CN102737680A - Method for realizing high-definition audio input and power amplifier equipment - Google Patents
Method for realizing high-definition audio input and power amplifier equipment Download PDFInfo
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- CN102737680A CN102737680A CN2012101594455A CN201210159445A CN102737680A CN 102737680 A CN102737680 A CN 102737680A CN 2012101594455 A CN2012101594455 A CN 2012101594455A CN 201210159445 A CN201210159445 A CN 201210159445A CN 102737680 A CN102737680 A CN 102737680A
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Abstract
The invention relates to a method for realizing high-definition audio input and power amplifier equipment. The method for realizing high-definition audio input comprises the following steps: reading EDID information of the receiving equipment; analyzing the EDID information, judging whether the receiving equipment is digital video interface equipment, if so, modifying a first data block in the EDID information, adding a data block for storing audio format information supported by the power amplifier equipment, if not, analyzing the audio format information supported by the receiving equipment of a second data block in the EDID information, and modifying the audio format information supported by the receiving equipment in the second data block into the audio format information supported by the power amplifier equipment; and transmitting the modified EDID information to the input source equipment. According to the method and the power amplifier equipment for realizing high-definition audio input, the high-definition audio can be input by adopting the low-channel power amplifier equipment with lower cost, and the cost is reduced.
Description
Technical field
The present invention relates to the Audiotechnica field, particularly relate to a kind of method and power amplifying device of realizing the high definition audio input.
Background technology
HDMI (High Definition Multimedia Interface, HDMI) is the standard that is exclusively used in digital video/audio transmission that HDMI organizes to set up.The HDMI interface can transmit sound signal and the high definition video signal that does not have compression in a transmission cable.Because of HDMI supports the digital audio/video transmission, bring high-quality seeing and hearing enjoyment to users, so HDMI more and more receives users' favor.
Traditional most DVD player or BD (blue-ray DVD) player all have the HDMI interface; HDMI input port that can be through the AV power amplifying device inserts sound signal and obtains acoustics true to nature after handling through power amplifying device, but to need the AV power amplifying device be 7.1 passages and have Dolby (Doby) TrueHD decoding capability.And 7.1 passages and to have a cost of AV power amplifying device of Dolby True HD decoding capability higher; If adopt the AV power amplifying device of 5.1 passages even 2.1 passages and the Dolby digital signal of can only decoding to insert the high definition audio signal, may not export or have only noise output.Therefore, hope can realize the input of high definition audio at lower cost.
Summary of the invention
Based on this, be necessary to provide a kind of method of lower-cost realization high definition audio input.
A kind of method that realizes the high definition audio input may further comprise the steps:
Read the EDID information of receiving equipment;
Resolve said EDID information; Judge whether said receiving equipment is digital video interface device, if then revise first data block in the said EDID information; And the newly-increased data block that is used to store the audio format information that power amplifying device supports; If not, then resolve the audio format information that the receiving equipment of second data block in the said EDID information is supported, and be the audio format information that power amplifying device is supported the audio format information correction that the receiving equipment in said second data block is supported;
Give input source equipment with amended EDID information transmission.
Among embodiment, the step of first data block in the said EDID information of said modification is specially therein:
The extension flag position of first data block in the said EDID information is rewritten as 1, and revises the summation validation value of first data block.
Therein among embodiment, said give the step of input source equipment with amended said EDID information transmission before, also comprise step:
Whether the HPD pin that detects input source equipment is effective, if, then give said input source equipment with amended said EDID information transmission, if not, whether the HPD pin that then continues detection input source equipment is effective.
Therein among embodiment, before the step of the said EDID information that reads receiving equipment, also comprise step:
Whether the HPD pin that detects receiving equipment is effective, if then read the EDID information of receiving equipment.
Among embodiment, also comprise step therein: when the HPD pin that detects receiving equipment is invalid, read the EDID information of the support audio format of acquiescence, effectively whether the HPD pin that gets into said detection input source equipment then step.
In addition, also be necessary to provide a kind of lower-cost power amplifying device.
