CN111083406A - Audio processing method and camera - Google Patents
Audio processing method and camera Download PDFInfo
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- CN111083406A CN111083406A CN201811217746.2A CN201811217746A CN111083406A CN 111083406 A CN111083406 A CN 111083406A CN 201811217746 A CN201811217746 A CN 201811217746A CN 111083406 A CN111083406 A CN 111083406A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/16—Storage of analogue signals in digital stores using an arrangement comprising analogue/digital [A/D] converters, digital memories and digital/analogue [D/A] converters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
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Abstract
The embodiment of the invention provides an audio processing method and a camera, which are applied to the camera, wherein the method comprises the following steps: acquiring a current audio amplitude and a current audio gear according to the acquired current audio signal; and judging whether the current audio amplitude is within a set audio amplitude range, and if the current audio amplitude exceeds the audio amplitude range, adjusting the current audio gear. Thereby realizing the reliable record of the audio information of the monitored area.
Description
Technical Field
The invention relates to the technical field of cameras, in particular to an audio processing method and a camera.
Background
In a security system, the acquisition and generation of images are mainly realized by a camera, and in order to monitor a monitored area more comprehensively, the camera needs to acquire video images and audio information. However, the camera still has to be improved in terms of sound collection reliability.
Disclosure of Invention
In view of the above, the present invention provides an audio processing method and a video camera.
In a first aspect, an embodiment of the present invention provides an audio processing method, which is applied to a video camera, and the method includes:
acquiring a current audio amplitude and a current audio gear according to the acquired current audio signal;
and judging whether the current audio amplitude is within a set audio amplitude range, and if the current audio amplitude exceeds the audio amplitude range, adjusting the current audio gear.
The current audio amplitude is the amplitude of the collected current audio signal, and the current audio gear is the audio gear corresponding to the current audio amplitude.
Optionally, the camera stores a recent maximum audio amplitude and a historical maximum audio amplitude, and after acquiring a current audio signal acquired by the camera and acquiring a current audio amplitude and a current audio gear according to the current audio signal, the method further includes:
comparing the current audio amplitude to the recent maximum audio amplitude and a historical maximum audio amplitude.
If the current audio amplitude is larger than the recent maximum audio amplitude and not larger than the historical maximum audio amplitude, updating the recent maximum audio amplitude to be the current audio amplitude, and recording a new recent maximum audio amplitude.
If the current audio amplitude is larger than the recent maximum audio amplitude and the historical maximum audio amplitude, updating the recent maximum audio amplitude and the historical maximum audio amplitude to be the current audio amplitude, and recording a new recent maximum audio amplitude and a new historical maximum audio amplitude.
Preferably, after determining whether the current audio amplitude is within a set audio amplitude range, the method further includes:
and if the current audio amplitude is within a set audio amplitude range, the current audio gear is shifted up by one gear. Thereby making the current audio information clearer.
Optionally, if the current audio amplitude exceeds the audio amplitude range, the step of adjusting the current audio gear includes:
and if the current audio amplitude is equal to the upper limit of the audio amplitude range, the current audio gear is shifted down by one, so that information distortion caused by overlarge amplitude of the current audio information is avoided.
Optionally, if the current audio amplitude exceeds the audio amplitude range, the step of adjusting the current audio gear includes:
and if the current audio amplitude is larger than the upper limit of the set audio amplitude range, adjusting the current audio gear downwards.
Optionally, the camera stores a recent maximum audio gear and a historical maximum audio gear, and the step of turning down the current audio gear includes:
and if the current audio gear is not smaller than the recent maximum audio gear and not smaller than the historical maximum audio gear, adjusting the current audio gear to the historical maximum audio gear, so that information distortion caused by overlarge amplitude of the current audio information is avoided.
If the current audio gear is smaller than the recent maximum audio gear and/or the historical maximum audio gear, updating the historical maximum audio gear to the current audio gear, and adjusting the current audio gear by one gear, so that the current audio information is clearer.
