Method, device and equipment for determining DC disturbance voltage in digital-to-analog conversion system

Abstract

The present application provides a method, apparatus, and device for determining a DC disturbance voltage in a digital-to-analog conversion system, relating to the field of integrated circuit technologies. The method includes: when there is no signal input after the target digital-to-analog conversion system is powered on, obtaining the output voltage of the target digital-to-analog conversion system; determining a compensation value of the output voltage according to the output voltage; determining the minimum absolute value of the DC disturbance voltage applied by the DC disturbance voltage application controller in a plurality of digital-to-analog conversion systems; and determining the target DC disturbance voltage to be applied by the DC disturbance voltage application controller according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage. This solution can ensure that the output voltage is compensated and the application amplitude of the target DC disturbance voltage is large enough, so that when there is no signal input after the target digital-to-analog conversion system is powered on, the offset voltage in the overall output result of the target digital-to-analog conversion system is as small as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular, to a method, apparatus, and device for determining a DC disturbance voltage in a digital-to-analog conversion system. Background Art

[0002] In the audio field, in a digital-to-analog conversion system composed of a digital-to-analog converter (DAC) and a power amplifier, theoretically, when the input of valid audio data is 0, the output voltage at the output end of the power amplifier should also be as close to 0V as possible. However, in practice, there are often non-ideal factors in the digital-to-analog conversion system, resulting in the output voltage at the output end of the power amplifier not being 0V. Among them, these non-ideal factors mainly include: (1) Due to the uncertainty of the manufacturing process of each component in the circuit and the mechanical pressure after packaging, there is an inevitable offset voltage in the digital-to-analog conversion system; (2) A DC disturbance voltage is deliberately applied to the input end of the digital-to-analog converter to solve the problem of idle noise that easily occurs in the digital-to-analog converter. However, when applying the DC disturbance voltage, a new offset voltage will be introduced. The existence of the offset voltage may cause obvious noise when the digital-to-analog conversion system drives a speaker device. Therefore, it is necessary to compensate for the offset voltage caused by the above two factors.

[0003] Currently, when compensating for the offset voltage in a digital-to-analog conversion system, mainly the applied DC disturbance voltage is set to a fixed value, and then, based on the measured offset voltage existing in the digital-to-analog system and the preset DC disturbance voltage, the overall output offset voltage of the digital-to-analog conversion system is determined.

[0004] However, in the existing compensation method, if the inevitable offset voltage in the digital-to-analog conversion system is small, it will cause the offset voltage in the overall output result of the digital-to-analog conversion system to be large. Summary of the Invention

[0005] The purpose of the present invention is to provide a method, apparatus, and device for determining a DC disturbance voltage in a digital-to-analog conversion system for the deficiencies in the above-mentioned existing technologies, so as to solve the problem that when the inevitable offset voltage in the digital-to-analog conversion system is small, the offset voltage in the overall output result of the digital-to-analog conversion system is large.

[0006] To achieve the above object, the technical solutions adopted in the embodiments of the present application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a method for determining a DC disturbance voltage in a digital-to-analog conversion system, the method including:

[0008] After the target digital-to-analog conversion system is powered on and there is no signal input, collect and obtain the output voltage of the target digital-to-analog conversion system;

[0009] Determine the compensation value of the output voltage according to the output voltage;

[0010] Determine the minimum absolute value of the DC disturbance voltage applied by the DC disturbance voltage application controller in multiple digital-to-analog conversion systems;

[0011] Determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC disturbance voltage.

[0012] Optionally, the determining the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage includes:

[0013] Determine the difference between the absolute value of the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage;

[0014] If the difference is greater than or equal to zero, determine that the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system is zero.

[0015] Optionally, the method further includes:

[0016] If the difference is less than zero, determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage.

[0017] Optionally, the determining the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage includes:

[0018] Judge whether the compensation value of the output voltage is greater than or equal to zero;

[0019] If so, determine the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0020] Optionally, the method further includes:

[0021] If not, determine the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the result after taking the inverse of the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0022] Optionally, the determining the compensation value of the output voltage according to the output voltage includes:

[0023] Determine the result of taking the inverse of the output voltage to obtain the compensation value of the output voltage.

