JP2010136294A - Video/audio output device and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video/audio output device and computer program capable of changing processing to an audio signal synchronized to a video signal without generating click noise. <P>SOLUTION: A video/audio signal is input to an input section 11, processed by a video processing section 13 and output from a video output section 14. A delay time corresponding to the processing of the video processing section 13 is read from a delay time table 251 and set to a delay section 15, and an audio signal is delayed by the delay section 15 so as to be synchronized to a video signal delayed by the video processing section 13. The delayed audio signal is modified on the basis of setting information set by an audio processing section 16, and output from audio output sections 17a, 17b. When modifying the setting information set to the audio processing section 16, a modification time corresponding to the setting information modified is read out and if the lapse of time of a silent signal included in the audio signal is longer than the modification time and the delay time is longer than the modification time, the setting information is modified. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a video / audio output device and a computer program that can change processing on an audio signal synchronized with the video signal.

  A video / audio output device such as a television receiver that receives a video signal and an audio signal synchronized with the video signal, processes the video signal, and outputs the video signal together with the display unit and the speaker is widely used. Such a video / audio output device includes a DSP (Digital Signal Processor) for high-speed digital signal processing of a video signal input to display a video suitable for viewing. The video signal processed by the DSP is delayed by the processing time of the digital signal processing by the DSP. Therefore, these video / audio output devices output the audio signal with a delay in order to synchronize with the delayed video signal.

  2. Description of the Related Art In recent years, a video / audio output device including a DSP for digital signal processing of an audio signal and changing frequency characteristics, volume, and the like to emit sound suitable for viewing has been used. Such a video / audio output device has a plurality of audio functions corresponding to each of a plurality of types of processing for audio signals, and can switch setting information relating to ON / OFF of each audio function and processing of each audio function. It is. The voice function is a human voice enhancement function that performs a process of changing frequency characteristics so as to emphasize a human voice such as an announcer for a voice signal related to a news program, for example, so as to emphasize a bass tone for a voice signal related to music or a movie. There are a bass emphasis function for performing a process of changing frequency characteristics, an automatic volume adjustment function for performing a process of adjusting the volume of the audio signal so as to suppress a sudden change in the volume of the input audio signal, and the like.

Patent Document 1 describes a video / audio output device that automatically sets on / off switching of a sound function so as to change to sound suitable for a user's preference based on a user's operation history. In such a video / audio output device, it is known that when the audio function is switched from off to on, the output audio signal changes greatly, and a vowel sound is generated in the audio of the audio signal. When changing the sound field mode of an amplifier having a plurality of output channels, the video / audio output device described in Patent Document 2 shifts the timing for switching some output channels from the timing for switching other output channels. This suppresses the generation of a clicking sound in the sound of the output audio signal.
JP 2000-196790 A JP 2008-78879 A

  However, the video / audio output device described in Patent Document 2 suppresses the generation of a clicking sound when the sound field mode is changed, and does not prevent the generation of a clicking sound when the processing on the audio signal is changed. It was.

  The present invention has been made in view of such circumstances, and the delay time of the delayed audio signal is longer than the silence period of the input audio signal, and the delay time is a change required for changing the processing on the audio signal. By providing a change means for changing the processing after the time point when it is determined that the time is longer than the time, the change of the processing is completed within the silence period of the input audio signal, and a sound is generated in the sound of the output audio signal. It is an object of the present invention to provide a video / audio output device and a computer program that prevent this.

  An audio / video output apparatus according to the present invention includes an input unit that receives an image signal and an audio signal synchronized with the image signal, an image processing unit that processes the received image signal according to an image to be displayed, and the audio signal. A delay means for delaying and synchronizing with the video signal processed by the video processing means, and outputting the processed video signal and an audio signal synchronized with the video signal based on setting information A voice processing means for processing a voice signal received by the input means; a changing means for changing the setting information to different setting information; and a change time required for the voice processing means to change the process according to the change by the changing means. Acquisition means for acquiring the sound, detection means for detecting a silence signal included in the audio signal received by the input means, and a period when the detection means detects the silence signal. Time measuring means for measuring the elapsed time from the point in time when the silence signal is detected, and first determination means for determining whether or not the elapsed time measured by the time measuring means is longer than the change time acquired by the acquisition means; Second determining means for determining whether or not the delay time delayed by the delay means is longer than the change time acquired by the acquiring means, wherein the changing means is configured to detect the elapsed time by the first determining means. Is determined to be longer than the change time, and when the second determination means determines that the delay time is longer than the change time, the setting information is changed to the different setting information. To do.

  In the present invention, a video signal and an audio signal synchronized with the video signal are input. Processing such as digital signal processing is performed so that the input video signal displays a video suitable for viewing by the user. The audio signal is subjected to processing by digital signal processing or the like based on setting information set in advance to emit sound suitable for user viewing. Since the processing time for the video signal is usually longer than the processing time for the audio signal, the audio signal is delayed in order to synchronize with the video signal delayed by the processing. When changing the setting information related to the processing of the audio signal to different setting information, the silence period of the input audio signal is longer and delayed than the change time required to change the processing for the audio signal according to the change of the setting information When it is determined that the delay time of the audio signal is longer than the change time, the setting information is changed to different setting information. As a result, since the process is changed within the silent period of the output audio signal, no vowel sound is generated in the audio of the output audio signal.

