CN111866425A - Method for processing multimedia signal and multimedia device - Google Patents
Method for processing multimedia signal and multimedia device Download PDFInfo
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- CN111866425A CN111866425A CN201910334841.9A CN201910334841A CN111866425A CN 111866425 A CN111866425 A CN 111866425A CN 201910334841 A CN201910334841 A CN 201910334841A CN 111866425 A CN111866425 A CN 111866425A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005236 sound signal Effects 0.000 claims abstract description 65
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000007726 management method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010752 BS 2869 Class D Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/602—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for digital sound signals
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention provides a method for processing a multimedia signal and a multimedia device. The method comprises the following steps: receiving a first audio signal in the multimedia signal from a display device through a first transmission interface of a multimedia device; converting the first audio signal to generate a second audio signal suitable for a second transmission interface of the multimedia device; and outputting the second audio signal to an audio playing device through the second transmission interface for playing.
Description
Technical Field
The present invention relates to multimedia signals, and more particularly, to a method for processing a multimedia signal and a multimedia device.
Background
The High Definition Multimedia Interface (HDMI) association has established an Audio Return Channel (ARC) to allow Audio signals to be transmitted in different directions. Since the transmission speed of signals in the HDMI 2.1 standard is up to 12 gigabits per second (gigabits per second), the length of the HDMI cable is severely limited (e.g., about 2-3 meters at the maximum) without causing signal errors, which greatly limits the positions of the projector (or tv) and the amplifier. Therefore, a novel multimedia signal processing method and related multimedia device are needed to solve the problem of limited cable length.
Disclosure of Invention
An objective of the present invention is to provide a method and a multimedia device for processing a multimedia signal, so that the positions of a projector (or a television) and an amplifier are not limited by the length of an HDMI cable, thereby improving the user experience.
At least one embodiment of the present invention provides a method for processing a multimedia signal. The method comprises the following steps: receiving a first audio signal in the multimedia signal from a display device through a first transmission interface of a multimedia device; converting the first audio signal to generate a second audio signal suitable for a second transmission interface of the multimedia device; and outputting the second audio signal to an audio playing device through the second transmission interface for playing.
At least one embodiment of the present invention further provides a multimedia device. The multimedia device may include a first transmission interface, a second transmission interface, and a system chip, wherein the system chip includes a conversion circuit coupled between the first transmission interface and the second transmission interface. In operation of the multimedia device, the first transmission interface is configured to receive a first audio signal of a multimedia signal from a display device, and the second transmission interface is configured to output a second audio signal to an audio playing device for playing. The system chip can convert the first audio signal by using the conversion circuit to generate the second audio signal suitable for the second transmission interface.
After the multimedia device of the present invention converts the first audio signal into the second audio signal, the transmission distance of the second audio signal is less limited by the length of the HDMI cable. For example, the second transmission interface can be implemented by using a Universal Serial Bus (USB) interface to solve the problems encountered by using the HDMI cable in the related art. In addition, the embodiments of the present invention do not significantly increase the cost, and therefore, the present invention can solve the problems of the related art without side effects or with less side effects.
Drawings
Fig. 1 is a schematic diagram of a video system according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a video system according to an embodiment of the invention.
Fig. 3 is a flowchart of a method for processing a multimedia signal according to an embodiment of the invention.
Detailed Description
At least one embodiment of the present invention provides a multimedia device. The multimedia device can utilize a video decoding circuit therein to perform video decoding to generate video output signals, and the video output signals are transmitted to at least one video output device, such as a digital television, a projector and the like, through at least one HDMI cable. With the increasing performance of Digital televisions, smart TVs (smart TVs) have recently been available that run video applications (e.g., Youtube, Google Play, Netflix, etc.) that support higher-order sound effects (e.g., Dolby Digital and Digital cinema systems (DTS)). The multimedia device may support signal processing during execution of the video applications to allow a user to enjoy audio output from an audio output device coupled to the multimedia device.
