CN110677772A - Sound receiving device and method for generating noise signal thereof - Google Patents
Sound receiving device and method for generating noise signal thereof Download PDFInfo
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- CN110677772A CN110677772A CN201810718143.4A CN201810718143A CN110677772A CN 110677772 A CN110677772 A CN 110677772A CN 201810718143 A CN201810718143 A CN 201810718143A CN 110677772 A CN110677772 A CN 110677772A
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- current signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
Abstract
The invention provides a sound receiving device and a method for generating a noise signal thereof. The linear voltage-stabilizing module of the sound receiving device receives the power signal to convert into a first current signal. The microphone is used for receiving an external sound signal. The digital modulation module is used for receiving the first current signal and processing an external sound signal to form a digital sound signal. When the linear voltage stabilizing module receives the control signal, the first current signal is stopped to be provided, and the power supply signal transmits the current through the current limiting resistor to generate a second current signal to the digital modulation module, so that the digital modulation module generates and outputs a noise signal, wherein the ampere value of the second current signal is smaller than that of the first current signal and is not enough to normally drive the digital modulation module.
Description
Technical Field
The present invention relates to a sound receiving apparatus and a method for generating a noise signal thereof, and more particularly, to a sound receiving apparatus and a method for generating a noise signal thereof, which can generate a noise according to a difference between received current signals.
Background
With the advance of technology, various electronic devices with cameras or microphones have become common in modern life, whether smart phones, tablet computers, notebook computers, even desktop computers, and the like. But with the attendant requirement for privacy of the information. In terms of microphone privacy, it is possible to achieve this in hardware or software in the prior art. In terms of hardware, a switching element of the multiplexer and an additional sound source are required to replace the output signal of the microphone with another sound source. If controlled in a software manner, the system is easy to be invaded by hackers. In addition, if the volume of the input source of the microphone is directly adjusted to the minimum or silent state, the method easily causes the user to be confused about the current use state.
Therefore, it is necessary to invent a new sound receiving apparatus and a method for generating a noise signal thereof to solve the disadvantages of the prior art.
Disclosure of Invention
The main object of the present invention is to provide a sound receiving device, which has the effect of generating noise by the difference of the received current signals.
Another main object of the present invention is to provide another method for generating a noise signal for the above-mentioned sound receiving apparatus.
In order to achieve the above object, the sound receiving device of the present invention includes a power supply terminal, a linear voltage regulator module, a microphone, a digital modulation module, and a current limiting resistor. The power supply terminal is used for supplying a power signal. The linear voltage stabilizing module is electrically connected with the power supply end and used for receiving the power signal to convert the power signal into a first current signal. The microphone is used for receiving an external sound signal. The digital modulation module is electrically connected with the microphone and the linear voltage stabilization module and used for receiving the first current signal and processing an external sound signal to form a digital sound signal. The current limiting resistor is electrically connected with the power supply end and is connected with the linear voltage stabilizing module in parallel, when the linear voltage stabilizing module receives the control signal, the first current signal is stopped to be provided, and the power signal of the power supply end is transmitted to flow through the current limiting resistor to generate a second current signal to the digital modulation module, so that the digital modulation module generates and outputs a noise signal, wherein the ampere value of the second current signal is smaller than that of the first current signal and is not enough to normally drive the digital modulation module.
The method for generating the noise signal comprises the following steps: receiving an external sound signal by a microphone; receiving a power supply signal by a linear voltage stabilizing module to convert the power supply signal into a first current signal; the first current signal drives the digital modulation module to process the external sound signal to form a digital sound signal; and after the linear voltage stabilizing module receives the control signal, performing: stopping providing the first current signal; enabling the power supply signal to transmit through the current limiting resistor to generate a second current signal to the digital modulation module, wherein the ampere value of the second current signal is smaller than that of the first current signal and is not enough to normally drive the digital modulation module; and generating and outputting a noise signal.
Drawings
FIG. 1 is a schematic diagram of a sound receiving device according to the present invention.
Fig. 2 is a schematic diagram of waveforms related to digital sound signals and noise signals according to the present invention.
Fig. 3 is a flow chart of the steps of the method of noise signal generation of the present invention.
Description of the symbols:
1 Sound receiving device
10 linear voltage stabilizing module
20 microphone
30 digital modulation module
41 control signal input terminal
42 sound signal output terminal
C1, C2 capacitor
D digital sound signal
G ground terminal
N noise signal
R current limiting resistor
S1 Power supply Signal
S2 control signal
S3 first current signal
S4 second current signal
t1, t2 time
V0 power supply terminal
Detailed Description
In order to make the technical content of the present invention clearer, preferred embodiments are specifically illustrated as follows.
Referring to fig. 1, a schematic diagram of a sound receiving apparatus according to the present invention is shown.
