JP2007087471A - Recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus recording and reproducing a digital AV signal in real time with simple circuit constitution. <P>SOLUTION: In a buffer 302, a recording pointer indicating a head position of a recording region in which digital data read out from a first external storage apparatus 311 is to be recorded, a recording terminal pointer indicating a terminal of digital data already written, a reproducing pointer indicating a head position of data supplied to an AV decoder 303, reproduction finish pointer indicating a terminal of data finished to supply to the AV decoder 303, a preserving pointer indicating a terminal of data supplied to a second front end 305, and preservation finish pointer indicating a terminal of data finished to supply to the second front end 305 are managed, and control is performed so that the reproducing pointer and the preservation pointer do not exceed the recording pointer. Further, only when the preservation finish pointer exceeds the reproduction finish pointer, a value of the recording terminal pointer is updated to a value being same as the reproduction finish pointer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording / reproducing apparatus for copying a digital video or audio signal, and more particularly to a technique for simultaneously decoding or encoding a digital video or audio signal in real time.

  In recent years, with the widespread use of DVD players, the market for playback devices that expand digitally compressed video and audio signals is maturing. In addition, recording / reproducing apparatuses such as DVD recorders that compress digital audio and video and record them on an external storage device are becoming widespread.

  On the other hand, as storage devices such as hard disks and memory cards have become widespread, attempts have been made to save time and effort for disk replacement by adding copy and encoding functions to playback devices and copying (also called ripping) information on the disk. Has been made. Such a recording / reproducing apparatus is becoming widespread especially for in-vehicle audio.

  FIG. 1 is a block diagram showing a typical configuration of a conventional reproducing apparatus. As shown in FIG. 1, the front end 101 reads data 111 from an external storage device such as a disk and acquires a stream 112, and the acquired stream 112 is input to the AV decoder 102.

  Here, a buffer 121 is provided between the front end 101 and the AV decoder 102. The buffer 121 is generally provided to maintain real-time characteristics when digital video or audio data is exchanged between devices.

  Specifically, the instability factor due to a transient factor such as the data 111 read from the disk or the like becoming unstable and the supply speed of the stream 112 becoming unstable as a result can be removed. It has become. Thereby, real-time property can be guaranteed, and disturbance of an image or sound can be suppressed and generation of noise can be suppressed.

  The AV decoder 102 decodes the input stream 112 into a digital signal 113 including video or audio, and the decoded digital signal 113 is input to the DA converter 103.

  The DA converter 103 converts the input digital signal 113 into an analog signal as a final output, and this analog signal is output as an image or sound from an analog amplifier or the like.

  FIG. 2 is a block diagram showing a typical configuration of a conventional recording / reproducing apparatus. As shown in FIG. 2, the front end 201 reads data 221 from an external storage device 205 such as a disk and acquires a stream 212. The acquired stream 212 is sent to the stream control processor 202 via a buffer 232. Is output.

  The stream control processor 202 controls stream transfer, and the input stream 212 is output as a stream 214 to the AV decoder 203 via the buffer 234 when data reproduction is performed, while compressed recording is performed. When it is performed, the digital data 216 is output to the AV encoder 204 via the buffer 236.

  The AV decoder 203 decodes the input stream 214 into a digital signal 223, and the decoded digital signal 223 is input to the DA converter 206.

  The DA converter 206 converts the input digital signal 223 into an analog signal as a final output, and this analog signal is output as an image or sound from an analog amplifier or the like.

  The AV encoder 204 encodes the input digital data 216 to generate a stream 215, and the generated stream 215 is input to the stream control processor 202 via a buffer 235.

  The stream 215 input to the stream control processor 202 is output to the front end 201 via the buffer 231 as a stream 211 as recording data.

  The front end 201 acquires data 222 to be written to the external storage device 205 from the input stream 211, and the acquired data 222 is output to the external storage device 205.

  When recording the data read from the external storage device 205 without compression, first, the data 221 of the external storage device 205 is read by the front end 201 to acquire the stream 212, and the acquired stream 212 is Output to the stream control processor 202.

