CN103581632A - Audio and video transmission circuit, audio and video transmission system and audio and video output device - Google Patents
Audio and video transmission circuit, audio and video transmission system and audio and video output device Download PDFInfo
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- CN103581632A CN103581632A CN201310493740.9A CN201310493740A CN103581632A CN 103581632 A CN103581632 A CN 103581632A CN 201310493740 A CN201310493740 A CN 201310493740A CN 103581632 A CN103581632 A CN 103581632A
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Abstract
The invention discloses an audio and video transmission circuit, an audio and video transmission system and an audio and video output device. The audio and video transmission circuit comprises a pair of universal serial bus differential signal lines and a pair of mobile high-definition link differential signal lines, wherein one end of each USB differential signal line is connected with the audio and video output device, and the other end of each USB differential signal line is connected with an audio and video receiving device; one end of each MHL differential signal line is connected with the audio and video output device, and the other end of each MHL differential signal line is connected with the audio and video receiving device. The audio and video output device comprises the audio and video transmission circuit. The audio and video transmission system comprises the audio and video output device, the audio and video receiving device and the audio and video transmission circuit. According to the scheme, inherent defects of MHL interfaces are overcome, and therefore the audio and video output device and the audio and video displaying and receiving device which perform audio and video transmission through MHL have two-way information transmission capacity, and the application field of the MHL interfaces is widened.
Description
Technical field
The present invention relates to the fields such as audio video transmission equipment and consumer electronics product, particularly a kind of audio video transmission circuit and system and a kind of audio frequency and video output equipment.
Background technology
In MHL interface, the equipment of output sound video is called to Source equipment, the equipment that receives audio frequency and video is called to Sink equipment.Traditional MHL interface circuit only has the function of the audio frequency and video one-way transmission from Source equipment to Sink equipment.Along with the progress of technology, the inevitable intelligent direction development towards thering is interactive capability of high-end consumption electronic product.The limitation of tradition MHL circuit is that Sink equipment can only mechanically receive the audio-video signal that comes from Source equipment, and cannot return audio signal, cannot meet the demand of designing and developing of high-end project, this has restricted the spread of MHL technology in consumer electronics field.For example: the high-end game machine with virtual reality ability of certain money requires Source equipment to have the ability of carrying out real-time information interaction with Sink equipment, to pursue more perfect, more real user, experience, this also just requires Sink equipment must have certain audio-frequency information passback ability.In this case, only rely on traditional MHL interface cannot meet development requirement.
Summary of the invention
In view of the above problems, the invention provides a kind of overcome the problems referred to above or a kind of audio video transmission circuit addressing the above problem at least in part and system and a kind of audio frequency and video output equipment.
For achieving the above object, technical scheme of the present invention is achieved in that
According to an aspect of the present invention, a kind of audio video transmission circuit, this circuit comprises: a pair of general-purpose serial bus USB differential signal line is connected MHL differential signal line with a pair of mobile high definition.One end of every USB differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment.One end of every MHL differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment.
A pair of MHL differential signal line is for being transferred to audio/video reception equipment by the audio-video signal of audio frequency and video output equipment.
A pair of USB differential signal line is for returning to audio frequency and video output equipment by the audio signal of audio/video reception equipment.
Alternatively, this circuit also comprises common-mode filter FL1 and common-mode filter FL2; Common-mode filter FL1 is connected in described a pair of USB differential signal line.Common-mode filter FL2 is connected in described a pair of MHL differential signal line.
Alternatively; this circuit also comprises static discharge esd protection device, esd protection device comprise the esd protection chip that a pair of USB differential signal line and a pair of MHL differential signal line share or be separately positioned on a pair of USB differential signal line and a pair of MHL differential signal line on esd protection element.
Alternatively, common-mode filter FL1 is for the common-mode noise of 100MHz, and its common code impedance is 90ohm.Common-mode filter FL2 is for the common-mode noise of 100MHz, and its common code impedance is 45ohm.
What alternatively, common-mode filter FL1 was used is the common-mode filter of ACM2012D-900-2P model.What common-mode filter FL2 was used is the common-mode filter of DLP11RN450UL2B model.What static discharge esd protection device used is the electrostatic discharge (ESD) protection device of RCLAMP0524J.TCT model.
According to another aspect of the present invention, a kind of audio frequency and video output equipment and a kind of audio-video transmission system; This audio frequency and video output equipment comprises the audio video transmission circuit described in one aspect of the invention.
