Synchronous and asynchronous audio playing device and multimedia playing equipment

Abstract

The utility model discloses a synchronous and asynchronous audio playing device and multimedia playing equipment. The synchronous and asynchronous audio playing device comprises a gating unit and a main control unit. The gating unit comprises an asynchronous audio signal input end, a synchronous audio signal input end, a gating signal input end and an audio output end; the asynchronous audio signal input end is used for receiving an asynchronous audio signal; the synchronous audio signal input end is used for receiving a synchronous audio signal; the gating signal output end of the main control unit is connected with the gating signal input end, and the main control unit is used for sending a gating signal to the gating signal input end; the gating unit is used for gating the asynchronous audio signal input end and the audio output end or gating the synchronous audio signal input end and the audio output end according to the gating signal. According to the utility model, the audio frequency can be automatically switched along with the picture when the program is in the synchronous playing mode and the asynchronous playing mode, and manual intervention is not needed.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of audio playback, and in particular to a synchronous and asynchronous audio playback device and a multimedia playback equipment. Background Art

[0002] At present, in the field of light emitting diode (LED) full-color control system player box, the LED display control system player box supports two program play modes: synchronous play and asynchronous play.

[0003] From the actual application scenarios of the current full-color control system, users will switch back and forth between the two modes of synchronous playback and asynchronous playback during use. This requires that the sound be switched synchronously with the current program content during playback. In the asynchronous playback mode, the audio is processed by the LED full-color control system playback box and directly output to the audio equipment, but in the synchronous playback mode, the audio comes from the High Definition Multimedia Interface (HDMI) input signal source. In the past, the audio was generally output directly to the audio from HDMI signal source input devices such as computers and video playback boxes. In this way, during the switching process of synchronous and asynchronous playback modes, it is necessary to manually connect the corresponding audio to the audio, and it is impossible to play the same signal source audio with the current playback content. In addition, since the audio and the LED full-color control system playback box, LED display, etc. are generally in the same position, and are not necessarily in the same position as the HDMI input signal source such as the computer host and video playback box, in the synchronous playback mode, when manually connecting the corresponding audio to the audio, it will cause wiring difficulties and other problems. Utility Model Content

[0004] The utility model provides a synchronous and asynchronous audio playing device and a multimedia playing device, so as to realize automatic switching of audio following picture when a program is in a synchronous playing mode and an asynchronous playing mode, without manual intervention.

[0005] In a first aspect, an embodiment of the utility model provides a synchronous and asynchronous audio playback device, including a gating unit and a main control unit;

[0006] The gating unit comprises an asynchronous audio signal input terminal, a synchronous audio signal input terminal, a gating signal input terminal and an audio output terminal; the asynchronous audio signal input terminal is used to receive an asynchronous audio signal; the synchronous audio signal input terminal is used to receive a synchronous audio signal;

[0007] The selection signal output terminal of the main control unit is connected to the selection signal input terminal, and the main control unit is used to send a selection signal to the selection signal input terminal; the selection unit is used to select the asynchronous audio signal input terminal and the audio output terminal, or select the synchronous audio signal input terminal and the audio output terminal according to the selection signal.

[0008] Optionally, the asynchronous audio signal input terminal includes an asynchronous data signal input terminal and an asynchronous control signal input terminal, the synchronous audio signal input terminal includes a synchronous data signal input terminal and a synchronous control signal input terminal, and the audio output terminal includes a data signal output terminal and a control signal output terminal;

[0009] The asynchronous data signal input terminal is used to input an asynchronous serial data signal, and the asynchronous control signal input terminal is used to input an asynchronous control signal; the synchronous data signal input terminal is used to input a synchronous serial data signal, and the synchronous control signal input terminal is used to input a synchronous control signal;

[0010] The gating unit is used to gating the asynchronous control signal input terminal and the control signal output terminal, and the asynchronous data signal input terminal and the data signal output terminal according to the gating signal; or,

[0011] The gating unit is used for gating the synchronous control signal input terminal and the control signal output terminal, and the synchronous data signal input terminal and the data signal output terminal according to the gating signal.

