Recording/reproducing apparatus, video data recording apparatus, recording method, and reproducing method

Abstract

A demultiplexing/GOP head detecting section detects a PCR value, while a recording/reproduction control section records a video or audio packet in a bit stream file and records information on the number of packets every PCR value and GOP. In reproduction, a reproduction position corresponding to a shift time is judged on the basis of information on the number of packets at every PCR value and GOP. This improves the shifting and returning speeds to time shift reproduction.

What is claimed is:  
     
         1 . A recording and reproducing apparatus comprising: 
 a reproduction unit detecting device for receiving a compressed and encoded signal to detect a head of a reproduction unit of the received signal;    a recording and reproducing device for recording said compressed and encoded signal on a predetermined record medium and further for reproducing the recorded signal;    a management information recording device for recording time information corresponding to said head of said reproduction unit and information on a signal quantity in said reproduction unit; and    a reproduction control device for making a decision on a reproduction position of said predetermined record medium in reproduction on the basis of said time information and said signal quantity information recorded by said management information recording device.    
     
     
         2 . A recording and reproducing apparatus according to  claim 1 , wherein said management information recording device is made to record said time information and said signal quantity information in an area different from an area of said compressed and encoded signal.  
     
     
         3 . A recording and reproducing apparatus according to  claim 1 , wherein said management information recording device is made to record said time information and signal quantity information on said compressed and encoded signal in a multiplexed state.  
     
     
         4 . A recording and reproducing apparatus according to  claim 1 , wherein said compressed and encoded signal is a signal conforming to the MPEG system, and said reproduction unit forms a GOP.  
     
     
         5 . A recording and reproducing apparatus according to  claim 1 , further comprising a decoding device for decoding one of said compressed and encoded signal and a signal reproduced by said recording and reproducing device.  
     
     
         6 . A recording and reproducing apparatus according to  claim 1 , wherein said compressed and encoded signal is a signal conforming to the MPEG system, and said recording and reproducing device is made to record a transport stream, while said management information recording device records, in addition to said time information and said signal quantity information, at least one of a PID of said transport stream to be recorded and a service ID.  
     
     
         7 . A recording and reproducing apparatus according to  claim 1 , wherein said management information recording device is made to record said time information and said signal quantity information at every program to be recorded by said recording and reproducing device.  
     
     
         8 . A recording and reproducing apparatus according to  claim 1 , wherein said compressed and encoded signal is a signal conforming to the MPEG system, and said time information corresponding to said head of said reproduction unit is at least one of a PCR value included in said compressed signal, a STC value based on said PCR value, time measurement information for use in signal processing, and a PTS and a DTS included in said compressed signal.  
     
     
         9 . A recording and reproducing apparatus according to  claim 1 , wherein signal quantity information on said reproduction unit is one of the number of packets, the number of bytes and the number of bits in said reproduction unit and an encoded bit rate.  
     
     
         10 . A recording and reproducing apparatus according to  claim 1 , wherein said recording and reproducing device is made to start the recording from said head of said reproduction unit.  
     
     
         11 . A recording and reproducing apparatus according to  claim 1 , wherein said reproduction control device calculates a time information value of a shifting destination on the basis of a shift time in time shift reproduction to obtain time information corresponding to data being reproduced, and changes a reproduction position on said predetermined record medium on the basis of a difference between the obtained time information and said time information value of said shifting destination.  
     
     
         12 . A recording and reproducing apparatus according to  claim 1 , further comprising a shift time displaying device for displaying a shift time in time shift reproduction by calculating a difference between time information obtained in recording on a program recorded by the recording and reproducing device and time information obtained at the display.  
     
     
         13 . A recording and reproducing apparatus according to  claim 1 , further comprising a shiftable time displaying device for, in time shift reproduction, obtaining a shiftable time to the future by calculating a difference between time information obtained in recording on a program recorded by the recording and reproducing device and time information obtained at the display and obtaining a shiftable time to the past by calculating a difference between the oldest time information of data of said program and said time information obtained at the display to display said shiftable time to the future and said shiftable time to the past.  
     
     
         14 . A recording and reproducing apparatus according to  claim 1 , wherein said reproduction control device calculates a shifting destination of data to be read out from said record medium on the basis of information on a multiplier by which its reproduction-speed increases accordingly, said time information and said signal quantity information in special reproduction.  
     
     
         15 . A recording and reproducing apparatus according to  claim 5 , wherein said reproduction control device gives a signal reproduced by said recording and reproducing device to said decoding device when a free space exists in a buffer of said decoding device.  
     
     
         16 . A recording and reproducing apparatus according to  claim 1 , wherein said compressed and encoded signal is a signal conforming to the MPEG system, and said management information recording device records a PCR value immediately before said head of said reproduction unit as said time information and records a signal quantity between the PCR values immediately before said heads of said two reproduction units as said signal quantity information.  
     
     
         17 . A video data recording apparatus which records video data on a disk in a state where said video data is divided into access units of said disk, said recording apparatus comprising a recording device for conducting the recording in a state where an index for access to said access unit where specific video data is recorded is given to each of said access units.  
     
     
         18 . A video data recording method of recording video data on a disk in a state where said video data is divided into access units of said disk, comprising a step of conducting the recording in a state where an index for access to said access unit where specific video data is recorded is given to each of said access units.  
     
     
         19 . A video data recording method according to  claim 17 , wherein said index is made to indicate a recording start position of said access unit, where said specific video data is recorded, with one of an absolute address and a relative address.  
     
     
         20 . A video data recording method according to  claim 17 , wherein said index is made to indicate a recording start position of said access unit, where said specific video data is recorded and which exists before a given access unit in an absolute address order, with a relative address.  
     
     
         21 . A video data recording method according to  claim 17 , wherein said access unit includes a first access unit having a predetermined data quantity and second access units formed by dividing said first access unit into a plurality of sections, and said index includes a first index for access to said first access unit and a second index for access to said second access unit.  
     
     
         22 . A video data recording method according to any one of  claims 18  to  21 , wherein said video data is data compressed and encoded according to the MPEG standard, and said specific video data is data corresponding to one of an in-frame encoded image and a sequence header.  
     
     
         23 . A video data reproducing method of reproducing video data at an N-times speed from a disk on which said video data is recorded in a state of being divided into access units and an index for access to said access unit where a specific video data exists is recorded in each of said access units, comprising the steps of: 
 reading out said index from said disk every predetermined number of access units set in accordance with a multiplier (N) by which a reproduction speed increases accordingly;    whenever said index is read out, detecting a recorded position of said access unit, where said specific video data exists, on the basis of the read index; and    reading out recorded data from said access unit at the detected position.    
     
     
         24 . A video data reproducing method according to  claim 23 , further comprising a step of, if said access unit detected by said index read out from a given access unit is identical to said access unit detected on the basis of said index of-said access unit read out before said given access unit in the N-times speed reproduction, outputting information indicative of the fact that said video data is the same as previous data.