JPH11219564A - Recording device and recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that before-and-after coded data are overlapped at an edition point and to prevent occurrence of a large noise caused by that coded data is erroneously judged as LPCM at the time of reproduction, when a recording phase of coded data is deviated from a video phase. SOLUTION: A discriminating circuit 12 discriminates whether input audio information is LPCM or coded data. When it is coded data, it is synchronism- converted so that it is synchronized with frame synchronism of a video signal by a frame memory 11. When coded data is connected to LPCM and recorded in an audio signal recording region on a magnetic tape, a changeover switch 17 is controlled, and dummy data is recorded in the prescribed period after LPCM. Further, when reproduced audio information is coded data, an output processing circuit 61 is bypassed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device and a recording / reproducing device applicable to a device for recording, recording / reproducing, for example, video information and audio information such as a VTR.

[0002]

2. Description of the Related Art The present inventor has previously proposed an apparatus for encoding / decoding an audio signal synchronized with a video signal. This is because the PQ by linear quantization is used to enable recording of audio signals of more channels in the recording area of the existing two-channel PCM audio signal of the VTR.
Instead of a CM audio signal, it records encoded data compressed and encoded by MPEG or the like. The previous proposal adopts an existing digital audio I / F as a data I / F for transmitting encoded data, and absorbs a deviation at the time of reproduction at a boundary point of recording processing in video frame units. For this purpose, a process of packing encoded data in the time axis direction is performed.

FIG. 8 shows a VT usable for such signal processing.
FIG. 9 shows an outline of R, and FIG. In FIG. 8, 1 indicates a video input terminal, and 2 indicates an audio input terminal. FIG. 9 input from the audio input terminal 2
The audio signal A1 shown in C is supplied to a recording format conversion circuit 55 via an input processing circuit 54 such as a gain control. The audio signal A1 is shown in FIG.
Although shown in an analog waveform, for example, at a sampling frequency of 48 kHz, 2 bits generated by 16-bit linear quantization are used.
This is the PCM audio signal of the channel.

A video signal V1 shown in FIG. 9A, which is simultaneously input from the video input terminal 1, is supplied to a recording format conversion circuit 55 and also to a video synchronization separation circuit 50. In the video sync separation circuit 50,
From the video signal V1 to the video synchronization signal S1 shown in FIG. 9B
(A frame or a field period, hereinafter, only a frame will be described), and the synchronization signal S1 is supplied to the recording format conversion circuit 55 and the recording format reverse conversion circuit 60, respectively.

[0005] The recording format conversion circuit 55 combines audio / video signals in video frame units based on the synchronization signal S1 separated by the video synchronization separation circuit 50. In the recording format conversion circuit 55, for example, a video signal is digitized and compressed as necessary. Further, the PCM audio signal is converted by the recording format conversion circuit 55 so as to be recorded in, for example, a PCM audio recording area. Then, as shown in FIG. 9D, a recording signal S2 in which the video signal (usually a digital signal) and the PCM audio signal are combined in video frame units is generated. The output signal S2 of the recording format conversion circuit 55 is recorded on the magnetic tape via the recording amplifier 56 and the recording head 57.

At the time of reproduction, a reproduction output is supplied to a recording format reverse conversion circuit 60 via a reproduction head 58 and a reproduction amplifier 59. Recording format reverse conversion circuit 60
Separates the video signal and the audio signal based on the video synchronization signal S1 separated by the video synchronization separation circuit 50. The separated video signal is taken out as a reproduced video signal V2 via the video output terminal 4. Also, the separated audio signal is gain control,
The signal is supplied to an output processing circuit 61 that performs processes such as phase adjustment and concealment, and is converted into a reproduced audio signal A2. The reproduced audio signal A2 is taken out via the output terminal 3.

The video synchronizing signal S1 separated by the video synchronizing separation circuit 50 is simultaneously output to the servo circuit 51.
Is also supplied. The servo circuit 51 controls the rotation of the rotary drum 52 based on the tape position detected by the control head 53 and the video synchronizing signal S1, so that the recording / reproducing track on the tape has a video frame unit break. . That is, the signals processed collectively for each video frame in the recording format conversion circuit 55 and the recording format reverse conversion circuit 60 are associated with the tracks on the tape by the servo circuit 51 for recording / reproduction. Thus, the input audio signal A1 is recorded and reproduced in video frame units.