[0012] Optionally, the asynchronous control signal input terminal includes an asynchronous bit clock signal input terminal, an asynchronous frame clock signal input terminal and an asynchronous master clock signal input terminal; the asynchronous bit clock signal input terminal, the asynchronous frame clock signal input terminal and the asynchronous master clock signal input terminal are used to input an asynchronous bit clock signal, an asynchronous frame clock signal and an asynchronous master clock signal respectively;

[0013] The synchronous control signal input end includes a synchronous bit clock signal input end, a synchronous frame clock signal input end and a synchronous master clock signal input end; the synchronous bit clock signal input end, the synchronous frame clock signal input end and the synchronous master clock signal input end are used to input the synchronous bit clock signal, the synchronous frame clock signal and the synchronous master clock signal respectively.

[0014] Optionally, the synchronous and asynchronous audio playback device further includes an audio and video conversion unit, the input end of the audio and video conversion unit is used to obtain multimedia signals; the synchronous audio signal output end of the audio and video conversion unit is connected to the synchronous audio signal input end;

[0015] The audio-video conversion unit is used to form the synchronous audio signal according to the multimedia signal, and output the synchronous audio signal through the synchronous audio signal output terminal.

[0016] Optionally, the video signal output end of the audio and video conversion unit is connected to the video signal input end of the main control unit, and the audio and video conversion unit is also used to form a video signal according to the multimedia signal and output the video signal through the video signal output end.

[0017] Optionally, the main control unit further includes an asynchronous audio signal output terminal, and the asynchronous audio signal output terminal is connected to the asynchronous audio signal input terminal;

[0018] The main control unit is further used to determine the asynchronous audio signal according to the asynchronous video signal, and output the asynchronous audio signal through the asynchronous audio signal output terminal.

[0019] Optionally, the synchronous and asynchronous audio playback device further includes a digital-to-analog conversion unit, an input end of the digital-to-analog conversion unit is connected to the audio output end of the selection unit, and the digital-to-analog conversion unit is used to convert the asynchronous audio signal or the synchronous audio signal into an audio analog signal.

[0020] Optionally, the synchronous and asynchronous audio playback device further includes an audio output socket, an input end of the audio output socket is connected to an output end of the digital-to-analog conversion unit, and the audio output socket is used to receive and output the audio analog signal.

[0021] Optionally, the synchronous and asynchronous audio playback apparatus further includes an audio playback device, wherein the audio playback device is connected to an output interface of the audio output socket, and the audio playback device is used to play audio according to the audio analog signal.

[0022] In a second aspect, an embodiment of the present utility model further provides a multimedia playback device, comprising the synchronous and asynchronous audio playback device described in any embodiment of the present utility model.

[0023] The utility model provides a synchronous and asynchronous audio playback device, wherein the asynchronous audio signal input end of the selection unit receives an asynchronous audio signal; the synchronous audio signal input end of the selection unit receives a synchronous audio signal. During asynchronous display, the selection unit selects the asynchronous audio signal input end and the audio output end according to the selection signal, so that the asynchronous audio signal is output from the audio output end. During synchronous display, the selection unit selects the synchronous audio signal input end and the audio output end according to the selection signal, so that the synchronous audio signal is output from the audio output end, thereby realizing control of the audio signal output by the selection unit through the main control unit. The utility model solves the technical problem in the prior art that the corresponding audio needs to be manually connected to the audio system during the synchronous and asynchronous playback mode switching process, and realizes that the audio automatically switches with the picture when the program is in the synchronous playback mode and the asynchronous playback mode, without manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a synchronous and asynchronous audio playback device provided by an embodiment of the utility model.

[0025] Figure 2 A schematic diagram of the structure of another synchronous and asynchronous audio playback device provided in an embodiment of the utility model.

[0026] Figure 3 A schematic diagram of the structure of another synchronous and asynchronous audio playback device provided in an embodiment of the utility model.

[0027] Figure 4 A schematic structural diagram of a digital-to-analog conversion unit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] The embodiment of the utility model provides a synchronous and asynchronous audio playback device, Figure 1 Schematic diagram of the structure of a synchronous and asynchronous audio playback device provided by an embodiment of the utility model. The synchronous and asynchronous audio playback device provided by an embodiment of the utility model is suitable for switching synchronous and asynchronous audio playback, such as Figure 1As shown, the synchronous and asynchronous audio playback device includes a selection unit 110 and a main control unit 210; the selection unit 110 includes an asynchronous audio signal input terminal A, a synchronous audio signal input terminal B, a selection signal input terminal SWT and an audio output terminal D; the asynchronous audio signal input terminal A is used to receive an asynchronous audio signal a0; the synchronous audio signal input terminal B is used to receive a synchronous audio signal b0; the selection signal output terminal of the main control unit 210 is connected to the selection signal input terminal SWT, and the main control unit 210 is used to send a selection signal S1 to the selection signal input terminal SWT; the selection unit 110 is used to select the asynchronous audio signal input terminal A and the audio output terminal D, or select the synchronous audio signal input terminal B and the audio output terminal D according to the selection signal.