[0024] Optionally, the determining the minimum absolute value of the DC disturbance voltage applied by the DC disturbance voltage application controller in multiple digital-to-analog conversion systems includes:

[0025] Obtain the absolute values of the DC disturbance voltages applied by the DC disturbance voltage application controllers in multiple digital-to-analog conversion systems;

[0026] Determine the minimum value among the absolute values of the DC disturbance voltages applied by the DC disturbance voltage application controllers in each digital-to-analog conversion system to obtain the minimum absolute value of the DC disturbance voltage.

[0027] In a second aspect, an embodiment of the present application further provides a device for determining a DC disturbance voltage in a digital-to-analog conversion system, and the device includes:

[0028] An acquisition module, configured to acquire the output voltage of the target digital-to-analog conversion system when there is no signal input after the target digital-to-analog conversion system is powered on;

[0029] A determination module, configured to determine the compensation value of the output voltage according to the output voltage; determine the minimum absolute value of the DC disturbance voltages applied by the DC disturbance voltage application controllers in multiple digital-to-analog conversion systems; and determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC disturbance voltage.

[0030] Optionally, the determination module is further configured to:

[0031] Determine the difference between the absolute value of the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage;

[0032] If the difference is greater than or equal to zero, determine that the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system is zero.

[0033] Optionally, the determining module is further configured to:

[0034] If the difference is less than zero, determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage.

[0035] Optionally, the determining module is further configured to:

[0036] Determine whether the compensation value of the output voltage is greater than or equal to zero;

[0037] If so, determine the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0038] Optionally, the determining module is further configured to:

[0039] If not, determine the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the result of taking the inverse of the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0040] Optionally, the determining module is further configured to:

[0041] Determine the inverted result of the output voltage to obtain the compensation value of the output voltage.

[0042] Optionally, the determining module is further configured to:

[0043] Obtain the absolute values of the DC disturbance voltages applied by the DC disturbance voltage application controllers in multiple digital-to-analog conversion systems;

[0044] Determine the minimum value among the absolute values of the DC disturbance voltages applied by the DC disturbance voltage application controllers in each digital-to-analog conversion system to obtain the minimum absolute value of the DC disturbance voltage.

[0045] In a third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a storage medium, and a bus. The storage medium stores machine-readable instructions executable by the processor. When the electronic device runs, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the method provided in the first aspect.

[0046] Fourthly, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, it executes the steps of the method provided in the first aspect.

[0047] The beneficial effects of the present application are as follows:

[0048] An embodiment of the present application provides a method, device, and equipment for determining a DC disturbance voltage in a digital-to-analog conversion system. The method includes: when there is no signal input after the target digital-to-analog conversion system is powered on, collecting and obtaining the output voltage of the target digital-to-analog conversion system; determining the compensation value of the output voltage according to the output voltage; determining the absolute minimum value of the DC disturbance voltage applied by the DC disturbance voltage application controller in multiple digital-to-analog conversion systems; and determining the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the absolute minimum value of the DC disturbance voltage, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC disturbance voltage. This solution mainly comprehensively considers the compensation value of the output voltage when there is no signal input after the target digital-to-analog conversion system is powered on and the absolute minimum value of the DC disturbance voltage, and calculates a reasonable target DC disturbance voltage. In this way, while ensuring that the output voltage is compensated and the application amplitude of the target DC disturbance voltage is large enough, the offset voltage in the overall output result of the target digital-to-analog conversion system is as small as possible when there is no signal input after the target digital-to-analog conversion system is powered on. Description of the Drawings

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1 It is a schematic structural diagram of a digital-to-analog conversion system provided by an embodiment of the present application;

[0051] Figure 2 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

[0052] Figure 3 It is a schematic flow diagram of a method for determining a DC disturbance voltage in a digital-to-analog conversion system provided by an embodiment of the present application;

[0053] Figure 4Schematic flowchart of another method for determining DC disturbance voltage in the digital-to-analog conversion system provided by an embodiment of the present application;

[0054] Figure 5 Schematic flowchart of yet another method for determining DC disturbance voltage in the digital-to-analog conversion system provided by an embodiment of the present application;

[0055] Figure 6 Schematic flowchart of another method for determining DC disturbance voltage in the digital-to-analog conversion system provided by an embodiment of the present application;

[0056] Figure 7 Schematic structural diagram of a device for determining DC disturbance voltage in a digital-to-analog conversion system provided by an embodiment of the present application.

