CN215818588U - Audio processing module and sound system - Google Patents
Audio processing module and sound system Download PDFInfo
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- CN215818588U CN215818588U CN202121124095.XU CN202121124095U CN215818588U CN 215818588 U CN215818588 U CN 215818588U CN 202121124095 U CN202121124095 U CN 202121124095U CN 215818588 U CN215818588 U CN 215818588U
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Abstract
The application provides an audio frequency processing module and sound system, audio frequency processing module includes: the system chip is used for outputting a digital audio signal; the digital-to-analog converter is electrically connected with the system chip and is used for converting the digital audio signals into analog audio signals of a left channel and analog audio signals of a right channel and transmitting the analog audio signals to external sound equipment; the frequency divider is electrically connected with the digital-to-analog converter and is used for separating the analog audio signal of the left channel and the analog audio signal of the right channel into a low-frequency analog audio signal and two high-frequency analog audio signals; and the power amplifier is electrically connected with the frequency divider and used for amplifying the low-frequency analog audio signal to drive the woofer to sound and amplifying the high-frequency analog audio signal to drive the tweeter to sound. The method and the device solve the problem that the existing analog audio output mode cannot meet the requirement of analog audio output in a 2.1 sound channel sound system.
Description
Technical Field
The application relates to the technical field of audio processing, in particular to an audio processing module and a sound system.
Background
The system chips of a plurality of existing televisions and displays only have one path of digital audio output, the requirement of a product on analog audio output cannot be met, when the product needs analog audio output, a frequently-adopted mode is that a digital audio signal is converted into an analog audio signal and then transmitted to external sound equipment, and in addition, the analog audio signal can be transmitted to an external sound box to improve the sound effect. In the prior art, an analog audio signal is transmitted to a circuit of an external sound box, a frequency division processor is built in a power amplifier, the analog audio output mode can meet the requirement of analog audio output in a 2.0 sound channel sound system, and because the 2.1 sound channel sound box has one path of subwoofer audio compared with the 2.0 sound channel sound box, the existing analog audio output mode cannot meet the requirement of analog audio output in the 2.1 sound channel sound system.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an audio processing module and a sound system, and solves the problem that the existing analog audio output mode cannot meet the requirement of analog audio output in a 2.1 sound channel sound system.
In a first aspect, an audio processing module is provided, including: a system chip for outputting a digital audio signal;
the digital-to-analog converter is electrically connected with the system chip and is used for converting the digital audio signals into analog audio signals of a left channel and analog audio signals of a right channel and transmitting the analog audio signals to external sound equipment;
the frequency divider is electrically connected with the digital-to-analog converter and is used for separating the analog audio signal of the left channel and the analog audio signal of the right channel into a low-frequency analog audio signal and two high-frequency analog audio signals;
and the power amplifier is electrically connected with the frequency divider and used for amplifying the low-frequency analog audio signal to drive the woofer to sound and amplifying the high-frequency analog audio signal to drive the tweeter to sound.
According to the audio processing module provided by the embodiment of the application, the digital-to-analog converter is arranged to convert a digital audio signal into an analog audio signal and transmit the analog audio signal to external sound equipment, the requirement of a product on analog audio output is met, the frequency divider is arranged outside the power amplifier, and the analog audio signal is processed by the frequency divider and then enters the power amplifier for signal power amplification, so that the frequency divider can separate the analog audio signal into one low-frequency analog audio signal and two high-frequency analog audio signals, the design of 2.1 sound channels is met, and the output analog audio signal meets the requirement on analog audio output in a 2.1 sound channel sound system.
In one possible design, the frequency divider includes a low pass filter, a first high pass filter, and a second high pass filter;
the digital-to-analog converter combines the analog audio signal of the left channel and the analog audio signal of the right channel and transmits the combined signals to the low-pass filter;
the digital-to-analog converter transmits the analog audio signal of the left channel to the first high-pass filter;
and the digital-to-analog converter transmits the analog audio signal of the right channel to the second high-pass filter.
In one possible design, the low-pass filter has a first signal input and a first signal output;
the first signal input end is connected with a first resistor, the other end of the first resistor is connected with a first capacitor and the first signal output end, and the other end of the first capacitor is grounded.
In one possible design, the first high-pass filter and the second high-pass filter are both high-pass filters, the high-pass filters having a second signal input and a second signal output;
the second signal input end is connected with a second capacitor, the other end of the second capacitor is connected with a second resistor and the second signal output end, and the other end of the second resistor is grounded.
In one possible design, the digital-to-analog converter has an equalization regulator built in.
In one possible design, the digital-to-analog converter includes a left channel audio signal digital-to-analog converter and a right channel audio signal digital-to-analog converter.
