Audio playing circuit and method and terminal equipment
By introducing a phase adjustment module into the audio playback circuit, the problem of phase cancellation of the sound wave signal of dual speakers in mobile phones is solved, and the audio effect is improved.
Patent Information
- Application Number
- CN202411999686.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-04-15
AI Technical Summary
The sound wave signal of dual speakers in mobile phones may have phase cancellation, especially the low-frequency part, which will be severely offset, affecting the audio effect.
An audio playback circuit is designed, including a control module, a first sound generating module, a second sound generating module and a phase adjustment module. Through the phase adjustment module, the control module can adjust the phase to the same when the phases of the first and second channels are opposite, thereby alleviating phase cancellation.
It effectively alleviates the phase cancellation problem of the sound wave signal and improves the audio effect, especially the sound quality of the low-frequency part.
Smart Images
Figure CN119835576A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic circuits, and in particular to an audio playback circuit, method and terminal device. Background Art
[0002] With the development of the mobile phone industry, mobile phones with high-configuration hardware are increasingly chosen by people, and in terms of audio hardware, dual speakers have basically become standard.
[0003] During the development of dual speakers in mobile phones, the upper and lower speakers are located in different structural positions, and the diaphragms between the upper and lower speakers are often facing opposite directions. In addition, the transmission process of the circuit line will pass through multiple links including PCB and main board to small board, so the phase of the sound wave signals of the upper and lower speakers is very likely to be inverted, that is, the phase difference is 180°. At this time, due to the inversion, the sound wave signals from the upper and lower speakers of the mobile phone will be phase-cancelled, especially the low-frequency part will be severely offset, which will affect the audio effect of the mobile phone. Summary of the invention
[0004] The present application provides an audio playback circuit, method and terminal device, which can alleviate the problem of sound wave signal cancellation existing in the current terminal device, affecting the sound effect.
[0005] The present application provides an audio playback circuit, the audio playback circuit comprising a control module, a first sound module, a second sound module and a phase adjustment module, the control module is connected to the first sound module through the phase adjustment module, and the control module is also connected to the second sound module;
[0006] The control module is used to control the first sound-emitting module to emit a sound wave of a first channel through the phase adjustment module, and is used to control the second sound-emitting module to emit a sound wave of a second channel;
[0007] The phase adjustment module is used to adjust the phases of the sound waves in the first channel and the second channel to be the same according to the phase adjustment signal output by the control module when the phases of the sound waves in the first channel and the second channel are opposite.
[0008] In the audio playback circuit of some embodiments, the phase adjustment module includes a double-pole double-throw switch; the control module is provided with a control terminal, a first positive output terminal and a first negative output terminal; the first sounding module has a first positive input terminal and a first negative input terminal;
[0009] The double-pole double-throw switch is used to connect the first positive output terminal to the first positive input terminal, and the first negative output terminal to the first inverting input terminal according to the phase adjustment signal; or the double-pole double-throw switch is used to connect the first positive output terminal to the first inverting input terminal, and the first negative output terminal to the first positive input terminal according to the phase adjustment signal.
[0010] In the audio playback circuit of some embodiments, the control module is further provided with a second positive output terminal and a second negative output terminal; the second sounding module has a second positive input terminal and a second negative input terminal;
[0011] The second positive output terminal is connected to the second positive input terminal, and the second negative output terminal is connected to the second negative input terminal.
[0012] In the audio playback circuit of some embodiments, when the sound outlet of the first sound module and the sound outlet of the second sound module are oriented in the same direction, the double-pole double-throw switch is used to connect the first positive output terminal to the first positive input terminal and the first negative output terminal to the first negative input terminal according to a phase adjustment signal.
[0013] In the audio playback circuit of some embodiments, when the sound outlet of the first sound module and the sound outlet of the second sound module are facing opposite directions, the double-pole double-throw switch is used to connect the first positive output terminal to the first inverting input terminal and the first negative output terminal to the first positive input terminal according to the phase adjustment signal.
[0014] In the audio playback circuit of some embodiments, the first sound module includes a first power amplifier and a first speaker; the first power amplifier is connected to the first positive output terminal and the first negative output terminal through a double-pole double-throw switch, and the first power amplifier is also connected to the first speaker.
[0015] In the audio playback circuit of some embodiments, the second sound module includes a second power amplifier and a second speaker; the second power amplifier is connected to the first positive output terminal and the first negative output terminal through a double-pole double-throw switch, and the second power amplifier is also connected to the second speaker.
