KR102067692B1 - Method and apparatus generating mixing signal of video and audio - Google Patents

Abstract

Provided are a method for generating a mixed signal of an image and speech and a device thereof. Target samples of a digital speech signal corresponding to the analog speech signals to be included in an analog image signal representing a target frame to generate the mixed signal are determined. The target samples are converted into analog speech signals and the analog speech signals are added to a preset area of the analog image signal.

Description

METHOD AND APPARATUS GENERATING MIXING SIGNAL OF VIDEO AND AUDIO}

The technical field relates to a technique for transmitting an image signal, and more particularly, to a technique for transmitting an analog image signal by converting a digital image signal into an analog image signal.

Methods of transmitting an image may include a method using an open circuit and a method using a closed circuit. Since the method using the open-circuit requires transmitting a video signal to an unspecified number of users, a standardized method may be used to transmit the video. Since a method of transmitting an image using a closed circuit is to transmit an image signal only to a specific user, only a specific user may know a method of transmitting an image signal. When video and audio signals are separately transmitted through separate channels, video and audio signals may be de-synchronized.

One embodiment provides a method and apparatus for generating a mixed signal.

One embodiment provides a method and apparatus for transmitting a mixed signal.

According to an aspect, a mixed signal generation method includes determining target samples of a digital voice signal corresponding to analog voice signals to be included in an analog video signal representing a target frame, and converting the target samples into the analog voice signals. And generating a mixed signal of video and audio by adding the analog audio signals to a preset area of the analog video signal.

The mixed signal generation method may further include obtaining the digital speech signal, and determining the target samples may include determining the target samples corresponding to the target frame among samples of the digital speech signal. It may include.

Determining the target samples corresponding to the target frame among the samples of the digital speech signal may include determining the target samples among the samples of the digital speech signal based on a frame rate of a system. .

Determining the target samples corresponding to the target frame among the samples of the digital speech signal may include determining the target samples among the samples of the digital speech signal based on a frame rate of a system. .

The preset area of the analog video signal may be part of a vertical blanking interval (VBI).

The converting the target samples into the analog speech signals may include converting the target samples into initial analog speech signals using a system frequency, and adding a DC voltage having a predetermined magnitude to the initial analog speech signals. The method may include generating the analog voice signals by performing biasing.

The mixed signal generating method may further include generating analog negative inverted signals by inverting the analog voice signals, and generating the mixed signal may include converting a first signal of the analog audio signals into the analog video signal. Adding to a first area, and adding a second signal of the analog negative inverted signals corresponding to the first signal to a second area of the analog video signal, wherein the first area and the second area are included. The regions may be adjacent to each other.

The mixed signal generating method may further include transmitting the mixed signal to a mixed signal receiving apparatus using a cable, wherein the bandwidth of the mixed signal may be determined based on the maximum transmission bandwidth of the cable.

The mixed signal generating device, the mixed signal receiving device and the cable may be included in a closed circuit system.

The resolution of the analog video signal may be one of high definition (HD), full HD (FHD), ultra HD (UHD), and 4k UHD.

The mixed signal generating method may further include receiving a digital video signal from an image capturing apparatus, and converting the digital video signal into the analog video signal.

According to another aspect, an apparatus for generating a mixed signal includes a memory in which a program for generating a mixed signal is recorded, and a processor for executing the program, wherein the program includes an analog audio signal to be included in an analog video signal representing a target frame Determining target samples of the digital audio signal corresponding to the signals, converting the target samples into the analog audio signals, and adding the analog audio signals to a preset region of the analog video signal. Generating a mixed signal of may be performed.

The program further includes acquiring the digital speech signal, and determining the target samples comprises determining the target samples corresponding to the target frame among samples of the digital speech signal. Can be.

The program further includes acquiring the digital speech signal, and determining the target samples comprises determining the target samples corresponding to the target frame among samples of the digital speech signal. Can be.

The preset area of the analog video signal may be part of a vertical blanking interval (VBI).

The program further includes generating analog negative audio signals by inverting the analog audio signals, wherein generating the mixed signal comprises: converting the first signal of the analog audio signals to a first region of the analog video signal; And adding a second signal of the analog negative inverted signals corresponding to the first signal to a second region of the analog video signal, wherein the first region and the second region are mutually opposite. May be adjacent.

Methods and apparatus for generating a mixed signal may be provided.

Methods and apparatus for transmitting mixed signals may be provided.