In one possible design, the power amplifier includes a left channel low frequency signal power amplifier, a left channel high frequency signal power amplifier, a right channel low frequency signal power amplifier, and a right channel high frequency signal power amplifier.
In one possible embodiment, the digital-to-analog converter combines the analog audio signal of the left channel and the analog audio signal of the right channel to be supplied to the external audio device.
In a second aspect, there is provided a sound system comprising:
the audio processing module is as described above;
the external sound equipment is electrically connected with the digital-to-analog converter;
a woofer electrically connected with the power amplifier;
two high pitch loudspeaker, two high pitch loudspeaker all with power amplifier electricity is connected.
In one possible design, the sound system further includes a voice recognition module electrically connected to the audio processing module for recognizing the voice command signal to start processing the digital audio signal.
The utility model has the following beneficial effects: the digital audio signals are converted into the analog audio signals through the digital-to-analog converter, the requirement of a product on analog audio output can be met, the setting position of the frequency divider is transferred to the outside of the power amplifier from the inside of the power amplifier, the audio signals can be processed into one low-frequency signal and two high-frequency signals through the frequency divider, and then the low-frequency signal and the two high-frequency signals can be input into the power amplifier for power amplification, so that the design of 2.1 sound channels is met, and the requirement on analog audio output in a 2.1 sound channel sound system can be met.
Drawings
Fig. 1 is a block diagram of an audio processing module according to an embodiment of the present disclosure.
Fig. 2 is a circuit model of the low pass filter of fig. 1.
Fig. 3 is a circuit model of the first high-pass filter and the second high-pass filter of fig. 1.
Fig. 4 is a schematic diagram illustrating the adjustment of an equalizer and a frequency divider when an analog audio signal is output by an audio processing module according to an embodiment of the present disclosure.
Reference numerals: 10. a system chip; 20. a digital-to-analog converter; 30. a balance adjuster; 50. a frequency divider; 51. a low-pass filter; 52. a first high-pass filter; 53. a second high pass filter; 60. a power amplifier; 100. an external sound device; 71. a woofer; 72. a high pitch loudspeaker.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the same reference numerals are used to denote the same components or parts in the embodiments of the present application, and for the same parts in the embodiments of the present application, only one of the parts or parts may be given the reference numeral, and it should be understood that the reference numerals are also applicable to the other same parts or parts.
The embodiment of the application provides an audio processing module and a sound system, and solves the problem that the existing analog audio output mode cannot meet the requirement of analog audio output in a 2.1 sound channel sound system.
As shown in fig. 1, an audio processing module provided in the embodiment of the present application includes a system chip 10, where the system chip 10 is configured to output a digital audio signal; the digital-to-analog converter 20, the digital-to-analog converter 20 is electrically connected to the system chip 10, and is configured to convert the digital audio signal into an analog audio signal of a left channel and an analog audio signal of a right channel and transmit the analog audio signals to the external sound device 100; the frequency divider 50 is electrically connected with the digital-to-analog converter 20 and is used for separating the analog audio signal of the left channel and the analog audio signal of the right channel into a low-frequency analog audio signal and two high-frequency analog audio signals; and the power amplifier 60 is electrically connected with the frequency divider 50 and is used for amplifying the low-frequency analog audio signal to drive the woofer 71 to generate sound and amplifying the high-frequency analog audio signal to drive the tweeter 72 to generate sound.
According to the audio processing module provided by the embodiment of the application, the digital-to-analog converter 20 is arranged to convert a digital audio signal into an analog audio signal and transmit the analog audio signal to external sound equipment, so that the requirement of a product on analog audio output is met, the frequency divider 50 is arranged outside the power amplifier 60, and the audio signal is processed by the frequency divider 50 and then enters the power amplifier 60 to be subjected to signal power amplification, so that the analog audio signal is separated into one low-frequency analog audio signal and two high-frequency analog audio signals by the frequency divider, the design of 2.1 channels is met, and the output analog audio signal meets the requirement of the 2.1-channel sound system on analog audio output.
In addition, "2" of the 2.1 channels means a standard two-channel (stereo); ". 1" refers to a "bass" channel that is a single divided output, typically below about 100 Hz. 2.1 the audio amplifier possess two independent power amplifier modules, one is responsible for the module of satellite audio amplifier for the stereo, and one is responsible for the module of bass audio amplifier specially for the heavy bass, and the stereo module is independent left (L), right (R) sound channel power amplifier piece, and the heavy bass is the slightly power amplifier piece that slightly is bigger after the sound channel jointly filters about for.