[0016] An embodiment of the present application also provides a terminal device, which includes the above-mentioned audio playback circuit.
[0017] An audio playback method is also provided in an embodiment of the present application. The audio playback method is applied to the above-mentioned audio playback circuit. The audio playback method includes:
[0018] The control module controls the first sound-emitting module to emit sound waves of the first sound channel, and the second sound-emitting module to emit sound waves of the second sound channel;
[0019] When the sound waves of the first channel and the sound waves of the second channel are in opposite phases, the control module controls the phase adjustment module to adjust the phases of the sound waves of the first channel and the sound waves of the second channel to be the same.
[0020] In the audio playback method of some embodiments, the phase adjustment module includes a double-pole double-throw switch; the control module is provided with a control terminal, a first positive output terminal and a first negative output terminal; the first sound module has a first positive input terminal and a first negative input terminal; adjusting the phase of the sound wave of the first channel and the sound wave of the second channel to be the same includes:
[0021] Controlling the double-pole double-throw switch to connect the first positive output terminal to the first positive input terminal, and the first negative output terminal to the first negative input terminal;
[0022] Or the double-pole double-throw switch is controlled to connect the first positive output terminal to the first inverting input terminal, and the first negative output terminal to the first positive input terminal.
[0023] The present application provides an audio playback circuit, method and terminal device, wherein a phase adjustment module is set in the audio playback circuit, and the phase adjustment module is connected between a control module and a first sound module; when the phases of the first sound wave and the second sound wave are opposite, the control module controls the phase adjustment module to adjust the phase of the first sound wave and the phase of the second sound wave to be the same, so as to alleviate the problem of phase cancellation affecting the audio effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.
[0025] Figure 1 A schematic diagram of the structure of a first embodiment of an audio playback circuit provided in an embodiment of the present application.
[0026] Figure 2 A schematic diagram of the structure of a second embodiment of the audio playback circuit provided in an embodiment of the present application.
[0027] Figure 3 A flowchart of the steps of the audio playback method provided in an embodiment of the present application. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. The features specified as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.
[0030] See also Figure 1 This embodiment provides an audio playback circuit, which includes a control module 100, a first sound module 200, a second sound module 300 and a phase adjustment module 400. The control module 100 is connected to the first sound module 200 through the phase adjustment module 400, and the control module 100 is also connected to the second sound module 300.
[0031] Specifically, the control module 100 is used to control the first sound module 200 to emit sound waves of the first channel through the phase adjustment module 400, and to control the second sound module 300 to emit sound waves of the second channel; the phase adjustment module 400 is used to control the sound waves of the first channel to have the same phase as the sound waves of the second channel according to the phase adjustment signal output by the control module 100.
[0032] In this embodiment, the control module 100 encodes and decodes the audio signal, and outputs a control signal based on the audio signal to control the first sound module 200 to emit a sound wave of the first channel recorded as the first sound wave; at the same time, the second sound module 300 is controlled to emit a sound wave of the second channel recorded as the second sound wave, thereby realizing the audio playback. When two waves with the same frequency and opposite phases meet in space, their amplitudes will cancel each other out, resulting in a decrease or disappearance of the amplitude of the wave, that is, the phenomenon of sound phase cancellation. In this embodiment, the phase adjustment module 400 is connected between the control module 100 and the first sound module 200; when the phases of the first sound wave and the second sound wave are opposite, the control module 100 controls the phase adjustment module 400 to adjust the phase of the first sound wave and the phase of the second sound wave to the same, so as to alleviate the problem of phase cancellation affecting the audio effect.
[0033] See also Figure 2In some embodiments, the phase adjustment module 400 includes a double-pole double-throw switch DPDT; the control module 100 is provided with a control terminal CT, a first positive output terminal P1 and a first negative output terminal N1; the first sounding module 200 has a first positive input terminal and a first negative input terminal, and the double-pole double-throw switch DPDT is used to connect the first positive output terminal P1 with the first positive input terminal according to the phase adjustment signal, and the first negative output terminal N1 is connected to the first negative input terminal, that is, at this time, the S1 terminal of the double-pole double-throw switch DPDT is connected to the L1 terminal, and the S2 terminal of the double-pole double-throw switch DPDT is connected to the L2 terminal. Alternatively, the double-pole double-throw switch DPDT is used to connect the first positive output terminal P1 with the first negative input terminal according to the phase adjustment signal, and the first negative output terminal N1 is connected to the first positive input terminal, that is, at this time, the S1 terminal of the double-pole double-throw switch DPDT is connected to the L2 terminal, and the S2 terminal of the double-pole double-throw switch DPDT is connected to the L1 terminal.
