Display device and current-limiting control method of display device
By using a current limiting control device to attenuate and mix the current-limiting frequency band of the audio signal, the problem of unstable speaker current consumption is solved, current limiting and sound quality preservation are achieved, and power consumption is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HISENSE VISUAL TECH CO LTD
- Filing Date
- 2023-02-01
- Publication Date
- 2026-06-26
Smart Images
Figure CN116095567B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of display technology. More specifically, it relates to a display device and a current limiting control method for the display device. Background Technology
[0002] In related technologies, in electronic devices equipped with audio playback devices such as speakers, the current consumption is unstable because the sound played by the speakers is not in a fixed operating state in terms of volume and frequency. However, when designing power supply systems, extreme conditions must be considered, and the systems must be designed according to rated operating conditions, which leads to a significant increase in system redundancy costs.
[0003] In related technologies, the maximum amplification factor of a display device can typically be limited by restricting the duty cycle of pulse width modulation (PWM), thereby limiting the maximum output current. Alternatively, the maximum output current can be limited by limiting power, or the power supply amplitude can be limited by limiting the maximum voltage. However, all of these methods treat the audio playback device as a fixed impedance. Since the impedance of an audio playback device is not a fixed value but a function related to frequency, these methods are not effective in limiting current. Summary of the Invention
[0004] To address the problems described in the background section, some embodiments of the present invention provide a current limiting control method for a display device and an audio playback device, which reduces the current consumption of the audio playback device, avoids the problem of excessive current increasing the power consumption of the audio playback device and reducing the sound quality of the audio playback device, and thus reduces the power consumption of the audio playback device.
[0005] The technical solutions provided by some embodiments of the present invention are as follows:
[0006] In a first aspect, some embodiments of the present invention provide a display device, including:
[0007] The display screen is configured to display images.
[0008] An audio playback device is configured to play audio signals;
[0009] The audio playback device includes a flow limiting control device and an audio playback device;
[0010] A current limiting control device is configured to: determine at least one current limiting frequency band of an input audio signal; filter and acquire the audio signal corresponding to the current limiting frequency band, and filter and acquire the audio signal corresponding to a frequency band outside the current limiting frequency band in the input audio signal; determine the attenuation gain value of the audio signal corresponding to the current limiting frequency band, and attenuate the audio signal corresponding to the current limiting frequency band by the attenuation gain value; and mix the attenuated audio signal corresponding to the current limiting frequency band with the audio signal corresponding to a frequency band outside the current limiting frequency band in the input audio signal to obtain an output signal.
[0011] An audio playback device is configured to play the output signal of the current limiting control device.
[0012] Secondly, some embodiments of the present invention provide a current limiting control method for a display device, including:
[0013] Determine at least one current-limiting frequency band of the input audio signal and the attenuation gain value of the audio signal corresponding to the current-limiting frequency band;
[0014] Filter to obtain the audio signal corresponding to the current-limiting frequency band and the audio signal corresponding to the frequency band outside the current-limiting frequency band in the input audio signal;
[0015] The attenuation gain value is used to attenuate the audio signal corresponding to the current-limiting frequency band.
[0016] The attenuated audio signal corresponding to the current-limited frequency band is mixed with the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal to obtain the output signal.
[0017] As can be seen from the above technical solutions, the display device and the current limiting control method for the display device provided in some embodiments of the present invention include: a display screen configured to display an image; an audio playback device configured to play an audio signal; the audio playback device includes a current limiting control device and an audio playback device; the current limiting control device is configured to: determine at least one current limiting frequency band of the input audio signal and the attenuation gain value of the audio signal corresponding to the current limiting frequency band; filter to obtain the audio signal corresponding to the current limiting frequency band, and filter to obtain the audio signal corresponding to the frequency band outside the current limiting frequency band in the input audio signal; attenuate the gain value of the audio signal corresponding to the current limiting frequency band; and mix the attenuated audio signal corresponding to the current limiting frequency band with the audio signal corresponding to the frequency band outside the current limiting frequency band in the input audio signal to obtain an output signal; the audio playback device is configured to play the output signal of the current limiting control device. Therefore, the display device and current limiting control method for the display device provided in some embodiments of the present invention attenuate the gain value of at least one current limiting frequency band of the input audio signal, and mix the audio signal corresponding to the attenuated current limiting frequency band with the audio signal corresponding to the frequency band outside the current limiting frequency band of the input audio signal to obtain the output signal. This achieves current limiting of the audio signal in the current limiting frequency band, reduces the current consumption of the audio playback device, avoids the problem of excessive current increasing the power consumption of the audio playback device and reducing the sound quality of the audio playback device, and reduces the power consumption of the audio playback device. Attached Figure Description
[0018] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly described below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.
[0019] Figure 1 This is a schematic diagram showing the relationship between impedance and frequency of an audio playback device.