Fig. 1 is a schematic diagram of a video system 10 according to an embodiment of the invention. The video system 10 may include a multimedia device 100, a display apparatus 200 and an audio playback apparatus 500, wherein examples of the display apparatus 200 may include, but are not limited to, display apparatuses without video application function such as a projector and a conventional digital television, and display apparatuses with video application function such as a smart television (smart TV), and examples of the audio playback apparatus 500 may include, but are not limited to, an audio playback apparatus in which a speaker and an amplifier are integrated into a single apparatus, and an audio playback system in which a speaker and an amplifier are connected. In some embodiments, the multimedia device 100 can be implemented in a television set top box (OTT box) or a television stick (stick) that is small in volume, although the invention is not limited thereto.
In the present embodiment, the multimedia device 100 may include a first transmission interface such as the HDMI interface 120, a video decoding circuit 130, a second transmission interface such as the USB interface 140, and a system-on-chip (SoC) 160, wherein the SoC 160 may include a conversion circuit 162 coupled between the HDMI interface 120 and the USB interface 140. The HDMI interface 120 allows the multimedia device 100 to be coupled to the display apparatus 200 via an HDMI cable, and the USB interface 140 allows the multimedia device 100 to be coupled to the audio playback device 500 via at least one USB (e.g., USB type-C) cable. In addition, in some embodiments, the system-on-a-chip 160 may further include one or more processing circuits (not shown) in addition to the conversion circuit 162 for executing various video applications (e.g., Youtube, google play, Netflix, etc.), but the invention is not limited thereto.
In the present embodiment, the audio playback apparatus 500 may include an audio amplifier 520 and a speaker 540 (e.g., a passive speaker) coupled to the audio amplifier 520, wherein the audio amplifier 520 may include an amplifier circuit 522, a digital-to-analog converter 524 coupled to the amplifier circuit 522, and a power management circuit 526 respectively coupled to the amplifier circuit 522 and the digital-to-analog converter 524. In the present embodiment, the digital-to-analog converter 524 can obtain a digital audio signal from the multimedia device 100 through the at least one USB cable, and perform digital-to-analog conversion on the digital audio signal to output an analog audio signal; then, the amplifier circuit 522 can amplify the analog audio signal to drive the analog audio signal to the speaker 540 for playing; but the invention is not limited thereto. In this embodiment, the power management circuit 526 can not only provide power to the amplifier circuit 522 and the DAC 524, but also provide power to the multimedia device 100 (such as the HDMI 120, the USB 140 and the SOC 160 therein) via the at least one USB cable. Therefore, the present invention provides a power separation design, such that the multimedia device 100 can obtain power (e.g., a USB power delivery function) from the power management circuit 526 of the audio playback device 500 through at least one USB cable for connecting the USB interface 140 and the audio playback device 500, so as to allow the multimedia device 100 to operate normally without a built-in power supply circuit, thereby reducing the required size.
In the present embodiment, each of the multimedia device 100 and the display apparatus 200 has a function of acquiring streaming data (e.g., streaming data including video data and audio data) from a streaming data source. For ease of understanding, the following description illustrates the display device 200 as an example of a smart electronic device. When the display apparatus 200 operates in a normal mode, the streaming data is obtained from the streaming data source (e.g., a remote server or the internet connected to the remote server) through the multimedia device 100 (e.g., the soc 160 therein), rather than the streaming data source through the display apparatus 200, wherein the soc 160 can utilize the video decoding circuit 130 to perform video decoding, and particularly, the HDMI interface 120 can be utilized to transmit the video data in the obtained streaming data to the display apparatus 200 for displaying, and the USB interface 140 can be utilized to transmit the audio data in the obtained streaming data to the audio playback apparatus 500 for playing. When the display apparatus 200 operates in a network mode, the streaming data is obtained from the streaming data source (e.g., a remote server or the internet connected to the remote server) through the display apparatus 200, rather than from the streaming data source through the multimedia device 100, wherein the soc 160 may receive a first Audio signal of a multimedia signal from the display apparatus 200 through an Audio Return Channel (ARC) or an enhanced ARC (eARC) of the HDMI interface 120 (e.g., the first Audio signal may carry Audio data in streaming data obtained by the display apparatus 200), the system-on-chip 160 can then convert the first audio signal by using a conversion circuit 162 therein to generate a second audio signal suitable for the (application) USB interface 140, and outputs the second audio signal to the audio playing device 500 through the USB interface 140 for playing.