[0034] Wherein, the phase adjustment signal includes a high level signal and a low level signal. The double-pole double-throw switch DPDT can connect the first positive output terminal P1 to the first positive input terminal according to the high level signal, and the first negative output terminal N1 is connected to the first inverting input terminal, and switch to the state where the first positive output terminal P1 is connected to the first inverting input terminal, and the first negative output terminal N1 is connected to the first positive input terminal. When the double-pole double-throw switch DPDT receives a low level signal, the state where the first positive output terminal P1 is connected to the first inverting input terminal, and the first negative output terminal N1 is connected to the first positive input terminal, is switched to the state where the first positive output terminal P1 is connected to the first positive input terminal, and the first negative output terminal N1 is connected to the first inverting input terminal. In the default state, the double-pole double-throw switch DPDT connects the first positive output terminal P1 to the first positive input terminal, and the first negative output terminal N1 is connected to the first inverting input terminal, so that a path is formed between the control module 100 and the second sound module 300.
[0035] In some embodiments, the control module 100 is further provided with a second positive output terminal P2 and a second negative output terminal N2; the second sound module 300 has a second positive input terminal and a second negative input terminal. The second positive output terminal P2 is connected to the second positive input terminal, and the second negative output terminal N2 is connected to the second negative input terminal. Compared with the first sound module 200, the phase adjustment module 400 is not provided between the second sound module 300 and the control module 100. That is, in this embodiment, for an audio playback circuit with two channels, the phase adjustment module 400 is only provided in one of the channels to adjust the sound waves of the channel to maintain the same phase with the sound waves of the other channel.
[0036] Specifically, when the sound outlet of the first sound module 200 and the sound outlet of the second sound module 300 are in the same direction, the second positive output terminal P2 is connected to the second positive input terminal, and the second negative output terminal N2 is connected to the second negative input terminal, which is equivalent to the control module 100 being connected in a positive phase to the second sound module 300. The double-pole double-throw switch DPDT is used to connect the first positive output terminal P1 to the first positive input terminal and the first negative output terminal N1 to the first negative input terminal according to the phase adjustment signal, so that the control module 100 and the first sound module 200 are connected in a positive phase, thereby ensuring that the phases of the first sound wave and the second sound wave are consistent.
[0037] When the sound outlet of the first sound module 200 and the sound outlet of the second sound module 300 are in opposite directions, at this time, because the second positive output terminal P2 is connected to the second positive input terminal, and the second negative output terminal N2 is connected to the second negative input terminal, it is equivalent to the control module 100 being connected to the second sound module 300 in positive phase. If the control module 100 and the first sound module 200 are connected in positive phase, the first sound wave and the second sound wave are in opposite phases. In order to keep the first sound wave and the second sound wave in the same phase, the double-pole double-throw switch DPDT is used to connect the first positive output terminal P1 to the first negative input terminal according to the phase adjustment signal, and the first negative output terminal N1 is connected to the first positive input terminal, so that the control module 100 and the first sound module 200 are switched to the reverse connection, and the phase of the first sound wave is flipped 180 degrees, so as to ensure that the phase between the first sound wave and the second sound wave is consistent when the first sound module 200 and the second sound module 300 are in opposite directions, so as to alleviate the problem of phase cancellation and improve the audio effect.
[0038] As an embodiment, the first sound module 200 includes a first power amplifier PA1 and a first speaker 210; the first power amplifier PA1 is connected to a first positive output terminal P1 and a first negative output terminal N1 through a double-pole double-throw switch DPDT, and the first power amplifier PA1 is also connected to the first speaker 210. The first positive input terminal is the positive input terminal of the first power amplifier PA1, and the first negative input terminal is the negative input terminal of the first power amplifier PA1. The first power amplifier PA1 and the first speaker 210 are connected in a positive phase. When the first positive output terminal P1 is connected to the first negative input terminal, and the first negative output terminal N1 is connected to the first positive input terminal, the first sound wave output by the first speaker 210 is in a negative phase; when the first positive output terminal P1 is connected to the first positive input terminal, and the first negative output terminal N1 is connected to the first negative input terminal, the first sound wave output by the first speaker 210 is in a positive phase.