[0020] Figure 2 This is a schematic diagram illustrating the structure of an audio playback device according to an exemplary embodiment of the present invention;
[0021] Figure 3 This is a flowchart illustrating a flow control method for an audio playback device according to an exemplary embodiment of the present invention;
[0022] Figure 4 This is a schematic diagram illustrating the correspondence between current and frequency according to an exemplary embodiment of the present invention;
[0023] Figure 5 This is a schematic diagram illustrating the structure of another audio playback device according to an exemplary embodiment of the present invention;
[0024] Figure 6This is a schematic diagram illustrating the correspondence between frequency and signal amplitude according to an exemplary embodiment of the present invention;
[0025] Figure 7 This is a schematic diagram illustrating the correspondence between the input attenuation gain value and the output attenuation gain value of a first peak limiter according to an exemplary embodiment of the present invention;
[0026] Figure 8 This is a schematic diagram of the structure of a device according to an exemplary embodiment of the present invention. Detailed Implementation
[0027] To make the objectives and implementation methods of the present invention clearer, the exemplary embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of the present invention. Obviously, the exemplary embodiments described are only some embodiments of the present invention, and not all embodiments.
[0028] It should be noted that the brief descriptions of terminology in this invention are merely for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this invention. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.
[0029] In this invention, the terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms can be used interchangeably where appropriate.
[0030] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.
[0031] In related technologies, in electronic devices equipped with audio playback devices such as speakers, the current consumption is unstable because the volume and frequency of the sound played by the speakers are not in a fixed operating state. For example, when the audio playback device of a display device plays music, the tested current consumption of the audio playback device is mostly less than 3A, but can reach 6A for short periods. Moreover, this volume is measured under the condition that the display device is operating at maximum volume, which is very loud and exceeds the normal volume range that users can accept. Such usage is rare. However, when designing the power supply system, considering extreme conditions, it needs to be designed according to the rated operating condition of 6A. This leads to a significant increase in system redundancy costs. In the increasingly competitive consumer electronics market, providing users with cost-effective products is very important, and it also contributes to energy conservation and emission reduction for society.
[0032] In related technologies, in order to limit the current of display devices and reduce the current consumption of audio playback devices, thereby reducing power consumption, the following methods can usually be used for current limiting.
[0033] For example, the maximum amplification factor of a display device can be limited by restricting the duty cycle of pulse width modulation (PWM), thereby limiting the maximum output current. The principle is to modulate an analog audio signal with a fixed-frequency triangular wave, resulting in a square wave output. A larger duty cycle of the square wave indicates a stronger signal. The Class D signal is input differentially to the speaker, and after passing through a low-pass filter formed by the speaker, it can be restored to an analog audio signal.
[0034] For example, after knowing the current output voltage amplitude, the signal voltage of the amplifier circuit can be reduced by using negative feedback control, thereby controlling the output voltage and limiting the current.
[0035] For example, the power supply amplitude can also be limited by limiting the maximum voltage, thus achieving the purpose of current limiting. According to the current formula I=V / R, with the resistance impedance remaining constant, limiting the maximum voltage can achieve the purpose of current limiting. Therefore, some display devices with amplitude limiting functions in related technologies can limit the signal amplitude to a certain level, such as 3dB, to ensure that the maximum digital domain amplitude does not exceed -3dB, and both voltage and current can be reduced to 0.707 times their maximum values. For example, a comparator can be used to ensure that the voltage value of a signal higher than the voltage threshold is equal to the voltage threshold, while the voltage value of a signal lower than the voltage threshold is equal to the original signal voltage value.
[0036] The methods described above all treat audio playback devices, such as speakers, as equivalent to a fixed impedance. However, the impedance of a speaker is not a fixed value, but a function related to frequency. Figure 1 This is a schematic diagram showing the impedance and frequency relationship of an audio playback device. Figure 1 The horizontal axis represents frequency in Hz, and the vertical axis represents impedance in Ω. For example... Figure 1 As shown, the speaker impedance reaches approximately 30Ω between 50-60Hz, while it is approximately 6Ω at 10Hz and 300Hz. This means that the current reaches its maximum value at 10Hz and 300Hz. Therefore, the relationship between the speaker impedance and frequency needs to be taken as a factor in limiting the current to avoid excessive power consumption of the audio playback device.
[0037] To address the aforementioned problems, the present invention provides a display device.
[0038] In some embodiments, the display device includes:
[0039] The display screen is configured to display images.
[0040] An audio playback device configured to play audio signals.
[0041] Figure 2 This is a schematic diagram illustrating the structure of an audio playback device according to an exemplary embodiment of the present invention, such as... Figure 2 As shown, the audio playback device includes: a flow limiting control device 1 and an audio playback device 2;
[0042] The current limiting control device 1 is configured to: determine at least one current limiting frequency band of the input audio signal; filter and acquire the audio signal corresponding to the current limiting frequency band, and filter and acquire the audio signal corresponding to the frequency band outside the current limiting frequency band in the input audio signal; determine the attenuation gain value of the audio signal corresponding to the current limiting frequency band, and attenuate the audio signal corresponding to the current limiting frequency band by the attenuated gain value; and mix the attenuated audio signal corresponding to the current limiting frequency band with the audio signal corresponding to the frequency band outside the current limiting frequency band in the input audio signal to obtain an output signal.
