JP2004186997A - Digital recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apparently omit the processing time for recording and reproducing processing which is brought about at each time of signal switching resulting from channel selection of broadcast signals, without damaging functions of time shift viewing. <P>SOLUTION: When broadcast signals are received to view a broadcast, reception signals on a route 1 are selected by a signal selection part 3 and are subjected to reproducing and display processing by a reproducing and display part 4. In a recording and reproducing processing part 2, a transport stream (TS) is generated in an MPEG encoder 21 by MPEG encoding and is reproduced from a hard disk (HDD) 23 simultaneously with recording to the HDD 23, and decoding processing in an MPEG decoder 24 is performed in parallel. When time shift viewing is indicated by a user, a signal selector 31 selects signals on a route 2, and the TS from the HDD 23 is reproduced and displayed to start a time shift viewing state. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital recording / reproducing apparatus, and more particularly, to a digital recording / reproducing apparatus which records and reproduces an analog signal including a broadcast signal of a television broadcast as a digital signal and enables time-shift viewing.
[0002]
[Prior art]
In a digital recording / reproducing apparatus for recording and reproducing a received signal of a television broadcast or an analog signal from an external input from a video tape recorder, a digital broadcast receiver, or the like on a randomly accessible recording medium such as a hard disk or a DVD, conventionally, By simultaneously playing back the recorded signal while recording the video or audio currently being viewed by the user on a recording medium, the user can play back from that location after a pause or record a signal to a desired location. There is known a technology that enables time-shifted viewing by playing back a real-time viewing signal so as to follow the real-time viewing signal (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-51290
[Problems to be solved by the invention]
However, in order to record an analog signal such as a broadcast signal on a digital recording medium such as a hard disk, the analog signal is converted into a digital signal, and a recording data format required for reproduction, such as digital broadcasting, is used. It is necessary to convert the data into a transport stream (TS) of MPEG2 or a program stream (PS) of DVD standard. In such a conversion, for example, in channel switching at the time of viewing a television broadcast, a conversion time is required to perform the stream conversion for each channel, and it takes a longer time to select a channel compared to a normal television receiver. Causes waiting time stress due to channel selection. In addition, in order to record an external input, a switching time is similarly required to perform stream conversion every time the input is switched.
The present invention has been made in view of such circumstances, and has as its object to obviate the time required for selecting a broadcast signal or switching input of an external signal, and to enable time-shift viewing.
[0005]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first technical means is a digital recording / reproducing apparatus which receives a broadcast signal and performs recording and reproduction as a digital signal. A receiving unit comprising a digital converter for converting a signal into a digital signal; an encoding processing unit for encoding the digital signal; a recording system for recording the encoded digital signal; and a decoding unit for decoding the recorded digital signal A recording / reproducing processing unit comprising a decoding processor, and a reproducing unit for reproducing the decoded digital signal, and transmitting a digital signal from the receiving unit to the reproducing unit or the recording / reproducing processing unit. And selecting whether to transmit to the reproduction unit via the tuner, and to select a received signal from the tuner and a decoded reproduction signal recorded in the recording unit and decoded and reproduced. In, without impairing the function of time-shifted viewing, it is omitted apparently processing time for recording processing that occurs for each signal switching by tuning to a broadcast signal.
[0006]
The second technical means is the digital recording / reproducing apparatus according to the first technical means, wherein a digital signal from the receiving unit is transmitted to the reproducing unit or transmitted to the reproducing unit via the recording / reproducing processing unit. And a signal selector comprising a controller for controlling the signal selector and selecting the signal selector, at the time of receiving the broadcast signal, while transmitting a digital signal from the receiving unit to the reproduction unit to perform reproduction The signal is transmitted to the recording / reproducing processing unit and recorded in the recording system, and when the reproduction of the recording signal recorded in the recording system is instructed, the decoded signal from the recording / reproducing processing unit is selected by the signal selecting unit. Characterized in that the reproduction is performed by the reproduction unit, and the reception signal and the recording signal can be selected by instructing the selection of the recording signal recorded in the recording unit from the system controller to the signal selector. To.
[0007]
A third technical means is the digital recording / reproducing apparatus according to the first or second technical means, wherein the receiving section has an external input in addition to the tuner, and a broadcast signal from the tuner and a signal from the external input. Characterized by having a switching device for switching the input signal to a reproduction unit or a recording / reproduction processing unit at a subsequent stage.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples.
