JP2010021953A - Video/audio output device and television receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically set an audio environment more optimal for a content in comparison with a case where, for example, the number of audio channels according to user preference or designated at a broadcast station side is defined as a condition. <P>SOLUTION: A video signal and an audio signal synchronized with the video image are received (S301), the content indicated by the received video signal and audio signal is analyzed (S302) and setting information is determined which indicates a frequency specification and a volume of the audio signal corresponding to an analysis result (S303). In accordance with the determined setting information, frequency characteristics of the audio signal are changed (S304) and audio based on the changed frequency characteristics and the video image based on the received video signal are output. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a video / audio output device that receives a video signal and an audio signal, changes a frequency characteristic and / or volume of the audio signal, and outputs audio based on the changed frequency characteristic and / or volume and video based on the video signal, and More particularly, the present invention relates to a television receiver having the video / audio output device, and in particular, a video / audio output device and a television that can change the frequency characteristics and / or volume of the audio according to the content indicated by the received video signal or audio signal. The present invention relates to a receiving device.

  Conventionally, a video / audio output device such as a television receiver, a DVD player or a video deck has a clear voice function for emphasizing a human voice frequency band, a bus enhancer function for emphasizing a low frequency band, and a volume. The audio environment can be set by providing an auto volume function for adjustment and a woofer for outputting the low frequency range of audio. In particular, since the sound environment varies depending on the region such as Europe, Asia or Japan, the setting of the sound environment is an important function.

  However, in the conventional apparatus, since the setting of the voice environment is left to the user's manual operation, it imposes a heavy operation burden on the user, and knowledge about the setting is necessary, so that it can be used by all users. Has the problem of not being able to.

Therefore, conventionally, an apparatus capable of automatically setting the audio environment according to the user's viewing history has been proposed (for example, Patent Document 1). In addition, a device capable of automatically setting the audio environment according to the number of audio channels specified on the broadcast station side has been proposed (for example, Patent Document 2). As a result, the operation burden on the user was reduced and all users could use it.
JP 2000-196970 A JP 2007-142862 A

  However, in the device described in Patent Document 1, the sound environment is merely automatically set according to the user's viewing history, and the optimum sound environment for the content cannot be automatically set. have.

  Further, in the apparatus described in Patent Document 2, the audio environment is automatically set according to the number of audio channels, and the optimum audio environment for content is automatically set in consideration of various conditions. It has the problem that it cannot be done.

  Furthermore, in recent years, environmental problems due to an increase in carbon dioxide have become serious, and in the field of television receivers and the like, it is desired to suppress carbon dioxide emissions by suppressing power consumption. Yes.

  The present invention has been made in view of the circumstances according to the present invention, and its purpose is to analyze the content indicated by the received video signal or audio signal from various aspects, and depending on the result of the analysis, the frequency characteristics of the audio signal and The setting information indicating the volume is determined, the frequency characteristic and / or volume of the audio signal is changed according to the determined setting information, and the audio based on the changed frequency characteristic and / or volume and the video based on the video signal are output. Accordingly, it is an object of the present invention to provide a video / audio output device and a television receiver capable of automatically setting an optimal audio environment for content in consideration of various conditions.

  In order to solve the above-described problem, the video / audio output device includes an input unit that receives a video signal and an audio signal synchronized with the video, a correction unit that changes a frequency characteristic and / or volume of the received audio signal, and a change In the video / audio output device comprising: output means for outputting audio based on the frequency characteristics and / or volume and video based on the video signal; and analyzing means for analyzing content indicated by the video signal and the audio signal; Determining means for determining setting information indicating the frequency specification and volume of the corresponding audio signal, wherein the correction means changes the frequency characteristics and / or volume of the audio signal according to the determined setting information. Requirement.

  In addition, the television receiver is required to include the video / audio output device described above and a tuner that generates a video signal and an audio signal from the radio wave received by the antenna and outputs them to the input means.

  This video / audio output device detects various conditions different from, for example, user preferences or the number of audio channels specified on the broadcasting station side by analyzing the content indicated by the received video signal or audio signal from multiple angles. To do. Further, by determining setting information indicating the frequency characteristics and volume of the audio signal according to the analysis result, and changing the frequency characteristics and / or volume of the audio signal according to the determined setting information, the user's preference or broadcasting station Without being limited to the number of audio channels specified on the side, the optimum audio environment for the content is automatically set based on various conditions.

  In addition, the television receiver includes a video / audio output device described above and a tuner that generates a video signal and an audio signal from radio waves received by an antenna and outputs them to the video / audio output device. Automatically sets the optimal audio environment for the broadcast program.