[0043] The audio playback device 2 is configured to play the output signal of the current limiting control device 1.
[0044] Specifically, such as Figure 2As shown, the current limiting control device 1 can determine at least one current-limiting frequency band of the input audio signal, and filter and acquire the audio signal corresponding to the current-limiting frequency band and the audio signal corresponding to the frequency band outside the current-limiting frequency band respectively. For example, if the frequency range of the input audio signal is 20Hz-20kHz, and the current-limiting frequency band is, for example, 80Hz-100Hz, then the current limiting control device 1 will filter and acquire the audio signal corresponding to 80Hz-100Hz, the audio signal corresponding to 0Hz-80Hz, and the audio signal corresponding to 100Hz-20kHz respectively.
[0045] When the current of the audio playback device 2 corresponding to the current-limiting frequency band, such as the speaker, exceeds the threshold current, the attenuation gain value of the audio signal corresponding to the current-limiting frequency band is determined based on the proportion by which the speaker current exceeds the threshold current. The audio signal corresponding to the current-limiting frequency band is then attenuated by the corresponding attenuation gain value. The attenuated audio signal corresponding to the current-limiting frequency band is then mixed with the audio signal corresponding to a frequency band outside the current-limiting frequency band to obtain the complete output signal. After the current-limiting control device 1 outputs the output signal to the audio playback device 2, the audio playback device 2 plays the output signal.
[0046] In some embodiments of the present invention, the current limiting control device 1 in the audio playback device attenuates the gain value of at least one current limiting frequency band of the input audio signal, and mixes the audio signal corresponding to the attenuated current limiting frequency band with the audio signal corresponding to the frequency band outside the current limiting frequency band of the input audio signal to obtain the output signal. This achieves the limitation of the current of the audio signal in the current limiting frequency band, reduces the current consumption of the audio playback device 2, avoids the problem of excessive current increasing the power consumption of the audio playback device 2 and reducing the sound quality of the audio playback device 2, and reduces the power consumption of the audio playback device 2.
[0047] In some embodiments, such as Figure 2 As shown, the audio playback device also includes a power amplifier 3; the power amplifier 3 is configured to amplify the output signal of the current limiting control device 1 and transmit it to the audio playback device 2.
[0048] Specifically, such as Figure 2 As shown, when the power of the output signal of the current limiting control device 1 is low, and the audio playback device 2 cannot play the output signal of the current limiting control device 1, the audio playback device can also include a power amplifier 3. The power amplifier 3 amplifies the power of the output signal of the current limiting control device 1, and the amplified signal is output to the audio playback device 2 to drive the audio playback device 2 to emit sound. It should be noted that the power amplifier 3 can be, for example, a Class D amplifier, or a Class AB amplifier or other types of linear amplifier. The amplification principle of the output signal by the power amplifier 3 is well known to those skilled in the art, and some embodiments of the present invention do not limit this.
[0049] It should be noted that the current limiting control device 1 can be set separately on the power amplifier chip of the audio playback device, or it can be set on the power amplifier device 3. Some embodiments of the present invention do not limit this.
[0050] In some embodiments, such as Figure 2 As shown, the current limiting control device 1 includes:
[0051] The current-limiting frequency band calculation module 11 is configured to: determine at least one current-limiting frequency band of the input audio signal and the attenuation gain value of the audio signal corresponding to the current-limiting frequency band;
[0052] The filtering module 12 is configured to filter the audio signal corresponding to the current-limited frequency band and the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal.
[0053] Limiting module 13 is configured to attenuate the gain value of the audio signal corresponding to the current limiting frequency band;
[0054] The mixing module 14 is configured to mix the attenuated audio signal corresponding to the current-limited frequency band with the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal to obtain the output signal.
[0055] Specifically, such as Figure 2 As shown, the current limiting frequency band calculation module 11 in the current limiting control device 1 determines at least one current limiting frequency band of the input audio signal, and the current limiting frequency band calculation module 11 outputs the audio signal of the current limiting frequency band, such as the 80Hz-100Hz frequency band, to the filtering module 12. Figure 2 The example illustrates a filtering module 12, which includes, for instance, a first bandpass filter 121 and a first bandstop filter 122. The first bandpass filter 121 filters and acquires the audio signal corresponding to the current-limited frequency band centered at frequency point f, and the first bandstop filter 122 filters and acquires the audio signal corresponding to the frequency band outside the current-limited frequency band of the input audio signal. For example, the current-limited frequency band is, for instance, the 80Hz-100Hz band. The first bandpass filter 121 filters and acquires the audio signal corresponding to the current-limited frequency band centered at frequency point 90Hz, and the first bandstop filter 122 filters and acquires the audio signal from 0Hz to 80Hz and the audio signal from 100Hz to 20kHz.
