KR100546229B1 - Video audio signal recording and reproducing apparatus and method - Google Patents

Abstract

Audio signals and video signals are recorded on the hard disk. In a hard disk, these are performed in parallel by time-division processing of recording and reproduction. One field of video data corresponding to four fields of audio data is recorded in one set and recorded in time series. In single-speed reproduction, data is reproduced every pair. Video data is played back repeatedly for four fields. In double-speed playback, every other video data is reproduced, and at the same time, four fields of audio data corresponding to the reproduced video data and four subsequent fields of audio data are reproduced. In order to reproduce eight fields of audio data during four fields, the speed of the audio data is converted to twice and the audio data is continuously reproduced.

Description

Video audio signal recording and reproducing apparatus and method

The present invention relates to a video and audio signal recording and reproducing apparatus and method capable of reading all audio signals from a recording medium even when double speed reproduction is performed when playing back a video and audio signal recorded on a recording medium.

While enjoying television broadcasts, telephone rings ring suddenly and there are customers and often miss broadcast programs. If you miss a television program, you can't see it again except for a program that is rebroadcast. Programs that are rebroadcasted within a short period of time are rare, and news and sports programs are usually not rebroadcasted. Therefore, in most cases, if a television broadcast program is missed, the program cannot be viewed again.

In addition, there are cases where a scene that you want to save while watching a broadcast program such as a scene of a movie or drama, an interview of a key person, a highlight scene of a sports program, and so on suddenly starts. In such a case, even if the VTR is immediately set, the scene may not be timed and the scene may not be recorded.

Thus, a television receiver that constantly records the program on a recording medium while watching a broadcast program is considered. In such a television receiver, even if there is a sudden ringing or a visitor, the program can be returned and played back so that the program is not missed. In addition, the program can be easily stored and coped even if the program to be recorded suddenly starts.

In addition, it is possible to use a hard disk drive as a recording medium of a television receiver which constantly records a program on the recording medium. Conventionally, magnetic tapes are widely used as recording media for recording video signals. By the way, the magnetic tape has a slow access speed and is difficult to use as a recording medium used for such a television receiver. In addition, although the use of a semiconductor memory is considered, a large-capacity semiconductor memory is extremely expensive, and in a semiconductor memory, the stored program is erased when the power supply drops, which is not suitable when the program is stored for a long time. In contrast, a hard disk drive is large in capacity and fast enough for access.

FIG. 6 shows an example of the configuration of a video-audio recording and reproducing apparatus used for a television receiver which constantly records a program on a recording medium. For example, a video signal obtained based on received television broadcast (real-time broadcast) radio waves is supplied to the terminal 200, and an audio signal is supplied to the terminal 201. The video signal supplied to the terminal 200 is digitized by the A / D conversion circuit 202, and the video compression circuit 203 performs extraction, compression encoding, or the like. In this example, the extraction rate is 1/4. Video data output from the image compression circuit 203 is temporarily stored in the buffer memory 204.

In this manner, the audio signal supplied to the terminal 201 is digitized by the A / D conversion circuit 208 and compressed and encoded by the speech compression circuit 209. No extraction in field units is performed on the audio signal. Audio data output from the voice compression circuit 209 is temporarily stored in the buffer memory 210.

Based on the control of the recording / playback controller 207, video data and audio data temporarily stored in the buffer memories 204 and 210 are read out and recorded to the hard disk drive 206 via the bus 205.

Video data and audio data recorded on the hard disk drive 206 are read out based on the control of the recording / playback controller 207. Video data is temporarily stored in the buffer memory 211, and audio data is temporarily stored in the buffer memory 216.

The video data read out from the buffer memory 211 is decompressed by the image decompression circuit 212 and analogized by the D / A conversion circuit 213. The video signal output from the D / A conversion circuit 213 is supplied to the terminal 214A of the switch circuit 214. In this way, the audio data read out from the buffer memory 216 is decompressed by the speech decompression circuit 217 and analogized by the D / A conversion circuit 218. The audio signal output from the D / A conversion circuit 218 is supplied to the terminal 219A of the switch circuit 219.

The video signal is supplied from the input terminal 200 to the terminal 214B of the switch circuit 214, and the audio signal is supplied from the input terminal 201 to the terminal 219B of the switch circuit 219. Both of these switch circuits 214 and 219 are controlled to be switched by the recording / reproduction controller 207, and reproduced signals read from the hard disk drive 206 and signals by real-time broadcasting supplied from the input terminals 200 and 201. The signal is selectively switched. The outputs of the switch circuits 214 and 219 are discharged to the output stages 215 and 220, respectively, and reproduced by the CRT monitor device or the speaker.

