CN101359970B - Automobile radio circuit having pilot signal suppression - Google Patents
Automobile radio circuit having pilot signal suppression Download PDFInfo
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- CN101359970B CN101359970B CN200810156114XA CN200810156114A CN101359970B CN 101359970 B CN101359970 B CN 101359970B CN 200810156114X A CN200810156114X A CN 200810156114XA CN 200810156114 A CN200810156114 A CN 200810156114A CN 101359970 B CN101359970 B CN 101359970B
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Abstract
Disclosed is an automobile receiver circuit with pilot signal suppression, which relates to an integrated circuit of a vehicle sound equipment, and mainly relates to an automobile radio circuit, and the circuit comprises: a voltage controlled oscillating module (1), a 19kHz and 38kHz square wave generating module (2), a pilot signal demodulation module (3), an inhibit signal generating module (4) and a differential amplification module (5); wherein, an output end of the voltage controlled oscillating module (1) is connected with an input end of the 19kHz and 38kHz square wave generating module (2), output ends of the 19kHz and 38kHz square wave generating module (2) and the pilot signal demodulation module (3) are respectively connected with an input end of the inhibit signal generating module (4), and an output end of the inhibit signal generating module (4) is connected with an input end of the differential amplification module (5); input ends of the voltage controlled oscillating module (1) and the differential amplification module (5) are also respectively connected with a composite signal; and the circuit has the advantages of high signal-to-noise ratio, good high frequency response and excellent listening effect.
Description
Technical field
The present invention is a kind of auto radio adhesive integrated circuit that pilot signal suppresses that has, and relates generally to the FM multiplex demodulation output of autoadio, belongs to integrated circuit (IC) design, manufacturing technology field.
Background technology
Do not have the automobile radio circuit that pilot signal suppresses in the market.
In present stage, the home and abroad automobile radio circuit does not all have the pilot signal inhibit feature, all be by exporting termination filter with the pilot signal filtering at it, improve the signal to noise ratio of output audio signal, but because the frequency of pilot signal is 19kHz, in the upper limit of audio frequency, add that the HFS to audio frequency has attenuation behind the filter, influence high-frequency effect.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of automobile radio circuit that pilot signal suppresses that has, pilot signal in the composite signal after the f-m stereo acoustical signal demodulation that receives is curbed, improve signal to noise ratio, and don't influence frequency response, guarantee good audibility.
Technical scheme: the present invention produces one and the corresponding direct current signal of pilot signal amplitude by pilot signal being carried out detection; Simultaneously by produce the sinusoidal signal of 912kHz as the voltage controlled oscillator of reference signal with the pilot signal in the composite signal, produce definite 19kHz of phase relation and the square-wave signal of 38kHz through frequency division again, this two paths of signals phase adduction smoothly produces the near sinusoidal signal that frequency is 19kHz through electric capacity; The gain of adder is controlled by aforementioned direct current signal, finally generate one with the sinusoidal signal (inhibition signal) of pilot signal with frequency, homophase, constant amplitude.Signal should be suppressed again and composite signal is delivered to differential amplifier simultaneously, because differential amplifier has very high common mode inhibition effect, so the output signal of differential amplifier is the composite signal that pilot signal is curbed.
This circuit comprises the VCO module, 19kHz, 38kHz square wave generation module, and pilot signal detection module suppresses the signal generation module, the difference amplification module; The input of the output termination 19kHz of VCO module, 38kHz square wave generation module wherein, the output of 19kHz, 38kHz square wave generation module, pilot signal detection module connects the input that suppresses the signal generation module respectively, and the output that suppresses the signal generation module connects the input of difference amplification module; The input of control oscillation module, difference amplification module also connects composite signal respectively.
Composite signal is input to the 87 resistance from input pin FH, penetrate the inverting amplifier amplification that amiable the 98 triode to the 103 triodes are formed through the 91 triode and the 92 triode, the pilot signal wave detector that outputs to the 52 to the 57 triode and the 4th electric capacity composition again carries out the pilot tone detection, and the direct current signal that detects outputs to the 39 triode.19kHz, 38kHz square-wave signal are input to the inhibition signal generation module of being made up of the 29 to the 46 triode and produce the inhibition signal from the input of the 48 to the 50 triode after the paraphase shaping.Suppress signal and behind the filter filtering that constitutes by the 19 to the 28 triode, be input to difference amplification module input the 16 triode that constitutes by the first to the 16 triode again through the 3rd capacitive transmission, composite signal is input to another input first triode simultaneously, after differential amplifier amplifies, since the common mode inhibition effect of differential amplifier, the composite signal of its output signal for pilot signal is curbed.
Beneficial effect: owing to by common mode inhibition the 19kHz pilot signal in the composite signal is curbed, output at last need not connect filter, has both guaranteed the signal to noise ratio of output signal, can not reduce high frequency response characteristic again, has improved audibility greatly.
Description of drawings
Fig. 1 is the principle block diagram that the present invention has the automobile radio circuit of pilot signal inhibition, comprising VCO module 1, and 19kHz, 38kHz square wave generation module 2, pilot signal detection module 3 suppresses signal generation module 4, difference amplification module 5.
