JP2001128123A - Method and device for recording digital signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record contents of a bit stream even in the case that a maximum bit rate of a incoming bit stream exceeds a data recording rate of a recording mode. SOLUTION: If the maximum bit rate of a bit stream incoming from a digital interface Dio exceeds the data recording rate of the recording mode, input is forcibly switched to a first video signal input terminal Vin1 and a first sound signal input terminal Ain1, and an analog video/sound signal having the same contents as the bit stream is subjected to compression encoding in accordance with the data recording rate of the recording mode and is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal recording apparatus, and more particularly to a digital signal recording apparatus and a digital signal recording method capable of switching and recording an incoming digital video / audio signal and an analog video / audio signal.

[0002]

2. Description of the Related Art In recent years, with the digitization of television broadcasting by digital satellite broadcasting or the like, digitization of video signals is rapidly progressing. Under such circumstances, a digital signal recording / reproducing apparatus capable of recording / reproducing a digital video / audio signal has been developed and commercialized.

[0003] As one of such digital signal recording and reproducing devices, there is a recording and reproducing device of the D-VHS (registered trademark) system. The D-VHS recording / reproducing apparatus is a VH system widely used as an analog video tape recorder.
Using the mechanism system of the S (registered trademark) system recording / reproducing device,
A digital video signal can be recorded and reproduced. A digital video signal and a digital audio signal encoded by the MPEG (Moving Picture Experts Group) 2 method are converted into a bit stream based on the MPEG transport stream standard (hereinafter, referred to as an MPEG bit stream). Recording / reproduction in the form described below).

There are several types of D-VHS recording / reproducing devices, one of which is an incoming MP.
In addition to simply recording and playing back the EG bitstream,
Some of them can convert analog video signal and analog audio signal by analog input into MPEG bit stream and record it, and convert reproduced MPEG bit stream and output it as analog video signal and analog audio signal. is there.

FIG. 1 shows a digital interface and an analog input / output terminal which are provided with a digital interface and an analog input / output terminal, switch and record an incoming MPEG bit stream and an analog video / audio signal, and reproduce a reproduced MPEG bit stream. 1 shows a D-VHS recording / reproducing apparatus capable of outputting from a terminal.

[0006] The recording / reproducing apparatus shown in Fig. 1 will be briefly described. Vin1 and Vin2 are first and second video signal input terminals to which analog video signals are input from the outside, and a switch 10 is a first video signal input terminal. Either an analog video signal coming from the video signal input terminal Vin1 or an analog video signal coming from the second video signal input terminal Vin2 is selected and output.

[0007] The analog video signal from the switch 10 is A / D
The video signal is converted by the converter 11 into a digital video signal, and then the video processing unit 12 performs processing such as demodulation of the color signal. Then, the digital video signal in the form of the luminance signal and the color difference signal is
G2 compression encoding is performed.

[0008] On the other hand, Ain1 and Ain2 are first and second audio signal input terminals to which analog audio signals are input from outside, and the switch 14 is such that the switch 10 is connected to the first video signal input terminal Vin1. When an analog video signal is output, an analog audio signal from the first audio signal input terminal Ain1 is selectively output, and when the switch 10 outputs an analog video signal from the second video signal input terminal Vin2, An analog audio signal from the second audio signal input terminal Ain2 is selectively output.

[0009] The analog audio signal from the switch 14 is converted into a digital audio signal by an A / D converter 15, and further subjected to a compression encoding process of, for example, an MPEG1 audio layer 2 system by an audio processing unit 16. You.

[0010] The stream converter 17 generates an MPEG bit stream from the MPEG video signal from the MPEG encoder 13 and the MPEG audio signal from the audio processor 16. The MPEG bit stream from the stream converter 17 is then output to an interface ASIC 18 for signal switching.

[0011] Dio is a digital interface terminal based on the IEEE 1394 standard, and 19 is an IEEE 13 terminal.
A digital interface based on the 94 standard,
The MPEG bit stream coming from the outside is output to the interface ASIC 18 via the digital interface terminal Dio and the digital interface 19.

