Switching control method for audio signals and related apparatus

Abstract

The application relates to a switching control method of an audio signal and a related device thereof, which is applied to an audio input system including at least two SPDIF input channels, and comprises the following steps: receiving a first audio signal input through an SPDIF input channel to obtain a plurality of candidate audio signals; inputting the candidate audio signals into a first switching unit of the corresponding SPDIF input channel respectively, and determining at least one second audio signal from the candidate audio signals through the first switching unit; determining a target input channel from the SPDIF input channels based on a preset switching control strategy and a signal state parameter of the SPDIF input channel; and outputting a target audio signal corresponding to the target input channel to a target receiver. The scheme provided by the application can avoid the influence of large channel crosstalk in the multi-channel SPDIF channel switching mode, and improves the stability of the audio signal.

Description

Technical Field

[0001] This application relates to the field of audio and video signal processing technology, and in particular to an audio signal switching control method and related apparatus. Background Technology

[0002] In modern audio equipment, with the continuous development of multimedia technology, users often need to connect multiple digital audio sources simultaneously, such as the HDMI ARC interface of a TV, optical audio output devices, and coaxial audio interfaces. These devices typically provide SPDIF format digital audio signals, but most audio SoCs or digital audio processors are only equipped with a single SPDIF receiver interface, so they generally need to be equipped with the function of selecting and switching multiple digital audio signals.

[0003] However, the signal quality of the SPDIF transmission channel is easily affected by edge characteristics, impedance matching, and clock jitter. In particular, when multiple input signals exist simultaneously, due to insufficient isolation between channels, unselected signals can interfere with selected signals through parasitic capacitance and resistance inside the device, resulting in crosstalk. This leads to increased audio signal noise floor, deteriorated edge quality, and unstable phase-locked loop. Furthermore, additional parasitic capacitance and propagation delay are introduced during signal switching, resulting in a significant increase in SPDIF signal clock jitter. Consequently, poor audio signal quality, signal jitter, and problems such as popping and noise occur. Summary of the Invention

[0004] To address or partially address the problems existing in related technologies, this application provides an audio signal switching control method and related apparatus. By processing multiple SPDIF input audio signals separately, using an independent switching unit for each input channel to filter candidate signals, and determining the target channel to output the audio signal based on the switching control strategy and channel signal status, this method can reduce signal interference from unselected channels to the target channel, avoid the effects of large channel crosstalk and severe clock jitter in multi-channel SPDIF channel switching, and improve the stability and quality of the audio signal.

[0005] The first aspect of this application provides an audio signal switching control method applied to an audio input system including at least two SPDIF input channels. The method includes: receiving a first audio signal input through the SPDIF input channels and preprocessing the first audio signal to obtain a plurality of candidate audio signals; inputting the candidate audio signals to a first switching unit corresponding to the SPDIF input channel, and determining at least one second audio signal from the candidate audio signals through the first switching unit; determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and signal state parameters of the SPDIF input channels; and outputting the target audio signal corresponding to the target input channel to a target receiver.

[0006] In conjunction with the first aspect, in one possible implementation of the first aspect, the preprocessing of the first audio signal to obtain a plurality of candidate audio signals includes: performing input shaping processing and level adaptation processing on the original waveform of each of the first audio signals to obtain a plurality of the candidate audio signals; wherein, the input shaping processing is used to adjust the signal edge quality of the first audio signal, and the level adaptation processing is used to adjust the level of the first audio signal.

[0007] In conjunction with the first aspect, in one possible implementation of the first aspect, the SPDIF input channel includes at least two of the following: an input channel accessed via an HDMI ARC interface, an input channel accessed via an optical fiber SPDIF interface, and an input channel accessed via a coaxial SPDIF interface.

[0008] In conjunction with the first aspect, in one possible implementation of the first aspect, the first switching unit includes a first state and a second state, and the step of determining at least one second audio signal from the candidate audio signals through the first switching unit includes: in response to a target control signal, controlling the first switching unit corresponding to the target candidate channel to be in the first state, and determining the candidate audio signal corresponding to the target candidate channel as the second audio signal; controlling the first switching unit corresponding to a non-target candidate channel to be in the second state, so that the non-target candidate channel does not output an audio signal; wherein, the second state includes at least one of a shutdown state, a grounded state, and a pull-down state.

[0009] In conjunction with the first aspect, in one possible implementation of the first aspect, controlling the first switching unit corresponding to the non-target candidate channel to be in a second state includes: controlling the first switching unit to set the output node corresponding to the non-target candidate channel to a preset reference potential; wherein the preset reference potential is a ground potential or a preset invalid potential; or, controlling the first switching unit to set the output node corresponding to the non-target candidate channel to a pull-down state.

[0010] In conjunction with the first aspect, in one possible implementation of the first aspect, determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and the signal state parameters of the SPDIF input channels includes: acquiring the signal state parameters of the SPDIF input channels, wherein the signal state parameters include at least one of carrier state parameters, lock state parameters, valid data state parameters, and active state parameters; filtering at least one candidate input channel that meets preset input conditions from the SPDIF input channels based on the signal state parameters of the SPDIF input channels; sorting the candidate input channels based on the preset switching control strategy, and determining the candidate input channel with the highest priority among the sorted candidate input channels as the target input channel.

