Electronic device with anti-blast sound and control method thereof

Abstract

The present application discloses an electronic device with anti-blast sound and a control method thereof. The electronic device includes an audio output circuit and an anti-blast sound circuit. The anti-blast sound circuit is electrically connected with the audio output circuit. The anti-blast sound circuit has a switching unit for switching between a low potential reference point and an audio playing device. At a first time point, the audio output circuit is enabled by receiving a high potential, and the switching unit is switched to be conducted to the low potential reference point. At a second time point later than the first time point, the audio output circuit is maintained to be enabled, and the switching unit is switched to be conducted to the audio playing device instead of the low potential reference point.

Description

Technical Field

[0001] This application relates to an electronic device, and more particularly to an electronic device with explosion-proof sound protection and its control method. Background Technology

[0002] A keyboard, video, and mouse switch (KVM) is a device that allows control of multiple computers using a single keyboard, mouse, and monitor. Secure KVM (SKVM) builds upon the traditional KVM architecture by providing enhanced security features, including authentication and monitoring of the legitimacy of USB devices connected to the SKVM.

[0003] In conventional technology, according to SKVM specifications, such as SKVM PP4.0 SPEC, after SKVM powers on, it performs a self-test to check if all input / output ports (I / O) are valid devices. Then, it checks if the SKVM has been physically removed and detects the status of the anti-tampering IC. Only after all statuses are confirmed can SKVM functionality be enabled. Please refer to [link to relevant documentation]. Figure 1 The diagram shows a block illustration of the conventional SKVM internal architecture. After SKVM 1 is powered on, it performs a self-test process for approximately 9 seconds. During these 9 seconds, the system power supply charges capacitors C1, C2, and C3. After the self-test ends, the audio source channel is activated, electrically connecting amplifier 11 and speaker 12. Upon activation of the audio source channel, capacitor C1 on the channel momentarily releases voltage, causing a popping sound from speaker 12.

[0004] Besides producing a popping sound during startup, when the SKVM 1 switches between computer PC1 or PC2 via the switching element 10 to establish a channel between computer PC1 or PC2 and speaker 12, the voltage accumulated in capacitors C2 or C3 during the previous power-on self-test will also cause the speaker 12 to produce a popping sound due to its instantaneous release. Furthermore, when the SKVM power is turned off, the system power supply's slower voltage release compared to the capacitor's transient characteristics will also cause the speaker 12 to produce a popping sound.

[0005] In summary, there is a need for an electronic device and control method to prevent popping sounds in order to solve the problems caused by conventional technology. Summary of the Invention

[0006] This application provides an electronic device and its control method with anti-pop noise. Using a multiplexer and delay circuit architecture, it can determine the timing of power-on, power-off and switching between different channels, and then switch the capacitor on the audio channel connected to the speaker to the path of the low potential reference point to release the voltage stored in the capacitor, thereby solving the problem of popping noise.

[0007] In one embodiment, this application provides an electronic device with anti-explosive noise, including an audio output circuit and an anti-explosive noise circuit electrically connected to the audio output circuit. The anti-explosive noise circuit has a switching unit for switching between a low potential reference point and an audio playback device, wherein: at a first time point, the audio output circuit receives a high potential and is enabled, and the switching unit is switched to conduct at the low potential reference point; at a second time point later than the first time point, the audio output circuit remains enabled, and the switching unit is switched to conduct at the audio playback device.

[0008] In one embodiment, this application provides an anti-pop noise control method, comprising the following steps: First, detecting whether the audio output circuit of an electronic device is enabled. When the audio output circuit is enabled by receiving a high potential at a first time point, switching the switching unit of the electronic device to conduct at a low potential reference point. Finally, at a second time point later than the first time point, while the audio output circuit remains enabled, controlling the switching unit to switch to conduct on the audio playback device. Attached Figure Description

[0009] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0010] Figure 1 This is a block diagram illustrating the commonly used internal architecture of SKVM.

[0011] Figure 2A This is a schematic diagram of an embodiment of the electronic device with explosion-proof sound protection according to this application.

[0012] Figure 2B This is a schematic diagram of an embodiment of the explosion-proof noise circuit of this application.