The interface ASIC 18 outputs the MPEG bit stream output from the stream converter 17 to the D-VHS signal processor 20 and the digital interface 19,
9 outputs the MPEG bit stream to the D-VHS signal processor 20 and the stream converter 17. Further, as described later, the D-VHS signal processing unit 20
When outputting the bit stream, the interface ASIC 18 transmits the bit stream to the digital interface 1.
9 and the stream converter 17.

When the interface ASIC 18 outputs the MPEG bit stream to the D-VHS signal processing unit 20, the D-VHS signal processing unit 20 adds a header and an error correction code according to the specification of the D-VHS, and obtains the data. The digital recording signal is output to the recording amplifier 21. Then, the digital recording signal via the recording amplifier 21 is recorded on the recording medium 22.

As described above, the recording / reproducing apparatus shown in FIG. 1 can record both an MPEG bit stream and an analog video / audio signal coming from the outside on the recording medium 22. When recording an MPEG bit stream coming from the outside, this video / audio signal can be output through an output path of an analog video / audio signal described later. When recording an analog video / audio signal coming from the outside, Can be output as an MPEG bit stream via a digital interface terminal Dio.

When a digital signal recorded on the recording medium 22 is reproduced, the digital reproduction signal from the recording medium 22 is transmitted through the reproduction preamplifier 23 to the reproduction processing unit 2.
4 and the reproduction processing unit 24 performs reproduction signal detection processing such as waveform equalization and Viterbi decoding.

The digital reproduction signal that has been processed by the reproduction processing unit 24 is subjected to error correction processing by the D-VHS signal processing unit 20, and an MPEG bit stream is extracted. The MPEG bit stream thus obtained is supplied to an interface ASIC 18, a digital interface 19, and a digital interface terminal D.
In addition to being output to the outside in the form of an MPEG bit stream via io, an MPEG video signal and an MPEG audio signal are extracted by the stream converter 17.

Here, the extracted MPEG video signal is M
Decompression processing is performed in the PEG decoder unit 25, and the digital video signal is restored. The digital video signal from the MPEG decoder unit 25 is further subjected to processing such as color signal modulation in the video processing unit 12, and the digital video signal output from the video processing unit 12 is converted into an analog video signal by the D / A converter 26. Is output from the video signal output terminal Vout.

On the other hand, the MPEG audio signal extracted by the stream converter 17 is subjected to decompression processing by the audio processor 16 and then converted to an analog audio signal by the D / A converter 27, and the audio signal output terminal Output from Aout. In this manner, a digital reproduction signal reproduced from the recording medium 22 can be output in the form of an MPEG bit stream or an analog video / audio signal.

The components shown above are connected to the microcomputer 28 via a bus (not shown), and the microcomputer 28 controls each component. In FIG. 1, the MPEG encoder unit 13 and the MPEG decoder unit 25 are shown as separate components, but an internal memory for storing video data,
Basic algorithms such as DCT (Discrete Cosine Transform) are partially used in these configurations, and the circuit configuration is downsized.

Next, a recording mode in the D-VHS recording / reproducing apparatus shown in FIG. 1 will be described. In the recording / reproducing apparatus, a plurality of different data recording rates can be set according to the traveling speed of the recording medium 22. Yes, when recording in standard mode (hereinafter referred to as STD mode),
A bit stream of up to 14.1 Mbps can be recorded as main data, and a low-speed mode (hereinafter, referred to as a main data).
When recording in the LS mode, a bit stream up to 4.7 Mbps can be recorded as main data.

Here, when a program based on CS digital broadcasting is recorded by the same recording / reproducing apparatus, the bit rate of the incoming MPEG bit stream is set to the data recording rate of the STD mode in most programs, although it differs depending on the content of the program. The recording time is much lower, and recording in this STD mode is possible, but the recording time per tape roll is shorter than in the LS mode. Therefore, when recording for a long time is desired even if the image quality is slightly deteriorated, recording in the LS mode is suitable.

If the bit rate of the program is always lower than the data recording rate of the LS mode, the program can be recorded in the LS mode. The incoming MPEG bit stream cannot be recorded in LS mode as it is.

