Audio power amplifier circuit, audio driving method and electronic equipment

Abstract

The invention discloses an audio power amplifier circuit, an audio driving method and electronic equipment, and belongs to the technical field of audio driving. Wherein the audio power amplifier circuit comprises an audio driving circuit and a loudspeaker, the audio driving circuit is connected with the loudspeaker, the audio driving circuit comprises a power amplification module, and the power amplification module is connected with the loudspeaker; the voltage regulation module is connected with the power amplification module; and the envelope tracking module is connected with the voltage regulating module, and the envelope tracking module is used for receiving the digital audio signal and acquiring a signal parameter of the digital audio signal, and controlling the voltage regulating module to increase or decrease a voltage value of a power supply signal for supplying power to the power amplification module based on the signal parameter.

Description

Technical Field

[0001] The present application belongs to the field of audio driver technology, and specifically relates to an audio power amplifier circuit, an audio driver method and an electronic device. Background Art

[0002] In the related art, to reduce the energy consumption of speaker amplifiers, audio amplifier circuits typically incorporate a boost switching power supply to increase the supply voltage. The input voltage of a typical boost switching power supply is approximately 3.0V to 4.45V, while the required voltage range for speaker amplifiers is generally around 6.5V to 11V. This results in a large voltage difference between the input and output of the boost switching power supply, necessitating a higher switching frequency. This higher switching frequency results in greater switching losses, resulting in higher energy consumption in the audio amplifier circuit. Summary of the Invention

[0003] The present application aims to provide an audio power amplifier circuit, an audio driving method and an electronic device, which can solve the problem of high energy consumption of the audio power amplifier circuit in the related art.

[0004] In a first aspect, an embodiment of the present application provides an audio power amplifier circuit, the audio power amplifier circuit comprising:

[0005] The audio driving circuit and the speaker are connected, and the audio driving circuit includes:

[0006] A power amplifier module connected to the speaker;

[0007] A voltage regulating module connected to the power amplifying module;

[0008] The envelope tracking module is connected to the voltage regulation module. The envelope tracking module is used to receive the digital audio signal and obtain its signal parameters, and control the voltage regulation module based on the signal parameters to increase or decrease the voltage value of the power supply signal to the power amplifier module.

[0009] In a second aspect, an embodiment of the present application provides an audio driving method, which is performed by the audio power amplifier circuit provided in the first aspect, wherein the audio power amplifier circuit includes a power amplification module; the audio driving method includes:

[0010] Receive digital audio signals and obtain their signal parameters;

[0011] Based on the signal parameters, the voltage value of the power supply signal supplied to the power amplifier module is increased or decreased.

[0012] In a third aspect, an embodiment of the present application proposes an electronic device, comprising the audio power amplifier circuit proposed in the first aspect.

[0013] In a fourth aspect, an embodiment of the present application proposes a readable storage medium, which stores a program or instruction. When the program or instruction is executed by a processor, the steps of the audio driving method of the second aspect are implemented.

[0014] In an embodiment of the present application, the envelope tracking module is used to track the signal parameters of the digital audio signal, and according to the changes in the signal parameters of the audio signal, the voltage regulating module is controlled to dynamically adjust the output voltage, thereby dynamically adjusting the voltage of the power supply signal of the power amplifier module, so that the power amplifier module can drive the speaker to sound at the minimum operating voltage that meets the audio external speaker effect, thereby reducing the overall power consumption of the audio power amplifier circuit.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A schematic structural diagram of an electronic device according to some embodiments of the present application is shown;

[0018] Figure 2 A schematic structural diagram of an envelope tracking module according to some embodiments of the present application is shown;

[0019] Figure 3 A schematic diagram showing the structure of an electronic device according to some embodiments of the present application is shown;

[0020] Figure 4 A circuit diagram showing an envelope tracking output circuit according to some embodiments of the present application;

[0021] Figure 5 The figure shows the waveform of the output of the Boost switching power supply and the output of the speaker in the related art;

[0022] Figure 6 A waveform diagram showing the output of the voltage regulating module and the output of the speaker in some embodiments of the present application is shown;

[0023] Figure 7 shows a waveform diagram of a power supply signal of a power amplifier module according to some embodiments of the present application;

[0024] Figure 8 A flowchart of generating a preset query table in some embodiments of the present application is shown;

[0025] Figure 9 A schematic diagram showing frequency response parameters of some embodiments of the present application;

[0026] Figure 10 A schematic diagram showing total harmonic distortion plus noise parameters of some embodiments of the present application is shown;

[0027] Figure 11 shows waveform diagrams of power supply signals according to some embodiments of the present application;

[0028] Figure 12 A flowchart of an audio driving method according to some embodiments of the present application is shown.