[0013] Figure 3 This is a schematic flowchart illustrating an embodiment of the control method for the explosion-proof electronic device of this application.

[0014] Figure 4 This is a schematic diagram of another embodiment of the explosion-proof noise-proof circuit of this application.

[0015] Figure 5 This is a schematic flowchart of another embodiment of the explosion-proof noise control method of this application. Detailed Implementation

[0016] Various exemplary embodiments will be more fully described below with reference to the accompanying drawings, some of which illustrate exemplary embodiments. However, the concepts of this application may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this application will be exhaustive and complete, and will fully convey the scope of the concepts of this application to those skilled in the art. Similar numerals always indicate similar elements. The audio conversion apparatus and its multimedia control apparatus will be described below with reference to various embodiments and accompanying drawings; however, the following embodiments are not intended to limit the application.

[0017] Please see Figure 2A and Figure 2B As shown, where Figure 2A This is a schematic diagram of the architecture of an embodiment of the electronic device with explosion-proof sound according to this application; Figure 2B This is a schematic diagram of the anti-explosion noise circuit architecture of this application. In this embodiment, electronic device 2 is an SKVM device, but it is not limited to this. For example, a traditional KVM, or any electronic device connected to an audio playback device, such as an amplifier, can be used as the electronic device of this application. Electronic device 2 includes a switching circuit 20, an audio output circuit 21, and an anti-explosion noise circuit 22. The switching circuit 20 is electrically connected to a plurality of computers PC1 and PC2. The switching circuit 20 can switch to electrical connection with one of the computers PC1 or PC2 according to the user's selection, so as to receive audio and video signals output by computer PC1 or PC2, and input keyboard and mouse signals to the selected computer PC1 or PC2. It should be noted that, for the convenience of explaining the function of audio anti-explosion noise control in the embodiment of this application, only the audio transmission channel is shown in the figure, and other channels related to video or keyboard and mouse signals are omitted.

[0018] The audio output circuit 21 is electrically connected to the switching circuit 20 and the anti-exposure circuit 22. The audio output circuit 21 has an amplifier 210 for receiving the audio signal 91 from the selected computer PC1 or PC2 output from the switching circuit 20. After processing the audio signal 91, the amplifier 210 outputs the sound to the audio playback device 23 through the anti-exposure circuit 22 to produce sound. In one embodiment, the audio playback device 23 is a speaker, such as a loudspeaker. A capacitor C1 is provided between the amplifier 210 and the anti-exposure circuit 22.

[0019] The explosion-proof sound circuit 22 is electrically connected to the audio output circuit 21. The explosion-proof sound circuit 22 has a switching unit 220 for switching between a low potential reference point (GND) and the audio playback device 23. The input terminal 220a of the switching unit 220 is electrically connected to the audio output circuit 21 to receive the audio signal 91. The switching unit 220 further has a first output terminal 220b and a second output terminal 220c, wherein the first output terminal 220b is electrically connected to the low potential reference point (GND), and the second output terminal 220c is electrically connected to the audio playback device 23 to output the audio signal 91 to the audio playback device 23. In this embodiment, the switching unit 220 is a multiplexer or switching circuit, and the low potential reference point (GND) represents ground.

[0020] The anti-exposure circuit 22 further includes a delay circuit 221 and a control unit 222. The delay circuit 221 is electrically connected to the switching unit 222. The delay circuit 221 can output a first control signal to control the switching unit 220 to conduct at the low potential reference point GND, or output a second control signal to control the switching unit 220 to conduct at the audio playback device 23. It should be noted that the delay circuit 221 can be composed of passive component OP amplifiers or semiconductor components, such as BJTs, MOS, or diode components. Its circuit architecture is well known to those skilled in the art and will not be described in detail here. The control unit 222 is electrically connected to the delay circuit 221 and the audio output circuit 21. The control unit 222 controls the delay circuit 221 to output the first control signal or the second control signal. The control unit 222 can also output a third control signal to control the amplifier 210 to activate the mute mode, causing the audio output circuit 21 to stop outputting audio signals.

