CN219658385U

CN219658385U - Audio playing equipment

Info

Publication number: CN219658385U
Application number: CN202223506168.9U
Authority: CN
Inventors: 田富春; 聂云辉; 何艳; 陈兴宝; 李万强; 余绍恒; 陈文熙; 周海浪
Original assignee: Guangzhou Changjia Electronic Co ltd
Current assignee: Guangzhou Changjia Electronic Co ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-09-08
Anticipated expiration: 2032-12-26

Abstract

The utility model discloses an audio playing device, which comprises: audio input, soC chip, audio decoding chip, bluetooth module, microphone, flash memory module, audio amplifier, demonstration keypad, woofer and tweeter, wherein: the audio input interface is connected with the SoC chip through an analog-to-digital converter, the audio input interface is connected with the Bluetooth module through a switch circuit, the Bluetooth module is connected with the SoC chip, the microphone is connected with the SoC chip, the display key board is connected with the SoC chip, the flash memory module is connected with the SoC chip, the SoC chip is connected with the audio decoding chip, and the signal output end of the audio decoding chip is connected with a woofer and a high-frequency loudspeaker through an audio amplifier. According to the utility model, the SoC chip and the audio decoding chip are matched, so that the high-quality sound effect output of the audio playing device is improved.

Description

Audio playing equipment

Technical Field

The utility model relates to the field of electronic circuits, in particular to audio playing equipment.

Background

The audio playing device is mainly a generic term for audio input and output devices, and the audio playing device includes: power amplifier, audio amplifier, multimedia console, digital sound console, audio sampling card, synthesizer, well high frequency audio amplifier, microphone, sound card in the PC, earphone etc. other peripheral audio playback devices: professional microphone series, earphone, sound receiving and amplifying system, etc. The tone quality in the audio playing device is an important standard for judging the quality of the audio playing device, wherein the important standard comprises indexes such as signal-to-noise ratio, sampling bit number, sampling frequency, total harmonic distortion and the like, and the tone quality of the audio playing device is determined by the parameters.

When the existing audio playing device does not use the SoC chip, the whole audio playing device cannot be compatible with a high-performance audio decoding chip, and the audio decoding chip supports a 3A algorithm, noise reduction, automatic gain, echo cancellation and the like, so that the audio playing device cannot be combined with the SoC chip to enjoy high-quality sound effects.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and provides audio playing equipment, which improves the high-quality sound effect output of the audio playing equipment through the matching of an SoC chip and an audio decoding chip.

The present utility model provides an audio playback apparatus including: audio input, soC chip, audio decoding chip, bluetooth module, microphone, flash memory module, audio amplifier, demonstration keypad, woofer and tweeter, wherein:

the audio input interface is connected with the SoC chip through an analog-to-digital converter, the audio input interface is connected with the Bluetooth module through a switch circuit, the Bluetooth module is connected with the SoC chip, the microphone is connected with the SoC chip, the display key board is connected with the SoC chip, the flash memory module is connected with the SoC chip, the SoC chip is connected with the audio decoding chip, and the signal output end of the audio decoding chip is connected with a woofer and a high-frequency loudspeaker through an audio amplifier.

The SoC chip is an MLC3740 processing chip.

The audio decoding chip is an AKM7755 coder-decoder.

The audio playing device further includes: a first digital-to-analog converter connected to the switching circuit.

And a second digital-to-analog converter is connected between the signal output end of the audio decoding chip and the woofer, and the second digital-to-analog converter is connected with the woofer through a first audio amplifier.

The signal output end of the second digital-to-analog converter is connected with a parametric amplifier.

And a third digital-to-analog converter is connected between the signal output end of the audio decoding chip and the high-frequency loudspeaker, and the third digital-to-analog converter is connected with the high-frequency loudspeaker through a second audio amplifier.

The number of tweeters is 2.

The signal output end of the third digital-analog converter is connected with a parametric amplifier.

In the utility model, the SoC chip and the audio decoding chip are matched, so that the high-quality audio output of the audio playing device is improved, the integrated DSP chip in the AKM7755 coder can finish a 3A algorithm, ANR (noise reduction), AGC (automatic gain) and AEC (echo cancellation), and the microphone mic input of single end and difference is supported, the input and the output of i2s of a digital interface are supported, and the MLC3740 processing chip and the AKM7755 coder are combined, so that the high-quality audio output of the audio playing device can be improved, the compatibility of hardware configuration is improved, and the quality requirement of a user on the audio playing device is improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of an audio playback apparatus in an embodiment of the present utility model;

fig. 2 is a schematic diagram of a key backlight circuit on a display key sheet in an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, fig. 1 shows a schematic circuit diagram of an audio playing device according to an embodiment of the present utility model, where the audio playing device includes: audio input, soC chip, audio decoding chip, bluetooth module, microphone, flash memory module, audio amplifier, demonstration keypad, woofer and tweeter, wherein:

The audio input port here adopts an AUX interface (auxliary) which is an audio input interface, and can input audio (a general earphone jack) of electronic audio devices including mp3, and can output music in these devices through the sound in the vehicle. The AUX interface can perform signal interaction with the SoC chip through the analog-to-digital converter, and can also perform signal interaction with the SoC chip through the switch circuit. The analog-to-digital converter may be a model C55361 ADC.