  Upon receiving the stream 212, the stream control processor 202 outputs a stream 211 to the front end 201 as recording data.

  The front end 201 acquires data 222 to be written to the external storage device 205 from the input stream 211 and outputs the data 222 to the external storage device 205.

The buffers 231, 232, 233, 234, 235, and 236 are installed to maintain a constant rate for a stream to be transmitted or received, and an overflow state in which the amount of data to be stored exceeds the buffer size, The underflow state where there is no data to keep is prevented.
JP 2003-259307 A

  However, when a total of two or more AV encoders and AV decoders are mounted as in the conventional recording / reproducing apparatus, the stream control for controlling the stream transfer between the front end processor, the AV encoder, and the AV decoder. A processor is required, which increases the cost.

  Furthermore, the stream control processor has a drawback that a buffer buffer is required for each input / output, which increases the circuit scale.

  The present invention has been made in view of such a point, and an object of the present invention is to guarantee real-time performance of the entire apparatus while suppressing an increase in circuit scale.

That is, the present invention is a recording / reproducing apparatus that reproduces digital data read from a first external storage device, and writes the read digital data to a second external storage device,
A signal reading unit for reading digital data from the first external storage device;
A signal storage unit for writing the read digital data to the second external storage device;
A playback unit for playing back the read digital data;
A temporary storage unit formed in a ring buffer structure capable of storing the read digital data and capable of selectively switching the transfer destination of the data;
The temporary storage unit
A recording pointer indicating the start position of the recording area in which the digital data is to be written on the ring buffer, a recording end pointer indicating the end of the already written digital data, and the start position of the data to be transferred to the reproduction unit A playback pointer indicating the end of the data transferred to the playback unit, a storage pointer indicating the start position of the data to be transferred to the signal storage unit, and the transfer to the signal storage unit Managing a save completion pointer indicating the end of data, and controlling the playback pointer and the save pointer so as not to exceed the recording pointer;
Only when the storage completion pointer exceeds the reproduction completion pointer, the value of the recording end pointer is updated to the same value as the reproduction completion pointer.

  According to the present invention, the digital data read from the first external storage device is copied to the second external storage device, and the bit rate of one buffer is controlled even when the digital data is reproduced. As a result, it is possible to rip video or audio signals without loss while guaranteeing real-time reproduction.

The present invention further includes a compression unit that digitally compresses the digital data read from the first external storage device,
The primary storage unit
Further managing a compression pointer indicating the start position of the data to be transferred to the compression unit on the ring buffer and a compression completion pointer indicating the end of the data transferred to the compression unit, the compression pointer Control not to exceed the recording pointer,
Only when the storage completion pointer and the compression completion pointer exceed the reproduction completion pointer, the value of the recording end pointer is updated to the same value as the reproduction completion pointer. It may be a thing.

  According to the present invention, digital data read from the first external storage device is copied to the second external storage device, the digital data is reproduced, and at the same time, the digital data is encoded to perform S / PDIF or HDMI Even in the case of outputting to a system that propagates a stream in real time, it is possible to rip video or audio signals without loss while ensuring the real-time performance of reproduction only by controlling the bit rate of one buffer. In addition, the real-time property of the encoded stream output can be guaranteed.

The present invention also provides a recording / reproducing apparatus that reproduces the digital data read from the first external storage device and writes the read digital data to the second external storage device.
A signal reading unit for reading digital data from the first external storage device;
A compression unit for digitally compressing the read digital data;
A signal storage unit for writing the digital data digitally compressed by the compression unit into the second external storage device;
A playback unit for playing back the read digital data;
A temporary storage unit formed in a ring buffer structure capable of storing the read digital data and capable of selectively switching the transfer destination of the data;
The temporary storage unit
A recording pointer indicating the start position of the recording area in which the digital data is to be written on the ring buffer, a recording end pointer indicating the end of the already written digital data, and the start position of the data to be transferred to the reproduction unit A playback pointer indicating the end of the data that has been transferred to the playback unit, a compression pointer that indicates the start position of the data to be transferred to the compression unit, and the data that has been transferred to the compression unit Managing a compression completion pointer representing the end, and controlling the playback pointer and the compression pointer so as not to exceed the recording pointer;
Only when the compression completion pointer exceeds the reproduction completion pointer, the value of the recording end pointer is updated to the same value as the reproduction completion pointer. Good.