A kind of power amplifying device comprises the HDMI trunk module, and said HDMI trunk module comprises:
Reading unit is used to read the EDID information of receiving equipment;
Resolution unit is used to resolve said EDID information, judges whether said receiving equipment is digital video interface device;
The change unit; Be used for when judging said receiving equipment and be digital video interface device; Revise first data block in the said EDID information; And the newly-increased data block that is used to store the audio format information that power amplifying device supports; And judging said receiving equipment for digital video interface device and after parsing the audio format information that the receiving equipment of second data block in the said EDID information supports, the audio format information correction that the receiving equipment in said second data block is supported is the audio format information that power amplifying device is supported;
Transmission unit is used for giving input source equipment with amended EDID information transmission.
Among embodiment, said change unit also is used for the extension flag position of first data block of said EDID information is rewritten as 1, and revises the summation validation value of first data block therein.
Among embodiment, said HDMI trunk module also comprises therein:
Detecting unit, whether the HPD pin that is used to detect input source equipment is effective;
Said transmission unit also is used for when the HPD pin that detects input source equipment is effective, gives said input source equipment with amended said EDID information transmission.
Therein among embodiment, whether said detecting unit also is used to detect the HPD pin of receiving equipment effective; Said reading unit also is used for when the HPD pin that detects receiving equipment is effective, reading the EDID information of said receiving equipment.
Among embodiment, whether said reading unit also is used for when the HPD pin that detects receiving equipment is invalid, reading the EDID information of the support audio format of acquiescence, and then effective by the HPD pin of said detection input source equipment therein.
The method and the power amplifying device of above-mentioned realization high definition audio input; After reading the EDID information of receiving equipment; Data block in the EDID information of receiving equipment is rewritten; The audio format information correction that the receiving equipment of second data block is supported is the audio format information that power amplifying device is supported, or the data block of the audio format information supported of newly-increased storage power amplifying device, gives input source equipment with amended EDID information transmission then; Input source equipment is decoded to high-definition multimedia according to the audio format information in the amended EDID information and is obtained the audio frequency that power amplifying device is supported; The 7.1 passage power amplifying devices that do not need expensive support high definition audio adopt the power amplifying device of lower-cost 5.1 passage power amplifying devices or lower passage also can realize the input to high definition audio, have reduced cost.
Description of drawings
Fig. 1 is a process flow diagram of realizing the method for high definition audio input among the embodiment;
Fig. 2 is a process flow diagram of realizing the method for high definition audio input among another embodiment;
Fig. 3 is the inner structure synoptic diagram of power amplifying device among the embodiment;
Fig. 4 is the inner structure synoptic diagram of power amplifying device among another embodiment.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment method and the power amplifying device of realizing the high definition audio input carried out detailed description, so that it is clearer.
As shown in Figure 1, in one embodiment, a kind of method that realizes the high definition audio input may further comprise the steps:
Step S110 reads the EDID information of receiving equipment.
Concrete; EDID (Extended Display Identification Data; The extending display identification data) be a kind of VESA (Video Electronics Standards Association; Video electronics standard) standard data format; The parameter that wherein comprises relevant monitor and performance thereof, it comprises, and supplier information, maximum image size, color settings, manufacturer pre-set, the character string of the restriction of frequency range, the audio frequency and video format information of being supported, the code stream form of being supported, port number, maximum SF, loudspeaker layout and display name and sequence number etc.Above-mentioned information is kept in the display joint, is used for communicating through a DDC (Display Data Channel, DDC) and system, and this communication is carried out between display and PC EGA.EDID can use in displays such as CRT, LCD.In the present embodiment, receiving equipment can be TV or other receive the equipment of HDMI information.Comprise core component HDMI relaying (repeater) module in the power amplifying device, HDMI repeater module can detect the EDID information of input end and output terminal.
Step S120 resolves this EDID information, judges whether receiving equipment is digital video interface device, if, execution in step S130, if not, execution in step S140.
Concrete, EDID information is resolved, draw the type of receiving equipment, judge whether receiving equipment is DVI (Digital Visual Interface, digital visual interface) equipment.
Step S130 revises first data block in this EDID information, and the newly-increased data block that is used to store the audio format information that power amplifying device supports.