[0039] As an embodiment, the second sound module 300 includes a second power amplifier PA2 and a second speaker 310; the second power amplifier PA2 is connected to the first positive output terminal and the first negative output terminal N1 through a double-pole double-throw switch DPDT, and the second power amplifier PA2 is also connected to the second speaker 310. Among them, the second positive input terminal is the positive input terminal of the second power amplifier PA1, and the second negative input terminal is the negative input terminal of the second power amplifier PA1. The second power amplifier PA1 and the second speaker 310 maintain a positive phase connection; the second positive output terminal P2 is connected to the second positive input terminal, and the second negative output terminal N2 is connected to the second negative input terminal. The second sound wave output by the second speaker 310 is positive phase.
[0040] As an embodiment, the control module 100 includes a processor integrated with an audio codec. After processing the audio signal, the processor controls the first sound module 200 to output the sound wave of the first channel, and controls the second sound module 300 to output the sound wave of the second channel. Specifically, the first sound module 200 and the second sound module 300 amplify the signal output by the processor and drive the corresponding speaker to emit sound. A speaker is an electroacoustic device that converts electrical energy into sound energy and is widely used in mobile phones, computers, navigators, telephones and other devices; for example, for a paper cone speaker, when the audio current output by the power amplifier passes through the voice coil of the speaker, due to the interaction between the magnetic field and the voice coil, the voice coil produces a high-variable motion, and the voice coil is fixed on the paper cone. The voice coil vibrates with the signal, and the conversion of electrical energy to sound energy is realized through the vibration system.
[0041] The embodiment of the present application also provides a terminal device, which includes the above-mentioned audio playback circuit, by setting a phase adjustment module in the audio playback circuit, the phase adjustment module is connected between the control module and the first sound module; when the phases of the first sound wave and the second sound wave are opposite, the control module controls the phase adjustment module to adjust the phase of the first sound wave and the phase of the second sound wave to be the same, so as to alleviate the problem of phase cancellation affecting the audio effect and improve the reliability of the terminal device. Since the audio playback circuit is described in detail above, it will not be repeated here.
[0042] Among them, the terminal device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc., and can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., and the embodiments of the present application are not specifically limited.
[0043] See also Figure 3 The embodiment of the present application further provides an audio playback method, which is applied to the above audio playback circuit, and the audio playback method includes:
[0044] 101. The control module controls the first sound module to emit a sound wave of a first channel, and the second sound module to emit a sound wave of a second channel;
[0045] 102. When the sound waves of the first channel and the sound waves of the second channel are in opposite phases, the control module controls the phase adjustment module to adjust the phases of the sound waves of the first channel and the sound waves of the second channel to be the same.
[0046] In this embodiment, the control module encodes and decodes the audio signal, and outputs a control signal based on the audio signal to control the first sound module to emit a sound wave of the first channel recorded as the first sound wave; at the same time, the second sound module is controlled to emit a sound wave of the second channel recorded as the second sound wave, thereby realizing the audio playback. When two waves with the same frequency and opposite phases meet in space, their amplitudes will cancel each other out, resulting in a decrease or disappearance of the amplitude of the wave, that is, the phenomenon of sound phase cancellation. In this embodiment, the phase adjustment module is connected between the control module and the first sound module; when the phases of the first sound wave and the second sound wave are opposite, the control module controls the phase adjustment module to adjust the phase of the first sound wave and the phase of the second sound wave to the same, so as to alleviate the problem of phase cancellation affecting the audio effect.
[0047] In some embodiments, the phase adjustment module includes a double-pole double-throw switch; the control module is provided with a control end, a first positive output end and a first negative output end; the first sounding module has a first positive input end and a first negative input end; step 200 includes: controlling the double-pole double-throw switch to connect the first positive output end with the first positive input end, and the first negative output end with the first negative input end, or controlling the double-pole double-throw switch to connect the first positive output end with the first negative input end, and the first negative output end with the first positive input end.