[0021] At a first time point, such as when electronic device 2 is powered on, the audio output circuit receives a high potential and is enabled. At this time, control unit 222 controls delay circuit 221 to send a first control signal to switch switching unit 220 to conduct at the low potential reference point GND. At a second time point later than the first time point, while the audio output circuit remains enabled, such as when electronic device 2 completes its self-test process, control unit 222 controls delay circuit 221 to output a second control signal to switch switching unit 220 to conduct at audio playback device 23. In another embodiment, at a third time point later than the second time point, such as when electronic device 2 is powered off, control unit 222 controls delay circuit 221 to again output the first control signal to switch switching unit 222 from conducting at audio playback device 23 to conducting at the low potential reference point GND. Since electronic device 2 is powered off, after the third time point, audio output circuit 21 does not receive a high potential. The control methods of control unit 222, delay circuit 221, and switching unit 220 will be described in detail later.

[0022] Please see Figures 2A to 2B as well as Figure 3 As shown, where, Figure 3 This is a schematic flowchart of an embodiment of the control method for the explosion-proof electronic device of this application. In the flow of control method 3, step 30 is first performed to detect whether the audio output circuit 21 of the electronic device 2 is enabled. Then, step 31 is performed. When the audio output circuit 21 receives a high potential, such as 5V, at a first time point and is enabled, the switching unit 220 of the electronic device 2 is switched to be turned on at the low potential reference point GND.

[0023] In step 31, one embodiment of the first time point is the time point when the electronic device 2 is started. When the electronic device 2 is started, a first high-potential output operating voltage, such as 5V, electrically connected to the audio output circuit 21, enables the amplifier 210 of the audio output circuit 21. Simultaneously, the electronic device 2 performs a self-test after power-on according to specifications, such as SKVM PP4.0 SPEC. During the self-test, a second high-potential output operating voltage, such as 3.3V, within the electronic device 2 charges capacitors C1, C2, and C3, which are electrically coupled to it. The charged capacitor C1 discharges through the audio playback device 23 after the electronic device is started, thus producing a popping sound; the charged capacitors C2 and C3 discharge through the audio playback device 23 when the user switches between selecting the corresponding channel of computer PC1 or PC2, thus producing a popping sound. Therefore, the following explains how this application solves the popping sound problem.

[0024] First, to solve the problem of popping noise from the speaker when capacitor C1 discharges, at the first time point, the control unit 222 of the electronic device 2 controls the delay circuit 221 to output a first control signal to switch the switching unit 220 to be connected to the low-potential reference point GND electrically connected to the first output terminal 220b. Therefore, the DC level of capacitor C1 discharge is transmitted to the low-potential reference point GND via the input terminal 220a and the first output terminal 220b, and discharged to ground. This prevents the discharge path of capacitor C1 from being connected to the audio playback device 23, thus solving the problem of popping noise from the audio playback device 23. In this embodiment, the first control signal is a low-level signal.

[0025] It should be noted that the control unit 222 and the delay circuit 221 are not related. Figure 2B The method shown is a limitation; in another embodiment, such as Figure 4 The explosion-proof noise reduction circuit 21 shown further includes a switching element 223, such as an electromechanical switching element or a semiconductor switching element, such as a PMOS, which can be implemented. The switching element 223 is electrically connected to the control unit 222 and the delay circuit 221 at a potential of 3.3V in this embodiment. Another embodiment of step 31 is constructed on... Figure 4In the illustrated architecture, at the first time point, when electronic device 2 is activated, the high-potential enable audio output circuit 21 is activated, and control unit 222 controls switching element 223 to disconnect the power to delay circuit 221. At this time, the output of delay circuit 221 is at a low level (first control signal) and triggers switching unit 220 to connect with the low-potential reference point GND, causing capacitor C1 to discharge to ground, thus preventing audio playback device 23 from producing popping sounds. In this embodiment, the first control signal is a low-potential signal. At the second time point, control unit controls delay circuit to output a second control signal to switch switching unit 220 to connect to audio playback device 23.