1 is a block diagram of a system for transmitting and receiving a mixed signal according to an example.
2 is a schematic diagram of an apparatus for generating a mixed signal according to an example.
3 illustrates a frame represented by a digital video signal according to an example.
4 illustrates an analog video signal according to an example.
5 is a block diagram of an apparatus for generating a mixed signal of video and audio according to an exemplary embodiment.
6 is a flowchart of a method of generating a mixed signal of an image and an audio according to an exemplary embodiment.
7 illustrates samples of a digital voice signal according to an example.
8 is a flowchart of a method of generating analog voice signals according to an example.
9 illustrates an initial analog voice signal and an analog voice signal according to an example.
10 illustrates a mixed signal to which an analog audio signal is added within a vertical retrace period of an analog video signal according to an example.
11 is an analog voice signal added to a vertical line of a vertical retrace period according to an example.
12 is a flowchart of a method of generating a mixed image based on analog voice inversion signals according to an example.
13 illustrates a mixed signal including an analog voice signal and an analog voice inverted signal according to an example.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. However, various changes may be made to the embodiments so that the scope of the patent application is not limited or limited by these embodiments. It is to be understood that all changes, equivalents, and substitutes for the embodiments are included in the scope of rights.

The terminology used herein is for the purpose of description and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the embodiment, when it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

1 is a block diagram of a system for transmitting and receiving a mixed signal according to an example.

The system 100 for transmitting and receiving a mixed signal (hereinafter, the system for transmitting and receiving the mixed signal is outlined as the system 100) includes a mixed signal generating device 130 and a mixed signal receiving device ( 150).

The mixed signal generation device 130 receives an image signal from the camera 110. For example, the camera 110 may generate a digital video signal by photographing a scene. The resolution of the generated digital video signal may be one of high definition (HD), full HD (FHD), ultra HD (UHD), and 4k UHD.

The mixed signal generator 130 receives a voice signal from the microphone 120. For example, the microphone 120 may generate a digital voice signal.

According to one aspect, the system 100 may be part of a closed circuit system, and the mixed signal generation device 130 and the mixed signal receiving device 150 may exchange signals via the cable 140. For example, the cable 140 may be a coaxial cable. Closed circuit systems, unlike open circuit systems that transmit and receive video signals to an unspecified number, may deliver video signals to specific users for specific purposes. According to an embodiment, an analog transmission scheme may be used for the security and accuracy of the signal. The signal used for transmission in a closed circuit system may be a composite signal.

When transmitting an analog signal through a cable, one channel can transmit only one signal. At least two channels are required for separately transmitting an audio signal and a video signal. When the audio signal and the video signal are combined into one signal, only one channel is used. Hereinafter, a method of generating and transmitting a mixed signal combining a voice signal and a video signal will be described in detail with reference to FIGS. 2 to 12.

2 is a schematic diagram of an apparatus for generating a mixed signal according to an example.

The mixed signal generator 200 includes a signal separator 210, a timing controller 220, a luminance processor 230, a color difference processor 240, a subcarrier generator 250, a modulator 260, a frequency converter 270, and a voice. A signal processor 280 and a digital analog converter (DAC) 290. Signal separator 210, timing controller 220, luminance processor 230, chrominance processor 240, subcarrier generator 250, modulator 260, frequency converter 270, speech signal processor 280 and DAC ( Each of 290 may be implemented by a physical device or software.

The signal separator 210 may separate a digital image signal into a luminance signal, a color difference signal, and a timing signal.

The timing controller 220 may generate a vertical reference signal and a horizontal reference signal so that the timing signal may include a vertical reference signal and a horizontal reference signal of the analog image signal.

The luminance processor 230 may convert the color space of the YCBCR domain into the YUV domain. The converted luminance signal may exist over the entire region of the sampling frequency. The first signal is generated by merging the timing signal and the converted luminance signal.

The color difference processor 240 may convert the color space of the YCBCR domain into the color difference signal of the YUV domain.

The subcarrier generator 250 generates a subcarrier. The frequency of the subcarrier may be a preset frequency according to frequency interleaving. For example, the frequency of the subcarrier may be 10 MHz or more.

The modulator 260 may modulate the color difference signal using subcarriers. The modulated color difference signal may be included in a bandwidth of a preset size centered on the subcarrier. The second signal is generated by merging the subcarriers and the modulated chrominance signal.