  The disclosed device can be used by all users without burdening the user and without requiring knowledge about settings, and automatically sets the optimal audio environment for content in consideration of various conditions. Can do.

Embodiment 1 FIG.
DESCRIPTION OF THE PREFERRED EMBODIMENTS A video / audio output device according to the present invention and a television receiver provided with the video / audio output device will be described below with reference to the drawings showing embodiments. FIG. 1 is a block diagram showing the configuration of a television receiver and a video / audio output device according to the present invention.

  FIG. 1 shows a receiver 1 for receiving radio waves, a tuner 2 for generating video and audio signals from the radio waves, a video / audio output device 3, a display 4 for outputting video, and audio. The speaker 5 and the woofer 6 are shown. Each hardware is connected via a communication line. In FIG. 1, a solid line arrow indicates a flow of a video signal or an audio signal, and a dotted line arrow indicates a control signal flow.

  The receiving unit 1 receives a radio wave transmitted from a broadcasting station (not shown) via an antenna 10 connected thereto, and outputs the received radio wave to the tuner 2.

  The tuner 2 receives radio waves from the receiving unit 1, generates a video signal and an audio signal from the received radio waves, and outputs them to a video switch 302 and an audio switch 303 of the video / audio output device 3 described later. The generated video signal and audio signal are either digital signals or analog signals. FIG. 2 is a conceptual diagram showing an example of a stack of digital signals. The digital signal includes a video stack indicated by the video signal, an audio stack indicated by the audio signal, a stack of additional information indicated by the additional signal, and the like. The additional information includes, for example, data indicating the type of content such as news, animation, sports broadcast, or movie. When the tuner 2 generates a digital signal, the tuner 2 extracts an additional signal from the digital signal, and outputs the extracted additional signal and an identification signal indicating the digital signal to the CPU 300 of the video / audio output device described later.

  The video / audio output device 3 receives the video signal and the audio signal output from the tuner 2, analyzes the content indicated by the received video / audio and the audio signal, and sets the frequency characteristics and volume of the audio signal corresponding to the analysis result Determine information. The video / audio output device 3 changes the frequency characteristics and / or volume of the audio signal according to the determined setting information. The video / audio output device 3 outputs audio based on the changed frequency characteristics and volume via the speaker 5 and the woofer 6. The video / audio output device 3 outputs a video based on the video signal via the display 4.

  The video / audio output device 3 includes an input interface (hereinafter referred to as “input IF”) 301 that receives analog video signals and audio signals from the outside, a video switch 302 that exclusively receives video signals from the tuner 2 or the input IF 301, and An audio switch 303 that exclusively receives an audio signal from the tuner 2 or the input IF 301, an HDMI (High-Definition Multimedia Interface) 304 that receives a digital signal from the outside, an HDMI selector 305 that enables the function of the HDMI 304, and the received digital And an HDMI receiver 306 that extracts a video signal, an audio signal, and an additional signal from the signal.

  The video / audio output device 3 exclusively receives a video signal from the video switch 302 or the HDMI receiver 306, analyzes the content indicated by the received video signal, and the video signal received from the video processing unit 307. And a video output interface (hereinafter referred to as “video output IF”) 308.

  The video / audio output device 3 exclusively receives an audio signal from the audio switch 303 or the HDMI receiver 306, analyzes the content indicated by the received audio signal, and the audio signal received from the audio processing unit 309. Amplifiers 310a and 310b that change the frequency characteristics and volume of the audio, an audio output interface (hereinafter referred to as “audio output IF”) 311a that outputs an audio signal received from the amplifier 310a to the speaker 5, and an audio signal received from the amplifier 310b. Is output to the woofer 6.

  Furthermore, the video / audio output device 3 controls the auxiliary storage unit 312 for storing programs and various data, the power supply unit 313 for supplying power to all hardware, and controls all the hardware and stores them in the auxiliary storage unit 312. And a CPU 300 that executes various processes according to a program.

  The video / audio output device 3 receives the video signal and the audio signal by exclusively using the tuner 2, the input IF 301 or the HDMI 304.

  The input IF 301 corresponds to the input means of the present invention, and includes an input terminal for video signals and an input terminal for audio signals, and receives an analog video signal and audio signal, respectively. The input IF 301 outputs the received video signal to the video switch 302 and outputs the received audio signal to the audio switch 303.

  The video switch 302 exclusively receives an analog or digital video signal output from the tuner 2 or an analog video signal output from the input IF 301 and outputs the received video signal to the video processing device 307. When the video switch 302 receives the video signal output from the tuner 2, the video switch 302 becomes an input unit of the present invention.

