CN111988706B - Audio playing device and method - Google Patents
Audio playing device and method Download PDFInfo
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- CN111988706B CN111988706B CN201910433849.0A CN201910433849A CN111988706B CN 111988706 B CN111988706 B CN 111988706B CN 201910433849 A CN201910433849 A CN 201910433849A CN 111988706 B CN111988706 B CN 111988706B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
Abstract
An audio playing device and an audio playing method are provided, the audio playing device includes: a plurality of signal processing paths connected in parallel, an adder, and an amplifier module. The number of the signal processing paths is N, and the signal processing paths are respectively configured to receive the same input signals so as to generate output analog signals through signal processing, wherein the signal processing paths respectively at least comprise digital-to-analog conversion modules, and the signal processing at least comprises digital-to-analog conversion corresponding to the digital-to-analog conversion modules. The adder is configured to sum the output analog signals generated by the signal processing paths to generate a total output analog signal. The amplifier module is configured to receive the total output analog signal, and adjust a signal strength of the total output analog signal by a gain to generate the output audio, wherein the gain is 1/N.
Description
Technical Field
The present invention relates to audio playing technologies, and in particular, to an audio playing apparatus and method.
Background
In recent years, users of electronic products are increasingly pursuing high-quality music listening, so that the specifications of components for playing music must be increased accordingly. In the current audio playing technology, signal processing is performed on digital audio, for example, digital-to-analog conversion is performed to convert the audio into an analog form, and then the audio is played through an earphone or a speaker. However, in the signal processing process, the noise generated by the circuit responsible for signal processing is also transmitted to the earphone or speaker along with the audio, which has a considerable influence on the sound quality.
Therefore, it is an urgent need in the art to design a new audio playing device and method to solve the above-mentioned deficiencies.
Disclosure of Invention
The invention aims to provide an audio playing device, which comprises: a plurality of signal processing paths connected in parallel, an adder, and an amplifier module. The number of the signal processing paths is N, and the signal processing paths are respectively configured to receive the same input signals so as to generate output analog signals through signal processing, wherein the signal processing paths respectively at least comprise digital-to-analog conversion modules, and the signal processing at least comprises digital-to-analog conversion corresponding to the digital-to-analog conversion modules. The adder is configured to sum the output analog signals generated by the signal processing paths to generate a total output analog signal. The amplifier module is configured to receive the total output analog signal, and adjust a signal strength of the total output analog signal by a gain to generate the output audio, wherein the gain is 1/N.
Another object of the present invention is to provide an audio playing method, comprising: enabling a plurality of signal processing paths which are connected in parallel and have the number N to respectively receive the same input signal so as to generate an output analog signal through signal processing, wherein the signal processing paths respectively at least comprise a digital-to-analog conversion module, and the signal processing at least comprises digital-to-analog conversion corresponding to the digital-to-analog conversion module; adding the output analog signals generated by each signal processing path by an adder to generate a total output analog signal; and enabling an amplifier module to receive the total output analog signal, so as to adjust the signal intensity of the total output analog signal by a gain to generate an output audio frequency, wherein the gain is 1/N.
The invention has the advantages that the audio playing device and the audio playing method receive the same input signals for processing by connecting the signal processing paths arranged in front of the amplifier module in parallel, and the signals are added by the adder and then are adjusted by the amplifier module by gain, thereby achieving the purpose of reducing the output noise generated by the signal processing paths.
Drawings
Fig. 1 is a block diagram of an audio playback device according to an embodiment of the present invention;
FIG. 2 is a block diagram of an audio playback device according to an embodiment of the present invention;
FIG. 3 is a block diagram of an audio playback device according to an embodiment of the present invention;
FIG. 4 is a block diagram of an audio playback device according to an embodiment of the present invention; and
fig. 5 is a flowchart of an audio playing method according to an embodiment of the present invention.