Optionally, if the current audio amplitude exceeds the audio amplitude range, the step of adjusting the current audio gear includes:
and if the current audio amplitude is smaller than the lower limit of the audio amplitude range, the current audio gear is shifted up by N, and N is larger than or equal to 1.
And the camera compares the current audio gear with the historical maximum audio gear and the adjustable audio gear to obtain a comparison result, and determines the value of N according to the comparison result. For example, when the current gear is 1, the historical maximum audio gear is 10, and the adjustable audio gear is 10, the value of N is 9.
On the other hand, an embodiment of the present invention further provides a camera, where the above-mentioned audio processing method is applied to the camera, and the camera includes: the device comprises an audio input circuit, an adjustable voltage division circuit and a digital signal processor.
Further, the audio input circuit is electrically connected to the adjustable voltage dividing circuit, and is configured to acquire a current audio amplitude and a current audio gear obtained by the adjustable voltage dividing circuit, determine whether the current audio amplitude is within a set audio amplitude range, generate a corresponding control signal, and send the control signal to the adjustable voltage dividing circuit.
Furthermore, the adjustable voltage division circuit is used for adjusting the audio frequency gear and the current audio frequency amplitude according to the control signal.
Optionally, the adjustable voltage dividing circuit is a single digital potentiometer or a plurality of digital potentiometers combined in series.
The single digital potentiometer and the plurality of digital potentiometers which are combined in series are used for carrying out voltage division processing on the current audio signal.
Optionally, the camera further comprises an image capture device and a data storage.
Furthermore, the camera device is in communication connection with the data storage device and is used for collecting image information and sending the image information to the data storage device. The data memory is in communication connection with the adjustable voltage division circuit and is used for receiving the processed audio signal sent by the adjustable voltage division circuit. The data memory can send the processed audio signal to the audio playing device connected with the camera, so that the external audio device does not need to process the received audio information.
According to the audio processing method and the camera provided by the embodiment of the invention, the collected audio signals are processed to adjust the audio gear of the audio information exceeding the audio amplitude range, so that the collected current audio information can be reasonably and effectively adjusted, the audio information is high-definition information, the quality of the audio information collected by the camera is improved, and the reliable recording of the audio information of the monitored area is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of an audio processing method according to an embodiment of the present invention;
FIG. 2 is a flow chart of another audio processing method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating another audio processing method according to an embodiment of the invention;
fig. 4 is a block diagram schematically illustrating a structure of a camera according to an embodiment of the present invention.
Icon: 100-a camera; 10-an audio input circuit; 20-an adjustable voltage divider circuit; 30-a digital signal processor; 40-a camera device; 50-data storage.
Detailed Description
The invention relates to the technical field of cameras, in particular to an audio processing method and a camera.
In a security system, in order to comprehensively and effectively monitor a monitored site, it is necessary to record not only video information of the monitored area but also audio information of the monitored site. At present, the video cameras are developing towards digitization and unsupervised, but the current video cameras have defects in recording audio information of monitored sites.
During research, the inventor finds that a camera is often used in an external sound pickup device to collect sound on site, and processing of an audio signal is usually performed by an external device. Because the hardware circuit of the camera adopts different audio coding and decoding schemes, and the camera has different requirements on the input amplitude of the analog audio signal, the camera cannot acquire the effective audio signal.
In addition, the sound pick-up devices sold in the market are also different, and the amplitude of the output analog audio is also different, which further increases the difficulty of audio acquisition and processing.
The above prior art solutions have shortcomings which are the results of practical and careful study of the inventor, and therefore, the discovery process of the above problems and the solutions proposed by the following embodiments of the present invention to the above problems should be the contribution of the inventor to the present invention in the course of the present invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Please refer to fig. 1, which is a flowchart illustrating an audio processing method according to an embodiment of the present invention. It should be noted that the living body judgment method provided by the embodiment of the present invention is not limited by the specific sequence shown in fig. 1 and described below.