[0011] In conjunction with the first aspect, in one possible implementation of the first aspect, obtaining the signal state parameters of the SPDIF input channel includes: detecting whether there is a valid carrier in the SPDIF input channel; if so, generating carrier state information corresponding to the SPDIF input channel; detecting whether the receiving link corresponding to the SPDIF input channel meets a preset locking condition; if so, generating locking state information corresponding to the SPDIF input channel; detecting whether there is a valid audio frame in the audio signal in the SPDIF input channel; if so, generating valid state information corresponding to the SPDIF input channel; and generating signal state parameters for each SPDIF input channel based on the carrier state information, the locking state information, and the valid audio data state information.

[0012] In conjunction with the first aspect, in one possible implementation of the first aspect, determining the candidate input channel with the highest priority among the sorted candidate input channels as the target input channel includes: determining whether the rate of change of the signal state parameter of the candidate input channel with the highest priority within a first preset time period is less than a preset rate of change threshold; if it is less, then determining the candidate input channel with the highest priority as the target input channel; if it is greater, then re-sorting the candidate input channels based on the switching control strategy.

[0013] In conjunction with the first aspect, in one possible implementation of the first aspect, the SPDIF input channel further includes a second switching unit, which, before outputting the target audio signal corresponding to the target input channel to the target receiver, includes: controlling the first switching unit of the current output channel of the audio input system to be in a closed state; after a second preset time, controlling the first switching unit and the second switching unit of the target input channel to be in an open state, and controlling the second switching units of other SPDIF input channels to be in a closed state.

[0014] In conjunction with the first aspect, in one possible implementation of the first aspect, both the first switching unit and the second switching unit are clock buffers; wherein the root mean square of the period jitter of the first switching unit and the second switching unit is no greater than 5 picoseconds, and the peak-to-peak jitter is no greater than 30 picoseconds.

[0015] In conjunction with the first aspect, one possible implementation of the first aspect further includes: determining whether the SPDIF input channel has an abnormal input state; if the SPDIF input channel has the abnormal input state, then closing the SPDIF input channel with the abnormal input state.

[0016] A second aspect of this application provides an audio signal switching control device applied to an audio input system including at least two SPDIF input channels. The device includes: a receiving module for receiving a first audio signal input through the SPDIF input channels and preprocessing the first audio signal to obtain a plurality of candidate audio signals; a determining module for inputting the candidate audio signals to a first switching unit corresponding to the SPDIF input channel, and determining at least one second audio signal from the candidate audio signals through the first switching unit; a processing module for determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and signal state parameters of the SPDIF input channels; and an output module for outputting the target audio signal corresponding to the target input channel to a target receiver.

[0017] A third aspect of this application provides an electronic device, comprising: Processor; and A memory that stores executable code, which, when executed by the processor, causes the processor to perform the method described above.

[0018] A fourth aspect of this application provides a computer-readable storage medium having executable code stored thereon, which, when executed by a processor of an electronic device, causes the processor to perform the method described above.

[0019] The technical solution provided in this application may include the following beneficial effects: This application discloses an audio signal switching control method and related apparatus. The method is applied to an audio input system including at least two SPDIF input channels, comprising: receiving a first audio signal input through an SPDIF input channel and preprocessing the first audio signal to obtain a plurality of candidate audio signals; inputting the candidate audio signals to a first switching unit of the corresponding SPDIF input channel respectively, and determining at least one second audio signal from the candidate audio signals through the first switching unit; determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and signal state parameters of the SPDIF input channel; and outputting the target audio signal corresponding to the target input channel to a target receiver. In this method, by processing multiple SPDIF input audio signals separately, using an independent switching unit for each input channel to filter candidate signals, and determining the target channel to output the audio signal according to the switching control strategy and channel signal state, the signal interference of other channels to the target channel can be reduced, avoiding the effects of large channel crosstalk and severe clock jitter in multi-channel SPDIF channel switching, and improving the stability and quality of the audio signal.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0021] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0022] Figure 1 This is a schematic flowchart illustrating the audio signal switching control method in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the audio signal switching control device shown in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of an electronic device shown in an embodiment of this application. Detailed Implementation

[0023] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0024] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0025] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In modern audio equipment, with the continuous development of multimedia technology, users often need to connect multiple digital audio sources simultaneously, such as the HDMI ARC interface of a TV, optical audio output devices, and coaxial audio interfaces. These devices typically provide SPDIF format digital audio signals, but most audio SoCs or digital audio processors are only equipped with a single SPDIF receiver interface, so they generally need to be equipped with the function of selecting and switching multiple digital audio signals.

[0027] However, the signal quality of the SPDIF transmission channel is easily affected by edge characteristics, impedance matching, and clock jitter. In particular, when multiple input signals exist simultaneously, due to insufficient isolation between channels, unselected signals can interfere with selected signals through parasitic capacitance and resistance inside the device, resulting in crosstalk. This leads to increased audio signal noise floor, deteriorated edge quality, and unstable phase-locked loop. Furthermore, additional parasitic capacitance and propagation delay are introduced during signal switching, resulting in a significant increase in SPDIF signal clock jitter. Consequently, poor audio signal quality, signal jitter, and problems such as popping and noise occur.

[0028] To address the aforementioned issues, this application provides an audio signal switching control method. By processing multiple SPDIF input audio signals separately, using an independent switching unit for each input channel to filter candidate signals, and determining the target channel to output the audio signal based on the switching control strategy and channel signal status, this method can reduce signal interference from unselected channels to the target channel, avoid the effects of large channel crosstalk and severe clock jitter in multi-channel SPDIF channel switching, and improve the stability and quality of the audio signal.