  An audio / video output apparatus according to the present invention includes an input unit that receives an image signal and an audio signal synchronized with the image signal, an image processing unit that processes the received image signal according to an image to be displayed, and the audio signal. A delay means for delaying and synchronizing with the video signal processed by the video processing means, and outputting the processed video signal and an audio signal synchronized with the video signal based on setting information A voice processing means for processing a voice signal received by the input means; a changing means for changing the setting information to different setting information; and a change time required for the voice processing means to change the process according to the change by the changing means. Acquisition means for acquiring the sound, detection means for detecting a silence signal included in the audio signal received by the input means, and a period when the detection means detects the silence signal. A time measuring means for measuring an elapsed time from the point in time when the silence signal is detected, and determining whether or not the elapsed time measured by the time measuring means is longer than a delay time of the audio signal delayed by the delay means. 1 determination means, and second determination means for determining whether or not the delay time is longer than the change time acquired by the acquisition means, wherein the change means determines the elapsed time by the first determination means. It is configured to change to the different setting information after a time point when it is determined that the delay time is longer than the change time and the second determination means determines that the delay time is longer than the change time. .

  In the present invention, when the setting information related to the processing of the audio signal is changed to different setting information, the delay time of the delayed audio signal is longer than the silence period of the input audio signal and the delay time is set. In response to the change of information, it waits until it is determined that it is longer than the change time required for the change of the process for the audio signal, and is changed to different setting information after that time. As a result, since the start to completion of the process change is performed within the silence period, no sound is generated in the sound of the output sound signal.

  The video / audio output device according to the present invention includes storage means for storing a plurality of pieces of setting information in association with a plurality of change times, and the change means includes a plurality of setting information stored in the storage means. The setting unit is configured to change to the selected setting information, and the acquisition unit is configured to read the change time stored in the storage unit in association with the setting information selected by the changing unit. To do.

  In the present invention, the change time required to change the process for the audio signal is obtained in advance for each of the plurality of setting information, and is stored in the storage unit in association with each setting information of the change destination. When changing to a single setting information selected from a plurality of setting information stored in the storage unit, the changing means reads the change time stored in association with the setting information of the change destination.

  In the video / audio output device according to the present invention, the video signal includes additional information indicating a type of video content, and the changing unit is configured to change the setting information according to the additional information. It is characterized by that.

  In the present invention, the setting information is changed to obtain an audio signal suitable for listening based on the type of video content indicated by the additional information included in the video signal. For example, when the content type of the video is a news program, it is changed to setting information for emphasizing the human voice frequency band, and an audio signal that allows the user to easily hear the human voice is output.

  The video / audio output device according to the present invention is characterized in that the audio processing means is configured to perform a process of changing a frequency characteristic and / or volume of the audio signal.

  In the present invention, the frequency characteristic and / or volume of the audio signal is changed. For example, if the content type of the video is a broadcast program such as a drama, and the volume of the audio signal that is input after the video related to the advertisement program is inserted in the middle, the volume of the output audio signal does not increase abruptly Thus, the audio signal is processed.

  The video / audio output device according to the present invention includes an off means for turning off driving of the speaker for emitting the low frequency component when the audio processing means is changed to remove the low frequency component of the audio signal. It is characterized by that.

  In the present invention, when the audio processing means performs processing so as to remove the low-frequency component of the audio signal, the driving power of the speaker such as a woofer that emits a low-frequency sound connected to the outside of the audio / video output device is turned off. .

  A computer program according to the present invention delays an audio signal processed based on setting information, and changes the setting information to different setting information in a computer included in a video / audio output device that outputs the audio signal in synchronization with the video signal. In the computer program to be executed, the computer causes the computer to determine whether a silent period included in the audio signal is longer than a change time required to change the process on the audio signal according to the change to the different setting information. 1 determination step, a second determination step of determining whether or not a delay time of delaying the audio signal based on the setting information is longer than the change time, and the silence period is changed by the first determination step. It is determined that the time is longer than the time, and the delay time is longer than the change time by the second determination step. If it is determined that, characterized in that to execute a changing step of changing to said different configuration information.

  In the present invention, when the setting information related to the processing of the audio signal is changed to different setting information, the delay time of the delayed audio signal is longer than the silence period of the input audio signal and the delay time is set. In response to the change of information, it waits until it is determined that it is longer than the change time required for the change of the process for the audio signal, and is changed to different setting information after that time. As a result, since the start to completion of the process change is performed within the silence period, no sound is generated in the sound of the output sound signal.

  In the present invention, it is determined that the delay time of the delayed audio signal is longer than the silence period of the input audio signal, and that the delay time is longer than the change time required to change the processing on the audio signal By providing the changing means for changing the process thereafter, the change of the process is completed within the silence period of the input audio signal, and the sound of the audio signal to be output is prevented from being generated.

