Recording and reproducing apparatus

Abstract

In a recording and reproducing apparatus for recording and reproducing video data, includes: a shuffling memory ( 6 ); a writing means for writing video data into the shuffling memory in accordance with the synchronizing signal and a write reference clock signal in synchronization with the video data; and a reading means for reading out the video data from the shuffling memory in accordance with a synchronizing signal and a stabilized read reference clock which is asynchronous with the write clock signal.

1. A recording and reproducing apparatus for recording and reproducing video data, comprising:
 a memory; 
 a writing means for writing video data into the memory in accordance with a synchronizing signal and a write reference clock signal in synchronization with the video data; and 
 a reading means for reading out the video data from the memory in accordance with a synchronizing signal and a stabilized read reference clock asynchronous with a write clock, wherein the memory at least has a capacity of three frames of video data and is provided with a page management means for managing frame pages of the memory, and the reading means reads the video data, which has been written in accordance with the page management means by the writing means, in accordance with instructions for double reading of the same frame and frame dropping from the page management means. 
 
     
     
       2. The recording and reproducing apparatus according to  claim 1 , wherein the page management means included: a detecting means for detecting whether a frame length of a frame pulse of video data falls within a designated range; and a retaining means for performing control so that the writing to the memory and a readout page are retained when the detecting means detects that the frame length falls out of the predetermined range. 
     
     
       3. The recording and reproducing apparatus according to  claim 1 , wherein the memory is used in common for recording and reproducing. 
     
     
       4. The recording and reproducing apparatus according to  claim 2 , wherein the memory is used in common for recording and reproduction. 
     
     
       5. The recording and reproducing apparatus according to  claim 1 , further comprising a means for recording a compressed stream received by way of an interface (I/F) as being recorded by a clock signal obtained based on the reference clock signal in synchronism with received data. 
     
     
       6. The recording and reproducing apparatus according to  claim 2 , further comprising a means for recording a compressed stream received by way of an interface (I/F) as being recorded by a clock signal obtained based on the reference clock signal in synchronism with the received data. 
     
     
       7. The recording and reproducing apparatus according to  claim 1 , wherein at least one of the readout reference clock signal and the synchronizing signal used by the reading means is supplied from the outside of the recording and reproducing apparatus. 
     
     
       8. The recording and reproducing apparatus according to  claim 2 , wherein at least one of the readout reference clock signal and the synchronizing signal used by the reading means is supplied from the outside of the recording and reproducing apparatus. 
     
     
       9. A video editing system including a multiple number of recording and reproducing apparatus according to  claim 1  and a video editing unit for editing the video data read out from the memories of the multiple recording and reproducing apparatus, characterized in that a same reference clock signal and synchronizing signal are used in common on the side of reading video data from the memories so as to synchronize an output video picture from each recording and reproducing apparatus with that from the others. 
     
     
       10. A video editing system including a multiple number of recording and reproducing apparatus according to  claim 2  and a video editing unit for editing the video data read out from the memories of the multiple recording and reproducing apparatus, characterized in that a same reference clock signal and synchronizing signal are used in common on the side of reading video data from the memories so as to synchronize an output video picture from each recording and reproducing apparatus with that from the others. 
     
     
       11. A recording and reproducing apparatus for recording and reproducing video data, comprising:
 a memory;   a writing means for writing video data into the memory in accordance with a synchronizing signal and a write reference clock signal in synchronization with the video data; and   a reading means for reading out the video data from the memory in accordance with a synchronizing signal and a stabilized read reference clock asynchronous with a write clock, wherein the memory at least has a capacity of three frames of video data and is provided with a page management means for managing frame pages of the memory, and the reading means reads the video data, which has been written in accordance with the page management means by the writing means, in accordance with instructions for double reading of the same frame or frame dropping from the page management means.   
     
     
       12. The recording and reproducing apparatus according to claim 11, wherein the page management means includes:
 a detecting means for detecting whether a frame length of a frame pulse of video data falls within a designated range; and   a retaining means for performing control so that the writing to the memory and a readout page are retained when the detecting means detects that the frame length falls out of the predetermined range.   
     
     
       13. The recording and reproducing apparatus according to claim 11, wherein the memory is used in common for recording and reproducing. 
     
     
       14. The recording and reproducing apparatus according to claim 12, wherein the memory is used in common for recording and reproduction. 
     
     
       15. The recording and reproducing apparatus according to claim 11, further comprising a means for recording a compressed stream received by way of an interface (I/F) as being recorded by a clock signal obtained based on the reference clock signal in synchronism with received data. 
     
     
       16. The recording and reproducing apparatus according to claim 12, further comprising a means for recording a compressed stream received by way of an interface (I/F) as being recorded by a clock signal obtained based on the reference clock signal in synchronism with the received data. 
     
     
       17. The recording and reproducing apparatus according to claim 11, wherein at least one of the readout reference clock signal and the synchronizing signal used by the reading means is supplied from the outside of the recording and reproducing apparatus. 
     
     
       18. The recording and reproducing apparatus according to claim 12, wherein at least one of the readout reference clock signal and the synchronizing signal used by the reading means is supplied from the outside of the recording and reproducing apparatus. 
     
     
       19. A video editing system including a multiple number of recording and reproducing apparatus according to claim 11 and a video editing unit for editing the video data read out from the memories of the multiple recording and reproducing apparatus, wherein a same reference clock signal and synchronizing signal are used in common on the side of reading video data from the memories so as to synchronize an output video picture from each recording and reproducing apparatus with that from the others. 
     
     
       20. A video editing system including a multiple number of recording and reproducing apparatus according to claim 12 and a video editing unit for editing the video data read out from the memories of the multiple recording and reproducing apparatus, wherein a same reference clock signal and synchronizing signal are used in common on the side of reading video data from the memories so as to synchronize an output video picture from each recording and reproducing apparatus with that from the others.