[0056] After the current-limiting frequency band calculation module 11 determines the attenuation gain value G of the audio signal corresponding to the current-limiting frequency band, it outputs the attenuation gain value to the amplitude limiting module 13. The amplitude limiting module 13 attenuates the audio signal corresponding to the current-limiting frequency band and outputs the attenuated audio signal corresponding to the current-limiting frequency band to the mixing module 14. Figure 2 The limiting module 13 is illustrated as an amplifier, but it can also be any other device for limiting, and some embodiments of the present invention are not limited thereto.
[0057] The mixing module 14 mixes the audio signal output from the first band-stop filter 122 (corresponding to a frequency band outside the current-limiting band in the input audio signal) and the attenuated audio signal output from the limiting module 13 (corresponding to a current-limiting band), thereby obtaining the output signal. For example, the first bandpass filter 121 outputs the 80Hz-100Hz current-limiting band to the limiting module 13, the limiting module 13 attenuates the gain value of the audio signal in the 80Hz-100Hz current-limiting band, and outputs the attenuated audio signal corresponding to the 80Hz-100Hz current-limiting band to the mixing module 14. The first band-stop filter 122 outputs audio signals in the 0Hz-80Hz band and audio signals in the 100Hz-20kHz band to the mixing module 14, and the mixing module 14 mixes the audio signals in the 0Hz-80Hz band, the attenuated 80Hz-100Hz band, and the 100Hz-20kHz band.
[0058] It should be noted that the mixing module 14 can be, for example, a mixer. The specific working principle of the mixer is well known to those skilled in the art, and some embodiments of the present invention do not limit it.
[0059] It should be noted that the above embodiments only exemplify the method of mixing a current-limited frequency band. When the input audio signal includes multiple current-limited frequency bands, the above embodiments can be used for understanding. Some embodiments of the present invention will not be described in detail here.
[0060] In some embodiments, such as Figure 2 As shown, the current limiting control device 1 also includes: an audio effect preprocessing module 15, which is configured to: perform audio effect processing on the input audio signal.
[0061] Specifically, such as Figure 2As shown, after the audio signal is input, it can be pre-processed to ensure current limiting with minimal loss of sound quality. For example, the audio pre-processing module 15 can be an equalizer (EQ). An equalizer adjusts the timbre and reduces noise by amplifying or attenuating one or more frequency bands of the audio signal, thus improving sound quality. Alternatively, the audio pre-processing module 15 can be a dynamic compression (DRC) module. When the amplitude of the input audio signal is within a preset amplitude range, the audio processing device outputs the signal according to its original amplitude. However, when the amplitude is too large, the DRC module compresses the output signal amplitude to protect the speaker, limiting it to a certain range and improving the speaker's playback sound quality. Another example is a high-frequency filter. Since lower frequency bands in the audio signal reduce the sound output efficiency of the audio playback device 2, a high-frequency filter can filter the low-frequency input signal, improving the sound effect of the audio playback device 2.
[0062] It should be noted that the audio preprocessing module 15 may also include one or more other modules capable of performing audio effect processing. For example, the audio preprocessing module 15 may include at least one of the following modules: an audio equalizer, a dynamic compression module, and a high-frequency filter. It may also be other types of audio processing modules. The specific type of the audio preprocessing module 15 can meet the audio playback device 2's requirements for audio signal audio effect processing. Some embodiments of the present invention do not limit this.
[0063] Figure 3 This is a flowchart illustrating a current limiting control method for a display device according to an exemplary embodiment of the present invention. In some embodiments, the current limiting control device performs... Figure 3 The following steps are shown in the figure:
[0064] S101. Determine at least one current-limiting frequency band of the input audio signal and the attenuation gain value of the audio signal corresponding to the current-limiting frequency band.
[0065] S102. Filter and obtain the audio signal corresponding to the current-limited frequency band, and filter and obtain the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal.
[0066] S103, Attenuate the audio signal gain value corresponding to the current-limited frequency band.
[0067] S104. Mix the attenuated audio signal corresponding to the current-limited frequency band with the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal to obtain the output signal.
[0068] The display device and current limiting control method for the display device provided in some embodiments of the present invention attenuate the gain value of at least one current limiting frequency band of the input audio signal, and mix the audio signal corresponding to the attenuated current limiting frequency band with the audio signal corresponding to the frequency band outside the current limiting frequency band of the input audio signal to obtain the output signal. This achieves current limiting of the audio signal in the current limiting frequency band, reduces the current consumption of the audio playback device, avoids the problem of excessive current increasing the power consumption of the audio playback device and reducing the sound quality of the audio playback device, and reduces the power consumption of the audio playback device.