The method is applied to a camera 100, and comprises the following steps:
and acquiring a current audio amplitude and a current audio gear according to the acquired current audio signal.
And judging whether the current audio amplitude is within a set audio amplitude range, and if the current audio amplitude exceeds the audio amplitude range, adjusting the current audio gear.
The specific process is as follows:
in step S10, a current audio signal is acquired.
As an embodiment, the step S10 can be implemented as follows:
and acquiring a current audio signal, and acquiring a current audio amplitude and a current audio gear according to the acquired current audio signal.
The current audio amplitude is the amplitude of the collected current audio signal, and the current audio gear is the audio gear corresponding to the current audio amplitude.
Please refer to fig. 2, which is a block diagram illustrating another audio processing method according to an embodiment of the present invention. In this embodiment, the camera 100 stores a recent maximum audio amplitude and a historical maximum audio amplitude, and after step S10, the method further includes:
and step S11, judging whether the current audio amplitude is larger than the recent maximum audio amplitude, if so, executing step S12, and if not, executing step S20.
In step S12, the recent maximum audio amplitude is updated.
As an embodiment, the step S12 can be implemented as follows:
updating the recent maximum audio amplitude to the current audio amplitude.
Step S13, determining whether the current audio amplitude is greater than the historical maximum audio amplitude, if so, executing step S14, and if not, executing step S20.
In step S14, the historical maximum amplitude is updated.
As an embodiment, the step S14 can be implemented as follows:
updating the historical maximum audio amplitude to the current audio amplitude.
Step S20, determining whether the current audio amplitude is within an audio amplitude range, if the current audio amplitude is within the audio amplitude range, executing step S21, and if the current audio amplitude exceeds the audio amplitude range, executing step S22.
In step S21, the current audio gear is shifted up by one.
Step S22, determining whether the current audio amplitude is equal to the upper limit of the audio amplitude range, if the current audio amplitude is equal to the upper limit of the audio amplitude range, executing step S23, and if the current audio amplitude is not equal to the upper limit of the audio amplitude range, executing step S24.
In step S23, the current gear is shifted down by one.
Step S24, determining whether the current audio amplitude is greater than the upper limit of the audio amplitude range, if so, executing step S25, and if not, executing step S26.
In step S25, the current audio gear is adjusted downward.
Referring to fig. 3, the process of the current audio gear down-shift includes the following steps. The specific steps of the process corresponding to fig. 3 are described below.
And step S251, judging whether the current audio gear is not less than the recent maximum audio gear, if so, executing step S252, and if not, executing step S254.
And step S252, judging whether the current audio gear is not less than the historical maximum audio gear, if so, executing step S253, and if not, executing step S254.
In step S253, the current audio gear is adjusted to the historical maximum audio gear.
In step S254, the historical maximum audio gear is updated to the current audio gear.
In step S255, the current audio gear is shifted down by one.
In step S26, the current audio gear is shifted up to N.
And N is greater than or equal to 1, the camera 100 compares the current audio gear with the historical maximum audio gear and the adjustable audio gear to obtain a comparison result, and determines the value of N according to the comparison result. For example, when the current gear is 1, the historical maximum audio gear is 10, and the adjustable audio gear is 10, the value of N is 9.
Referring to fig. 4, a block diagram of a video camera 100 according to an embodiment of the invention is shown. The above-described audio processing method is applied to the video camera 100. In the present embodiment, the video camera 100 includes: audio input circuit 10, adjustable voltage divider circuit 20 and digital signal processor 30. The audio input circuit 10 is electrically connected to the adjustable voltage dividing circuit 20, and the adjustable voltage dividing circuit 20 is communicatively connected to the digital signal processor 30.
Further, the audio input circuit 10 is configured to collect a current audio signal, obtain a current audio amplitude and a current audio gear, and send the current audio amplitude and the current audio gear to the adjustable voltage dividing circuit 20.