[0057] Icons: 100 - Digital-to-analog conversion system; 101 - Offset voltage compensation controller; 102 - DC disturbance voltage application controller; 103 - Digital-to-analog converter; 104 - Power amplifier. Detailed implementation manners

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the accompanying drawings in the present application are only for the purposes of illustration and description, and are not used to limit the protection scope of the present application. Additionally, it should be understood that the schematic drawings are not drawn to actual scale. The flowcharts used in the present application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without logical context relationships may be reversed or implemented simultaneously. In addition, those skilled in the art may add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present application.

[0059] In addition, the described embodiments are only some embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts fall within the protection scope of the present application.

[0060] It should be noted that the term "including" will be used in the embodiments of the present application to indicate the existence of the subsequently stated features, but does not exclude the addition of other features.

[0061] The following methods, devices, electronic devices, or computer-readable storage media according to the embodiments of the present application can be applied to any scenario that requires evaluating the DC disturbance voltage in a digital-to-analog conversion system. The embodiments of the present application do not limit the specific application scenarios. Any solution that uses the method, device, electronic device, and storage medium for determining the DC disturbance voltage in the digital-to-analog conversion system provided by the embodiments of the present application is within the protection scope of the present application.

[0062] First, before specifically describing the technical solutions provided by the present application, a brief description of the relevant background involved in the present application is given.

[0063] Currently, when compensating for the offset voltage in a digital-to-analog conversion system, the DC disturbance voltage is mainly set to a fixed value. Then, based on the measured offset voltage in the digital-to-analog system and the preset DC disturbance voltage, the overall offset voltage output by the digital-to-analog conversion system is determined.

[0064] However, in the existing compensation methods, if the inevitable offset voltage in the digital-to-analog conversion system is small, it will cause the offset voltage in the overall output result of the digital-to-analog conversion system to be large.

[0065] To solve the above technical problems existing in the prior art, the present application proposes a method for determining the DC disturbance voltage in a digital-to-analog conversion system. First, the output voltage of the target digital-to-analog conversion system when there is no signal input after the target digital-to-analog conversion system is powered on (i.e., if there is an inevitable offset voltage in the digital-to-analog conversion system) is obtained. Then, based on the absolute value minimum of the DC disturbance voltages applied by the DC disturbance voltage application controllers in multiple digital-to-analog conversion systems and the compensation value of the output voltage of the target digital-to-analog conversion system when there is no signal input after being powered on, the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system is calculated. This solution mainly comprehensively considers the compensation value of the output voltage of the target digital-to-analog conversion system when there is no signal input after being powered on and the absolute value minimum of the DC disturbance voltage, and calculates a reasonable target DC disturbance voltage. In this way, while ensuring that the output voltage is compensated and the application amplitude of the target DC disturbance voltage is large enough, the offset voltage in the overall output result of the digital-to-analog conversion system is made as small as possible when the target digital-to-analog conversion system has no signal input after being powered on.

[0066] In addition, the reduction of the offset voltage in the overall output result of the digital-to-analog conversion system can also reduce the power consumption of the digital-to-analog conversion system, ensure that the effective mechanical vibration range of the speaker driven by the digital-to-analog conversion system is in the optimal interval, and thus achieve the effect of improving the user experience.

[0067] The following briefly describes the structural schematic diagram of the digital-to-analog conversion system provided by this application through multiple embodiments.

[0068] Figure 1 It is the structural schematic diagram of the digital-to-analog conversion system provided by the embodiment of this application; as Figure 1 shown, the digital-to-analog conversion system 100 includes: an offset voltage compensation controller 101, a DC perturbation voltage application controller 102, a digital-to-analog converter 103, and a power amplifier 104.

[0069] Among them, the input end of the digital-to-analog conversion system 100 is used to access the audio signal SDig. The input end of the digital-to-analog converter 103 is connected to the output end of the offset voltage compensation controller 101 and the output end of the DC perturbation voltage application controller 102. The output end of the digital-to-analog converter 103 is connected to the input end of the power amplifier 104.

[0070] It should be understood that due to the inevitable offset voltage in the digital-to-analog conversion system, in the case of no digital signal input, that is, SDAC_i = 0, at the moment when the digital-to-analog conversion system 100 is powered on, the output voltage Sout of the digital-to-analog conversion system will also have a voltage jump. This voltage jump will cause the speaker driven by the digital-to-analog conversion system 100 to generate a POP sound, which is a harmful component and needs to be compensated and eliminated. Therefore, the inevitable offset voltage can be compensated by the offset voltage compensation controller 101 in the above Figure 1 . Specifically: The output voltage of the digital-to-analog conversion system 100 without signal input is tested by an instrument, and then a compensation signal opposite to the output voltage is applied in the offset voltage compensation controller 101 to eliminate the voltage mutation after power-on.