[0048] Wherein, the phase adjustment signal includes a high level signal and a low level signal. The high level signal controls the double-pole double-throw switch to connect the first positive output terminal with the first positive input terminal, and the first negative output terminal with the first inverting input terminal, and switches to connect the first positive output terminal with the first inverting input terminal, and the first negative output terminal with the first positive input terminal. The low level signal controls the double-pole double-throw switch to connect the first positive output terminal with the first inverting input terminal, and the first negative output terminal with the first positive input terminal, and switches to connect the first positive output terminal with the first positive input terminal, and the first negative output terminal with the first inverting input terminal. In the default state, the double-pole double-throw switch connects the first positive output terminal with the first positive input terminal, and the first negative output terminal with the first inverting input terminal, so that a path is formed between the control module and the second sounding module, thereby realizing the adjustment of the phase of the first sound wave.
[0049] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0050] The audio playback circuit provided in the embodiments of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An audio playback circuit, characterized in that: The audio playback circuit includes a control module, a first sound module, a second sound module and a phase adjustment module, wherein the control module is connected to the first sound module through the phase adjustment module, and the control module is also connected to the second sound module; The control module is used to control the first sound-emitting module to emit a sound wave of a first channel through the phase adjustment module, and is used to control the second sound-emitting module to emit a sound wave of a second channel; The phase adjustment module is used to adjust the phases of the sound waves of the first channel and the second channel to be the same according to the phase adjustment signal output by the control module when the phases of the sound waves of the first channel and the second channel are opposite.
2. The audio playback circuit according to claim 1, characterized in that: The phase adjustment module includes a double-pole double-throw switch; the control module is provided with a control terminal, a first positive output terminal and a first negative output terminal; the first sounding module has a first positive input terminal and a first negative input terminal; The double-pole double-throw switch is used to connect the first positive output terminal to the first positive input terminal, and the first negative output terminal to the first inverting input terminal according to the phase adjustment signal; or the double-pole double-throw switch is used to connect the first positive output terminal to the first inverting input terminal, and the first negative output terminal to the first positive input terminal according to the phase adjustment signal.
3. The audio playback circuit according to claim 2, characterized in that: The control module is also provided with a second positive output terminal and a second negative output terminal; the second sounding module has a second positive input terminal and a second negative input terminal; The second positive output terminal is connected to the second positive input terminal, and the second negative output terminal is connected to the second negative input terminal.
4. The audio playback circuit according to claim 3, characterized in that: When the sound outlet of the first sound module and the sound outlet of the second sound module are oriented in the same direction, the double-pole double-throw switch is used to connect the first positive output terminal to the first positive input terminal and the first negative output terminal to the first negative input terminal according to the phase adjustment signal.
5. The audio playback circuit according to claim 3, characterized in that: When the sound outlet of the first sound module and the sound outlet of the second sound module are in opposite directions, the double-pole double-throw switch is used to connect the first positive output terminal to the first inverting input terminal and the first negative output terminal to the first positive input terminal according to the phase adjustment signal.
6. The audio playback circuit according to claim 4 or 5, characterized in that: The first sound-emitting module includes a first power amplifier and a first speaker; the first power amplifier is connected to the first positive output terminal and the first negative output terminal through the double-pole double-throw switch, and the first power amplifier is also connected to the first speaker.
7. The audio playback circuit according to claim 4 or 5, characterized in that: The second sound-emitting module includes a second power amplifier and a second speaker; the second power amplifier is connected to the first positive output terminal and the first negative output terminal through the double-pole double-throw switch, and the second power amplifier is also connected to the second speaker.
8. A terminal device, characterized in that: The terminal device comprises the audio playback circuit as described in any one of claims 1-7.
9. An audio playing method, characterized in that: The audio playback method is applied to the audio playback circuit according to any one of claims 1 to 7, and the audio playback method comprises: The control module controls the first sound module to emit a sound wave of a first channel, and the second sound module to emit a sound wave of a second channel; When the sound waves of the first channel and the sound waves of the second channel are in opposite phases, the control module controls the phase adjustment module to adjust the phases of the sound waves of the first channel and the sound waves of the second channel to be the same.
10. The audio playing method according to claim 9, characterized in that: The phase adjustment module includes a double-pole double-throw switch; the control module is provided with a control terminal, a first positive output terminal and a first negative output terminal; the first sounding module has a first positive input terminal and a first negative input terminal; the phase adjustment of the sound wave of the first sound channel and the sound wave of the second sound channel to be the same includes: Controlling the double-pole double-throw switch to connect the first positive output terminal to the first positive input terminal, and the first negative output terminal to the first negative input terminal; Or control the double-pole double-throw switch to connect the first positive output terminal to the first inverting input terminal, and the first negative output terminal to the first positive input terminal.