By the way, recording of data to the hard disk drive 206 is performed in units of one set of data in which video data for one field and audio data corresponding to four consecutive fields at the head of the video data are combined. . 7 shows an example of a set of data consisting of this audio data and video data. Audio data for four consecutive fields is stored at the beginning, and corresponding video data is stored for one field. This one set of data is arranged successively in time series with respect to the address of the hard disk drive 206, respectively.

Recording and reading of data in the hard disk drive 206 are performed as follows. 8 shows an example of a disk access method at 1x reproduction. As shown in Figs. 8A and 8B, video and audio signals are supplied to the terminals 200 and 201, respectively. Each paragraph corresponds to one field. The supplied video and audio signals are converted into video data and audio data through the above-described predetermined processing, and the video data is recorded in the buffer memory 204, and the audio data is recorded in the buffer memory 210.

When the time for four fields to the signals a ₀ to a ₃ elapses, as shown in FIG. 8C, the first four fields of voice signals b ₀ to b ₃ of the input voice signal are compressed. Encoded audio data (collectively referred to as audio data e ₀ ) is recorded in a predetermined area of the disc 206 so that the signals a ₀ to a ₃ of the input video signal of four fields corresponding to subsequent addresses are recorded. Video data a ₀ based on the first one field in the period is recorded. As a result, one set of data consisting of audio data and video data is recorded.

In this manner, recording of the next set of data is performed by waiting the passage of four fields for the signals a ₄ to a ₇ . In this example, recording of the next set of data is continued following the address of the video data a ₀ .

When the terminals 214B and 219B are selected in the switch circuits 214 and 219, respectively, only video and audio signals by real time broadcasting are discharged to the output terminals 215 and 220 and reproduced by the monitor device or the speaker. The video outputs a ₀ to a ₆ and the corresponding audio signals b ₀ to b ₆ correspond to this with the monitor output of FIG. 8G.

Next, reading of data from the hard disk drive 206 will be described. First, the case of reproduction at 1x speed, that is, reproduction at normal speed will be described. When 1x reproduction is designated, reading of data from the hard disk drive 206 is started. It is assumed here that playback at the time point at which the predetermined time t ₀ is returned is specified. The address on which the corresponding data is recorded on the address of the hard disk drive 206 is accessed.

In the beginning, switch terminals 214 and 219 select terminals 214B and 219B, respectively.

Reading from the hard disk drive 206 takes into account the time required for disk access. In this example, as shown in Fig. 8D, a time t is provided between writing and reading. Also, this time t does not have to be the same between each write and read. Audio data is first read and written to the buffer memory 216, and then video data is read and written to the buffer memory 211.

For example, first as shown in FIG. 8D, audio data f ₀ is read and written to the buffer memory 216. Subsequently, video data c ₀ is read and written to the buffer memory 211. Data is read from the buffer memories 211 and 216 in synchronization with the next field after this writing is completed.

The video data c ₀ read out from the buffer memory 211 is supplied to the image decompression circuit 212 to decompress and decompress in real time. Reading and decompression of the video data c ₀ from this buffer memory 211 is repeatedly performed for four fields for each field. For this reason, as shown in FIG. 8E, for example, video data c ₀ is repeated for four fields, and then video data c ₄ is repeated for four fields. The expanded video data c ₀ becomes an analog video signal through the D / A conversion circuit 213 and is supplied to the input terminal 214A of the switch circuit 214.

The reading of the audio data f ₀ from the buffer memory 216 is performed in synchronization with the reading of the video signal. The audio data f ₀ read out from the buffer memory 216 is supplied to the speech decompression circuit 217 to decompress and decompress in real time. As a result, as shown in Fig. 8F, continuous audio data is obtained for each field. The expanded audio data f ₀ (audio data d ₀ to d ₃ ) becomes an analog audio signal through the D / A conversion circuit 218 and is supplied to the terminal 219A of the switch circuit 219.

In synchronization with the start of the decompression operation of the video decompression circuit 212 or the audio decompression circuit 217, the terminal 214A and the terminal in the switch circuits 214 and 219 based on the control of the recording / reproducing controller 207. 219A are each selected. As a result, the hard disk drive 206 has already been used in the past instead of the real-time broadcast video and audio signals supplied from the input terminals 200 and 201 to the terminals 214B and 219B of the switch circuits 214 and 219, respectively. Video signals and audio signals recorded and written to the output terminals 215 and 220 are discharged to the output terminals 215 and 220 (Fig. 8G).