, this system comprises: the audio video transmission circuit described in audio frequency and video output equipment, audio/video reception equipment and one aspect of the invention.One end of every USB differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment; One end of every MHL differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment.A pair of MHL differential signal line is for being transferred to audio/video reception equipment by the audio-video signal of audio frequency and video output equipment.A pair of USB differential signal line is for returning to audio frequency and video output equipment by the audio signal of audio/video reception equipment.
Alternatively, the audio frequency and video output equipment described in this system comprises that processor, usb bus, MHL bus, described audio video transmission circuit are integrated in described audio frequency and video output equipment; One end of usb bus is connected with processor, and the other end is connected into described audio video transmission circuit.One end of MHL bus is connected with processor, and the other end is connected into described audio video transmission circuit.
Alternatively, described in this system, audio/video reception equipment comprises processor, interface circuit, usb bus, MHL bus and microphone; One end of usb bus is connected with described processor, and the other end is connected with described interface circuit.One end of MHL bus is connected with described processor, and the other end is connected with described interface circuit.Microphone is connected with processor, for received audio signal.
Technical scheme of the present invention has made up the inherent shortcoming of MHL interface, makes to be undertaken having between the audio frequency and video output of audio video transmission and display device by MHL the ability of bidirectional transfer of information, has widened the application of MHL interface.Compare with the product based on traditional MHL interface circuit, the outstanding advantages of the product based on the technical program is that the intellectuality of the man-machine interaction of product is experienced more perfect.
Accompanying drawing explanation
Fig. 1 is the audio video transmission circuit diagram in one embodiment of the invention;
Fig. 2 is esd protection device and USB differential signal line and MHL in one embodiment of the invention
The schematic diagram of differential signal line annexation;
Fig. 3 is audio-video transmission system schematic diagram in one embodiment of the invention;
Fig. 4 is audio video transmission circuit hardware design drawing in one embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Core concept of the present invention is the deficiency for current MHL interface, taken into full account USB (Universal Serial Bus, abbreviation USB) advantage of interface, a kind of circuit design scheme that realizes audio video transmission based on USB has been proposed, the technical program not only can be accomplished the high resolution audio and video transmission from Source equipment to Sink equipment, can also realize the audio signal passback from Sink equipment to Source equipment.
Fig. 1 is the audio video transmission circuit diagram in one embodiment of the invention, and referring to Fig. 1, this audio video transmission circuit comprises that a pair of general-purpose serial bus USB differential signal line is connected MHL differential signal line with a pair of mobile high definition; One end of every USB differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment.One end of every MHL differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment.A pair of MHL differential signal line MHL_D and MHL_DB are for being transferred to audio/video reception equipment by the audio-video signal of audio frequency and video output equipment.A pair of USB differential signal line USB_D+ and USB_D-are for returning to audio frequency and video output equipment by the audio signal of audio/video reception equipment.
Referring to Fig. 1, further, in order to eliminate the interference of common-mode noise to USB differential signal line and MHL differential signal line, this audio video transmission circuit also comprises common-mode filter FL1 and common-mode filter FL2.Common-mode filter FL1 is connected in a pair of USB differential signal line USB_D+ and USB_D-; Common-mode filter FL2 is connected in a pair of MHL differential signal line MHL_D and MHL_DB.
Referring to Fig. 1; further; for protective circuit; prevent that the static in circuit from damaging circuit; this circuit also comprises: static discharge (Electro-Static discharge; be called for short ESD) protector, the esd protection chip that a pair of USB differential signal line and a pair of MHL differential signal line share.
Particularly; one end of USB differential signal line USB_D+, one end of USB_D-are connected with audio frequency and video output equipment respectively; the other end of USB differential signal line USB_D+, the other end of USB_D-are in series with common-mode filter FL1 respectively; common-mode filter FL1 and the series connection of esd protection device; USB differential signal line USB_D+, USB_D-access common-mode filter FL1; after filtering; USB differential signal line USB_D+, USB_D-, by the corresponding port access of esd protection device esd protection device, export and are connected with audio/video reception equipment through the corresponding ports of esd protection device.
One end of MHL differential signal line MHL_D, one end of MHL_DB are connected with audio frequency and video output equipment respectively; the other end of MHL differential signal line MHL_D, the other end of MHL_DB are connected with common-mode filter FL2; common-mode filter FL2 and esd protection device are in series; MHL differential signal line MHL_D, MHL_DB access common-mode filter FL2; after filtering; MHL differential signal line MHL_D, MHL_DB access esd protection device by the corresponding port of esd protection device, and are connected with audio/video reception equipment by the corresponding ports output of esd protection device.