The frequency converter 270 generates a digital speech signal by sampling the speech signal. The digital speech signal includes a plurality of samples. For example, the sampling rate may be 8000 or 16000. That is, 8000 or 16000 samples may be generated for a 1 second long speech signal.

The audio signal processor 280 converts the samples to be included in the analog video signal into a third signal corresponding to the analog audio signal.

The DAC 290 generates a mixed signal by converting a signal in which the first signal, the second signal, and the third signal are merged into an analog signal.

In the following, a method of generating a mixed signal is described in detail with reference to FIGS. 5 to 12.

3 illustrates a frame represented by a digital video signal according to an example.

The digital video signal may represent one frame 300. The frame 300 corresponds to a scene represented by a plurality of pixels at the same time. The frame 300 may include lines in the vertical direction and may include blanks and actives in the horizontal direction. The hatched area of FIG. 3 may be an active area.

In the horizontal direction, a blank may mean an end of active video signal (EAV) to a start of active video signal (SAV). The blank length in one line can be adjusted by the number of samples the blank contains. When the blank length is reduced, the period of active can be shortened.

Even when the first digital timing of the digital video signal is converted to the second digital timing, the number of lines may not change. For example, even when the number of blank samples is converted, the total number of lines of the digital image signal may be 750, and the number of active lines may be 720.

According to an embodiment, when the number of active lines is 720, the number of active samples of one line may be 1280. Although FIG. 3 illustrates the specification of the digital video signal in which the number of vertical lines is 750, the description of FIG. 3 illustrates the specification of the digital video signal in which the number of vertical lines is 1125 and the number of lines in the vertical direction is 1250. The modified digital video signal may be similarly modified and applied.

For example, the number of active lines of the digital image signal in which the number of vertical lines is 1125 or 1250 may be 1080. When the number of active lines is 1080, the number of active samples of one line may be 1920. FIG.

4 illustrates an analog video signal according to an example.

For example, the illustrated analog image signal 400 may be an analog signal corresponding to the frame 300 illustrated in FIG. 3. The analog video signal 400 includes 750 lines. The lines may be lines from the top of the frame 300 to the bottom of the frame 300. That is, line 1 may be the top line of the frame 300.

Lines 1 to 5 may be serration pulses. The serration pulse may be a vertical sync pulse.

Lines 6 through 10 may be post equalizing pulses. The equalizing pulse may be a pulse used to make interlaced scans accurate. Lines 746 through 750 may be pre-equalizing pulses.

Lines 11 to 25 may be a vertical blanking interval (VBI).

Lines 26 through 745 may be active lines. The active lines may include the actual video signal.

Although FIG. 4 illustrates a timing specification in which the number of lines in the vertical direction is 750, the description of FIG. 4 is similar to the timing specification in which the number of lines in the vertical direction is 1125 and a timing specification in which the number of lines in the vertical direction is 1250. It can be modified and applied.

For example, if the number of lines in the vertical direction is 1125, lines 1 to 5 are serration pulses, lines 6 to 10 are post-equalizing pulses, lines 11 to 40 are vertical retrace periods, and lines 41 to 1120 are active lines. And lines 1121-1125 can be pre-equalizing pulses.

As another example, when the number of lines in the vertical direction is 1250, lines 1 to 5 are serration pulses, lines 6 to 10 are post-equalizing pulses, lines 11 to 165 are vertical retrace periods, and lines 166 to 1245 are active lines. And lines 1246-1250 can be pre-equalizing pulses.

5 is a block diagram of an apparatus for generating a mixed signal of video and audio according to an exemplary embodiment.

The mixed signal generator 500 includes a communication unit 510, a processor 520, and a memory 530. For example, the mixed signal generator 500 may correspond to the mixed signal generator 130 or the mixed signal generator 200 described above with reference to FIG. 1.

The communication unit 510 is connected to the processor 520 and the memory 530 to transmit and receive data. The communication unit 510 may be connected to another external device to transmit and receive data. Hereinafter, the expression “transmitting / receiving“ A ”may refer to transmitting / receiving“ information or data indicating A ”.

The communication unit 510 may be implemented as a circuit in the mixed signal generation device 500. For example, the communication unit 510 may include an internal bus and an external bus. As another example, the communication unit 510 may be an element connecting the mixed signal generation device 500 and an external device. The communication unit 510 may be an interface. The communication unit 510 may receive data from an external device and transmit data to the processor 520 and the memory 530.