[0029] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a flowchart illustrating the audio signal switching control method shown in the embodiments of this application.

[0031] See Figure 1 An audio signal switching control method, applied to an audio input system including at least two SPDIF input channels, comprising: S110: Receives the first audio signal input through the SPDIF input channel and preprocesses the first audio signal to obtain several candidate audio signals.

[0032] Specifically, SPDIF (Sony / Philips Digital InterFace) is a digital audio interface standard that can be used to transmit digital audio signals. The audio input system can receive the first audio signal from multiple external devices, such as the HDMI ARC interface of a TV, and preprocess the first audio signal, such as removing high-frequency noise from the first audio signal to obtain several candidate audio signals.

[0033] S120: Input the candidate audio signals to the first switching unit of the corresponding SPDIF input channel respectively, and determine at least one second audio signal from the candidate audio signals through the first switching unit.

[0034] Specifically, the first switching unit is a switching module set at the front end of each SPDIF input channel. Each SPDIF input channel can be equipped with at least one first switching unit. The first switching unit can perform preliminary selection on the pre-processed candidate audio signals to determine which audio signals can be used as the second audio signals. The audio input system can select multiple audio signals as the second audio signals from multiple candidate audio signals. For example, when it is necessary to select the HDMI ARC signal, an enable command can be sent to the first switching unit corresponding to the HDMI ARC channel to make it output the candidate audio signals of HDMI ARC as the second audio signals.

[0035] S130: Based on the preset switching control strategy and the signal status parameters of the SPDIF input channel, determine a target input channel from the SPDIF input channel corresponding to the second audio signal.

[0036] Specifically, the switching control strategy is a strategy for determining whether the audio input system selects and switches between multiple available audio signals. For example, it can determine the most suitable SPDIF input channel based on parameters such as priority and signal quality. The audio input system can obtain the signal status parameters of each SPDIF input channel in real time, and determine a target input channel from the SPDIF input channels corresponding to the second audio signal according to different signal status parameters. This target input channel is the channel that can be used as the source of the current output audio signal.

[0037] S140: Output the target audio signal corresponding to the target input channel to the target receiver.

[0038] Specifically, the target receiver can be a digital audio processor. The target audio signal corresponding to the target input channel can be output to this digital audio processor, which then decodes and processes the received digital audio signal. For example, when the target input channel is an HDMI ARC channel, the audio signal of that channel will be sent to the digital audio receiver inside the SoC for processing. In traditional multi-channel SPDIF input switching schemes, a single analog switch or ordinary digital switch chip is typically used for multiple inputs. For example, in a scenario where a sound bar simultaneously receives HDMI ARC and optical OPT signals, the traditional solution would directly send both signals to a 2:1 analog switch. When HDMI ARC is selected, although the optical OPT signal is disconnected, due to insufficient channel isolation of the analog switch, the high-frequency components of the optical OPT signal may still cause crosstalk to the selected HDMI ARC signal through internal parasitic capacitance or leakage paths. In this embodiment, the crosstalk problem caused by multiple signals being connected in parallel can be avoided, allowing the digital audio receiver to receive only a single audio signal, thus improving the stability and clarity of the audio output.

[0039] For example, the audio input system is a sound bar that is simultaneously connected to the HDMI ARC output of a TV and the optical OPT output of a CD player. When user A turns on both the TV and the CD player, both the HDMI ARC channel and the optical OPT channel are simultaneously outputting digital audio signals. First, the first audio signals input from the HDMI ARC channel and the optical OPT channel are preprocessed to obtain candidate audio signals for different channels. Then, the candidate audio signals are input to the first switching unit of their respective channels. If the preset switching control strategy indicates that the HDMI ARC channel has a higher priority, the audio signal of the HDMI ARC channel is used as the second audio signal. Then, the signal status parameters of the HDMI ARC channel are obtained. If the signal status parameters at this time meet the preset conditions, the HDMI ARC channel is determined as the target input channel. Then, the audio signal of the HDMI ARC channel is sent to the digital audio receiver (DIR) chip inside the sound bar.

[0040] In one possible implementation, the first audio signal is preprocessed to obtain several candidate audio signals, including: performing input shaping and level adaptation processing on the original waveform of each first audio signal to obtain several candidate audio signals; wherein, the input shaping processing is used to adjust the signal edge quality of the first audio signal, and the level adaptation processing is used to adjust the level of the first audio signal.

[0041] Specifically, poor edges in the first audio signal can lead to difficulties in clock recovery and an increase in data error rate. By performing input shaping processing on the first audio signal, the rising and falling edges of the audio signal can be made steeper and clearer, thereby improving the integrity and noise immunity of the audio signal. Furthermore, level adaptation processing can be performed on the first audio signal to adjust its amplitude to a suitable level range, avoiding signal saturation distortion caused by excessively high levels or a decrease in signal-to-noise ratio caused by excessively low levels, further improving the integrity and reliability of the audio signal.

[0042] In one possible implementation, the SPDIF input channel includes at least two of the following: an input channel connected via an HDMI ARC interface, an input channel connected via an optical fiber SPDIF interface, and an input channel connected via a coaxial SPDIF interface. The SPDIF input channel can adopt various physical interface forms to adapt to different device connection requirements, enabling the audio input system to process audio signals input from different digital audio interfaces.