Concrete, the EDID data are to be a block with 128 bytes.In 128 bytes, 0-7 byte is header; 8-9 byte is vendor id; 10-11 byte is product IDs, and 12-15 byte is the 32-bit sequence number; 16-17 byte is manufacturer's information; 18-19 byte is the EDID version; 20-24 the essential information (power supply, maximum height, width) that byte is a receiving equipment; 25-34 byte is the color characteristic of receiving equipment; 35-37 byte is the basic sequential of receiving equipment, regularly, and resolution; 38-53 standard time sequence and the timing that byte is a receiving equipment; 54-125 detailed sequential and the timing that byte is a receiving equipment; 126 bytes are the extension flag position, are set to 0; 127 bytes are the summation validation value.
If receiving equipment DVI kind equipment is because of the EDID information of DVI kind equipment comprises 2 block (data block), i.e. block0 and block1.In the present embodiment, be first data block with block1.
The step of revising first data block in the EDID information is specially: the extension flag position of first data block in the EDID information is rewritten as 1, and revises the summation validation value of first data block.Concrete, the extension flag position of first data block is 0, and it is revised as 1, and expression can be expanded, with the difference of the summation of the data of 0xff and 128 bytes summation validation value (checksum) as first data block.
After revising first data block in the EDID information; The newdata piece is used for only storing the audio format information that power amplifying device is supported, like MPEG (Moving Pictures Experts Group; The dynamic image group), WMA (Windows MediaAudio, multimedia) etc.
Step S140 resolves the audio format information that the receiving equipment of second data block in this EDID information is supported, and is the audio format information that power amplifying device is supported with the audio format information correction that the receiving equipment in second data block is supported.
Concrete; Receiving equipment is non-DVI kind equipment; Comprise first data block and second data block in the EDID information of non-DVI kind equipment, directly from second data block, find and characterize the audio format information that receiving equipment is supported, it is revised as the audio format information that power amplifying device is supported.In the present embodiment, second data block is the block2 among the EDID.
The structure of block2 is as shown in table 1 below.
Table 1
0 ~ 3 byte has special implication, resolves the type of its high 3 bit representation TAG, the length of the low current TAG of 5 bit representations since 4 bytes.After reading EDID information, in block2, find audio TAG, it is replaced with 0x23,0x0D, 0x7F, (value representation of these 4 bytes is supported 6ch Dolby digital48hz 24bit to 0x07.Revise the checksum value then.This checksum value is the difference of the summation of all data among 0xFF and the block2.
Step S150 gives input source equipment with amended this EDID information transmission.
Concrete, after power amplifying device is connected to input source equipment, give input source equipment with the EDID information transmission, input source equipment is decoded to audio frequency according to the audio format information of being supported in the EDID information, so that power amplifying device can output sound.
Fig. 2 is for realizing another embodiment of the method that high definition audio is imported.This method may further comprise the steps:
Step S210, whether the HPD pin that detects receiving equipment is effective, if, execution in step S220, if not, execution in step S230.
Concrete; HDMI repeater module in the power amplifying device detects HPD (hot plug detection) pin of receiving equipment; The effect that hot plug detects is when receiving equipment or input source equipment etc. are connected with power amplifying device or break off connection; HDMI repeater module can detect this incident, and makes response.When the HPD pin voltage of the connection receiving equipment that detects power amplifying device greater than first predeterminated voltage; The expression receiving equipment has inserted power amplifying device; The HPD pin of receiving equipment is effective; If HPD pin voltage, is then represented receiving equipment and power amplifying device less than second predeterminated voltage and breaks off that the HPD pin of receiving equipment is invalid.In the present embodiment, first predeterminated voltage can be 2V, and second predeterminated voltage is 0.8V.
Step S220 reads the EDID information of receiving equipment, then execution in step S240.
Step S230 reads the EDID information of the support audio format of acquiescence, then execution in step S270.
Concrete, it is invalid to detect HPD, when promptly not inserting receiving equipment, then uses the EDID information of the support audio format of acquiescence.
Step S240 resolves this EDID information, judges whether receiving equipment is digital video interface device, if, execution in step S250, if not, execution in step S260.
Step S250 revises first data block in this EDID information, and the newly-increased data block that is used to store the audio format information that power amplifying device supports.
Step S260 resolves the audio format information that the receiving equipment of second data block in this EDID information is supported, and is the audio format information that power amplifying device is supported with the audio format information correction that the receiving equipment in second data block is supported.