In the VTR according to the above-mentioned proposal, encoded data obtained by a compression encoder is supplied to an audio input terminal 2 instead of a PCM audio signal. In this case, the encoded data is AES (Audio Engineering Soc).
I / F (interface) specified in 3-1992
Format (hereinafter simply referred to as AESI / F format). The encoder compresses a PCM audio signal having more than two channels by, for example, MPEG audio. If the compression ratio is 1 / N, encoded data of (2 × N) channels can be recorded in the PCM audio signal recording area on the tape. As disclosed in the earlier application, the encoded data and the video frame are synchronized.
Also, the encoded data is packed in the time axis direction. The reproduced encoded data is output to the decoder for decompression in the AES format.

As described above, since the video frame and the coded data are synchronized, it is possible to prevent the data units of the coded data from being overlapped at the editing point when the video frame is edited. Further, in the encoded data packed in the time axis direction, the shift of the reproduction phase at the time of editing / dubbing is absorbed by invalid data before and after the video synchronization signal S1.

[0010]

As described above, there are two playback VTRs which have a synchronous relationship with a video signal and generate encoded data packed in the time axis direction, and playback video from each VTR. A switcher for switching signals,
2 for expanding the playback encoded data from each VTR
One decoder, a mixer to which the output of each decoder is supplied, an encoder for compressing the output of the mixer, and a recording VTR for recording the output of the switcher and the output of the encoder
And an editing system for controlling the entire system.

In this editing system, the recording VTR
May be out of phase with the video signal supplied to the. As a cause of the recording phase shift, firstly, there is an audio reproduction phase adjustment function of the output processing circuit of the reproduction VTR, and secondly, there is a possibility of passing through an external device (for example, a mixer). . In either case, the recorded audio phase deviates from the video synchronizing signal by a certain degree or more, and the amount of this deviation exceeds the preceding and following invalid data periods. There is a problem that they overlap and become invalid during reproduction.

In the above-mentioned editing system, when the recording VTR is an existing VTR and LPCM (linear quantized audio data) is originally recorded in the audio area on the tape (as a base), When recording the edited coded data, the point where the LPCM is switched to the coded data occurs. Further, editing for connecting the LPCM and the encoded data may be performed. When such a tape is reproduced, there is a period during which the encoded data is determined to be mistaken for the LPCM due to a delay in detecting whether the data is the LPCM or the encoded data. as a result,
Muting does not work and there is a problem that large noise is generated due to reproduction of encoded data.

Accordingly, an object of the present invention is to provide a recording apparatus and a recording / reproducing apparatus which can prevent data before and after at an editing point from being overlapped at the time of editing, even when the recording audio phase deviates from the video synchronizing signal by a certain degree or more. Sometimes.

Another object of the present invention is to prepare a tape in which LPCM and encoded data are mixedly recorded in an audio area, and to reproduce encoded data by L during reproduction.
An object of the present invention is to provide a recording apparatus and a recording / reproducing apparatus which can prevent generation of a large noise even when erroneously determined as PCM.

[0015]

SUMMARY OF THE INVENTION To solve the above-mentioned problems, a first aspect of the present invention is a recording apparatus for recording video information and digital audio information on a recording medium. Detecting means for detecting a first synchronization corresponding to the encoded data from encoded data generated by compression-encoding the data, and detecting means for detecting a second synchronization of the frame or field from the input video signal; A synchronous conversion unit for converting the encoded data from the first synchronization to the second synchronization based on the first synchronization and the second synchronization relationship, and a synchronization conversion unit for synchronizing the encoded data with the second synchronization. Recording means for recording the encoded data and the video signal on a recording medium.

According to a second aspect of the present invention, in a recording apparatus for recording video information and digital audio information on a recording medium, a video input terminal to which a video signal is supplied, quantized audio data, An audio input terminal to which one of encoded data generated by compressing and encoding the encoded audio data is input;
Discriminating means for discriminating between quantized audio data and encoded data; detecting means for detecting a first synchronization corresponding to the encoded data from the encoded data; and a second synchronization of the frame or field from the input video signal. Detecting means for detecting, synchronous conversion means for converting the encoded data from the first synchronization to the second synchronization based on the first synchronization and the second synchronization relationship, Selecting means for selecting one of the quantized audio data and the encoded data synchronized with the second synchronization by the synchronization conversion means as audio information, and the audio information and the video signal selected by the selecting means. Recording means for recording the following.

