US20010055475A1 - Audio and video recording and reproduction apparatus - Google Patents
Audio and video recording and reproduction apparatus Download PDFInfo
- Publication number
- US20010055475A1 US20010055475A1 US09/892,926 US89292601A US2001055475A1 US 20010055475 A1 US20010055475 A1 US 20010055475A1 US 89292601 A US89292601 A US 89292601A US 2001055475 A1 US2001055475 A1 US 2001055475A1
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- Prior art keywords
- audio
- video
- reproduction
- signal
- audio signal
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/926—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation
- H04N5/9265—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation with processing of the sound signal
- H04N5/9267—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/84—Television signal recording using optical recording
- H04N5/85—Television signal recording using optical recording on discs or drums
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
Definitions
- the present invention relates to an audio and video recording and reproduction apparatus, and in particular to an audio and video recording and reproduction apparatus for reproducing a plurality of information recording media having audio signals having different volume levels stored thereon.
- V-CDs Video-CDs
- CD-Audio CD-Audio
- An audio and video recording and reproduction apparatus includes an audio signal switch section for outputting one of a first audio signal having a first volume level and a second audio signal having a second volume level by a switching operation; and a mute section for muting the first audio signal which is output from the audio signal switch section when the audio signal switch section switches the second audio signal to the first audio signal.
- the mute section mutes the second audio signal which is output from the audio signal switch section when the audio signal switch section switches the first audio signal to the second audio signal.
- the first audio signal includes an external audio signal.
- the first audio signal includes an audio signal reproduced from an audio and video recording and reproduction medium.
- the second audio signal includes an audio signal reproduced from an audio and video reproduction-only medium.
- the second audio signal includes an audio signal reproduced from an audio reproduction-only medium.
- the first audio signal includes an external audio signal.
- the second audio signal is reproduced from a reproduction-only medium.
- the first volume level of the first audio signal and the second volume level of the second audio signal are different from each other.
- the audio and video recording and reproduction apparatus has a reproduction mode for reproducing the second audio signal from the reproduction-only medium and a stop mode for stopping the reproduction of the second audio signal from the reproduction-only medium.
- the audio signal switch section switches the second audio signal to the first audio signal when the reproduction mode is switched to the stop mode.
- the audio and video recording and reproduction apparatus further includes a video switch section for outputting a first video signal corresponding to the first audio signal or a second video signal corresponding to the second audio signal by a switching operation.
- the first video signal includes an external video signal.
- the first video signal includes a video signal reproduced from an audio and video recording and reproduction medium.
- the second video signal includes a video signal reproduced from an audio and video reproduction-only medium.
- the second video signal includes a still picture signal reproduced from a still picture signal medium.
- the second video signal includes a third video signal reproduced from the audio and video reproduction-only medium and a still picture signal reproduced from a still picture signal medium.
- the audio and video recording and reproduction apparatus has a reproduction mode for reproducing the third video signal from the audio and video reproduction-only medium and a stop mode for stopping the reproduction of the third video signal from the audio and video reproduction-only medium.
- the video signal switch section switches the third video signal to the still picture signal when the reproduction mode is switched to the stop mode.
- the second video signal includes a still picture signal reproduced from a still picture medium.
- the video switch section outputs the still picture signal when the mute section mutes the first audio signal.
- the invention described herein makes possible the advantages of providing an audio and video recording and reproduction apparatus usable to reproduce audio signals having different volume levels, which prevents an audio signal having a different volume level from the previously reproduced audio signal from being output, and thus prevents the user from feeling uncomfortable.
- FIG. 1 is a block diagram illustrating a structure of an audio and video recording and reproduction apparatus according to one example of the present invention
- FIG. 2 shows the relationship between an average volume level output from the audio and video recording and reproduction apparatus shown in FIG. 1, an input medium and an operation mode thereof;
- FIG. 3 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus shown in FIG. 1 when a reproduction mode is switched to a stop mode while a CD-A medium is mounted on the audio and video recording and reproduction apparatus;
- FIG. 4 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus shown in FIG. 1 when a reproduction mode is switched to a stop mode while a DVD-Video medium or a V-CD medium is mounted on the audio and video recording and reproduction apparatus;
- FIG. 5 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus shown in FIG. 1 when a switching operation between a recording mode, a stop mode and a reproduction mode is performed while DVD-Recording medium is mounted on the audio and video recording and reproduction apparatus.
- FIG. 1 is a block diagram of an audio and video recording and reproduction apparatus 100 according to one example of the present invention.
- the audio and video recording and reproduction apparatus 100 includes an audio and video recording circuit 101 , audio and video reproduction circuits 102 and 103 , an audio reproduction circuit 104 , a still picture reproduction circuit 105 , an audio mute circuit 106 , a medium recording and reproduction circuit 107 , an output signal switch circuit 108 , a system control section 109 , an audio input terminal 110 , a video input terminal 111 , an audio output terminal 112 and a video output terminal 113 .
- the audio and video recording and reproduction apparatus 100 performs recording or reproduction of a video signal and/or an audio signal to and from the information medium 120 .
- the information medium 120 can be one of an audio and video recording and reproduction medium 121 , a first audio and video reproduction-only medium 122 A, a second audio and video reproduction-only medium 122 B, and an audio reproduction-only medium 123 .
- the audio and video recording and reproduction medium 121 can be a DVD-Recording medium.
- the first audio and video reproduction-only medium 122 A can be a DVD-Video medium.
- the second audio and video reproduction-only medium 122 B can be a V-CD medium.
- the audio reproduction-only medium 123 can be a CD-A medium.
- the audio and video recording and reproduction apparatus 100 records a video signal and an audio signal to the audio and video recording and reproduction medium 121 , and reproduces a video signal and an audio signal from the audio and video recording and reproduction medium 121 .
- the audio and video recording and reproduction apparatus 100 reproduces a video signal and an audio signal from the first audio and video reproduction-only medium 122 A and the second audio and video reproduction-only medium 122 B.
- the audio and video recording and reproduction apparatus 100 reproduces an audio signal from the audio reproduction-only medium 123 .
- the audio and video recording circuit 101 receives an external audio signal 124 which is input to the audio input terminal 110 and performs processing of the external audio signal 124 necessary to record the external audio signal 124 to the audio and video recording and reproduction medium 121 .