[0029] Reference numerals:

[0030] 100 audio power amplifier circuit, 104 speaker, 106 audio driver circuit, 1061 power amplifier module, 1062 voltage regulator module, 1063 digital-to-analog conversion module, 1064 envelope tracking module, 10642 lookup table circuit, 10644 envelope tracking output circuit, 1065 first capacitor, 1066 second capacitor, 1067 anti-interference device;

[0031] 200 electronic equipment, 202 energy storage components, 2022 battery cells;

[0032] Vin is the input voltage, and Vcc is the supply voltage of the power amplifier module. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or phase connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0037] The following combination Figures 1 to 12 An audio power amplifier circuit, an audio driving method, and an electronic device according to embodiments of the present application are described.

[0038] In some embodiments of the present application, an audio power amplifier circuit 100 is provided. The audio power amplifier circuit 100 includes:

[0039] The audio driving circuit 106 and the speaker 104 are connected. The audio driving circuit 106 includes:

[0040] A power amplifier module 1061 is connected to the speaker 104;

[0041] The voltage regulating module 1062 is connected to the power amplifying module 1061;

[0042] The envelope tracking module 1064 is connected to the voltage regulation module 1062. The envelope tracking module 1064 is used to receive the digital audio signal and obtain its signal parameters, and control the voltage regulation module based on the signal parameters to increase or decrease the voltage value of the power supply signal to the power amplifier module 1061.

[0043] In an embodiment of the present application, an audio power amplifier circuit 100 is applied to an electronic device 200, including but not limited to a mobile phone, a tablet computer, a game console, a wearable display device, and the like. The electronic device 200 includes an energy storage component 202 and a speaker 104. The energy storage component 202 is used to power the audio power amplifier circuit 100 and the speaker 104. For example, there are multiple speakers 104, and the multiple speakers 104 can form a multi-channel speaker system.

[0044] The audio driver circuit 106 is used to drive the speaker 104 to produce sound. The audio driver circuit 106 includes a power amplifier and a voltage regulator module 1062. To achieve power amplification, power must be supplied to the power amplifier module 1061. It is understood that the greater the volume of sound required from the speaker 104, the greater the power of the drive signal driving the speaker 104, and the higher the voltage of the power supply signal to the power amplifier module 1061.

[0045] In related technologies, boost switching power supplies in smart amplifiers for electronic devices such as mobile phones typically provide multi-stage voltage boosting. At the maximum boost level, the boost switching power supply outputs a voltage signal between 6.5V and 12.5V. Since the power supply voltage of a mobile phone is generally around 3V to 4.45V, the voltage difference between the input and output voltages of the boost switching power supply ranges from 3.5V to 8V. Excessive voltage difference increases the switching frequency or duty cycle of the boost switching power supply's PWM modulation, resulting in higher switching losses and increased power consumption.

[0046] In this regard, Figure 1 As shown, the voltage regulating module 1062 of the present application is improved from the existing single Boost switching power supply to a Boost / Buck two-in-one voltage regulating module 1062 that can increase and decrease the voltage. According to the audio source signal, it chooses to increase or decrease the voltage value of the power supply signal of the power amplifier module 1061.

[0047] in, Figure 1 and Figure 2 The meanings of the signal names in are as follows:

[0048] SW: switch signal of the voltage regulating module 1062;

[0049] GREG: reference voltage;

[0050] VBST: output voltage of the voltage regulator module 1062;

[0051] PVDD: input voltage of the power amplifier module 1061;

[0052] OUT_P: audio positive phase output;

[0053] OUT_N: audio inverting output;

[0054] VSNS-P: voltage detection positive input;

[0055] VSNS-N: voltage detection negative input;

[0056] I2S: I2S bus, used to transmit audio input signals;

[0057] I2C: I2C bus, used to transmit control signals;

[0058] SDZ: shutdown reset signal;

[0059] ADC: analog-to-digital conversion device.