[0023]

Here, since the MPEG encoder unit 13 is configured to perform a compression encoding process at a rate corresponding to a recording mode, the MPEG encoder 13 converts an MPEG bit stream coming from a digital interface terminal Dio into an MPEG bit stream. A method is considered in which the decompression process is performed once by the decoder unit 25 and the compression encoding process is performed again by the MPEG encoder unit 13 in accordance with the recording mode. However, when the decompression process and the compression process are performed simultaneously as described above, the MPEG encoder unit 13 and the MPEG decoder unit 25.

For example, in the compression / expansion processing of the MPEG system, since the compression / expansion processing using the correlation between a plurality of frames is performed, a large-scale internal memory is required. This also makes it difficult to share the MPEG encoder 13 and the MPEG decoder 25.

The MPEG encoder 13 and the MPEG
There is also a method in which a part of the compression / decompression processing circuit in the decoder unit 25 is replaced with software, and the microcomputer 28 processes this. However, when the compression processing and the decompression processing are performed at the same time, the processing load on the microcomputer 28 is reduced. big,
There is a problem that it is difficult to reduce the price of the device.

[0026]

According to the present invention, there is provided a digital signal recording apparatus, comprising: an incoming first bit stream; and a second bit stream obtained by compressing and encoding an incoming analog signal. In the recording mode, the maximum bit rate of the first bit stream in the recording mode is set based on identification information from a device that outputs the first bit stream. It is determined whether there is a possibility of exceeding the data recording rate. If it is determined that there is no possibility that the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode, the 1 bit stream, and the maximum bit rate of the first bit stream is data recording in the recording mode. If it is determined that there is a possibility of exceeding the number of bits, or if it is impossible to determine, a second bit stream having video information having the same content as the video information forming the first bit stream is recorded. It is characterized by the following.

Further, the digital signal recording apparatus according to the present invention selectively selects one of an incoming first bit stream and a second bit stream obtained by compressing and encoding an incoming analog signal. In a digital signal recording apparatus capable of recording on a recording medium, at least means for comparing a maximum bit rate of a first bit stream with a data recording rate in a recording mode is provided, wherein the maximum bit rate of the first bit stream is When the data recording rate in the recording mode is exceeded, a second bit stream having video information having the same content as the video information forming the first bit stream is recorded.

[0028] Also, in the digital signal recording apparatus according to the present invention, the first connection terminal into which the first bit stream is input from an external device is the same as the video information forming the first bit stream from the external device. A second connection terminal for receiving an analog video signal having video information of the content,
When the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode,
A second bit stream obtained by compressing and encoding an analog video signal from the second connection terminal is recorded.

[0029] In the digital signal recording apparatus according to the present invention, the second connection terminal is a preset one of a plurality of analog connection terminals to which an analog video signal is input. It is a feature.

[0030] Further, the digital signal recording apparatus according to the present invention, when the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode, an analog video signal from the second connection terminal and A third bit stream is generated based on audio information extracted from the first bit stream, and the third bit stream is recorded.

Further, the digital signal recording method according to the present invention selectively selects one of an incoming first bit stream and a second bit stream obtained by compressing and encoding an incoming analog signal. In a digital signal recording method for recording on a recording medium, there is a possibility that a maximum bit rate of the first bit stream exceeds a data recording rate in the recording mode based on identification information from a device that outputs the first bit stream. It is determined whether or not there is, and if it is determined that there is no possibility that the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode, the first bit stream is recorded. The maximum bit rate of the first bit stream may exceed the data recording rate in the recording mode. When it is determined or when it is impossible to determine, a second bit stream having video information having the same content as the video information forming the first bit stream is recorded.

Further, the digital signal recording method according to the present invention selectively selects one of an incoming first bit stream and a second bit stream obtained by compressing and encoding an incoming analog signal. In a digital signal recording method for recording on a recording medium, a maximum bit rate of a first bit stream is compared with a data recording rate in a recording mode, and the maximum bit rate of the first bit stream is set to a data recording rate in the recording mode. In the case where the number of video information exceeds the second bit stream, a second bit stream having video information having the same content as the video information forming the first bit stream is recorded.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital signal recording apparatus and a digital signal recording method according to the present invention are provided in a digital signal recording apparatus capable of switching and recording a digital video signal and an analog video signal.
When the maximum bit rate of the G bit stream exceeds the data recording rate, the G bit stream is recorded using an analog video signal from an analog input terminal. The details will be described below.