- the medium recording and reproduction circuit 107 records the external audio signal 124 processed by the audio and video recording circuit 101 to the audio and video recording and reproduction medium 121 .
- the audio and video recording circuit 101 also receives an external video signal 125 which is input to the video input terminal 111 and performs processing of the external video signal 125 necessary to record the external video signal 125 to the audio and video recording and reproduction medium 121 .
- the medium recording and reproduction circuit 107 records the external video signal 125 processed by the audio and video recording circuit 101 to the audio and video recording and reproduction medium 121 .
- the medium recording and reproduction circuit 107 reproduces an audio signal 126 and a video signal 127 recorded on the audio and video recording and reproduction medium 121 .
- the audio and video reproduction circuit 102 performs processing of the audio signal 126 and the video signal 127 necessary to output the audio signal 126 and the video signal 127 respectively from the audio output terminal 112 and the video output terminal 113 .
- the medium recording and reproduction circuit 107 reproduces an audio signal 128 A and a video signal 129 A recorded on the first audio and video reproduction-only medium 122 A.
- the audio and video reproduction circuit 103 performs processing of the audio signal 128 A and the video signal 129 A necessary to output the audio signal 128 A and the video signal 129 A respectively from the audio output terminal 112 and the video output terminal 113 .
- the medium recording and reproduction circuit 107 reproduces an audio signal 128 B and a video signal 129 B recorded on the second audio and video reproduction-only medium 122 B.
- the audio and video reproduction circuit 103 performs processing of the audio signal 128 B and the video signal 129 B necessary to output the audio signal 128 B and the video signal 129 B respectively from the audio output terminal 112 and the video output terminal 113 .
- the medium recording and reproduction circuit 107 reproduces an audio signal 130 recorded on the audio reproduction-only medium 123 .
- the audio reproduction circuit 104 performs processing of the audio signal 130 necessary to output the audio signal 130 from the audio output terminal 112 .
- the still picture reproduction circuit 105 outputs a still picture signal 131 reproduced from a still picture medium 105 A.
- the audio signal 126 reproduced by the audio and video recording and reproduction medium 121 and the external audio signal 124 input to the audio input terminal 110 have an average volume level A1 (first volume level).
- the audio signal 128 A reproduced from the first audio and video reproduction-only medium 122 A has an average volume level B1 (second volume level).
- the audio signal 128 B reproduced from the second audio and video reproduction-only medium 122 B has an average volume level C1 (second volume level).
- the audio signal 130 reproduced from the audio reproduction-only medium 123 has an average volume level D1 (second volume level).
- the average volume level will also be referred to as a “volume level” for the sake of simplicity.
- the output signal switch circuit 108 switches the audio signals 126 , 124 , 128 A, 128 B and 130 to output one of these signal from the audio output terminal 112 .
- the audio mute circuit 106 mutes the audio signal 126 output from the audio output terminal 112 .
- the audio mute circuit 106 mutes the external audio signal 124 output from the audio output terminal 112 .
- the audio mute circuit 106 mutes the audio signal 126 output from the audio output terminal 112 .
- the audio mute circuit 106 mutes the external audio signal 124 output from the audio output terminal 112 .
- the audio mute circuit 106 mutes the audio signal 126 output from the audio output terminal 112 .
- the audio mute circuit 106 mutes the external audio signal 124 output from the audio output terminal 112 .
- the system control section 109 controls operations of the entire audio and video recording and reproduction apparatus 100 including the output signal switch circuit 108 and the medium recording reproduction circuit 107 .
- the audio mute circuit 106 mutes the audio signal 126 or the external audio signal 124 output from the audio output terminal 112 .
- the audio mute circuit 106 mutes the audio signal 128 A (B1), 128 B (C1) or 130 (D1) output from the audio output terminal 112 .
- FIG. 2 shows the relationship between an average volume level output from the audio and video recording and reproduction apparatus 100 (FIG. 1), an input medium and an operation mode thereof.
- the input media used for the audio and video recording and reproduction apparatus 100 include the audio and video recording and reproduction medium 121 (e.g., DVD-Recording medium), the first audio and video reproduction-only medium 122 A (e.g., DVD-Video medium), the second audio and video reproduction-only medium 122 B (e.g., V-CD medium), and the audio reproduction-only medium 123 (e.g., CD-A medium).
- Operation modes of the audio and video recording and reproduction apparatus 100 include a stop mode 141 , a reproduction mode 142 and a recording mode 143 .
- the stop mode 141 includes a first stop mode 145 and a second stop mode 144 .
- the audio and video recording and reproduction apparatus 100 when the input medium is the audio and video recording and reproduction medium 121 , the audio and video recording and reproduction apparatus 100 outputs an audio signal having a volume level A1 in any of the stop mode 141 , the reproduction mode 142 and the recording mode 143 as described below.
- the audio and video recording and reproduction apparatus 100 In the stop mode 141 and the recording mode 143 , the audio and video recording and reproduction apparatus 100 outputs the external video signal 124 (A1) which is input to the audio input terminal 110 .
- the external video signal 124 can be, for example, an audio signal from a TV.
- the audio and video recording and reproduction apparatus 100 In the reproduction mode 142 , the audio and video recording and reproduction apparatus 100 outputs the audio signal 126 (A1) reproduced from the audio and video recording and reproduction medium 121 .
- the audio and video recording and reproduction apparatus 100 When the input medium is the first audio and video reproduction-only medium 122 A and the operation mode is the reproduction mode 142 , the audio and video recording and reproduction apparatus 100 outputs the audio signal 128 A (B1) reproduced from the first audio and video reproduction-only medium 122 A.
- the audio and video recording and reproduction apparatus 100 When the input medium is the second audio and video reproduction-only medium 122 B and the operation mode is the reproduction mode 142 , the audio and video recording and reproduction apparatus 100 outputs the audio signal 128 B (C1) reproduced from the first audio and video reproduction-only medium 122 B.
- the audio and video recording and reproduction apparatus 100 When the input medium is the audio reproduction-only medium 123 and the operation mode is the reproduction mode 142 , the audio and video recording and reproduction apparatus 100 outputs the audio signal 130 (D1) reproduced from the audio reproduction-only medium 123 .