  According to the present invention, even when digital data read from the first external storage device is reproduced and the digital data is encoded and stored in the second external storage device, the bit rate control of one buffer is performed. By simply performing the process, it is possible to guarantee the real-time reproduction and to save the encoded stream without any loss.

Further, the present invention is a recording / reproducing apparatus that analyzes information concealed in digital data read from a first external storage device, and writes the read digital data to a second external storage device,
A signal reading unit for reading digital data from the first external storage device;
A signal storage unit for writing the read digital data to the second external storage device;
An analysis unit for acquiring information concealed in the read digital data;
A temporary storage unit formed in a ring buffer structure capable of storing the read digital data and capable of selectively switching the transfer destination of the data;
The temporary storage unit
A recording pointer indicating the start position of the recording area where the digital data is to be written on the ring buffer, a recording end pointer indicating the end of the already written digital data, and the start position of the data to be transferred to the analysis unit An analysis pointer indicating, an analysis completion pointer indicating the end of data transferred to the analysis unit, a storage pointer indicating a head position of data to be transferred to the signal storage unit, and transfer to the signal storage unit Managing a save completion pointer indicating the end of data, and controlling the analysis pointer and the save pointer so as not to exceed the recording pointer;
Even when the storage completion pointer exceeds the analysis completion pointer, the value of the recording end pointer is updated to the same value as the analysis completion pointer. Good.

  According to the present invention, even when the information concealed in the digital data read from the first external storage device is analyzed and the digital data is copied to the second external storage device, By only performing bit rate control, it is possible to correctly detect information concealed in the digital data and to rip video or audio signals without loss.

  As described above, according to the present invention, it is possible to perform reproduction stream copy, encoding, or acquisition of concealment information while ensuring real-time reproduction without significantly changing the circuit scale. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

<Embodiment 1>
FIG. 3 is a block diagram showing the configuration of the recording / reproducing apparatus according to Embodiment 1 of the present invention. As shown in FIG. 3, the first front end 301 (signal reading unit) reads data from a first external storage device 311 such as a disk and converts it into digital data. The data is input to 302 (primary storage unit).

  The buffer 302 has a ring buffer structure and holds input digital data and controls data transfer. The input data is output to the AV decoder 303 when performing data reproduction, and is output to the second front end 305 (signal storage unit) when storing data.

  The AV decoder 303 (reproducing unit) decodes input data into a digital signal, and the decoded digital signal is input to the DA converter 304.

  The DA converter 304 converts an input digital signal into an analog signal as a final output, and the analog signal is output as video or audio.

  The data input to the second front end 305 is output to the second external storage device 312 and stored.

  Hereinafter, buffer control in the recording / reproducing apparatus according to the first embodiment will be described. Data read from the first external storage device 311 is converted into digital data by the first front end 301 and supplied to the buffer 302. At this time, the write pointer in the buffer 302 is managed as a “record pointer”.

  Next, the AV decoder 303 is supplied with data starting from the “reproduction pointer” from the buffer 302. When the AV decoder 303 completes data capture, the “playback completion pointer” is set to the same value as the current playback pointer.

  The second front end 305 is supplied with data starting from the “save pointer” from the buffer 302. When the second front end 305 completes the data capture, the “save completion pointer” is set to the same value as the current save pointer.

  Here, the playback pointer and the storage pointer of the data are controlled so as not to exceed the recording pointer, so that the read data is correctly played back and stored.

  Further, the recording completion pointer is updated so as to advance to the reproduction completion pointer instead of the save pointer, so that real-time reproduction can be ensured.

  As described above, according to the recording / reproducing apparatus of the first embodiment, the digital data read from the first external storage device is copied to the second external storage device and the digital data is reproduced. Even if only the bit rate control of one buffer is performed, it is possible to rip video or audio signals without loss while guaranteeing real-time reproduction.