The recording and reading of the hard disk drive 206 are performed alternately. That is, the above-described reading of the audio data f ₀ and the video data c ₀ at the time when four fields have passed since the start of the previous recording (audio data e ₀ and video data a ₀ ) has elapsed. This is already ending. Thus, the recording of the next data (audio data e ₄ and video data a ₄ ) supplied from the inputs 200 and 201 is made by the processing as mentioned above, and the time t is terminated when recording ends. The reading of the next data (audio data f ₄ and video data c ₄ ) is waited.

9 conceptually shows data written and written to the hard disk drive 206 in this way. Data is four sets of audio data for one field and one set of video data for one field, and these sets are recorded in time series (Fig. 9A). In addition, in the case of the above described 1x speed reproduction, the reading of the data is performed by A, B, C,... As shown in the order of, data is read in turn for each pair of audio and video data according to the time series.

As described above, when the data is written and read in parallel as mentioned above, the address of past-recorded data to be read and the address to which new data is written may be separated. For example, these addresses may fall off the innermost and outermost peripheries of the disc. In this case, when transitioning from recording to reading, and also from reading to writing, it takes time to seek the disc and wait for rotation. The time t provided between the above-described recording and reading is to secure the seek time of the disc and the wait time for rotation.

Next, double speed reproduction will be described. Fig. 10 shows an example of a disk access method at this double speed reproduction. Naturally, even in the case of double speed reproduction, the recording of data to the hard disk drive 206 is performed in the same manner as in the case of the above described double speed reproduction, as shown in Fig. 10C, and thus the description thereof is omitted here. Of course, the supply of the input video signal and the input audio signal is also exactly the same as in the case of single-speed reproduction, as shown in Figs. 10A and 10B.

In the case of double speed reproduction, data read from the hard disk drive 206 is read every other pair of data consisting of four fields of audio data and one field of video data. That is, as shown in the example of FIG. 10D, when a set of data consisting of audio data f ₀ and video data c ₀ is read, audio data f ₄ and video data next located in time series are read. One set of (c ₄ ) is skipped, and the next set of audio data f ₈ and video data c ₈ positioned next is read out. In the example of FIG. 9, as shown in FIG. 9C, every other pair of data is read in order of A, B, and C in order.

In this way, the output based on every other data read out is shown to FIG. 10E and 10F. As shown in Fig. 10E, the data c _{0 for} one field is repeated for four fields, the data c ₈ is repeated for four fields, and double-speed reproduction is realized.

By the way, as shown in Fig. 10F, the data d ₈ to d ₁₁ are outputted after the data d ₀ to d _{3 for} four fields are continuously output. That is, the data d ₈ before four fields is output after the data d ₃ . Therefore, the continuity of the audio signal is not maintained in the portion of the skipped pair of data. For this reason, there has been a problem that noise must be made while performing double speed reproduction.

1 is a schematic diagram showing an embodiment of the present invention.

2 is a schematic diagram illustrating an example of a configuration of a remote commander for operating a television receiver.

3 is a block diagram showing an example of the configuration of a television receiver to which the present invention is applied;

4A to 4C are conceptual views illustrating reading of data at double speed reproduction.

5A to 5G are schematic diagrams showing an example of a disk access method during double speed playback.

Fig. 6 is a block diagram showing an example of the configuration of a video and audio recording and reproducing apparatus used for a television receiver in which a program is continuously recorded on a recording medium.

7 is a schematic diagram illustrating an example of a set of data consisting of audio data and video data.

8A to 8G are schematic diagrams showing an example of a disk access method at single speed playback.

9A to 9C are conceptual diagrams showing data written and written to a hard disk drive.

10A to 10G are schematic diagrams showing an example of a disk access method at double speed playback.

Therefore, an object of the present invention is to continuously record audio and video signals by real-time broadcasting, for example, on a recording medium, and to read and reproduce signals recorded in parallel with the recording. The present invention provides a sustained video and audio signal recording and reproducing apparatus and method.

The present invention provides a recording medium for recording an audio signal and a video signal, in order to solve the above problems;

Recording medium control means for controlling to perform recording on the recording medium and reproduction from the recording medium in parallel;

Further, the recording medium control means records the audio signal and the video signal of a predetermined period as a pair, reproduces (n-1) every other audio signal and the video signal, and at the same time continues the audio signal to be reproduced. A video and audio recording and reproducing apparatus, characterized in that the control is performed to reproduce an audio signal.