According to a third aspect of the present invention, in a recording apparatus for recording video information and digital audio information on a recording medium, a video input terminal to which a video signal is supplied, quantized audio data, An audio input terminal to which one of encoded data generated by compressing and encoding the encoded audio data is input;
Discriminating means for discriminating between quantized audio data and encoded data; detecting means for detecting a first synchronization corresponding to the encoded data from the encoded data; and a second synchronization of the frame or field from the input video signal. Detecting means for detecting, synchronous conversion means for converting the encoded data from the first synchronization to the second synchronization based on the first synchronization and the second synchronization relationship, Selecting means for selecting, as audio information, one of the quantized audio data and the encoded data synchronized with the second synchronization by the synchronization conversion means, and after the quantized audio data on the recording medium, A means for adding the dummy data during a predetermined period before or after the connection point by detecting the connection of the coded data and a means for selecting the dummy data, There is a recording apparatus characterized by comprising a recording means for recording the additional audio information and the video signal.

According to a fourth aspect of the present invention, there is provided a recording and reproducing apparatus for recording video information and digital audio information on a recording medium and reproducing the video information and digital audio information from the recording medium. Detecting means for detecting a first synchronization corresponding to the encoded data from encoded data generated by compression-encoding the data, and detecting means for detecting a second synchronization of the frame or field from the input video signal; , First
Synchronization conversion means for converting the encoded data from the first synchronization to the second synchronization based on the synchronization relationship between the first synchronization and the second synchronization, and a code adapted to be synchronized with the second synchronization by the synchronization conversion means. Means for recording the encoded data and the video signal on a recording medium, reproducing means for reproducing the encoded data and the video signal from the recording medium, and a phase relationship between the reproduced video signal and the reproduced encoded data. Means for outputting the retained encoded data to an audio output terminal.

According to a fifth aspect of the present invention, there is provided a recording / reproducing apparatus which records video information and digital audio information on a recording medium and reproduces the video information and digital audio information from the recording medium. An audio input terminal to which one of a video input terminal to be input, one of a quantized audio data, and encoded data generated by compressing and encoding the quantized audio data, and the quantized audio data and encoded data Determining means for determining whether the reproduced audio information is quantized audio data or coded data, detecting means for detecting a first synchronization corresponding to the coded data from the coded data, Detecting means for detecting a second synchronization of a frame or a field from an input video signal; A synchronous conversion unit that converts the encoded data from the first synchronization to the second synchronization based on the second synchronization relationship, and quantized audio data and a synchronization conversion unit corresponding to the determination result of the determination unit. Selecting means for selecting one of the coded data synchronized with the second synchronization as audio information, recording means for recording the audio information and the video signal selected by the selecting means, When the reproduced audio information is coded data, the phase relationship between the reproduced video signal and the reproduced coded data is determined by the reproducing means for reproducing the coded data and the video signal and the determining means. Means for outputting the retained encoded data to an audio output terminal.

According to a sixth aspect of the present invention, there is provided a recording / reproducing apparatus which records video information and digital audio information on a recording medium and reproduces the video information and digital audio information from the recording medium. An audio input terminal to which one of a video input terminal to be input, one of a quantized audio data, and encoded data generated by compressing and encoding the quantized audio data, and the quantized audio data and encoded data Determining means for determining whether the reproduced audio information is quantized audio data or coded data, detecting means for detecting a first synchronization corresponding to the coded data from the coded data, Detecting means for detecting a second synchronization of a frame or a field from an input video signal; A synchronous conversion unit that converts the encoded data from the first synchronization to the second synchronization based on the second synchronization relationship, and quantized audio data and a synchronization conversion unit corresponding to the determination result of the determination unit. Selecting means for selecting one of the encoded data synchronized with the second synchronization as audio information, and detecting that the encoded data is connected after the quantized audio data on the recording medium. A predetermined period before or after the connection point, a unit for adding dummy data, a recording unit for recording audio information and a video signal to which the dummy data is added while being selected by the selection unit, When the reproduced audio information is encoded data, the reproduction means reproduces the encoded data and the video signal. A recording location, characterized in that it comprises a means for outputting the reproduced audio output terminal encoded data whose phase relationship has been held between the coded data and.