Further, the digital signal processor 30 is configured to obtain a current audio amplitude and a current audio gear obtained by the adjustable voltage dividing circuit 20, determine whether the current audio amplitude is within a set audio amplitude range, generate a corresponding control signal, and send the control signal to the adjustable voltage dividing circuit 20.
Further, the adjustable voltage dividing circuit 20 is configured to adjust the audio gear and the current audio amplitude according to the control signal.
Optionally, if the digital signal processor 30 analyzes that the current audio amplitude of the current audio signal is greater than the upper limit of the preset audio amplitude range, a control signal for gear down-regulation corresponding to the current audio signal is generated and sent to the adjustable voltage dividing circuit 20, so that the adjustable voltage dividing circuit 20 performs gear down-regulation on the current audio signal greater than the upper limit of the preset audio amplitude range, thereby obtaining a clear audio signal.
If the digital signal processor 30 analyzes that the current audio amplitude of the current audio signal is equal to the upper limit of the preset audio amplitude range, a control signal for adjusting the gear down corresponding to the current audio signal is generated and sent to the adjustable voltage dividing circuit 20, so that the adjustable voltage dividing circuit 20 adjusts the gear down for the current audio signal equal to the upper limit of the preset audio amplitude range, thereby obtaining an audio signal with better sound quality.
If the digital signal processor 30 analyzes that the current audio amplitude of the current audio signal is smaller than or equal to the lower limit of the preset audio amplitude range, a control signal of shifting up the N gear corresponding to the current audio signal is generated and sent to the adjustable voltage division circuit 20, so that the adjustable voltage division circuit 20 shifts up the current audio signal smaller than or equal to the lower limit of the preset audio amplitude range, and amplifies the audio signal to obtain a clear audio signal.
If the digital signal processor 30 analyzes that the current audio amplitude of the current audio signal is within the preset audio amplitude range, a control signal corresponding to the current audio signal and used for shifting up the gear is generated and sent to the adjustable voltage division circuit 20, so that the adjustable voltage division circuit 20 shifts up the gear of the current audio signal within the preset audio amplitude range, and amplifies the audio signal to obtain a clearer audio signal.
Alternatively, the adjustable voltage divider circuit 20 may be a single digital potentiometer or a plurality of digital potentiometers combined in series.
The single digital potentiometer and the plurality of digital potentiometers which are combined in series are used for carrying out voltage division processing on the current audio signal.
Further, the adjustable voltage dividing circuit 20 performs corresponding processing of up-shifting or down-shifting the gear on the audio signal according to the received control signal, so as to obtain an adjusted audio signal.
Optionally, the camera 100 further comprises an image capture device 40 and a data storage 50.
Further, the camera device 40 is in communication connection with the data storage 50, and is configured to collect image information and send the image information to the data storage 50 for storage.
Further, the data storage 50 is communicatively connected to the adjustable voltage dividing circuit 20, and is configured to receive the processed audio signal sent by the adjustable voltage dividing circuit 20, so that the data storage 50 can send the processed audio signal to an audio playing device connected to the video camera 100, and thus the external audio device does not need to process the received audio information.
In summary, according to the audio processing method and the camera 100 provided by the embodiment of the present invention, the collected audio signal is processed, so as to adjust the audio gear of the audio information exceeding the audio amplitude range, and reasonably and effectively adjust the collected current audio information, so that the audio information is high-definition information, and the quality of the audio information collected by the camera 100 is further improved. Thus, the present invention can simply and efficiently perform audio processing, obtain high fidelity audio signals, and complete the processing of the audio signals before the audio signals are transmitted from the video camera 100 to the non-playback device, thereby reducing the noise generated by the audio signal processing on the image pickup device 40.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus and method embodiments described above are illustrative only, as the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. An audio processing method, applied to a camera, the method comprising:
acquiring a current audio amplitude and a current audio gear according to the acquired current audio signal;
and judging whether the current audio amplitude is within a set audio amplitude range, and if the current audio amplitude exceeds the audio amplitude range, adjusting the current audio gear.