  The audio switch 303 exclusively receives an analog or digital audio signal output from the tuner 2 or an analog audio signal output from the input IF 301, and outputs the received audio signal to the audio processing unit 309. The audio switch 303 corresponds to the input unit of the present invention when receiving the audio signal output from the tuner 2.

  The HDMI 304 corresponds to the input means of the present invention, and accepts digital signals including video signals, audio signals, and additional signals.

  The HDMI selector 305 outputs a request to validate the function of the HDMI 304 to the CPU 300 when the HDMI 304 receives a digital signal. As a result, the video / audio output device 3 can receive the video signal and the audio signal by exclusively using the tuner 2, the input IF 301 or the HDMI 304.

  The HDMI receiver 306 extracts a video signal, an audio signal, and an additional signal from the digital signal received via the HDMI 304. The HDMI receiver 306 outputs an identification signal indicating the extracted additional signal and digital signal to the CPU 300. The HDMI receiver 306 outputs the extracted video signal to the video processing unit 307 and outputs the extracted audio signal to the audio processing unit 309.

  When receiving an additional signal and an identification signal indicating a digital signal, the CPU 300 analyzes the content type indicated by the additional signal, and determines setting information corresponding to the analyzed content type. A method for determining the setting information will be described later.

  The video processing unit 307 exclusively receives the video signal output from the video switch 302 or the video signal output from the HDMI receiver 306, and outputs the received video signal to the video output IF 308. When the CPU 300 has not received an identification signal indicating a digital signal, that is, when an analog video signal is received, the video processing unit 307 analyzes the content indicated by the received video signal and outputs the analysis result to the CPU 300. Hereinafter, the configuration and operation of the video processing unit 307 will be described. FIG. 3 is a block diagram showing a configuration of the video processing unit 307.

  The video processing unit 307 includes a black band discriminating unit 3070 for discriminating the screen size indicated by the video signal, a character recognition unit 3071 for recognizing text of the character broadcast, and a WSS (Wide Screen Signaling) signal for designating the video aspect ratio. A WSS detection unit 3072 for detecting, a motion vector determination unit 3073 for determining a motion vector between frames of a video, and a histogram detection unit 3074 for detecting a luminance distribution of the video. Each part is mutually connected by a communication line (not shown). The relationship between each part will be described later.

  The black belt determination unit 3070 determines whether or not the received video signal includes a control signal for outputting a letterbox type video. Thereby, the black band discriminating unit 3070 can discriminate the screen size indicated by the received video signal. FIG. 4 is a schematic diagram for explaining video types. Black bands are added to the top, bottom, left, and right of the originally captured video portion in order to achieve display compatibility with the screen size standard in the video display screen size. Letterbox type video refers to video with black bands added at the top and bottom of the video portion, for example, content for movies and sports broadcasts (see FIG. 4A). The black belt determination unit 3070 may determine other screen sizes such as a pillar box type and a frame broadcast type. Pillar box type video refers to video with black bands added to the left and right of the video portion, for example, animation content (see FIG. 4B). A frame broadcast type video is a video in which black bands are added to the top, bottom, left, and right of the video portion, for example, news content (see FIG. 4C). The CPU 300 determines setting information according to the screen size.

  The character recognition unit 3071 determines whether or not the received video signal includes a character broadcast signal. When the character recognition unit 3071 determines that the received video signal is a character broadcast signal, the character recognition unit 3071 recognizes a character displayed on the video indicated by the video signal. Execute the process. The teletext signal is superimposed on the vertical blanking period of the analog video signal. FIG. 5 is a schematic diagram showing an example of characters displayed on the video indicated by the video signal. For example, when a phrase in an expression format used in the news report field such as “Headline News” or “Topic” is displayed (see FIG. 5), the content of the news corresponds to “Grand Slam” or “Points”. When a phrase of an expression format used in the sports field is displayed, the content of sports broadcast corresponds, and when a phrase of colloquial expression such as slang is displayed, the content of a movie corresponds. CPU 300 determines setting information according to a phrase in a predetermined expression format.

  FIG. 6 is a flowchart showing the procedure of character recognition processing. The character recognition unit 3071 extracts one frame of video from the video indicated by the video signal (S101), and removes blurring of characters displayed on the extracted video (S102). This is because analog video signals are inherently easy to blur boundaries, and are intentionally blurred by anti-aliasing to make characters appear smooth in a low-resolution television receiver. The character recognition unit 3071 extracts a specific line width portion that is a line having a specific width from the video (S103), and further extracts a specific line width portion concentration region where the specific line width portion is concentrated (S104). This is because a character is composed of a line having a specific width and can be considered to exist in an area where the line is dense.