The processor 520 processes data received by the communication unit 510 and data stored in the memory 530. A "processor" may be a data processing device implemented in hardware having circuitry having a physical structure for performing desired operations. For example, desired operations may include code or instructions included in a program. For example, data processing devices implemented in hardware may include a microprocessor, a central processing unit, a processor core, a multi-core processor, and a multiprocessor. , An application-specific integrated circuit (ASIC), and a field programmable gate array (FPGA).

Processor 520 executes computer readable code (eg, software) stored in memory (eg, memory 530) and instructions caused by processor 520.

The memory 530 stores data received by the communication unit 510 and data processed by the processor 520. For example, the memory 530 may store a program (or an application or software). The stored program may be a set of syntaxes that are coded to generate a mixed image and executable by the processor 520.

According to one aspect, the memory 530 may include one or more volatile memory, nonvolatile memory and random access memory (RAM), flash memory, hard disk drive, and optical disk drive.

The memory 530 stores a set of instructions (eg, software) for operating the mixed signal generator 500. The instruction set for operating the mixed signal generation device 500 is executed by the processor 520.

The communication unit 510, the processor 520, and the memory 530 are described in detail with reference to FIGS. 6 to 12 below.

6 is a flowchart of a method of generating a mixed signal of an image and an audio according to an exemplary embodiment.

Steps 610 to 660 below are performed by the mixed signal generation apparatus 500 described above with reference to FIG. 5.

In operation 610, the mixed signal generating apparatus 500 obtains a digital image signal. For example, the mixed signal generation apparatus 500 may receive a digital image signal from the camera 110. The resolution of the digital video signal may be one of HD, FHD, UHD, and 4k UHD. The digital video signal may be a signal corresponding to the target frame.

In operation 620, the mixed signal generating apparatus 500 converts the digital video signal into an analog video signal. The resolution of the analog video signal may be one of HD, FHD, UHD, and 4k UHD. A process for converting a digital video signal into an analog video signal is described below.

The mixed signal generator 500 may separate the digital image signal into a timing signal, a luminance signal, and a color difference signal. The timing signal is a signal related to the sync of the analog video signal when the digital video signal is converted into the analog video signal. The timing signal may be a synchronization signal. The timing signal may include at least one of vertical sync and horizontal sync of the analog video signal.

The mixed signal generator 500 may convert the luminance signal into a luminance frequency signal. The converted luminance frequency signal may have a first frequency band. The mixed signal generator 500 may convert a luminance signal into a luminance frequency signal using a luminance filter. The luminance frequency signal separated from the image signal may be generated based on the luminance signal. The luminance frequency signal separated from the image signal may exist in all regions of the frequency. The luminance filter may convert the luminance frequency signal into a luminance frequency signal having a first frequency band. For example, the luminance filter may be a low pass filter having the first frequency as the cut-off frequency. The first frequency may be larger than the channel bandwidth of the standard scheme. For example, the first frequency may be 10 MHz or 10 MHz or more.

The mixed signal generator 500 may convert a color difference signal into a color difference frequency signal. The converted color difference frequency signal may have a second frequency band. The mixed signal generator 500 may convert a color difference signal into a color difference frequency signal using a color difference filter. The color difference frequency signal separated from the image signal may be generated based on the color difference signal. The color difference frequency signal separated from the image signal may exist in the entire region of the frequency. The color difference filter may convert a color difference frequency signal into a color difference frequency signal having a second frequency band. For example, the color difference filter may be a low-pass filter having a second frequency as the cut-off frequency. The second frequency may be smaller than the first frequency. For example, the second frequency may be 2 MHz or less.

The mixed signal generating apparatus 500 may modulate the color difference frequency signal using the subcarrier. For example, the mixed signal generator 500 may modulate the chrominance frequency signal so that the chrominance frequency signal has a third frequency band by using a subcarrier. When the modulated chrominance frequency signal has a third frequency band, the frequency of the subcarrier may be an intermediate frequency of the second frequency band. For example, when the third frequency band is 11 to 13 MHz, the frequency of the subcarrier may be 12 MHz. The frequency of the subcarrier can be set using frequency interpolation.

The mixed signal generator 500 may generate a modulated image signal using the luminance frequency signal and the modulated color difference frequency signal. For example, the mixed signal generator 500 may generate a modulated image signal using a luminance frequency signal, a modulated color difference frequency signal, and a timing signal. According to an aspect, the mixed signal generator 500 may generate a modulated image signal by multiplexing the luminance frequency signal and the modulated color difference signal.