<Embodiment 2>
FIG. 4 is a block diagram showing a configuration of a recording / reproducing apparatus according to Embodiment 2 of the present invention. As shown in FIG. 4, the first front end 401 reads data from a first external storage device 411 such as a disk and converts it into digital data. The converted data is input to a buffer 402. .

  The buffer 402 has a ring buffer structure, holds input digital data and controls data transfer. The input data is output to the AV decoder 403 when data reproduction is performed, output to the AV encoder 404 (compression unit) when data is compressed, and the second front end when data is stored. 407 is output.

  The AV decoder 403 decodes input data into a digital signal, and the decoded digital signal is input to the DA converter 405.

  The DA converter 405 converts an input digital signal into an analog signal as a final output, and the analog signal is output as video or audio.

  The AV encoder 404 encodes input digital data to generate a stream, and the generated stream is output from an output terminal via an S / PDIF (Sony / Philips Digital Interface) transmitter 406.

  In the second embodiment, the case where the S / PDIF transmitter 406 is used has been described. However, the present invention is not limited to this mode, and for example, an HDMI (High-Definition Multimedia Interface) transmitter may be used.

  The data input to the second front end 407 is output to the second external storage device 412 and stored.

  Hereinafter, buffer control in the recording / reproducing apparatus according to the second embodiment will be described. Data read from the first external storage device 411 is converted into digital data by the first front end 401 and supplied to the buffer 402. At this time, the write pointer in the buffer 402 is managed as a “record pointer”.

  Next, the AV decoder 403 is supplied with data starting from the “playback pointer” from the buffer 402. When the AV decoder 403 completes the data capture, the “playback completion pointer” is set to the same value as the current playback pointer.

  The AV encoder 404 is supplied with data starting from the “compression pointer” from the buffer 402. When the AV encoder 404 completes the data capture, the “compression completion pointer” is set to the same value as the current compression pointer.

  The second front end 407 is supplied with data starting from the “store pointer” from the buffer 402. When the data capture is completed in the second front end 407, the “save completion pointer” is set to the same value as the current save pointer.

  Here, the data reproduction pointer, compression pointer, and storage pointer are controlled so as not to exceed the recording pointer, so that the read data is correctly reproduced, compressed, and stored.

  Further, the update of the recording completion pointer is controlled so as to advance to the reproduction completion pointer instead of the save pointer or the compression pointer, so that real-time performance of reproduction and compression can be guaranteed.

  As described above, according to the recording / reproducing apparatus according to the second embodiment, the digital data read from the first external storage device is copied to the second external storage device, the digital data is reproduced, and at the same time, Even when digital data is encoded and output to a system that propagates the stream in real time, such as S / PDIF or HDMI, real-time reproduction is ensured only by controlling the bit rate of one buffer. The video or audio signal can be ripped without loss, and the real time property of the encoded stream output can be guaranteed.

<Embodiment 3>
FIG. 5 is a block diagram showing a configuration of a recording / reproducing apparatus according to Embodiment 3 of the present invention. As shown in FIG. 5, the first front end 501 reads data from the first external storage device 511 such as a disk and converts it into digital data, and the converted data is input to the buffer 502. .

  The buffer 502 has a ring buffer structure, holds input digital data and controls data transfer. The input data is output to the AV decoder 503 when data reproduction is performed, and is output to the AV encoder 504 when data is compressed.

  The AV decoder 503 decodes input data into a digital signal, and the decoded digital signal is input to the DA converter 505.

  The DA converter 505 converts an input digital signal into an analog signal as a final output, and the analog signal is output as video or audio.

  The AV encoder 504 encodes input digital data to generate a stream, and the generated stream is output to the second front end 506.

  The data input to the second front end 506 is output to the second external storage device 512 and stored.

  Hereinafter, buffer control in the recording / reproducing apparatus according to the third embodiment will be described. Data read from the first external storage device 511 is converted into digital data by the first front end 501 and supplied to the buffer 502. At this time, the write pointer in the buffer 502 is managed as a “record pointer”.