[0030] Among them, the main control unit 210 can be a core control unit of a multimedia playback device, for example, including a microprocessor (Advanced RISC Machine, ARM), and the multimedia playback device can be a TV, a LED full-color control system playback box, etc. The main control unit 210 can send a selection signal S1 to the selection signal input terminal SWT of the selection unit 110 to control the conduction between different input terminals and output terminals of the selection unit 110. The asynchronous audio signal a0 can be sent to the selection unit 110 by the main control unit 210 in the asynchronous playback mode, and the embodiment of the utility model is not limited here. The synchronous audio signal b0 can be transmitted from the audio input signal source to the selection unit 110 in the synchronous playback mode.

[0031] Specifically, the asynchronous audio signal input terminal A of the gating unit 110 can receive the asynchronous audio signal a0; the synchronous audio signal input terminal B of the gating unit 110 can receive the synchronous audio signal b0; and the gating signal input terminal SWT of the gating unit 110 can receive the gating signal S1. In the asynchronous playback mode, the main control unit 210 sends a selection signal S1 to the selection signal input terminal SWT of the selection unit 110, controls the selection unit 110 to select the asynchronous audio signal input terminal A and the audio output terminal D, and outputs the asynchronous audio signal a0 from the audio output terminal D to the audio playback device. At the same time, the main control unit 210 can control the display screen to play the program picture corresponding to the audio signal output by the audio output terminal D; in the synchronous playback mode, the main control unit 210 sends a selection signal S1 to the selection signal input terminal SWT of the selection unit 110, controls the selection unit 110 to select the synchronous audio signal input terminal B and the audio output terminal D, and outputs the synchronous audio signal b0 from the audio output terminal D to the audio playback device. At the same time, the main control unit 210 can control the display screen to play the program picture corresponding to the audio signal output by the audio output terminal D, thereby realizing that the audio automatically switches with the picture when the program switches between the synchronous playback mode and the asynchronous playback mode, and realizes that the audio of the same signal source is played following the current playback content, without the need to manually connect the corresponding audio to the audio playback device.

[0032] It should be noted that the selection signal S1 can be a high level signal or a low level signal. Exemplarily, when the selection signal input terminal SWT of the selection unit 110 is at a low level, the selection unit 110 selects the asynchronous audio signal input terminal A and the audio output terminal D; when the selection signal input terminal SWT of the selection unit 110 is at a high level, the synchronous audio signal input terminal B and the audio output terminal D are selected. The main control unit 210 can realize the conduction between different input terminals and output terminals of the selection unit 110 by controlling the level of the selection signal input terminal SWT of the selection unit 110.

[0033] The embodiment of the utility model provides a synchronous and asynchronous audio playback device, including a gating unit and a main control unit; the gating unit includes an asynchronous audio signal input terminal, a synchronous audio signal input terminal, a gating signal input terminal and an audio output terminal; the asynchronous audio signal input terminal receives an asynchronous audio signal; the synchronous audio signal input terminal receives a synchronous audio signal, and the asynchronous audio signal and the synchronous audio signal can be directly sent to the gating unit, and the audio output is selected by the gating unit; the gating signal output terminal of the main control unit is connected to the gating signal input terminal, and the main control unit is used to send a gating signal to the gating signal input terminal; the gating unit is used to select the asynchronous audio signal input terminal and the audio output terminal, or select the synchronous audio signal input terminal and the audio output terminal according to the gating signal, so as to control the audio signal output by the gating unit through the main control unit. The utility model solves the technical problem in the prior art that the corresponding audio needs to be manually connected to the sound system during the synchronous and asynchronous playback mode switching process, and realizes that the audio automatically switches with the picture when the program is in the synchronous playback mode and the asynchronous playback mode, without manual intervention.