  The character recognizing unit 3071 checks the validity of the character area as to whether or not the extracted area is valid as a character area (S105), and if it is judged to be valid, extracts the character feature points included in the area. (S106). The character recognizing unit 3071 recognizes a character by specifying a character that matches the extracted feature point of the character based on a comparison table (not shown) stored in the auxiliary storage unit 312 (S107). . The character recognizing unit 3071 returns to step S101, extracts the video of the next frame, and executes the processing after step S102. Note that the comparison table stores characters and feature points of the characters in association with each other.

  The WSS detection unit 3072 detects a WSS signal that specifies the aspect ratio of the video indicated by the video signal. WSS is data for adjusting video to an aspect ratio designated by a broadcasting station, and is superimposed on an analog video signal. The WSS detection unit 3072 analyzes the content by detecting information of a video start position indicating the top or center included in the WSS. For example, when the WSS includes a video start position indicating the top, it corresponds to movie content. The CPU 300 determines setting information corresponding to the analysis result.

  The motion vector determination unit 3073 executes a motion vector determination process for determining a motion vector between frames of a video indicated by the video signal. As a result, the CPU 300 determines the setting information so that the sound output becomes dynamic as the motion vector increases.

  FIG. 7 is a flowchart showing the procedure of the motion vector discrimination process. The motion vector determination unit 3073 extracts one frame of video from the video indicated by the video signal (S201), and extracts feature points of the extracted video (S202). The motion vector discriminating unit 3073 reads out the feature points of the previous frame stored in the auxiliary storage unit 312 (S203), and moves between the frames based on the difference between the extracted feature points of the video and the feature points of the read previous frame. A vector is derived (S204). The motion vector determination unit 3073 deletes the feature points of the previous frame stored in the auxiliary storage unit 312 and stores the feature points of one frame extracted in step S201 in the auxiliary storage unit 312 (S205). The motion vector determination unit 3073 returns to step S201, extracts the video of the next frame, and executes the processing from step S202 onward.

  The histogram detection unit 3074 detects the luminance distribution of the video indicated by the video signal. FIG. 8 is a graph for explaining an example of the luminance distribution of an image. The histogram detection unit 3074 detects the luminance Y for a frame for a predetermined time. The histogram detection unit 3074 calculates the luminance Y using the following expression 1, for example.

Y = 0.30R + 0.59G + 0.11B (1)
However, R is a red signal, G is a green signal, and B is a blue signal.

Further, the histogram detection unit 3074 averages the detected luminance. For example, the histogram detection unit 3074 calculates the average luminance Y _AVE using Equation 2 below.

Y _AVE = Σ (Y × n _Y ) / Σn _Y (2)
However, the average luminance is Y _AVE , the luminance is Y, and the number of pixels in each gradation is n _Y.

  The histogram detection unit 3074 counts the number of pixels in steps of 8 gradations, thereby creating a luminance distribution on a two-dimensional coordinate plane with the horizontal axis as the gradation and the vertical axis as the number of pixels (see FIG. 8). ). For example, when the luminance distribution is flat (see FIG. 8A), news content shot in a studio in which white and black are harmonized corresponds. Further, when the luminance distribution is a Gaussian distribution (see FIG. 8B), sports broadcast content such as soccer or baseball in which the green of the lawn occupies most of the video corresponds. In addition, when the luminance distribution is descending to the right (see FIG. 8C), it corresponds to movie content with many dark scenes. The CPU 300 determines setting information corresponding to the analysis result.

  The audio processing unit 309 exclusively receives the audio signal output from the audio switch 303 or the audio signal output from the HDMI receiver 306, and outputs the received audio signal to the amplifiers 310a and 310b. When the CPU 300 does not accept an identification signal indicating a digital signal, that is, when an analog audio signal is received, the audio processing unit 309 analyzes the content indicated by the received audio signal and outputs the analysis result to the CPU 300. Hereinafter, the configuration and operation of the audio processing unit 309 as analysis means will be described. FIG. 9 is a block diagram showing the configuration of the audio processing unit 309.

  The audio processing unit 309 includes an audio multiplex determination unit 3090 that determines whether the audio signal is a multiplex signal that can be broadcast in two languages, and a frequency distribution detection unit 3091 that detects the frequency distribution of the audio indicated by the audio signal. And a commercial discriminating unit 3092 for detecting a state where the audio signal is switched from a multiplex signal capable of bilingual broadcasting to a multiplex signal capable of stereo broadcasting. Each part is mutually connected by a communication line (not shown). The relationship between each part will be described later.