- the audio mute circuit 106 (FIG. 1) mutes the external audio signal 124 (A1) output from the audio output terminal 112 (FIG. 1).
- the audio and video recording and reproduction apparatus 100 outputs the external audio signal 124 (A1).
- FIG. 3 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus 100 when the reproduction mode 142 is switched to the stop mode 141 while the input medium is the audio reproduction-only medium 123 (e.g., CD-A).
- the audio reproduction-only medium 123 e.g., CD-A
- the audio and video recording and reproduction apparatus 100 starts reproduction of the audio reproduction-only medium 123 .
- the output switch circuit 108 outputs the audio signal 130 (D1) reproduced from the audio reproduction-only medium 123 .
- the output switch circuit 108 outputs the still picture signal 131 , which is output from the still picture reproduction circuit 105 , through the video output terminal 113 .
- the reproduction mode 142 is switched to the first stop mode 145 .
- the output switch circuit 108 switches the audio signal to be output through the audio output terminal 112 from the audio signal 130 (D1) to the external audio signal 124 (A1).
- the audio mute circuit 106 mutes the external audio signal 124 .
- the output switch circuit 108 continuously outputs the still picture signal 131 from the video output terminal 113 .
- the first stop mode 145 is switched to the reproduction mode 142 .
- the audio and video recording and reproduction apparatus 100 resumes reproduction of the audio reproduction-only medium 123 .
- the output switch circuit 108 outputs the audio signal 130 (D1) from the audio output terminal 112 .
- the output switch circuit 108 continuously outputs the still picture signal 131 from the video output terminal 113 .
- the reproduction mode 142 is again switched to the first stop mode 145 .
- the output switch circuit 108 switches the audio signal to be output through the audio output terminal 112 from the audio signal 130 (D1) to the external audio signal 124 (A1).
- the audio mute circuit 106 mutes the external audio signal 124 .
- the output switch circuit 108 continuously outputs the still picture signal 131 from the video output terminal 113 .
- the audio mute circuit 106 releases the mute setting of the external audio signal 124 (A1).
- the output switch circuit 108 outputs the external audio signal 124 (A1) released from the muted state.
- the output switch circuit 108 outputs the external video signal 125 which is input to the video input terminal 111 (FIG. 1).
- FIG. 4 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus 100 when the reproduction mode 142 is switched to the stop mode 141 while the input medium is the first audio and video reproduction-only medium 122 A (e.g., DVD-Video) or the second audio and video reproduction-only medium 122 B (e.g., V-CD).
- first audio and video reproduction-only medium 122 A e.g., DVD-Video
- second audio and video reproduction-only medium 122 B e.g., V-CD
- the audio and video recording and reproduction apparatus 100 starts reproduction of the first audio and video reproduction-only medium 122 A or the second audio and video reproduction-only medium 122 B.
- the output switch circuit 108 outputs the video signal 129 A reproduced from the first audio and video reproduction-only medium 122 A or the video signal 129 B reproduced from second audio and video reproduction-only medium 122 B through the video output terminal 113 (FIG. 1).
- the output switch circuit 108 outputs the audio signal 128 A (B1) reproduced from the first audio and video reproduction-only medium 122 A or the audio signal 128 B (C1) reproduced from second audio and video reproduction-only medium 122 B through the video output terminal 113 .
- the reproduction mode 142 is switched to the first stop mode 145 .
- the output switch circuit 108 switches the video signal to be output through the video output terminal 113 from the video signal 129 A or 129 B to the still picture signal 131 output from the still picture reproduction circuit 105 .
- the output switch circuit 108 switches the audio signal to be output through the audio output terminal 112 from the audio signal 128 A (B1) or 128 B (C1) to the external audio signal 124 (A1).
- the audio mute circuit 106 mutes the external audio signal 124 .
- the first stop mode 145 is switched to the reproduction mode 142 .
- the audio and video recording and reproduction apparatus 100 resumes reproduction of the first audio and video reproduction-only medium 122 A or the second audio and video reproduction-only medium 122 B.
- the output switch circuit 108 outputs the audio signal 128 A (B1) reproduced from the first audio and video reproduction-only medium 122 A or the audio signal 128 B (C1) reproduced from the second audio and video reproduction-only medium 122 B.
- the output switch circuit 108 switches the video signal to be output through the video output terminal 113 from the still picture signal 131 to the video signal 129 A reproduced from the first audio and video reproduction-only medium 122 A or the video signal 129 B reproduced from the second audio and video reproduction-only medium 122 B.
- the reproduction mode 142 is again switched to the first stop mode 145 .
- the output switch circuit 108 switches the audio signal to be output through the audio output terminal 112 from the audio signal 128 A (B1) or the audio signal 128 B (C1) to the external audio signal 124 (A1).
- the audio mute circuit 106 mutes the external audio signal 124 .
- the output switch circuit 108 switches the video signal to be output through the video output terminal 113 from the video signal 129 A or 129 B to the still picture signal 131 from the video output terminal 113 .
- the audio mute circuit 106 releases mute of the external audio signal 124 (A1).
- the output switch circuit 108 outputs the external audio signal 124 (A1) released from the muted state.
- the output switch circuit 108 outputs the external video signal 125 which is input to the video input terminal 111 (FIG. 1).
- the audio signal to be output through the audio output terminal 112 is switched from the audio signal 128 A (B1) reproduced from the first audio and video reproduction-only medium 122 A (DVD-Video) or the audio signal 128 B (C1) reproduced from the second audio and video reproduction-only medium 122 B (V-CD) to the external audio signal 124 (A1) (time t7 and t9), the external audio signal 124 (A1) is muted.
- FIG. 5 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus 100 when a switching operation between the recording mode 143 , the stop mode 141 and the reproduction mode 142 is performed while the input medium is the audio and video recording and reproduction medium 121 (DVD-Recording).
- the audio and video recording and reproduction apparatus 100 starts recording to the audio and video recording and reproduction medium 121 .
- the output switch circuit 108 outputs the external video signal 125 , which is input through the video input terminal 111 , through the video output terminal 113 .