The present invention also provides a method of recording audio and video signals on a recording medium,

A recording medium control step of controlling to perform recording on the recording medium and reproduction from the recording medium in parallel,

Furthermore, in the recording medium control step, the audio signal and the video signal of a predetermined period are recorded as one pair, and the audio signal and the video signal are reproduced every other pair of (n-1) and the audio signal to be reproduced at the same time is continued for a predetermined period. A video and audio recording and reproducing method characterized by controlling to reproduce an audio signal as well.

As described above, the present invention reproduces every (n-1) video signals of a predetermined period at the time of reproduction, while an audio signal is reproduced in correspondence with the video signal to be read and of a predetermined period following the audio signal. Audio signals are also reproduced. As a result, the sound can be reproduced n times without interruption.

Best Mode of the Invention

An embodiment of the present invention will be described below with reference to the drawings.

1 illustrates an embodiment of the present invention. In FIG. 1, 1 is a television receiver to which the present invention is applied, and 2 is a remote commander for operating the television receiver 1. An image is output to the screen 3. The hard disk drive unit 4 is incorporated in the television receiver 1. The program being received by the television receiver 1 is always recorded in this hard disk unit 4. In such a television receiver provided with the hard disk drive unit 4, it is possible to play back a missed scene or a scene to be watched again or to record and play a desired program.

FIG. 2 shows an example of the configuration of the remote commander 2 to operate such a television receiver 1. The remote commander 2 has various keys for basic setting of the television receiver 1, that is, a power switch 11 for turning on / off the power of the television receiver 1, and a channel key 12 for channel setting. , 12, 12, ...), channel up / down keys 13A and 13B, volume up / down keys 14A and 14B, and input source selector switch 15 are arranged.

Furthermore, the remote commander 2 for operating the television receiver 1 to which the present invention is applied has a program pause key 16 and a book mark as various keys for controlling the hard disk drive unit 4 of the television receiver 1. Record key 17, section repeat key 18, cancel key 19, reverse skip replay key 20, reverse fast feed key 21, double speed key 22, forward rotation fast feed key 23 The forward rotation skip key 24, the outline search key 25, the arrow keys 26A and 26B, and the determination key 27 are arranged in an array.

When the program pause key 16 is pressed, the screen being received is stopped there and displayed as a still screen. In the meantime, the program is recorded in the hard disk drive section 4 of the television receiver 1. When the program pause key 16 is pressed again, the program recorded in the hard disk drive unit 4 is reproduced in the scene where the still picture is displayed.

When the book mark recording key 17 is pressed, the program being broadcast at this time can be stored in the hard disk drive unit 4 of the television receiver 1.

Repeat playback is set by the interval repeat key 18. When the section repeat key 18 is first pressed, the start position of the repeat is set, and when the section repeat key 18 is pressed again, the end position of the repeat is set.

The cancel key 19 is pressed when canceling the set operation or function.

The reverse skip regeneration key 20, the reverse fast transfer key 21, the double-speed key 22, the forward rotation fast feed key 23, and the forward rotation skip key 24 are keys for shift reproduction. If the double speed key 22 is pressed during playback of the program recorded in the hard disk drive section 4, the program is reproduced at double speed. Press again to resume playback at normal speed. While the forward rotation high speed feed key 23 is pressed, more high speed reproduction is achieved. When the forward rotation skip key 24 is pressed, the playback video is skipped. In addition, reverse regeneration is performed at high speed while the reverse fast transfer key 21 is pressed. When the reverse skip playback key 20 is pressed, the playback video is skipped in the reverse direction.

The outline search key 25, arrow keys 26A and 26B, and decision key 27 are used for program search. When the outline search key 25 is pressed, the screen 3 of the television receiver 1 is divided into a center screen and a plurality of small screens around it. In the surrounding small screens, screens for every predetermined time are displayed among the screens recorded on the hard disk drive. By operation of the arrow keys 26A and 26B, a desired screen is selected from the plurality of screens, and when the scene to be viewed is found, the decision key 27 is pressed. When the decision key 27 is pressed, playback starts from the selected screen.

3 shows an example of the configuration of a television receiver 1 to which the present invention is applied. In FIG. 3, the received signal received by the antenna 51 is supplied to the tuner circuit 52. The tuner circuit 52 is supplied with a channel setting signal from the system controller 50. Based on this channel setting signal in the tuner circuit 52, a signal of a desired receiving channel is selected, and this signal is converted into an intermediate frequency signal.