  The audio multiplexing determination unit 3090 determines whether or not the audio signal is a multiplexed signal capable of bilingual broadcasting. This is because in the case of bilingual broadcasting, the audio signals of the first and second languages are multiplexed on the audio signal. For example, in the case of bilingual broadcasting, news content is applicable. The CPU 300 determines setting information corresponding to the analysis result.

  The frequency distribution detection unit 3091 detects the frequency distribution of the voice indicated by the voice signal. FIG. 10 is a graph for explaining an example of the frequency distribution of speech. The frequency distribution detection unit 3091 creates the detected frequency distribution as a two-dimensional coordinate plane in which the horizontal axis is audio frequency (Hz) and the vertical axis is decibel (dB). For example, since the Japanese frequency is 200 to 2,000 (Hz), when the frequency distribution is concentrated in this frequency band, news content in which the announcer reads the Japanese manuscript corresponds (see FIG. 10). ). The CPU 300 determines setting information corresponding to the analysis result. Since the frequency of English is 2,000 to 12,000 (Hz), when the frequency distribution is concentrated in this frequency band, the content of news that the announcer reads the English manuscript corresponds.

  The commercial discriminating unit 3092 detects a state in which the audio signal is switched from a multiplexed signal capable of bilingual broadcasting to a multiplexed signal capable of stereo broadcasting. Since the audio signal is multiplexed with an identification signal for distinguishing a multiplexed signal capable of bilingual broadcasting and a multiplexed signal capable of stereo broadcasting, the commercial discriminating unit 3092 detects when this identifying signal is detected. It is determined that the bilingual broadcasting is switched to the stereo broadcasting. Since the commercial within the program frame is broadcasted in stereo, the state of switching from the bilingual broadcast to the stereo broadcast corresponds to the commercial content. The CPU 300 determines setting information corresponding to the analysis result. Particularly in Europe, since the volume of commercials tends to increase, the setting information is set so as to lower the volume during commercials using the auto volume function.

  The amplifier 310a and the amplifier 310b correspond to correction means of the present invention, and are acoustic devices that change the frequency characteristics and volume of the audio signal received from the audio processing unit 309 according to the setting information determined by the CPU 300. The amplifiers 310a and 310b have a clear voice function for emphasizing a human voice frequency band, a bus enhancer function for emphasizing a low frequency band, an auto volume function for adjusting the volume, and the like. The amplifier 310 a outputs an audio signal to the speaker 5, and the amplifier 310 b outputs an audio signal to the woofer 6. The amplifiers 310a and 310b operate by receiving power supply from the power supply unit 313, and stop when power supply from the power supply unit 313 is stopped. The CPU 300 corresponds to a power supply control unit from the power supply unit 313.

  The speaker 5 and the woofer 6 correspond to output means of the present invention. The speaker 5 and the woofer 6 operate by receiving power supply from the power supply unit 313 and stop when power supply from the power supply unit 313 is stopped. The woofer 6 corresponds to the bass output unit of the present invention, and stops the sound output when the power supply to the amplifier 310b and the woofer 6 is stopped. As a result, unnecessary power consumption can be suppressed.

  Thus, the video / audio output device 3 includes the hardware described above, and the hardware is controlled by the CPU 300 to determine setting information corresponding to the analysis result and change the frequency characteristics and volume of the audio signal. The voice change process is executed. Hereinafter, the procedure of the audio change process executed by the video / audio output device 3 will be described. FIG. 11 is a flowchart showing the procedure of the audio change process executed by the video / audio output device 3 according to the first embodiment.

  The CPU 300 of the video / audio output device 3 receives a video signal and an audio signal via the input IF 301, the video switch 302, the audio switch 303, or the HDMI 304 (S301). The CPU 300 executes content analysis processing for analyzing the content indicated by the received video signal or audio signal (S302). The procedure of content analysis processing will be described later.

  The CPU 300 determines setting information corresponding to the analysis result (S303), and changes the frequency characteristics of the audio signal according to the determined setting information (S304). Further, the CPU 300 changes the volume according to the determined setting information (S305), and controls the power supply to the woofer 6 (S306). The CPU 300 ends the process.

  Next, the procedure of the content analysis process executed in step S302 will be described. 12 and 13 are flowcharts showing the procedure of the content analysis process executed by the video / audio output apparatus 3.

  The CPU 300 of the video / audio output device 3 determines whether the received video signal or audio signal is a digital signal, that is, whether additional information exists (S401). If the CPU 300 determines that additional information exists (YES in S401), the CPU 300 outputs the content type indicated by the additional information as an analysis result (S402). The CPU 300 waits until a next processing request is made.