[0060] For example, when the amplitude of the audio source signal is large, the voltage of the power supply signal of the power amplification module 1061 is increased, thereby increasing the power of the audio source signal. When the amplitude of the audio source signal is small, the voltage of the power supply signal of the power amplification module 1061 is reduced.

[0061] By setting up the voltage regulating module 1062, the supply voltage of the power amplifier module 1061 can be further reduced when the amplitude of the audio source signal is small, thereby reducing the power consumption of the power amplifier module 1061, reducing the overall power consumption of the audio power amplifier circuit, and improving the battery life of the electronic device 200.

[0062] At the same time, the present application sets an envelope tracking module 1064 in the audio driving circuit 106, which tracks the signal parameters of the digital audio signal through the envelope tracking module 1064, and controls the voltage regulation module to dynamically adjust the output voltage according to the changes in the signal parameters of the audio signal, thereby dynamically adjusting the voltage of the power supply signal of the power amplifier module 1061, so that the power amplifier module 1061 can drive the speaker 104 to make sound at the minimum operating voltage that meets the audio external speaker effect, thereby reducing the overall power consumption of the audio power amplifier circuit.

[0063] In some embodiments of the present application, Figure 3 FIG. 4 shows a schematic diagram of the structure of the envelope tracking module of some embodiments of the present application. Figure 3 As shown, the envelope tracking module 1064 includes:

[0064] Table lookup circuit 10642, the table lookup circuit 10642 is used to determine the target voltage value according to the signal parameters and a preset lookup table;

[0065] The envelope tracking output circuit 10644 is connected to the lookup table circuit 10642. The envelope tracking output circuit 10644 is used to control the voltage regulation module 1062 according to the target voltage value, so that the voltage regulation module 1062 adjusts the voltage value of the power supply signal to the target voltage value.

[0066] In the embodiment of the present application, the envelope tracking module 1064 includes a lookup table circuit 10642 and an envelope tracking output circuit 10644. The lookup table circuit 10642 is a LUT (Look-Up Table) circuit. The lookup table circuit 10642 determines the voltage value of the power supply signal supplied to the power amplifier module 1061, i.e., the target voltage value, based on the signal parameters of the digital audio signal.

[0067] The envelope tracking output circuit 10644, namely the envelope tracking DAC output circuit (ETDAC), can control the voltage regulation module 1062 to output a power supply signal with a target voltage value. Figure 4 FIG. 1 shows a circuit diagram of the envelope tracking output circuit 10644 of some embodiments of the present application. Figure 4 As shown, Vbat is the output voltage of the battery module. The envelope tracking output circuit 10644 includes an amplifier envelope (Env amp). Envelope tracking (ET) technology dynamically adjusts the RF power amplifier (PA) supply voltage Vcc to match the envelope variation of the input signal, thereby improving system energy efficiency. The DAC plays a key role in this technology, converting the digital envelope signal into a high-precision analog control signal to drive the dynamic power system. The analog signal output by the DAC is amplified by the operational amplifier and then drives the switching power supply to adjust the PA supply voltage.

[0068] Since the final output voltage of the voltage regulating module 1062 has a certain margin, the voltage value of the power supply signal of the power amplifying module 1061 is higher than the voltage amplitude of the audio source signal. This excess energy will lead to power waste. For example, Figure 5 FIG1 shows a waveform diagram of the output of the Boost switching power supply and the speaker output in the related art, as shown in FIG1 . Figure 5 As shown, the blue waveform is the speaker output signal, and the purple curve is the output signal of the Boost switching power supply in the related art, wherein there is a large voltage difference between the Boost switching power supply output signal and the speaker output signal.

[0069] and Figure 6 FIG. 1 shows a waveform diagram of the output of the voltage regulating module 1062 and the output of the speaker 104 in some embodiments of the present application. After the envelope tracking module 1064 is set, as shown in FIG. Figure 6 As shown, the blue waveform is the output signal of the speaker 104, the purple curve is the output signal of the Boost switching power supply in the related art, and the red curve is the voltage of the output signal of the voltage regulating module 1062. At this time, the voltage of the output signal of the voltage regulating module 1062 is consistent with the voltage of the output signal of the speaker 104, thereby improving efficiency and reducing energy consumption.

