JP2006014185A - Data recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly reproduce video/audio data under recording. <P>SOLUTION: This data recording/reproducing apparatus includes the steps of: receiving video/audio data (S502); performing A/D conversion to produce digital data (S504); transferring the digital data to an SDRAM (S506); reading data in the SDRAM and compressing them using an MPEG encoder (S508); transferring the compressed data to a hard disk device (S510); recording the transfer amount of the compressed data in a memory (S512); and executing reproducing processing (S600) if it is judged that data of 1.5 times of data amount in reproduction are written (YES in S514). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data recording / reproducing apparatus, and more particularly to a data recording / reproducing apparatus capable of reproducing recorded data during recording.

  In recent years, digital data recording / reproducing apparatuses have been widely used in place of analog data recording / reproducing apparatuses. This digital data recording / reproducing apparatus includes an apparatus for recording data that can be randomly accessed. Therefore, in addition to the function of a VTR (Video Tape Recorder) or other analog data recording / reproducing apparatus, it is possible to realize a function of reproducing recorded data during recording of a television program, for example.

  For example, Japanese Patent Laid-Open No. 10-322626 (Patent Document 1) uses a single recording / reproducing head to reproduce already recorded digital data while recording digital continuous data such as moving image data or audio data. Disclosed is a disk device that can be used. The disk device includes a recording buffer memory for temporarily storing digital continuous data, a reproduction buffer memory for temporarily storing digital continuous data reproduced from a disk-shaped recording medium, and data storage Control means for alternately controlling reproduction. The control means reads the digital continuous data stored in the recording buffer memory at a recording speed that is at least twice the average bit rate of the input data and records it in the recording area of the disk-shaped recording medium. Further, at the time of reproduction, the control means reproduces the digital continuous data recorded in the reproduction area at a reproduction speed at least twice the average bit rate, and writes it in the reproduction buffer memory. The control means reads out the digital continuous data stored in the reproduction buffer memory at a predetermined bit rate and outputs it to the display device while the recording / reproducing head accesses between the recording area and the reproducing area.

According to the disk device disclosed in Patent Document 1, the recording / reproducing speed of the recording medium is made faster than the bit rate at the time of recording and the bit rate at the time of reproduction plus the access time of the recording / reproducing head. Further, since the digital continuous data is temporarily stored in the reproduction buffer memory, the data can be reproduced continuously.
JP-A-10-322626

  However, for example, according to a data recording / reproducing apparatus having a function of reading and reproducing recorded data during recording of video / audio data, such as the disk device disclosed in Patent Document 1, an area to be reproduced Depending on the case, the recording position of the single recording / reproducing head may be close to the reproducing position. In this case, there has been a problem that video and audio cannot be reproduced.

  Further, as the functions of the data recording / reproducing apparatus increase, the number of processes controlled by the control circuit of the apparatus increases. In this case, depending on the control timing and the like, the operation of the recording / reproducing head may be insufficiently controlled, and thus the reproduction of video and audio may be interrupted.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a data recording / reproducing apparatus capable of smoothly reproducing recorded data during recording of video / audio data. It is to be.

  In order to solve the above-described problem, according to one aspect of the present invention, a data recording / reproducing apparatus includes a receiving unit for receiving video / audio data, a digital converting unit for converting analog data into digital data, Temporary storage means for temporarily storing digital data, compression processing means for reading and compressing digital data temporarily stored in the temporary storage means, and a temporary recording area for sequentially recording the digital data And a storage area for recording the digital data based on a recording instruction by the user, a recording means for storing the compressed digital data, and a random access to the recording means to write the digital data Recording / reproducing means for executing reading and reading, and a predetermined amount of data to be read at a predetermined time The recording control means for controlling the recording / reproducing means so as to write digital data having a data amount exceeding the ratio into the storage area, and the digital data is read from the storage area based on a reproduction instruction from the user, and is determined in advance. Time, reproduction control means for controlling the recording and reproduction means so as to transfer the read digital data to the temporary storage means, expansion processing means for reading and expanding the digital data stored in the temporary storage means, Analog conversion means for converting the decompressed digital data into analog data and output means for outputting the analog data are included.