  On the other hand, when CPU 300 determines that the additional information does not exist (NO in S401), whether or not the received video signal includes a control signal for outputting a video such as a letterbox, that is, the video indicated by the video signal. It is determined using the black band discriminating unit 3070 whether or not there is a black band (S403). As a result, when the CPU 300 determines that a black band is present in the video indicated by the video signal (YES in S403), the CPU 300 determines the type of the video (S404) and outputs the determined video type as an analysis result (S402). . The CPU 300 waits until a next processing request is made.

  On the other hand, if the CPU 300 determines that there is no black belt in the video indicated by the video signal (NO in S403), the CPU 300 determines whether or not the received audio signal is a multiplexed signal capable of bilingual broadcasting. A determination is made using 3090 (S405). As a result, if the CPU 300 determines that the received audio signal is a multiplexed signal capable of bilingual broadcasting (YES in S405), the CPU 300 outputs an analysis result indicating bilingual broadcasting (S402). The CPU 300 waits until a next processing request is made.

  On the other hand, if the CPU 300 determines that the received audio signal is not a multiplexed signal capable of bilingual broadcasting (NO in S405), the CPU 300 determines whether or not the received video signal is a character broadcast signal. It judges using (S406). As a result, if the CPU 300 determines that the received video signal is a text broadcast (YES in S406), the CPU 300 recognizes the character displayed in the video indicated by the video signal using the character recognition unit 3071 (S407). The CPU 300 outputs an analysis result of character recognition (S402) and waits until a next processing request is made.

  On the other hand, when CPU 300 determines that the received video signal is not a text broadcast (NO in S406), CPU 300 determines whether or not the received video signal includes a WSS signal (S408). As a result, when CPU 300 determines that the received video signal includes the WSS signal (YES in S408), CPU 300 determines the video start position indicated by WSS (S409). The CPU 300 outputs an analysis result of the determined video start position (S402) and waits until a next processing request is made.

  On the other hand, if the CPU 300 determines that the received video signal does not include the WSS signal (NO in S408), the CPU 300 determines whether the motion vector between frames can be analyzed using the motion vector determination unit 3073. (S410). As a result, if the CPU 300 determines that the motion vector between frames can be analyzed (YES in S410), the CPU 300 derives a motion vector between frames (S411). The CPU 300 outputs the motion vector analysis result (S402) and waits until a next processing request is made.

  On the other hand, when determining that the motion vector between frames cannot be analyzed (NO in S410), the CPU 300 determines whether the frequency distribution analysis of the voice is possible using the frequency distribution detection unit 3091 (S412). ). As a result, if the CPU 300 determines that the voice frequency distribution analysis is possible (YES in S412), the CPU 300 derives the voice frequency distribution (S413). The CPU 300 outputs the analysis result of the frequency distribution of the voice (S402), and waits until the next processing is requested.

  On the other hand, when CPU 300 determines that the frequency distribution analysis of the sound is impossible (NO in S412), CPU 300 detects a state in which the sound signal is switched from the bilingual broadcast to the stereo broadcast using commercial determination unit 3092 (S414). ). As a result, when the CPU 300 detects a state in which the audio signal is switched from the bilingual broadcast to the stereo broadcast (YES in S414), the CPU 300 outputs the analysis result of the switching state (S402). The CPU 300 waits until a next processing request is made.

  On the other hand, when the state in which the audio signal is switched from the bilingual broadcast to the stereo broadcast cannot be detected (NO in S414), the CPU 300 uses the histogram detection unit 3074 to determine whether the luminance distribution analysis of the video is possible. (S415). As a result, when CPU 300 determines that the luminance distribution analysis of the video is possible (YES in S415), CPU 300 derives the luminance distribution of the video (S416). The CPU 300 outputs the analysis result of the luminance distribution of the video (S402), and waits until there is a request for the next processing.

  On the other hand, if CPU 300 determines that the luminance distribution analysis of the video is impossible (NO in S415), CPU 300 outputs a notification indicating that analysis is impossible (S417), and waits for a request for the next process.

  The CPU 300 determines setting information according to the output analysis result (see S402) by referring to a list (not shown) stored in the auxiliary storage unit 312. The list stores the analysis result and the setting information in association with each other. For example, in the case of analysis results indicating news content, the bass range is not emphasized by stopping the woofer 6 and the bass enhancer function, the human voice frequency band is emphasized by the clear voice function, and the auto volume function is activated. It becomes the setting to be made. Also, in the case of analysis results showing movie content, the bass volume is emphasized by activating the woofer 6 and the bus enhancer function, and only the human voice is not emphasized by disabling the clear voice function. It is set to stop.