[0070] Figure 7 FIG1 shows a waveform diagram of a power supply signal of the power amplifier module 1061 in some embodiments of the present application, such as Figure 7 As shown, the blue waveform is the output signal of the speaker 104, the green curve is the power supply signal, and finally the voltage value of the power supply signal of the power amplifier module 1061 matches the voltage value of the audio source signal.

[0071] In some embodiments of the present application, Figure 3 A schematic diagram of the structure of an electronic device 200 in some embodiments of the present application is shown. Figure 3 As shown, the audio driving circuit 106 further includes:

[0072] The digital-to-analog conversion module 1063 is connected to the power amplification module and is used to receive the digital audio signal and output a sound source signal corresponding to the digital audio signal;

[0073] The power amplification module 1061 is further configured to drive the speaker 104 to produce sound through the audio source signal.

[0074] In an embodiment of the present application, the audio driver circuit includes an analog-to-digital converter (ADC). The digital-to-analog converter module 1063 receives a digital audio signal sent from the processor of the electronic device 200 and performs a digital-to-analog conversion on it to obtain a corresponding audio source signal. The audio source signal is an analog signal. The power amplifier module 1061 receives the audio source signal and amplifies the audio source signal. The amplified audio source signal drives the speaker 104 to produce sound, ensuring that the speaker 104 has sufficient sound volume and a clear sound field.

[0075] The signal parameters of the digital audio signal, including signal frequency and signal amplitude, determine the required sound volume of the speaker 104. The sound volume of the speaker 104 is positively correlated with the power of the audio source signal applied to the speaker 104, and is therefore also related to the voltage value of the power supply signal of the power amplifier module 1061.

[0076] Therefore, the voltage value of the power supply signal of the power amplifier module 1061 is dynamically adjusted according to the signal parameters of the digital audio signal, so as to further improve the efficiency of the power amplifier module 1061 and reduce the overall power consumption of the audio amplifier circuit while ensuring the audio speaker effect.

[0077] In some embodiments of the present application, the power amplification module 1061 is further configured to receive a plurality of preset audio signals; the plurality of preset audio signals have different signal parameters;

[0078] When the power amplifying module 1061 receives the first audio signal among the plurality of preset audio signals, the voltage regulating module 1062 sets the voltage value of the power supply signal to the lowest voltage value;

[0079] When the frequency response parameter or the total harmonic distortion plus noise parameter of the speaker 104 does not meet the preset conditions, the voltage regulating module 1062 increases the voltage value of the power supply signal;

[0080] Alternatively, when the frequency response parameters and the total harmonic distortion plus noise parameters of the speaker 104 both meet the preset conditions, the voltage regulation module 1062 outputs the current voltage value;

[0081] The current voltage value and the signal parameter of the first audio signal are stored in association with each other in a database, and when the signal parameter of each of the plurality of preset audio signals is stored in association with a voltage value, a preset query table is generated based on the database.

[0082] In the embodiment of the present application, table lookup circuit 10642 searches a preset table to find an appropriate target voltage value based on the frequency and amplitude of the digital audio signal. A software algorithm is designed to find the minimum supply voltage that satisfies frequency response parameters and total harmonic distortion plus noise (THD+N) parameters for digital audio signals of different frequencies and amplitudes.

[0083] For example, Figure 8 A flow chart of generating a preset query table in some embodiments of the present application is shown. Figure 8 Shown, including:

[0084] Step 802: input different audio source signal frequencies to the power amplification module based on a preset audio source signal frequency range;

[0085] Step 804: inputting different audio source signal amplitudes into the power amplification module based on a preset audio source signal voltage range;

[0086] Step 806 , scanning the PA voltage Vcc from low to high based on the preset PA voltage range and the preset scanning interval;

[0087] Step 808, determine whether the frequency response parameters meet the requirements; if yes, proceed to step 810, otherwise return to step 806;

[0088] Step 810, determine whether THD+N meets the requirements; if yes, proceed to step 812, otherwise return to step 806;

[0089] Step 812, recording the target voltage under the current signal parameters;

[0090] Step 814, determine whether to scan all signal amplitudes; if yes, go to step 816, otherwise return to step 804;

[0091] Step 816, determine whether all signal frequencies are scanned; if yes, proceed to step 818, otherwise return to step 802;

[0092] Step 818: Generate a preset query table.