[0043] In one possible implementation, the first switching unit includes a first state and a second state. Determining at least one second audio signal from candidate audio signals using the first switching unit includes: in response to a target control signal, controlling the first switching unit corresponding to the target candidate channel to be in the first state and determining the candidate audio signal corresponding to the target candidate channel as the second audio signal; controlling the first switching unit corresponding to a non-target candidate channel to be in the second state so that the non-target candidate channel does not output an audio signal; wherein the second state includes at least one of a shutdown state, a grounded state, and a pull-down state.

[0044] Specifically, the first state is that the first switching unit is in a conducting state, enabling the audio signal of the input channel to be transmitted to the output. The second state is that the first switching unit is in a non-conducting state, preventing the audio signal from being transmitted to the output. The target control signal is an instruction used to trigger the switching operation, such as a selection instruction issued by the user through the interface. The target control signal can be used to switch the working state of the first switching unit of the target candidate channel to the first state, and to put the first switching unit corresponding to the non-target candidate channel in the second state, so that the unselected input channel does not produce any audio output, thereby avoiding interference with the target audio signal.

[0045] Specifically, the off state is when the first switching unit completely disconnects the connection between the input and output; the ground state is when the first switching unit connects the output node of the non-target candidate channel to the ground potential; and the pull-down state is when the first switching unit connects the output node of the non-target candidate channel to the ground potential through a resistor.

[0046] In one possible implementation, controlling the first switching unit corresponding to the non-target candidate channel to be in a second state includes: controlling the first switching unit to set the output node corresponding to the non-target candidate channel to a preset reference potential; wherein the preset reference potential is a ground potential or a preset invalid potential; or, controlling the first switching unit to set the output node corresponding to the non-target candidate channel to a pull-down state.

[0047] Specifically, a preset reference potential can be set in advance to invalidate the output of non-target channels. This can typically be a ground potential or a preset invalid potential, so that when the first switching unit is in the second state, the transmission of that input channel is cut off. The preset invalid potential is a non-zero voltage level that does not generate a valid audio signal. Alternatively, the first switching unit can be controlled to set the output node corresponding to the non-target candidate channel to a pull-down state, keeping the output node at a specific low level. This ensures that the non-target candidate channel does not output an audio signal. For example, an audio input system has three SPDIF input channels, and the current target input channels are SPDIF input channel 1, SPDIF input channel 2, and SPDIF input channel 3. Input channel 3 is a non-target candidate channel. To ensure that SPDIF input channels 2 and 3 do not output audio signals, the system can directly connect the output node of the first switching unit of SPDIF input channel 2 to the system ground potential. For SPDIF input channel 3, its first switching unit can be connected to the output node of ground potential through a pull-down resistor, or connected to a preset invalid DC potential, such as -0.5V, to ensure that non-target candidate channels do not output audio signals. This ensures that during audio signal switching, only the audio signal of the target input channel can be output, while the audio signals of other input channels are not output, thus improving the quality of the target audio signal output.

[0048] In one possible implementation, determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and signal state parameters of the SPDIF input channels includes: acquiring signal state parameters of the SPDIF input channels, wherein the signal state parameters include at least one of carrier state parameters, lock state parameters, valid data state parameters, and active state parameters; filtering at least one candidate input channel that meets preset input conditions from the SPDIF input channels based on the signal state parameters of the SPDIF input channels; sorting the candidate input channels based on the preset switching control strategy, and determining the candidate input channel with the highest priority among the sorted candidate input channels as the target input channel.

[0049] Specifically, the signal status parameters of an SPDIF input channel can include various parameters. Carrier status parameters indicate whether a valid clock signal exists in the SPDIF input channel; lock status parameters indicate whether the data frames of the SPDIF input channel are synchronized; valid data status parameters indicate whether the data content of the SPDIF input channel conforms to the SPDIF protocol; and active status parameters indicate whether a continuous audio data stream exists in the SPDIF input channel. Preset input conditions can be used to determine whether the signal status parameters of the SPDIF input channel meet the requirements. For example, when the carrier status parameter of the SPDIF input channel is "present," the lock status parameter is "locked," and the valid data status parameter is "valid," the SPDIF input channel is determined as a candidate input channel. After obtaining at least one candidate input channel, the candidate input channels can be sorted using a set switching control strategy. For example, a priority list can be set, sorting according to the priority of different SPDIF input channels, or sorting according to the signal status parameters of each SPDIF input channel. This comprehensively considers factors such as channel type, signal quality, and user preferences of different SPDIF input channels to determine the candidate input channel with the highest priority as the target input channel.

[0050] For example, the audio input system has channel A connected via an HDMI ARC interface and channel B connected via an optical SPDIF interface. For channel A, the system detects the presence of a carrier, a locked receive link, and valid audio data, with a continuous active audio stream. For channel B, the system detects the presence of a carrier and a locked receive link, but the audio data is invalid. The preset input condition can be that a carrier is present and the receive link is locked. Therefore, channel A meets the input condition, while channel B does not. Thus, both channel A and channel B become candidate input channels. During sorting, the preset switching control strategy can be that the HDMI ARC interface has the highest priority, followed by the optical SPDIF interface. Therefore, channel A has a higher priority than channel B, and channel A is determined as the target input channel.