Here, the digital signal recording apparatus and the digital signal recording method according to the present invention are described with reference to FIG.
Since a case where the present invention is applied to a VHS recording / reproducing apparatus will be described as an embodiment, the configuration of a digital signal recording apparatus according to the present invention is the same as the configuration shown in FIG.

FIG. 2 shows a digital signal recording apparatus according to the present invention, that is, a D-VHS recording / reproducing apparatus 100 and an external device 200 such as a digital CS tuner capable of outputting an MPEG bit stream and an analog video / audio signal. Here, a digital interface terminal Dio between the recording / reproducing apparatus 100 and the external device 200 is connected by a cable based on the IEEE1394 standard, and a video signal output terminal Vout and an audio signal of the external device 200 are connected. The output terminal Aout is connected to the first video signal input terminal Vin1 and the first video signal input terminal Ain2 of the recording / reproducing apparatus 100 by an analog cable.

Although FIG. 1 shows the video signal output terminal Vout and the audio signal output terminal Aout, these terminals are not shown in the recording / reproducing apparatus 100 of FIG. Further, here, the analog video signal is converted into one by a form of a composite video signal in which a luminance signal and a color signal are mixed.
Although the video signal is transmitted by an analog cable, the recording / reproducing apparatus 100 and the external device 200 are provided with terminals for separating and inputting / outputting the video signal.
When video signal components such as a luminance signal and a color difference signal can be input and output separately, such an input / output terminal can be connected with an analog cable to transmit an analog video signal.

With the above connection, the MPEG bit stream output from the external device 200 enters the recording / reproducing apparatus 100 via the digital interface terminal Dio shown in FIG. The signal and the analog audio signal enter the recording / reproducing apparatus 100 via the first video signal input terminal Vin1 and the first audio signal input terminal Ain1.

FIG. 3 shows the MP output from the external device 200.
5 is a flowchart for explaining an input switching process when recording an EG bit stream by the recording / reproducing apparatus 100.
Here, the user sets the recording / reproducing apparatus 100 to the recording standby mode (F01), selects which input signal is to be recorded, and selects the recording mode.

That is, the user selects whether to record the MPEG bit stream coming in through the digital interface terminal Dio or to record the analog video / audio signal coming in through the analog input terminal. One of the STD mode and the LS mode is selected as the mode.

[0040] Then, the recording / reproducing apparatus 100 controls the M which the user enters via the digital interface terminal Dio.
It is confirmed whether the PEG bit stream has been selected or the analog video / audio signal input via the analog input terminal has been selected (F02). If the recording of the analog video / audio signal has been selected, N is set. The processing is terminated, but if the recording of the MPEG bit stream is selected, the result is Y and the recording mode is further confirmed (F0
3).

When the user selects the LS mode as the recording mode, the maximum bit rate Ri of the MPEG bit stream input via the digital interface terminal Dio and the data recording rate Rm in the LS mode are further determined. Compare (F04), incoming MP
If the maximum bit rate Ri of the EG bit stream exceeds the data recording rate Rm, the first video signal input terminal Vin1 and the first audio signal input terminal Ain1
Microcomputer 2 to record analog video and audio signals from
8 controls each component, and ends the processing (F06).

Here, if the maximum bit rate Ri of the incoming bit stream cannot be confirmed in the recording / reproducing apparatus 100, the identification from the external device 100 which is outputting the bit stream instead of the processing in F04. The input may be switched based on the information.

For example, when the external device 100 outputting the MPEG bit stream is a digital CS tuner as described above, the maximum bit rate Ri may exceed the data recording rate Rm in the LS mode.
If the external device 100 is a D-VHS recording / reproducing device and outputs an MPEG bit stream in the LS mode, there is no possibility that the maximum bit rate Ri exceeds the data recording rate Rm in the LS mode. .