[0093] Before the electronic device 200 is actually used, according to preset audio signals with different signal frequencies and different signal amplitudes, the audio signals with different signal parameters are scanned from low to high, and the minimum driving voltage that can meet the requirements of total harmonic distortion plus noise parameters and frequency response parameters is obtained, and the correspondence between different signal parameters and target voltage values is obtained, and finally a preset query table is obtained.

[0094] in, Figure 9 A schematic diagram showing frequency response parameters of some embodiments of the present application is shown. The upper limit standards of frequency response parameters for different signals are as follows: Figure 9 For example, the frequency response parameter standards of common mobile phones when playing externally are shown in Table 1:

[0095] Table 1

[0096] Frequency (Hz) 300 500 800 Lower limit amplitude (dB) 70 80 85 Frequency (Hz) 4000 8000 Upper limit amplitude (dB) 102 102

[0097] As shown in Table 1, for different preset audio signals, the upper limit or lower limit of the corresponding response parameter is set according to the signal frequency of the preset audio signal. When the signal frequency of the preset audio signal is less than a set threshold frequency and the frequency response parameter is not less than the upper threshold, it is determined that the frequency response parameter meets the preset condition. When the signal frequency of the preset audio signal is greater than another set threshold frequency and the frequency response parameter is not greater than the lower threshold, it is determined that the frequency response parameter meets the preset condition.

[0098] For example, taking the frequency of the sound source signal as 300Hz, at 300Hz, if the sound volume played by the speaker is less than 70dB, it is determined that the frequency response parameter does not meet the preset conditions. Conversely, if the sound volume played by the speaker is greater than or equal to 70dB, it is determined that the frequency response parameter meets the preset conditions.

[0099] For example, taking the sound source signal frequency of 4000Hz as an example, at 4000Hz, if the sound volume played by the speaker is higher than 102dB, it is determined that the frequency response parameter does not meet the preset conditions. Conversely, if the sound volume played by the speaker is less than or equal to 102dB, it is determined that the frequency response parameter meets the preset conditions.

[0100] Figure 10Schematic diagram of total harmonic distortion plus noise parameters of some embodiments of the present application is shown. The upper limit standards of total harmonic distortion plus noise parameters for different signals are as follows: Figure 10 For example, the THD+N parameter standards for common mobile phones when playing externally are shown in Table 2:

[0101] Table 2

[0102] 230 300 400 500 600 20000 Upper limit standard 35 30 24 19 131 13

[0103] As shown in Table 2, when the frequency response (volume) and input voltage Vin are fixed, THD+N decreases as the supply voltage Vcc increases. Therefore, by adopting a step-by-step iterative method to adjust the Vcc voltage, it is possible to achieve a certain minimum target voltage, so that THD+N is less than a specific threshold, which is the upper limit standard in Table 2.

[0104] For different preset audio signals, corresponding THD+N upper limits are set based on the signal amplitude of the preset audio signals. When the THD+N of the preset audio signal exceeds the upper limit corresponding to its signal amplitude, it is determined that the THD+N does not meet the preset condition. When the THD+N of the preset audio signal does not exceed the upper limit corresponding to its signal amplitude, it is determined that the THD+N meets the preset condition.

[0105] For example, if the signal amplitude of the audio source signal is 300mV, if THD+N exceeds 30, it is determined that the total harmonic distortion and noise parameters do not meet the preset conditions. When the voltage Vcc continues to increase, if THD+N does not exceed 30, it is determined that the total harmonic distortion and noise parameters meet the preset conditions, and the current Vcc is stored in the lookup table.

[0106] For example, it is assumed that the frequency range of the preset audio signal is 100 Hz to 20,000 Hz, the signal amplitude range is 0 mV to 400 mV, the scanning range of the target voltage value is 3 V to 12 V, and the voltage scanning interval is set to 0.5 V.