[0071] At the same time, if the effective input signal Sdac_i in the digital-to-analog conversion system 100 is relatively small, a lot of idle noise will be generated in the frequency band, which will affect the signal-to-noise ratio at this time. Therefore, the idle noise in the digital-to-analog conversion system 100 can be effectively suppressed by the DC perturbation voltage application controller 102 in the above Figure 1 . Among them, the DC perturbation voltage applied by the DC perturbation voltage application controller 102 must be large enough to effectively suppress the idle noise. The sign of the applied DC perturbation voltage is irrelevant, and only the absolute value of the DC perturbation voltage needs to be greater than a certain amplitude.

[0072] The digital-to-analog converter 103 is used to convert the digital signal in the digital-to-analog conversion system 100 into an analog signal and output the converted analog signal to the power amplifier 104.

[0073] A power amplifier 104 is used to amplify the analog signal output from the output terminal of the digital-to-analog converter 103 to obtain an amplified signal. The output terminal of the power amplifier 104 outputs the amplified signal and drives the speaker based on the amplified signal.

[0074] It can be understood that Figure 1 The structure shown is only schematic. The digital-to-analog conversion system 100 may also include more or fewer components than those Figure 1 shown, or have a different configuration from that Figure 1 shown. Figure 1 Each component shown can be implemented by hardware, software, or a combination thereof.

[0075] In addition, each module in the digital-to-analog conversion system 100 can also be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0076] Figure 2 FIG. is a schematic structural diagram of an electronic device provided by an embodiment of the present application; the electronic device can be a processing device such as a computer or a server, etc., for implementing the method for determining the DC disturbance voltage in the digital-to-analog conversion system provided by the present application.

[0077] As Figure 2 shown, the electronic device 200 includes a memory 201 and a processor 202. Among them, the memory 201 and the processor 202 are directly or indirectly electrically connected to each other to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines.

[0078] The memory 201 stores software function modules stored in the memory 201 in the form of software or firmware. The processor 202 executes various functional applications and data processing by running the software programs and modules stored in the memory 201, that is, implements the method for determining the DC disturbance voltage in the digital-to-analog conversion system in the embodiment of the present application.

[0079] Among them, the memory 201 can be, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), etc. The memory 201 is used to store programs, and the processor 202 executes the programs after receiving execution instructions.

[0080] The processor 202 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 202 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.

[0081] The implementation principle and corresponding beneficial effects of the steps of the method for determining the DC disturbance voltage in the digital-to-analog conversion system provided in this application will be described below through multiple specific embodiments.

[0082] Figure 3 It is a schematic flowchart of a method for determining the DC disturbance voltage in a digital-to-analog conversion system provided in an embodiment of this application; optionally, the execution subject of this method may be the Figure 2 electronic device shown.

[0083] It should be understood that in other embodiments, the order of some steps of the method for determining the DC disturbance voltage in the digital-to-analog conversion system may be interchanged according to actual needs, or some of the steps may also be omitted or deleted. As Figure 3 shown, this method includes:

[0084] S301. When there is no signal input after the target digital-to-analog conversion system is powered on, collect and obtain the output voltage of the target digital-to-analog conversion system.

[0085] Optionally, as Figure 1 shown, when there is no signal input after the target digital-to-analog conversion system is powered on, that is, Sdac_i = 0, a voltage measuring instrument can be used to measure the output voltage of the target digital-to-analog conversion system. For example, when there is no signal input after the target digital-to-analog conversion system is powered on, the output voltage of the digital-to-analog conversion system is 4 mV, and the electronic device can obtain the collected measurement result through the output port of the voltage measuring instrument.

[0086] S302. Determine the compensation value of the output voltage according to the output voltage.

[0087] Optionally, a compensation signal opposite to the output voltage may be used as the compensation value of the output voltage.

[0088] S303. Determine the absolute minimum value of the DC disturbance voltage applied by the DC disturbance voltage application controllers in multiple digital-to-analog conversion systems.

[0089] It should be noted that the models of multiple digital-to-analog conversion systems are the same as that of the target digital-to-analog conversion system. For example, for a Σ-Δ type digital-to-analog conversion system with a resolution of 24 bits and a full-scale output of 0 dBV (2.828 Vpp), the compensation value of the output voltage of this digital-to-analog conversion system can be between [-4 mV, 4 mV].