[0051] Specifically, a comprehensive quality score can be calculated for each candidate input channel. For example, the comprehensive quality score can be calculated using the following formula:

[0052] in, For the first The overall quality score of each candidate input channel is used to determine its priority. The higher the overall quality score of a candidate input channel, the higher its priority. This is a carrier state parameter, taking a value of 0 or 1, where 1 = a valid carrier exists and 0 = no carrier exists. This is a lock status parameter, with a value of 0 or 1, where 1 means the receiving link has completed phase-locked locking and 0 means it is not locked. This is a valid data status parameter, taking the value 0 or 1. 1 = There is a valid audio frame conforming to the SPDIF protocol, 0 = Invalid. This is a valid data status parameter, taking the value 0 or 1. 1 = There is a valid audio frame conforming to the SPDIF protocol, 0 = Invalid. For the first The standard deviation of the signal state parameters of each channel within T1 represents the degree of fluctuation of the signal of that channel. For the candidate input channel number index; , , , These are the first weighting coefficient, the second weighting coefficient, the third weighting coefficient, and the fourth weighting coefficient, respectively. + + + =1, and , , , All are greater than 0; λ is a stability penalty coefficient, which takes a value greater than 0. The larger the value of λ, the more sensitive it is to signal jitter. Then, calculate the volatility of the channel signal state parameters using the following formula:

[0053] in, For the first The standard deviation of the signal state parameters of each channel within T1; To perform a certain action within the T1 sliding window, on the first... The first channel The combined signal state value obtained from the second sampling; For the first The mean of the state parameters of each channel over N samplings; The number of samplings within the first preset duration T1.

[0054] It can be calculated using the following formula:

[0055] Then, the target input channel is determined using the following formula:

[0056]

[0057] Among them, C ( A set of candidate channels that meet preset input conditions: a carrier must exist and the link must be locked; Enter the channel number for the final target.

[0058] For example, the Sound Bar is connected to three inputs simultaneously: HDMI ARC (Channel 1), Optical OPT (Channel 2), and Coaxial COAX (Channel 3), and is configured... =0.3、 =0.3、 =0.25、 =0.15, λ=0.5, T1=500ms, N=10 times. Obtain the status parameters corresponding to different channels: For channel 1 (HDMI ARC), its corresponding status parameters are: =1、 =1、 =1、 =0.95、 =0.04; For channel 2 (fiber OPT), the corresponding status parameters are: =1、 =1、 =0、 =0.8、 =0.18; For channel 3 (coaxial COAX), the corresponding state parameters are: =1、 =0, , , If it cannot be obtained, first filter it according to preset input conditions, channel 3. If the value is 0, the preset input conditions are not met, and the channel is excluded. The candidate input channel set C = {channel 1, channel 2} is then calculated. The comprehensive quality scores of channel 1 and channel 2 are 0.9725 and 0.63, respectively. Therefore, the target input channel is determined to be channel 1. Then, the first and second switching units of channel 1 are turned on, while the second switching units of channel 2 and channel 3 are turned off. The target audio signal of channel 1 is output to the target receiver (digital audio receiver DIR chip). The volatility penalty term can be used to control the audio system to prioritize the selection of high-quality channels and avoid channels with severe signal jitter. In addition, multiple weighting coefficients are set to allow for differentiated optimization for different product forms (such as home theater amplifiers and portable Bluetooth speakers) to suppress multi-channel parallel crosstalk, reduce clock jitter, and improve the edge quality and phase-locked stability of the output audio signal.

[0059] In one possible implementation, obtaining the signal status parameters of the SPDIF input channel includes: detecting whether there is a valid carrier in the SPDIF input channel; if so, generating carrier status information corresponding to the SPDIF input channel; detecting whether the receiving link corresponding to the SPDIF input channel meets a preset locking condition; if so, generating locking status information corresponding to the SPDIF input channel; detecting whether there is a valid audio frame in the audio signal in the SPDIF input channel; if so, generating valid status information corresponding to the SPDIF input channel; and generating signal status parameters for each SPDIF input channel based on the carrier status information, locking status information, and valid audio data status information.

[0060] Specifically, a phase-locked loop (PLL) circuit can be used to detect whether the frequency and phase of the input signal are stable in order to determine whether there is a valid carrier in the SPDIF input channel. The preset locking condition can be that the PLL continuously acquires parameters such as the clock frequency and phase of the input SPDIF signal to generate the locking status information corresponding to the SPDIF input channel. The data integrity of the data stream can be checked by parsing the data stream of the SPDIF channel to generate the valid status information corresponding to the SPDIF input channel.

[0061] In one possible implementation, determining the highest priority candidate input channel among the sorted candidate input channels as the target input channel includes: determining whether the rate of change of the signal state parameter of the highest priority candidate input channel within a first preset time period is less than a preset rate of change threshold; if it is less, then the highest priority candidate input channel is determined as the target input channel; if it is greater, then the candidate input channels are re-sorted based on the switching control strategy.

[0062] Specifically, the preset rate of change threshold and the first preset duration can be preset. For example, the preset rate of change threshold can be 5% and the first preset duration can be 500 milliseconds. The sliding window averaging method can be used to sample the signal state parameters multiple times within the first preset duration, and then calculate the rate of change between these sampled values ​​to determine whether it is greater than the preset rate of change threshold. If it is less than the preset rate of change threshold, the audio signal of the highest priority candidate input channel is considered to be relatively stable. If it is greater than the preset rate of change threshold, the audio signal of the highest priority candidate input channel is considered to be unstable, and the candidate input channel can be excluded from the sorting list. Then, the highest priority candidate input channel is re-determined, which can ensure that the audio signal of the target input channel is stable.