  As described above, according to the present invention, it is possible to perform reliable analysis using any of the parameters by sequentially analyzing the content using a plurality of parameters. Also, by setting the setting information in a multifaceted manner according to the results of analysis using a plurality of parameters, the optimum audio environment is automatically set in more detail than when using the user preference or the number of audio channels specified on the broadcasting station side. be able to.

Embodiment 2. FIG.
In addition to the first embodiment described above, an optimal audio environment may be set by analyzing the number of audio channels of the received audio signal or determining a no-signal state where no signal is input. Therefore, this embodiment will be described below as a second embodiment.

  The audio processing unit 309 includes means for analyzing the number of audio channels included in the audio signal, in addition to each unit in the first embodiment (see FIG. 9). Further, the CPU 300 determines a no-signal state in which the video signal and the audio signal are not received for a predetermined time or more.

  The other hardware is the same as that described in the first embodiment, so the same reference numerals are given and description thereof is omitted.

  FIG. 14 is a flowchart showing the procedure of the audio change process executed by the video / audio output device 3 according to the second embodiment. The CPU 300 of the video / audio output device 3 receives a video signal and an audio signal via the input IF 301, the video switch 302, the audio switch 303, or the HDMI 304 (S501).

  The CPU 300 executes content analysis processing for analyzing the content indicated by the received video signal or audio signal (S502). The CPU 300 executes an audio channel number analysis process for analyzing the number of audio channels included in the received audio signal (S503). For example, the CPU 300 is set to operate the woofer 6 when receiving audio signals of 2.1 channels, 5.1 channels, or 7.1 channels, and receives audio signals of other channels. In such a case, the power supply to the woofer 6 is set to be stopped.

  The CPU 300 executes a no-signal state determination process for determining whether or not there is a no-signal state (S504). For example, when it is determined that there is no signal, the CPU 300 sets the power supply to the woofer 6 to be stopped.

  The CPU 300 determines setting information corresponding to the analysis result (S505), and changes the frequency characteristics of the audio signal according to the determined setting information (S506). Further, the CPU 300 changes the volume according to the determined setting information (S507), and controls the power supply to the woofer 6 (S508). The CPU 300 ends the process.

  Note that the procedure of the content analysis process executed in step S502 is the same as that in the flowchart shown in FIG. 12, and therefore the same step number is assigned and description thereof is omitted.

  As described above, according to the present invention, when a predetermined number of channels are received or when it is determined that there is no signal, power consumption to the woofer 6 is stopped to save unnecessary power consumption. Can do. For example, when the television receiver is a 37-inch type, the power consumption is 200 to 250 watts. When the power supply to the woofer 6 is stopped, the power consumption of about 15 watts can be suppressed.

  In the above-described embodiment, the video / audio output device 3 and the television receiver including the video / audio output device 3 have been described as examples. However, the present invention is not limited to this, and the video / audio output device 3 such as a DVD player or a video deck may exist alone.

It is a block diagram which shows the structure of the television receiver which concerns on this invention, and a video / audio output device. It is a conceptual diagram which shows an example of the stack | stuck of a digital signal. It is a block diagram which shows the structure of a video processing part. It is a schematic diagram for demonstrating the type of image | video. It is a schematic diagram which shows an example of the character displayed on the image | video which a video signal shows. It is a flowchart which shows the procedure of a character recognition process. It is a flowchart which shows the procedure of a motion vector discrimination | determination process. It is a graph explaining an example of the luminance distribution of an image | video. It is a block diagram which shows the structure of an audio | voice processing part. It is a graph explaining an example of frequency distribution of sound. 4 is a flowchart illustrating a procedure of audio change processing executed by the video / audio output device according to Embodiment 1; It is a flowchart which shows the procedure of the content analysis process which a video / audio output device performs. It is a flowchart which shows the procedure of the content analysis process which a video / audio output device performs. 10 is a flowchart illustrating a procedure of audio change processing executed by the video / audio output device according to the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reception part 10 Antenna 2 Tuner 3 Video / audio output device 300 CPU
301 Input IF
302 Video switch 303 Audio switch 304 HDMI
305 HDMI selector 306 HDMI receiver 307 Video processing unit 3070 Black band discrimination unit 3071 Character recognition unit 3072 WSS detection unit 3073 Motion vector discrimination unit 3074 Histogram detection unit 308 Video output IF
309 Audio processing unit 3090 Audio multiplexing determination unit 3091 Frequency distribution detection unit 3092 Commercial determination unit 310a amplifier 310b amplifier 311a audio output IF
311b Audio output IF
312 Auxiliary storage unit 313 Power supply unit 4 Display 5 Speaker 6 Woofer

Claims (15)