[0034] The present utility model also provides another synchronous and asynchronous audio playback device, which is improved on the basis of the above embodiment. Figure 2A schematic diagram of the structure of another synchronous and asynchronous audio playback device provided by an embodiment of the utility model, wherein the asynchronous audio signal input terminal A includes an asynchronous data signal input terminal A4 and an asynchronous control signal input terminal A1-3, the synchronous audio signal input terminal B includes a synchronous data signal input terminal B4 and a synchronous control signal input terminal B1-3, and the audio output terminal D includes a data signal output terminal D4 and a control signal output terminal D1-3. The asynchronous data signal input terminal A4 is used to input an asynchronous serial data signal a4, and the asynchronous control signal input terminal A1-3 is used to input an asynchronous control signal a1-3a; the synchronous data signal input terminal B4 is used to input a synchronous serial data signal b4, and the synchronous control signal input terminal B1-3 is used to input a synchronous control signal b1-3. The selection unit 110 is used to select the asynchronous control signal input terminal A1-3 and the control signal output terminal D1-3, and the asynchronous data signal input terminal A4 and the data signal output terminal D4 according to the selection signal S1; or, the selection unit 110 is used to select the synchronous control signal input terminal B1-3 and the control signal output terminal D1-3, and the synchronous data signal input terminal B4 and the data signal output terminal D4 according to the selection signal S1.

[0035] Among them, the selection unit 110 can be a four-channel single-pole double-throw analog switch, which has two data signal input terminals and one signal output terminal. Each data signal input terminal and signal output terminal has 4 channels. The two data signal input terminals and the signal output terminal can be selected under the control of the control signal. By utilizing the two-input and one-output selection characteristics of the four-channel single-pole double-throw analog switch, the main control unit 210 controls the signal output by the selection unit 110 to be a synchronous audio signal b0 or an asynchronous audio signal a0, thereby realizing the automatic switching of the audio played during synchronous programs and asynchronous programs according to the program playback mode. Exemplarily, the selection unit 110 can be an ADG774 four-channel single-pole double-throw analog switch. In addition, referring to Figure 2 The output terminal D of the selection unit 110 includes a data signal output terminal D4 and a control signal output terminal D1-3. The selection unit 110 can receive a selection signal S1 to select the asynchronous audio signal input terminal A and the audio output terminal D, or select the synchronous audio signal input terminal B and the audio output terminal D.

[0036] Specifically, in the asynchronous playback mode, the selection unit 110 selects the asynchronous control signal input terminal A1-3 and the control signal output terminal D1-3, as well as the asynchronous data signal input terminal A4 and the data signal output terminal D4 according to the selection signal S1, and outputs the asynchronous control signal a1-3a from the control signal output terminal D1-3, and outputs the asynchronous serial data signal a4 from the data signal output terminal D4; in the synchronous playback mode, the selection unit 110 is used to select the synchronous control signal input terminal B1-3 and the control signal output terminal D1-3, as well as the synchronous data signal input terminal B4 and the data signal output terminal D4 according to the selection signal S1, and outputs the synchronous control signal b1-3 from the control signal output terminal D1-3, and outputs the synchronous serial data signal b4 from the data signal output terminal D4. When switching between synchronous and asynchronous playback modes, the main control unit 210 sends a selection signal S1 to the selection signal input terminal SWT of the selection unit 110. When the selection signal S1 controls the selection unit 110 to select the asynchronous audio signal input terminal A and the audio output terminal D, the asynchronous control signal input terminal A1-3 and the control signal output terminal D1-3 are selected, the asynchronous data signal input terminal A4 and the data signal output terminal D4 are selected, the asynchronous control signal a1-3a is output from the control signal output terminal D1-3, and the asynchronous serial data signal a4 is output from the data signal output terminal D4. When the synchronous audio signal input terminal B and the audio output terminal D are selected, the synchronous control signal input terminal B1-3 and the control signal output terminal D1-3 are selected, the synchronous data signal input terminal B4 and the data signal output terminal D4 are selected, the synchronous control signal b1-3 is output from the control signal output terminal D1-3, and the synchronous serial data signal b4 is output from the data signal output terminal D4, so as to select different input terminals and output terminals of the selection unit 110 according to the selection signal S1. At the same time, the main control unit 210 can control the display screen to play the program screen corresponding to the audio signal output by the audio output terminal D, so as to realize the automatic switching of the audio following the screen when the program is in the synchronous playback mode and the asynchronous playback mode, and to realize the playback of the audio of the same signal source following the current playback content, without the need to manually connect the corresponding audio to the audio playback device, so as to solve the problem that the audio cannot be automatically switched in the synchronous program playback and asynchronous playback modes, and the audio switching needs to be manually intervened.