Embodiment 1
Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram illustrating an internal configuration example of the video / audio output device according to the first embodiment. The video / audio output apparatus of the present invention is a video / audio signal obtained by receiving a broadcast wave such as terrestrial digital television broadcast, or a DVD (Digital Versatile Disc) player and BD (Blu-ray Disc, registered trademark) connected to the outside. ) A television receiver that displays and emits video and audio of a video and audio signal that is reproduced by a recorder, a home theater system that outputs video and audio of a video and audio signal that is reproduced by a DVD player, etc. from a display device and a speaker, or these And a DSP that processes and outputs an input video / audio signal. In the first embodiment, a video / audio signal input from a tuner that receives a broadcast wave or a video / audio signal from a player that reproduces a recorded video / audio signal is processed so as to be a video and audio suitable for viewing. A video / audio output device composed of a display device and a DSP that outputs to a speaker will be described as an example.

  In the figure, reference numeral 1 denotes a video / audio output device which processes a video / audio signal input to an input unit (input means) 11 and outputs it to a display device 3 connected to the outside, and a speaker 4a and a woofer 4b. By doing so, an image is displayed on the display device 3, and sound is emitted from the speaker 4a and the woofer 4b. A video / audio signal is input to the input unit 11 from a tuner and a player (not shown) connected to the outside. The video / audio signal includes a video signal, an audio signal synchronized with the video signal, and additional information indicating the type of content (video content).

  The video / audio output device 1 includes a separation unit 12 that separates a video signal, an audio signal, and additional information from a video / audio signal input to the input unit 11, and a video processing unit that processes the video signal separated by the separation unit 12 ( Video processing means) 13 and a video output unit 14 for outputting the video signal processed by the video processing unit 13 to the external display device 3. In addition, the delay unit 15 that delays the audio signal separated by the separation unit 12, and the audio that processes the audio signal delayed by the delay unit 15 based on the setting information and outputs the audio signal and the low frequency component of the audio signal A processing unit (audio processing means) 16 and audio output units 17a and 17b for outputting the audio signal output from the audio processing unit 16 and the low frequency components of the audio signal to the external speaker 4a and the woofer 4b are provided. Each of the external speaker 4a and the woofer 4b includes an amplifier unit (not shown), and amplifies each of the input audio signals to emit sound.

  Also, the video / audio output device 1 determines the content type of the video / audio signal based on the signal strength of the audio signal separated by the separation unit 12, that is, the volume detection unit 18 that detects the volume, and the additional information separated by the separation unit 12. A type discriminating unit 19 for discriminating and an operation receiving unit 21 for accepting an operation from a user are provided. Furthermore, the video / audio output device 1 includes a CPU (Central Processing Unit) 20 that controls each part of the hardware of the video / audio output device 1 via a bus 20a, and a ROM (Read-Only) that stores a computer program executed by the CPU 20. Memory) 22, RAM (Random-Access Memory) 23 for storing variables and the like generated during the execution of the computer program, and the elapsed time (silence period) from when the silence signal included in the input audio signal is detected ), And a storage unit (storage means) 25 that stores various setting tables and time tables.

  The storage unit 25 includes a delay time table 251 including delay times to be set in the delay unit 15 corresponding to each processing of the video signal performed by the video processing unit 13, and audio according to the content type determined by the type determination unit 19. When the audio setting table 252 including the setting information to be set in the processing unit 16 and the setting information set in the audio processing unit 16 are changed, the audio processing unit 16 changes the process according to the changed setting information. A change time table 253 consisting of change times required to complete the process is stored. When changing the setting information set in the voice processing unit 16, the CPU 20 functions as an acquisition unit that acquires the change time by reading the change time corresponding to the setting information of the change destination from the change time table 253.

  FIG. 2 is a block diagram illustrating configurations of the video processing unit 13 and the audio processing unit 16 according to the first embodiment. In the figure, (a) shows a video processing unit and (b) shows an audio processing unit. When the video signal is an interlace signal, the video processing unit 13 calculates a prediction error from the IP conversion unit 131 that converts to a progressive signal and motion information of the video signal, and corrects the video signal based on the prediction error. And a motion prediction correction unit 132. The audio processing unit 16 includes a volume changing unit 161 for changing the signal intensity of the audio signal, that is, a volume, a frequency characteristic changing unit 162 for changing the frequency characteristic, and a woofer 4b that emits a low frequency component of the audio signal. And a woofer power source switching unit 163 (off means) for switching on / off of the power source (woofer power source).

  When the sound volume detected by the sound volume detection unit 18 is lower than a predetermined threshold, the CPU 20 also functions as a silence signal detection unit together with the sound volume detection unit by detecting it as a silence signal. Further, when the CPU 20 and the time measuring unit 24 detect a silence signal, the time measuring unit 24 starts to measure the elapsed time, so that the CPU 20 and the time measuring unit 24 can also measure time elapsed from the time when the silence signal is detected (silence period). Function. In addition, the CPU 20 reads the setting information corresponding to the content type determined by the type determination unit 19 from the audio setting table 252 and changes the setting information set in the audio processing unit 16 at a timing described later. Functions as a means. In addition, when the operation receiving unit 21 receives an operation for changing the setting information set in the audio processing unit 16, the CPU 20 changes the setting information immediately.