Fig. 2 is the schematic diagram of esd protection element and USB differential signal line and MHL differential signal line annexation in one embodiment of the invention;
In other embodiments of the invention, for protective circuit, prevent that the static in circuit from damaging circuit, on a pair of USB differential signal line He on a pair of MHL differential signal line, esd protection element is set respectively.
Referring to Fig. 2; one end of USB differential signal line USB_D+, one end of USB_D-are connected with audio frequency and video output equipment respectively; the other end of USB differential signal line USB_D+, the other end of USB_D-are in series with common-mode filter FL1 respectively; common-mode filter FL1 and esd protection element ESD1, ESD2 series connection; USB differential signal line USB_D+, USB_D-access common-mode filter FL1; after filtering; USB differential signal line USB_D+ is connected with one end of ESD1 simultaneously, and one end of USB_D+ is also connected with audio/video reception equipment.The other end ground connection of ESD1 protection component.One end of USB differential signal line USB_D-and ESD2 is connected, and one end of USB_D-is also connected with audio/video reception equipment simultaneously.One end of MHL differential signal line MHL_D, one end of MHL_DB are connected with audio frequency and video output equipment respectively; the other end of MHL differential signal line MHL_D, the other end of MHL_DB are connected with common-mode filter FL2; common-mode filter FL2 and esd protection element ESD3, ESD4 are in series; MHL differential signal line MHL_D, MHL_DB access common-mode filter FL2; after filtering; MHL differential signal line MHL_D is connected with one end of esd protection element ESD3, and one end of MHL differential signal line MHL_D is also connected with audio frequency and video output equipment.One end of MHL differential signal line MHL_DB is connected with one end of esd protection element ESD4, and meanwhile, one end of MHL_DB is also connected with audio frequency and video output equipment.
In one embodiment of the invention, consider the factors such as common-mode signal that whether have use in the bandwidth of processor, USB and MHL of audio frequency and video output equipment and USB and the transmission of MHL signal, USB differential signal line and MHL differential signal line are provided with respectively to common-mode filter FL1 and common-mode filter FL2.
The effect of common-mode filter is to suppress the interference of common-mode noise to MHL in circuit and usb signal transmission, improves the accuracy of MHL and usb signal transmission.In one embodiment of the invention, what common-mode filter FL1 was used is ACM2012D-900-2P common-mode filter, and for the common-mode noise of 100MHz, the common code impedance of common-mode filter FL1 is 90ohm.In one embodiment of the invention, what common-mode filter FL2 was used is DLP11RN450UL2B common-mode filter, and for the common-mode noise of 100MHz, the common code impedance of common-mode filter FL2 is 45ohm, and this common code impedance may have 25% upper and lower error.
In Fig. 1, this audio video transmission circuit is also provided with an esd protection device, and its effect is to prevent the injury of static to circuit, the stability of intensifier circuit.Due to what transmit on four differential signal lines in this audio video transmission circuit, it is all high-speed differential signal; in order to guarantee the integrality of signal transmission; this just requires the parasitic capacitance of the input and output I/O pin of esd protection device to be less than 0.3 pico farad; therefore; what in one embodiment of the invention, esd protection device used is the electrostatic discharge (ESD) protection device of RCLAMP0524J.TCT model.Alternatively, in Fig. 2, this audio video transmission circuit adopts, on a pair of USB differential signal line and MHL differential signal line, esd protection element is set respectively, reaches the object of high speed signal electrostatic defending.
According to another aspect of the present invention, a kind of audio frequency and video output equipment and a kind of audio-video transmission system are provided.This audio frequency and video output equipment comprises the audio frequency and video output circuit described in aforementioned one aspect of the invention, and this audio frequency and video output circuit is a part of audio frequency and video output equipment.This audio video transmission circuit comprises that a pair of general-purpose serial bus USB differential signal line, a pair of mobile high definition connect MHL differential signal line, common-mode filter FL1, common-mode filter FL2 and static discharge esd protection device.
This audio-video transmission system comprises the audio video transmission circuit described in audio frequency and video output equipment, audio/video reception equipment and one aspect of the invention.
Fig. 3 is audio-video transmission system schematic diagram in one embodiment of the invention, and referring to Fig. 3, this audio-video transmission system comprises the audio video transmission circuit described in audio frequency and video output equipment, audio/video reception equipment and one aspect of the invention.Audio frequency and video output equipment in this audio-video transmission system is connected by connection cable with audio/video reception equipment.