- the output switch circuit 108 outputs the external audio signal 124 (A1), which is input through the audio input terminal 110 , through the audio output terminal 112 .
- the recording mode 143 is switched to the stop mode 141 .
- the audio and video recording and reproduction apparatus 100 stops recording to the audio and video recording and reproduction medium 121 .
- the output switch circuit 108 continuously outputs the external video signal 125 through the video output terminal 113 .
- the output switch circuit 108 continuously outputs the external audio signal 124 (A1) through the audio output terminal 112 .
- the first stop mode 141 is switched to the reproduction mode 142 .
- the audio and video recording and reproduction apparatus 100 starts reproduction of the audio and video recording and reproduction medium 121 .
- the output switch circuit 108 outputs the video signal 127 reproduced from the audio and video recording and reproduction medium 121 through the video output terminal 113 .
- the output switch circuit 108 outputs the audio signal 126 (A1) reproduced from the audio and video recording and reproduction medium 121 through the audio output terminal 112 .
- the reproduction mode 142 is switched to the stop mode 141 .
- the output switch circuit 108 switches the video signal to be output through the video output terminal 113 from the video signal 127 to the external video signal 125 which is input from the video input terminal 111 .
- the output switch circuit 108 outputs the external video signal 125 through the video output terminal 113 .
- the output switch circuit 108 switches the audio signal to be output through the audio output terminal 112 from the audio signal 126 (A1) to the external audio signal 124 which is input from the video input terminal 112 .
- the output switch circuit 108 outputs the external audio signal 124 through the audio output terminal 112 .
- the average volume level output from the audio output terminal 112 is the same (A1) in the recording mode 143 , the reproduction mode 142 and the stop mode 141 . Accordingly, no mute operation is performed after a switching operation between the recording mode 143 , the reproduction mode 142 and the stop mode 141 is performed.
- an external audio signal for example, au audio signal from a TV tuner
- audio signal stored on various media having different volume levels for example, the first audio and video reproduction-only medium 122 A (e.g., DVD-Video), the second audio and video reproduction-only medium 122 B (e.g., V-CD), and the audio reproduction-only medium 123 (e.g., CD-A)
- the following problem may occur.
- the external audio signal is output immediately after the reproduction of the medium is stopped, the volume is suddenly increased or decreased due to the difference in volume levels of the different audio signals.
- the audio and video recording and reproduction apparatus 100 in this example mutes the audio signal output therefrom and outputs a still picture signal as the video signal.
- the above-mentioned disturbance felt by the user is solved even when one type of audio signal is switched to another type of audio signal having a different volume level from the one output before.
- the external audio signal 124 and the external video signal 125 are output without being processed in any way in the recording mode 143 and the stop mode 141 .
- input signals (the external audio signal 124 and the external video signal 125 ) are monitored without being processed in any way in the recording mode 143 and the stop mode 141 , although not in the reproduction mode 142 .
- the present invention provides an audio and video recording and reproduction apparatus usable to reproduce audio signals having different volume levels, which prevents an audio signal having a different volume level from the previously reproduced audio signal from being output, and thus prevents the user from feeling uncomfortable.
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- Engineering & Computer Science (AREA)
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- Signal Processing (AREA)
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- Television Signal Processing For Recording (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to an audio and video recording and reproduction apparatus, and in particular to an audio and video recording and reproduction apparatus for reproducing a plurality of information recording media having audio signals having different volume levels stored thereon.
- 2. Description of the Related Art
- Recently, audio and video recording and reproduction apparatuses for reproducing a plurality of types of information recording media, for example, DVD-Recording, DVD-Video disks, Video-CDs (hereinafter, referred to as “V-CDs”) and CD-Audio (hereinafter, referred to as a “CD-A”), have been used.
- These plurality of types of information recording media respectively have audio signals having different volume levels stored thereon.
- When an operation mode of such an audio and video recording and reproduction apparatus is switched in order to reproduce a different type of information recording medium, an audio signal having a different volume level from the audio signal which was output before the switching can be suddenly output. This causes a user to feel uncomfortable.
- An audio and video recording and reproduction apparatus according to the present invention includes an audio signal switch section for outputting one of a first audio signal having a first volume level and a second audio signal having a second volume level by a switching operation; and a mute section for muting the first audio signal which is output from the audio signal switch section when the audio signal switch section switches the second audio signal to the first audio signal.
- In one embodiment of the invention, the mute section mutes the second audio signal which is output from the audio signal switch section when the audio signal switch section switches the first audio signal to the second audio signal.
- In one embodiment of the invention, the first audio signal includes an external audio signal.
- In one embodiment of the invention, the first audio signal includes an audio signal reproduced from an audio and video recording and reproduction medium.
- In one embodiment of the invention, the second audio signal includes an audio signal reproduced from an audio and video reproduction-only medium.
- In one embodiment of the invention, the second audio signal includes an audio signal reproduced from an audio reproduction-only medium.
- In one embodiment of the invention, the first audio signal includes an external audio signal. The second audio signal is reproduced from a reproduction-only medium. The first volume level of the first audio signal and the second volume level of the second audio signal are different from each other. The audio and video recording and reproduction apparatus has a reproduction mode for reproducing the second audio signal from the reproduction-only medium and a stop mode for stopping the reproduction of the second audio signal from the reproduction-only medium. The audio signal switch section switches the second audio signal to the first audio signal when the reproduction mode is switched to the stop mode.
- In one embodiment of the invention, the audio and video recording and reproduction apparatus further includes a video switch section for outputting a first video signal corresponding to the first audio signal or a second video signal corresponding to the second audio signal by a switching operation.
- In one embodiment of the invention, the first video signal includes an external video signal.
- In one embodiment of the invention, the first video signal includes a video signal reproduced from an audio and video recording and reproduction medium.
- In one embodiment of the invention, the second video signal includes a video signal reproduced from an audio and video reproduction-only medium.
- In one embodiment of the invention, the second video signal includes a still picture signal reproduced from a still picture signal medium.