Input means for receiving a video signal and an audio signal synchronized with the video, correction means for changing the frequency characteristics and / or volume of the received audio signal, audio based on the changed frequency characteristics and / or volume, and the video signal An audio / video output device comprising output means for outputting a video based on
Analyzing means for analyzing the content indicated by the video signal and the audio signal;
Determining means for determining the frequency information of the audio signal corresponding to the analysis result and setting information indicating the volume;
The video / audio output apparatus, wherein the correcting means changes the frequency characteristic and / or volume of the audio signal in accordance with the determined setting information. When the video signal or audio signal is a digital signal including additional information indicating the type of content,
The analysis means analyzes the type of content indicated by the additional information,
The video / audio output apparatus according to claim 1, wherein the determining means determines setting information corresponding to the analyzed content type. When the video signal or audio signal is not a digital signal including the additional information,
The analyzing means determines whether the video signal includes a first signal for outputting a letterbox type video,
3. The determination unit according to claim 1, wherein the determination unit determines setting information corresponding to a letterbox type image when the analysis unit determines that the video signal includes a first signal. The audio / video output device described in 1. When the video signal or audio signal is not a digital signal including the additional information,
The analyzing means determines whether or not the audio signal includes a second signal that outputs a bilingual broadcast audio;
4. The determination unit according to claim 1, wherein the determination unit determines setting information corresponding to a bilingual broadcast when the analysis unit determines that the audio signal includes a second signal. The video / audio output device according to any one of the above. When the video signal or audio signal is not a digital signal including the additional information,
The analyzing means determines whether or not the video signal includes a third signal for outputting a teletext video;
5. The determination unit according to claim 1, wherein the determination unit determines setting information corresponding to a text broadcast when the analysis unit determines that the video signal includes a third signal. Or the audio / video output device according to claim 1. The analysis means includes
When it is determined that the video signal includes the third signal, the character data to be output by text broadcasting is detected, and
And a judging means for judging whether or not the detected character data includes a word in a predetermined expression format,
The determining unit determines setting information corresponding to a character broadcast including a word in a predetermined expression format when the determining unit determines that the detected character data includes a word in a predetermined expression format. The video / audio output apparatus according to claim 5, wherein the video / audio output apparatus is provided. When the video signal or audio signal is not a digital signal including the additional information,
The analyzing means determines whether or not the video signal includes a fourth signal designating a predetermined aspect ratio;
2. The determination unit according to claim 1, wherein the determination unit determines setting information corresponding to the predetermined aspect ratio when the analysis unit determines that the video signal includes a fourth signal. 6. The video / audio output device according to claim 6. When the video signal or audio signal is not a digital signal including the additional information,
The analysis means analyzes a motion vector between frames of the video indicated by the video signal,
8. The video / audio output apparatus according to claim 1, wherein the determining unit determines setting information corresponding to a motion vector between analyzed frames. When the video signal or audio signal is not a digital signal including the additional information,
The analysis means analyzes the frequency distribution of the voice indicated by the voice signal,
9. The video / audio output apparatus according to claim 1, wherein the determining unit determines setting information corresponding to the analyzed frequency distribution of the audio. When the video signal or audio signal is not a digital signal including the additional information,
The analysis means detects a state in which the audio signal is switched from a bilingual broadcast to a stereo broadcast,
10. The video / audio according to claim 1, wherein, when the analyzing unit detects the state, the determining unit determines setting information corresponding to the state. 11. Output device. When the video signal or audio signal is not a digital signal including the additional information,
The analysis means analyzes the luminance distribution of the video indicated by the video signal,
11. The video / audio output apparatus according to claim 1, wherein the determining unit determines setting information corresponding to a luminance distribution of the analyzed video. The video / audio output device according to any one of claims 1 to 11,
The output means includes a bass output unit for outputting a bass range of voice,
A video / audio output apparatus, further comprising control means for stopping power supply to the bass output unit in accordance with the determined setting information. The analyzing means determines whether the audio signal includes a fifth signal indicating a predetermined number of audio channels;
The determining means determines setting information corresponding to a sound to be output with the predetermined number of sound channels when the analyzing means determines that the sound signal includes a fifth signal;
The video / audio output apparatus according to claim 12, wherein the control unit is configured to stop power supply to the bass output unit in accordance with the determined setting information. A determination means for determining whether or not the input means is in a no-signal state where no video signal or audio signal is received;
14. The control unit according to claim 12 or 13, wherein when the determination unit determines that the input unit is in a no-signal state, power supply to the bass output unit is stopped. Video / audio output device. The video / audio output device according to any one of claims 1 to 14,
A television receiver comprising: a tuner that generates a video signal and an audio signal from radio waves received by an antenna and outputs the signal to the input means.

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