[0069] In some embodiments, the current limiting control device is configured to determine at least one current limiting frequency band of the input audio signal, specifically including:
[0070] Based on the impedance-frequency relationship of the audio playback device and the power supply voltage, determine the relationship between the current and frequency of the audio playback device.
[0071] Based on the relationship between the current and frequency of the audio playback device, the frequency band corresponding to the current of the audio playback device exceeding the threshold current is determined as the current-limiting frequency band.
[0072] Specifically, Figure 2 The diagram shows the current-limiting frequency band calculation module 11 connected to the power supply voltage VDD and the impedance-frequency relationship Zo(f). The relationship between current and frequency satisfies the following formula:
[0073] (1)
[0074] (2)
[0075] In formulas (1) and (2), Vin(f) is the voltage function of the input audio signal, which is frequency-dependent; A is the amplification factor; and Zo(f) represents the impedance-frequency relationship. Zo(f) satisfies the following formula:
[0076] (3)
[0077] In formula (3), Re is the pure resistance of the coil in the audio playback device, B is the magnetic induction intensity of the coil, L is the length of the coil, Rms is the frequency-related mechanical resistance, and Rmr is the frequency-related radiation resistance. As can be seen from the above formula (3), the current value of the audio signal is related to the frequency.
[0078] Specifically, the maximum value of Vin(f) × A cannot exceed the power supply voltage VDD, and since the switching transistor in the audio playback device has an on-resistance Rds, it is necessary to ensure that Vin(f) × A ≤ VDD - Imax × Rds. For example, the power supply voltage VDD is, for example, 20V, and the threshold current Ith is, for example, 2A. Figure 1 The illustrated diagram showing the impedance-frequency relationship of the speaker illustrates that the minimum impedance is 6Ω, and the corresponding current value of 3.3A exceeds the threshold current of 2A. Therefore, current limiting is required for this frequency. If the power supply voltage VDD is, for example, 12V, the threshold current Ith is, for example, 2A, and the minimum impedance is 6Ω, the corresponding current value of 2A does not exceed the threshold current of 2A. Therefore, current limiting for the audio signal is not necessary.
[0079] Figure 4 This is a schematic diagram illustrating the correspondence between current and frequency according to an exemplary embodiment of the present invention. Figure 4 The horizontal axis represents frequency, with the unit being Hz. Figure 4 The vertical axis represents the current, and the unit is ampere (A). Figure 4 The example illustrates that the current exceeds the threshold current Ith in the frequency band between frequencies f1 and f2, and the current exceeds the threshold current Ith in the frequency band between frequencies f3 and f4. Therefore, the current-limiting frequency bands can be determined to be between frequencies f1 and f2, and between frequencies f3 and f4. It should be noted that the correspondence between current and frequency can also be in other waveform forms, as long as the current-limiting frequency band satisfies the correspondence between current and frequency. Some embodiments of the present invention do not limit this.
[0080] Therefore, the current limiting frequency band calculation module in the current limiting control device can process audio signals from 20Hz to 20kHz. It can flexibly calculate based on the frequency information of the audio signal, ensuring that the current corresponding to the entire frequency band can be controlled to be less than or equal to the threshold current, thereby improving the sound quality of the audio playback device and increasing the processing accuracy of the audio signal.
[0081] In some embodiments, the current limiting control device is configured to determine at least one current limiting frequency band of the input audio signal, specifically including:
[0082] Based on the impedance-frequency correlation of audio playback devices, the frequency bands corresponding to the impedance of the audio playback device being less than the preset impedance value are determined as current-limiting frequency bands.
[0083] Specifically, according to Figure 1 As can be seen from the exemplary diagram illustrating the impedance-frequency relationship of an audio playback device, the impedance model of an audio playback device is generally shaped with a high impedance in the middle and low impedance at both ends. That is, there is one maximum impedance point R0 and two minimum impedance points RL and RH. The frequency corresponding to RL is, for example, [frequency missing]. Figure 4 In the example, the frequencies corresponding to fL and RH are: Figure 4 In the example, the frequencies corresponding to fH and R0 are, for example, Figure 4In the range f0, the frequency fL corresponding to the minimum impedance value RL can be found in the 20Hz-f0Hz interval, and the frequency fH corresponding to the minimum impedance value RH can be found in the f0Hz-20kHz interval. This allows us to determine two current-limiting frequency bands, i.e., using frequency point f... L The current-limiting frequency band is the center frequency, and the frequency point f H As the center frequency, the current-limiting bands theoretically have current values exceeding the threshold within these two current-limiting bands. Therefore, the frequency range can be fixed within these two current-limiting bands. Compared to calculating across the entire 20Hz-20kHz frequency band, the computational load of the current-limiting band calculation module is significantly reduced, improving its computational efficiency. Furthermore, it avoids the high cost associated with calculating across the entire 20Hz-20kHz frequency band using DSP (Digital Signal Processing) and Arm (Advanced RISC Machines) processing units, thus reducing the cost of audio playback devices.