[0063] For example, if the locking state of an HDMI ARC channel frequently switches from "locked" to "unlocked" within 500 milliseconds, causing the preset change rate threshold to be exceeded (e.g., more than 2 state switches), the system will determine that the channel is unstable. At this time, the HDMI ARC channel can be excluded from the list, and the highest priority candidate input channel can be re-selected, thereby determining the next high-priority and stable channel as the target input channel.

[0064] In one possible implementation, the SPDIF input channel further includes a second switching unit, which, before outputting the target audio signal corresponding to the target input channel to the target receiver, includes: controlling the first switching unit of the current output channel of the audio input system to be in a closed state; after a second preset time, controlling the first switching unit and the second switching unit of the target input channel to be in an open state, and controlling the second switching unit of other SPDIF input channels to be in a closed state.

[0065] Specifically, the second switching unit is a switching module located at the rear end of each SPDIF input channel. It can be used for secondary control of the audio signal output. When it is necessary to switch the current input channel to the target input channel, the state of the first switching unit of the current input channel is first switched to the off state to disconnect the input channel. Then, after a second preset time, the states of the first and second switching units of the target input channel are set to the on state. The second preset time can be preset, for example, 100 milliseconds. At the same time, the states of the second switching units of other SPDIF input channels are set to the off state to isolate signals from non-target channels, prevent crosstalk from other input channels, and improve the quality of the target audio signal.

[0066] In one possible implementation, both the first switching unit and the second switching unit are clock buffers; wherein the root mean square of the period jitter of the first switching unit and the second switching unit is no greater than 5 picoseconds, and the peak-to-peak jitter is no greater than 30 picoseconds. The clock buffer can effectively reduce the attenuation and distortion of the clock signal on the transmission path, ensuring that multiple receiving ends receive a synchronous and high-quality clock signal.

[0067] In one possible implementation, the method further includes: determining whether there is an abnormal input state in the SPDIF input channel; if there is an abnormal input state in the SPDIF input channel, then closing the SPDIF input channel with the abnormal input state.

[0068] Specifically, abnormal input states can include signal loss, excessively high data error rate, clock synchronization failure, unstable carrier, etc. If an abnormal input state exists, the SPDIF input channel is abnormal. In this case, the SPDIF input channel is shut down to prevent the abnormal signal from affecting subsequent audio processing and output.

[0069] This application discloses an audio signal switching control method and related apparatus. The method is applied to an audio input system including at least two SPDIF input channels. The method includes: receiving a first audio signal input through an SPDIF input channel and preprocessing the first audio signal to obtain several candidate audio signals; inputting the candidate audio signals to a first switching unit of the corresponding SPDIF input channel, and determining at least one second audio signal from the candidate audio signals through the first switching unit; determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and signal state parameters of the SPDIF input channel; and outputting the target audio signal corresponding to the target input channel to a target receiver. In this method, by processing multiple SPDIF input audio signals separately, using an independent switching unit for each input channel to filter candidate signals, and determining the target channel to output the audio signal according to the switching control strategy and channel signal state, the signal interference of unselected channels to the target channel can be reduced, avoiding the effects of large channel crosstalk and severe clock jitter in multi-channel SPDIF switching methods, and improving the stability and quality of the audio signal.

[0070] Corresponding to the aforementioned application function implementation method embodiments, this application also provides an audio signal switching control device, an electronic device, and corresponding embodiments.

[0071] Figure 2 This is a schematic diagram of the structure of the audio signal switching control device shown in the embodiments of this application.

[0072] See Figure 2 An audio signal switching control device 200, applied to an audio input system including at least two SPDIF input channels, the device comprising: The receiving module 210 is used to receive the first audio signal input through the SPDIF input channel and preprocess the first audio signal to obtain several candidate audio signals. The determining module 220 is used to input candidate audio signals to the first switching unit of the corresponding SPDIF input channel, and determine at least one second audio signal from the candidate audio signals through the first switching unit. The processing module 230 is used to determine a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and the signal status parameters of the SPDIF input channel. The output module 240 is used to output the target audio signal corresponding to the target input channel to the target receiver.

[0073] In one possible implementation, the receiving module 210 is further configured to perform input shaping and level adaptation processing on the original waveform of each first audio signal to obtain several candidate audio signals; wherein, the input shaping processing is used to adjust the signal edge quality of the first audio signal, and the level adaptation processing is used to adjust the level of the first audio signal.

[0074] In one possible implementation, the receiving module 210 is further configured to include at least two of the following input channels: an input channel accessed via an HDMI ARC interface, an input channel accessed via a fiber optic SPDIF interface, and an input channel accessed via a coaxial SPDIF interface.

[0075] In one possible implementation, the first switching unit includes a first state and a second state. The determining module 220 is further configured to, in response to a target control signal, control the first switching unit corresponding to the target candidate channel to be in the first state and determine the candidate audio signal corresponding to the target candidate channel as the second audio signal; control the first switching unit corresponding to the non-target candidate channel to be in the second state so that the non-target candidate channel does not output an audio signal; wherein the second state includes at least one of a turn-off state, a grounded state, and a pull-down state.