According to the present invention, the input encoded data is synchronously converted so as to synchronize with the synchronization of the video signal. Therefore, even when the input coded data is not synchronized with the video signal, the video signal and the coded data recorded on the recording medium are synchronized. At the time of reproduction, the output phase shift processing is not performed, and the encoded data and the video signal in which the synchronous relationship is maintained can be output.

Further, it is determined whether the input audio information is quantized audio data or encoded data, and synchronous conversion is performed only when the input audio information is encoded data. Further, when encoded data is connected after the quantized audio data on the recording medium, the dummy data is added so that the dummy data is recorded at the connection point. As a result, it is possible to prevent generation of a large noise even if the determination takes time.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the overall configuration of the first embodiment of the present invention, and FIG. 2 shows signal waveforms at various parts in FIG. In the first embodiment,
This is a VTR that corrects a recording phase shift of input encoded data. To correct the recording phase shift, a frame memory indicated by 11 is used. In the following description, a video frame is described as a break of data processing, but processing may be performed with a field as a break.

In FIG. 1, encoded data D1 is input from an audio input terminal indicated by reference numeral 2. Encoded data D
1 is transmitted in the AES format and supplied to the audio input terminal 1 of the VTR shown in FIG. The input encoded data D1 is written into the frame memory 11. Encoded data D1 written to the frame memory 11
Is data in the AES format or format-decomposed. The encoded data read from the frame memory 11 is supplied to the recording format conversion circuit 55. The video synchronization signal S1 separated by the video synchronization separation circuit 50 is supplied to the frame memory 11 and the encoded data synchronization separation circuit 10.

Although not shown, the encoded data is formed by compressing LPCMs (linearly quantized PCM audio signals) having more than two channels by a compression encoder. For example, it is compressed in the layer II mode of MPEG audio. In the editing system, it is a signal obtained by processing a multi-channel LPCM processed by a mixer by a compression encoder.

As shown in FIG. 2C, the input coded data D1 has a unit of a block of a predetermined length composed of a synchronization header (shaded area in the figure) and a data part (white area in the figure). In one video frame, for example, 3
Blocks are included. In order to form the encoded data, the invention of the previous application is applied. That is, the encoded data is synchronized with the video frame synchronization signal, and the encoded data is packed in the time axis direction so that the video synchronization signal S1
Before and after the period, there is an invalid data period for absorbing the phase fluctuation. However, as described above, the synchronization relationship with the video signal may not be maintained due to the reproduction phase shift function of the reproduction side VTR or through an external device such as a mixer. The frame memory 11 is provided for synchronizing the input encoded data D1 with the video frame because of such a possibility.

The coded data synchronization separation circuit 10 separates the synchronization signal S4 of each block from the synchronization signal S3 located at a timing immediately after the video synchronization signal S1 (see FIG. 2E). The separated synchronization signals S3 and S4 are supplied to the frame memory 11. Writing data to the frame memory 11 is performed by synchronizing the input encoded data D1 with the synchronizing signals S3 and S3.
4, and the reading is performed in synchronization with the video synchronization signal S1. By writing data to the frame memory 11 based on the number of valid data recorded in the synchronization header section of each block, only the valid data is recorded. In this frame memory 11, the input video signal V
1 is converted to synchronous. That is, the encoded data read from the frame memory 11 has a relationship synchronized with the video frame.

The video signal V1 input from the video input terminal 1 is also supplied to the recording format conversion circuit 55. The recording format conversion circuit 55 combines the encoded data / video signals in video frame units based on the video synchronization signal S1 separated in the video synchronization separation circuit 50, and collects them for each video frame as shown in FIG. 2F. The output signal S2 is formed. The output signal S2 of the recording format conversion circuit 55 is recorded at a predetermined position on the magnetic tape via the recording amplifier 56 and the recording head 57.

A track on the magnetic tape is provided with an audio signal recording area separate from a video signal recording area, and encoded data that has passed through the recording format conversion circuit 55 is recorded in this audio signal recording area. .
The video signal may be either an analog or digital signal, but is usually recorded as a digital video signal. Further, the audio PCM signal may be recorded together with the digital video data. In this case, the encoded data is recorded together with the digital video data.