In a digital recording / reproducing apparatus that receives a broadcast signal and performs recording / reproduction, a hard disk, a DVD, or the like can be considered as a randomly accessible digital recording medium for enabling time-shift viewing, but in the following description of the embodiments, It is assumed that a digital recording / reproducing apparatus including a hard disk is used, and a broadcast input to the system is an NTSC television broadcast. The encoding for digitally recording the broadcast signal is provided with MPEG2, which is a video / audio encoding technique employed in digital BS broadcasting or digital CS broadcasting.
[0009]
FIG. 1 is a system block diagram illustrating a digital recording / reproducing apparatus according to an embodiment.
A digital recording / reproducing apparatus according to an embodiment includes a receiving unit 1 that receives a television broadcast signal and converts an analog received signal into a digital signal, and a recording / reproducing processing unit that records and reproduces the received signal received by the receiving unit 1. 2, a signal selection unit 3 for switching between a signal input to the reproduction display unit 4 as a reception signal from the reception unit 1 and a recording / reproduction signal from the recording / reproduction processing unit 2, and selection by the signal selection unit 3. And a playback display unit 4 for displaying the reproduced video and audio signals.
[0010]
The receiving unit 1 includes a tuner 11 that receives a television broadcast signal, a digital conversion for encoding the received signal received by the tuner 11, a video signal and an audio signal, and converts the video signal into a luminance signal and a chrominance signal. And a three-dimensional YC separator 12 which separates the received signal into digital signals. The digitized received signal is transmitted to the signal selector 3 (path 1) and a recording / reproducing processing unit at a subsequent stage for recording. 2 (path 2).
[0011]
The recording / playback processing unit 2 is an MPEG encoder 21 that encodes a transport stream (TS), which is data for recording digitized video and audio signals, and controls recording and playback of the transport stream. A hard disk (HDD) system 22, a hard disk (HDD) 23 which is a digital recording medium of the hard disk system 22, and an MPEG decoder 24 for decoding a transport stream recorded on the hard disk 23 to reproduce the transport stream.
The hard disk system 22 has a function of outputting the recorded transport stream while recording the transport stream, thereby realizing data reproduction that enables time-shift viewing. The MPEG decoder 24 decodes the transport stream reproduced from the hard disk 23 to convert video and audio signals into signals to be reproduced and displayed.
[0012]
The signal selection unit 3 selects a signal to be transmitted to the reproduction unit from a digitized reception signal from the reception unit 1 or a decoded signal from the recording / reproduction processing unit 2 and a signal selector 31 for selecting a signal. It comprises a system controller 32 for controlling.
[0013]
The reproduction display unit 4 includes an NTSC encoder 41 for converting a decoded signal into an NTSC signal and a D / A converter (DAC) 42 for converting the NTSC signal from digital to analog, and sends the signal to a display device such as a monitor.
[0014]
FIG. 2 is a system block diagram showing signal paths during normal reception and viewing.
In the normal reception and viewing of a broadcast signal, among the broadcast signals received by the reception unit 1, the reception signal on the path 1 that does not pass through the recording / reproduction processing unit 2 is selected by the signal selection unit 3 and transmitted to the display / reproduction unit 4 for reproduction. Display processing is performed.
At the same time, in the recording / reproducing processing unit 2, a transport stream (TS) is generated by MPEG encoding by the MPEG encoder 21, and the transport stream (TS) is recorded on the hard disk (HDD) 23 via the hard disk system 22. A transport stream is output from the hard disk 23 via the hard disk 23, and decoding processing by the MPEG decoder 24 is performed in parallel.
[0015]
FIG. 3 is a system block diagram showing a signal path during time shift viewing.
Consider a case where a user instructs time-shift viewing. As a time shift viewing instruction, a pause is performed by a user's remote controller operation or main body button operation, and then a playback is performed, or a process of returning from the currently viewed viewing scene is performed, and a desired scene is executed. , The reproduction of which is started. At this time, in response to an instruction from the user, the system controller 32 of the signal selection unit 3 sends a control signal for selecting a decoded signal from the recording / reproduction processing unit 2 to the signal selector 31. Switches to the signal of path 2 shown in FIG. 3 according to the instruction. In the path 2, the transport stream recorded on the hard disk 23 recorded at the same time as the viewing is reproduced and displayed, and the time-shift viewing state starts.