The output of the tuner circuit 52 is supplied to the image intermediate frequency circuit 53. In the image intermediate frequency circuit 53, the intermediate frequency signal from the tuner circuit 52 is amplified and the signal is video detected. As a result, for example, an NTSC composite video signal is obtained. This video signal is supplied to one input terminal 55A of the video source switching switch 55. In addition, an audio signal is detected from, for example, a 4.5 MHz bit component of the output of the intermediate frequency circuit 53. This output is supplied to the audio demodulation circuit 62.

The other input terminal 55B of the video source changeover switch 55 is supplied with a video signal from the external video input terminal 56. The video signal source switch 55 is supplied with a selection signal from the system controller 50. The video signal based on the television broadcast received by the video source changeover switch 55 and the video signal from the external video input terminal 56 are switched.

The output of the video source changeover switch 55 is supplied to the video signal processing circuit 57. By the video signal processing circuit 57, the luminance signal Y and the color signal C are separated from the NTSC composite video signal, and the color difference signals U and V are demodulated from the color signal C. Video signals Y, U, and V are formed. These component video signals Y, U, and V are supplied to the terminal 58A of the switch circuit 58 and to the A / D converter 71 at the same time. The output of the D / A converter 85 is supplied to the other input terminal 58B of the switch circuit 58.

The switch circuit 58 reproduces a screen based on a video signal received from a television broadcast or an external video input terminal 56, and playback from the hard disk drive 80 (corresponding to the hard disk drive section 4). To switch the screen. The switch circuit 58 is controlled by the recording / reproducing controller 77. That is, the control signal from the recording / reproducing controller 77 is supplied to the switch circuit 58 via the system controller 50. When outputting a video image based on a video signal received from a television broadcast or an external video input terminal 56, the switch circuit 58 is switched to the terminal 58A side. When outputting a playback screen from the hard disk drive 80, the switch circuit 58 is switched to the terminal 58B side.

The output of the switch circuit 58 is supplied to the video output circuit 59. The video output circuit 59 is a matrix circuit for forming three primary color signals R, G, and B from the component video signals Y, U, and V from the switch circuit 58, and the three primary color signals R, G. , B) and an image amplifying circuit for supplying to the color receiver tube 61. In the image output circuit 59, the component video signals Y, U and V from the switch circuit 58 are converted into three primary color signals R, G and B and supplied to the color image tube 61.

In addition, an audio signal detected from a bit component of, for example, 4.5 MHz of the output of the intermediate frequency circuit 53 is supplied to the audio demodulation circuit 62. In the voice demodulation circuit 62, the audio signal is demodulated. This audio signal is supplied to the input terminal 63A of the audio source changeover switch 63.

The audio signal from the external audio input terminal 64 is supplied to the other terminal 63B of the audio source changeover switch 63. The audio signal based on the television broadcast received by the audio source changeover switch 63 and the audio signal from the external audio input terminal 64 are selected.

The output of the audio source changeover switch 63 is supplied to the terminal 65A of the switch circuit 65 and to the A / D converter 75 at the same time. The output of the D / A converter 87 is supplied to the other input terminal 65B of the switch circuit 65.

The switch circuit 65 switches the audio signal from the received television broadcast or external audio input terminal 64 with the audio signal reproduced from the hard disk drive 80. The switch circuit 65 is controlled by the recording / reproducing controller 77. That is, the control signal from the recording / reproducing controller 77 is supplied to the switch circuit 65 via the system controller 50. When outputting the received television broadcast or the audio signal from the external audio input terminal 64, the switch circuit 65 is switched to the terminal 65A side. When outputting an audio signal from the hard disk drive 80, the switch circuit 65 is switched to the terminal 65B side.

The output of the switch circuit 65 is supplied to the audio amplifier 66. In the audio amplifier 66, the audio signal from the switch circuit 65 is amplified. This audio signal is supplied to the speaker 67.

The component video signals Y, U, and V from the video signal processing circuit 57 are supplied to the A / D converter 71. In the A / D converter 71, the component video signal from the video signal processing circuit 57 is digitized. The output of the A / D converter 71 is supplied to the field memory 72. In this embodiment, video data is extracted at an extraction rate of 1/4. Therefore, video data is recorded in the field memory 72 every four fields.