  According to the data recording / reproducing apparatus, the received video / audio data is converted into digital data and stored in a temporary storage means (for example, a memory capable of reading or writing data at high speed). The compression processing means reads and compresses the digital data temporarily stored in the temporary storage means. The recording control means causes the recording / reproducing means to write digital data having a data amount exceeding a predetermined ratio with respect to the data amount read at a predetermined time in the storage area. The reproduction control means causes the recording / reproduction means to read out the digital data from the storage area based on a reproduction instruction from the user, and transfers the read digital data to the temporary storage means for a predetermined time (for example, several seconds). When the decompression processing means reads and decompresses the digital data stored in the temporary storage means, the analog conversion means converts the data into analog data. In this way, when the recorded data is played back during the recording of the video / audio data, the video / audio data for playback is recorded in the storage area by recording a data amount larger than the data amount to be played back. Is done. In addition, since the compressed data before being decompressed is read and stored as data for reproduction in the temporary storage means, even if the recording / reproduction means cannot perform a predetermined reproduction operation, the compressed data in the temporary storage means is stored. Since it can be expanded, it can be output as video / audio data. Thereby, it is possible to provide a data recording / reproducing apparatus capable of smoothly reproducing recorded data during recording of audiovisual data.

  According to another aspect of the present invention, a data recording / reproducing apparatus includes a digital data acquisition unit for acquiring digital data, a temporary storage unit for temporarily storing digital data, and a temporary storage unit. Compression processing means for reading and compressing stored digital data, a temporary recording area for sequentially recording digital data, and a storage area for recording digital data based on a recording instruction by a user Recording means for storing compressed digital data; recording / reproducing means for randomly accessing the recording means to execute writing and reading of the digital data; and data read at a predetermined time The recording / reproducing means is controlled so that digital data whose amount exceeds a predetermined ratio is written to the storage area. And recording / reproducing means for reading the digital data from the storage area based on a reproduction instruction from the user and transferring the read digital data to the temporary storage means for a predetermined time. A reproduction control means for reading, a decompression processing means for reading out and decompressing the digital data stored in the temporary storage means, and an output means for outputting the decompressed digital data.

  According to the data recording / reproducing apparatus, when digital data is acquired, the data is temporarily stored in the temporary storage means. The compression processing means reads the digital data and compresses it. The recording control unit causes the recording / reproducing unit to write, in the storage area, digital data having a data amount that exceeds a predetermined amount of data read at a predetermined time. The reproduction control means causes the recording / reproduction means to read out the digital data from the storage area based on a reproduction instruction from the user and transfer the read digital data to the temporary storage means for a predetermined time. When the decompression processing means reads and decompresses the digital data stored in the temporary storage means, the output means can output the decompressed data. In this way, when the recorded data is played back during the recording of the video / audio data, a larger amount of data than the amount of data to be played back is recorded as playback data (for example, video / audio data). ) Is recorded in the storage area. In addition, since the compressed data before decompression is read and stored in the temporary storage means as data for reproduction, the compressed data in the temporary storage means is stored even when the recording / reproduction means cannot perform a predetermined reproduction operation. Decompressed and output. Thereby, the data recording / reproducing apparatus can smoothly reproduce the recorded data during the recording of the video / audio data.

  Preferably, the recording control unit causes the recording / reproducing unit to write digital data having a data amount exceeding about 1.5 times the amount of data read at a predetermined time in the storage area.

  According to the data recording / reproducing apparatus, digital data having a data amount exceeding about 1.5 times the amount of data read at a predetermined time is recorded in the storage area. It is possible to prevent the data from being reproduced.

  Preferably, the reproduction control unit causes the recording / reproducing unit to transfer the read digital data to the temporary storage unit for about 1 second.

  According to the data recording / reproducing apparatus described above, the temporary storage means sequentially stores data for about 1 second, so that the data for reproduction is output by decompressing the data. In this way, it is possible to prevent the data output from being interrupted even when the reproducing operation of the recording / reproducing means is not performed smoothly.