As shown in fig. 1, the frequency divider 50 includes a low-pass filter 51, a first high-pass filter 52, and a second high-pass filter 53; the digital-to-analog converter 20 combines the analog audio signal of the left channel and the analog audio signal of the right channel and supplies the combined signals to the low-pass filter 51; the digital-to-analog converter 20 supplies the analog audio signal of the left channel to the first high-pass filter 52; the digital-to-analog converter 20 supplies the analog audio signal of the right channel to a second high-pass filter 53. The digital-to-analog converter 20 combines the analog audio signal of the left channel and the analog audio signal of the right channel and supplies the combined signals to the external audio device 100.
With the above arrangement, the digital-to-analog converter 20 outputs the analog audio signal of the left channel and the analog audio signal of the right channel, and separately transmits the audio signals to four different directions, and first, combines the analog audio signal of the left channel and the analog audio signal of the right channel and transmits the combined signals to the external audio device 100 to control the external audio device 100 to operate; secondly, the analog audio signal of the left channel and the analog audio signal of the right channel are combined and transmitted to the low-pass filter 51, so that unnecessary high-frequency signals in the analog audio signals can be filtered; third, the analog audio signal of the left channel is fed to the first high-pass filter 52, so that the undesired low-frequency signal in the analog audio signal of the left channel can be filtered; fourth, the analog audio signal of the right channel is supplied to the second high-pass filter 53, so that unnecessary high-frequency signals in the analog audio signal of the right channel can be filtered out.
As shown in fig. 2, which is a circuit model of the low-pass filter 51, the low-pass filter 51 has a first signal input terminal and a first signal output terminal; the first signal input end is connected with a first resistor, the other end of the first resistor is connected with a first capacitor and a first signal output end, and the other end of the first capacitor is grounded. According to the circuit of fig. 2, the cutoff frequency of the low-pass filter 51 is calculated as f 1/(2 pi RC); as shown in fig. 3, which is a circuit model of the first high pass filter 52 and the second high pass filter 53, the first high pass filter 52 and the second high pass filter 53 are both high pass filters, and the high pass filters have a second signal input terminal and a second signal output terminal; the second signal input end is connected with a second capacitor, the other end of the second capacitor is connected with a second resistor and a second signal output end, and the other end of the second resistor is grounded. According to the circuit of fig. 3, the cutoff frequency calculation formula of the first high pass filter 52 and the second high pass filter 53 is 1/(2 pi RC).
In the embodiment of the present application, divide into the multichannel with the analog audio signal of digital-to-analog converter 20 output and carry and can make the sound production route more than one, carry the analog audio signal of left channel and the analog audio signal of right channel to merge and carry simulation audio output interface 40 and can drive the work of external sound equipment 100 sound production, and carry analog audio signal and then can increase the transmission route of analog audio signal in frequency divider 50, and then can increase the number of the sound production components and parts of analog audio signal drive, for example can connect outside earphone in the work of external sound equipment sound production, come the sound production through outside earphone, make the range of application and the application scene of this application embodiment more extensive like this, the function is abundanter.
As shown in fig. 1, the digital-to-analog converter 20 has an equalization regulator 30 built therein.
Through the above arrangement, the digital-to-analog converter 20 is internally provided with the balance adjuster 30, the balance adjuster 30 plays roles of low cut (cutting off the frequency which cannot be supported before the horn Fb), high cut (cutting off the frequency which cannot be supported by the high frequency of the horn), and horn frequency response adjustment (pulling up the attenuation frequency of the horn, and pressing down the too high frequency of the horn to make the frequency response curve of the whole sound pressure as flat as possible), and the analog audio signal is processed by the balance adjuster 30, so that the analog audio signal input to the power amplifier 60 is an accurate and high-quality signal.
Optionally, the digital-to-analog converter 20 includes a left channel audio signal digital-to-analog converter 20 and a right channel audio signal digital-to-analog converter 20.
With the above arrangement, the left-channel audio signal digital-to-analog converter 20 converts a digital audio signal into a left-channel analog audio signal, and the right-channel audio signal digital-to-analog converter 20 converts a digital audio signal into a right-channel analog audio signal, so that the digital-to-analog converter 20 can output a two-channel analog audio signal.
Optionally, the power amplifier 60 includes a left channel low frequency signal power amplifier, a left channel high frequency signal power amplifier, a right channel low frequency signal power amplifier, and a right channel high frequency signal power amplifier.
With the above arrangement, the left channel low-frequency signal power amplifier is used for amplifying the left channel analog audio signal filtered by the low-pass filter 51, and the right channel low-frequency signal power amplifier is used for amplifying the right channel analog audio signal filtered by the low-pass filter 51; the left channel high frequency signal power amplifier is used for amplifying the left channel analog audio signal filtered by the first high pass filter 52; the right channel high frequency signal power amplifier is used to amplify the right channel analog audio signal filtered by the second high pass filter 53.
The sound system provided by the embodiment of the application comprises the audio processing module; an external acoustic device 100 electrically connected to the digital-to-analog converter 20; a woofer 71, the woofer 71 being electrically connected to the power amplifier 60; two tweeters 72, both tweeters 72 being electrically connected to the power amplifier 60.