The mixed signal generator 500 may convert a modulated video signal into an analog video signal. The bandwidth of the analog video signal may be determined based on the maximum transmission bandwidth of the cable.

Steps 630 through 650 may be performed in parallel with steps 610 and 620 described above.

In operation 630, the mixed signal generator 500 obtains a digital voice signal. For example, the mixed signal generator 500 may receive a digital voice signal from the microphone 120.

In operation 640, the mixed signal generation apparatus 500 determines target samples among samples of the digital speech signal. The target samples may be samples to be included in the analog image signal. That is, the target samples may be samples corresponding to the target frame. A method of determining target samples of samples of the digital speech signal is described in detail with reference to FIG. 7 below.

In step 650, the mixed signal generation apparatus 500 converts the target samples into analog speech signals. A method of converting target samples into analog speech signals is described in detail with reference to FIGS. 8 and 9.

In operation 660, the mixed signal generating apparatus 500 generates a mixed signal of video and audio by adding analog audio signals to the analog video signal. According to an embodiment, the mixed signal generating apparatus 500 may add analog audio signals to a preset area of the analog video signal. For example, the preset area may be part of the vertical retrace period. A method of generating the mixed signal will be described in detail with reference to FIGS. 10 to 12 below.

In operation 670, the mixed signal generating apparatus 500 transmits the generated mixed signal to the mixed signal receiving apparatus. The mixed signal receiving apparatus corresponds to the mixed signal receiving apparatus 150 described above with reference to FIG. 1. The bandwidth of the mixed signal may be determined based on the maximum transmission bandwidth of the cable.

The mixed signal receiving apparatus 150 separates the mixed signal into a video signal and an audio signal. The separated video and audio signals may be output to the user through the monitor and the speaker, respectively.

7 illustrates samples of a digital voice signal according to an example.

The illustrated voice signal 710 is a 1 second long voice signal. For example, the voice signal 710 may be a signal to be obtained by the microphone 120. The microphone 120 may receive the voice signal 710 and generate quantized data corresponding to the level of the voice signal 710. The quantized data can be a sample. The quantized data may be 10 bits. The number of samples generated is determined by the sampling rate of the microphone 120. When the sampling rate of the microphone 120 is 8000, 8000 samples are generated for the speech signal 710. In the embodiment described with reference to FIG. 7, the sampling rate is 600.

The digital voice signal 720 includes a plurality of samples. The illustrated digital voice signal 720 includes a plurality of samples corresponding to the length of the voice signal 710. For example, the digital voice signal 720 includes 600 samples.

Target samples 721 of the samples of the digital voice signal 720 may be determined based on the frame rate of the system 100 or the camera 110. For example, if the frame rate is 30, the samples of the digital voice signal 720 may correspond to 30 frames. On average, 20 samples may correspond to one frame. For example, the earliest first to thirtieth samples 731, 732, 733, 734 of 600 samples correspond to the earliest first frame of thirty frames. When the first frame is the target frame, the first to thirtieth samples 731, 732, 733, and 734 may be determined as the target samples 721.

When the first to thirtieth samples 731, 732, 733, and 734 are determined as the target samples 721 for the target frame, the target samples 721 may be divided into a plurality of groups. Samples in one group correspond to analog voice signals added to one vertical line in the vertical blanking period. For example, the first analog voice signal corresponding to the first to fifth samples in the first group 731 is added to the first vertical line in the vertical retrace period, and the sixth to sixth sample in the second group 732. The second analog voice signal corresponding to the tenth sample is added to the second vertical line of the vertical blanking period, and the third analog voice signal corresponding to the eleventh to fifteenth samples in the third group 733 is the vertical blanking period. A fourth analog voice signal added to the third vertical line of and corresponding to the sixteenth to twentieth samples in the fourth group 734 may be added to the fourth vertical line of the vertical retrace period. The number of samples included in one group and the number of vertical lines of the analog video signal to which the analog audio signal is added may vary according to embodiments.

The number of target samples corresponding to the target frame is described below with reference to [Table 1].

