CN213818156U - Integrated circuit with noise reduction function - Google Patents
Integrated circuit with noise reduction function Download PDFInfo
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- CN213818156U CN213818156U CN202023323079.1U CN202023323079U CN213818156U CN 213818156 U CN213818156 U CN 213818156U CN 202023323079 U CN202023323079 U CN 202023323079U CN 213818156 U CN213818156 U CN 213818156U
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- 239000003990 capacitor Substances 0.000 claims abstract description 76
- 230000005236 sound signal Effects 0.000 claims abstract description 30
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to an integrated circuit technical field discloses a lower and stable integrated circuit who has the function of making an uproar of falling of cost, possesses: the first capacitor is used for receiving a left channel audio signal; the second capacitor is used for receiving the right channel audio signal; the input end of the main controller is connected with one end of the first capacitor and used for receiving the left channel audio signal input by the first capacitor; the other input end of the main controller is connected with one end of a second capacitor and used for receiving a right channel audio signal input through the second capacitor; the main controller forms a bandwidth control signal according to the input audio signal, and the bandwidth control signal is used for preventing the stereo wandering.
Description
Technical Field
The utility model relates to an integrated circuit technical field, more specifically say, relate to an integrated circuit with function of making an uproar is fallen.
Background
Active noise reduction generates reverse sound waves equal to external noise through a DNR system, and the noise is neutralized, so that the noise reduction effect is realized. Currently, noise reduction integrated circuits are compatible with prerecorded magnetic tape and FM broadcasts. The psychoacoustic masking and adaptive bandwidth scheme allows the DNR to achieve 10 db noise reduction. However, the circuit layout of the conventional noise reduction integrated circuit is complex, and more electronic components are required, so that the manufacturing cost of the noise reduction integrated circuit is high, and the noise reduction effect is poor.
Therefore, how to simplify the cost of the noise reduction integrated circuit is a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, the circuit layout of the above-mentioned existing integrated circuit of making an uproar that falls to prior art is more complicated, and the electronic component that needs is more, and the cost of manufacture that leads to falling the integrated circuit of making an uproar is higher, and the relatively poor defect of noise reduction effect provides a lower and stable integrated circuit who has the function of making an uproar of falling with a cost.
The utility model provides a technical scheme that its technical problem adopted is: an integrated circuit having a noise reduction function is configured, and the integrated circuit is provided with:
a first capacitor configured in the integrated circuit for receiving a left channel audio signal;
a second capacitor configured in the integrated circuit for receiving the right channel audio signal;
the input end of the main controller is connected with one end of the first capacitor and used for receiving the left channel audio signal input by the first capacitor;
the other input end of the main controller is connected with one end of the second capacitor and used for receiving the right channel audio signal input through the second capacitor;
the main controller forms a bandwidth control signal according to the input audio signal, and the bandwidth control signal is used for preventing stereo wave.
In some embodiments, the capacitor further comprises a fourth capacitor and a fifth capacitor connected in series and a sixth capacitor and a seventh capacitor connected in series,
one end of the fourth capacitor is connected with the right sound channel signal output end of the master controller, and one end of the fifth capacitor is connected with the input end of an earphone or a power amplifier;
one end of the sixth capacitor is connected with the left sound channel signal output end of the master controller, and one end of the seventh capacitor is connected with the input end of an earphone or a power amplifier.
In some embodiments, the circuit further comprises an eighth capacitor, a first resistor and a second resistor,
wherein the first resistor is connected in series with the second resistor,
one end of the eighth capacitor is connected with the output end of the adder of the master controller, the other end of the eighth capacitor is connected with one end of the first resistor,
one end of the second resistor is connected with the common end.
In some embodiments, the circuit further comprises a third resistor and a first inductor connected in series,
one end of the third resistor is connected with the output end of the gain amplifier of the main controller, and one end of the first inductor is connected with the common end through a twelfth capacitor and a thirteenth capacitor.
In some embodiments, the first inductance is an adjustable inductance.
