Digital signal recording devices, digital signal recording/playback devices, and digital signal receiving/recording/playback devices

Abstract

A digital signal recording device including: a digital broadcasting receiver which receives a digital broadcasting signal; an analog tuner which receives an analog broadcasting signal in which an analog video signal and an analog audio signal are multiplexed; a video A/D converter which converts to a digital video signal; a recording selection unit which selects the digital signal received by the digital broadcasting receiver or the signal multiplexed by the multiplexer; a recording unit which records the digital signal selected by the recording selection unit; and wherein the digital signal recording device is operable in a first mode in which the received digital signal is recorded and in a second mode in which the multiplexed digital signal is recorded, and the clock selecting unit selects the clock inputted from the first clock generator in the first mode and selects the internal clock in the second mode.

1 . A digital signal recording device comprising: 
 a digital broadcasting receiver which receives a digital broadcasting signal in which a compressed video signal and a compressed audio signal are multiplexed in a packet form of a predetermined fixed length;    a first clock generator which generates a clock which is in synchronism with the digital signal received by the digital broadcasting receiver;    an analog tuner which receives an analog broadcasting signal in which an analog video signal and an analog audio signal are multiplexed;    a video A/D converter which converts the analog video signal received by the analog tuner to a digital video signal;    a video encoder which information-compresses the digital video signal converted by the video A/D converter;    an audio A/D converter which converts the analog audio signal received by the analog tuner to a digital audio signal;    an audio encoder which information-compresses the digital audio signal converted by the audio A/D converter;    a second clock generator which generates an internal clock used by the video encoder and audio encoder;    a multiplexer which multiplexes at least a compressed video signal compressed by the video encoder and a compressed audio signal compressed by the audio encoder, to produce a signal having the packet form;    a recording selection unit which selects the digital signal received by the digital broadcasting receiver or the signal multiplexed by the multiplexer;    a clock selecting unit which outputs a selected one of the clock generated by the first clock generator or the internal clock generated by the second clock generator;    a recording unit which records the digital signal selected by the recording selection unit; and    wherein the digital signal recording device is operable in a first mode in which the received digital signal is recorded and in a second mode in which the multiplexed digital signal is recorded, and the clock selecting unit selects the clock inputted from the first clock generator in the first mode and selects the internal clock in the second mode.    
   
   
       2 . The digital recording device according to  claim 1 , wherein the compressed video signal and compressed audio signal are signals of packet form having a predetermined byte number specified by a MPEG standard, and the multiplexer is configured to multiplex at least PAT packets and PMT packets.  
   
   
       3 . The digital recording device according to  claim 2 , wherein the multiplexer multiplexes SI table information.  
   
   
       4 . A digital signal recording and playback device comprising: 
 a digital broadcasting receiver which receives a digital broadcasting signal in which a compressed video signal and a compressed audio signal are multiplexed in a packet form of a predetermined fixed length;    a first clock generator which generates a clock which is in synchronism with the digital signal received by the digital broadcasting receiver;    an analog tuner which receives an analog broadcasting signal in which an analog video signal and an analog audio signal are multiplexed;    a video A/D converter which converts the analog video signal received by the analog tuner to a digital video signal;    a video encoder which information-compresses the digital video signal converted by the video A/D converter;    an audio A/D converter which converts the analog audio signal received by the analog tuner to a digital audio signal;    an audio encoder which information-compresses the digital audio signal converted by the audio A/D converter;    a second clock generator which generates an internal clock used by the video encoder and audio encoder;    a multiplexer which multiplexes at least a compressed video signal compressed by the video encoder and a compressed audio signal compressed by the audio encoder, to produce a signal having the packet form;    a recording selection unit which selects the digital signal received by the digital broadcasting receiver or the digital signal multiplexed by the multiplexer;    a clock selecting unit which outputs a selected one of the clock generated by the first clock generator or the internal clock generated by the second clock generator;    a recording and playback unit which records and reproduces the digital signal selected by the recording selection unit; and    wherein, when recording, the digital signal recording and playback device is operable in a first recording mode in which the received digital signal is recorded and in a second recording mode in which the multiplexed digital signal is recorded, and the clock selecting unit selects the clock generated by the first clock generator unit in the first recording mode and selects the internal clock in the second recording mode.    
   
   
       5 . The digital recording and playback device according to  claim 4 , wherein the compressed video signal and compressed audio signal are signals in packet form having a predetermined byte number specified by a MPEG standard, and the multiplexer is operable to multiplex at least PAT packets and PMT packets.  
   
   
       6 . The digital recording and playback device according to  claim 5 , wherein the multiplexer multiplexes SI table information.