[0090] In this embodiment, the absolute value of the DC perturbation voltage applied by the DC perturbation voltage application controller in each digital-to-analog conversion system can be measured and obtained respectively, and then the minimum value among the absolute values of the DC perturbation voltages in these multiple digital-to-analog conversion systems is used as the minimum value of the absolute value of the DC perturbation voltage. For example, according to multiple test data, the minimum value VDith_thrd of the absolute value of the DC perturbation voltage applied to the input of the DC perturbation voltage application controller in this type of digital-to-analog conversion system is determined to be 2.5 V.

[0091] S304. Determine the target DC perturbation voltage to be applied by the DC perturbation voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum value of the absolute value of the DC perturbation voltage, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC perturbation voltage.

[0092] Continue to refer to Figure 1 As shown, without considering the artificially applied DC perturbation voltage, in an ideal situation, there is the following formula (1):

[0093] Voff + VDcDac + VDcDri = 0 V (1)

[0094] Wherein, Voff is the compensation value of the output voltage, VDcDac is the output offset voltage of the digital-to-analog converter when its input is 0, and VDcDir is the output offset voltage of the power amplifier when its input is 0.

[0095] In this embodiment, mainly the already applied compensation value of the output voltage is used as a part of the DC perturbation voltage, and the target DC perturbation voltage to be applied by the DC perturbation voltage application controller in the target digital-to-analog conversion system is determined according to the compensation value of the output voltage and the minimum value of the absolute value of the DC perturbation voltage. In this way, while ensuring that the output voltage is compensated and the amplitude of the applied DC perturbation voltage is sufficient, a reasonable DC perturbation voltage can be ensured, so as to achieve the effect that the offset voltage included in the final output VDCout of the target digital-to-analog conversion system is minimized when there is no signal input after power-on.

[0096] In this way, in the target digital-to-analog conversion system, instead of using a DC perturbation voltage with a fixed value, the target DC perturbation voltage is recalculated based on the compensation value of the output voltage and the minimum absolute value of the DC perturbation voltage, so that the output voltage is compensated, and at the same time, the DC perturbation voltage is not excessively applied. That is, when the output voltage is compensated and the applied amplitude of the DC perturbation voltage meets the minimum amplitude requirement, in the case where there is no signal input after the target digital-to-analog conversion system is powered on, the offset voltage included in the final output result of the target digital-to-analog conversion system is small.

[0097] In summary, the embodiment of the present application provides a method for determining a DC perturbation voltage in a digital-to-analog conversion system. The method includes: when there is no signal input after the target digital-to-analog conversion system is powered on, acquiring the output voltage of the target digital-to-analog conversion system; determining the compensation value of the output voltage according to the output voltage; determining the minimum absolute value of the DC perturbation voltages applied by the DC perturbation voltage application controllers in multiple digital-to-analog conversion systems; and determining the target DC perturbation voltage to be applied by the DC perturbation voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC perturbation voltage, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC perturbation voltage. This solution mainly comprehensively considers the compensation value of the output voltage when there is no signal input after the target digital-to-analog conversion system is powered on and the minimum absolute value of the DC perturbation voltage, and calculates a reasonable target DC perturbation voltage. In this way, when the output voltage is compensated and the applied amplitude of the target DC perturbation voltage is large enough, in the case where there is no signal input after the target digital-to-analog conversion system is powered on, the offset voltage in the overall output result of the target digital-to-analog conversion system can be made as small as possible.

[0098] The following embodiments will specifically explain how to determine the target DC perturbation voltage to be applied by the DC perturbation voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC perturbation voltage in step S304 above.

[0099] Optionally, as shown in Figure 4 above, step S304 includes:

[0100] S401. Determine the difference between the absolute value of the compensation value of the output voltage and the minimum absolute value of the DC perturbation voltage.

[0101] S402. If the difference is greater than or equal to zero, determine that the target DC perturbation voltage to be applied by the DC perturbation voltage application controller in the digital-to-analog conversion system is zero.

[0102] Wherein, the compensation value of the output voltage is denoted as Voff, the absolute value of the compensation value of the output voltage is denoted as |Voff|, and the minimum absolute value of the DC disturbance voltage is denoted as VDith_thrd.

[0103] In this embodiment, the difference between the absolute value |Voff| of the compensation value of the output voltage and the minimum absolute value VDith_thrd of the DC disturbance voltage can be calculated, that is, Δ = |Voff| - VDith_thrd. Then, based on the calculated difference, the target DC disturbance voltage DC Dither can be further determined.