[0037] It should be noted that the synchronous audio signal b0 and the asynchronous audio signal a0 in the embodiment of the present invention are both integrated circuit built-in audio signals (Inter-IC Sound, I2S), and the I2S signal includes a bit clock signal, a frame clock signal, a main clock signal and a serial data signal.

[0038] Optional, continue to refer to Figure 2, the asynchronous control signal input terminal A1-3 includes an asynchronous bit clock signal input terminal A1, an asynchronous frame clock signal input terminal A2 and an asynchronous master clock signal input terminal A3. The asynchronous bit clock signal input terminal A1, the asynchronous frame clock signal input terminal A2 and the asynchronous master clock signal input terminal A3 are used to input the asynchronous bit clock signal a1, the asynchronous frame clock signal a2 and the asynchronous master clock signal a3 respectively.

[0039] The synchronous control signal input terminal B1-3 includes a synchronous bit clock signal input terminal B1, a synchronous frame clock signal input terminal B2 and a synchronous master clock signal input terminal B3. The synchronous bit clock signal input terminal B1, the synchronous frame clock signal input terminal B2 and the synchronous master clock signal input terminal B3 are used to input the synchronous bit clock signal b1, the synchronous frame clock signal b2 and the synchronous master clock signal b3 respectively.

[0040] Among them, the asynchronous bit clock signal input terminal A1 is used to receive the asynchronous bit clock signal a1, the asynchronous frame clock signal input terminal A2 is used to receive the asynchronous frame clock signal a2, and the asynchronous master clock signal input terminal A3 is used to receive the asynchronous master clock signal a3. The synchronous bit clock signal input terminal B1 is used to receive the synchronous bit clock signal b1, the synchronous frame clock signal input terminal B2 is used to receive the synchronous frame clock signal b2, and the synchronous master clock signal input terminal B3 is used to receive the synchronous master clock signal b3. The asynchronous bit clock signal a1, the asynchronous frame clock signal a2, and the asynchronous master clock signal a3 all belong to the asynchronous control signal a1-3a, and the synchronous bit clock signal b1, the synchronous frame clock signal b2, and the synchronous master clock signal b3 all belong to the synchronous control signal b1-3. The control signal output terminal D1-3 includes a bit clock signal output terminal D1, a frame clock signal output terminal D2 and a master clock signal output terminal D3. Different types of clock signals can be transmitted through the asynchronous control signal input terminal A1-3 and the synchronous control signal input terminal B1-3. According to the selection signal S1, the asynchronous bit clock signal input terminal A1, the asynchronous frame clock signal input terminal A2, the asynchronous master clock signal input terminal A3 and the bit clock signal output terminal D1, the frame clock signal output terminal D2, and the master clock signal output terminal D3 are selected, or the synchronous bit clock signal input terminal B1, the synchronous frame clock signal input terminal B2, the synchronous master clock signal input terminal B3 and the bit clock signal output terminal D1, the frame clock signal output terminal D2, and the master clock signal output terminal D3 are selected, so that the various units of the synchronous and asynchronous audio playback devices can be better synchronized.

[0041] The technical solution of this embodiment utilizes the two-input and one-output gating characteristics of the four-channel single-pole double-throw analog switch, and controls the signal output by the gating unit 110 to be a synchronous audio signal b0 or an asynchronous audio signal a0 through the main control unit 210, thereby realizing the automatic switching of the audio played during synchronous programs and asynchronous programs with the program playback mode. This solves the problem that the audio cannot be automatically switched in the synchronous program playback and asynchronous playback modes, and manual intervention is required for audio switching.