According to the sound system that this application embodiment provided, the amplified analog audio signal of left channel low frequency signal power amplifier and right channel low frequency signal power amplifier can drive woofer 71 pronunciation, the amplified analog audio signal of left channel high frequency signal power amplifier and right channel high frequency signal power amplifier can drive two tweeters 72 vocalizations respectively, and digital-to-analog converter 20 can drive outside sound equipment 100 phonation work with the analog audio signal of left channel and the analog audio signal of right channel and transmission to outside sound equipment 100, can make sound system possess abundant sound production mode like this, it is more convenient to use, the sound production effect is also better.
Optionally, the sound system provided in the embodiment of the present application further includes a voice recognition module, where the voice recognition module is electrically connected to the audio processing module, and is configured to recognize a voice instruction signal to start processing the digital audio signal. Realize speech recognition control through setting up speech recognition module, pronunciation can control audio processing module and handle digital audio signal, make the more intelligent of sound system of this application embodiment, but people of any age bracket all simple operation.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An audio processing module, comprising:
a system-on-chip (10), the system-on-chip (10) for outputting a digital audio signal;
the digital-to-analog converter (20), the digital-to-analog converter (20) is electrically connected with the system chip (10), and is used for converting the digital audio signal into an analog audio signal of a left channel and an analog audio signal of a right channel and transmitting the analog audio signals to an external sound device (100);
the frequency divider (50) is electrically connected with the digital-to-analog converter (20) and is used for separating the analog audio signal of the left channel and the analog audio signal of the right channel into a low-frequency analog audio signal and two high-frequency analog audio signals;
a power amplifier (60), the power amplifier (60) being electrically connected with the frequency divider (50) and used for amplifying the low-frequency analog audio signal to drive a bass loudspeaker (71) to generate sound and amplifying the high-frequency analog audio signal to drive a treble loudspeaker (72) to generate sound.
2. Audio processing module according to claim 1, characterized in that the frequency divider (50) comprises a low-pass filter (51), a first high-pass filter (52) and a second high-pass filter (53);
the digital-to-analog converter (20) combines the analog audio signal of the left channel and the analog audio signal of the right channel and transmits the combined signals to the low-pass filter (51);
-said digital-to-analog converter (20) delivering an analog audio signal of said left channel to said first high-pass filter (52);
the digital-to-analog converter (20) supplies the analog audio signal of the right channel to the second high-pass filter (53).
3. Audio processing module according to claim 2, characterized in that the low-pass filter (51) has a first signal input and a first signal output;
the first signal input end is connected with a first resistor, the other end of the first resistor is connected with a first capacitor and the first signal output end, and the other end of the first capacitor is grounded.
4. Audio processing module according to claim 3, characterized in that the first high-pass filter (52) and the second high-pass filter (53) are both high-pass filters having a second signal input and a second signal output;
the second signal input end is connected with a second capacitor, the other end of the second capacitor is connected with a second resistor and the second signal output end, and the other end of the second resistor is grounded.
5. Audio processing module according to one of claims 1 to 4, characterized in that the digital-to-analog converter (20) has an equalization regulator (30) built in.
6. Audio processing module according to claim 5, characterized in that the digital-to-analog converter (20) comprises a left channel audio signal digital-to-analog converter and a right channel audio signal digital-to-analog converter.
7. Audio processing module according to claim 5, characterized in that the power amplifier (60) comprises a left channel low frequency signal power amplifier, a left channel high frequency signal power amplifier, a right channel low frequency signal power amplifier and a right channel high frequency signal power amplifier.
8. The audio processing module of claim 1, wherein the digital-to-analog converter (20) combines the analog audio signal of the left channel and the analog audio signal of the right channel for delivery to the external sound device (100).
9. An audio sound system, comprising:
the audio processing module of any of claims 1-8;
an external sound device (100) electrically connected to the digital-to-analog converter (20);
a woofer (71), the woofer (71) being electrically connected with the power amplifier (60);
two tweeters (72), both tweeters (72) being electrically connected to the power amplifier (60).
10. The sound system as set forth in claim 9 further comprising a voice recognition module electrically connected to said audio processing module for recognizing a voice command signal to begin processing the digital audio signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121124095.XU CN215818588U (en) | 2021-05-24 | 2021-05-24 | Audio processing module and sound system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121124095.XU CN215818588U (en) | 2021-05-24 | 2021-05-24 | Audio processing module and sound system |
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| CN215818588U true CN215818588U (en) | 2022-02-11 |
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| CN202121124095.XU Active CN215818588U (en) | 2021-05-24 | 2021-05-24 | Audio processing module and sound system |
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