- In one embodiment of the invention, the second video signal includes a third video signal reproduced from the audio and video reproduction-only medium and a still picture signal reproduced from a still picture signal medium. The audio and video recording and reproduction apparatus has a reproduction mode for reproducing the third video signal from the audio and video reproduction-only medium and a stop mode for stopping the reproduction of the third video signal from the audio and video reproduction-only medium. The video signal switch section switches the third video signal to the still picture signal when the reproduction mode is switched to the stop mode.
- In one embodiment of the invention, the second video signal includes a still picture signal reproduced from a still picture medium. The video switch section outputs the still picture signal when the mute section mutes the first audio signal.
- Thus, the invention described herein makes possible the advantages of providing an audio and video recording and reproduction apparatus usable to reproduce audio signals having different volume levels, which prevents an audio signal having a different volume level from the previously reproduced audio signal from being output, and thus prevents the user from feeling uncomfortable.
- These and other advantages of the present invention will become apparent to those skilled in the art upon reading and understanding the following detailed description with reference to the accompanying figures.
- FIG. 1 is a block diagram illustrating a structure of an audio and video recording and reproduction apparatus according to one example of the present invention;
- FIG. 2 shows the relationship between an average volume level output from the audio and video recording and reproduction apparatus shown in FIG. 1, an input medium and an operation mode thereof;
- FIG. 3 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus shown in FIG. 1 when a reproduction mode is switched to a stop mode while a CD-A medium is mounted on the audio and video recording and reproduction apparatus;
- FIG. 4 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus shown in FIG. 1 when a reproduction mode is switched to a stop mode while a DVD-Video medium or a V-CD medium is mounted on the audio and video recording and reproduction apparatus; and
- FIG. 5 is a timing diagram illustrating an operation performed by the audio and video recording and reproduction apparatus shown in FIG. 1 when a switching operation between a recording mode, a stop mode and a reproduction mode is performed while DVD-Recording medium is mounted on the audio and video recording and reproduction apparatus.
- Hereinafter, the present invention will be described by way of illustrative examples with reference to the accompanying drawings.
- FIG. 1 is a block diagram of an audio and video recording and
reproduction apparatus 100 according to one example of the present invention. - Referring to FIG. 1, the audio and video recording and
reproduction apparatus 100 includes an audio andvideo recording circuit 101, audio andvideo reproduction circuits audio reproduction circuit 104, a stillpicture reproduction circuit 105, anaudio mute circuit 106, a medium recording andreproduction circuit 107, an outputsignal switch circuit 108, asystem control section 109, anaudio input terminal 110, avideo input terminal 111, anaudio output terminal 112 and avideo output terminal 113. - The audio and video recording and
reproduction apparatus 100 performs recording or reproduction of a video signal and/or an audio signal to and from theinformation medium 120. Theinformation medium 120 can be one of an audio and video recording andreproduction medium 121, a first audio and video reproduction-onlymedium 122A, a second audio and video reproduction-onlymedium 122B, and an audio reproduction-onlymedium 123. The audio and video recording andreproduction medium 121 can be a DVD-Recording medium. The first audio and video reproduction-onlymedium 122A can be a DVD-Video medium. The second audio and video reproduction-onlymedium 122B can be a V-CD medium. The audio reproduction-onlymedium 123 can be a CD-A medium. - The audio and video recording and
reproduction apparatus 100 records a video signal and an audio signal to the audio and video recording andreproduction medium 121, and reproduces a video signal and an audio signal from the audio and video recording andreproduction medium 121. The audio and video recording andreproduction apparatus 100 reproduces a video signal and an audio signal from the first audio and video reproduction-onlymedium 122A and the second audio and video reproduction-onlymedium 122B. The audio and video recording andreproduction apparatus 100 reproduces an audio signal from the audio reproduction-only medium 123. - The audio and
video recording circuit 101 receives anexternal audio signal 124 which is input to theaudio input terminal 110 and performs processing of theexternal audio signal 124 necessary to record theexternal audio signal 124 to the audio and video recording andreproduction medium 121. The medium recording andreproduction circuit 107 records theexternal audio signal 124 processed by the audio andvideo recording circuit 101 to the audio and video recording andreproduction medium 121. The audio andvideo recording circuit 101 also receives anexternal video signal 125 which is input to thevideo input terminal 111 and performs processing of theexternal video signal 125 necessary to record theexternal video signal 125 to the audio and video recording andreproduction medium 121. The medium recording andreproduction circuit 107 records theexternal video signal 125 processed by the audio andvideo recording circuit 101 to the audio and video recording andreproduction medium 121. - The medium recording and
reproduction circuit 107 reproduces anaudio signal 126 and avideo signal 127 recorded on the audio and video recording andreproduction medium 121. The audio andvideo reproduction circuit 102 performs processing of theaudio signal 126 and thevideo signal 127 necessary to output theaudio signal 126 and thevideo signal 127 respectively from theaudio output terminal 112 and thevideo output terminal 113. - The medium recording and
reproduction circuit 107 reproduces anaudio signal 128A and avideo signal 129A recorded on the first audio and video reproduction-onlymedium 122A. The audio andvideo reproduction circuit 103 performs processing of theaudio signal 128A and thevideo signal 129A necessary to output theaudio signal 128A and thevideo signal 129A respectively from theaudio output terminal 112 and thevideo output terminal 113. - The medium recording and
reproduction circuit 107 reproduces anaudio signal 128B and avideo signal 129B recorded on the second audio and video reproduction-onlymedium 122B. The audio andvideo reproduction circuit 103 performs processing of theaudio signal 128B and thevideo signal 129B necessary to output theaudio signal 128B and thevideo signal 129B respectively from theaudio output terminal 112 and thevideo output terminal 113. - The medium recording and