[0042] In another embodiment of the present invention, the synchronous and asynchronous audio playback device of the present invention is improved on the basis of the above embodiment. Figure 3 A schematic diagram of the structure of another synchronous and asynchronous audio playback device provided by the embodiment of the utility model is shown as follows: Figure 3 As shown, optionally, the synchronous and asynchronous audio playback device also includes an audio and video conversion unit 310, the input end of the audio and video conversion unit 310 is used to obtain the multimedia signal; the synchronous audio signal output end of the audio and video conversion unit 310 is connected to the synchronous audio signal input end B; the audio and video conversion unit 310 is used to form a synchronous audio signal b0 according to the multimedia signal, and output the synchronous audio signal b0 through the synchronous audio signal output end.

[0043] The audio and video conversion unit 310 may be an audio and video conversion chip, which may convert the multimedia signal input from the HDMI input signal source into a synchronous audio signal b0. Exemplarily, the audio and video conversion chip may be an RK628 audio and video conversion chip.

[0044] Optionally, the video signal output end of the audio and video conversion unit 310 is connected to the video signal input end of the main control unit 210, and the audio and video conversion unit 310 is also used to form a video signal according to the multimedia signal and output the video signal through the video signal output end.

[0045] Specifically, the audio and video conversion unit 310 can convert the multimedia signal input by the HDMI input signal source into a synchronous audio signal b0 and a video signal, send the video signal that does not contain audio data to the main control unit 210, and transmit the synchronous audio signal b0 to the selection unit 110 via the I2S signal.

[0046] It should be noted that when the asynchronous playback mode is switched to the synchronous playback mode, the main control unit 210 sends a selection signal S1 to the selection signal input terminal SWT, selects the synchronous audio signal input terminal B and the audio output terminal D, and makes the selection unit 110 output the synchronous audio signal b0. At the same time, the video signal input terminal of the main control unit 210 receives the video signal, and controls the display screen of the display system where the main control unit 210 is located to play the video image contained in the video signal, thereby realizing the switching of the synchronous and asynchronous playback modes. During the switching process of the synchronous and asynchronous playback modes, the audio automatically switches with the image without manual intervention. In addition, in the synchronous playback mode, there is no need to manually connect the corresponding audio to the speaker, and no wiring is required.

[0047] Optional, such as Figure 3 As shown, the main control unit 210 also includes an asynchronous audio signal output terminal, which is connected to the asynchronous audio signal input terminal SWT; the main control unit 210 is also used to determine the asynchronous audio signal a0 according to the asynchronous video signal, and output the asynchronous audio signal a0 through the asynchronous audio signal output terminal.

[0048] Specifically, the asynchronous video signal in the main control unit 210 may be an asynchronous video signal in a storage unit connected to the main control unit 210. When the synchronous play mode is switched to the asynchronous play mode, the main control unit 210 may determine the asynchronous audio signal a0 according to the asynchronous video signal, and output the asynchronous audio signal a0 through the asynchronous audio signal output terminal, and at the same time send a selection signal S1 to the selection signal input terminal SWT, select the asynchronous audio signal input terminal A and the audio output terminal D, so that the selection unit 110 outputs the asynchronous audio signal a0, and at the same time the main control unit 210 controls the display screen of the display system where the main control unit 210 is located to play the video picture contained in the asynchronous video signal, thereby realizing the switching of the synchronous and asynchronous play modes. In the synchronous and asynchronous play mode switching process, the audio automatically switches with the picture without manual intervention.

[0049] Optional, such as Figure 3 As shown, the synchronous and asynchronous audio playback device also includes a digital-to-analog conversion unit 410, the input end of the digital-to-analog conversion unit 410 is connected to the audio output end D of the selection unit 110, and the digital-to-analog conversion unit 410 is used to convert the asynchronous audio signal a0 or the synchronous audio signal b0 into an audio analog signal.

[0050] Among them, Figure 3As shown, the asynchronous audio signal a0 and the synchronous audio signal b0 are both I2S signals, and the I2S signal is a digital signal. The digital-to-analog conversion unit 410 can be a digital-to-analog conversion chip, and exemplarily, the digital-to-analog conversion chip 410 is a WM8524GEDT digital-to-analog conversion chip. The digital-to-analog conversion unit 410 can convert the asynchronous audio signal a0 or the synchronous audio signal b0 into an audio analog signal, that is, the digital-to-analog conversion unit 410 can convert the I2S signal into an L / R audio analog signal, so that the audio playback device can play audio according to the L / R audio analog signal.

