JPH02279078A - Television signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain an output audio signal with high quality by recording an audio data in a received television signal onto a digital audio tape recorder (DAT) while keeping a digital signal, reproducing the signal from the DAT so as to obtain an audio output. CONSTITUTION:A video signal separated by a decoder 3 is recorded on a VTR 5 and time information of a time information generating section 17 is recorded on the VTR 5 by a 1st time information recording means. Moreover, an audio data in a bit rate A separated by the decoder 3 is converted into a data in a bit rate B with a data converter 14 and recorded on the DAT 15. In this case the time information of the time information generating section 17 is recorded on the DAT 15 by the 2nd time information recording means. A synchronizing means synchronizes the reproduced output of the VTR 5 and the DAT 15 based on the time information recorded on the VTR 5 and the DAT 15 at the reproduction of the VTR 5 and the DAT 15. Thus, audio and video signal with high quality are recorded and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a television signal recording and reproducing apparatus capable of outputting high quality audio in synchronization with video output.

[Prior art] In high-definition television broadcasting, the video signal transmission method is considered to be a method in which a carrier wave is FM (frequency modulated) using an analog video signal, and the audio signal transmission method is to convert the analog audio signal into PCM (pulse modulation). A method is being considered in which subcarriers are modulated using code modulated digital signals.

For this reason, a system as shown in FIG. 2 can be considered as a recording and reproducing apparatus for television signals for high-definition television. That is, the TV signal received by the parabolic antenna (1) is converted to M U S E (
Multiple 5ub-Nyquist Sa+a
pling encoding) decoder (3), and the MUSE decoder (3) converts the analog video signal and digital audio data (e.g. PCM signal)
This video signal and a signal obtained by converting the audio data into an analog audio signal by an audio decoder (4) are sent to a high-definition television VTR (video tape recorder) (
5) and reproduced from this VTR (5), the video and audio signals are sent to a TV (television) receiver (6).
output to play video and audio.

[Problems to be Solved by the Invention] However, in the television signal recording and reproducing apparatus shown in FIG. 2, the audio decoder (4) converts audio data into an analog audio signal and records this on the VTR (5). ,
Since reproduction is performed from this VTR (5), there is a problem in that recording and reproduction in the VTR (5) causes deterioration in sound quality. In addition, DAT records and plays back audio data, which is a digital signal, as it is.
(Digital audio tape recorder), but since the bit rates are different, there is a problem that it cannot be used as is for recording and reproducing audio data for high-definition television, etc.

The present invention was made in view of the above-mentioned problems.

The purpose of the present invention is to provide a television signal recording and reproducing device that can record and reproduce high-quality audio and video by using DAT for recording and reproducing audio data, and that also prevents a lag between audio output and video output during reproduction. It is something to do.

[Means for Solving the Problems] The present invention uses a decoder to separate a received television signal into an analog video signal and digital audio data at a bit rate A, records this video signal on a VTR, and reads the video signal from the VTR. In a device that outputs a reproduced video signal to a video display device to display video, the bit rate B(B)A
), converts the audio data of the bit rate A to audio data of the bit rate B and outputs it to the DAT, and converts the reproduced data of this DAT to the audio data of the bit rate A. A data converter that converts and outputs the data, an audio output device connected to the output side of the data converter via an audio decoder,
a time information generating section that outputs time information; a first time information recording means that records the time information of the time information generating section on the VTR when recording a video signal on the VTR; a second time information recording means for recording time information of a time information generating section on the DAT;
The VTR and DA based on the time information recorded in the AT
The apparatus is characterized by comprising a synchronizing means for synchronizing the reproduction output of the T.

[Operation] The video signal separated by the decoder is recorded on a VTR. At this time, the time information of the time information generating section is recorded on the VTR by the first time information recording means. Further, the audio data of bit rate A separated by the decoder is converted to data of bit rate B by a data converter, and is recorded on the DAT. At this time, the time information of the time information generating section is recorded on the DAT by the second time information recording means. The synchronization means is used to synchronize the VT during playback of the VTR and DAT.
VTR and D based on the time information recorded in R and DAT.
Synchronize the AT playback output.

[Embodiment] FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 2 are given the same reference numerals. In FIG.