In an embodiment of the present invention, the sound receiving apparatus 1 may be a device such as a smart phone, a tablet computer, a notebook computer, a desktop computer, or a part of the components of the device, but the present invention is not limited thereto. The sound receiving device 1 includes a power supply terminal V0, a linear regulator module 10, a microphone 20, a digital modulation module 30, and a current limiting resistor R. The sound receiving apparatus 1 may further include capacitors C1, C2 and a ground G, and the functions of the capacitors C1, C2 and the ground G are not important for the improvement of the present invention, and therefore, are not described herein again. It should be noted that the architecture shown in fig. 1 is only an illustration, and the invention is not limited to the sound receiving apparatus 1 having only the components shown in fig. 1.
The power supply terminal V0 is used to supply the power signal S1. The linear regulator module 10 is electrically connected to the power supply terminal V0 and is configured to receive the power signal S1 and convert the power signal into a first current signal S3, wherein the first current signal S3 is a current capable of normally driving the digital modulation module 30. The linear regulator module 10 is further connected to a control signal input terminal 41, and the control signal input terminal 41 is used for a user to determine whether to transmit the control signal S2 to the linear regulator module 10. The microphone 20 is used for receiving an external sound signal. The digital modulation module 30 is electrically connected to the microphone 20 and the linear regulator module 10 for receiving the first current signal S3. When the digital modulation module 30 receives the first current signal S3 with sufficient current, the external audio signal can be processed to become a digital audio signal D (as shown in fig. 2), and finally outputted from the audio signal output terminal 42.
The current limiting resistor R is electrically connected to the power supply terminal V0 and is connected in parallel with the linear regulator module 10. When the linear regulator module 10 receives the control signal S2 from the control signal input terminal 41, the linear regulator module 10 stops providing the first current signal S3. The power signal S1 of the power supply terminal V0 is transmitted through the current limiting resistor R to generate a second current signal S4. Therefore, the digital modulation module 30 only receives the second current signal S4, and the second current signal S4 has an amperage less than that of the first current signal S3, which is not enough to drive the digital modulation module 30 to normally operate, for example, when the digital modulation module 30 normally operates, the first current signal S3 may be 600uA of the working current for modulating the external audio signal, and the second signal current S4 may be 200uA of the working current for modulating the noise signal during abnormal operation, i.e., the amperage of the second current signal S4 is less than or equal to about one third of the amperage of the first current signal S3, but the invention is not limited thereto. Therefore, the digital modulation module 30 cannot obtain enough driving current, so that the processed external audio signal becomes a noise signal N (as shown in fig. 2) and is output to the audio signal output terminal 42. When the linear regulator module 10 receives another control signal S2 again, the first current signal S3 is restored to be provided to the digital modulation module 30, so that the digital modulation module 30 can regenerate the normal digital audio signal D.
As shown in fig. 2. Fig. 2 is a schematic diagram of waveforms related to digital sound signals and noise signals according to the present invention. When the digital modulation module 30 receives the first current signal S3 with sufficient amperage, the digital modulation module 30 can normally output the digital sound signal D. At time t1, the linear regulator module 10 receives the control signal S2, and therefore stops outputting the first current signal S3. At this time, when the digital modulation module 30 can only receive the second current signal S4 with a less than sufficient ampere value, the digital modulation module 30 will output the noise signal N. At time t2, the linear regulator module 10 receives the new control signal S2 again and resumes outputting the first current signal S3. At this time, the digital modulation module 30 is normally driven by receiving the first current signal S3 with sufficient amperage to output the digital sound signal D. It should be noted that the noise signal N can no longer be restored back to the original digital sound signal D.
It should be noted that, the modules of the sound receiving apparatus 1 may be configured by a hardware device, a software program combined with a hardware device, a firmware combined with a hardware device, and the like, but the present invention is not limited to the above-mentioned manner. In addition, the present embodiment only illustrates the preferred embodiments of the present invention, and all possible combinations and modifications are not described in detail to avoid redundancy. However, it should be understood by those skilled in the art that the above modules or components are not necessarily all necessary. And that other, more detailed, existing modules or components may be included to practice the invention. Each module or component may be omitted or modified as desired, and no other module or component may necessarily exist between any two modules.
Referring to fig. 3, a flowchart of the method for generating the noise signal according to the present invention is shown. It should be noted that, although the method for generating the noise signal according to the present invention is described below by taking the above-mentioned audio receiving apparatus 1 as an example, the method for generating the noise signal according to the present invention is not limited to the use of the audio receiving apparatus 1 having the same configuration as described above.
First, step 301 is performed: an external sound signal is received.
The microphone 20 may receive an external sound signal.
Then, step 302 is performed: and judging whether the control signal is received or not.
The linear regulator module 10 determines whether the control signal S2 is received from the control signal input terminal 41.
If the linear regulator module 10 does not receive the control signal S2, the method proceeds to step 303: the power supply signal is received to be converted into a first current signal.