Step S270, whether the HPD pin that detects input source equipment is effective, if execution in step S280 if not, continues execution in step S270.
Concrete, the HPD pin of input source equipment is effective, promptly has input source equipment to insert, and then gives input source equipment with amended this EDID information transmission; The HPD pin of input source equipment is invalid, does not promptly have input source equipment to insert, and then continues to detect effective up to the HPD of input source equipment pin.
Step S280 gives input source equipment with amended this EDID information transmission.
As shown in Figure 3, in one embodiment, a kind of power amplifying device comprises HDMI (HDMI) trunk module 10, and HDMI trunk module 10 comprises reading unit 110, resolution unit 120, change unit 130 and transmission unit 140.Power amplifying device is the power amplifying device of 5.1 or 2.1 passages.Wherein:
Reading unit 110 is used to read the EDID information of receiving equipment.Concrete; EDID (Extended Display Identification Data; The extending display identification data) be a kind of VESA (Video Electronics Standards Association; Video electronics standard) standard data format; The parameter that wherein comprises relevant monitor and performance thereof, it comprises, and supplier information, maximum image size, color settings, manufacturer pre-set, the character string of the restriction of frequency range, the audio frequency and video format information of being supported, the code stream form of being supported, port number, maximum SF, loudspeaker layout and display name and sequence number etc.Above-mentioned information is kept in the display joint, is used for communicating through a DDC (Display Data Channel) and system, and this communication is carried out between display and PC EGA.EDID can use in displays such as CRT, LCD.In the present embodiment, receiving equipment can be TV or other receive the equipment of HDMI information.
Concrete, if receiving equipment DVI kind equipment, because of the EDID information of DVI kind equipment comprises 2 block (data block), i.e. block0 and block1.In the present embodiment, be first data block with block1.After revising first data block in the EDID information; Newdata piece (block2); Be used for only storing the audio format information that power amplifying device is supported, like MPEG (Moving Pictures Experts Group, dynamic image group), WMA (Windows Media Audio) etc.
Receiving equipment is non-DVI kind equipment; Comprise first data block and second data block in the EDID information of non-DVI kind equipment; Directly from second data block, find and characterize the audio format information that receiving equipment is supported, it is revised as the audio format information that power amplifying device is supported.In the present embodiment, second data block is the block2 among the EDID.
Further, change unit 130 also is used for the extension flag position of first data block of EDID information is rewritten as 1, and revises the summation validation value of first data block.Concrete, the extension flag position of first data block is 0, and it is revised as 1, and expression can be expanded, with the difference of the summation of the data of 0xff and 128 bytes summation validation value (checksum) as first data block.
As shown in Figure 4, in one embodiment, HDMI trunk module 10 also comprises detecting unit 150 except comprising reading unit 110, resolution unit 120, change unit 130 and transmission unit 140.Wherein:
Whether detecting unit 150 is used to detect the HPD pin of input source equipment effective.Concrete; The detecting unit 150 of the HDMI repeater module in the power amplifying device detects HPD (hot plug detection) pin of receiving equipment; The effect that hot plug detects is when receiving equipment or input source equipment etc. are connected with power amplifying device or break off connection; HDMI repeater module can detect this incident, and makes response.When the HPD pin voltage of the connection receiving equipment that detects power amplifying device greater than first predeterminated voltage; The expression receiving equipment has inserted power amplifying device; The HPD pin of receiving equipment is effective; If HPD pin voltage, is then represented receiving equipment and power amplifying device less than second predeterminated voltage and breaks off that the HPD pin of receiving equipment is invalid.In the present embodiment, first predeterminated voltage can be 2V, and second predeterminated voltage is 0.8V.
Whether detecting unit 150 also is used to detect the HPD pin of receiving equipment effective.
Reading unit 110 also is used for when the HPD pin that detects receiving equipment is effective, reading the EDID information of receiving equipment.
Reading unit 110 also is used for detecting the HPD pin of receiving equipment when invalid when detecting unit 150, reads the EDID information of the support audio format of acquiescence, and then whether detect the HPD pin of input source equipment by detecting unit 150 effective.