2. The audio processing method of claim 1, wherein after determining whether the current audio amplitude is within a set audio amplitude range, the method further comprises:
and if the current audio amplitude is within a set audio amplitude range, the current audio gear is shifted up by one gear.
3. The audio processing method of claim 1, wherein the step of adjusting the current audio gear if the current audio amplitude exceeds the audio amplitude range comprises:
and if the current audio amplitude is equal to the upper limit of the audio amplitude range, the current audio gear is shifted down by one gear.
4. The audio processing method of claim 1, wherein the step of adjusting the current audio gear if the current audio amplitude exceeds the audio amplitude range comprises:
and if the current audio amplitude is larger than the upper limit of the set audio amplitude range, adjusting the current audio gear downwards.
5. The audio processing method according to claim 4, wherein the camera stores a recent maximum audio gear and a historical maximum audio gear, and the step of adjusting down the current audio gear comprises:
if the current audio gear is not less than the recent maximum audio gear and not less than the historical maximum audio gear, adjusting the current audio gear to the historical maximum audio gear;
and if the current audio gear is smaller than the recent maximum audio gear and/or the historical maximum audio gear, updating the historical maximum audio gear to the current audio gear, and adjusting the current audio gear down by one gear.
6. The audio processing method of claim 1, wherein the step of adjusting the current audio gear if the current audio amplitude exceeds the audio amplitude range comprises:
and if the current audio amplitude is smaller than the lower limit of the audio amplitude range, the current audio gear is shifted up by N, and N is larger than or equal to 1.
7. The audio processing method according to claim 1, wherein the camera stores recent maximum audio amplitude values and historical maximum audio amplitude values, and after obtaining current audio amplitude values and current audio gear positions according to the collected current audio signals, the method further comprises:
comparing the current audio amplitude to the recent maximum audio amplitude and a historical maximum audio amplitude;
updating the recent maximum audio amplitude to the current audio amplitude if the current audio amplitude is greater than the recent maximum audio amplitude and not greater than the historical maximum audio amplitude;
updating the recent maximum audio amplitude and the historical maximum audio amplitude to the current audio amplitude if the current audio amplitude is greater than the recent maximum audio amplitude and the historical maximum audio amplitude.
8. A camera is characterized by comprising an audio input circuit, an adjustable voltage division circuit and a digital signal processor; the audio input circuit is electrically connected with the adjustable voltage division circuit, and the adjustable voltage division circuit is in communication connection with the digital signal processor;
the audio input circuit is used for acquiring a current audio signal, acquiring a current audio amplitude and a current audio gear and sending the current audio amplitude and the current audio gear to the adjustable voltage division circuit;
the digital signal processor is used for acquiring a current audio amplitude and a current audio gear obtained by the adjustable voltage division circuit, judging whether the current audio amplitude is within a set audio amplitude range to generate a corresponding control signal, and sending the control signal to the adjustable voltage division circuit;
the adjustable voltage division circuit is used for adjusting the audio frequency gear and the current audio frequency amplitude according to the control signal.
9. The camera of claim 8, wherein the adjustable voltage divider circuit is a single digital potentiometer or a plurality of digital potentiometers combined in series for dividing the current audio signal.
10. The camera of claim 8, further comprising a camera device and a data memory;
the camera device is in communication connection with the data storage device and is used for collecting image information and sending the image information to the data storage device for storage;
the data memory is in communication connection with the adjustable voltage division circuit and is used for receiving the processed audio signal sent by the adjustable voltage division circuit.
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| CN1614883A (en) * | 2004-12-02 | 2005-05-11 | 上海交通大学 | Automatic volume amplitude limiter with automatic gain controlling function |
| JP2012134804A (en) * | 2010-12-22 | 2012-07-12 | Lapis Semiconductor Co Ltd | Circuit for automatic level adjustment of audio signal |
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