Sampling rate 8000 / second Frame rate
(Frames / sec) 25 30 50 60 Per 1 frame 320 266.6667 160 133.3333 Per 2 frames 640 533.3333 320 266.6667 Per 3 frames 960 800 480 400 Frame sampling sequence First frame 320 267 160 133 Second frame 320 266 160 133 Third frame 320 267 160 134

If the sampling rate is 8000 / second and the 8000 samples have frame rates of 25 frames / second and 30 frames / second, the samples may be evenly distributed in each frame. However, when the frame rates are 30 frames / second and 60 frames / second, the samples cannot be evenly distributed in each frame. In this case, the samples included in the frame may be distributed based on a preset rule. For example, when the frame rate is 30 frames / second, 267 samples in the first frame, 266 samples in the second frame, and 267 samples in the third frame may be distributed.

8 is a flowchart of a method of generating analog voice signals according to an example.

Step 650 described above with reference to FIG. 6 includes steps 810 and 820 below.

In step 810, the mixed signal generation apparatus 500 converts target samples into initial analog speech signals using the system frequency. According to the embodiment of FIG. 7, the apparatus 500 for generating mixed signals generates the first group 731 to the fourth group 734 of the target samples 721 from the first initial analog voice signal to the fourth initial analog voice, respectively. Can be converted into a signal.

In operation 820, the mixed signal generating apparatus 500 generates analog voice signals by performing biasing to add a DC voltage having a predetermined magnitude to the initial analog voice signals. A method for generating an analog voice signal based on the initial analog voice signal is described in detail with reference to FIG. 9 below.

9 illustrates an initial analog voice signal and an analog voice signal according to an example.

The initial analog voice signal 910 may be a voltage signal swinging within a voltage of the maximum range. For example, the initial analog voice signal 910 may be a signal having a range of -300 mV to 300 mV.

DC voltage may be added to the initial analog voice signal 910. For example, the direct current voltage may be 300 mV. The analog voice signal 920 is generated by adding a DC voltage to the initial analog voice signal 910.

10 illustrates a mixed signal to which an analog audio signal is added within a vertical retrace period of an analog video signal according to an example.

Analog voice signals 1011, 1012, 1013, and 1014 are added to a preset area within the vertical retrace period 1010 of the mixed signal 1000. Each of the analog voice signals 1011, 1012, 1013, 1014 are different signals. The analog audio signals 1011, 1012, 1013, and 1014 correspond to a scene represented by the target frame corresponding to the analog video signal of the mixed signal 1000.

11 is an analog voice signal added to a vertical line of a vertical retrace period according to an example.

For example, an analog speech signal 1011 is added within the first vertical line of the vertical retrace period of the mixed signal 1000 (eg, the eleventh vertical line of the mixed signal 1000).

Start of Active Audio (SAA) indicates a reference level of the analog voice signal 1011. The active audio area (AAA) may be an actual area to which an analog voice signal 1011 is added. EAA (End of Active Audio) represents the reference level of the analog voice signal 1011.

12 is a flowchart of a method of generating a mixed image based on analog voice inversion signals according to an example.

After step 650 is performed, step 1200 below may be further performed.

In operation 1200, the mixed signal generator 500 generates analog voice inverted signals by inverting analog voice signals.

Step 660 described above with reference to FIG. 6 may include steps 1210 and 1220.

In operation 1210, the mixed signal generating apparatus 500 adds a first signal of the analog audio signals to the first region of the analog video signal. For example, the first region may be the first vertical line of the vertical retrace period (eg, the eleventh vertical line of the mixed signal 1000).

In operation 1220, the mixed signal generating apparatus 500 adds a second signal of the voice inverted signals corresponding to the first signal of the analog voice signals to the second region of the analog video signal. The second signal is a signal obtained by inverting the first signal. For example, the second region may be a second vertical line of the vertical retrace period (eg, the 12th vertical line of the mixed signal 1000). The first region and the second region may be regions adjacent to each other.

The mixed signal receiving apparatus 150 receiving the mixed signal extracts the analog negative inverted signals and the analog negative inverted signals, re-inverts the analog negative inverted signals, and the analog negative inverted signals and the re-inverted analog negative inverted signals. The final analog voice signals are determined based on the signals. For example, when the average is calculated by summing analog negative inverted signals and re-inverted analog negative inverted signals, the added noise is canceled during the signal transmission process.

13 illustrates a mixed signal including an analog voice signal and an analog voice inverted signal according to an example.