[0107] Assume that the signal frequency of the received first preset audio signal is 300Hz and the signal amplitude is 100mV, then the upper limit standard of the sound pressure at the corresponding frequency is 70dB, and the upper limit standard of TDH+N is 30. Scan the voltage from low to high. When the driving voltage is 5V, the 70dB sound pressure standard can be met, but the TDH+N standard is not met. At this time, continue scanning. When the driving voltage is 5.5V, the frequency response parameters and the total harmonic distortion plus noise parameters all meet the preset conditions. Then, the signal frequency of 300Hz, the signal amplitude of 100mV and the target voltage value of 5.5V are associated and stored in the preset lookup table. For example, Figure 11 The waveform diagram of the power supply signal of some embodiments of the present application is shown. The waveform diagram of the power supply signal of the power amplifier module 1061 is shown in FIG. Figure 11shown.

[0108] For example, the preset query table is shown in Table 3:

[0109] Table 3

[0110]

[0111] In actual use, according to the specific signal frequency and signal amplitude of the digital audio signal, the target voltage value can be quickly determined by querying the above table, thereby improving work efficiency.

[0112] In some embodiments of the present application, the audio driving circuit 106 further includes:

[0113] The first capacitor 1065 has a first end connected to the output end of the voltage regulating module 1062 and a second end connected to the ground.

[0114] In the embodiment of the present application, the voltage across the first capacitor 1065 is the same as the voltage value of the power supply signal of the power amplification module 1061 . The first capacitor 1065 can filter the power supply and reduce signal fluctuations.

[0115] In some embodiments of the present application, the audio driving circuit 106 further includes:

[0116] The second capacitor 1066 has a first end connected to the output end of the voltage regulating module 1062 , and a second end of the second capacitor 1066 is used to output a reference voltage to the voltage regulating module 1062 .

[0117] In the embodiment of the present application, the second capacitor 1066 is used to output a reference voltage of the voltage regulation module. The reference voltage provides a benchmark for the error amplifier. By comparing the output voltage feedback signal with the reference voltage, the signal duty cycle is adjusted to achieve voltage stabilization.

[0118] In some embodiments of the present application, the audio driving circuit 106 further includes:

[0119] The anti-interference device 1067 is connected in series between the power amplifier module 1061 and the speaker 104 .

[0120] In this embodiment of the present application, an anti-interference device 1067 is provided between the power amplifier module 1061 and the speaker 104 to suppress high-frequency noise and electromagnetic interference. For example, the anti-interference device 1067 is a ferrite bead, which utilizes the magnetic permeability of the ferrite material to convert high-frequency noise energy into heat energy, thereby achieving high-frequency noise suppression.

[0121] In some embodiments of the present application, an audio driving method is proposed, which is performed by the audio power amplifier circuit in any of the above embodiments, and the audio power amplifier circuit includes a power amplification module.

[0122] Figure 12 A flowchart of an audio driving method of an electronic device according to some embodiments of the present application is shown. Figure 12 As shown, the audio driving method includes:

[0123] Step 1202: receiving a digital audio signal and obtaining its signal parameters;

[0124] Step 1204: Based on the signal parameter, increase or decrease the voltage value of the power supply signal for supplying power to the power amplifier module.

[0125] In the embodiments of the present application, the signal parameters of the digital audio signal, including signal frequency and signal amplitude, determine the required sound volume of the speaker. The sound volume of the speaker is positively correlated with the power of the audio source signal applied to the speaker, and is therefore also associated with the voltage value of the power supply signal of the power amplifier module. Because the final output voltage of the voltage regulator module has a certain margin, the voltage value of the power supply signal of the power amplifier module is higher than the voltage amplitude of the audio source signal. This excess energy leads to power waste.

[0126] According to the signal parameters of the digital audio signal, the voltage value of the power supply signal when supplying power to the power amplifier module is dynamically adjusted, so that the power amplifier module can drive the speaker to produce sound at the minimum operating voltage that meets the audio external playback effect, thereby reducing the overall power consumption of the audio power amplifier circuit.