[0076] In one possible implementation, the determining module 220 is further configured to control the first switching unit to set the output node corresponding to the non-target candidate channel to a preset reference potential; wherein the preset reference potential is a ground potential or a preset invalid potential; or, to control the first switching unit to set the output node corresponding to the non-target candidate channel to a pull-down state. In one possible implementation, the processing module 230 is further configured to acquire signal status parameters of the SPDIF input channel, the signal status parameters including at least one of carrier status parameters, lock status parameters, valid data status parameters, and active status parameters; based on the signal status parameters of the SPDIF input channel, to filter at least one candidate input channel that meets preset input conditions from the SPDIF input channels; to sort the candidate input channels based on a preset switching control strategy, and to determine the candidate input channel with the highest priority among the sorted candidate input channels as the target input channel.

[0077] In one possible implementation, the processing module 230 is further configured to detect whether there is a valid carrier in the SPDIF input channel; if so, generate carrier state information corresponding to the SPDIF input channel; detect whether the receiving link corresponding to the SPDIF input channel meets a preset locking condition; if so, generate locking state information corresponding to the SPDIF input channel; detect whether there is a valid audio frame in the audio signal in the SPDIF input channel; if so, generate valid state information corresponding to the SPDIF input channel; and generate signal state parameters for each SPDIF input channel based on the carrier state information, locking state information, and valid audio data state information.

[0078] In one possible implementation, the processing module 230 is further configured to determine whether the rate of change of the signal state parameter of the highest priority candidate input channel within a first preset time period is less than a preset rate of change threshold; if it is less, the highest priority candidate input channel is determined as the target input channel; if it is greater, the candidate input channels are re-sorted based on the switching control strategy.

[0079] In one possible implementation, the processing module 230 is further configured to control the first switching unit of the current output channel of the audio input system to be in a closed state; after a second preset time, control the first switching unit and the second switching unit of the target input channel to be in a closed state, and control the second switching unit of other SPDIF input channels to be in a closed state.

[0080] In one possible implementation, the processing module 230 is further configured such that both the first switching unit and the second switching unit are clock buffers; wherein the root mean square of the period jitter of the first switching unit and the second switching unit is not greater than 5 picoseconds, and the peak-to-peak jitter is not greater than 30 picoseconds.

[0081] In one possible implementation, the processing module 230 is further configured to determine whether there is an abnormal input state in the SPDIF input channel; if there is an abnormal input state in the SPDIF input channel, the SPDIF input channel with the abnormal input state is closed.

[0082] This application discloses an audio signal switching control device applied to an audio input system including at least two SPDIF input channels. The device comprises: a receiving module for receiving a first audio signal input through an SPDIF input channel and preprocessing the first audio signal to obtain several candidate audio signals; a determining module for inputting the candidate audio signals to first switching units of corresponding SPDIF input channels respectively, and determining at least one second audio signal from the candidate audio signals through the first switching units; a processing module for determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and signal state parameters of the SPDIF input channels; and an output module for outputting the target audio signal corresponding to the target input channel to a target receiver. In this method, by processing multiple SPDIF input audio signals separately, using an independent switching unit for each input channel to filter candidate signals, and determining the target channel to output the audio signal based on the switching control strategy and channel signal state, the interference of unselected channels on the target channel can be reduced, avoiding the effects of large channel crosstalk and severe clock jitter in multi-channel SPDIF switching methods, thus improving the stability and quality of the audio signal.

[0083] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated further here.

[0084] This application also provides an electronic device. Figure 3 This is a schematic diagram of the hardware structure of an embodiment of the electronic device of this application. The electronic device includes a memory 320 and at least one processor 310. The memory 320 is electrically connected to the at least one processor 310. The memory 320 stores instructions. The at least one processor 310 calls the instructions in the memory 320 to cause the electronic device to execute the audio signal switching control method according to any of the foregoing embodiments of this application.

[0085] Specifically, the processor 310 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0086] Memory 320 may include a mass storage device for data or instructions. For example, and not limitingly, memory 320 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 320 may include removable or non-removable (or fixed) media. Where appropriate, memory 320 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 320 is non-volatile solid-state memory. In a particular embodiment, memory 320 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0087] In one example, the control device may also include a communication interface 330 and a bus 340. The processor 310, memory 320, and communication interface 330 are connected via the bus 340 and communicate with each other.

[0088] The communication interface 330 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0089] Bus 340 includes hardware, software, or both, that couples components of an online data traffic metering device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 340 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0090] Furthermore, in conjunction with the audio signal switching control method in the above embodiments, this application embodiment can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores executable code, which, when executed by a processor, implements any one of the audio signal switching control methods in the above embodiments.

[0091] This application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0092] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0093] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0094] The above are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for switching control of audio signals, characterized in that, The method, applied to an audio input system including at least two SPDIF input channels, comprises: The system receives a first audio signal input through the SPDIF input channel and preprocesses the first audio signal to obtain several candidate audio signals. The candidate audio signals are respectively input to the first switching unit of the corresponding SPDIF input channel, and at least one second audio signal is determined from the candidate audio signals through the first switching unit; including, in response to a target control signal, controlling the first switching unit corresponding to the target candidate channel to be in a first state, and determining the candidate audio signal corresponding to the target candidate channel as the second audio signal; The first switching unit corresponding to the non-target candidate channel is controlled to be in a second state so that the non-target candidate channel does not output audio signals; wherein, the second state includes at least one of the following: off state, grounded state, and pull-down state; Based on the preset switching control strategy and the signal state parameters of the SPDIF input channel, a target input channel is determined from the SPDIF input channels corresponding to the second audio signal; The target audio signal corresponding to the target input channel is output to the target receiver.