The integrated circuit with noise reduction function of the present invention comprises a first capacitor for receiving a left channel audio signal, a second capacitor for receiving a right channel audio signal, and a master controller, wherein the master controller is used for receiving the left channel audio signal and the right channel audio signal; the main controller forms a bandwidth control signal according to the input audio signal, and the bandwidth control signal is used for preventing the stereo wandering. Compared with the prior art, the main controller forms a bandwidth control signal capable of preventing the stereophonic sound flow according to the input audio signal, and effectively solves the problems that the existing noise-reducing integrated circuit is complex in circuit layout, needs more electronic elements, causes higher manufacturing cost of the noise-reducing integrated circuit and is poor in noise reduction effect.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic circuit diagram of an embodiment of an integrated circuit with noise reduction function provided by the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in the first embodiment of the integrated circuit with noise reduction function of the present invention, the integrated circuit 100 with noise reduction function includes a first capacitor C101, a second capacitor C102 and a master U101.
The first capacitor C101 is disposed in the integrated circuit, and is configured to receive a left channel audio signal and output the left channel audio signal to the main controller U101.
The second capacitor C102 is disposed in the integrated circuit and configured to receive the right channel audio signal and output the left channel audio signal to the master controller U101.
Master U101 has two signal paths, a main signal path and a bandwidth control path. The primary path is an audio low pass filter comprising a gm module with variable current and an operational amplifier configured as an integrator. The DC feedback limits the low frequency gain to AV-1. Above the cut-off frequency filter, the output is reduced by-6 dB/oct due to the 0.033 μ F capacitor.
The purpose of the control path is to generate a bandwidth control signal that replicates the noise emitted by the ear pair when emitting sound, and both channels use a control path through which the stereo wander is prevented.
Specifically, an input end (corresponding to pin 14) of the master controller U101 is connected to one end of the first capacitor C101, and is configured to receive the left channel audio signal input through the first capacitor C101.
The other input end (corresponding to pin 1) of the master controller U101 is connected to one end of the second capacitor C102, and is configured to receive the right channel audio signal input through the second capacitor C102.
The main controller U101 forms a bandwidth control signal for preventing the stereo wander according to the inputted audio signal.
By using the technical scheme, the main controller U101 forms a bandwidth control signal capable of preventing the stereophonic sound from flowing and waving according to the input audio signal, and the problems that the circuit layout of the existing noise-reducing integrated circuit is complex, more electronic elements are needed, the manufacturing cost of the noise-reducing integrated circuit is high, and the noise-reducing effect is poor can be effectively solved.
In some embodiments, in order to improve the effect of outputting the audio signal, a fourth capacitor C104, a fifth capacitor C105, a sixth capacitor C106, and a seventh capacitor C107 may be disposed in the integrated circuit.
The fourth capacitor C104 is connected in series with the fifth capacitor C105, and the sixth capacitor C106 is connected in series with the seventh capacitor C107.
One end of the fourth capacitor C104 is connected with the right channel signal output end (corresponding to 3 pins) of the master controller U101, and one end of the fifth capacitor C105 is connected with the input end of the earphone or the power amplifier.
One end of a sixth capacitor C106 is connected with the left channel signal output end (corresponding to 12 pins) of the master controller U101, and one end of a seventh capacitor C107 is connected with the input end of an earphone or a power amplifier.
In some embodiments, in order to open the bandwidth of the low pass filter, an eighth capacitor C108, a first resistor R101, and a second resistor R102 may be disposed in the integrated circuit, wherein the first resistor R101 and the second resistor R102 form a voltage divider for adjusting the input noise level to slightly open the bandwidth of the low pass filter.
Specifically, the first resistor R101 is connected in series with the second resistor R102.
One end of the eighth capacitor C108 is connected to the adder output end (corresponding to the 5-pin) of the master controller U101, the other end of the eighth capacitor C108 is connected to one end of the first resistor R101, and one end of the second resistor R102 is connected to the common end.
In some embodiments, the inductor further includes a third resistor R103 and a first inductor L101 connected in series, where the first inductor L101 is an adjustable inductor.
Specifically, one end of the third resistor R103 is connected to the output end (corresponding to 8 pins) of the gain amplifier of the master controller U101, and one end of the first inductor L101 is connected to the common terminal through the twelfth capacitor C112 and the thirteenth capacitor C113.