At the time of reproduction, a reproduction output is supplied to a recording format reverse conversion circuit 60 via a reproduction head 58 and a reproduction amplifier 59. Recording format reverse conversion circuit 60
Separates the video signal and the encoded data based on the video synchronization signal S1 separated by the video synchronization separation circuit 50. Since the playback system operates based on the video synchronization signal S1, the playback signal and the video synchronization signal S1
Synchronized. The reproduced video synchronization signal can be obtained from the reproduced signal.

The video signal from the inverse frame conversion circuit 60 is taken out via the video output terminal 4 as a reproduced video signal V2. In addition, the separated encoded data is not subjected to the reproduction process, and is output to the output terminal 3 as reproduced encoded data D2.
Is taken out through. That is, processes such as gain control and reproduction phase adjustment are not performed on the reproduced encoded data. As a result, encoded data is output in which the synchronous relationship with the video frame of the encoded data established by the frame memory 11 at the time of recording is maintained. The encoded data to be output is converted into the AESI / F format.

The video synchronization signal S1 separated by the video synchronization separation circuit 50 is simultaneously output to the servo circuit 51.
Is also supplied. The servo circuit 51 controls the rotation of the rotary drum 52 based on the tape position detected by the control head 53 and the video synchronization signal S1, so that the recording / reproducing track on the tape has a video frame unit break. . As a result, the signals processed collectively for each video frame in the recording format conversion 55 and the recording format reverse conversion circuit 60 are correlated with tracks on the tape and recording / reproduction by the servo circuit 51.

Next, a second embodiment of the present invention will be described. FIG. 3 shows an overall configuration of the second embodiment of the present invention, and FIG. 4 shows an AESI / F format as an example of an I / F format in the second embodiment. In the second embodiment, LPCM and encoded data can be mixedly recorded in an audio signal recording area on a magnetic tape. Audio input terminal 2
Is supplied with LPCM A1 or encoded data D1. Any data is supplied in an AESI / F format. The AESI / F format includes bits that can be used to distinguish between LPCM and encoded data, as described below.

To the audio input terminal 2, an input processing circuit 54, a frame memory 11, an encoded data synchronization separation circuit 10, and a determination circuit 12 are connected. Input processing circuit 5
One of the output signal 4 and the read output of the frame memory 11 is selected by the changeover switch 13. The selected signal is supplied to the recording format conversion circuit 55. The encoded data synchronization separation circuit 10 separates the synchronization signals S3 and S4 from the encoded data. Frame memory 11
In this example, the encoded data is synchronized with the video frame using the video synchronization signal S1 and the synchronization signals S3 and S4.

The determination circuit 12 is constituted by a CPU or the like, and the determination circuit 12 determines whether the data is LPCM or encoded data. The determination process in the determination circuit 12 is performed based on byte0 bit1 of the channel status in the AESI / F format. The value of this bit is 1
Means coded data (non-audio), and 0 of this value means LPCM. In the determination circuit 12, a determination process is performed, and a switching control signal for the switch 13 is formed based on the determination result.

When the input signal is LPCM, the changeover switch 13 selects the output of the input processing circuit 54, and when the input signal is coded data, the changeover switch 13 selects the output of the frame memory 11. And a changeover switch 13 based on a control signal from the determination circuit 12.
Is selected. As in the first embodiment, the output of the recording format conversion circuit 55 is recorded at a predetermined position (audio signal recording area) on the magnetic tape via the recording amplifier 56 and the recording head 57. In this case, the information of byte0 bit1 of the channel status of the AESI / F format described above is also recorded in the recording area of the auxiliary data related to the audio signal, for example, on the magnetic tape.

On the other hand, at the time of reproduction, reproduction data is supplied to the recording format reverse conversion circuit 60 and the determination circuit 12 via the reproduction head 58 and the reproduction amplifier 59. An output signal of the recording format reverse conversion circuit 60 is supplied to the output processing circuit 61 and one input terminal of the changeover switch 14. The output of the output processing circuit 61 is supplied to the other input terminal of the changeover switch 14. The output encoded data or LPCM is converted into the AESI / F format.