reproduction circuit 107 reproduces anaudio signal 130 recorded on the audio reproduction-onlymedium 123. Theaudio reproduction circuit 104 performs processing of theaudio signal 130 necessary to output theaudio signal 130 from theaudio output terminal 112. The still picturereproduction circuit 105 outputs a still picture signal 131 reproduced from a still picture medium 105A. - The
audio signal 126 reproduced by the audio and video recording andreproduction medium 121 and theexternal audio signal 124 input to theaudio input terminal 110 have an average volume level A1 (first volume level). Theaudio signal 128A reproduced from the first audio and video reproduction-only medium 122A has an average volume level B1 (second volume level). Theaudio signal 128B reproduced from the second audio and video reproduction-only medium 122B has an average volume level C1 (second volume level). Theaudio signal 130 reproduced from the audio reproduction-only medium 123 has an average volume level D1 (second volume level). In the following description, the average volume level will also be referred to as a “volume level” for the sake of simplicity. - The output
signal switch circuit 108 switches theaudio signals audio output terminal 112. - When the output
signal switch circuit 108 switches theaudio signal 128A having the volume level B1 to theaudio signal 126 having the volume level A1, the audiomute circuit 106 mutes theaudio signal 126 output from theaudio output terminal 112. When the outputsignal switch circuit 108 switches theaudio signal 128A having the volume level B1 to theexternal audio signal 124 having the volume level A1, the audiomute circuit 106 mutes theexternal audio signal 124 output from theaudio output terminal 112. - When the output
signal switch circuit 108 switches theaudio signal 128B having the volume level C1 to theaudio signal 126 having the volume level A1, the audiomute circuit 106 mutes theaudio signal 126 output from theaudio output terminal 112. When the outputsignal switch circuit 108 switches theaudio signal 128B having the volume level C1 to theexternal audio signal 124 having the volume level A1, the audiomute circuit 106 mutes theexternal audio signal 124 output from theaudio output terminal 112. - When the output
signal switch circuit 108 switches theaudio signal 130 having the volume level D1 to theaudio signal 126 having the volume level A1, the audiomute circuit 106 mutes theaudio signal 126 output from theaudio output terminal 112. When the outputsignal switch circuit 108 switches theaudio signal 130 having the volume level D1 to theexternal audio signal 124 having the volume level A1, the audiomute circuit 106 mutes theexternal audio signal 124 output from theaudio output terminal 112. Thesystem control section 109 controls operations of the entire audio and video recording andreproduction apparatus 100 including the outputsignal switch circuit 108 and the mediumrecording reproduction circuit 107. - As described above, when the output
signal switch circuit 108 switches theaudio signal 128A (B1), theaudio signal 128B (C1) or the audio signal 130 (D1) to the audio signal 126 (A1) or the external audio signal 124 (A1), the audiomute circuit 106 mutes theaudio signal 126 or theexternal audio signal 124 output from theaudio output terminal 112. - Conversely, when the output
signal switch circuit 108 switches the audio signal 126 (A1) or the external audio signal 124 (A1) to theaudio signal 128A (B1), theaudio signal 128B (C1) or the audio signal 130 (D1), the audiomute circuit 106 mutes theaudio signal 128A (B1), 128B (C1) or 130 (D1) output from theaudio output terminal 112. - FIG. 2 shows the relationship between an average volume level output from the audio and video recording and reproduction apparatus100 (FIG. 1), an input medium and an operation mode thereof.
- As shown in FIG. 2 and also described above, the input media used for the audio and video recording and
reproduction apparatus 100 include the audio and video recording and reproduction medium 121 (e.g., DVD-Recording medium), the first audio and video reproduction-only medium 122A (e.g., DVD-Video medium), the second audio and video reproduction-only medium 122B (e.g., V-CD medium), and the audio reproduction-only medium 123 (e.g., CD-A medium). Operation modes of the audio and video recording andreproduction apparatus 100 include astop mode 141, areproduction mode 142 and arecording mode 143. Thestop mode 141 includes afirst stop mode 145 and asecond stop mode 144. - As shown in FIG. 2, when the input medium is the audio and video recording and
reproduction medium 121, the audio and video recording andreproduction apparatus 100 outputs an audio signal having a volume level A1 in any of thestop mode 141, thereproduction mode 142 and therecording mode 143 as described below. In thestop mode 141 and therecording mode 143, the audio and video recording andreproduction apparatus 100 outputs the external video signal 124 (A1) which is input to theaudio input terminal 110. Theexternal video signal 124 can be, for example, an audio signal from a TV. In thereproduction mode 142, the audio and video recording andreproduction apparatus 100 outputs the audio signal 126 (A1) reproduced from the audio and video recording andreproduction medium 121. - When the input medium is the first audio and video reproduction-only medium122A and the operation mode is the
reproduction mode 142, the audio and video recording andreproduction apparatus 100 outputs theaudio signal 128A (B1) reproduced from the first audio and video reproduction-only medium 122A. When the input medium is the second audio and video reproduction-only medium 122B and the operation mode is thereproduction mode 142, the audio and video recording andreproduction apparatus 100 outputs theaudio signal 128B (C1) reproduced from the first audio and video reproduction-only medium 122B. When the input medium is the audio reproduction-only medium 123 and the operation mode is thereproduction mode 142, the audio and video recording andreproduction apparatus 100 outputs the audio signal 130 (D1) reproduced from the audio reproduction-only medium 123. - When the input medium is the first audio and video reproduction-only medium122A, the second audio and video reproduction-only medium 122B or the audio reproduction-only medium 123, and the operation mode is the
first stop mode 145, the audio mute circuit 106 (FIG. 1) mutes the external audio signal 124 (A1) output from the audio output terminal 112 (FIG. 1). In thesecond stop mode 144, the audio and video recording andreproduction apparatus 100 outputs the external audio signal 124 (A1). - FIG. 3 is a timing diagram illustrating an operation performed by the audio and video recording and
reproduction apparatus 100 when thereproduction mode 142 is switched to thestop mode 141 while the input medium is the audio reproduction-only medium 123 (e.g., CD-A). - At time t1, the audio and video recording and
reproduction apparatus 100 starts reproduction of the audio reproduction-only medium 123. Theoutput switch circuit 108 outputs the audio signal 130 (D1) reproduced from the audio reproduction-only medium 123. Theoutput switch circuit 108 outputs the still picture signal 131, which is output from the still picturereproduction circuit 105, through thevideo output terminal 113. - At time t2, the