Description of the symbols
1. 2, 3, 4: the audio playback apparatus 100: signal processing path
102: adder 104: amplifier module
106: digital-to-analog conversion module 300: preceding stage module
400: digital modulation module Vauo: outputting audio
Vin: input signal Vout: outputting analog signals
Vto: total output analog signal 500: audio playing method
501-503: step (ii) of
Detailed Description
Please refer to fig. 1. Fig. 1 is a block diagram of an audio playback device 1 according to an embodiment of the present invention. In various embodiments, the audio playing device 1 may be an earphone or an audio speaker. The audio playback apparatus 1 includes: a plurality of signal processing paths 100 in parallel, a summer 102, and an amplifier module 104.
The number of signal processing paths 100 is N, which is 2 in this embodiment. The signal processing paths 100 are respectively configured to receive the same input signal Vin to generate an output analog signal Vout through signal processing.
In the present embodiment, each signal processing path 100 includes a digital-to-analog conversion module 106. Therefore, the signal processing performed by the signal processing path 100 includes digital-to-analog conversion corresponding to the digital-to-analog conversion module 106 to convert the input signal Vin from a digital form into an analog form of the output analog signal Vout.
The adder 102 is configured to sum the output analog signals Vout generated by the respective signal processing paths 100 to generate a total output analog signal Vto.
The amplifier module 104 is configured to receive the total output analog signal Vto, so as to adjust the signal strength of the total output analog signal Vto by a gain to generate the output audio Vauo, wherein the gain is 1/N. Therefore, the signal strength of the output audio Vauo will be practically the same as the input signal Vin.
As previously described, since N is 2 in this embodiment, the gain will be 1/2.
In one embodiment, the digital-to-analog conversion module 106 is configured to make the output analog signal Vout have output noise. In one embodiment, the output noise is denoted as Vn, dac. This output noise Vn, dac will be reflected in the output audio Vauo via the processing of the adder 102 and the amplifier module 104. In one embodiment, after the gain adjustment by the amplifier module 104, the output noise of the dac module 106 corresponding to each signal processing path 100 is Vn, dac/N.
Further, the power of the output noise output by the amplifier module 104 is (V)n,dac/N)2And the sum of the power of N such output noises will be N × (V)n,dac/N)2. Thus, the total output noise actually output at the output audio Vauo by the amplifier module 104 will be of a magnitude
The total output noise will be the output noise corresponding to the digital-to-analog conversion module 106
And (4) doubling.
As previously described, since N is 2 in this embodiment, the total output noise will be that of the output noise
And (4) doubling. The audio playing device 1 of the present invention can receive the same input signal Vin by connecting the signal processing paths 100 in parallel before the amplifier module 104, and then adjust the input signal Vin by the amplifier module 104 after summing the input signal Vin by the adder 102, so as to achieve the purpose of reducing the output noise generated by the signal processing paths 100.
Please refer to fig. 2. Fig. 2 is a block diagram of an audio playback device 2 according to an embodiment of the present invention. The audio playback apparatus 2 includes: a plurality of signal processing paths 100 in parallel, a summer 102, and an amplifier module 104. The signal processing paths 100 respectively include digital-to-analog conversion modules 106.
The structures and functions of the signal processing path 100, the adder 102 and the amplifier module 104 are different from those of the signal processing path 100, the adder 102 and the amplifier module 104 shown in fig. 1, and therefore, the description of the same parts is omitted. In the present embodiment, the number of the signal processing paths 100 is 4. Therefore, the total output noise of the output audio Vauo output will be the output noise of the output analog signal Vout
And (4) doubling.
Therefore, as the number N of signal processing paths 100 is larger, it will have a better effect on the suppression of noise. It should be noted, however, that the larger the number N of signal processing paths 100, the higher the installation cost and the area cost of the circuit. Therefore, in different embodiments, the audio playback apparatus 2 can set an appropriate number of signal processing paths 100 according to actual conditions, so as to balance the technical effects of noise suppression and circuit cost.
It should be noted that the above embodiments are described by taking N as 2 and N as 4 as examples. In other embodiments, the audio playing apparatus may also have other numbers of signal processing paths 100, which are not limited to the above embodiments.
