CN101155286A - I2S ringing wipe circuit - Google Patents
I2S ringing wipe circuit Download PDFInfo
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- CN101155286A CN101155286A CNA2007100768529A CN200710076852A CN101155286A CN 101155286 A CN101155286 A CN 101155286A CN A2007100768529 A CNA2007100768529 A CN A2007100768529A CN 200710076852 A CN200710076852 A CN 200710076852A CN 101155286 A CN101155286 A CN 101155286A
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- 238000006243 chemical reaction Methods 0.000 claims description 16
- 230000005236 sound signal Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000011514 reflex Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Abstract
The present invention discloses a I2S ringing eliminating circuit, which eliminates the ringing cacophony generated by the I2S circuit of TV as well as DVD, and improves sound output effect. To the I2S ringing eliminating circuit of the present invention, the audio data serial data pin of the I2S source connects to the audio data serial data pin of a digital-analog transformation integrated circuit by a first resistance, the I2S source and the audio serial data pin input end of the digital-analog transformation circuit connect to one end of the resistance with the mode of initiative connecting in parallel, the other end of the resistance connects to the power supply voltage of the circuit. Compared with the existing technology, the audio serial data pin input end of the digital-analog transformation circuit connects with the resistance with the mode of initiative connecting in parallel, and consumes the ringing harmful signal among the I2S data signal on the resistance with power consumption mode, so as to reach eliminate ringing, and to eliminate cacophony of the audio signal finally.
Description
Technical field
The present invention relates to a kind of television set, DVD and set-top box circuit, the audio data transmission bus circuit in particularly a kind of television set, DVD and the set-top box.
Background technology
In the audio data transmission bus circuit between television set, DVD and set-top box digital audio-frequency apparatus, the I2S line of prior art (I2S bus: Inter-IC Sound Bus), particularly the I2S source is arrived and is adopted the serial ending between the load analog to digital converter DAC on the data wire, as shown in Figure 1, serial connection one resistance is with the impedance of coupling I2S source end on the I2S line, reduce signal reflex, the selection of this series resistor is according to adding that for each the output output impedance of I2S source the series resistor resistance approximates transmission line impedance.In practical engineering application, be difficult to accomplish impedance matching accurately, signal reflex still exists, and may repeatedly be reflected, and forms ring.The voice data serial data input pin SDIN of I2S signal is as the data wire of digital audio and video signals, if ring is arranged on the data wire, the data that the SDIN input that makes digital-to-analogue conversion integrated circuit DAC is received are inaccurate and may cause that simulated audio signal after the digital-to-analogue DA conversion carries this ring secretly and disturb, disturbed simulated audio signal is through power amplification, can become noise, influence the voice output effect of television set, DVD.
Summary of the invention
The purpose of this invention is to provide a kind of I2S ring and eliminate circuit, the technical problem that solve is to eliminate the ring noise that produces in the I2S circuit of television set, DVD, improves its voice output effect.
The present invention is by the following technical solutions: circuit is eliminated in a kind of I2S ring, the voice data serial data pin SDIN in I2S source meets the voice data serial data pin SDIN of digital-to-analogue conversion integrated circuit DAC through first resistance, the audio frequency serial data pin SDIN input that described I2S source is connected with digital-to-analogue conversion integrated circuit DAC, mode with the active parallel termination connects an end that draws resistance R 5, the supply power voltage VCC of the other end connection circuit of pull-up resistor R5.
Supply power voltage VCC of the present invention is direct voltage source independently.
Direct voltage source of the present invention is 3.3-5V.
Pull-up resistor R5 of the present invention is 100-1000 ohm.
The MST6151DA chip is adopted in I2S of the present invention source, and load digital-to-analogue conversion integrated circuit DAC adopts cs4344 D/A conversion chip, and pull-up resistor R5 adopts 220 ohm, and the supply power voltage VCC of circuit is 5V.
The present invention compared with prior art, the audio frequency serial data pin input end that the I2S source is connected with the digital-to-analogue conversion integrated circuit, connect in the mode of active parallel termination and to draw resistance, the mode of ring unwanted signals on the I2S data-signal with power consumption consumed on pull-up resistor, reach the elimination ring, finally eliminate the noise of audio signal.
Description of drawings
Fig. 1 is the I2S circuit diagram of prior art.
Fig. 2 is that circuit diagram is eliminated in the I2S ring of the embodiment of the invention.