  FIG. 3 is a chart showing a record layout example of the delay time table 251 according to the first embodiment. In the example of the delay time table 251 illustrated in FIG. 3, a delay time of 114 msec is stored corresponding to the case where the IP conversion unit 131 of the video processing unit 13 is turned on. The delay time 114 msec corresponds to the processing time required for IP conversion performed when the IP conversion unit 131 is turned on when a video signal including an interlace signal is input to the video processing unit 13. That is, it indicates that the audio signal should be delayed by 114 msec so as to synchronize with the video signal delayed by the IP conversion. Further, a delay time of 198 msec is stored corresponding to the case where the motion prediction correction unit 132 of the video processing unit 13 is turned on.

  The delay time 198 msec corresponds to the processing time required for motion prediction correction executed when the motion prediction correction unit 132 is turned on when a video signal capable of acquiring a motion vector is input to the video processing unit 13. Yes. That is, it indicates that the audio signal should be delayed by 198 msec so as to synchronize with the video signal delayed by the motion prediction correction. Further, a delay time of 23 msec is stored corresponding to the normal process, which is another process that the video processing unit 13 is always executing on the video signal. The delay time 23 msec corresponds to the processing time required for normal processing that is always turned on and executed. That is, it indicates that the audio signal should be delayed by 23 msec so as to synchronize with the video signal delayed by the normal processing.

  FIG. 4 is a chart showing a record layout example of the audio setting table 252 according to the first embodiment. In the example of the audio setting table 252 illustrated in FIG. 4, setting information set in the audio processing unit 16 is stored in association with each content type determined by the type determining unit 19. In the example illustrated in FIG. 4, the setting information includes a voice enhancement function, a volume automatic adjustment function, a bass enhancement function, and an on / off setting for each of the woofer power supplies. The human voice enhancement function is a function of changing the frequency characteristic of the voice signal by the frequency characteristic changing unit 162 so that the signal intensity of the frequency band corresponding to the human voice is larger than the signal intensity of the other frequency band. The automatic volume adjustment function is a function of changing the volume of the audio signal by the volume changing unit 161 so as to suppress the fluctuation when the volume detected by the volume detecting unit 18 changes rapidly.

  The bass enhancement function is a function of changing the frequency characteristic of the audio signal by the frequency characteristic changing unit 162 so that the signal intensity in the frequency band corresponding to the bass component is larger than the signal intensity in the other frequency band. On / off of the woofer power supply indicates switching of the power supply (woofer power supply) of the woofer 4b by the woofer power supply switching unit 163. In the example shown in FIG. 4, the voice emphasis function and the automatic voice adjustment function are turned on, and the bass emphasis function and the woofer power supply are turned off by setting information stored in association with the content types “news” and “information”. It is specified to do. Thus, the frequency characteristic changing unit 162 changes the frequency characteristic of the voice signal so that the user can easily hear the voice of an announcer or narration included in the voice signal related to news.

  In addition, when a high volume advertising program is inserted in the middle of a news program whose volume is substantially constant, the volume of the output audio signal increases rapidly and does not cause discomfort to the user who is listening. The volume changing unit 161 adjusts the volume automatically. In addition, power consumption is reduced by turning off the bass emphasis function and the woofer power source for a news program that does not need to output a bass range. In the example shown in FIG. 4, the voice emphasis function and the automatic voice adjustment function are turned off, and the bass emphasis function and the woofer power source are turned on based on the voice setting information stored in association with the content types “movie” and “music”. It is specified to be. As a result, the frequency characteristic changing unit 162 changes the frequency characteristic of the audio signal so as to enhance the low frequency range of the audio signal related to video and music so that the user can perform powerful listening. In addition, the woofer power supply is turned on to output the bass component of the audio signal.

  FIG. 5 is a chart showing a record layout example of the change time table 253 according to the first embodiment. In the example of the change time table 253 shown in FIG. 5, change times of 1 msec, 3 msec, 1 msec, and 200 msec are stored in association with the human voice enhancement function, the automatic volume adjustment function, the bass enhancement function, and the woofer power supply, respectively. The change time is from the time when each sound function or the woofer power supply is switched on / off to the sound processing unit 16 until the sound signal processed by the on / off state after switching is output from the sound processing unit 16. The time required for the process, that is, the time required for changing the process is shown. The change time may be obtained experimentally and stored in advance. Further, when the audio processing unit 16 is configured to perform digital signal processing on an audio signal input in accordance with pre-programmed firmware, the change time is obtained and stored based on the execution time of each instruction constituting the firmware. You may keep it.

  In the example shown in FIG. 5, when the human voice enhancement function is switched from the off state to the on state, the voice signal output from the voice processing unit 16 is changed to a voice signal in which the voice is emphasized after 1 msec from the time of switching. Which indicates that. In addition, when the woofer power source is switched from the on state to the off state, it goes through a transient state from the on state to the off state, and then turns off after 200 msec. Next, an operation in which the audio / video output apparatus 1 sets the delay time of the audio signal will be described.

