is connected with a second input end IN2 of the analog electronic switch U17, the output end of the VCD interface is connected with a third input end IN3 of the analog electronic switch U17, the output end OUT of the analog electronic switch U17 is connected with the input end of the DSP control processing module, the output end of the DSP control processing module is connected with the input end of the power amplification module, and the output end of the power amplification module is externally connected with a loudspeaker.

2. The multi-channel audio source based DSP digital power amplifier of claim 1, characterized in that: DSP control processing module is including the analog component that is used for acquireing analog signal, the optic fibre subassembly that is used for acquireing optical signal, the coaxial assembly that is used for acquireing microphone signal, the digital assembly that is used for acquireing digital signal, the DSP control treater U2 that is used for acquireing bluetooth signal's bluetooth subassembly and is used for switching input signal and modulation audio frequency audio, analog component, optic fibre subassembly, coaxial assembly, digital assembly and bluetooth subassembly all are connected with DSP control treater U2's input, DSP control treater U2's output is connected with the input of power amplifier module.

3. The multi-channel audio source based DSP digital power amplifier of claim 2, wherein: the coaxial assembly comprises an amplifying circuit and a microphone interface for externally connecting a microphone, and the microphone interface is connected with an input end MIC1_ IN of a DSP control processor U2 through the amplifying circuit.

4. The multi-channel audio source based DSP digital power amplifier of claim 1, characterized in that: the device also comprises a key control module for driving the sound source selection module to switch input signals, and the DSP control processing module is connected with the key control module.

5. The multi-channel audio source based DSP digital power amplifier of claim 1, characterized in that: the power amplifier module includes power amplifier power supply subassembly and power amplifier amplification subassembly, power amplifier power supply subassembly includes rectifier circuit, buffer circuit and voltage transformation circuit, power amplifier amplification subassembly includes preceding stage amplifier circuit, audio amplifier U7 and output circuit, rectifier circuit's output is passed through buffer circuit and is connected with voltage transformation circuit's input, voltage transformation circuit's output is connected with audio amplifier U7's power end VDD, preceding stage amplifier circuit's input is connected with DSP control processing module's output, preceding stage amplifier circuit's output is connected with audio amplifier U7's input IN, audio amplifier U7's output passes through output circuit and is connected with the speaker.