reproduction mode 142 is switched to thefirst stop mode 145. Theoutput switch circuit 108 switches the audio signal to be output through theaudio output terminal 112 from the audio signal 130 (D1) to the external audio signal 124 (A1). The audiomute circuit 106 mutes theexternal audio signal 124. Theoutput switch circuit 108 continuously outputs the still picture signal 131 from thevideo output terminal 113. - At time t3, the
first stop mode 145 is switched to thereproduction mode 142. The audio and video recording andreproduction apparatus 100 resumes reproduction of the audio reproduction-only medium 123. Theoutput switch circuit 108 outputs the audio signal 130 (D1) from theaudio output terminal 112. Theoutput switch circuit 108 continuously outputs the still picture signal 131 from thevideo output terminal 113. - At time t4, the
reproduction mode 142 is again switched to thefirst stop mode 145. Theoutput switch circuit 108 switches the audio signal to be output through theaudio output terminal 112 from the audio signal 130 (D1) to the external audio signal 124 (A1). The audiomute circuit 106 mutes theexternal audio signal 124. Theoutput switch circuit 108 continuously outputs the still picture signal 131 from thevideo output terminal 113. - At time t5, the audio
mute circuit 106 releases the mute setting of the external audio signal 124 (A1). Theoutput switch circuit 108 outputs the external audio signal 124 (A1) released from the muted state. Theoutput switch circuit 108 outputs theexternal video signal 125 which is input to the video input terminal 111 (FIG. 1). - As described above, when the audio signal to be output through the
audio output terminal 112 is switched from the audio signal 130 (D1) reproduced from the audio reproduction-only medium 123 (CD-A) to the external audio signal 124 (A1) (time t2 and t4), the external audio signal 124 (A1) is muted. - Therefore, even when the average volume level D1 of the
audio signal 130 output in thereproduction mode 142 and the average volume level A1 of theexternal audio signal 124 output in thestop mode 141 are significantly different from each other, a significantly different volume of audio signal is prevented from being output when thereproduction mode 142 is switched to thestop mode 141. Thus, the user does not feel disturbed. - FIG. 4 is a timing diagram illustrating an operation performed by the audio and video recording and
reproduction apparatus 100 when thereproduction mode 142 is switched to thestop mode 141 while the input medium is the first audio and video reproduction-only medium 122A (e.g., DVD-Video) or the second audio and video reproduction-only medium 122B (e.g., V-CD). - At time t6, the audio and video recording and
reproduction apparatus 100 starts reproduction of the first audio and video reproduction-only medium 122A or the second audio and video reproduction-only medium 122B. Theoutput switch circuit 108 outputs thevideo signal 129A reproduced from the first audio and video reproduction-only medium 122A or thevideo signal 129B reproduced from second audio and video reproduction-only medium 122B through the video output terminal 113 (FIG. 1). Theoutput switch circuit 108 outputs theaudio signal 128A (B1) reproduced from the first audio and video reproduction-only medium 122A or theaudio signal 128B (C1) reproduced from second audio and video reproduction-only medium 122B through thevideo output terminal 113. - At time t7, the
reproduction mode 142 is switched to thefirst stop mode 145. Theoutput switch circuit 108 switches the video signal to be output through thevideo output terminal 113 from thevideo signal reproduction circuit 105. Theoutput switch circuit 108 switches the audio signal to be output through theaudio output terminal 112 from theaudio signal 128A (B1) or 128B (C1) to the external audio signal 124 (A1). The audiomute circuit 106 mutes theexternal audio signal 124. - At time t8, the
first stop mode 145 is switched to thereproduction mode 142. The audio and video recording andreproduction apparatus 100 resumes reproduction of the first audio and video reproduction-only medium 122A or the second audio and video reproduction-only medium 122B. Theoutput switch circuit 108 outputs theaudio signal 128A (B1) reproduced from the first audio and video reproduction-only medium 122A or theaudio signal 128B (C1) reproduced from the second audio and video reproduction-only medium 122B. Theoutput switch circuit 108 switches the video signal to be output through thevideo output terminal 113 from the still picture signal 131 to thevideo signal 129A reproduced from the first audio and video reproduction-only medium 122A or thevideo signal 129B reproduced from the second audio and video reproduction-only medium 122B. - At time 9, the
reproduction mode 142 is again switched to thefirst stop mode 145. Theoutput switch circuit 108 switches the audio signal to be output through theaudio output terminal 112 from theaudio signal 128A (B1) or theaudio signal 128B (C1) to the external audio signal 124 (A1). The audiomute circuit 106 mutes theexternal audio signal 124. Theoutput switch circuit 108 switches the video signal to be output through thevideo output terminal 113 from thevideo signal video output terminal 113. - At time t10, the audio
mute circuit 106 releases mute of the external audio signal 124 (A1). Theoutput switch circuit 108 outputs the external audio signal 124 (A1) released from the muted state. Theoutput switch circuit 108 outputs theexternal video signal 125 which is input to the video input terminal 111 (FIG. 1). - As described above, when the audio signal to be output through the
audio output terminal 112 is switched from theaudio signal 128A (B1) reproduced from the first audio and video reproduction-only medium 122A (DVD-Video) or theaudio signal 128B (C1) reproduced from the second audio and video reproduction-only medium 122B (V-CD) to the external audio signal 124 (A1) (time t7 and t9), the external audio signal 124 (A1) is muted. - Therefore, even when the average volume level B1 of the
audio signal 128A or the average volume level C1 of theaudio signal 128B output in thereproduction mode 142 and the average volume level A1 of theexternal audio signal 124 output in thestop mode 141 are significantly different from each other, a significantly different volume of audio signal is prevented from being output when thereproduction mode 142 is switched to thestop mode 141. Thus, the user does not feel disturbed. - FIG. 5 is a timing diagram illustrating an operation performed by the audio and video recording and
reproduction apparatus 100 when a switching operation between therecording mode 143, thestop mode 141 and thereproduction mode 142 is performed while the input medium is the audio and video recording and reproduction medium 121 (DVD-Recording). - At time t11, the audio and video recording and
reproduction apparatus 100 starts recording to the audio and video recording andreproduction medium 121. Theoutput switch circuit 108 outputs theexternal video signal 125, which is input through thevideo input terminal 111, through thevideo output terminal 113. Theoutput switch circuit 108 outputs the external audio signal 124 (A1), which is input through theaudio input terminal 110, through theaudio output terminal 112. - At time t12, the
