CN201204046Y - I<2>S audio interface circuit with high time accuracy - Google Patents
I<2>S audio interface circuit with high time accuracy Download PDFInfo
- Publication number
- CN201204046Y CN201204046Y CNU2008200064501U CN200820006450U CN201204046Y CN 201204046 Y CN201204046 Y CN 201204046Y CN U2008200064501 U CNU2008200064501 U CN U2008200064501U CN 200820006450 U CN200820006450 U CN 200820006450U CN 201204046 Y CN201204046 Y CN 201204046Y
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- circuit
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- converting
- audio interface
- converting circuit
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Abstract
The utility model discloses a I2S audio interface circuit of high time precision, having I2S interface bus input and I2S data format setting bus input connected with output of a decoding circuit, and output thereof connected with the input of a D/A converting circuit. The circuit receives serial binary data in accordance with I2S interface standard or extended I2S interface standard, converting received data into I2S format acceptable by an audio D/A converting circuit. The circuit can be integrated in to a D/A converting circuit, and can exist independently outside the D/A converting circuit. The circuit can make D/A converting circuit receive I2S data stream while eliminate noise generated because of mismatch of time sequence, so that high quality of music playing is ensured, circuit construction is simple, and implementation is convenient.
Description
Technical field
The utility model relates to a kind of digital circuit, especially refers to a kind ofly be used for that DAB plays, and can make the audio frequency D/A converting circuit obtain the I of the digital audio data stream of high time precision
2The S voicefrequency circuit.
Background technology
At present, known DAB playing circuit all is made up of digital audio decoding decoding circuit and audio frequency D/A converting circuit.The digital audio decoding decoding circuit will convert the linear PCM data to such as the digital audio-frequency data of MP3 format after, through I
2The S audio interface sends D/A converting circuit to, and the latter converts digital signal to simulating signal after device plays such as earphone or loudspeaker are come out.But a lot of digital audio decoding decoding circuits can not provide and meet D/A converting circuit I fully
2The binary data stream that the S interface sequence requires, the result can bring extra distortion and noise to D/A converting circuit output, has reduced the music quality.
The utility model content
For overcome existing DAB playing circuit because of decoding circuit and D/A converting circuit at I
2The deficiency that does not match and brought on the S interface sequence, the utility model provide a kind of I
2S audio interface circuit, this circuit not only can receive and meet I
2The serial binary data of S interface specification, and can produce the I that meets the requirement of D/A converting circuit sequential easily
2The S input.
The I of this circuit
2The input of S voice data bus, I
2The S data layout is provided with the bus input and is connected with the output of an audio decoding circuit, and the output of circuit is connected with the input of a D/A converting circuit.
The data fit I that this circuit receives and exports
2I after S interface specification and the expansion
2The S interface specification makes I
2The S audio interface circuit can receive and send that the left and right acoustic channels data length does not wait, length is not subjected to the odd and even number restriction, allow to insert the binary data stream of padding data.This circuit is by reconstruct I
2The S data stream will be from the I of audio decoding circuit
2The S input converts to and meets the I that the D/A converting circuit sequential requires fully
2S output.I
2The S audio interface circuit has I
2The S data layout is provided with bus, and the digital audio decoding decoding circuit of prime is told the correct format of data stream that interface circuit transmits by these buses.Audio decoding circuit requires to calculate rational I according to D/A converting circuit to the sequential of importing data in decoding audio data
2The S data layout is also notified I
2The S audio interface circuit makes it thoroughly eliminate not matching that data stream exists on sequential.
Every frame data length, left and right acoustic channels data length, left and right acoustic channels valid data length can be passed through I in the output serial binary data stream
2The S data layout is provided with bus setting, also can be at I
2Just be set in advance during the design of S audio interface circuit.I
2The left and right acoustic channels data length can be different in the S data layout, and left and right acoustic channels valid data length can be different, and the left and right acoustic channels data length also can be different with left and right acoustic channels valid data length, even the left and right acoustic channels data length can be a strange idol.
Foregoing circuit can be integrated in the D/A converting circuit, and the data serial input interface use as D/A converting circuit also can be independent of outside the D/A converting circuit, uses as the connecting circuit between decoding circuit and D/A converting circuit, at this moment I
2It is compatible that the output of S audio interface circuit and the input of D/A converting circuit keep.
The beneficial effects of the utility model are: D/A converting circuit can receive I
2In the time of the S data stream, eliminate the noise that does not match and brought because of sequential easily, guarantee the high-quality of music.I
2The S audio interface circuit is simple in structure, and it is convenient to realize.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model.SCK represents I among the figure
2The S bus clock, SD represents I
2The serial data that transmits on the S bus, WS is used to discern I
2What transmit on the S bus is L channel data or right data.
Fig. 2 is an independent utility synoptic diagram of the present utility model.The utility model is independent of outside the D/A converting circuit among the figure.1. digital audio decoding decoding circuit, 2. audio frequency D/A converting circuit, 3.I
2The S audio interface circuit, 4.I
2The S audio interface, 5.I
2The S data layout is provided with bus.