Analog voice signals 1310, 1330, 1350, 1370 and analog voice inverting signals 1320, 1340, 1360 in the vertical lines (eg, eleventh through 18th) of the vertical retrace period of mixed signal 1300. , 1380 may be added. When the analog voice signal 1310 is the first signal described above with reference to FIG. 12, the analog voice inverted signal 1320 is the second signal. The analog voice signal 1310 and the analog voice inversion signal 1320 are paired. Similarly, analog voice signal 1330 and analog voice inversion signal 1340 are paired, analog voice signal 1350 and analog voice inversion signal 1360 are paired, analog voice signal 1370 and Analog negative inversion signal 1380 is paired.

The mixed signal receiving apparatus 150 may determine a final analog voice signal for each pair and output a voice signal to a user based on the final analog voice signal.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted. The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

Although the embodiments have been described with reference to the accompanying drawings, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the following claims.

100: system for transmitting and receiving mixed signals
500: mixed signal generator
510: communication unit
520: processor
530: memory

Claims (16)

Performed by the mixed signal generating device,
Determining target samples of the digital audio signal corresponding to the analog audio signals to be included in the analog video signal representing the target frame;
Converting the target samples into the analog speech signals;
Generating analog negative inverted signals by inverting the analog negative signals; And
Generating a mixed signal of video and audio by adding the analog audio signals and the analog audio inverted signals to a preset area of the analog video signal
Including,
Generating the mixed signal,
Adding a first signal of the analog audio signals to a first region of the analog video signal; And
Adding a second signal of the analog negative inverted signals corresponding to the first signal to a second region of the analog video signal;
Including,
Mixed signal generation method.
The method of claim 1,
Acquiring the digital voice signal
More,
Determining the target samples,
Determining the target samples corresponding to the target frame among samples of the digital speech signal
Including,
Mixed signal generation method.
The method of claim 2,
The determining of the target samples corresponding to the target frame among the samples of the digital speech signal may include:
Determining the target samples of samples of the digital speech signal based on a frame rate of the system
Including,
Mixed signal generation method.
The method of claim 1,
The preset region of the analog video signal is part of a vertical blanking interval (VBI),
Mixed signal generation method.
The method of claim 1,
Converting the target samples into the analog voice signals,
Converting the target samples into initial analog speech signals using a system frequency; And
Generating the analog voice signals by performing biasing to add a DC voltage having a predetermined magnitude to the initial analog voice signals.
Including,
Mixed signal generation method.
The method of claim 1,
The first area and the second area are adjacent to each other,
Mixed signal generation method.
The method of claim 1,
Transmitting the mixed signal to a mixed signal receiving apparatus using a cable
More,
The bandwidth of the mixed signal is determined based on the maximum transmission bandwidth of the cable,
Mixed signal generation method.
The method of claim 7, wherein
The mixed signal generating device, the mixed signal receiving device and the cable are included in a closed circuit system,
Mixed signal generation method.
The method of claim 1,
The resolution of the analog video signal is one of high definition (HD), full HD (FHD), ultra HD (UHD), and 4k UHD,
Mixed signal generation method.
The method of claim 1,
Receiving a digital image signal from an image photographing apparatus; And
Converting the digital video signal into the analog video signal
Further comprising,
Mixed signal generation method.
A computer-readable recording medium containing a program for performing the method of any one of claims 1 to 10.
Mixed signal generation device,
A memory in which a program for generating a mixed signal is recorded; And
A processor that executes the program
Including,
The program,
Determining target samples of the digital audio signal corresponding to the analog audio signals to be included in the analog video signal representing the target frame;
Converting the target samples into the analog speech signals;
Generating analog negative inverted signals by inverting the analog negative signals; And
Generating a mixed signal of video and audio by adding the analog audio signals and the analog audio inverted signals to a preset area of the analog video signal
Then,
Generating the mixed signal,
Adding a first signal of the analog audio signals to a first region of the analog video signal; And
Adding a second signal of the analog negative inverted signals corresponding to the first signal to a second region of the analog video signal;
Including,
Mixed signal generator.
The method of claim 12,
The program,
Acquiring the digital voice signal
More,
Determining the target samples,
Determining the target samples corresponding to the target frame among samples of the digital speech signal
Including,
Mixed signal generator.
delete The method of claim 12,
The preset region of the analog video signal is part of a vertical blanking interval (VBI),
Mixed signal generator.
The method of claim 12,
The first area and the second area are adjacent to each other,
Mixed signal generator.

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