Referring to Fig. 3, the audio frequency and video output equipment in this audio-video transmission system comprises processor, usb bus, MHL bus and audio video transmission circuit.Usb bus in this audio frequency and video output equipment accesses that a pair of differential signal line USB_D+, the USB_D-in audio video transmission circuit.MHL bus accesses that a pair of differential signal line MHL_D, the MHL_DB in audio video transmission circuit.One end of usb bus is connected with the processor of audio frequency and video output equipment, other end access audio video transmission circuit.One end of MHL bus is connected with the processor of audio frequency and video output equipment, other end access audio video transmission circuit.
Referring to Fig. 3, audio/video reception equipment comprises processor, interface circuit, usb bus, MHL bus and microphone.One end of usb bus is connected with the processor of audio/video reception equipment, and the other end is connected with interface circuit; One end of MHL bus is connected with the processor of audio/video reception equipment, and the other end is connected with interface circuit.The processor of microphone and audio/video reception equipment is connected, for received audio signal.
Referring to Fig. 3; audio video transmission circuit shown in one aspect of the invention is integrated in Fig. 3 middle pitch picture output device, and this audio video transmission circuit comprises that a pair of general-purpose serial bus USB differential signal line, a pair of mobile high definition connect MHL differential signal line, common-mode filter FL1, common-mode filter FL2 and static discharge esd protection device.
When audio frequency and video output equipment is during to audio/video reception equipment transmission of video, the processor of audio frequency and video output equipment is passed to audio video transmission circuit by audio-video signal through MHL bus, MHL differential signal line MHL_D in audio video transmission circuit and MHL_DB are used high speed TMDS(transmission minimum differential signal) high-definition video signal is transmitted, by connection cable, realize the transmission of the HD video from audio frequency and video output equipment to audio/video reception equipment.
Referring to Fig. 3, when realizing audio/video reception equipment to the audio return of audio frequency and video output equipment, the processor of audio/video reception equipment passed to the audio signal collecting by the microphone of audio/video reception equipment, this processor carries out sample code voice signal, USB is a kind of transmitted in both directions agreement, in Fig. 3, adopted four-headed arrow to represent, and MHL can only be from Source equipment to Sink equipment.Therefore adopt unidirectional arrow to represent in Fig. 3.But, in technical scheme of the present invention, only need to, when audio frequency passes back to Source equipment from Sink equipment, use usb protocol to carry out the transmission of audio signal.
By connection cable, be connected with audio frequency and video output equipment, the audio video transmission circuit that audio signal transmission connects to audio frequency and video output equipment, USB differential signal line USB_D+ in audio video transmission circuit and USB_D-are used the reverse non-return-to-zero coding of NRZI() this audio signal is passed to the processor of audio frequency and video output equipment through usb bus, realize the passback of audio signal from audio/video reception equipment to audio frequency and video output equipment.By the way, technical scheme provided by the invention makes Sink equipment have certain audio-frequency information passback ability, made up the inherent shortcoming of MHL interface, make to be undertaken having between the audio frequency and video output equipment of audio video transmission and display device by MHL the ability of bidirectional transfer of information, widened the application of MHL interface.
Fig. 4 is audio video transmission circuit hardware design drawing in one embodiment of the invention, and in one embodiment of the invention, audio video transmission circuit comprises that a pair of USB differential signal line is connected MHL differential signal line with a pair of mobile high definition.USB differential signal line USB0_D-inputs by the port one of common-mode filter FL1, after filtering, through port 2 outputs.USB differential signal line USB0_D+ is by port 3 inputs of common-mode filter FL1, after filtering, through port 4 outputs.MHL differential signal line MHL_DB0 inputs by the port one of common-mode filter FL2, after filtering, through port 2 outputs.MHL differential signal line MHL_D0 is by port 3 inputs of common-mode filter FL2, after filtering, through port 4 outputs.
USB differential signal line USB0_D+ inputs by the port one of static discharge esd protection device after port 4 outputs of common-mode filter FL1, through 10 outputs of the corresponding port of esd protection device.
USB differential signal line USB0_D-by port 2 inputs of static discharge esd protection device, exports through the corresponding port 9 of esd protection device after port 2 outputs of common-mode filter FL1.