[0026] After step 31, step 32 is performed. At a second time point later than the first time point, the audio output circuit 21 remains enabled by a high potential, causing the control unit 222 to control the delay circuit 221 to output a second control signal, thereby switching the switching unit 220 to be turned on to the audio playback device 23. In this step, in one embodiment, the second time point is after the self-test ends or after capacitor C1 has finished discharging. Figure 2B In the illustrated architecture embodiment, the control unit 222 controls the delay circuit 221 to generate a second control signal (a high-level signal in this embodiment) to trigger the switching unit 220, causing the input terminal 220a to be electrically connected to the second output terminal 220b. At this time, the audio output circuit 21 and the audio playback device 23 are turned on to output the audio signal output by the selected computer PC1 or PC2. Another embodiment of step 32 is as follows... Figure 4 As shown, the control unit 222 controls the switching element 223 to enable the delay circuit 221 to receive an operating voltage of 3.3V, thus supplying power to the delay circuit 221. After the delay circuit 221 is powered on, it generates a second control signal (a high-level signal in this embodiment) to trigger the switching unit 220, causing the input terminal 220a to be electrically connected to the second output terminal 220b, thereby connecting the audio output circuit 21 to the audio playback device 23.

[0027] After step 32, step 33 is performed to detect whether the electronic device is powered off. In this step, after powering off, when the high potential of 3.3V decays to a critical value (e.g., 2.97V in this embodiment), the delay circuit 221 outputs a first control signal (low level signal) to switch the switching unit 220 to conduct at the low potential reference point GND. That is, when the power supply to the electronic device 2 is turned off, the potential supplying power to the delay circuit 221 gradually decays. Once the power voltage decays to a critical value, i.e., a specific voltage level, step 34 is performed to trigger the delay circuit 221 to use the first control signal to trigger the switching unit 220 to conduct at the low potential reference point GND. This allows the voltage released by capacitor C1 due to transient characteristics to discharge at the low potential reference point GND instead of the audio playback device 23, thereby preventing the audio playback device 23 from producing popping sounds. In this embodiment, the specific voltage level is 2.97V, but it is not a limitation. It should be noted that the magnitude of the specific voltage level is determined by the characteristics of the delay circuit 221, and is not limited to the aforementioned voltage level.

[0028] Please see Figures 2A to 2B , Figure 4 and Figure 5 As shown, where Figure 5 This is a schematic flowchart of another embodiment of the explosion-proof noise control method of this application. In this embodiment, the electronic device 2 is a safety-type multi-computer switching device, and the flowchart of the explosion-proof noise control method 3a is shown in steps 30-34. Figure 3 The same applies, so it will not be repeated here. This embodiment further includes step 35, where the multi-computer switching device selects one of the computers, causing the audio output circuit 21 to receive the audio output from the selected computer PC1 or PC2. It should be noted that after the power-on self-test, capacitors C2 and C3 on the channels connected to computers PC1 and PC2 will be charged. Alternatively, in another scenario, when the user switches between computers PC1 and PC2, the voltage released by the transient characteristics of capacitors C2 or C3 may cause popping sounds in the audio playback device 23.

[0029] Therefore, in step 35, before detecting that the user has switched to select one of the computers PC1 or PC2, and before the selected computer PC1 or PC2 outputs audio to the audio output circuit 21, step 36 is performed. The control unit 222 controls the delay circuit 221 to output a first control signal to switch the switching unit 220 to be connected to the low potential reference point GND. The detailed method is as described above and will not be repeated here. Afterwards, in step 37, after the multi-computer switching device selects computer PC1 or PC2, the control unit 222 controls the delay circuit 221 to output a second control signal to switch the switching unit 220 to be connected to the audio playback device 23, so that the audio playback device 23 plays the output audio from the selected computer PC1 or PC2.

[0030] In summary, by utilizing the anti-pop electronic device and its control method provided in this application, through the architecture of multiplexer and delay circuit, the capacitor can be grounded when the power is turned on, turned off, and when switching between different computers, thus avoiding popping noise caused by the capacitor discharging to the speaker.

[0031] The above description is merely a preferred embodiment or example of the technical means employed in this application to solve the problem, and is not intended to limit the scope of this patent application. Any changes or modifications that conform to the wording of this patent application or are made in accordance with the scope of this patent application are covered by the scope of this patent application.