[0016]
In the time-shift viewing state, for example, when an instruction to forcibly stop the time-shift viewing or a state in which the time-shift viewing has caught up to the real-time viewing state due to fast-forwarding of reproduction or the like, the system controller 32 sends a signal to the signal selector 31. On the other hand, a switching signal for normal viewing is transmitted to switch to a path for transmitting the reception signal from the path 1 shown in FIG. 2 to the reproduction display unit 4, encoding of the transport stream of the signal of the recording and reproduction processing unit 2, and the transport stream And reproduction and display of a signal that avoids the process of recording and outputting the transport stream and decoding the transport stream.
[0017]
FIG. 4 is a system block diagram showing a digital recording / reproducing apparatus having an external input.
As shown in FIG. 4, the receiving unit 1 includes a first external input 13 and a second external input 14 for receiving an input from an external device such as a video tape recorder or a digital broadcast receiver, in addition to the tuner 11.
In the embodiment shown in FIG. 4, the first external input 13 and the second external input 14 are connected in addition to the tuner 11, and input signals from these external inputs can be switched by the input switch 15.
At the time of normal viewing where normal reproduction processing is performed, signal switching is performed so that the signal is sent to the reproduction display unit 4 through the path 1. At the time of time-shift viewing, switching is made to transmit to the reproduction display unit 4 on the path 2 passing through the recording / reproduction processing unit 2 on the path 2. Further, when returning to the normal viewing mode, the signal is reproduced through the path 1.
Furthermore, when switching the reception signals of the tuner 11, the first external input 13, and the second external input 14, the switching is performed on the signal path of the path 1 in the normal viewing state.
[0018]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, in normal viewing of a broadcast signal, encoding of a received signal for recording and reproducing on a recording medium such as a hard disk for time shift viewing, recording and recording of the encoded signal on a hard disk or the like By switching only the signal input to the playback unit and performing playback display while performing processing for decoding, avoiding the recording / playback processing, the signal obtained by selecting a broadcast signal without impairing the function of time shift viewing and listening. The processing time for the recording / reproducing processing that occurs each time switching is performed can be apparently omitted.
Also, it is possible to reduce the recording / reproducing processing time for switching which occurs even when the signal of the external input is switched.
[Brief description of the drawings]
FIG. 1 is a system block diagram illustrating a digital recording / reproducing apparatus according to an embodiment.
FIG. 2 is a system block diagram showing signal paths during normal reception and viewing.
FIG. 3 is a system block diagram showing a signal path during time shift viewing.
FIG. 4 is a system block diagram showing a digital recording / reproducing apparatus having an external input.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Receiving part, 2 ... Recording / reproduction processing part, 3 ... Signal selection part, 4 ... Reproduction display part, 11 ... Tuner, 12 ... Three-dimensional YC separator, 13 ... 1st external input, 14 ... 2nd external input, 15 Input switcher, 21 MPEG encoder, 22 Hard disk (HDD) system, 23 Hard disk (HDD), 24 MPEG decoder, 31 Signal selector, 32 System controller, 41 NTSC encoder, 42 D / A converter (DAC).

Claims (3)

In a digital recording and reproducing apparatus that receives a broadcast signal and performs recording and reproduction as a digital signal,
A tuner that receives the broadcast signal and a receiving unit that includes a digital converter that converts the received signal into a digital signal; an encoding processing unit that encodes the digital signal; and a recording system that records the encoded digital signal. A recording / reproducing processing unit comprising a decoding processor for decoding the digital signal, and a reproducing unit for reproducing the decoded digital signal, and transmitting a digital signal from the receiving unit to the reproducing unit. A digital recording / reproducing apparatus for selecting whether to perform transmission to the reproducing section via the recording / reproducing processing section. The digital recording / reproducing apparatus according to claim 1,
A signal comprising a signal selector for selecting whether to transmit a digital signal from the receiving unit to the reproducing unit or transmitting the digital signal to the reproducing unit via the recording / reproducing processing unit, and a controller for controlling the signal selector. A receiving unit that, when receiving the broadcast signal, transmits a digital signal from the receiving unit to the reproducing unit to perform reproduction, and transmits the digital signal to the recording / reproducing processing unit to record the digital signal in the recording system; A digital recording / reproducing apparatus, wherein at the time of instructing reproduction of a recorded signal recorded in the digital recording / reproducing apparatus, the signal selecting section selects the decoded recording signal from the recording / reproducing processing section and reproduces the signal by the reproducing section. The digital recording / reproducing apparatus according to claim 1 or 2,
The digital recording / reproducing apparatus according to claim 1, wherein the receiving section has an external input in addition to the tuner, and further includes a switch for switching between a broadcast signal from the tuner and a signal from the external input.

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