[0104] In an implementable manner, if Δ = |Voff| - VDith_thrd is greater than or equal to zero, that is, the absolute value of the compensation value of the output voltage is greater than or equal to the minimum absolute value of the DC disturbance voltage, it can be determined that no DC disturbance voltage needs to be applied, that is, the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the digital-to-analog conversion system is zero. In this way, only by the compensation value of the output voltage applied by the offset voltage compensation controller, it is possible to ensure that the output voltage is compensated while the applied amplitude of the target DC disturbance voltage is large enough, so that when there is no signal input after the target digital-to-analog conversion system is powered on, the offset voltage in the overall output result of the target digital-to-analog conversion system is as small as possible.

[0105] Optionally, the method further includes: if the difference is less than zero, then based on the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage, determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system.

[0106] In another implementable manner, if Δ = |Voff| - VDith_thrd is less than zero, it can be determined that only by the compensation value of the output voltage applied by the offset voltage compensation controller, it is impossible to ensure that the output voltage is compensated while the applied amplitude of the target DC disturbance voltage meets the minimum amplitude requirement. Therefore, it is also necessary to determine a reasonable target DC disturbance voltage based on the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage.

[0107] The following embodiments will specifically illustrate how to determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system based on the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage when the difference is less than zero.

[0108] Optionally, refer to Figure 5As shown, the above steps determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system based on the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage, including:

[0109] S501. Determine whether the compensation value of the output voltage is greater than or equal to zero.

[0110] S502. If so, determine the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0111] In this embodiment, it is determined whether the compensation value Voff of the output voltage is greater than or equal to 0. If so, the target DC disturbance voltage is VDither = VDith_thrd - Voff, that is, the compensation value of the already applied output voltage is used as part of the DC disturbance voltage to calculate a reasonable target DC disturbance voltage. In this way, it is avoided that the DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system is too large, and when the inevitable offset voltage in the digital-to-analog conversion system is small, the problem that the offset voltage in the overall output result of the target digital-to-analog conversion system is too large.

[0112] Optionally, the method further includes: if not, determine the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the result of taking the inverse of the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0113] In this embodiment, if the compensation value Voff of the output voltage is less than 0, calculate the sum VDith_thrd + Voff of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the result of taking the inverse of the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage, that is, the target DC disturbance voltage is VDither = -(VDith_thrd + Voff).

[0114] In order to verify the effectiveness of the above method, the following embodiments are listed in Table 1 below and analyzed and compared directly in the form of voltage.

[0115]

[0116] Among them, VDither_total in Table 1 is the total DC disturbance voltage finally input to the digital-to-analog conversion system, and the output offset voltage of the Driver in Table 1 is the offset voltage in the output result of the digital-to-analog conversion system.

[0117] It should be understood that forFigure 1 The digital-to-analog conversion system shown, where when both the compensation value Voff of the output voltage and the DC perturbation voltage VDither exist simultaneously, the total DC perturbation voltage finally input to the digital-to-analog conversion system is VDither_total = Voff + VDither.

[0118] By observing and analyzing Table 1, it can be seen that when the minimum absolute value of the DC perturbation voltage is 2.5 mV, if the absolute value |Voff| of the compensation value of the output voltage is greater than the minimum absolute value VDith_thrd of the DC perturbation voltage, that is, in the first row of Table 1 |-4| > 2.5 mV, then the target DC perturbation voltage VDither to be applied is 0, that is, there is no need to re-apply the DC perturbation voltage.

[0119] If the absolute value |Voff| of the compensation value of the output voltage is less than the minimum absolute value VDith_thrd of the DC perturbation voltage, that is, in the second row of Table 1 |-1.5| < 2.5 mV (or the fourth row |1.5| < 2.5 mV), then it is judged whether the compensation value of the output voltage is greater than 0; if the compensation value Voff of the output voltage is less than 0, that is, as shown in the second row -1.5 < 0, then VDither = -(VDith_thrd + Voff) = -(2.5 - 1.5) = -1 mV; if the compensation value Voff of the output voltage is greater than or equal to 0, that is, as shown in the fourth row 1.5 > 0, then VDither = VDith_thrd - Voff = 2.5 - 1.5 = 1 mV.