  FIG. 6 is a timing chart showing the relationship among an input video signal, an output video signal, an input audio signal, and a delayed audio signal according to the first embodiment. In the figure, (a) shows an input video signal input to the video processing unit 13, and a time point T0 indicates a time point when the input of the video signal to the video processing unit 13 is started. (B) in the figure shows an output video signal output from the video processing unit 13, and (c) and (d) in the figure indicate an input audio signal input to the audio processing unit 16 and a delay unit, respectively. A delayed audio signal delayed by 15 is shown. As shown in FIG. 6, the output video signal starts to be output from time T1 when the delay time ΔTd has elapsed by the processing of the video processing unit 13 with respect to time T0.

  The CPU 20 of the video processing device 1 reads the delay time corresponding to video processing such as IP conversion and motion prediction correction for which the video processing unit 13 is on from the delay time table 251, calculates the total value, and sets the delay time ΔTd. get. For example, when a video signal that is an interlaced signal and for which a motion prediction vector cannot be obtained is input, the delay time 114 msec associated with IP conversion and the delay time 23 msec associated with normal processing are the delay time table. The total value 137 msec read from 251 is set in the delay unit 15 as the delay time ΔTd. Next, a procedure for determining a change timing when the setting information set in the audio processing unit 16 is changed according to the content type by the video / audio output apparatus 1 will be described.

  FIG. 7 is a timing chart showing the relationship between the input audio signal and the delayed audio signal for explaining the timing of changing the setting information according to the first embodiment. When the setting information set in the audio processing unit 16 is changed to different setting information according to the content type determined by the type determination unit 19, the CPU 20 of the video / audio output apparatus 1 has a delay set in the delay unit 15. The change time ΔTc stored in the change time table 253 is read in association with the time ΔTd and the change destination function. The video / audio output device 1 waits until a silence signal is detected from the input audio signal. When the silence signal is detected, the video / audio output apparatus 1 measures the elapsed time ΔTs from the time when the silence signal is detected by the timer unit 24. Start and continue timing while the silence signal is detected. In the example shown in FIG. 7A, a silence signal is detected from the input voice signal at time T2, and the elapsed time ΔTs is started.

  The CPU 20 determines whether or not the elapsed time ΔTs timed by the timer unit 24 is longer than the change time ΔTc (first determination means), and waits until it is determined that the elapsed time ΔTs is longer than the change time ΔTc. To do. When the elapsed time ΔTs is longer than the change time ΔTc as shown in FIG. 7B, the setting information is changed within the silence period from the time T3 when the delayed audio signal becomes a silence signal to the time T6 when the elapsed time ΔTs elapses. It becomes possible to do. Further, the CPU 20 determines whether or not the delay time ΔTd is longer than the change time ΔTc (second determination means). If the CPU 20 determines that the delay time ΔTd is longer than the change time ΔTc, the CPU 20 determines that the setting information is to be changed, and sets the change destination setting information in the audio processing unit 16 to start changing the audio signal.

  In the example shown in FIG. 7, it is determined that the delay time ΔTd is longer than the change time ΔTc at time T4, and the change destination setting information is set in the audio processing unit 16 at time T4. In this case, the setting information of the change destination is set when the delayed audio signal becomes a silence signal, and the change of the process having the change time Tc from the time T3 to the time T6 within the silence period of the delayed audio signal is completed. To do. Thereby, since the process change based on the different setting information is executed within the silent period, the audible sound is not generated in the delayed audio signal. Accordingly, the sound processing unit 16 is input to the sound processing unit 16. Next, another example of the procedure for determining the change timing will be described.

  The CPU 20 determines whether or not the elapsed time ΔTs measured by the time measuring unit 24 is longer than the delay time ΔTd set in the delay unit 15 (first determination unit), and the elapsed time ΔTs is greater than the delay time ΔTd. Wait until it is determined to be too long. As shown in FIG. 7B, at the time T3 when the delayed audio signal becomes a silence signal, the delayed audio signal is delayed by a delay time ΔTd from the time T2, and after the time T3, the delayed audio signal is a silence signal. Within the period. The CPU 20 determines whether or not the delay time ΔTd is longer than the change time ΔTc (second determination means). The CPU 20 determines the time point when the delay time ΔTd is determined to be longer than the change time ΔTc as the timing for changing the setting information, and sets the change destination setting information in the audio processing unit 16 to start changing the audio signal.

  In the example shown in FIG. 7, it is determined that the delay time ΔTd is longer than the change time ΔTc at time T4, and the change destination setting information is set in the audio processing unit 16 at time T4. In this case, the setting information of the change destination is set, and the sound processing unit 16 changes the processing based on the newly set setting information from time T3 to time T6 within the silence period of the delayed sound signal. The change of the process having time Tc is completed. Thereby, since the change of the process based on different setting information is started and completed within the silent period, no audible sound is generated in the delayed audio signal. Therefore, it is input to the audio processing unit 16.