Please refer to fig. 3. Fig. 3 is a block diagram of an audio playback device 3 according to an embodiment of the present invention. The audio playback apparatus 3 includes: a plurality of signal processing paths 100 in parallel, a summer 102, and an amplifier module 104.
The structures and functions of the adder 102 and the amplifier module 104 are different from those of the adder 102 and the amplifier module 104 shown in fig. 1, and therefore, the same parts are not described again.
In the present embodiment, each signal processing path 100 includes a pre-stage module 300 electrically coupled to the digital-to-analog conversion module 106, in addition to the digital-to-analog conversion module 106. Therefore, the signal processing performed by the signal processing path 100 includes signal amplification processing corresponding to the previous stage module 300 in addition to digital-to-analog conversion. More specifically, the signal processing path 100 performs digital-to-analog conversion on the input signal Vin, and then performs signal amplification, signal filtering, and the like to output the analog signal Vout. In one embodiment, the signal processing path 100 may include a plurality of pre-stage modules 300 connected in parallel to reduce noise.
In one embodiment, the amplifier module 104 is a post driver module or a post amplifier module. The front stage module 300 is a front stage driving module or a front stage amplifying module.
In one embodiment, when the signal processing path 100 includes the pre-stage module 300 and the signal is processed by the pre-stage module 300, the corresponding output noise is also generated. Therefore, by arranging the signal processing path 100 including the digital-to-analog conversion module 106 and the front-stage module 300 in parallel in a manner similar to that of the previous embodiment, the sum of the signal processing path 100 and the front-stage module is summed by the adder 102, and then the signal processing path is adjusted by the amplifier module 104 with a gain, so as to achieve the purpose of reducing the output noise generated by the signal processing path 100.
Please refer to fig. 4. Fig. 4 is a block diagram of an audio playback device 4 according to an embodiment of the present invention. The audio playback apparatus 4 includes: a plurality of signal processing paths 100 in parallel, a summer 102, and an amplifier module 104.
The structures and functions of the adder 102 and the amplifier module 104 are different from those of the adder 102 and the amplifier module 104 shown in fig. 1, and therefore, the same parts are not described again.
In the present embodiment, each signal processing path 100 includes a digital modulation module 400, which is electrically coupled to the digital-to-analog conversion module 106, in addition to the digital-to-analog conversion module 106. Therefore, the signal processing performed by the signal processing path 100 includes signal modulation processing corresponding to the digital modulation module 400 in addition to digital-to-analog conversion. More specifically, the signal processing path 100 performs digital-to-analog conversion after modulating the input signal Vin, and outputs the analog signal Vout.
In one embodiment, when the signal processing path 100 includes the digital modulation module 400 and the signal is processed by the digital modulation module 400, the corresponding output noise is also generated. Therefore, by arranging the signal processing paths 100 including the digital modulation module 400 and the digital-to-analog conversion module 106 in parallel in a manner similar to that of the previous embodiment, the sum of the sum is summed by the adder 102 and then adjusted by the gain of the amplifier module 104, so as to achieve the purpose of reducing the output noise generated by the signal processing paths 100.
It should be noted that fig. 3 and 4 are illustrated with N being 4. In other embodiments, the audio playing apparatus may also have other numbers of signal processing paths 100, which are not limited to the above embodiments.
Please refer to fig. 5. Fig. 5 is a flowchart of an audio playing method 500 according to an embodiment of the present invention. The audio playing method 500 can be applied to the audio playing apparatus 1 shown in fig. 1. The audio playing method 500 comprises the following steps (it should be understood that the steps mentioned in the present embodiment, except for the sequence specifically described, can be performed simultaneously or partially simultaneously according to the actual requirement.
In step 501, the signal processing paths 100 respectively receive the same input signals Vin to generate output analog signals Vout through signal processing, where the signal processing paths 100 respectively at least include the digital-to-analog conversion modules 106, and the signal processing at least includes digital-to-analog conversion corresponding to the digital-to-analog conversion modules 106.