[0120] In addition, by observing and analyzing Table 1, it can be seen that the offset voltage in the output result of the digital-to-analog conversion system is the same as the finally determined target DC perturbation voltage. It can be seen from Table 1 that when the output voltage when the digital-to-analog conversion system is powered on without signal input is compensated and the target DC perturbation voltage to be applied meets the minimum amplitude requirement, the offset voltage in the output result of the digital-to-analog conversion system can be ensured to be small.

[0121] The following embodiments will specifically explain how to determine the compensation value of the output voltage according to the output voltage.

[0122] Optionally, determine the inverted result of the output voltage to obtain the compensation value of the output voltage.

[0123] In this embodiment, the output voltage of the digital-to-analog conversion system measured above when there is no signal input after power-on is inverted, and the inverted result is used as the compensation value of the output voltage. For example, if the output voltage of the digital-to-analog conversion system is 4 mV when there is no signal input after power-on, the compensation value of the output voltage is -4 mV; then, a signal with the compensation value of an output voltage is applied in the offset voltage compensation controller to eliminate the inevitable offset voltage existing in the digital-to-analog conversion system.

[0124] The following embodiments will specifically explain how to determine the absolute minimum value of the DC perturbation voltage applied by the DC perturbation voltage application controller in the multiple digital-to-analog conversion systems in step S303 above.

[0125] Optionally, referring to Figure 6 as shown, step S303 includes:

[0126] S601. Obtain the absolute values of the DC perturbation voltages applied by the DC perturbation voltage application controllers in the multiple digital-to-analog conversion systems.

[0127] S602. Determine the minimum value among the absolute values of the DC perturbation voltages applied by the DC perturbation voltage application controllers in each digital-to-analog conversion system to obtain the absolute minimum value of the DC perturbation voltage.

[0128] In this embodiment, a voltage measuring instrument is used to measure the absolute values of the DC perturbation voltages applied by the DC perturbation voltage application controllers in multiple digital-to-analog conversion systems of the same model, and the absolute values of the DC perturbation voltages applied by the DC perturbation voltage application controllers in each digital-to-analog conversion system are analyzed and compared, and the smallest one among the absolute values of the DC perturbation voltages found in the multiple digital-to-analog conversion systems is used as the absolute minimum value of the DC perturbation voltage.

[0129] Based on the same inventive concept, an apparatus for determining the DC perturbation voltage in a digital-to-analog conversion system corresponding to the method for determining the DC perturbation voltage in a digital-to-analog conversion system is further provided in the embodiments of the present application. Since the principle of solving problems by the apparatus in the embodiments of the present application is similar to the method for determining the DC perturbation voltage in the digital-to-analog conversion system in the embodiments of the present application above, the implementation of the apparatus can refer to the implementation of the method, and the repeated parts will not be described again.

[0130] Referring to Figure 7 as shown, the apparatus includes:

[0131] An acquisition module 701, configured to collect and obtain the output voltage of the target digital-to-analog conversion system when there is no signal input after the target digital-to-analog conversion system is powered on;

[0132] A determination module 702 is configured to determine a compensation value of the output voltage according to the output voltage; determine the minimum absolute value of the DC disturbance voltage applied by the DC disturbance voltage application controller in a plurality of digital-to-analog conversion systems; and determine a target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC disturbance voltage.

[0133] Optionally, the determination module 702 is further configured to:

[0134] Determine the difference between the absolute value of the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage;

[0135] If the difference is greater than or equal to zero, determine that the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system is zero.

[0136] Optionally, the determination module 702 is further configured to:

[0137] If the difference is less than zero, determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage.

[0138] Optionally, the determination module 702 is further configured to:

[0139] Judge whether the compensation value of the output voltage is greater than or equal to zero;

[0140] If so, determine the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the difference between the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0141] Optionally, the determination module 702 is further configured to:

[0142] If not, determine the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage, and use the result of taking the inverse of the sum of the minimum absolute value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

[0143] Optionally, the determination module 702 is further configured to:

[0144] Determine the inverted result of the output voltage to obtain the compensation value of the output voltage.

[0145] Optionally, the determination module is further configured to:

[0146] Obtain the absolute value of the DC perturbation voltage applied by the DC perturbation voltage application controller in multiple digital-to-analog conversion systems;

[0147] Determine the minimum value among the absolute values of the DC perturbation voltages applied by the DC perturbation voltage application controllers in each digital-to-analog conversion system, and obtain the minimum absolute value of the DC perturbation voltage.