  Next, the AV decoder 503 is supplied with data starting from the “playback pointer” from the buffer 502. When the AV decoder 503 completes data capture, the “playback completion pointer” is set to the same value as the current playback pointer.

  The AV encoder 504 is supplied with data starting from the “compression pointer” from the buffer 502. When the AV encoder 504 completes the data capture, the “compression completion pointer” is set to the same value as the current compression pointer.

  Here, the data reproduction pointer and the compression pointer are controlled so as not to exceed the recording pointer, so that the read data is correctly reproduced and stored.

  Further, the update of the recording completion pointer is controlled so as to advance to the reproduction completion pointer instead of the compression pointer, so that real-time reproduction can be ensured.

  As described above, according to the recording / reproducing apparatus according to the third embodiment, the digital data read from the first external storage device is reproduced and the digital data is encoded and stored in the second external storage device. Even so, by only controlling the bit rate of one buffer, it is possible to guarantee real-time reproduction and to save the encoded stream without any loss.

<Embodiment 4>
FIG. 6 is a block diagram showing a configuration of a recording / reproducing apparatus according to Embodiment 4 of the present invention. As shown in FIG. 6, the first front end 601 reads data from a first external storage device 611 such as a disk and converts it into digital data. The converted data is input to a buffer 602. .

  The buffer 602 has a ring buffer structure, holds input digital data and controls data transfer. The input data is output to the concealment information detector 603 (analysis unit) when performing data reproduction, and is output to the second front end 605 when storing data.

  The concealment information detector 603 obtains information concealed by analyzing video or audio digital data, and the obtained concealment information is output to the external control IC 604.

  The data input to the second front end 605 is output to the second external storage device 612 and stored.

  Hereinafter, buffer control in the recording / reproducing apparatus according to the fourth embodiment will be described. Data read from the first external storage device 611 is converted into digital data by the first front end 601 and supplied to the buffer 602. At this time, the write pointer in the buffer 602 is managed as a “record pointer”.

  Next, the concealment information detector 603 is supplied with data starting from the “analysis pointer” from the buffer 602. When the concealment information detector 603 completes data capture, the “analysis completion pointer” is set to the same value as the current analysis pointer.

  The second front end 605 is supplied with data starting from the “save pointer” from the buffer 602. When the data capture is completed in the second front end 605, the “save completion pointer” is set to the same value as the current save pointer.

  Here, the data analysis pointer and the storage pointer are controlled so as not to exceed the recording pointer, and the read data is correctly analyzed.

  The update of the recording completion pointer is controlled so as to advance to the analysis pointer instead of the save pointer, so that the analysis operation can be guaranteed.

  As described above, according to the recording / reproducing apparatus in the fourth embodiment, the information concealed in the digital data read from the first external storage device is analyzed and generated, and the digital data is stored in the second external storage device. Even in the case of copying, it is possible to correctly detect the information concealed in the digital data and to rip the video or audio signal without loss only by controlling the bit rate of one buffer.

  As described above, when adding a ripping function to a playback device, the present invention is extremely useful because it provides a highly practical effect of ensuring real-time performance of the entire device while suppressing an increase in circuit scale. And industrial applicability is high.

It is a block diagram which shows the structure of the conventional reproducing | regenerating apparatus. It is a block diagram which shows the structure of the conventional recording / reproducing apparatus. It is a block diagram which shows the structure of the recording / reproducing apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the recording / reproducing apparatus which concerns on this Embodiment 2. It is a block diagram which shows the structure of the recording / reproducing apparatus which concerns on this Embodiment 3. It is a block diagram which shows the structure of the recording / reproducing apparatus which concerns on this Embodiment 4.