  For example, when the delay time ΔTd set in the delay unit 15 is 137 msec and the setting information of the sound processing unit 16 is changed, the process waits until the elapsed time ΔTs from the time when the silence signal is detected exceeds 137 msec. When the change of the setting information is switching the voice emphasis function from the off state to the on state, 1 msec is read as the change time ΔTc corresponding to the human voice emphasis function in the example shown in FIG. Since the delay time ΔTd (137 msec) is longer than the change time ΔTc (1 msec), when the elapsed time ΔTs exceeds 137 msec, the human voice enhancement function starts to be switched from the off state to the on state.

  For example, when the change of the setting information is switching from the ON state of the woofer power supply to the OFF state, 200 msec is read as the change time ΔTc corresponding to the woofer power supply. In this case, since the delay time ΔTd (137 msec) is shorter than the change time Tc (200 msec) and the elapsed time ΔTs exceeds 137 msec, the switching of the woofer power supply is not completed within the silence period of the delayed audio signal. The switching from the on state to the off state is not started.

  FIG. 8 is a flowchart showing a procedure of delay time setting processing according to the first embodiment. The delay time setting process is executed by the CPU 20 when a video signal is input to the video processing unit 13. The CPU 20 reads the delay time corresponding to the turned-on video processing from the IP time conversion function and motion prediction correction by the video processing unit 13 from the delay time table 251 (step S11). The CPU 20 reads out the delay time corresponding to the normal processing by the video processing unit 13 from the delay time table 251 (step S12). The CPU 20 calculates the total of the read delay times (step S13), and sets the delay time ΔTd consisting of the total value in the delay unit 15 (step S14).

  The CPU 20 determines whether or not a video signal is input to the input unit 11 (step S15). If the CPU 20 determines that a video signal has been input (YES in step S15), the CPU 20 returns the process to step S11 for reading the delay time corresponding to the turned-on video processing. If the CPU 20 determines that no video signal has been input (NO in step S15), the delay time setting process ends.

  FIG. 9 is a flowchart showing a procedure of silent period timing processing according to the first embodiment. The timekeeping process is executed by the CPU 20 when an audio signal is input to the volume detection unit 18. CPU20 acquires the sound volume which the sound volume detection part 18 detected (step S21). CPU20 determines whether the acquired sound volume is less than a predetermined value (step S22). When the CPU 20 determines that the volume is less than the predetermined value (YES in step S22), the CPU 20 determines whether or not the time measuring unit 24 is measuring time (step S23). When determining that the time measuring unit 24 is not measuring time (NO in step S23), the CPU 20 causes the time measuring unit 24 to start measuring time (step S24).

  CPU20 determines whether the audio | voice signal is input into the sound volume detection part 18 (step S25). If the CPU 20 determines that an audio signal has been input (YES in step S25), the CPU 20 returns the process to step S21 for acquiring the volume detected by the volume detector 18. If the CPU 20 determines that no audio signal is input (NO in step S25), it ends the silent period timing process. If the CPU 20 determines in step S23 whether or not the timing unit 24 is timing (YES in step S23), an audio signal is input to the volume detection unit 18. The process is shifted to step S25 for determining whether or not it is. If the CPU 20 determines in step S22 whether or not the acquired volume is less than a predetermined value (NO in step S22), whether or not the time measuring unit 24 is measuring time is determined. Is determined (step S26).

  If the CPU 20 determines that the time measuring unit 24 is measuring time (YES in step S26), the CPU 20 causes the time measuring unit 24 to stop measuring time (step S27). The CPU 20 clears the time measured by the time measuring unit 24 (step S28), and returns the process to step S21 for acquiring the sound volume detected by the sound volume detecting unit 18. If the CPU 20 determines in step S26 whether or not the time measuring unit 24 is measuring time (NO in step S26), the process proceeds to step S21 for acquiring the sound volume detected by the sound volume detecting unit 18. To return.

  FIG. 10 is a flowchart showing the procedure of the voice switching process according to the first embodiment. The audio switching process is executed by the CPU 20 when a video signal is input to the type determination unit 19. The CPU 20 acquires the content type determined by the type determination unit 19 (step S41). The CPU 20 reads the setting information corresponding to the content type from the audio setting table 252 (step S42), and acquires the setting information set in the audio processing unit 16 (step S43). The CPU 20 determines whether or not the setting information read from the sound setting table 252 is setting information different from the setting information set in the sound processing unit 16 (step S44). If the CPU 20 determines that the audio setting information is not different (NO in step S44), the process returns to step S41 for acquiring the content type.

  If the CPU 20 determines that the setting information is different (YES in step S44), the CPU 20 executes a sound change process described later (step S45). The CPU 20 determines whether or not a video signal is input to the type determination unit 19 (step S46). When it is determined that a video signal is input (YES in step S46), the CPU 20 acquires a content type (step S41). Return processing to. If the CPU 20 determines that no video signal is input (NO in step S46), the audio switching process ends.