[0051] Specifically, Figure 4 The structure diagram of a digital-to-analog conversion unit provided by the embodiment of the utility model is shown in FIG. Figure 4 As shown, the digital-to-analog conversion chip 410 is a WM8524GEDT digital-to-analog conversion chip, the BCLK terminal of the digital-to-analog conversion chip 410 is connected to the bit clock signal output terminal D1 of the gating unit 110, and receives the signal output by the bit clock signal output terminal D1 of the gating unit 110, the LRCLK terminal of the digital-to-analog conversion chip 410 is connected to the frame clock signal output terminal D2 of the gating unit 110, and receives the signal output by the frame clock signal output terminal D2 of the gating unit 110, the MCLK terminal of the digital-to-analog conversion chip 410 is connected to the main clock signal output terminal D3 of the gating unit 110, and receives the signal output by the main clock signal output terminal D3 of the gating unit 110, and the MCLK terminal of the digital-to-analog conversion chip 410 is connected to the data signal output terminal D4 of the gating unit 110, and receives the data signal output by the data signal output terminal D4 of the gating unit 110. The MUTE end of the digital-to-analog conversion chip 410 is connected to the main control unit 210, and the main control unit 210 can control the operation of the digital-to-analog conversion chip 410. The MUTE end of the digital-to-analog conversion chip 410 can receive a high-level signal or a low-level signal from the main control unit 210, and the digital-to-analog conversion chip 410 works according to the level of the MUTE end. For example, when the MUTE end of the digital-to-analog conversion chip 410 is at a low level, the digital-to-analog conversion chip 410 is normally enabled to work, and when the MUTE end of the digital-to-analog conversion chip 410 is at a high level, the digital-to-analog conversion chip 410 is not enabled. When the digital-to-analog conversion unit 410 is normally enabled to work, the I2S signal at the input end can be converted into an L / R audio analog signal, so that the audio playback device can play audio according to the L / R audio analog signal.

[0052] Optional, such as Figure 3 As shown, the synchronous and asynchronous audio playback device further includes an audio output socket 510, the input end of the audio output socket 510 is connected to the output end of the digital-to-analog conversion unit 410, and the audio output socket 510 is used to receive and output audio analog signals.

[0053] The audio output socket 510 may be an audio interface that can be connected to an audio playback device. For example, the audio output socket 510 may be an audio interface of a 3.5 mm headphone jack, USB, Type-C, etc. The audio output socket 510 may receive an audio analog signal and send it to a device connected to the audio output socket 510.

[0054] Specifically, Figure 4 As shown, the LINEVOUTR and LINEVOURL ends of the digital-to-analog conversion chip 410 are both connected to the input end of the audio output socket 510. The LINEVOUTR and LINEVOURL ends of the digital-to-analog conversion chip 410 can output audio of different channels to the audio output socket 510, and the audio output socket 510 can be a 3.5mm headphone interface.

[0055] Optional, such as Figure 3 As shown, the synchronous and asynchronous audio playback apparatus further includes an audio playback device 610 , which is connected to the output interface of the audio output socket 510 , and is used to play audio according to the audio analog signal.

[0056] The audio playback device 610 may be a playback device such as a speaker or a loudspeaker. The audio playback device 610 may be connected to the output interface of the audio output socket 510, and receive an audio analog signal and convert the audio analog signal into audio for playback.

[0057] The embodiment of the utility model controls the audio signal output by the gating unit through the main control unit, and the main control unit controls the display screen of the display system where the main control unit is located to play the video picture contained in the video signal, thereby realizing the switching of the synchronous and asynchronous playback modes. In the synchronous and asynchronous playback mode switching process, the audio automatically switches with the picture without manual intervention. The problem that the audio cannot be automatically switched in the synchronous program playback and asynchronous playback modes and manual intervention is required for audio switching is solved.

[0058] The embodiment of the utility model further provides a multimedia playback device, comprising the synchronous and asynchronous audio playback device of any of the above embodiments.

[0059] Specifically, the multimedia playback device provided by the embodiment of the utility model includes the synchronous and asynchronous audio playback device proposed in any of the above embodiments, and has the same beneficial effects as the synchronous and asynchronous audio playback device proposed in the above embodiments, which will not be repeated here. Exemplarily, the multimedia playback device can be a television, a display device with television functions, an LED full-color control system playback box, and other multimedia playback devices.