Therefore, if the maximum bit rate Ri of the incoming bit stream cannot be confirmed in the recording / reproducing apparatus 100, the external device 10 that outputs the bit stream
The input can be switched based on identification information including device information from 0, recording mode information, and the like. That is, if the maximum bit rate Ri may exceed the data recording rate Rm in the LS mode, Y is determined in F04.
If there is no possibility that the maximum bit rate Ri exceeds the data recording rate Rm in the LS mode,
04 can be N. When it is not possible to determine whether or not the maximum bit rate Ri may exceed the data recording rate Rm in the LS mode based on the identification information, Y is determined in F04.

As shown in FIGS. 1 and 2, the recording / reproducing apparatus 100 has a second video signal input terminal Vin2 in addition to the first video signal input terminal Vin1 and the first audio signal input terminal Ain1. And a second audio signal input terminal Ain2
Here, the first video signal input terminal Vin1 and the first audio signal input terminal Ain1 are provided with:
Such an input switching process is performed on the assumption that video and audio information having the same content as the MPEG bit stream coming in via the digital interface terminal Dio is coming in.

As described above, the first video signal input terminal Vin1 and the first audio signal input terminal Ain1 of the recording / reproducing apparatus 100 are connected to the digital interface terminal Di.
It is set as a special input terminal to be switched when the maximum bit rate of the MPEG bit stream input via o exceeds the data recording rate in the recording mode.

Here, when it is confirmed at F02 in FIG. 3 that the user has selected the analog video / audio signal coming in through the analog input terminal, that is, when N is reached and the process is terminated, the user The analog video signal and the analog audio signal from the selected video signal input terminal and audio signal input terminal are compression-encoded according to the data recording rate of the selected recording mode.

The interface ASIC 18 outputs the MPEG bit stream from the stream converter 17 to the D-VHS signal processor 20 and the digital interface 19, and stores the MPEG bit stream on the recording medium 22 in the recording mode selected by the user. Is recorded, and an MPEG bit stream is output to the outside via the digital interface terminal Dio.

[0049] Further, at F03 in FIG.
If it is confirmed that the D mode has been selected, the MPEG bit stream from the digital interface terminal Dio is transmitted via the interface ASIC 18 to the D-VHS signal processor 20 and the stream converter 17.
Is output to the recording medium 22 in the STD mode.
The EG bit stream is recorded, and an analog video signal and an analog audio signal are output via the video signal output terminal Vout and the audio signal output terminal Aout.

At F04 in FIG. 3, the incoming MP
If it is confirmed that the maximum bit rate Ri of the EG bit stream is equal to or lower than the data recording rate Rm in the LS mode, or if there is no possibility that the maximum bit rate Ri exceeds the data recording rate Rm in the LS mode, the digital interface The MPEG bit stream from the terminal Dio is output to the D-VHS signal processing unit 20 and the stream conversion unit 17 via the interface ASIC 18, and is stored in the recording medium 22 in the LS mode.
The bit stream is recorded, and an analog video signal and an analog audio signal are output via the video signal output terminal Vout and the audio signal output terminal Aout.

Also, at F04 in FIG. 3, the incoming MP
If it is determined that the maximum bit rate Ri of the EG bit stream exceeds the data recording rate Rm in the LS mode, or if the maximum bit rate Ri may exceed the data recording rate Rm in the LS mode, the first The analog video signal and the analog audio signal from the video signal input terminal Vin1 and the first audio signal input terminal Ain1 are compression-encoded according to the data recording rate in the LS mode.

Then, the interface ASIC 18 cuts off the MPEG bit stream from the digital interface terminal Dio and converts the MPEG bit stream from the stream converter 17 into a D-VHS signal processor 20.
Output to Therefore, the MP from the stream conversion unit 17
The EG bit stream is recorded on the recording medium 22 in the LS mode.

As described above, in the digital signal recording apparatus and digital signal recording method according to the present invention, the incoming MP
Even if the maximum bit rate of the EG bit stream exceeds the data recording rate in the recording mode, the input is switched to an analog video / audio signal having the same video / audio information as the incoming MPEG bit stream,
This analog video / audio signal is compression-encoded and recorded according to the data recording rate in the recording mode.