[0127] In some embodiments of the present application, increasing or decreasing the voltage value of the power supply signal for supplying power to the power amplifier module based on the signal parameter includes:

[0128] Determine the target voltage value based on the signal parameters and the preset lookup table;

[0129] Adjust the voltage value of the power supply signal to the target voltage value.

[0130] In this embodiment of the present application, a preset lookup table is queried based on signal parameters to find the minimum voltage value of the power supply signal to the power amplifier module while meeting the requirements, i.e., the target voltage value. Controlling the operation of the power amplifier circuit based on the target voltage value can reduce energy waste and lower the overall power consumption of the audio power amplifier circuit.

[0131] In some embodiments of the present application, after receiving the digital audio signal and obtaining its signal parameters, the method further includes:

[0132] Receive a digital audio signal and output a sound source signal corresponding to the digital audio signal;

[0133] The speaker is driven by the audio signal to produce sound.

[0134] In the embodiments of the present application, the signal parameters of the digital audio signal, including signal frequency and signal amplitude, determine the required sound volume of the speaker. The sound volume of the speaker is positively correlated with the power of the audio source signal applied to the speaker, and therefore also associated with the voltage value of the power supply signal of the power amplifier module.

[0135] Therefore, the voltage value of the power supply signal of the power amplifier module is dynamically adjusted according to the signal parameters of the digital audio signal, so as to further improve the efficiency of the power amplifier module and reduce the overall power consumption of the audio amplifier circuit while ensuring the audio amplifier effect.

[0136] In some embodiments of the present application, before determining the target voltage value according to the signal parameter and the preset lookup table, the audio driving method further includes:

[0137] receiving a plurality of preset audio signals; the plurality of preset audio signals have different signal parameters;

[0138] When a first audio signal among a plurality of preset audio signals is received, setting the voltage value of the power supply signal to a lowest voltage value;

[0139] Obtain the frequency response parameters and total harmonic distortion plus noise parameters of the speaker;

[0140] When the frequency response parameter or the total harmonic distortion plus noise parameter does not meet the preset conditions, the voltage value of the power supply signal is increased;

[0141] Alternatively, when both the frequency response parameter and the total harmonic distortion plus noise parameter meet preset conditions, the current voltage value of the power supply signal and the signal parameter of the first audio signal are associated and stored in a database;

[0142] In a case where a signal parameter of each of a plurality of preset audio signals is stored in association with a voltage value, a preset lookup table is generated based on a database.

[0143] In an embodiment of the present application, before the electronic device is actually used, based on preset audio signals with different signal frequencies and different signal amplitudes, audio signals with different signal parameters are scanned from low to high to obtain a minimum driving voltage that can meet the requirements of total harmonic distortion plus noise parameters and frequency response parameters, and obtain the corresponding relationship between different signal parameters and target voltage values, and finally obtain a preset lookup table.

[0144] In actual use, according to the specific signal frequency and signal amplitude of the digital audio signal, the target voltage value can be quickly determined by querying the above table, thereby improving work efficiency.

[0145] In some embodiments of the present application, an electronic device is proposed, which includes an audio power amplifier circuit as proposed in any of the above embodiments, and thus can also achieve all the same technical effects. To avoid repetition, it will not be described here.

[0146] In some embodiments of the present application, Figure 1 As shown, the electronic device also includes:

[0147] The energy storage component 202 is connected to the audio power amplifier circuit. The energy storage component is used to output a power supply signal to the power amplifier module. The energy storage component 202 includes at least two battery cells 2022, and the at least two battery cells 2022 are connected in series.

[0148] The present application provides at least two battery cells 2022 in the energy storage component 202, which are connected in series. Taking a common battery cell 2022 as an example, two battery cells 2022 connected in series can increase the output voltage to 6V to 8.9V. At this time, the input voltage of the voltage regulating module 1062 will also be increased to 6V to 8.9V. In this way, the voltage difference between the input voltage and the output voltage of the voltage regulating module 1062 is narrowed to between -2.4V and 5V, reducing the voltage difference between the input voltage and the output voltage. Therefore, it is possible to reduce the switching frequency, reduce switching losses, and thus reduce power consumption.