2. The method according to claim 1, characterized in that, The preprocessing of the first audio signal yields several candidate audio signals, including: The original waveform of each of the first audio signals is subjected to input shaping and level adaptation processing to obtain several candidate audio signals; wherein, the input shaping processing is used to adjust the signal edge quality of the first audio signal, and the level adaptation processing is used to adjust the level of the first audio signal.

3. The method according to claim 1, characterized in that, The SPDIF input channels include at least two of the following: input channels connected via an HDMI ARC interface, input channels connected via an optical fiber SPDIF interface, and input channels connected via a coaxial SPDIF interface.

4. The method according to claim 1, characterized in that, The first switching unit corresponding to the non-target candidate channel is in a second state, including: The first switching unit is controlled to set the output node corresponding to the non-target candidate channel to a preset reference potential; wherein, the preset reference potential is a ground potential or a preset invalid potential; Alternatively, the first switching unit can be controlled to set the output node corresponding to the non-target candidate channel to a pull-down state.

5. The method according to claim 1, characterized in that, The method of determining a target input channel from the SPDIF input channels corresponding to the second audio signal based on the preset switching control strategy and the signal state parameters of the SPDIF input channel includes: Obtain the signal status parameters of the SPDIF input channel, wherein the signal status parameters include at least one of carrier status parameters, lock status parameters, valid data status parameters, and active status parameters; Based on the signal state parameters of the SPDIF input channel, at least one candidate input channel that meets the preset input conditions is selected from the SPDIF input channels. The candidate input channels are sorted according to a preset switching control strategy, and the candidate input channel with the highest priority among the sorted candidate input channels is determined as the target input channel.

6. The method according to claim 5, characterized in that, The process of obtaining the signal status parameters of the SPDIF input channel includes: Detect whether there is a valid carrier in the SPDIF input channel. If there is, generate carrier status information corresponding to the SPDIF input channel. Detect whether the receiving link corresponding to the SPDIF input channel meets the preset locking conditions. If it does, generate the locking status information corresponding to the SPDIF input channel. Detect whether there is a valid audio frame in the audio signal in the SPDIF input channel. If there is, generate valid status information corresponding to the SPDIF input channel. Based on the carrier state information, the lock state information, and the valid state information, signal state parameters for each SPDIF input channel are generated.

7. The method according to claim 5, characterized in that, The step of determining the highest-priority candidate input channel among the sorted candidate input channels as the target input channel includes: Determine whether the rate of change of the signal state parameter of the highest priority candidate input channel within a first preset time period is less than a preset rate of change threshold. If it is less than, then the candidate input channel with the highest priority is determined as the target input channel; If the value is greater than the value, the candidate input channels are reordered based on the switching control strategy.

8. The method according to claim 1, characterized in that, The SPDIF input channel further includes a second switching unit, which, before outputting the target audio signal corresponding to the target input channel to the target receiver, includes: The first switching unit of the current output channel of the audio input system is controlled to be in the off state; After a second preset time period, the first and second switching units of the target input channel are turned on, and the second switching units of the other SPDIF input channels are turned off.

9. The method according to claim 8, characterized in that, Both the first switching unit and the second switching unit are clock buffers; The root mean square of the period jitter of the first switching unit and the second switching unit is no greater than 5 picoseconds, and the peak-to-peak jitter is no greater than 30 picoseconds.

10. The method according to claim 5, characterized in that, Also includes: Determine whether the SPDIF input channel has an abnormal input state; If the SPDIF input channel has the abnormal input state, then the SPDIF input channel with the abnormal input state is closed.

11. An audio signal switching control device, characterized in that, An audio input system comprising at least two SPDIF input channels, the device comprising: The receiving module is used to receive the first audio signal input through the SPDIF input channel and preprocess the first audio signal to obtain several candidate audio signals. The determining module is configured to input the candidate audio signals to the first switching unit of the corresponding SPDIF input channel, and determine at least one second audio signal from the candidate audio signals through the first switching unit; including, in response to a target control signal, controlling the first switching unit corresponding to the target candidate channel to be in a first state, and determining the candidate audio signal corresponding to the target candidate channel as the second audio signal; The first switching unit corresponding to the non-target candidate channel is controlled to be in a second state so that the non-target candidate channel does not output audio signals; wherein, the second state includes at least one of the following: off state, grounded state, and pull-down state; The processing module is used to determine a target input channel from the SPDIF input channels corresponding to the second audio signal based on a preset switching control strategy and the signal state parameters of the SPDIF input channel. The output module is used to output the target audio signal corresponding to the target input channel to the target receiver.

12. An electronic device, characterized in that, include: processor; as well as A memory having executable code stored thereon, which, when executed by the processor, causes the processor to perform the method as described in any one of claims 1-10.

13. A computer-readable storage medium, characterized in that, It stores executable code that, when executed by a processor of an electronic device, causes the processor to perform the method as described in any one of claims 1-10.

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