The SoC chip is an MLC3740 processing chip, the audio decoding chip is an AKM7755 codec, and the AKM7755 codec can integrate a DSP chip inside to complete a 3A algorithm, ANR (noise reduction), AGC (automatic gain), AEC (echo cancellation), and support microphone mic input of single end and differential, which simultaneously support input and output of i2s of a digital interface.

The Bluetooth module adopts a QCC3021 Bluetooth module and a 5.1 version dual-mode Bluetooth audio module, supports TWS to box connection, broadcast and other sound box connection, and is applied to Bluetooth sound boxes and Bluetooth headphones; QCC3021 supports SBC and AAC audio decoding formats, and QCC3031 supports SBC, AAC, APTX, APTX-HD audio decoding formats; the Bluetooth module and the SoC chip realize serial communication based on UART.

The microphone and the SoC chip communicate based on an I2C bus, the MLC3740 processing chip and the AKM7755 coder/decoder communicate based on the I2C bus, and the flash memory module and the SoC chip communicate based on an SPI data line or a UART data line.

The number of tweeters is 2, i.e. here a first tweeter, a second tweeter.

It should be noted that, the display key board is provided with a display screen or a touch key, the display screen may be a touch display screen, the touch display screen is provided with a plurality of function selection items, the display key board can facilitate a user to control the audio playing device, and fig. 2 shows a key backlight circuit schematic diagram on the display key board in the embodiment of the utility model.

The signal output end of the third digital-analog converter is connected with a parametric amplifier, and the parametric amplifier can adjust relevant audio parameters such as a woofer, a first high-frequency loudspeaker, a second high-frequency loudspeaker and the like.

In summary, in the embodiment of the utility model, the SoC chip and the audio decoding chip are matched, so that the high-quality audio output of the audio playing device is improved, the 3A algorithm can be finished by the AKM7755 codec internal integrated DSP chip, the ANR (noise reduction), the AGC (automatic gain) and the AEC (echo cancellation) are supported, the microphone mic input of single end and differential is supported, the input and output of i2s of the digital interface are supported at the same time, the MLC3740 processing chip and the AKM7755 codec are combined, the high-quality audio output of the audio playing device can be improved, the compatibility of hardware configuration is improved, and the quality requirement of a user on the audio playing device is improved.

While the foregoing has been described in some detail by way of illustration of the principles and embodiments of the utility model, specific examples have been set forth herein to provide a thorough understanding of the method and core concepts of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims

1. An audio playback device, the audio playback device comprising: audio input, soC chip, audio decoding chip, bluetooth module, microphone, flash memory module, audio amplifier, demonstration keypad, woofer and tweeter, wherein:

the audio input port is connected with the SoC chip through an analog-to-digital converter, the audio input port is connected with the Bluetooth module through a switch circuit, the Bluetooth module is connected with the SoC chip, the microphone is connected with the SoC chip, the display key board is connected with the SoC chip, the flash memory module is connected with the SoC chip, the SoC chip is connected with the audio decoding chip, and the signal output end of the audio decoding chip is connected with a woofer and a high-frequency loudspeaker through an audio amplifier.

2. The audio playback device of claim 1, wherein the SoC chip is an MLC3740 processing chip.

3. The audio playback device of claim 1, wherein the audio decoding chip is an AKM7755 codec.

4. The audio playback device of claim 1, wherein the audio playback device further comprises: a first digital-to-analog converter connected to the switching circuit.

5. The audio playback device of claim 1, wherein a second digital-to-analog converter is connected between the signal output of the audio decoding chip and the woofer, the second digital-to-analog converter being connected to the woofer through a first audio amplifier.

6. The audio playback device of claim 5, wherein the signal output of the second digital-to-analog converter is coupled to a parametric amplifier.

7. The audio playback device of claim 1, wherein a third digital-to-analog converter is connected between the signal output of the audio decoding chip and the tweeter, the third digital-to-analog converter being connected to the tweeter via a second audio amplifier.

8. The audio playback device of claim 7, wherein the number of tweeters is 2.

9. The audio playback device of claim 7, wherein the signal output of the third digital-to-analog converter is coupled to a parametric amplifier.