Fig. 3 is an Embedded Application synoptic diagram of the present utility model.The utility model is integrated in the D/A converting circuit among the figure.1. digital audio decoding decoding circuit, 2. audio frequency D/A converting circuit, 3.I
2The S audio interface circuit, 4.I
2The S audio interface, 5.I
2The S data layout is provided with bus.
Fig. 4 is the I of standard
2S audio interface sequential chart.SCK represents I among the figure
2The S bus clock, SD represents I
2The serial data that transmits on the S bus, WS is used to discern I
2What transmit on the S bus is L channel data or right data.MSB represents the binary data most significant digit among the figure, and LSB represents the binary data lowest order.
Fig. 5 is the I after the expansion
2S audio interface sequential chart.SCK represents I among the figure
2The S bus clock, SD represents I
2The serial data that transmits on the S bus, WS is used to discern I
2What transmit on the S bus is L channel data or right data.MSB represents the binary data most significant digit among the figure, and LSB represents the binary data lowest order, and NULL represents filler.
Embodiment
The I of a kind of high time precision of the utility model
2The application principle figure of S audio interface circuit is with reference to shown in Figure 1.The digital audio-frequency data of digital audio decoding decoding circuit output passes through I
2S voice data bus is delivered to I
2In the S audio interface circuit.Simultaneously, the digital audio decoding decoding circuit passes through I
2The S data layout is provided with bus and tells I with control command
2The S audio interface circuit is informed the audio data format of current input, and the audio frequency D/A converting circuit data layout that can receive.I
2The audio frequency D/A converting circuit is received in the output of S audio interface circuit.I
2The S audio interface circuit will be from the I of audio decoding circuit by the reconstructed number audio data stream
2The S input converts to and meets the I that the D/A converting circuit sequential requires fully
2S output.
Fig. 2 is an independent utility synoptic diagram of the present utility model, and the utility model is independent of outside the D/A converting circuit among the figure.
Fig. 3 is another kind of application the of the present utility model.In this used, the utility model was integrated in the D/A converting circuit.
In Fig. 5, by at I
2Insert filler (NULL) in the S binary serial data stream, can obtain the Frame of appropriate length, the timing skew between coupling digital audio decoding decoding circuit and D/A converting circuit.
Claims (4)
1. the I of a high time precision
2The S audio interface circuit is characterized in that: the I of circuit
2The input of S interface bus, I
2The S data layout is provided with the bus input and is connected with the output of a decoding circuit, and the output of circuit is connected with the input of a D/A converting circuit.
2. the I of a kind of high time precision according to claim 1
2The S audio interface circuit is characterized in that: the data fit I that receives and export
2I after S interface specification and the expansion
2The S interface specification; Every frame data length, left and right acoustic channels data length, left and right acoustic channels valid data length can be passed through I in the output serial binary data stream
2The S data layout is provided with bus setting, also can be at I
2Just be set in advance during the design of S audio interface circuit; I
2The left and right acoustic channels data length can be different in the S data layout, and left and right acoustic channels valid data length can be different, and the left and right acoustic channels data length also can be different with left and right acoustic channels valid data length, even the left and right acoustic channels data length can be a strange idol.
3. the I of a kind of high time precision according to claim 1 and 2
2The S audio interface circuit is characterized in that: circuit is integrated in the D/A converting circuit, as the data serial input interface use of D/A converting circuit.
4. the I of a kind of high time precision according to claim 1 and 2
2The S audio interface circuit is characterized in that: circuit is independent of outside the D/A converting circuit, uses as the connecting circuit between decoding circuit and D/A converting circuit, at this moment I
2It is compatible that the output of S audio interface circuit and the input of D/A converting circuit keep.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200064501U CN201204046Y (en) | 2008-03-06 | 2008-03-06 | I<2>S audio interface circuit with high time accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200064501U CN201204046Y (en) | 2008-03-06 | 2008-03-06 | I<2>S audio interface circuit with high time accuracy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201204046Y true CN201204046Y (en) | 2009-03-04 |
Family
ID=40426359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200064501U Expired - Lifetime CN201204046Y (en) | 2008-03-06 | 2008-03-06 | I<2>S audio interface circuit with high time accuracy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201204046Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105472509A (en) * | 2015-12-30 | 2016-04-06 | 深圳Tcl数字技术有限公司 | Audio signal sending and receiving method and device |
-
2008
- 2008-03-06 CN CNU2008200064501U patent/CN201204046Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105472509A (en) * | 2015-12-30 | 2016-04-06 | 深圳Tcl数字技术有限公司 | Audio signal sending and receiving method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WUXI HUARUN XIKE MICROELECTRONICS CO., LTD. Free format text: FORMER OWNER: WUXI YING THAI TECHNOLOGY CO., LTD. Effective date: 20090619 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090619 Address after: Room 301, information industry zone, New District, Jiangsu, Wuxi Province: 214000 Patentee after: Wuxi China Resources Semico Co., Ltd. Address before: Building 2, block C, 21 Changjiang Road, New District, Jiangsu, Wuxi, China: 214028 Patentee before: Wuxi Intech Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090304 |
|
| CX01 | Expiry of patent term |