  Preferably, the digital data acquisition means includes reception means for receiving video / audio data and generation means for generating digital data from the received video / audio data.

  According to the data recording / reproducing apparatus, it is possible to prevent the reproduction of the video / audio from being interrupted when the received video / audio data (for example, television program data) is reproduced during recording.

  Preferably, the video / audio data is analog data. The generation means converts the video / audio data into digital data.

  According to the data recording / reproducing apparatus, it is possible to prevent the reproduction of the video / audio from being interrupted when reproducing the analog video / audio data during recording.

  Preferably, the data recording / reproducing apparatus further includes analog conversion means for converting digital data into analog data, and analog data output means for outputting analog data. The output means outputs the digital data expanded by the expansion processing means to the analog conversion means.

  According to the data recording / reproducing apparatus, it is possible to prevent the data reproduction from being interrupted by connecting to a display device having an analog data connection terminal.

  According to the data recording / reproducing apparatus of the present invention, recorded data can be smoothly reproduced even during video / audio data recording.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  A data recording / reproducing apparatus 100 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of data recording / reproducing apparatus 100.

  The data recording / reproducing apparatus 100 includes a main system control circuit 110, an OSD (On Screen Display) image generation circuit 114, an operation unit 122, a light receiving unit 124, a timing circuit 126, a display unit 128, a tuner 130, , An external input unit 132, a hard disk device 140, an MPEG decoder 154, a subsystem control circuit 150, an output unit 168, and an antenna 190. The hard disk device 140 includes a data recording / reproducing head 142 and a hard disk 144. The subsystem control circuit 150 includes an MPEG (Moving Picture Experts Group) encoder 152, an MPEG decoder 154, and an SDRAM (Synchronous Dynamic Random Memory) 156. The data recording / reproducing apparatus 100 is connected to a television 180 and other display devices.

  The analog data received by the antenna 190 is detected by the tuner 130. The tuner 130 performs A / D conversion (Analog to Digital) on the detected data and outputs it as digital data.

  Digital data output from the tuner 130 is transferred to the SDRAM 156. The SDRAM 156 temporarily stores input data. At this time, the amount of input data in a predetermined time exceeds the amount of output data by a predetermined amount. The amount of input data is preferably more than about 1.5 times the amount of output data, for example. The input data is data (for example, video / audio recording data) recorded in the hard disk device 140 described later.

  Data stored in the SDRAM 156 is input to the MPEG encoder 152. The MPEG encoder 152 performs a predetermined encoding process on the input data, compresses it, and outputs it. The operation at this time is controlled by the subsystem control circuit 150. The control structure at this time will be described later.

  Data output from the MPEG encoder 152 is input to the hard disk device 140 as recording data. The data recording / reproducing head 142 of the hard disk device 140 writes input data in a predetermined recording area of the hard disk 144 under the control of the main system control circuit 110.

  The compressed data read from the hard disk device 140 is input to the SDRAM 156. The SDRAM 156 temporarily stores the data as compressed data as the compressed data.

  Data stored in the SDRAM 156 as reproduction data is input to the MPEG decoder 154. The MPEG decoder 154 decodes input data by executing a predetermined decoding process.

  Data output from the MPEG decoder 154 is input to the output unit 168. The output unit 168 combines the data output from the MPEG decoder 154 and the data output from the OSD image generation circuit 114 described later, and outputs the resultant as display data. This output data is input to the television 180 or other display device connected to the data recording / reproducing apparatus 100. Thus, the television 180 can display video and output audio based on the data reproduced by the data recording / reproducing apparatus 100.

  The operation unit 122 is an operation panel provided on the front surface of the data recording / reproducing apparatus 100, for example. The user can input a predetermined instruction via the operation unit 122 in order to cause the data recording / reproducing apparatus 100 to execute a specific operation. The operation unit 122 detects the instruction and outputs data corresponding to the instruction to the main system control circuit 110.

  The light receiving unit 124 is a light receiving unit for remote control signals provided on the front surface of the data recording / reproducing apparatus 100, for example. When the user operates a remote controller (not shown), the remote controller outputs a signal corresponding to the operation. The light receiving unit 124 receives the signal and outputs a command corresponding to the signal to the main system control circuit 110.