Therefore, the MPEG encoder unit 13 and the MPEG
There is no need to operate the decoder unit 25 at the same time, and there is no particular problem even if the configuration of the internal memory and the like in both circuits is shared.

In the above description, when the maximum bit rate of the incoming MPEG bit stream exceeds the data recording rate in the recording mode, the incoming analog video signal and analog audio signal are selected and recorded. Although an example has been described, for example, an incoming analog video signal and an incoming audio signal as an MPEG bit stream from the outside may be recorded on the recording medium 22.

At this time, the digital interface terminal Di
o, the MPEG bit stream coming from the digital interface 19, the interface ASIC1
8 is output to the stream conversion unit 17 via the MPEG bit stream.
Only the EG audio signal is extracted and output to the audio processing unit 16.

[0057] The audio processing unit 16 includes the stream conversion unit 1
The MPEG audio signal is temporarily decompressed, and the compression encoding process is performed again in accordance with the data recording rate in the recording mode. Even if the compression encoding process and the decompression process can be performed at the same time, the circuit scale does not increase so much.

Then, the M obtained from the incoming analog video signal
By generating an MPEG bit stream from the PEG video signal and the MPEG audio signal that has been compression-encoded by the audio processing unit 16 and recording the MPEG bit stream on the recording medium 22, deterioration of sound quality due to recording of audio information is minimized. be able to.

The incoming analog video signal and M
When recording the incoming audio signal as a PEG bit stream on the recording medium 22, the MPEG audio signal extracted by the stream conversion unit 17 is temporarily processed by the audio processing unit 16.
The MPEG audio signal extracted by the stream converter 17 and the MPEG video signal obtained from the incoming analog video signal are output to the M
It goes without saying that a PEG bit stream may be generated.

In the above description, an example is shown in which only the recording / reproducing device 100 and the external device 200 are connected. However, more devices may be connected. At this time, the analog output of any device connected by the digital interface is determined by using information such as the type of the connected device, the maker code, and the serial number transmitted between the devices via the digital interface terminal and the digital interface.
Which analog input terminal of the recording / reproducing apparatus 100 corresponds to which is registered in advance at the time of connection, so that the present invention can be applied to inputs from a plurality of external devices based on this registration information. Absent.

[0061] Further, even if the maximum bit rate of the MPEG bit stream exceeds the data recording rate in the recording mode and the device outputting the MPEG bit stream cannot output an analog signal, the user is instructed. A message urging the user to change the recording mode may be displayed, or a message indicating that recording cannot be performed may be displayed.

Further, in the recording / reproducing apparatus of the D-VHS system, there are several recording modes having different data recording rates in addition to the above-mentioned STD mode and LS mode, and the present invention is applied to these recording modes. It goes without saying that it may be applied.

[0063]

According to the digital signal recording apparatus and the digital signal recording method of the present invention, the maximum bit rate of the incoming first bit stream may exceed or possibly exceed the data recording rate in the recording mode. In the case, the second by the analog input having the same video information as the video information forming the first bit stream
Therefore, even when the data recording rate in the recording mode is lower than the incoming first bit stream, video information having the same content as the video information in the first bit stream can be recorded.

In the digital signal recording apparatus, a decoder for outputting the incoming first bit stream as an analog signal is mounted. However, since the encoder and the decoder are not operated at the same time, both circuits are used. , The configuration of the internal memory and the like can be shared, and the circuit scale can be reduced.

When a third bit stream is generated and recorded based on an analog video signal from the second connection terminal and audio information extracted from the first bit stream,
Deterioration of sound quality due to recording of audio information can be minimized.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a configuration of a D-VHS recording / reproducing apparatus.

FIG. 2 is a diagram showing a state in which a recording / reproducing device and an external device are connected.

FIG. 3 is a flowchart illustrating switching of input when recording an MPEG bit stream.