[0149] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0150] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0151] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0152] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An audio power amplifier circuit, characterized in that: The audio power amplifier circuit comprises: An audio driving circuit and a speaker, wherein the audio driving circuit and the speaker are connected, and the audio driving circuit comprises: a power amplifying module connected to the speaker; A voltage regulating module, connected to the power amplifying module; An envelope tracking module is connected to the voltage regulating module, and is used to receive a digital audio signal and obtain its signal parameters, and control the voltage regulating module to increase or decrease the voltage value of the power supply signal to the power amplifier module based on the signal parameters.

2. The audio power amplifier circuit according to claim 1, characterized in that: The envelope tracking module includes: a table lookup circuit, the table lookup circuit being used to determine a target voltage value based on the signal parameters and a preset lookup table; An envelope tracking output circuit is connected to the lookup table circuit, and the envelope tracking output circuit is used to control the voltage regulating module according to the target voltage value so that the voltage regulating module adjusts the voltage value of the power supply signal to the target voltage value.

3. The audio power amplifier circuit according to claim 1, characterized in that: The audio driving circuit further includes: a digital-to-analog conversion module, connected to the power amplification module, configured to receive the digital audio signal and output a sound source signal corresponding to the digital audio signal; The power amplification module is further configured to drive the loudspeaker to produce sound through the sound source signal.

4. The audio power amplifier circuit according to claim 2, characterized in that: The power amplification module is further configured to receive a plurality of preset audio signals; the plurality of preset audio signals have different signal parameters; When the power amplification module receives the first audio signal among the plurality of preset audio signals, the voltage regulation module sets the voltage value of the power supply signal to the lowest voltage value; When the frequency response parameter or the total harmonic distortion plus noise parameter of the speaker does not meet a preset condition, the voltage regulating module increases the voltage value of the power supply signal; Alternatively, when the frequency response parameter and the total harmonic distortion plus noise parameter of the speaker both meet the preset conditions, the voltage regulation module outputs the current voltage value; The current voltage value and the signal parameter of the first audio signal are associated and stored in a database, and, when the signal parameter of each of the plurality of preset audio signals is associated and stored with a voltage value, the preset query table is generated based on the database.

5. An audio driving method, characterized in that: The audio driving method is performed by the audio power amplifier circuit according to any one of claims 1 to 4, wherein the audio power amplifier circuit includes a power amplification module; the audio driving method includes: Receive digital audio signals and obtain their signal parameters; Based on the signal parameter, the voltage value of the power supply signal for supplying power to the power amplification module is increased or decreased.

6. The audio driving method according to claim 5, wherein: The increasing or decreasing the voltage value of the power supply signal for supplying power to the power amplification module based on the signal parameter includes: Determining a target voltage value according to the signal parameters and a preset lookup table; The voltage value of the power supply signal is adjusted to the target voltage value.

7. The audio driving method according to claim 5, characterized in that: After receiving the digital audio signal and obtaining its signal parameters, the method further includes: receiving the digital audio signal and outputting a sound source signal corresponding to the digital audio signal; The loudspeaker is driven to produce sound by the sound source signal.

8. The audio driving method according to claim 6, wherein: Before determining the target voltage value according to the signal parameter and the preset lookup table, the audio driving method further includes: receiving a plurality of preset audio signals; wherein the plurality of preset audio signals have different signal parameters; When a first audio signal among the plurality of preset audio signals is received, setting the voltage value of the power supply signal to a lowest voltage value; Obtain the frequency response parameters and total harmonic distortion plus noise parameters of the speaker; When the frequency response parameter or the total harmonic distortion plus noise parameter does not meet a preset condition, increasing the voltage value of the power supply signal; Alternatively, when both the frequency response parameter and the total harmonic distortion plus noise parameter satisfy the preset condition, the current voltage value of the power supply signal and the signal parameter of the first audio signal are associated and stored in a database; In a case where a signal parameter of each of the plurality of preset audio signals is stored in association with a voltage value, the preset lookup table is generated based on the database.

9. An electronic device, characterized in that: include: The audio power amplifier circuit according to any one of claims 1 to 4.

10. The electronic device according to claim 9, characterized in that Also includes: An energy storage component is connected to the audio power amplifier circuit, and is used to output a power supply signal to the power amplifier module. The energy storage component includes at least two battery cells, and the at least two battery cells are connected in series.

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