In the decision circuit 12, a decision process is performed in the same way as on the recording side using the information of byte0 bit1 included in the reproduced data, and based on the result, the changeover switch 1
4 switching control signals are formed. When the reproduction signal is determined to be coded data, the changeover switch 14 selects the output signal of the recording format reverse conversion circuit 60,
When the reproduction signal is determined to be the LPCM, the control signal is controlled so that the changeover switch 14 selects the output signal of the output processing circuit 61.

FIG. 4 shows the AESI / F format. 4A and 4B show the structure of a subframe including an audio sample word. The length of the subframe is 32 bits. When allocating 24 bits to the audio sample word, the configuration of the subframe of FIG. 4A is adopted, and when allocating 20 bits to it, the configuration of the subframe of FIG. 4B is employed.
In the case of 20 bits, an auxiliary data area (shown by AUX) for 4 bits is provided.

Head of subframe (bit numbers 0 to 3)
Is a preamble followed by an area for a 24-bit audio sample word (FIG. 4A) or an AUX and an area for a 24-bit audio sample word (FIG. 4B). Then, the bit numbers 28 to 31
, A valid bit (V), user data (U), a channel status (C), and a parity bit (P) are sequentially arranged.

The valid bit (V) indicates whether the audio samples in the subframe are suitable for converting to an analog audio signal. User data (U)
Is used to transmit some other data. The channel status (C) includes information associated with each audio channel, and its format is defined by using 192 bits composed of 192 consecutive subframes as blocks. The parity bit (P) detects the presence or absence of an error that occurs at the time of interface.

The preamble indicates a break between a subframe and a block, and has three patterns (X,
Y, Z) are prepared. As shown in FIG. 4C, one continuous frame is composed of two consecutive subframes. The preamble pattern of subframe 1 in one frame is X, and the preamble pattern of subframe 2 is Y. However, channel status 1
The preamble Z is added only to the subframe where the block (192 bits) starts.

Channel status 1 block 19
Two bits (= 24 bytes) are divided into bytes 0 to 23. Various information such as the length of the audio sample word, the sampling frequency, and the number of audio channels is transmitted according to the channel status. Particularly relevant to the present invention is 1-bit information of byte0 bit1 in the channel status block. The 1-bit value 0 means normal audio mode, and the 1 value means non-audio mode. It is defined that 0 of the value of byte0 bit1 means LPCM, and 1 of the value means encoded data.

In the first and second embodiments of the present invention and the third embodiment described below, the encoded data D1 supplied to the audio input terminal 2 is supplied in the AESI / F format described above. It contains information of byte0 bit1.

Next, a third embodiment of the present invention will be described. In FIG. 5 showing the overall configuration of the third embodiment of the present invention, the same reference numerals are given to portions corresponding to those in FIGS. 1 and 3 described above. In the third embodiment, the audio signal recording area on the magnetic tape is
This is applied to a case where a CM and encoded data are mixedly recorded. For example, the third embodiment can be applied to a case where an LPCM is recorded first, and coded data is recorded after an edit point, and editing is performed. In the third embodiment, it is possible to prevent noise from occurring at the joint between the LPCM and the encoded data.

The audio input terminal 2 has LPCM A
1 or encoded data D1 is supplied in AESI / F format (including byte0 bit1 of the channel status). The LPCM A1 is a signal obtained by, for example, reproducing what is recorded as a base on a magnetic tape. That is, first, the VTR performs the reproducing operation, reproduces the LPCM from the magnetic tape, and during the editing period,
An editing operation for recording coded data from the outside is performed. However, as a result of external editing, LP
The third embodiment can be applied to a case where data in which a CM and encoded data are connected is supplied to the audio input terminal 2.

One of the output signal of the input processing circuit 54 and the read output of the frame memory 11 is connected to the switch 1
3 is selected. The selected signal is supplied to the recording format conversion circuit 55. The encoded data is synchronized with the video frame by the frame memory 11. The determination circuit 12 determines whether the data is LPCM or encoded data using the information of byte0 and bit1. Based on the result, a switching control signal for the changeover switch 13 is formed.