(1) is a parabolic antenna for receiving high-definition television broadcasting, etc. This parabolic antenna (1) is connected to a MUS E (Multip) via a converter (2).
le Sub-Nyquit Sampling E
ncoding) decoder (3). The output line (11) that outputs analog video signals from the MUSE decoder (3) is connected to a VTR for high-definition television.
(Video tape recorder) (5) is connected to the recording signal input side, and a video display device (12) such as a television receiver is connected to the playback signal output side of this VTR (5). An output line (13) for outputting digital audio data at a bit rate A (for example, A=1350 kbps) from the MUSE decoder (3) is coupled to the input side of a data converter (14). This data converter (14) adds predetermined additional bits (for example, 186 bits per 1 m5ec) to the audio data at bit rate A input via the output line (13) to convert the audio data to bit rate B (for example, B=1536 kbps). It is converted into audio data and output to a DAT (digital audio tape recorder) (15), and this DAT (1
A predetermined surplus bit is removed from the reproduced data in step 5), the data is inversely converted to audio data with a bit rate A, and the audio data is sent to the audio decoder (step 4).
). An audio output device (16) such as an audio system is coupled to the output side of the audio decoder (4).

(17) is a time information generating section that outputs time information based on a digital clock or the like. (18) is CPU (central processing unit), ROM (read-only memory), RAM (
This control section (18) is configured to output time information outputted from the time information generation section (17) as an analog signal when recording a video signal in the VTR (5). Said VTR (5)
a first time information recording means for recording on a part of the audio channel or video channel of the DA T (15);
17), a second time information recording means for recording the time information outputted from the DAT (15) as a digital signal in the additional bit part of the DAT (15), and the VTR (5) and D
A T (15) (7) Odor during playback, the above V T
R(5) and DAT(15)
(15) A synchronizing means for synchronizing the reproduction output.

Next, the operation of the above embodiment will be explained.

(b) During recording, a television signal such as high-definition television broadcasting is received by the parabolic antenna (1), and the received television signal is transmitted to the MFP via the converter (2).
When input to the USE decoder (3), an analog video signal is output to one output line (11) of the MUSE decoder (3), recorded on the VTR (5), and output to the other output line (13). outputs digital audio data at bit rate A, and converts it to bit rate B using the data converter (14).
is converted into audio data and recorded on the DAT (15). At this time, the first and second time information recording means of the control section (18) convert the time information output from the time information generation section (17) to the VTR (5) as an analog time signal.
DAT (15
) is recorded in the additional bit part, etc.

(b) During playback, the video signal recorded on the VTR (5) is output to the video display device (12) to display the video, and the bit rate B recorded on the DAT (15) is
The audio data is converted into audio data with bit rate A by the data converter (14), converted into an analog audio signal by the audio decoder (4), and then sent to the audio output device (1).
6) and the audio is output. At this time, the control unit (
The synchronizing means 18) synchronizes the playback outputs of the VTR (5) and DAT (15) based on the time signal recorded on the VTR (5) and the time data recorded on the DAT (15). . Therefore, there is no difference between the video output and the audio output.

In the above embodiment, the video display device and the audio output device are separate devices; however, the present invention is not limited to this, and may be used in combination with a TV (television) receiver (6) as shown in FIG. It's okay.

[Effects of the Invention] As described above, the television signal recording and reproducing device according to the present invention records the audio data of the received television signal as a digital signal on the DAT, and reproduces it from the DAT to output audio. As a result, the output audio can be of higher quality than the conventional example in which audio data is converted into an analog audio signal, recorded on a VTR, and reproduced from the VTR as audio output. Furthermore, by providing a time information generating section, first and second time information means, and a synchronizing means, the video output and the audio output are synchronized, so that the deviation between the video output and the audio output during playback is prevented. Does not occur.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a television signal recording/reproducing apparatus according to the present invention, and FIG. 2 is a block diagram showing a conventional example. (3)...MUSE decoder, (4)...Audio decoder, (5)...VTR, (12)...Video display equipment, (14)...Data converter, (15)...
-DAT, (16)...Audio output device. (17)...Time information generation unit, (18)...Control unit, A, B...Data bit rate. Applicant: Fujitsu General Ltd.

Claims (1)

[Claims] (1) Separate the received television signal into an analog video signal and digital audio data at bit rate A using a decoder, record this video signal on a VTR, and record this video signal on a VTR.
In a device that outputs a video signal played from a TR to a video display device to display video, the bit rate B (B>A)
a DAT for recording and reproducing audio data of the bit rate A, converting the audio data of the bit rate A to audio data of the bit rate B and outputting it to the DAT, and converting the reproduced data of the DAT back to the audio data of the bit rate A. an audio output device connected to the output side of the data converter via an audio decoder; a time information generator that outputs time information; and a time information generator that generates the time information when recording video signals in the VTR. a first time information recording means for recording time information of the section on the VTR; a second time information recording means for recording time information of the time information generation section on the DAT when recording audio data on the DAT; and a synchronizing means for synchronizing the reproduction outputs of the VTR and DAT based on time information recorded in the VTR and DAT during reproduction of the DAT.