The method and the power amplifying device of above-mentioned realization high definition audio input; After reading the EDID information of receiving equipment; Data block in the EDID information of receiving equipment is rewritten; The audio format information correction that the receiving equipment of second data block is supported is the audio format information that power amplifying device is supported, or newly-increased data block of storing the audio format information of being supported, gives input source equipment with amended EDID information transmission then; Input source equipment is decoded to high-definition multimedia according to the audio format information in the amended EDID information and is obtained the audio frequency that power amplifying device is supported; The 7.1 passage power amplifying devices that do not need expensive support high definition audio adopt the power amplifying device of lower-cost 5.1 passage power amplifying devices or lower passage also can realize the input to high definition audio, have reduced cost.
In addition, whether through detecting the HPD pin of input source equipment, can obtain has input source equipment to be linked into power amplifying device, during convenient the access, the EDID information transmission is given the input source equipment that inserts.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. method that realizes high definition audio input may further comprise the steps:
Read the EDID information of receiving equipment;
Resolve said EDID information; Judge whether said receiving equipment is digital video interface device, if then revise first data block in the said EDID information; And the newly-increased data block that is used to store the audio format information that power amplifying device supports; If not, then resolve the audio format information that the receiving equipment of second data block in the said EDID information is supported, and be the audio format information that power amplifying device is supported the audio format information correction that the receiving equipment in said second data block is supported;
Give input source equipment with amended EDID information transmission.
2. the method for realization high definition audio input according to claim 1 is characterized in that the step of first data block in the said EDID information of said modification is specially:
The extension flag position of first data block in the said EDID information is rewritten as 1, and revises the summation validation value of first data block.
3. according to the method for the realization high definition audio described in claim 1 or 2 input, it is characterized in that, said will amended said EDID information transmission to before the step of input source equipment, also comprise step:
Whether the HPD pin that detects input source equipment is effective, if, then give said input source equipment with amended said EDID information transmission, if not, whether the HPD pin that then continues detection input source equipment is effective.
4. according to the method for the realization high definition audio described in the claim 3 input, it is characterized in that, before the step of the said EDID information that reads receiving equipment, also comprise step:
Whether the HPD pin that detects receiving equipment is effective, if then read the EDID information of receiving equipment.
5. the method for realization high definition audio input according to claim 4; It is characterized in that; Also comprise step: when the HPD pin that detects receiving equipment is invalid, read the EDID information of the support audio format of acquiescence, effectively whether the HPD pin that gets into said detection input source equipment then step.
6. a power amplifying device is characterized in that, comprises the HDMI trunk module, and said HDMI trunk module comprises:
Reading unit is used to read the EDID information of receiving equipment;
Resolution unit is used to resolve said EDID information, judges whether said receiving equipment is digital video interface device;
The change unit; Be used for when judging said receiving equipment and be digital video interface device; Revise first data block in the said EDID information; And the newly-increased data block that is used to store the audio format information that power amplifying device supports; And judging said receiving equipment for digital video interface device and after parsing the audio format information that the receiving equipment of second data block in the said EDID information supports, the audio format information correction that the receiving equipment in said second data block is supported is the audio format information that power amplifying device is supported;
Transmission unit is used for giving input source equipment with amended EDID information transmission.
7. power amplifying device according to claim 6 is characterized in that, said change unit also is used for the extension flag position of first data block of said EDID information is rewritten as 1, and revises the summation validation value of first data block.
8. according to the power amplifying device described in claim 6 or 7, it is characterized in that said HDMI trunk module also comprises:
Detecting unit, whether the HPD pin that is used to detect input source equipment is effective;
Said transmission unit also is used for when the HPD pin that detects input source equipment is effective, gives said input source equipment with amended said EDID information transmission.
9. the power amplifying device described in according to Claim 8 is characterized in that, whether said detecting unit also is used to detect the HPD pin of receiving equipment effective; Said reading unit also is used for when the HPD pin that detects receiving equipment is effective, reading the EDID information of said receiving equipment.
10. power amplifying device according to claim 9; It is characterized in that; Whether said reading unit also is used for when the HPD pin that detects receiving equipment is invalid, reading the EDID information of the support audio format of acquiescence, and then effective by the HPD pin of said detection input source equipment.
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