In some embodiments, the conversion circuit 162 may include a decoder (not shown) to enable the multimedia device 100 to process not only uncompressed audio data but also compressed audio data. For example, when the first audio signal (e.g., the audio data in the streaming data acquired by the display device 200) is audio data in Dolby Digital or Digital cinema System (DTS) format, the decoder in the conversion circuit 162 may first decode (decompress) the audio data, and then convert the audio data into USB signal format for the USB interface 140 to output; for another example, when the first audio signal is uncompressed audio data, the conversion circuit 162 may skip the decoding step to directly convert the audio data into a USB signal format for output by the USB interface 140; but the invention is not limited thereto.
FIG. 2 is a schematic diagram of a video system 20 according to an embodiment of the invention, wherein the USB interface 140 of the multimedia device 100 can comprise a USB type C interface. The difference between this embodiment and the embodiment shown in fig. 1 is that the audio playback device 600 connected to the multimedia device 100 does not include the dac 524, but is implemented by only using the power management circuit, the amplifier circuit 522 (e.g., a class-D amplifier) and the speaker 540. Compared to the audio playback apparatus 500, the audio playback apparatus 600 receives an analog audio signal instead of a digital audio signal. In this embodiment, the USB interface 140 may determine (e.g., by detecting a voltage level corresponding to a resistance value) whether the audio playback apparatus 600 is an audio playback apparatus without a digital-to-analog converter (e.g., a passive audio playback apparatus) by detecting a set of input resistors (a set of resistors configured with a channel pin) of the audio playback apparatus 600 (amplifier circuit); if so, the USB interface 140 can operate in an audio adapter accessory mode (Audio adapter access mode) and output an analog audio signal to the audio playback device 600 for playback. For example, when the multimedia device 100 (such as the soc 160 and the USB interface 140 therein) operates in the audio adapter accessory mode, the conversion circuit 162 may utilize a digital-to-analog converter (not shown) therein to perform digital-to-analog conversion on the audio signal received from the display apparatus 200 to generate an analog audio signal, and then transmit the analog audio signal to the audio playback device 600 through the USB interface 140 for playback.
In practice, the multimedia device 100 is usually disposed in a close position to the display apparatus 200, limited by the length of the HDMI cable. However, depending on the user experience, an audio playback device may need to be configured at a specific distance from the display apparatus 200 (or the multimedia device 100). In the related art, the audio signal from the display device 200 may be transmitted by an optical fiber to overcome the limitation of the length of the HDMI cable, but the equipment used for the optical fiber transmission may be very expensive. Compared to the related art, the USB interface 140 of the multimedia device 100 provided by the present invention can connect a plurality of cables for connecting the USB interface 140 and the audio playback device (e.g., the audio playback device 500 shown in fig. 1) in series through at least one hub (hub) (e.g., one or more hubs) to increase a transmission distance of an audio signal (e.g., the second audio signal) between the multimedia device 100 and the audio playback device (e.g., the audio playback device 500 shown in fig. 1). For example, when the length of a single USB cable is not long enough to satisfy the requirement of a user to set up a video system, the user can use a hub to connect two USB cables in series (or use more than two hubs to connect more than three USB cables in series) to increase the transmission distance of audio signals, but the invention is not limited thereto.
Fig. 3 is a flowchart of a method for processing a multimedia signal (e.g., streamed data obtained by the display device 200 from a streamed data source in the above embodiment) according to an embodiment of the invention. For ease of understanding, please refer to fig. 3 in conjunction with fig. 1 or 2.
In step 310, a first transmission interface of the multimedia apparatus 100, such as the HDMI interface 120, receives a first audio signal of the multimedia signals from the display device 200. Specifically, the HDMI interface 120 can utilize an audio return channel or an enhanced audio return channel therein to receive the first audio signal.
In step 320, the multimedia device 100 (particularly, the conversion circuit 162 in the soc chip 160) converts the first audio signal to generate a second audio signal suitable for a second transmission interface of the multimedia device 100, such as the USB interface 140.