  The display unit 128 is an indicator or other monitor provided on the front surface of the data recording / reproducing apparatus 100, for example. The display unit 128 displays information corresponding to the signal output from the main system control circuit 110. This information includes, for example, the reception channel, time, the operation mode of the data recording / reproducing apparatus 100 (eg, recording mode, recording mode), and the like. Note that the displayed information is not limited to these.

  The external input unit 132 is, for example, a line input terminal for inputting data of another video / audio reproduction device. Thereby, the data recording / reproducing apparatus 100 can take in and record data other than a broadcast program.

  The data recording / reproducing apparatus 100 having the above configuration is, for example, an HDD recorder, but is not limited thereto. That is, the data recording / reproducing apparatus 100 only needs to be capable of recording digital data, and may be, for example, a PC (Personal Computer) or other computer including an HDD. In this case, the processing of the computer can be realized by causing a CPU (Central Processing Unit) to execute software for controlling the operation.

  Such software may be stored in advance in computer hardware, or may be stored and distributed in a CD-ROM (Compact Disk-Read Only Memory) or other recording medium, and the recording medium may be recorded by a disk drive device. May be temporarily stored in an HDD or other recording device that stores the program. The software is read from the recording device to a RAM (Random Access Memory) or other main storage unit and executed by the CPU. Such a computer configuration is general. Therefore, it can be said that the most essential part of the present invention is software recorded on an HDD or other recording device, or a CD-ROM or other recording medium.

  The operation itself of a computer having such a configuration is well known. Therefore, detailed description of the operation will not be repeated here.

  With reference to FIG. 2, data recorded in data recording / reproducing apparatus 100 according to the embodiment of the present invention will be described. FIG. 2 is a diagram showing an aspect of the configuration of the data recording area in hard disk 144 of hard disk device 140.

  As shown in FIG. 2, the hard disk 144 includes a system management area D200, a time shift area D210, and a recording file area D220 as areas for storing data.

  Control data for controlling the operation of the data recording / reproducing apparatus 100 is stored in the system management area D200. This operation includes, for example, writing or reading of video / audio data to / from a specific time shift data file in the time shift area D210, scheduled recording, and the like. The control data includes identification data for identifying a time shift data file, a flag indicating whether or not data can be written to a specific data recording area, recording start and recording end times for set scheduled recording, reception channels, recording Including modes.

  Data input to the data recording / reproducing apparatus 100 is temporarily recorded in the time shift area D210. This temporary recording is started, for example, when the data recording / reproducing apparatus 100 is turned on.

  In the recording file area D220, data instructed to be recorded by the user is recorded. The data recorded in this area is saved unless a deletion instruction is given by the user.

  With reference to FIG. 3, video / audio data received by data recording / reproducing apparatus 100 according to the present embodiment will be described. FIG. 3 is a diagram showing a signal waveform of video / audio data.

  FIG. 3A shows a waveform of an analog signal. As shown in FIG. 3A, the waveform of the analog signal varies based on a predetermined period. FIG. 3B shows a digital signal sampled with respect to the waveform of the analog signal. As shown in FIG. 3B, the digital signal is transmitted discretely. Therefore, the data recording / reproducing apparatus 100 can execute each process described later using this transmission characteristic.

  With reference to FIG. 4, data recorded in data recording / reproducing apparatus 100 according to the present embodiment will be further described. FIG. 4 is a diagram conceptually showing one mode of storing recorded data and reproduced data in SDRAM 156 included in subsystem control circuit 150.

  In FIG. 4A, the SDRAM 156 has a plurality of recording areas D400 as areas for storing data. When the data recording / reproducing apparatus 100 reproduces data that has been recorded for a predetermined time, if the amount of data required for the reproduction is the amount of data stored in the six recording areas D410, the amount that exceeds the amount of data The recorded data having “” is stored in the SDRAM 156. In this case, for example, about 1.5 times the data amount, that is, in the above example, the data amount stored in the area D420 corresponding to the nine recording areas D400 is preferable.