The output of the field memory 72 is supplied to the image compression circuit 73. In the image compression circuit 73 this component video signal is compressed. As an image compression method, for example, motion JPEG is used. The video data compressed by the image compression circuit 73 is temporarily recorded in the buffer memory 74 made of, for example, FIFOs (First In, First Out).

The audio signal from the audio source switching circuit 63 is supplied to the A / D converter 75. In the A / D converter 75, the audio signal from the audio source switching circuit 63 is digitized. The output of the A / D converter 75 is supplied to the voice compression circuit 76. The audio signal is compressed in the voice compression circuit 76. As the voice compression method, for example, a nonlinear PCM is used. The audio signal compressed by the voice compression circuit 76 is temporarily recorded in a buffer memory 95 made of, for example, a FIFO.

Video data and audio data are read from the buffer memories 74 and 95 based on the control of the recording / playback controller 77. These read data are written to the hard disk drive 80 via the bus 78.

As described above with reference to Fig. 7, the recording of data on the hard disk drive 80 includes extracted video data for one field and audio data corresponding to four consecutive fields at the beginning of the video data. It consists of a set of data combined as a unit. Audio data for four consecutive fields is stored at the beginning, and corresponding video data is stored for one field. With respect to the address of the hard disk drive 80, this one set of data is arranged successively in time series.

Video data and audio data recorded in the hard disk drive 80 are reproduced on the basis of the control of the recording / playback controller 77. Audio data read and reproduced from the hard disk drive 80 is temporarily recorded in the buffer memory 96 made of, for example, FIFO via the bus 78. In this manner, video data read and reproduced from the hard disk drive 80 is temporarily recorded in the buffer memory 81 made of, for example, FIFO via the bus 78.

Video data is read from the buffer memory 81 based on the control of the recording / playback controller 77. Since video data is extracted at an extraction rate of 1/4, the same data is repeatedly read from the buffer memory 81 for four fields. The read video data is supplied to the image stretching circuit 82. In the image decompression circuit 82, component video data (Y, U, V) is formed from video data compressed in, for example, Motion JPEG. The output of the image expansion circuit 82 is supplied to the D / A converter 85 through the image processing circuit 83 and the field memory 84 for forming a multi-screen. In the D / A converter 85, the digital video signal is converted into an analog video signal. The output of this D / A converter 85 is supplied to the terminal 58B of the switch circuit 58.

In addition, audio data is read from the buffer memory 96 based on the control of the recording / reproducing controller 77. The read audio data is supplied to the speech decompression / speed conversion circuit 86. The output of the speech decompression / speed conversion circuit 86 is supplied to the D / A converter 87. The digital audio signal is converted into an analog audio signal by the D / A converter 87. The output of this D / A converter 87 is supplied to the terminal 65B of the switch circuit 65.

The system controller 50 controls the entire television receiver 1. The system controller 50 and the recording / playback processing controller 77 are connected in both directions.

The system controller 50 is given an input from the remote commander 2 via the light receiving unit 92. Various operations are set based on the input from this remote commander 2. The output of the system controller 50 is supplied to the display generating circuit 94. The display generator 94 generates display signals indicative of various operation setting states. The output of this display generating circuit 94 is supplied to the video output circuit 59 so that various operation states are displayed on the screen.

Next, a description will be given of an access method for the hard disk drive 80 when performing double speed playback according to the present invention. Incidentally, writing and reading at 1x speed are omitted because they are completely the same as the method described above with reference to FIG.

In the present invention, when performing double speed playback, reading is performed with one set of four fields of audio data, video data following this audio data, and four fields of audio data following this video data.

Fig. 4 conceptually shows the reading of data during this double speed reproduction. As is also shown an example in 4a, the one subsequent to the audio data, (f ₀₎ of the four field-minute continuous in the hard disk drive 80 corresponding to the audio data, (f ₀₎ 1 field minute video data ( c ₀ ) is placed, and audio data f _{4 for} the next four fields is disposed following this video data c ₀ , and further, video corresponding to this audio data f ₄ subsequent to this audio data. Data c ₄ is placed. Similarly, one set of data each consisting of four fields of audio data and one field of corresponding video data is arranged in succession in time series. At the time of reproduction at 1x speed, as shown in Fig. 4B, data is continuously read in sequence as A, B, C, ... in units of one pair.