  FIG. 11 is a flowchart showing the procedure of the voice change process according to the first embodiment. CPU20 acquires delay time (DELTA) Td set to the delay part 15 (step S51). The CPU 20 determines whether or not the time measuring unit 24 is measuring time (step S52). If it is determined that the time is not being measured (NO in step S52), the process returns to step S51 for acquiring the delay time. If the CPU 20 determines that the time is being measured (YES in step S52), the CPU 20 obtains the elapsed time ΔTs that is timed by the time measuring unit 24 (step S53), and corresponds to the setting information of the change destination from the change time table 253. The change time ΔTc is read (step S54). The CPU 20 determines whether or not the elapsed time ΔTs is longer than the delay time ΔTd (step S55). When determining that the elapsed time ΔTs is longer than the delay time ΔTd (YES in step S55), the CPU 20 determines whether the delay time ΔTd is longer than the change time ΔTc (step S56).

  If the CPU 20 determines that the delay time ΔTd is longer than the change time ΔTc (YES in step S56), the CPU 20 changes the setting information by setting the change destination setting information in the audio processing unit 16 (step S57). The sound change process is terminated. When determining in step S55 whether or not the elapsed time ΔTs is longer than the delay time ΔTd, the CPU 20 obtains the delay time ΔTd when it is determined that the elapsed time ΔTs is not longer than the delay time ΔTd (NO in step S55). The process returns to step S51. When determining in step S56 whether or not the delay time ΔTd is longer than the change time ΔTc, the CPU 20 acquires the delay time ΔTd if it is determined that the delay time ΔTd is not longer than the change time ΔTc (NO in step S56). The process returns to step S51.

  Step S55 of the sound change process shown in FIG. 11 may be replaced by the CPU 20 so as to determine whether or not the elapsed time ΔTs is longer than the change time ΔTc. In this case, when the CPU 20 does not determine that the elapsed time ΔTs is longer than the change time ΔTc, the process moves to step S51 for acquiring the delay time ΔTd, and when the elapsed time ΔTs is determined to be longer than the change time ΔTc. The process may be moved to step S57 for changing the setting information.

  Although the delay time table 251 shows the case where each delay time of the video signal delayed by each video processing is stored, the present invention is not limited to this, and the video signal and audio processing unit output from the video processing unit 13 are not limited thereto. 16 may be experimentally obtained to store a delay time including a delay due to other processing such as processing by the audio processing unit 16. Also, the case where the delay time ΔTd is read from the delay time table 251 and set in the delay unit 15 has been shown, but the present invention is not limited to this, and the delay time ΔTd is determined based on the synchronization signal included in each of the video signal and the audio signal. However, the delay unit 15 may be set.

  Although the bass emphasis function for emphasizing bass by changing the frequency characteristics of the audio signal by the frequency characteristic changing unit 162 is shown, the present invention is not limited to this, and a harmonic signal generated from the audio signal is superimposed on the audio signal. The bass may be emphasized by outputting. The setting information set in the sound processing unit 16 is not limited to the case where each function is in an on / off state, but the frequency characteristic changed by the frequency characteristic changing unit 162 and the destination changed by the volume changing unit 161 It may consist of parameters used in processing executed by the audio processing unit 16 such as volume.

Embodiment 2
FIG. 12 is a block diagram showing an internal configuration of the video / audio output device according to the second embodiment. The second embodiment reads and executes the computer program stored in the ROM in the first embodiment, whereas the computer program recorded in a rewritable EEPROM (Electrically Erasable Programmable Read-Only Memory). Read and execute. In the figure, reference numeral 5 denotes a video / audio output device, which includes an EEPROM 51 and a recording medium reading unit 52 which are composed of a flash memory or the like connected to the CPU 20 via a bus 20a.

  The video / audio output device 5 reads the computer program 521 from a recording medium 520 such as a CD (Compact Disk) -ROM or a DVD (Digital Versatile Disk) -ROM inserted into the recording medium reading unit 52 and stores it in the EEPROM 51. It is. The CPU 20 is configured to execute processing necessary for the video / audio output device 5 in accordance with the computer program 521 of the present invention read from the EEPROM 51.

  The computer program 521 determines whether or not the elapsed time ΔTs from when the silence signal is detected from the audio signal is longer than the change time ΔTc corresponding to the setting information of the change destination read from the change time table 253 (first). Judgment step). The computer program 521 determines whether or not the delay time ΔTd set in the delay unit 15 is longer than the change time ΔTc (second determination step). When the computer program 521 determines that the elapsed time ΔTs is longer than the change time ΔTc and determines that the delay time ΔTd is longer than the change time ΔTc, the computer program 521 uses the setting information set in the audio processing unit 16 as the change destination. Change to setting information (change step).

  The computer program 521 according to the present invention is not limited to the case where the computer program 521 is read from the recording medium 520 and stored in the EEPROM 51, and the EEPROM 51 storing the computer program 521 at the time of factory shipment may be installed in the video / audio output device 5. . Further, the computer program 521 may be stored in a ROM built in the DSP as firmware executed by a video / audio output device including a DSP.

  The second embodiment is configured as described above, and the other configurations, operations, and processes are the same as those of the first embodiment. Therefore, corresponding parts are denoted by the same reference numerals and process names, and detailed descriptions thereof are given. Omitted.