In step 330, the multimedia device 100 can output the second audio signal to an audio playing device through the second transmission interface for playing. Please note that, when the multimedia device 100 is coupled to the audio playback device 500 (as shown in FIG. 1), the second audio signal may comprise a digital audio signal; when the multimedia device 100 is coupled to the audio playback device 600 (as shown in fig. 2), the multimedia device 100 (e.g., the USB interface 140 therein) can operate in an audio adapter accessory mode, such that the second audio signal can comprise an analog audio signal.
To sum up, the method and the multimedia device (e.g., the multimedia device 100) provided by the present invention solve the problem caused by the insufficient length of the HDMI cable in the related art by converting the audio signal received by the HDMI interface 120 to be output through the USB interface 140. In addition, the USB interface 140 of the present invention is not only used for transmitting audio signals, but also used for obtaining power from the audio playback device, thereby implementing a power separation design and further reducing the size of the multimedia device 100. From the above, the present invention can significantly improve the user experience and solve the problems of the related art without or with less side effects.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
[ notation ] to show
10. 20 video system
100 multimedia device
120 HDMI interface
130 video decoding circuit
140 USB interface
160 system single chip microcomputer
162 switching circuit
200 display device
500. 600 audio playing device
520. 620 audio amplifier
522 amplifier circuit
524 digital-to-analog converter
526 power management circuit
540 video system
310. 320 and 330.
Claims (10)
1. A method for processing a multimedia signal, comprising:
receiving a first audio signal in the multimedia signal from a display device through a first transmission interface of a multimedia device;
converting the first audio signal to generate a second audio signal suitable for a second transmission interface of the multimedia device; and
the second audio signal is output to an audio playing device through the second transmission interface for playing.
2. The method of claim 1, wherein the first transmission interface comprises an HDMI, and the step of receiving the first audio signal from the display device via the first transmission interface comprises:
the first audio signal is received from the display device through an audio return channel or an enhanced audio return channel of the high-definition multimedia interface.
3. The method of claim 2, wherein the second transmission interface comprises a universal serial bus interface.
4. The method of claim 3, further comprising:
the plurality of cables for connecting the universal serial bus interface and the audio playing device are connected in series through at least one concentrator, so that the transmission distance of the second audio signal between the multimedia device and the audio playing device is increased.
5. The method of claim 3, further comprising:
the multimedia device is used for obtaining power from a power management circuit in the audio playing device through at least one cable for connecting the universal serial bus interface and the audio playing device.
6. The method of claim 3, wherein the USB interface comprises a USB type C interface, and the method further comprises:
in an audio adapter accessory mode of the usb type C interface, the second audio signal is output to the audio playback device for playback through the usb type C interface, wherein the second audio signal comprises an analog audio signal.
7. The method of claim 1, wherein each of the multimedia device and the display apparatus is capable of obtaining streamed data from a source of streamed data; and since the streaming data should be obtained from the streaming data source through the display device, rather than from the streaming data source through the multimedia device, the multimedia device obtains the audio data in the streaming data from the display device, wherein the first audio signal carries the audio data.
8. A multimedia device, comprising:
a first transmission interface for receiving a first audio signal of a multimedia signal from a display device;
a second transmission interface for outputting a second audio signal to an audio playing device for playing; and
and a system chip, including a conversion circuit coupled between the first transmission interface and the second transmission interface, wherein the system chip converts the first audio signal by using the conversion circuit to generate the second audio signal suitable for the second transmission interface.
9. The multimedia apparatus according to claim 8, wherein the first transmission interface comprises an HDMI, and the HDMI receives the first audio signal from the display device via an audio return channel or an enhanced audio return channel therein.
10. The multimedia device of claim 9, wherein the second transmission interface comprises a universal serial bus interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910334841.9A CN111866425A (en) | 2019-04-24 | 2019-04-24 | Method for processing multimedia signal and multimedia device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910334841.9A CN111866425A (en) | 2019-04-24 | 2019-04-24 | Method for processing multimedia signal and multimedia device |
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| CN111866425A true CN111866425A (en) | 2020-10-30 |
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| CN201910334841.9A Pending CN111866425A (en) | 2019-04-24 | 2019-04-24 | Method for processing multimedia signal and multimedia device |
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2019
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| CN104243428A (en) * | 2013-06-19 | 2014-12-24 | 毛奇骅 | Media transmitting and playing method and system |
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