In double-speed playback, as shown in Fig. 4C, for example, the next set of audio data f ₄ is read out following the one set of data consisting of audio data f ₀ and video data c ₀ . At the next reading, the video data c ₄ paired with the audio data f ₄ is skipped, and the next set of data, that is, the audio data f ₈ and the video data c ₈ , is read out. Subsequently, the next set of audio data f ₁₂ is read. As described above, in the present invention, the video data is filtered out every other time, such as A ', B', C ', ..., at double speed reproduction, and audio data is continuously read.

Fig. 5 shows an example of the disk access method at this double speed reproduction. Naturally, the supply of the input video signal and the input audio signal is made exactly the same as in the case of 1x reproduction as shown in Figs. 5A and 5B.

Recording and reading of data to the hard disk drive 80 during double speed reproduction are performed as follows. As shown in Figs. 5A and 5B, video and audio signals are supplied to the A / D conversion circuits 71 and 75, respectively. Each paragraph corresponds to one field. The supplied video and audio signals are converted into video data and audio data through the above-described predetermined processing so that video data is recorded in the buffer memory 74 and audio data is recorded in the buffer memory 95.

When the time for four fields to the signals a ₀ to a ₃ elapses, as shown in FIG. 5C, the voice signals b ₀ to b _{3 for} the first four fields of the input voice signal are compressed. Encoded audio data (collectively referred to as audio data e ₀ ) is recorded in a predetermined area of the disc 80 so that the signals a ₀ to a ₃ of the input video signal of four fields corresponding to subsequent addresses are recorded. Video data a ₀ based on the first one field in the period is recorded. As a result, one set of data consisting of audio data and video data is recorded.

In this way, the next recording of one set of data is waited for the elapse of four fields for the signals a ₄ to a ₇ . In this example, the next set of data is recorded following the address of the video data a ₀ .

When the terminals 58A and 65A are selected in the switch circuits 58 and 65, respectively, video and audio signals by real-time broadcasting are output to the color receiver tube 61 and the speaker 67. The video outputs a ₀ to a ₆ and the corresponding audio signals b ₀ to b ₆ correspond to this with the monitor output of FIG. 5G.

Next, reading of data from the hard disk drive 80 will be described. For example, double speed reproduction is designated by pressing the double speed key 22 of the remote commander 2. In this example, it is assumed that data from the position returned by the time t ₀ at the position shown at the viewpoint A in FIG. 5 is reproduced at twice the speed.

An instruction for double speed reproduction is supplied to the recording / reproduction controller 77 via the system controller 50, and reading of data from the hard disk drive 80 is started. The address on which the corresponding data is recorded on the address of the hard disk drive 80, that is, the address on which the recording is performed at a time returned by the time t ₀ is accessed.

Reading from the hard disk drive 80 takes into account the time required for disk access. In this example, as shown in Fig. 5D, a time t is provided between writing and reading. Also, this time t does not have to be the same between each write and read. The read audio data and video data are written to the buffer memories 96 and 81, respectively.

For example, in the example shown in FIG. 5D, audio data f ₀ is first read and written to the buffer memory 96. Subsequently, video data c ₀ is read and written to the buffer memory 81. Following the reading of this video data c ₀ , the next set of audio data f ₄ is also read. The read audio data f ₄ is recorded in the buffer memory 96. On the other hand, the video data c ₀ is read from the buffer memory 81 in synchronization with the field after the recording of the video data to the buffer memory 81 ends.

Further, in the above double speed reading, the access time to the disc is longer by the minute of the audio data f ₄ which is read after the video data c ₀ as compared with the case of the above double speed. However, since the audio data is sufficiently small in size compared to the video data, there is no problem regarding securing the time t required for disk access.

The video data c ₀ read out from the buffer memory 81 is supplied to the image decompression circuit 82 to decompress and decompress in real time. Reading and decompression of the video data c ₀ from this buffer memory 81 is performed repeatedly for four fields for each field. As a result, for example, as shown in FIG. 5E, the video data c ₀ is repeated for four fields. The decompressed video data c ₀ is supplied to the D / A conversion circuit 85 through the screen processing circuit 83. The video data c ₀ is supplied to the terminal 58B of the switch circuit 58 as an analog video signal by the D / A conversion circuit 85.

Reading of audio data f ₀ and f ₄ from the buffer memory 96 is performed in synchronization with the video signal. The audio data f ₀ and f ₄ read out from the buffer memory 96 are supplied to the speech decompression / speed conversion circuit 86, which decompresses and decompresses and decompresses in real time.