In step 502, the adder 102 adds the output analog signals Vout generated by the signal processing paths 100 to generate a total output analog signal Vto.
In step 503, the amplifier module 104 receives the total output analog signal Vto, so as to adjust the signal strength of the total output analog signal Vto by a gain to generate the output audio Vauo, wherein the gain is 1/N.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An audio playback apparatus comprising:
a plurality of signal processing paths connected in parallel, the number of the signal processing paths being N, the signal processing paths being respectively configured to receive a same input signal to generate an output analog signal through a signal processing, the output analog signal respectively having an output noise, wherein the signal processing paths respectively at least comprise a digital-to-analog conversion module, and the signal processing at least comprises a digital-to-analog conversion corresponding to the digital-to-analog conversion module;
an adder configured to add the output analog signals generated by the signal processing paths to generate a total output analog signal; and
an amplifier module configured to receive the total output analog signal and adjust a signal strength of the total output analog signal by a gain to generate an output audio, wherein the gain is 1/N, so that a total output noise of the output audio generated by the amplifier module is the output noise
And (4) doubling.
2. The audio playback device of claim 1, wherein the signal processing paths further comprise a front-end module electrically coupled to the digital-to-analog conversion module, respectively, and the signal processing further comprises a signal amplification process corresponding to the front-end module.
3. The audio playing device of claim 2, wherein the amplifier module is a post-amplifier module or a post-driver module.
4. The audio player of claim 2, wherein the pre-stage module is a pre-stage amplifying module or a pre-stage driving module.
5. The audio playing device of claim 1, wherein the signal processing paths further respectively comprise a digital modulation module electrically coupled to the digital-to-analog conversion modules, and the signal processing further comprises signal modulation processing corresponding to the digital modulation module.
6. An audio playback method, comprising:
enabling a plurality of signal processing paths which are connected in parallel and have the number N to respectively receive the same input signal so as to generate an output analog signal through signal processing, wherein the output analog signal respectively has an output noise, the signal processing paths respectively at least comprise a digital-to-analog conversion module, and the signal processing at least comprises digital-to-analog conversion corresponding to the digital-to-analog conversion module;
adding the output analog signals generated by each signal processing path by an adder to generate a total output analog signal; and
an amplifier module receives the total output analog signal, so as to adjust the signal intensity of the total output analog signal by a gain to generate an output audio frequency, wherein the gain is 1/N, and total output noise of the output audio frequency generated by the amplifier module is the output noise
And (4) doubling.
7. The audio playing method of claim 6, wherein the signal processing paths further comprise at least one of a front-end module electrically coupled to the digital-to-analog conversion module and a digital modulation module electrically coupled to the front-end module, respectively, and the signal processing further comprises at least one of a signal amplification process corresponding to the front-end module and a signal modulation process corresponding to the digital modulation module.
8. The audio playing method of claim 7, wherein the front stage module is a front stage amplifying module or a front stage driving module, and the amplifier module is a rear stage amplifying module or a rear stage driving module.
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| CN201910433849.0A CN111988706B (en) | 2019-05-23 | 2019-05-23 | Audio playing device and method |
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| CN201910433849.0A CN111988706B (en) | 2019-05-23 | 2019-05-23 | Audio playing device and method |
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| US6919833B2 (en) * | 2003-09-04 | 2005-07-19 | Regan N. Mills | Parallel converter topology for reducing non-linearity errors |
| CN104954935B (en) * | 2014-03-26 | 2018-11-06 | 瑞昱半导体股份有限公司 | Audio device and its control method |
| US10056915B2 (en) * | 2015-07-16 | 2018-08-21 | Semiconductor Components Industries, Llc | Digital-to-analog converter |
| TWI601015B (en) * | 2016-05-25 | 2017-10-01 | 瑞昱半導體股份有限公司 | Data processing circuit and data processing method |
| CN106502623A (en) * | 2016-12-01 | 2017-03-15 | 北京小米移动软件有限公司 | Audio output device and method |
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