Fig. 3 is the waveform schematic diagram of the bell signal of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.As shown in Figure 2, circuit is eliminated in I2S ring of the present invention, input at the load digital-to-analogue conversion integrated circuit DAC in I2S source, insert the end of pull-up resistor R5 in the mode of active parallel termination, this pull-up resistor resistance is chosen generally mustn't be very big, according to the practical engineering application situation, generally chooses between 100 to 1000 ohm and get final product, the supply power voltage VCC end of the other end connection circuit of pull-up resistor R5, and VCC must choose the independently direct voltage source that has suction, irritates current capacity.This pull-up resistor R5 termination has used the relative AC signal of DC power supply to be equivalent to the principle on ground, and the ring on the I2S data wire just in time is the less AC signal of a kind of amplitude, eliminate the mode of the pull-up resistor R5 active parallel termination of circuit by I2S ring of the present invention, bell signal in the circuit, pull-up resistor R5 and VCC form an ac circuit, bell signal just can consume on pull-up resistor R5 in the mode of acting like this, its consumed power is P=U * U/R5, and U is the alternating voltage effective value of bell signal.Thereby avoid the ring on the voice data to disturb the input that inputs to digital-to-analogue conversion integrated circuit DAC from serial data input pin SDIN, improve the acoustics of television set, DVD and set-top box.
As most preferred embodiment, the MST6151DA of Mstar company is adopted in I2S of the present invention source, load digital-to-analogue conversion integrated circuit DAC adopts the cs4344 D/A conversion chip of Cirrus logic company, and pull-up resistor R5 adopts common 220 ohm of fixed carbon resisters, and the supply power voltage VCC of circuit is 5V.Be used for the liquid crystal TV set KDL32CP31Q of Konka digital audio-frequency data transfer bus circuit.
As shown in Figure 3, adopt the circuit of most preferred embodiment of the present invention, through testing with oscilloscope, mark " 2 " arrow indication waveform is the waveform that has obvious bell signal, adopt active parallel termination pull-up resistor of the present invention after, bell signal is eliminated, waveform can return to arrow 1 indication waveform, like this, the interference of I2S voice data input is obviously eliminated, and has avoided the noise after digital-to-analogue D/A conversion.Y direction unit is db among Fig. 3, and directions X unit is a microsecond.
Claims (5)
1. circuit is eliminated in an I2S ring, the voice data serial data pin (SDIN) in I2S source connects the voice data serial data pin (SDIN) of digital-to-analogue conversion integrated circuit (DAC) through first resistance, it is characterized in that: audio frequency serial data pin (SDIN) input that described I2S source is connected with digital-to-analogue conversion integrated circuit (DAC), mode with the active parallel termination connects an end that draws resistance (R5), the supply power voltage (VCC) of the other end connection circuit of pull-up resistor (R5).
2. circuit is eliminated in I2S ring according to claim 1, it is characterized in that: described supply power voltage (VCC) is direct voltage source independently.
3. circuit is eliminated in I2S ring according to claim 2, and it is characterized in that: described direct voltage source is 3.3-5V.
4. circuit is eliminated in I2S ring according to claim 3, and it is characterized in that: described pull-up resistor (R5) is 100-1000 ohm.
5. circuit is eliminated in I2S ring according to claim 4, it is characterized in that: the MST6151DA chip is adopted in described I2S source, load digital-to-analogue conversion integrated circuit (DAC) adopts the cs4344D/A conversion chip, and pull-up resistor (R5) adopts 220 ohm, and the supply power voltage of circuit (VCC) is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100768529A CN101155286A (en) | 2007-08-31 | 2007-08-31 | I2S ringing wipe circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100768529A CN101155286A (en) | 2007-08-31 | 2007-08-31 | I2S ringing wipe circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101155286A true CN101155286A (en) | 2008-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100768529A Pending CN101155286A (en) | 2007-08-31 | 2007-08-31 | I2S ringing wipe circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101155286A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754005B (en) * | 2008-12-15 | 2013-03-06 | 康佳集团股份有限公司 | Digital video signal conversion device and digital video signal transmission system |
| CN103312370A (en) * | 2012-03-09 | 2013-09-18 | 陕西夸克自控科技有限公司 | Inhibition device and inhibition method of ringing trailing signal of drug detector |
| CN103970693A (en) * | 2014-05-22 | 2014-08-06 | 三星半导体(中国)研究开发有限公司 | Integral integrated circuit sound circuit |
-
2007
- 2007-08-31 CN CNA2007100768529A patent/CN101155286A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754005B (en) * | 2008-12-15 | 2013-03-06 | 康佳集团股份有限公司 | Digital video signal conversion device and digital video signal transmission system |
| CN103312370A (en) * | 2012-03-09 | 2013-09-18 | 陕西夸克自控科技有限公司 | Inhibition device and inhibition method of ringing trailing signal of drug detector |
| CN103970693A (en) * | 2014-05-22 | 2014-08-06 | 三星半导体(中国)研究开发有限公司 | Integral integrated circuit sound circuit |
| CN103970693B (en) * | 2014-05-22 | 2017-02-22 | 三星半导体(中国)研究开发有限公司 | Integral integrated circuit sound circuit |
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Application publication date: 20080402 |