Explanation of symbols

301 first front end 302 buffer 303 AV decoder 304 DA converter 305 second front end 311 first external storage device 312 second external storage device 401 first front end 402 buffer 403 AV decoder 404 AV encoder 405 DA Converter 406 S / PDIF transmitter 407 Second front end 411 First external storage device 412 Second external storage device 501 First front end 502 Buffer 503 AV decoder 504 AV encoder 505 DA converter 506 Second front end 511 First external storage device 512 Second external storage device 601 First front end 602 Buffer 603 Concealment information detector (analysis unit)
604 External control IC
605 Second front end 611 First external storage device 612 Second external storage device

Claims (4)

A recording / reproducing apparatus that reproduces digital data read from a first external storage device, and writes the read digital data to a second external storage device,
A signal reading unit for reading digital data from the first external storage device;
A signal storage unit for writing the read digital data to the second external storage device;
A playback unit for playing back the read digital data;
A temporary storage unit formed in a ring buffer structure capable of storing the read digital data and capable of selectively switching the transfer destination of the data;
The temporary storage unit
A recording pointer indicating the start position of the recording area in which the digital data is to be written on the ring buffer, a recording end pointer indicating the end of the already written digital data, and the start position of the data to be transferred to the reproduction unit A playback pointer indicating the end of the data transferred to the playback unit, a storage pointer indicating the start position of the data to be transferred to the signal storage unit, and the transfer to the signal storage unit Managing a save completion pointer indicating the end of data, and controlling the playback pointer and the save pointer so as not to exceed the recording pointer;
A recording / reproducing apparatus configured to update the value of the recording end pointer to the same value as the reproduction completion pointer only when the storage completion pointer exceeds the reproduction completion pointer. The recording / reproducing apparatus according to claim 1,
A compression unit that digitally compresses the digital data read from the first external storage device;
The primary storage unit
Further managing a compression pointer indicating the start position of the data to be transferred to the compression unit on the ring buffer and a compression completion pointer indicating the end of the data transferred to the compression unit, the compression pointer Control not to exceed the recording pointer,
Only when the storage completion pointer and the compression completion pointer exceed the reproduction completion pointer, the value of the recording end pointer is updated to the same value as the reproduction completion pointer. Recording / playback device. A recording / reproducing apparatus that reproduces digital data read from a first external storage device, and writes the read digital data to a second external storage device,
A signal reading unit for reading digital data from the first external storage device;
A compression unit for digitally compressing the read digital data;
A signal storage unit for writing the digital data digitally compressed by the compression unit into the second external storage device;
A playback unit for playing back the read digital data;
A temporary storage unit formed in a ring buffer structure capable of storing the read digital data and capable of selectively switching the transfer destination of the data;
The temporary storage unit
A recording pointer indicating the start position of the recording area in which the digital data is to be written on the ring buffer, a recording end pointer indicating the end of the already written digital data, and the start position of the data to be transferred to the reproduction unit A playback pointer indicating the end of the data that has been transferred to the playback unit, a compression pointer that indicates the start position of the data to be transferred to the compression unit, and the data that has been transferred to the compression unit Managing a compression completion pointer representing the end, and controlling the playback pointer and the compression pointer so as not to exceed the recording pointer;
A recording / reproducing apparatus configured to update the value of the recording end pointer to the same value as the reproduction completion pointer only when the compression completion pointer exceeds the reproduction completion pointer. A recording / reproducing apparatus that analyzes information concealed in digital data read from a first external storage device, and writes the read digital data to a second external storage device;
A signal reading unit for reading digital data from the first external storage device;
A signal storage unit for writing the read digital data to the second external storage device;
An analysis unit for acquiring information concealed in the read digital data;
A temporary storage unit formed in a ring buffer structure capable of storing the read digital data and capable of selectively switching the transfer destination of the data;
The temporary storage unit
A recording pointer indicating the start position of the recording area where the digital data is to be written on the ring buffer, a recording end pointer indicating the end of the already written digital data, and the start position of the data to be transferred to the analysis unit An analysis pointer indicating, an analysis completion pointer indicating the end of data transferred to the analysis unit, a storage pointer indicating a head position of data to be transferred to the signal storage unit, and transfer to the signal storage unit Managing a save completion pointer indicating the end of data, and controlling the analysis pointer and the save pointer so as not to exceed the recording pointer;
A recording / reproducing apparatus configured to update the value of the recording end pointer to the same value as the analysis completion pointer only when the storage completion pointer exceeds the analysis completion pointer.

Images