In particular, the DNR system should always be placed before the pitch and volume control because any adjustment to these controls will change the noise floor seen by the DNR control path.
The sensitivity resistors (corresponding to the first resistor R101 and the second resistor R102) may need to be switched by an input selector depending on the source, i.e. tape, FM or player.
For example, the values of the first resistor R101 and the second resistor R102 in a magnetic tape system are determined, tape noise (no program material) is applied and the ratio of the first resistor R101 and the second resistor R102 is adjusted to slightly open the bandwidth main signal path. In order to set the bandwidth sensitivity more flexibly, a potentiometer of 1k Ω may be used instead of the first resistor R101 and the second resistor R102, and when the minimum value and the maximum value of the bandwidth are to be changed, the integration capacitors (corresponding to the fourth capacitor C104 and the sixth capacitor C106) may be set to be enlarged or reduced. Since bandwidth is inversely proportional to capacitance, changing this 0.0039 μ F capacitance to add 0.0033 μ F changes the typical bandwidth from 965Hz-34kHz to 1.1kHz-40 kHz.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (5)
1. An integrated circuit having a noise reduction function, comprising:
a first capacitor configured in the integrated circuit for receiving a left channel audio signal;
a second capacitor configured in the integrated circuit for receiving the right channel audio signal;
the input end of the main controller is connected with one end of the first capacitor and used for receiving the left channel audio signal input by the first capacitor;
the other input end of the main controller is connected with one end of the second capacitor and used for receiving the right channel audio signal input through the second capacitor;
the main controller forms a bandwidth control signal according to the input audio signal, and the bandwidth control signal is used for preventing stereo wave.
2. The integrated circuit with noise reduction function according to claim 1,
also comprises a fourth capacitor and a fifth capacitor which are connected in series and a sixth capacitor and a seventh capacitor which are connected in series,
one end of the fourth capacitor is connected with the right sound channel signal output end of the master controller, and one end of the fifth capacitor is connected with the input end of an earphone or a power amplifier;
one end of the sixth capacitor is connected with the left sound channel signal output end of the master controller, and one end of the seventh capacitor is connected with the input end of an earphone or a power amplifier.
3. The integrated circuit with noise reduction function according to claim 1 or 2,
also comprises an eighth capacitor, a first resistor and a second resistor,
wherein the first resistor is connected in series with the second resistor,
one end of the eighth capacitor is connected with the output end of the adder of the master controller, the other end of the eighth capacitor is connected with one end of the first resistor,
one end of the second resistor is connected with the common end.
4. The integrated circuit with noise reduction function according to claim 1 or 2,
also comprises a third resistor and a first inductor which are connected in series,
one end of the third resistor is connected with the output end of the gain amplifier of the main controller, and one end of the first inductor is connected with the common end through a twelfth capacitor and a thirteenth capacitor.
5. The integrated circuit with noise reduction function according to claim 4, wherein the first inductor is an adjustable inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023323079.1U CN213818156U (en) | 2020-12-31 | 2020-12-31 | Integrated circuit with noise reduction function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023323079.1U CN213818156U (en) | 2020-12-31 | 2020-12-31 | Integrated circuit with noise reduction function |
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| CN213818156U true CN213818156U (en) | 2021-07-27 |
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| CN202023323079.1U Expired - Fee Related CN213818156U (en) | 2020-12-31 | 2020-12-31 | Integrated circuit with noise reduction function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230059333A1 (en) * | 2021-08-18 | 2023-02-23 | Cirrus Logic International Semiconductor Ltd. | Haptics signal generation |
-
2020
- 2020-12-31 CN CN202023323079.1U patent/CN213818156U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230059333A1 (en) * | 2021-08-18 | 2023-02-23 | Cirrus Logic International Semiconductor Ltd. | Haptics signal generation |
| US12106659B2 (en) * | 2021-08-18 | 2024-10-01 | Cirrus Logic Inc. | Haptics signal generation |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210727 |
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| CF01 | Termination of patent right due to non-payment of annual fee |