[0148] The above device is used to execute the method provided in the foregoing embodiment, and its implementation principle and technical effects are similar, and will not be elaborated here.

[0149] The above modules can be one or more integrated circuits configured to implement the above method. For example: one or more application specific integrated circuits (ASICs), or, one or more digital signal processors (DSPs), or, one or more field programmable gate arrays (FPGAs), etc. Again, when a certain above module is implemented in the form of a processing element scheduling program code, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program code. Again, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0150] Optionally, the present invention further provides a program product, such as a computer-readable storage medium, including a program that is used to execute the above method embodiment when executed by a processor.

[0151] In several embodiments provided by the present invention, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0152] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0153] In addition, each functional unit in various embodiments of the present invention may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of a combination of hardware and software functional units.

[0154] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit stored in a storage medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute some steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: USB flash drives, mobile hard disks, read-only memories (English: Read-Only Memory, abbreviated as: ROM), random access memories (English: Random Access Memory, abbreviated as: RAM), magnetic disks, or optical discs and other various media that can store program codes.

Claims

1. A method for determining the DC disturbance voltage in a digital-to-analog conversion system, characterized in that, the method includes: When there is no signal input after the target digital-to-analog conversion system is powered on, collect and obtain the output voltage of the target digital-to-analog conversion system; According to the output voltage, determine the compensation value of the output voltage; Determine the absolute minimum value of the DC disturbance voltage applied by the DC disturbance voltage application controller in multiple digital-to-analog conversion systems; According to the compensation value of the output voltage and the absolute minimum value of the DC disturbance voltage, determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC disturbance voltage; Wherein, the determining the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the absolute minimum value of the DC disturbance voltage includes: Determine the difference between the absolute value of the compensation value of the output voltage and the absolute minimum value of the DC disturbance voltage; If the difference is greater than or equal to zero, determine that the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system is zero.

2. The method according to claim 1, characterized in that, the method further includes: If the difference is less than zero, determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the absolute minimum value of the DC disturbance voltage.

3. The method according to claim 2, characterized in that, the determining the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the absolute minimum value of the DC disturbance voltage includes: Judge whether the compensation value of the output voltage is greater than or equal to zero; If so, determine the difference between the absolute minimum value of the DC disturbance voltage and the compensation value of the output voltage, and use the difference between the absolute minimum value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

4. The method according to claim 3, characterized in that, the method further includes: If not, determine the sum of the absolute minimum value of the DC disturbance voltage and the compensation value of the output voltage, and use the result after taking the inverse of the sum of the absolute minimum value of the DC disturbance voltage and the compensation value of the output voltage as the target DC disturbance voltage.

5. The method according to claim 1, characterized in that, the determining the compensation value of the output voltage according to the output voltage includes: Determine the inverted result of the output voltage to obtain the compensation value of the output voltage.

6. The method according to any one of claims 1-5, characterized in that, the determining the absolute minimum value of the DC disturbance voltage applied by the DC disturbance voltage application controller in multiple digital-to-analog conversion systems includes: Obtain the absolute value of the DC disturbance voltage applied by the DC disturbance voltage application controller in multiple said digital-to-analog conversion systems; Determine the minimum value among the absolute values of the DC disturbance voltages applied by the DC disturbance voltage application controllers in each of the said digital-to-analog conversion systems, and obtain the minimum absolute value of the DC disturbance voltage.

7. A device for determining DC disturbance voltage in a digital-to-analog conversion system, characterized in that, the device includes: An acquisition module, configured to acquire the output voltage of the target digital-to-analog conversion system when there is no signal input after the target digital-to-analog conversion system is powered on; A determination module, configured to determine the compensation value of the output voltage according to the output voltage; determine the minimum absolute value of the DC disturbance voltages applied by the DC disturbance voltage application controllers in multiple digital-to-analog conversion systems; and determine the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system according to the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage, so that the target digital-to-analog conversion system eliminates the idle noise generated by the digital-to-analog conversion unit based on the target DC disturbance voltage; The determination module is further configured to: Determine the difference between the absolute value of the compensation value of the output voltage and the minimum absolute value of the DC disturbance voltage; If the difference is greater than or equal to zero, determine that the target DC disturbance voltage to be applied by the DC disturbance voltage application controller in the target digital-to-analog conversion system is zero.

8. An electronic device, characterized in that, it includes: A processor, a storage medium and a bus, the storage medium stores machine-readable instructions executable by the processor. When the electronic device runs, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the method according to any one of claims 1-6.

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