[Explanation of symbols]

 10, 14 ... Switching device 11, 15 ... A / D converter 12 ... Video processing unit 13 ... MPEG encoder unit 16 ... Audio processing unit 17 ... Stream conversion unit 18 ... Interface ASIC 19 ... Digital interface 20 ... D-VHS signal processing Unit 21 Recording amplifier 22 Recording medium 23 Reproduction amplifier 24 Reproduction processing unit 25 MPEG decoder unit 26, 27 D / A converter 28 Microcomputer Dio Digital interface terminal Vin1, Vin2 Video signal input terminal Vout Video signal output terminal Ain1, Ain2 ... audio signal input terminal Aout ... audio signal output terminal

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Naofumi Nakano 3-12-13 Moriyacho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Within Japan Victor Company of Japan (72) Inventor Yutaka Ichii 3-chome Moriyacho, Kanagawa-ku, Yokohama-shi, Kanagawa 12 J Victor Co., Ltd. F term (reference) 5C053 FA22 GA11 GB11 GB22 GB37 JA05 LA14 5C059 KK34 MA00 MA23 SS11 SS30 TA60 TC37 TD11 UA02

Claims (7)

[Claims] A digital signal capable of selectively recording, on a recording medium, one of an incoming first bit stream and a second bit stream obtained by compressing and encoding an incoming analog signal. In the recording apparatus, it is determined whether or not the maximum bit rate of the first bit stream may exceed the data recording rate in the recording mode based on identification information from a device that outputs the first bit stream. If it is determined that there is no possibility that the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode, the first bit stream is recorded and the first bit stream is recorded.
If it is determined that there is a possibility that the maximum bit rate of the bit stream may exceed the data recording rate in the recording mode, or if the maximum bit rate cannot be determined, the same content as the video information forming the first bit stream is used. A digital signal recording device for recording a second bit stream having the following video information. 2. A digital signal capable of selectively recording, on a recording medium, one of an incoming first bit stream and a second bit stream obtained by compressing and encoding an incoming analog signal. The recording apparatus, further comprising: means for comparing a maximum bit rate of a first bit stream with a data recording rate in a recording mode, wherein the maximum bit rate of the first bit stream exceeds a data recording rate in the recording mode. Is
A digital signal recording apparatus for recording a second bit stream having video information having the same content as the video information forming the first bit stream. 3. A first connection terminal for receiving a first bit stream from an external device, and an analog video signal having video information having the same content as video information forming the first bit stream from the external device. An incoming second connection terminal; and an encoder for compressing and encoding an analog video signal from the second connection terminal, wherein a maximum bit rate of the first bit stream is a data recording rate in the recording mode. If
3. The digital signal recording apparatus according to claim 2, wherein a second bit stream obtained by compressing and encoding the analog video signal from the second connection terminal by the encoder is recorded. 4. The digital terminal according to claim 3, wherein the second connection terminal is a preset one of a plurality of analog connection terminals to which an analog video signal is input. Signal recording device. 5. When the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode, video information obtained by compressing and encoding an analog video signal from the second connection terminal by the encoder. 5. The digital signal recording apparatus according to claim 3, wherein a third bit stream is generated based on the first bit stream and audio information extracted from the first bit stream, and the third bit stream is recorded. 6. A digital signal recording method for selectively recording, on a recording medium, one of an incoming first bit stream and a second bit stream obtained by compressing and encoding an incoming analog signal. Determining whether a maximum bit rate of the first bit stream is likely to exceed a data recording rate in the recording mode based on identification information from a device that outputs the first bit stream; If it is determined that there is no possibility that the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode, the first bit stream is recorded and the first bit stream is recorded.
If it is determined that there is a possibility that the maximum bit rate of the bit stream may exceed the data recording rate in the recording mode, or if the maximum bit rate cannot be determined, the same content as the video information forming the first bit stream is used. And recording a second bit stream having the following video information. 7. A digital signal recording method for selectively recording one of an incoming first bit stream and a second bit stream obtained by compressing and encoding an incoming analog signal on a recording medium. Comparing the maximum bit rate of the first bit stream with the data recording rate in the recording mode, and if the maximum bit rate of the first bit stream exceeds the data recording rate in the recording mode, A digital signal recording method characterized by recording a second bit stream having video information having the same contents as video information forming a stream.