[0084] It should be noted that frequencies fL and fH can also be directly input to the current-limiting frequency band calculation module to obtain the current-limiting frequency band, thereby avoiding calculation errors in the current-limiting frequency band calculation module and still obtaining the current-limiting frequency band when a current-limiting frequency band calculation model cannot be established, thus improving the accuracy of current-limiting control. Some embodiments of the present invention do not limit the specific method of obtaining frequencies fL and fH.
[0085] Figure 5 This is a schematic diagram illustrating the structure of another audio playback device according to an exemplary embodiment of the present invention, such as... Figure 5 As shown, the second bandpass filter 123 filters and obtains the current-limited frequency band centered on fL, the third bandpass filter 124 filters and obtains the current-limited frequency band centered on fH, the second bandstop filter 125 filters and obtains the audio signal corresponding to the frequency band outside the current-limited frequency band centered on fL, and the third bandstop filter 126 filters and obtains the audio signal corresponding to the frequency band outside the current-limited frequency band centered on fH.
[0086] For example, the second bandpass filter 123 filters and obtains the audio signal corresponding to the first current-limiting frequency band centered at 10Hz and outputs it to the first peak limiter 131. The first current-limiting frequency band is 0Hz-20Hz. The third bandpass filter 124 filters and obtains the audio signal corresponding to the second current-limiting frequency band centered at 300Hz and outputs it to the second peak limiter 132. The second current-limiting frequency band is 100Hz-500Hz. The second bandstop filter 125 filters and obtains the audio signal corresponding to 20Hz-50Hz. The third bandstop filter 126 filters and obtains the audio signal corresponding to 50Hz-100Hz.
[0087] In some embodiments, the current limiting control device is configured to determine the attenuation gain value of the audio signal corresponding to the current limiting frequency band, specifically including:
[0088] The attenuation gain value of the audio signal corresponding to the current-limited frequency band is determined based on the proportion by which the current of the audio playback device exceeds the threshold current.
[0089] Figure 6 This is a schematic diagram illustrating the correspondence between frequency and signal amplitude according to an exemplary embodiment of the present invention. Figure 6 The horizontal axis represents frequency in Hz, and the vertical axis represents signal amplitude in dBFS. For example... Figure 6 As shown, the current at the signal amplitude corresponding to BdBFS is small and does not exceed the current threshold, so it is not processed. When the current of the audio playback device corresponding to the current-limiting frequency band of the audio signal exceeds the threshold current, the signal amplitude corresponding to the current-limiting frequency band needs to be attenuated to limit the current of the audio playback device corresponding to the current-limiting frequency band. Figure 6 The example illustrates that the attenuation gain value of the audio signal corresponding to the current-limited frequency band centered at frequency point fL is G1, and the attenuation gain value of the audio signal corresponding to the current-limited frequency band centered at frequency point fH is G2. The relationship between the attenuation gain value and the current of the audio playback device corresponding to the current-limited frequency band satisfies the following formula:
[0090] (4)
[0091] In formula (4), G is the attenuation gain value, Ith is the threshold current, and I(f) is the current of the audio playback device corresponding to the current-limited frequency band. For example, the threshold current is, for instance, 2A, and the current I(f) corresponding to frequency point fL is, for instance, 3A, which is greater than the threshold current. Therefore, an attenuation gain value G1 needs to be applied to the frequency band centered at frequency point fL. The attenuation gain value is... =-9.5dB. It is understood that the frequency point fH is the band attenuation gain value G2 of the center frequency, which can be calculated by referring to the calculation method of the attenuation gain value G1. Some embodiments of this invention will not be elaborated here.
[0092] Figure 5 The image exemplarily illustrates that the limiting module 13 includes a first peak limiter 131 and a second peak limiter 132. Figure 7 This is a schematic diagram illustrating the correspondence between the input attenuation gain value and the output attenuation gain value of a first peak limiter according to an exemplary embodiment of the present invention. Figure 7 The horizontal axis represents the input signal in dB, and the vertical axis represents the output signal in dB. G0 represents the attenuation gain threshold, and G1 represents... Figure 6The maximum attenuation gain of the first peak limiter 131. Figure 7 The diagram exemplarily illustrates a mapping relationship in a first peak limiter, which operates by measuring the input attenuation gain value and, based on... Figure 7 The mapping relationship shown outputs an attenuation gain value, which is then used to attenuate the audio signal corresponding to the current-limiting band. It should be noted that the second peak limiter can be the same type of limiter as the first peak limiter, and the mapping relationship in the second peak limiter can be understood with reference to the first peak limiter. Some embodiments of this invention will not be elaborated upon here.