At this time, the linear regulator module 10 receives the power signal S1 from the power supply terminal V0 to convert the power signal into the first current signal S3.
Then, step 304 is performed: the external sound signal is processed by the driving of the first current signal to become a digital sound signal.
Then, the digital modulation module 30 receives the first current signal S3 with sufficient current, and then processes the external audio signal to form the digital audio signal D.
If the linear regulator module 10 receives the control signal S2, the process proceeds to step 305: the supply of the first current signal is stopped.
At this time, after the linear regulator module 10 receives the control signal S2 from the control signal input terminal 41, the linear regulator module 10 stops providing the first current signal S3.
Then, step 306 is performed: the power signal is transmitted through the current limiting resistor to generate a second current signal to the digital modulation module.
The power signal S1 of the power supply terminal V0 is transmitted only through the current limiting resistor R to generate the second current signal S4, wherein the amperage of the second current signal S4 is less than the amperage of the first current signal S3. Thus, the digital modulation module 30 only receives the second current signal S4.
Then, step 307 is performed: generating and outputting a noise signal.
Since the digital modulation module 30 cannot obtain enough driving current, it can only convert the external sound signal into the noise signal N.
Finally, step 308 is performed: after receiving a new control signal, the first current signal is restored.
Finally, when the linear regulator module 10 receives the new control signal S2 again, the first current signal S3 is output again. The digital modulation module 30 normally outputs the digital sound signal D by receiving the first current signal S3 with sufficient amperage.
It should be noted that the method for generating the noise signal according to the present invention is not limited to the above-mentioned sequence of steps, and the sequence of the steps can be changed as long as the object of the present invention is achieved.
Therefore, the sound receiving apparatus 1 of the present invention can easily generate the noise signal N without installing an additional hardware switch. And the noise signal N can not be restored into the digital sound signal D any more, thus meeting the requirement of protecting the information privacy.
It should be noted that the above embodiments only illustrate the preferred embodiments of the present invention, and all possible combinations of the variations are not described in detail for avoiding redundancy. However, it should be understood by those skilled in the art that the above modules or components are not necessarily all necessary. And that other, more detailed, existing modules or components may be included to practice the invention. Each module or component may be omitted or modified as desired, and no other module or component may necessarily exist between any two modules. The scope of the claims should be determined only by the appended claims, and not by the broadest interpretation of the following claims.
Claims (6)
1. A sound receiving apparatus, comprising:
a power supply terminal for supplying a power signal;
the linear voltage stabilizing module is electrically connected with the power supply end and used for receiving the power signal to convert the power signal into a first current signal;
a microphone for receiving an external sound signal;
the digital modulation module is electrically connected with the microphone and the linear voltage stabilizing module and used for receiving the first current signal so as to process the external sound signal into a digital sound signal; and
and the current limiting resistor is electrically connected with the power supply end and is connected with the linear voltage stabilizing module in parallel, when the linear voltage stabilizing module receives a control signal, the first current signal is stopped to be provided, and the power signal of the power supply end is transmitted and flows through the current limiting resistor to generate a second current signal to the digital modulation module, so that the digital modulation module generates and outputs a noise signal, wherein the ampere value of the second current signal is less than that of the first current signal and is not enough to normally drive the digital modulation module.
2. The apparatus according to claim 1, wherein the linear regulator module resumes providing the first current signal to the digital modulation module after receiving a new control signal.
3. The sound receiving device of claim 1, wherein the second current signal has an amperage that is less than or equal to one-third of the amperage of the first current signal.
4. A method of generating a noise signal for use in a sound receiving apparatus, the method comprising:
receiving an external sound signal by a microphone;
receiving a power supply signal by a linear voltage stabilizing module to convert the power supply signal into a first current signal;
the first current signal drives a digital modulation module to process the external sound signal to form a digital sound signal; and
after the linear voltage stabilizing module receives the control signal, the following steps are carried out:
stopping providing the first current signal;
enabling the power signal to transmit through a current-limiting resistor to generate a second current signal to the digital modulation module, wherein the amperage of the second current signal is less than that of the first current signal and is insufficient to normally drive the digital modulation module; and
generating and outputting a noise signal.
5. A method of noise signal generation according to claim 4, further comprising the steps of:
after the linear voltage stabilizing module receives a new control signal, the first current signal is restored and provided to the digital modulation module.
6. A method according to claim 4, wherein the second current signal has an amperage which is less than or equal to one third of the amperage of the first current signal.
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| CN201810718143.4A CN110677772B (en) | 2018-07-03 | 2018-07-03 | Sound receiving device and method for generating noise signal thereof |
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| CN201810718143.4A CN110677772B (en) | 2018-07-03 | 2018-07-03 | Sound receiving device and method for generating noise signal thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113383718A (en) * | 2020-03-13 | 2021-09-14 | 群光电子股份有限公司 | Feeding device, noise reduction module thereof and noise reduction method |
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