Fig. 2 is linked in sequence and is formed by Fig. 2 a, Fig. 2 b, Fig. 2 c, Fig. 2 d for the electrical schematic diagram that the present invention has the automobile radio circuit of pilot signal inhibition.
Embodiment
This automobile radio circuit with pilot signal inhibition need not connect output filter and both can guarantee higher signal to noise ratio, can guarantee the high frequency response effect again.Wherein the output of VCO module connects the input of 19kHz, 38kHz square wave generation module, the output of 19kHz, 38kHz square wave generation module connects the input that suppresses the signal generation module, the output of pilot signal detection module connects the input that suppresses the signal generation module, and the output that suppresses the signal generation module connects the input of difference amplification module.
This circuit comprises VCO module 1,19kHz, 38kHz square wave generation module 2, and pilot signal detection module 3 suppresses signal generation module 4, difference amplification module 5; The input of the output termination 19kHz of VCO module 1,38kHz square wave generation module 2 wherein, the output of 19kHz, 38kHz square wave generation module 2, pilot signal detection module 3 connects the input that suppresses signal generation module 4 respectively, and the output that suppresses signal generation module 4 connects the input of difference amplification module 5; The input of control oscillation module 1, difference amplification module 5 also connects composite signal respectively.
Here provide the principle electrical circuit schematic diagram (Fig. 2) that pilot signal suppresses, wherein the β of NPN pipe is 100, and the β of PNP pipe is 50.Composite signal is imported from the FH pin, the FH pin connects the 87 resistance, the the 91 and the 92 triode is connected into multiple tube, constitute the two poles of the earth penetrate with, the emitter of the 92 triode connects the 90 resistance, the 90 to the 95 resistance and the 98 to the 102 triode are connected into inverting amplifier, and its gain is determined by the 90 and the 92 resistance.The emitter of the 102 triode connects the collector electrode of the 52 triode and the emitter of the 53 triode, the emitter of the 52 triode and the collector electrode of the 53 triode, connect the 52 resistance again, the 54,55 triodes, the 53 resistance and the 56,57 triodes, the 54 resistance connection are identical with it.Another termination the 4th electric capacity and the 33 resistance of the 52,53 resistance.The 19kHz signal connects the base stage of the 49,50 triodes, connects the base stage of the 36,37 triodes after the paraphase, the 35,38 transistor bases.The 38kHz signal connects the base stage of the 48 triode, connects the emitter of the 40,41 triodes after the paraphase.The 39,40 and the 41,42 triodes are connected into composite pipe structure, and the 35 to 42 triode is connected into the two differential configurations of class.The 29,30,32,34,31,44 triodes are connected into the constant-current source structure respectively.The collector electrode of the 29,31 triodes connects the 3rd electric capacity, another termination the 25 resistance of this electric capacity.The the 23 to 27 resistance and the 24 to 28 triode are connected into in-phase amplifier, and gain is by the 23 and the 25 decision.The emitter of the 24 triode connects the 20 resistance.The the 16 to 20 resistance and the 17 to 20 triode are connected into follower, the collector electrode of the 17 triode connects the 14 resistance, another termination the 16 transistor base of this resistance, the 15,16 triodes are connected into composite pipe structure, the emitter of the 15 triode connects the 6th resistance, the base stage of another termination the 11 triode of this resistance.The input of composite signal FH pin, FH connects first resistance, another termination first transistor base of first resistance, first and second triode is connected into multiple tube, the emitter of second triode connects the 3rd resistance, another termination the tenth transistor base of this resistance, the 7th to 11 triode and the 5th to seven resistance are connected into differential amplifier.The the 57 to 77 resistance and the 59 to 85 triode are connected into biasing circuit, biasing are provided for above-mentioned main circuit.
This circuit adopts the bipolar process with IIL of 1.2um.The emitter region is injected and is adopted purity nitrogen technology, the β good uniformity of triode.The ERROR CONTROL of resistance is in 10%.