On the other hand, at the time of reproduction, reproduction data is supplied to the recording format reverse conversion circuit 60 and the determination circuit 12 via the reproduction head 58 and the reproduction amplifier 59. In the determination circuit 12, byte0 bit1 included in the reproduction data
Is determined in the same manner as on the recording side by using the information of (1), and a switching control signal of the changeover switch 14 is formed based on the result. If the reproduction signal is determined to be coded data, the changeover switch 14 selects the output signal of the recording format reverse conversion circuit 60, and the reproduction signal
When it is determined to be M, the changeover switch 14 selects the output signal of the output processing circuit 61. The configuration for recording / reproducing the audio signal described above is the same as that of the second embodiment.

In the third embodiment, a dummy data generating circuit 15, an editing period determining circuit 16, and a changeover switch 17 are further provided. The output of the changeover switch 13 and the dummy data from the dummy data generation circuit 15 are selected by the changeover switch 17 and supplied to the recording format conversion circuit 17. Dummy data is LPC
When viewed as M, the signal is a silent or minute level signal, and is typically data corresponding to a 0 level. The dummy data is in the form of an AESI / F format. And at least the channel status
The value of byte0 bit1 is set to 1 (meaning encoded data).

The time code input from the time code input terminal indicated by 8 and the control information relating to the editing timing set by operating the external operation panel by an operator (not shown) are supplied to the editing period determining circuit 16. .
The video synchronization signal S shown in FIG. 6B separated by the video synchronization separation circuit 50 is provided to the editing period determination circuit 16.
1 is supplied. The editing period determination circuit 16 is, for example, C
It is configured by a PU or the like, and forms two control signals (dummy flag C1 and edit flag C2) based on a video synchronization signal, control information on edit timing, and a time code.

As shown in FIG. 6E, the dummy flag C1 is a signal which becomes high level (active) after the editing point 31 in, for example, three frame periods. This dummy flag C1 controls the changeover switch 17. Further, the edit flag C2 is supplied to the control terminal of the recording amplifier 56. The changeover switch 17 selects the dummy data from the dummy data generation circuit 15 and supplies it to the recording format conversion circuit 55 while the dummy flag C1 is at the high level. On the other hand, when the dummy flag C1 is at the low level, the output of the changeover switch 13 is selected and supplied to the recording format conversion circuit 55.

That is, when the editing point is set as indicated by 31 in FIG. 6 according to the instruction of the operator, the dummy flag C is set in the three frame periods on the rear side from the editing point 31.
Since 1 becomes high level, dummy data is selected by the changeover switch 17 and recorded in the audio signal area on the magnetic tape. FIG. 6F shows the output signal S2 of the recording format conversion circuit 55 to which the dummy data has been added.

The recording amplifier 56 is supplied with an editing flag C2 which is active during the editing period. Therefore, encoded data including dummy data is recorded on the magnetic tape. The editing period corresponds to a period for recording the encoded data D1. During periods other than the editing period, the VTR is in the reproducing operation state.

The reproduction operation is the same as in the second embodiment described above, and the changeover switch 14 is controlled by the output of the determination circuit 12. The encoded data or LPCM output to the audio output terminal 3 has been converted to the AESI / F format.

A predetermined time is required for the determination processing (normal audio mode / non-audio mode) performed by byte0 bit1 of the channel status of the AESI / F format described above. That is, 192 is used to reconstruct one block of the channel status.
A subframe is required, and the data is stored in C
A period of, for example, one video frame is required for the PU to download, determine, and perform processing.

Therefore, when reproducing a tape in which LPCM and coded data are mixed, the determination at the switching point from LPCM to coded data is delayed, and noise is generated due to erroneous determination of coded data as LPCM. There was a problem to do. As shown in FIG. 7A, when an audio signal in which encoded data is recorded without LPCM after LPCM is reproduced on a magnetic tape, byte0 bit1 (indicated by b in the drawing) after a delay period DL from the edit point ) Has changed from 0 (normal audio mode) to 1 (non-audio mode).
Thereby, the mute is switched from off (reproducible) to on (prohibition of reproduction) in the reproducing system. However, since the encoded data is reproduced during the delay period DL, a large noise is generated and the speaker may be destroyed.

On the other hand, in the third embodiment of the present invention, since the dummy data is recorded, the reproduced audio signal is as shown in FIG. 7C. Delay period DL (for example, 1
Since the period (3 frames) of the dummy data is sufficiently longer than the frame (frame), the dummy data is reproduced in the delay period DL. Since the dummy data is silent or at a very low level, generation of large noise can be prevented.