[0060] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A synchronous and asynchronous audio playback device, characterized in that: It includes a gating unit and a main control unit; The gating unit comprises an asynchronous audio signal input terminal, a synchronous audio signal input terminal, a gating signal input terminal and an audio output terminal; the asynchronous audio signal input terminal is used to receive an asynchronous audio signal; the synchronous audio signal input terminal is used to receive a synchronous audio signal; The selection signal output terminal of the main control unit is connected to the selection signal input terminal, and the main control unit is used to send a selection signal to the selection signal input terminal; the selection unit is used to select the asynchronous audio signal input terminal and the audio output terminal, or select the synchronous audio signal input terminal and the audio output terminal according to the selection signal.

2. The synchronous and asynchronous audio playback device according to claim 1, characterized in that: The asynchronous audio signal input terminal includes an asynchronous data signal input terminal and an asynchronous control signal input terminal, the synchronous audio signal input terminal includes a synchronous data signal input terminal and a synchronous control signal input terminal, and the audio output terminal includes a data signal output terminal and a control signal output terminal; The asynchronous data signal input terminal is used to input an asynchronous serial data signal, and the asynchronous control signal input terminal is used to input an asynchronous control signal; the synchronous data signal input terminal is used to input a synchronous serial data signal, and the synchronous control signal input terminal is used to input a synchronous control signal; The gating unit is used to gating the asynchronous control signal input terminal and the control signal output terminal, and the asynchronous data signal input terminal and the data signal output terminal according to the gating signal; or, The gating unit is used for gating the synchronous control signal input terminal and the control signal output terminal, and the synchronous data signal input terminal and the data signal output terminal according to the gating signal.

3. The synchronous and asynchronous audio playback device according to claim 2, characterized in that: The asynchronous control signal input terminal comprises an asynchronous bit clock signal input terminal, an asynchronous frame clock signal input terminal and an asynchronous master clock signal input terminal; the asynchronous bit clock signal input terminal, the asynchronous frame clock signal input terminal and the asynchronous master clock signal input terminal are used to input the asynchronous bit clock signal, the asynchronous frame clock signal and the asynchronous master clock signal respectively; The synchronous control signal input end includes a synchronous bit clock signal input end, a synchronous frame clock signal input end and a synchronous master clock signal input end; the synchronous bit clock signal input end, the synchronous frame clock signal input end and the synchronous master clock signal input end are used to input the synchronous bit clock signal, the synchronous frame clock signal and the synchronous master clock signal respectively.

4. The synchronous and asynchronous audio playback device according to claim 1, characterized in that: It also includes an audio and video conversion unit, the input end of which is used to obtain multimedia signals; the synchronous audio signal output end of the audio and video conversion unit is connected to the synchronous audio signal input end; The audio-video conversion unit is used to form the synchronous audio signal according to the multimedia signal, and output the synchronous audio signal through the synchronous audio signal output terminal.

5. The synchronous and asynchronous audio playback device according to claim 4, characterized in that: The video signal output end of the audio-video conversion unit is connected to the video signal input end of the main control unit. The audio-video conversion unit is also used to form a video signal according to the multimedia signal and output the video signal through the video signal output end.

6. The synchronous and asynchronous audio playback device according to claim 1, characterized in that: The main control unit further comprises an asynchronous audio signal output terminal, wherein the asynchronous audio signal output terminal is connected to the asynchronous audio signal input terminal; The main control unit is further used to determine the asynchronous audio signal according to the asynchronous video signal, and output the asynchronous audio signal through the asynchronous audio signal output terminal.

7. The synchronous and asynchronous audio playback device according to claim 1, characterized in that: It also includes a digital-to-analog conversion unit, the input end of which is connected to the audio output end of the selection unit, and the digital-to-analog conversion unit is used to convert the asynchronous audio signal or the synchronous audio signal into an audio analog signal.

8. The synchronous and asynchronous audio playback device according to claim 7, characterized in that: It also includes an audio output socket, the input end of the audio output socket is connected to the output end of the digital-to-analog conversion unit, and the audio output socket is used to receive and output the audio analog signal.

9. The synchronous and asynchronous audio playback device according to claim 8, characterized in that: It also includes an audio playback device, which is connected to the output interface of the audio output socket and is used to play audio according to the audio analog signal.

10. A multimedia playback device, characterized in that: The synchronous and asynchronous audio playback device comprises any one of claims 1 to 9.

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