Claims (1)
1. one kind has the automobile radio circuit that pilot signal suppresses, it is characterized in that this circuit comprises VCO module (1), 19kHz, 38kHz square wave generation module (2), pilot signal detection module (3), suppress signal generation module (4), difference amplification module (5); The input of the output termination 19kHz of VCO module (1), 38kHz square wave generation module (2) wherein, the output of 19kHz, 38kHz square wave generation module (2), pilot signal detection module (3) connects the input that suppresses signal generation module (4) respectively, and the output that suppresses signal generation module (4) connects the input of difference amplification module (5); The input of VCO module (1), difference amplification module (5) also connects composite signal respectively;
In pilot signal detection module (3), the emitter of the 102 triode (T102) connects the collector electrode of the 52 triode (T52) and the emitter of the 53 triode (T53), the emitter of the 52 triode (T52) connects the collector electrode of the 53 triode (T53), the collector electrode of the 53 triode (T53) connects the 52 resistance (R52), the emitter of the 92 triode (T92) connects the collector electrode of the 54 triode (T54) and the emitter of the 55 triode (T55), the emitter of the 54 triode (T54) connects the collector electrode of the 55 triode (T55), the collector electrode of the 55 triode (T55) connects the 53 resistance (R53), the emitter of the 95 triode (T95) connects the collector electrode of the 57 triode (T57) and the emitter of the 56 triode (T56), the emitter of the 57 triode (T57) connects the collector electrode of the 56 triode (T56), and the collector electrode of the 56 triode (T56) connects the 54 resistance (R54);
In suppressing signal generation module (4), the emitter of the 39 triode (T39) connects the base stage of the 40 triode (T40), the collector electrode of the 39 triode (T39) connects the collector electrode of the 40 triode (T40), the emitter of the 42 triode (T42) connects the base stage of the 41 triode (T41), the collector electrode of the 42 triode (T42) connects the collector electrode of the 41 triode (T41), the emitter of the 40 triode (T40) connects the emitter of the 41 triode (T41), the emitter of the 35 triode (T35) connects the collector electrode of the 40 triode (T40), the collector electrode of the 35 triode (T35) connects the collector electrode of the 36 triode (T36), the emitter of the 36 triode (T36) connects the collector electrode of the 41 triode (T41), the emitter of the 37 triode (T37) connects the collector electrode of the 40 triode (T40), the collector electrode of the 37 triode (T37) connects the collector electrode of the 38 triode (T38), the emitter of the 38 triode (T38) connects the collector electrode of the 41 triode (T41), the base stage of the 35 triode (T35) connects the base stage of the 38 triode (T38), the base stage of the 36 triode (T36) connects the base stage of the 37 triode (T37), and the emitter of the 40 triode (T40) connects the emitter of the 41 triode (T41);
In difference amplification module (5), suppress signal and connect the 3rd electric capacity (C3), the 3rd electric capacity (C3) the 25 resistance (R25), the emitter of the 27 triode (T27) connects the emitter of the 28 triode (T28), the base stage of the 24 triode (T24) connects the collector electrode of the 27 triode (T27), the emitter of the 19 triode (T19) connects the emitter of the 20 triode (T20), the emitter of the 16 triode (T16) connects the base stage of the 15 triode (T15), composite signal is imported from the FH pin, FH connects first resistance (R1), another termination first triode (T1) base stage of first resistance (R1), the emitter of first triode (T1) connects the base stage of second triode (T2), the emitter of second triode (T2) connects the 3rd resistance (R3), another termination the tenth triode (T10) base stage of the 3rd resistance (R3), the emitter of the tenth triode (T10) connects the 5th resistance (R5), the emitter of the 11 triode (T11) connects the 6th resistance (R6), the 5th resistance (R5) connects the 6th resistance (R6), and the base stage of the 9th triode (T9) connects the collector electrode of the tenth triode (T10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810156114XA CN101359970B (en) | 2008-09-28 | 2008-09-28 | Automobile radio circuit having pilot signal suppression |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810156114XA CN101359970B (en) | 2008-09-28 | 2008-09-28 | Automobile radio circuit having pilot signal suppression |
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| Publication Number | Publication Date |
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| CN101359970A CN101359970A (en) | 2009-02-04 |
| CN101359970B true CN101359970B (en) | 2011-07-27 |
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| CN200810156114XA Active CN101359970B (en) | 2008-09-28 | 2008-09-28 | Automobile radio circuit having pilot signal suppression |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108447241B (en) * | 2018-03-30 | 2020-05-08 | 王海霞 | Medical equipment signal transmission calibrating device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102323B (en) * | 1985-04-01 | 1987-02-04 | 株式会社日立制作所 | Fm demodulator |
| EP0374996A1 (en) * | 1988-12-01 | 1990-06-27 | Koninklijke Philips Electronics N.V. | FM-receiver |
| CN1614881A (en) * | 2003-11-07 | 2005-05-11 | 阿尔卑斯电气株式会社 | Audio signal amplifying circuit |
-
2008
- 2008-09-28 CN CN200810156114XA patent/CN101359970B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102323B (en) * | 1985-04-01 | 1987-02-04 | 株式会社日立制作所 | Fm demodulator |
| EP0374996A1 (en) * | 1988-12-01 | 1990-06-27 | Koninklijke Philips Electronics N.V. | FM-receiver |
| CN1614881A (en) * | 2003-11-07 | 2005-05-11 | 阿尔卑斯电气株式会社 | Audio signal amplifying circuit |
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| CN101359970A (en) | 2009-02-04 |
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Address after: No. 5, Xijin Road, Xinwu District, Wuxi City, Jiangsu Province, 214000 Patentee after: Wuxi Jingyuan Microelectronics Co.,Ltd. Address before: No. 5, Xijin Road, Plot 106-C, Wuxi National High tech Industrial Development Zone, Wuxi City, Jiangsu Province, 214028 Patentee before: Wuxi Jingyuan Microelectronics Co.,Ltd. |
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