2 is a block diagram illustrating an internal configuration example of the video / audio output device according to Embodiment 1. FIG. 3 is a block diagram illustrating configurations of a video processing unit and an audio processing unit according to Embodiment 1. FIG. 6 is a chart showing a record layout example of a delay time table according to the first embodiment. 10 is a chart showing a record layout example of a voice setting table according to the first embodiment. 6 is a chart showing a record layout example of a change time table according to the first embodiment. 3 is a timing chart showing a relationship among an input video signal, an output video signal, an input audio signal, and a delayed audio signal according to Embodiment 1. 5 is a timing chart showing the relationship between an input audio signal and a delayed audio signal for explaining timings at which setting information according to Embodiment 1 is changed. 4 is a flowchart showing a procedure of delay time setting processing according to the first embodiment. 3 is a flowchart showing a procedure of a silent period timing process according to the first embodiment. 4 is a flowchart illustrating a procedure of voice switching processing according to the first embodiment. 4 is a flowchart showing a procedure of voice change processing according to the first embodiment. 6 is a block diagram illustrating an internal configuration of a video / audio output device according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,5 Video | voice audio | voice output apparatus 3 Display apparatus 4a Speaker 4b Woofer 11 Input part 12 Separation part 13 Video | video process part 14 Video | video output part 15 Delay part 16 Audio | voice processing part 17a, 17b Audio | voice output part 18 Volume | volume detection part 19 Type discrimination | determination part 20 CPU
20a Bus 21 Operation receiving part 22 ROM
23 RAM
24 Timekeeping unit 25 Storage unit 51 EEPROM
52 Recording Medium Reading Unit 251 Delay Time Table 252 Audio Setting Table 253 Change Time Table 520 Recording Medium 521 Computer Program

Claims (7)

An input unit that receives a video signal and an audio signal synchronized with the video signal, a video processing unit that processes the received video signal according to a video to be displayed, and the audio signal is processed by the video processing unit after being delayed In a video / audio output device comprising a delay means for synchronizing with the video signal, and outputting the processed video signal and an audio signal synchronized with the video signal,
Audio processing means for processing an audio signal received by the input means based on setting information;
Changing means for changing the setting information to different setting information;
An acquisition unit for acquiring a change time required for the processing change by the voice processing unit according to the change by the change unit;
Detecting means for detecting a silence signal included in the audio signal received by the input means;
A period of time during which the detection means is detecting a silence signal, a time measurement means for measuring the elapsed time from the time when the silence signal was detected;
First determination means for determining whether or not the elapsed time measured by the timing means is longer than the change time acquired by the acquisition means;
A second determination unit that determines whether or not the delay time delayed by the delay unit is longer than the change time acquired by the acquisition unit;
The change means is different when the first determination means determines that the elapsed time is longer than the change time and the second determination means determines that the delay time is longer than the change time. A video / audio output device configured to change to setting information. An input unit that receives a video signal and an audio signal synchronized with the video signal, a video processing unit that processes the received video signal according to a video to be displayed, and the audio signal is processed by the video processing unit after being delayed In a video / audio output device comprising a delay means for synchronizing with the video signal, and outputting the processed video signal and an audio signal synchronized with the video signal,
Audio processing means for processing an audio signal received by the input means based on setting information;
Changing means for changing the setting information to different setting information;
An acquisition unit for acquiring a change time required for the processing change by the voice processing unit according to the change by the change unit;
Detecting means for detecting a silence signal included in the audio signal received by the input means;
A period of time during which the detection means is detecting a silence signal, a time measurement means for measuring the elapsed time from the time when the silence signal was detected;
First determination means for determining whether or not the elapsed time measured by the time measuring means is longer than a delay time of the audio signal delayed by the delay means;
Second determination means for determining whether or not the delay time is longer than the change time acquired by the acquisition means;
The changing means is determined after the time when the first determining means determines that the elapsed time is longer than the delay time, and the second determining means determines that the delay time is longer than the change time. A video / audio output device configured to change to different setting information. A storage means for storing each of a plurality of setting information in association with a plurality of change times,
The changing means is configured to change to a selected setting information from a plurality of setting information stored in the storage means,
The video / audio according to claim 1 or 2, wherein the acquisition unit is configured to read a change time stored in the storage unit in association with the setting information selected by the change unit. Output device. The video signal includes additional information indicating the type of video content,
The video / audio output apparatus according to any one of claims 1 to 3, wherein the changing unit is configured to change the setting information in accordance with the additional information.   5. The video / audio according to claim 1, wherein the audio processing unit is configured to perform a process of changing a frequency characteristic and / or a volume of the audio signal. 6. Output device.   6. The apparatus according to claim 5, further comprising an off unit that turns off driving of a speaker for emitting a low frequency component when the audio processing unit is changed to remove the low frequency component of the audio signal. Video and audio output device. In a computer program for delaying an audio signal processed based on setting information and changing the setting information to different setting information in a computer included in a video / audio output device that outputs the video signal together with the video signal,
In the computer,
A first determination step of determining whether a silent period included in the audio signal is longer than a change time required for changing the process on the audio signal in response to the change to the different setting information;
A second determination step of determining whether a delay time of delaying the audio signal based on the setting information is longer than the change time;
When the first determination step determines that the silence period is longer than the change time, and the second determination step determines that the delay time is longer than the change time, the change to change to the different setting information A computer program for executing the steps.

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