In the case of double-speed reproduction, audio data is eight fields of audio data f ₀ and f ₄ , whereas video data c ₀ is repeatedly read for four fields. Thus, fire rate conversion is performed to reproduce these eight fields of audio data f ₀ and f ₄ in four fields. The speech decompression / speed conversion circuit 86 is constituted by, for example, a DSP (Digital Signal Processor), and the speech rate conversion is performed by performing extraction and filtering processing of 1/2 in a sampling unit on the supplied audio data.

The audio data f ₀ and f ₄ converted and decompressed are converted into analog audio signals through the D / A conversion circuit 87 and supplied to the terminal 65B of the switch circuit 65. As a result, an audio signal obtained by continuously injecting two fields of data into one field is obtained. That is, as shown in FIG. 5F, the audio signals d ₀ to d ₃ corresponding to the video signal c ₀ and the audio signals d ₄ to d ₈ corresponding to the next video signal c _{4 are} illustrated. Is continuously obtained at twice the speed.

The terminal 58B in the switch circuits 58 and 65 based on the control of the recording / reproducing controller 77 in synchronization with the start of the decompression operation of the video decompression circuit 82 or the audio decompression / speed conversion circuit 86. And terminal 65B are selected respectively. As a result, the terminal 58A and the terminal 65A are initially selected, respectively, and the D / A conversion circuit 85 is replaced with the video signal and the audio signal by the real-time broadcasting that were respectively supplied to the switch circuits 58 and 65. And the video signal and the audio signal output from 87) are output from the switch circuits 58 and 65, respectively (FIG. 5G).

This write and read to the hard disk drive 80 is alternately performed. Video data is read out every other, and audio data is read out immediately after and immediately after the video data.

That is, at the time when four fields have passed since the start of the previous recording (audio data e ₀ and video data a ₀ ), the above-mentioned audio data f ₀ , f ₄ and video data c The reading of ₀ ) is already finished, so that the recording of the next data (audio data e ₄ and video data a ₄ ) is made by the process as mentioned above, and when the recording is finished, the time ( Waiting for t), the next data (audio data f ₈ , f ₁₂ and video data c ₈ ) is read out.

By controlling the reading at double speed in this manner, as shown in Fig. 5G, the audio signal is continuously reproduced at double speed. In other words, two fields of audio data are continuously read and reproduced in one field period. The audio data is continuous and there is no need to make noise during double speed playback.

In addition, although the present invention has been described so as to be applied to the double speed reproduction, this can be applied to the n-speed regeneration such as 3 times, 4 times, ..., without being limited to the above example. That is, at the time of reproduction, n-speed reproduction is performed by reading every (n-1) pairs of audio data and video data, and reading audio data from each of (n-1) sets of data following the one set of read data. It becomes possible. The read audio data is subjected to speech rate conversion at a rate of 1 / n, for example, by the speech decompression / rate conversion circuit 86. The value of n may preferably be determined in consideration of the continuity of the audio signal after the speech rate conversion and the timing of access to the hard disk drive 80.

As described above, according to the present invention, all audio data can be read from the hard disk drive even at double speed reproduction, and the continuity of speech is maintained. In addition, there is an effect that the sound can be output without noise even at the double speed reproduction.

Claims (6)

In a video audio recording and playback apparatus, A recording medium for recording audio signals and video signals; Recording medium control means for controlling to perform recording on the recording medium and reproduction from the recording medium in parallel; The recording medium control means records the audio signal and the video signal in one set for a predetermined period, and reproduces (n-1) the audio signal and the video signal in one pair at the same time, and reproduces the audio. An audio / video recording and reproducing apparatus, characterized in that control is performed to reproduce also the audio signal of the predetermined period following the signal. The method of claim 1, And a converting means for converting the reproduced audio signal to n-times speed. The method of claim 1, A video and audio recording and reproducing apparatus, characterized by constantly recording audio signals and video signals of a received television broadcast. In the video audio recording playback method, Recording an audio signal and a video signal on a recording medium; A recording medium control step of controlling to perform the recording on the recording medium and the reproduction from the recording medium in parallel, In the recording medium control step, recording is performed using the audio signal and the video signal of one set as a set, and the audio signal and the video signal of the set are filtered every (n-1) and simultaneously reproduced. And reproducing the audio signal of the predetermined period following the audio signal. The method of claim 4, wherein A video and audio recording and reproducing method, characterized by converting the reproduced audio signal to n-times speed. The method of claim 4, wherein A video and audio recording and reproducing apparatus, characterized by constantly recording audio signals and video signals of a received television broadcast.