Claims

1. An electronic device with anti-explosive noise, electrically connected to an audio playback device, wherein the electronic device is characterized in that, include: The audio output circuit includes an amplifier; An anti-explosion circuit is electrically connected between the audio output circuit and the audio playback device. The anti-explosion circuit has a switching unit, which is used to switch between a low potential reference point and the audio playback device. as well as A capacitor, one end of which is electrically connected to the amplifier, and the other end of which is electrically connected to the switching unit; At a first time point, the audio output circuit receives a high potential and is enabled, and the switching unit electrically connects the capacitor to a low potential reference point; at a second time point later than the first time point, the audio output circuit remains enabled, and the switching unit is switched to change the capacitor from being electrically connected to the low potential reference point to being electrically connected to the audio playback device.

2. The electronic device with explosion-proof sound protection according to claim 1, characterized in that, The anti-explosion noise circuit further has the following features: Control unit; The delay circuit is electrically connected to the control unit and the switching unit. Before the second time point, the control unit controls the delay circuit to output a first control signal to switch the switching unit to conduct at the low potential reference point. At the second time point, the control unit controls the delay circuit to output a second control signal to switch the switching unit to conduct at the audio playback device.

3. The electronic device with explosion-proof sound protection according to claim 2, characterized in that, At a third time point later than the second time point, the control unit controls the delay circuit to output the first control signal to switch the switching unit to conduct at the low potential reference point, wherein after the third time point, the audio output circuit does not receive the high potential.

4. The electronic device with explosion-proof sound protection according to claim 2, characterized in that, The electronic device is a multi-computer switching device coupled to a plurality of computers. After the second time point, before the multi-computer switching device switches from the first computer to the second computer among the plurality of computers, the control unit controls the delay circuit to output the first control signal to switch the switching unit to conduct at the low potential reference point, and after switching to the second computer, outputs the second control signal to switch the switching unit from the low potential reference point to conduct at the audio playback device.

5. A method for controlling explosion-proof noise, executed by an electronic device, the electronic device having an audio output circuit, an explosion-proof noise circuit, and a capacitor, the audio output circuit having an amplifier, the explosion-proof noise circuit being electrically connected between the audio output circuit and an audio playback device and having a switching unit, one end of the capacitor being electrically connected to the amplifier and the other end being electrically connected to the switching unit, characterized in that... Includes the following steps: Detect whether the audio output circuit of the electronic device is enabled; When the audio output circuit is enabled by receiving a high potential at a first time point, the switching unit of the electronic device electrically connects the capacitor to a low potential reference point. At a second time point later than the first time point, the audio output circuit remains enabled, controlling the switching unit to switch the capacitor from being electrically connected to the low potential reference point to being electrically connected to the audio playback device.

6. The anti-explosion noise control method according to claim 5, wherein the anti-explosion noise circuit further comprises a control unit and a delay circuit, the delay circuit being electrically connected to the control unit and the switching unit, characterized in that, It also includes the following steps: At the first time point, the control unit of the electronic device controls the delay circuit to output a first control signal to switch the switching unit to conduct at the low potential reference point; and at the second time point, the control unit controls the delay circuit to output a second control signal to switch the switching unit to conduct at the audio playback device.

7. The method for controlling explosion-proof noise according to claim 6, characterized in that, It also includes the following steps: when the high potential decays to a critical value, the delay circuit outputs the first control signal to switch the switching unit to conduct at the low potential reference point.

8. The method for controlling explosion-proof noise according to claim 6, characterized in that, The electronic device is a multi-computer switching device coupled to a plurality of computers, and the method further includes the following steps: When the multi-computer switching device selects one of the computers, the audio output circuit receives the audio output from the selected computer. The control unit controls the delay circuit to output the first control signal to switch the switching unit to be turned on at the low potential reference point; and After the multiple computer switching device selects the computer, the control unit controls the delay circuit to output the second control signal to switch the switching unit to the audio playback device, so that the audio playback device plays the output audio of the selected computer.

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