  FIG. 4B shows that when the data recording / reproducing apparatus 100 reproduces video / audio data, a predetermined area of the SDRAM 156 stores a data amount necessary for reproduction for at least one second. This data is data before being transferred to the MPEG decoder 154, that is, data in a compressed state.

  With reference to FIG. 5, a control structure of data recording / reproducing apparatus 100 according to the embodiment of the present invention will be described. FIG. 5 is a flowchart showing the procedure of the recording process executed by the data recording / reproducing apparatus 100. This process is controlled by the main system control circuit 110 and the subsystem control circuit 150.

  In step S502, the data recording / reproducing apparatus 100 receives the video / audio data from the antenna 190.

  In step S504, main system control circuit 110 causes tuner 130 to execute predetermined A / D conversion to generate digital data from the received data.

  In step S506, the subsystem control circuit 150 transfers the digital data output from the tuner 130 to the SDRAM 156. The SDRAM 156 temporarily stores this data.

  In step S508, the subsystem control circuit 150 reads the data stored in the SDRAM 156 and causes the MPEG encoder 152 to execute a predetermined compression process. The aspect of this compression process is not particularly limited.

  In step S 510, main system control circuit 110 and subsystem control circuit 150 transfer the compressed data output from MPEG encoder 152 to hard disk device 140. The hard disk device 140 writes input data in a predetermined recording area of the hard disk 144 based on the control of the main system control circuit 110.

  In step S 512, the main system control circuit 110 records the amount of compressed data written to the hard disk 144 in the memory 112.

  In step S514, the main system control circuit 110 determines whether or not a data amount of about 1.5 times the data amount at the time of reproduction has been written to the hard disk 144 based on the write amount recorded in the memory 112. If main system control circuit 110 determines that a data amount of about 1.5 times the data amount at the time of reproduction has been written to hard disk 144 (YES in step S514), the reproduction process (S600) is performed, and then the process is further terminated. If an instruction is detected (S518), the process ends. If not (NO in step S514), the process returns to step S510. On the other hand, if the end is not detected in step S518, the process returns to step S502.

  With reference to FIG. 6, the control structure of data recording / reproducing apparatus 100 according to the embodiment of the present invention will be further described. FIG. 6 is a flowchart showing the procedure of the reproduction process executed by the data recording / reproducing apparatus 100. This process is executed, for example, when the user inputs an instruction to reproduce recorded data.

  In step S602, the main system control circuit 110 reads the compressed data from the hard disk device 140 based on the reproduction instruction input by the user.

  In step S604, main system control circuit 110 transfers the read data to SDRAM 156. In this case, since the data is transferred to the SDRAM 156 before being input to the MPEG decoder 154, the data stored in the SDRAM 156 is data in a compressed state.

  In step S606, the main system control circuit 110 records the data amount transferred to the SDRAM 156 in the memory 112.

  In step S608, the main system control circuit 110 determines whether or not the amount of data that can be reproduced for about 1 second has been transferred based on the data recorded in the memory 112. If main system control circuit 110 determines that the amount of data has been transferred (YES in step S608), the process proceeds to step S610. If not (NO in step 608), the process returns to step S602, and reading of data from the hard disk device 140 is continued.

  In step S610, subsystem control circuit 150 reads compressed data from SDRAM 156.

  In step S612, subsystem control circuit 150 transfers the read compressed data to MPEG decoder 154.

  In step S614, the subsystem control circuit 150 causes the MPEG decoder 154 to execute a predetermined decompression process. Thereby, the compressed data is expanded and the original video / audio data is restored.

  In step S616, D / A converter 160 performs D / A conversion on the decompressed data to generate analog data. At this time, when the OSD image generation circuit 114 outputs image data, the D / A conversion unit 160 combines the decompressed data and the image data, and performs D / A conversion.

  In step S618, output unit 168 outputs the generated analog data to television 180.

  An operation of data recording / reproducing apparatus 100 according to the embodiment of the present invention based on the above-described structure and flowchart will be described.