[0093] For example, when the current-limiting frequency band calculation module 11 calculates the attenuation gain value corresponding to the current-limiting frequency band centered at frequency point fL, and the attenuation gain value GL input to the first peak limiter 131 is, for example, -30dB and less than the attenuation gain threshold G0, for example, -20dB, then the first peak limiter 131 attenuates the audio signal corresponding to the current-limiting frequency band by -30dB. When the current-limiting frequency band calculation module 11 calculates the attenuation gain value corresponding to the current-limiting frequency band centered at frequency point fL, and the attenuation gain value input to the first peak limiter 131 is, for example, -10dB and greater than the attenuation gain threshold, for example, -20dB, then the attenuation gain value used by the first peak limiter 131 to attenuate the audio signal corresponding to the current-limiting frequency band is no longer in a 1:1 relationship with the input attenuation gain value, but rather according to... Figure 8 The curve relationship of the middle CD band is attenuated. For example, the audio signal corresponding to the current limiting band can be attenuated by -15dB, and the maximum value of the attenuation gain value cannot exceed the maximum attenuation gain threshold G1.
[0094] It is understood that the attenuation method of the second peak limiter 132 can be understood with reference to the attenuation method of the first peak limiter 131, and some embodiments of the present invention will not be described in detail.
[0095] In some embodiments, the current limiting control device is configured to attenuate the gain value of the audio signal corresponding to the current limiting frequency band, specifically including:
[0096] The gain value of the audio signal corresponding to the current-limited frequency band is gradually attenuated.
[0097] Specifically, to ensure that the audio signal does not experience hard distortion or abrupt changes during attenuation, after determining the attenuation gain value, the audio signal corresponding to the current-limiting frequency band needs to be gradually attenuated. For example, it can be attenuated at an arithmetic or geometrical rate. For instance, when it is necessary to attenuate the audio signal corresponding to the current-limiting frequency band by -10dB, it can be attenuated at a rate of -1dB per second over a preset time period, such as 10 seconds, to ensure the sound quality of the audio signal and avoid abrupt changes. It should be noted that the attenuation rate of the audio signal corresponding to the current-limiting frequency band can be set according to the actual usage requirements of the audio playback device, and some embodiments of the present invention do not limit this.
[0098] In some embodiments, the current limiting control device is configured to further include, before determining at least one current-limiting frequency band of the input audio signal:
[0099] Perform sound effects processing on the input audio signal.
[0100] Specifically, to improve the sound quality of an audio playback device, the input audio signal needs to be processed before determining at least one current-limiting frequency band. For example, in Figure 4 In the frequency point f L The frequencies in the band centered at f are generally low, resulting in poor sound production efficiency for audio playback devices. Filtering can be applied to this frequency band. For example, a high-frequency filter can be used to filter frequencies around f. L The current-limiting frequency band is filtered for the center frequency. The current-limiting frequency band calculation module only determines the frequency band with f as the center frequency. H The attenuation gain value of the current-limiting band at the center frequency reduces the computational load of the current-limiting band operation module and improves the operational efficiency of the current-limiting control device. It should be noted that other audio effect processing methods can also be applied to the audio signal, which can be implemented with reference to the above embodiments. Some embodiments of the present invention will not be elaborated upon here.
[0101] Some embodiments of the present invention attenuate the gain value of at least one current-limiting frequency band of the input audio signal, and then mix the audio signal corresponding to the attenuated current-limiting frequency band with the audio signal corresponding to the frequency band outside the current-limiting frequency band of the input audio signal to obtain the output signal. This achieves current limitation on the audio signal in the current-limiting frequency band, reduces the current consumption of the audio playback device, avoids the problem of excessive current increasing the power consumption of the audio playback device and reducing the sound quality of the audio playback device, and reduces the power consumption of the audio playback device.
[0102] In some embodiments, the present invention also provides a computer storage medium, wherein the computer storage medium may store a program, which, when executed, may include some or all of the steps of the methods provided in various embodiments of the present invention. The storage medium may be a magnetic disk, an optical disk, read-only memory (ROM), or random access memory (RAM), etc.
[0103] In some embodiments, the present invention also provides an apparatus including a processor and a memory. Figure 8 This is a schematic diagram illustrating the structure of a device according to an exemplary embodiment of the present invention. Figure 8 As shown, the device includes a processor 901 and a memory 902. The processor 901 executes the steps of the current limiting control method of the audio playback device as described in the above embodiment by calling the program or instructions stored in the memory 902. Therefore, it has the beneficial effects of the above embodiment, which will not be repeated here.
[0104] Specifically, such as Figure 8 As shown, the device can be configured to include at least one processor 901, at least one memory 902, and at least one communication interface 903. The various components within the device are coupled together via a bus system 904. The communication interface 903 is used for information transmission with external devices. It is understood that the bus system 904 is used to implement communication between these components. In addition to a data bus, the bus system 904 also includes a power bus, a control bus, and a status signal bus. However, for clarity, ... Figure 8 The general labeled all buses as Bus System 904.