MHL differential signal line MHL_D0 by port 4 inputs of static discharge esd protection device, exports through the corresponding port 7 of esd protection device after port 4 outputs of common-mode filter FL2.
MHL differential signal line MHL_DB0 by port 5 inputs of static discharge esd protection device, exports through the corresponding port 6 of esd protection device after port 2 outputs of common-mode filter FL2.
The port 3 of esd protection device and port 8 are grounding ports.
In sum, technical scheme of the present invention provide a kind of audio video transmission circuit and system and a kind of audio frequency and video output equipment in order to make up use MHL interface to carry out between the equipment of transmission of video can only one-way transmission video and inherent shortcoming that cannot back information, make carry out the audio frequency and video output equipment of audio video transmission and show the ability between receiving equipment with bidirectional transfer of information by MHL, widened the application of MHL interface.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., be all included in protection scope of the present invention.
Claims (9)
1. an audio video transmission circuit, is characterized in that, this circuit comprises: a pair of general-purpose serial bus USB differential signal line is connected MHL differential signal line with a pair of mobile high definition;
One end of described every USB differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment;
One end of described every MHL differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment;
Described a pair of MHL differential signal line is for being transferred to audio/video reception equipment by the audio-video signal of audio frequency and video output equipment;
Described a pair of USB differential signal line is for returning to audio frequency and video output equipment by the audio signal of audio/video reception equipment.
2. circuit as claimed in claim 1, is characterized in that, this circuit also comprises: common-mode filter FL1 and common-mode filter FL2;
Described common-mode filter FL1 is connected in described a pair of USB differential signal line;
Described common-mode filter FL2 is connected in described a pair of MHL differential signal line.
3. circuit as claimed in claim 2; it is characterized in that; this circuit also comprises: static discharge esd protection device, described esd protection device comprise the esd protection chip that described a pair of USB differential signal line and described a pair of MHL differential signal line share or be separately positioned on described a pair of USB differential signal line and described a pair of MHL differential signal line on esd protection element.
4. circuit as claimed in claim 3, is characterized in that,
Described common-mode filter FL1 is for the common-mode noise of 100MHz, and its common code impedance is 90ohm;
Described common-mode filter FL2 is for the common-mode noise of 100MHz, and its common code impedance is 45ohm.
5. circuit as claimed in claim 4, is characterized in that, what described common-mode filter FL1 was used is the common-mode filter of ACM2012D-900-2P model;
What described common-mode filter FL2 was used is the common-mode filter of DLP11RN450UL2B model;
What described static discharge esd protection device used is the electrostatic discharge (ESD) protection device of RCLAMP0524J.TCT model.
6. an audio frequency and video output equipment, is characterized in that, this equipment comprises the audio video transmission circuit as described in any one in claim 1-5.
7. an audio-video transmission system, is characterized in that, this system comprises: audio frequency and video output equipment, audio/video reception equipment and audio video transmission circuit; This audio video transmission circuit comprises: a pair of general-purpose serial bus USB differential signal line is connected MHL differential signal line with a pair of mobile high definition;
One end of described every USB differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment;
One end of described every MHL differential signal line is connected with audio frequency and video output equipment, and the other end is connected with audio/video reception equipment;
Described a pair of MHL differential signal line is for being transferred to audio/video reception equipment by the audio-video signal of audio frequency and video output equipment;
Described a pair of USB differential signal line is for returning to audio frequency and video output equipment by the audio signal of audio/video reception equipment.
8. system as claimed in claim 7, is characterized in that, audio frequency and video output equipment comprises processor, usb bus, MHL bus described in this system; Described audio video transmission circuit is integrated in described audio frequency and video output equipment;
One end of described usb bus is connected with processor, and the other end is connected into described audio video transmission circuit;
One end of described MHL bus is connected with processor, and the other end is connected into described audio video transmission circuit.
9. system as claimed in claim 7, is characterized in that, described audio/video reception equipment comprises processor, interface circuit, usb bus, MHL bus and microphone;
One end of described usb bus is connected with described processor, and the other end is connected with described interface circuit;
One end of described MHL bus is connected with described processor, and the other end is connected with described interface circuit;
Described microphone is connected with processor, for received audio signal.
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| CN201310493740.9A CN103581632A (en) | 2013-10-18 | 2013-10-18 | Audio and video transmission circuit, audio and video transmission system and audio and video output device |
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| CN201310493740.9A CN103581632A (en) | 2013-10-18 | 2013-10-18 | Audio and video transmission circuit, audio and video transmission system and audio and video output device |
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