[Recording operation]
When the user inputs a recording instruction to the data recording / reproducing apparatus 100, the video / audio data received by the tuner 130 is A / D converted to generate digital data (step S504). The digital data is transferred to the SDRAM 156 without being compressed (step S506) and temporarily stored. The data in the SDRAM 156 is compressed by the MPEG encoder 152 (step S508) and transferred to the hard disk device 140 (step S510). The main system control circuit 110 causes the hard disk device 140 to record the compressed data while recording the transfer amount of the compressed data in the memory 112 (step S512). When data about 1.5 times the amount of data required for reproduction is recorded on the hard disk device (step S514), reproduction processing is executed (step S600).

[Playback operation]
When the data recording / reproducing apparatus 100 is in a mode for reproducing recorded data, reproduction data in a compressed state is read from the hard disk device 140 (step S602) and transferred to the SDRAM 156 (step S604). The main system control circuit 110 records the transfer amount in the memory 112 (step S606), and when it is determined that the transfer of data that can be reproduced for about 1 second is completed based on the transfer amount (YES in step S608). ), The compressed data stored in the SDRAM 156 is read (step S610) and transferred to the MPEG decoder 154 (step S612). When the MPEG decoder 154 decompresses the compressed data (step S614), the data is converted into analog data (step S616) and output to the television 180 via the output unit 168 (step S618). In FIG. 5, the data recording / reproducing apparatus 100 continues the reproducing operation until the user inputs a reproduction end instruction (NO in step S518).

  As described above, the data recording / generating apparatus 100 according to the embodiment of the present invention temporarily stores the received video / audio data in the SDRAM 156 before recording it in the hard disk device 140. The SDRAM 156 can read or write data at high speed. Therefore, the data recording / reproducing apparatus 100 can record data necessary for reproduction on the hard disk device 140 by compressing the data stored in the SDRAM 156.

  That is, the data recording / reproducing apparatus 100 records more data than the amount of data read at the time of reproduction (for example, about 1.5 times the amount of data), so that more data than necessary for reproduction during recording is stored in the hard disk 144. Will be recorded. Accordingly, there is no loss of data read for reproduction, and the data recording / reproducing apparatus 100 can reproduce data stably.

  At the time of reproduction, data read from the hard disk device 140 is transferred to the SDRAM 156 as compressed data. In this case, at least a data amount (for example, a data amount that can be reproduced for about 1 second) that does not stop the reproduction data output is sequentially stored even if a reproduction operation delay occurs. The MPEG decoder 154 decompresses and restores the data. In this way, even if a reproduction operation is delayed to execute another function of the data recording / reproducing apparatus 100, the output data is based on the data stored in the SDRAM 156 at least for reproduction ( Restored data) is generated. As a result, the data recording / reproducing apparatus 100 continuously outputs the video / audio data for the user, so that the reproduction of the video / audio is prevented from being interrupted.

  In the above-described embodiment, the criterion for determining whether or not the transfer amount recorded in the memory 112 is sufficient is not limited to a value of about 1.5 times. This value may be changed according to the SDRAM 156 or other memory capable of reading or writing data at high speed, or the writing or reading speed of the hard disk device 140.

  In addition, the time for which the data amount of the compressed data temporarily stored in the SDRAM 156 for stable video / audio reproduction can be reproduced is not limited to about 1 second. This time can be adjusted by lengthening or shortening according to the processing speed or control performance of the main system control circuit 110 or the subsystem control circuit 150. By such adjustment, the amount of compressed data temporarily stored in the SDRAM 156 can be optimized, so that it is not necessary to increase the capacity of the SDRAM 156 unnecessarily.