[0105] It is understood that the memory 902 in this embodiment can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. In some embodiments, the memory 902 stores the following elements: executable units or data structures, or subsets thereof, or extended sets thereof, operating systems, and applications. In some embodiments of the present invention, the processor 901 executes the steps of various embodiments of the current limiting control method for the audio playback device provided in some embodiments of the present invention by calling programs or instructions stored in the memory 902.
[0106] The current limiting control method for an audio playback device provided in some embodiments of the present invention can be applied to, or implemented by, a processor 901. The processor 901 can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the hardware of the processor 901 or by instructions in software form. The processor 901 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor.
[0107] Some embodiments of the present invention provide steps that can be directly executed by a hardware decoding processor, or executed by a combination of hardware and software units within the decoding processor. The software units can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other storage media readily available in the art. This storage medium is located in memory 902, and processor 901 reads information from memory 902 and combines it with hardware to complete the steps of the method.
[0108] The device may also include one or more physical components to execute instructions generated by the processor 901 when performing the flow limiting control method for the audio playback device provided in some embodiments of the present invention. Different physical components may be located within the device or outside the device, such as a cloud server. Each physical component, together with the processor 901 and the memory 902, works to implement the functions of the device in this embodiment.
[0109] Those skilled in the art will clearly understand that the techniques in some embodiments of the present invention can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in some embodiments of the present invention, or the parts that contribute to related technologies, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or certain parts of the embodiments of the present invention.
[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
[0111] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of embodiments suitable for specific application considerations.
Claims
1. A display device, characterized in that, include: The display screen is configured to display images. An audio playback device is configured to play audio signals; The audio playback device includes a flow limiting control device and an audio playback device; The current limiting control device is configured to: determine at least one current limiting frequency band of the input audio signal, and determine the attenuation gain value of the audio signal corresponding to the current limiting frequency band based on the proportion by which the current of the audio playback device corresponding to the current limiting frequency band exceeds a threshold current; filter and acquire the audio signal corresponding to the current limiting frequency band, and filter and acquire audio signals corresponding to frequency bands outside the current limiting frequency band in the input audio signal; gradually attenuate the attenuation gain value of the audio signal corresponding to the current limiting frequency band; and mix the attenuated audio signal corresponding to the current limiting frequency band with the audio signals corresponding to frequency bands outside the current limiting frequency band in the input audio signal to obtain an output signal. The audio playback device is configured to play the output signal of the current limiting control device.
2. The display device according to claim 1, characterized in that, The audio playback device also includes: The power amplifier is configured to amplify the output signal of the current limiting control device and transmit it to the audio playback device.
3. The display device according to claim 1, characterized in that, The current limiting control device includes: The current-limiting frequency band calculation module is configured to: determine at least one current-limiting frequency band of the input audio signal and the attenuation gain value of the audio signal corresponding to the current-limiting frequency band; The filtering module is configured to: filter and acquire audio signals corresponding to the current-limiting frequency band and audio signals corresponding to frequency bands outside the current-limiting frequency band in the input audio signal; The limiting module is configured to attenuate the audio signal corresponding to the current-limiting frequency band by the attenuation gain value. The mixing module is configured to mix the attenuated audio signal corresponding to the current-limited frequency band with the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal to obtain an output signal.
4. The display device according to claim 1, characterized in that, The current limiting control device further includes an audio effect preprocessing module, configured to perform audio effect processing on the input audio signal.
5. The display device according to claim 1, characterized in that, The current limiting control device is configured to determine at least one current limiting frequency band for the input audio signal, specifically including: Based on the impedance-frequency relationship of the audio playback device and the power supply voltage, determine the relationship between the current and frequency of the audio playback device. Based on the correlation between the current and frequency of the audio playback device, the frequency band corresponding to the current of the audio playback device being greater than the threshold current is determined as the current-limiting frequency band.
6. The display device according to claim 1, characterized in that, The current limiting control device is configured to determine at least one current limiting frequency band for the input audio signal, specifically including: Based on the impedance-frequency correlation of the audio playback device, the frequency bands corresponding to the impedance of the audio playback device being less than a preset impedance value are determined as current-limiting frequency bands.
7. The display device according to any one of claims 1-6, characterized in that, The current limiting control device is configured to further include, before determining at least one current limiting frequency band of the input audio signal: The input audio signal is processed for sound effects.
8. A current limiting control method for a display device, characterized in that, include: Determine at least one current-limiting frequency band of the input audio signal and the proportion by which the current of the audio playback device corresponding to the current-limiting frequency band exceeds a threshold current, and determine the attenuation gain value of the audio signal corresponding to the current-limiting frequency band. Filter to obtain the audio signal corresponding to the current-limited frequency band, and filter to obtain the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal; The audio signal corresponding to the current-limiting frequency band is gradually attenuated by the attenuation gain value; The attenuated audio signal corresponding to the current-limited frequency band is mixed with the audio signal corresponding to the frequency band outside the current-limited frequency band in the input audio signal to obtain the output signal.