recording mode 143 is switched to thestop mode 141. The audio and video recording andreproduction apparatus 100 stops recording to the audio and video recording andreproduction medium 121. Theoutput switch circuit 108 continuously outputs theexternal video signal 125 through thevideo output terminal 113. Theoutput switch circuit 108 continuously outputs the external audio signal 124 (A1) through theaudio output terminal 112. - At time t13, the
first stop mode 141 is switched to thereproduction mode 142. The audio and video recording andreproduction apparatus 100 starts reproduction of the audio and video recording andreproduction medium 121. Theoutput switch circuit 108 outputs thevideo signal 127 reproduced from the audio and video recording andreproduction medium 121 through thevideo output terminal 113. Theoutput switch circuit 108 outputs the audio signal 126 (A1) reproduced from the audio and video recording andreproduction medium 121 through theaudio output terminal 112. - At time t14, the
reproduction mode 142 is switched to thestop mode 141. Theoutput switch circuit 108 switches the video signal to be output through thevideo output terminal 113 from thevideo signal 127 to theexternal video signal 125 which is input from thevideo input terminal 111. Theoutput switch circuit 108 outputs theexternal video signal 125 through thevideo output terminal 113. Theoutput switch circuit 108 switches the audio signal to be output through theaudio output terminal 112 from the audio signal 126 (A1) to theexternal audio signal 124 which is input from thevideo input terminal 112. Theoutput switch circuit 108 outputs theexternal audio signal 124 through theaudio output terminal 112. - As described above, when the input medium is the audio and video recording and reproduction medium121 (DVD-Recording), the average volume level output from the
audio output terminal 112 is the same (A1) in therecording mode 143, thereproduction mode 142 and thestop mode 141. Accordingly, no mute operation is performed after a switching operation between therecording mode 143, thereproduction mode 142 and thestop mode 141 is performed. - In the case where an external audio signal (for example, au audio signal from a TV tuner) and audio signal stored on various media having different volume levels (for example, the first audio and video reproduction-only medium122A (e.g., DVD-Video), the second audio and video reproduction-only medium 122B (e.g., V-CD), and the audio reproduction-only medium 123 (e.g., CD-A)) are reproduced by the same apparatus, the following problem may occur. When the external audio signal is output immediately after the reproduction of the medium is stopped, the volume is suddenly increased or decreased due to the difference in volume levels of the different audio signals. In order to solve the disturbance felt by the user when this occurs, the audio and video recording and
reproduction apparatus 100 in this example mutes the audio signal output therefrom and outputs a still picture signal as the video signal. Thus, the above-mentioned disturbance felt by the user is solved even when one type of audio signal is switched to another type of audio signal having a different volume level from the one output before. - In the above example, while the audio and video recording and
reproduction medium 121 is mounted on the audio and video recording andreproduction apparatus 100, theexternal audio signal 124 and theexternal video signal 125 are output without being processed in any way in therecording mode 143 and thestop mode 141. In this way, input signals (theexternal audio signal 124 and the external video signal 125) are monitored without being processed in any way in therecording mode 143 and thestop mode 141, although not in thereproduction mode 142. - As described above, the present invention provides an audio and video recording and reproduction apparatus usable to reproduce audio signals having different volume levels, which prevents an audio signal having a different volume level from the previously reproduced audio signal from being output, and thus prevents the user from feeling uncomfortable.
- Various other modifications will be apparent to and can be readily made by those skilled in the art without departing from the scope and spirit of this invention. Accordingly, it is not intended that the scope of the claims appended hereto be limited to the description as set forth herein, but rather that the claims be broadly construed.
Claims (14)
Priority Applications (1)
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US13/047,624 US8548306B2 (en) | 2000-06-26 | 2011-03-14 | Audio and video recording and reproduction apparatus for reproducing audio signals having different volume levels |
Applications Claiming Priority (2)
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JP2000191935A JP3659871B2 (en) | 2000-06-26 | 2000-06-26 | Audio video recording and playback device |
JP2000-191935 | 2000-06-26 |
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US13/047,624 Division US8548306B2 (en) | 2000-06-26 | 2011-03-14 | Audio and video recording and reproduction apparatus for reproducing audio signals having different volume levels |
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US20010055475A1 true US20010055475A1 (en) | 2001-12-27 |
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ID=18691140
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US13/047,624 Expired - Fee Related US8548306B2 (en) | 2000-06-26 | 2011-03-14 | Audio and video recording and reproduction apparatus for reproducing audio signals having different volume levels |
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US13/047,624 Expired - Fee Related US8548306B2 (en) | 2000-06-26 | 2011-03-14 | Audio and video recording and reproduction apparatus for reproducing audio signals having different volume levels |
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EP (1) | EP1175093B1 (en) |
JP (1) | JP3659871B2 (en) |
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DE (1) | DE60109532T2 (en) |
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CN105225678A (en) * | 2014-06-19 | 2016-01-06 | 宁波音王电声股份有限公司 | A kind of audio frequency and video switching control |
CN105719673A (en) * | 2016-01-25 | 2016-06-29 | 努比亚技术有限公司 | Terminal and recording processing method thereof |
KR20240042792A (en) * | 2022-09-26 | 2024-04-02 | 삼성전자주식회사 | Electronic apparatus outputting audio and control method thereof |
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US20110164763A1 (en) | 2011-07-07 |
DE60109532T2 (en) | 2005-07-28 |
EP1175093B1 (en) | 2005-03-23 |
DE60109532D1 (en) | 2005-04-28 |
EP1175093A3 (en) | 2003-07-16 |
KR100432601B1 (en) | 2004-05-24 |
JP2002010198A (en) | 2002-01-11 |
EP1175093A2 (en) | 2002-01-23 |
US8548306B2 (en) | 2013-10-01 |
KR20020000727A (en) | 2002-01-05 |
TWI244640B (en) | 2005-12-01 |
JP3659871B2 (en) | 2005-06-15 |
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Owner name: PANASONIC CORPORATION, JAPAN Free format text: CHANGE OF NAME;ASSIGNOR:MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;REEL/FRAME:021897/0624 Effective date: 20081001 Owner name: PANASONIC CORPORATION,JAPAN Free format text: CHANGE OF NAME;ASSIGNOR:MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;REEL/FRAME:021897/0624 Effective date: 20081001 |
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