  Furthermore, the data recording / reproducing apparatus according to the present embodiment includes a main system control circuit and a subsystem control circuit as circuits for controlling the operation of each unit, but the configuration of the control circuit is not limited thereto. . For example, a configuration including one control circuit including all functions included in each control circuit may be employed. In this case, the number of parts is reduced, and the assembly efficiency of the data recording / reproducing apparatus can be improved.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a block diagram showing the structure of the data recording / reproducing apparatus which concerns on embodiment of this invention. It is a figure showing the structure of the recording area of the data in the hard disk which the data recording / reproducing apparatus shown in FIG. 1 contains. It is a figure for demonstrating the signal which the data recording / reproducing apparatus shown in FIG. 1 receives. It is a figure for demonstrating the one aspect | mode of the data storage in SDRAM of the data recording / reproducing apparatus shown in FIG. It is a flowchart (the 1) showing the procedure of the process which the data recording / reproducing apparatus which concerns on embodiment of this invention performs. It is a flowchart (the 2) showing the procedure of the process which the data recording / reproducing apparatus which concerns on embodiment of this invention performs.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Data recording / reproducing apparatus, 110 Main system control circuit, 112 Memory, 114 OSD image generation circuit, 122 Operation part, 124 Light receiving part, 126 Time measuring circuit, 128 Display part, 130 Tuner, 132 External input part, 140 Hard disk device, 142 Data recording / reproducing head, 144 hard disk, 150 subsystem control circuit, 152 MPEG encoder, 154 MPEG decoder, 156 SDRAM, 160 D / A converter, 168 output unit, 180 TV, 190 antenna.

Claims (7)

Receiving means for receiving video and audio data;
Digital conversion means for converting analog data into digital data;
Temporary storage means for temporarily storing the digital data;
Compression processing means for reading out and compressing the digital data temporarily stored in the temporary storage means;
A recording means for storing the compressed digital data, having a temporary recording area for sequentially recording digital data, and a storage area for recording digital data based on a recording instruction by a user;
Recording / reproducing means for randomly accessing the recording means and executing writing and reading of the digital data;
A recording control means for controlling the recording / reproducing means so that the digital data having a data amount exceeding a predetermined ratio with respect to the data amount read at a predetermined time is written in the storage area;
To control the recording / reproducing means to read the digital data from the storage area based on a reproduction instruction by the user and to transfer the read digital data to the temporary storage means for a predetermined time. Reproduction control means,
Decompression processing means for reading and decompressing the digital data stored in the temporary storage means;
Analog conversion means for converting the expanded digital data into analog data;
A data recording / reproducing apparatus including output means for outputting the analog data. Digital data acquisition means for acquiring digital data;
Temporary storage means for temporarily storing the digital data;
Compression processing means for reading out and compressing the digital data temporarily stored in the temporary storage means;
A recording means for storing the compressed digital data, having a temporary recording area for sequentially recording digital data, and a storage area for recording digital data based on a recording instruction by a user;
Recording / reproducing means for randomly accessing the recording means and executing writing and reading of the digital data;
A recording control means for controlling the recording / reproducing means so as to write the digital data having a data amount exceeding a predetermined ratio with respect to a data amount read at a predetermined time;
In order to control the recording / reproducing unit to read the digital data from the storage area based on a reproduction instruction by the user and to transfer the read digital data to the temporary storage unit for a predetermined time. Reproduction control means,
Decompression processing means for reading and decompressing the digital data stored in the temporary storage means;
An output means for outputting the decompressed digital data.   3. The recording control unit according to claim 2, wherein the recording control unit causes the recording / reproducing unit to write the digital data having a data amount exceeding about 1.5 times the amount of data read at a predetermined time in the storage area. Data recording / reproducing device.   3. The data recording / reproducing apparatus according to claim 2, wherein the reproduction control unit causes the recording / reproducing unit to transfer the read digital data to the temporary storage unit for about 1 second. The digital data acquisition means includes
Receiving means for receiving video and audio data;
5. The data recording / reproducing apparatus according to claim 2, further comprising generating means for generating the digital data from the received video / audio data. The video / audio data is analog data,
6. The data recording / reproducing apparatus according to claim 5, wherein the generation unit converts the video / audio data into digital data. The data recording / reproducing apparatus further includes:
Analog conversion means for converting digital data into analog data;
Analog data output means for outputting the analog data,
7. The data recording / reproducing apparatus according to claim 2, wherein the output unit outputs the digital data expanded by the expansion processing unit to the analog conversion unit.

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