As shown in FIG. 7E, dummy data may be added before the edit point. Since the value of byte0 bit1 associated with the dummy data is 1, after the delay period DL, the mute is turned on from off and the sound output is prohibited. Then, the encoded data is reproduced, so that generation of large noise can be prevented.

FIG. 7G shows that L is added after the encoded data.
The case where PCM is connected is shown. In this case, the state changes from the mute-on state to the mute-off state after a delay period DL from the edit point, so that there is no need to add dummy data. Of course, dummy data may be added.

In the third embodiment, an example in which dummy data is recorded in three frames after the edit point has been described. However, the third embodiment corresponds to the time required for the determination process performed by the determination circuit 12. Therefore, the dummy data may be recorded over a predetermined period sufficiently longer than the processing time.

The present invention is also applicable to a case where non-linear quantized audio data (for example, polygonal line compression) is used as quantized audio data. Further, the present invention can be applied to a case where an audio data I / F format other than AES is adopted. Further, the present invention can be applied to a case where a recording medium such as a magnetic or optical disk recording medium is used as a recording medium in addition to a magnetic tape.

[0062]

According to the present invention, even when the recording audio phase deviates from the video synchronizing signal by a certain degree or more, it is possible to perform processing so that the preceding and following data do not overlap at the editing point during editing. Further, according to the present invention, when a tape in which the LPCM and the encoded data are mixed in the audio area is created, even if the encoded data is erroneously determined to be the LPCM during reproduction, no large noise is generated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a timing chart used to explain the operation of the first embodiment of the present invention.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a schematic diagram showing an example of an I / F format that can be used in the present invention.

FIG. 5 is a block diagram showing a third embodiment of the present invention.

FIG. 6 is a timing chart used for describing the operation of the third embodiment of the present invention.

FIG. 7 is a schematic diagram used for describing the operation of the third embodiment of the present invention.

FIG. 8 is a block diagram showing an example of a conventional VTR.

FIG. 9 is a timing chart used to describe an operation of an example of a conventional VTR.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Video input terminal, 2 ... Audio input terminal, 10 ... Encoded data synchronous separation circuit, 11 ...
Frame memory, 12,... Determination circuit, 13, 14, 1
7 ... Changeover switch, 15 ... Dummy data generation circuit, 16 ... Edit period determination circuit, 50 ... Video synchronization separation circuit, 54 ... Input processing circuit, 55 ...
Recording format conversion circuit, 56 ... recording amplifier,
60: Recording format reverse conversion circuit, 61: Output processing circuit

Claims (10)

[Claims] 1. A recording apparatus for recording video information and digital audio information on a recording medium, comprising: converting encoded data generated by compression-encoding quantized audio data to the encoded data; Corresponding first
Detecting means for detecting a second synchronization of a frame or a field from an input video signal; and detecting the encoded data based on the first synchronization and the second synchronization relationship. Synchronization conversion means for converting from the first synchronization to the second synchronization; and coded data and a video signal which are synchronized by the synchronization conversion means with the second synchronization are recorded on a recording medium. A recording apparatus, comprising: recording means. 2. A recording apparatus for recording video information and digital audio information on a recording medium, comprising: a video input terminal to which a video signal is supplied; quantized audio data; An audio input terminal to which one of the encoded data generated by encoding is input, a determination unit for determining the quantized audio data and the encoded data, and the encoded data from the encoded data The first corresponding to
Detecting means for detecting a second synchronization of a frame or a field from an input video signal; and detecting the encoded data based on the first synchronization and the second synchronization relationship. Synchronous conversion means for converting from the first synchronization to the second synchronization; and the quantized audio data and the synchronization conversion means for synchronizing with the second synchronization in accordance with a result of the determination by the determination means. A recording apparatus comprising: a selection unit that selects one of the encoded data thus formed as audio information; and a recording unit that records the audio information and the video signal selected by the selection unit. 3. A recording apparatus for recording video information and digital audio information on a recording medium, comprising: a video input terminal to which a video signal is supplied; quantized audio data; An audio input terminal to which one of the encoded data generated by encoding is input, a determination unit for determining the quantized audio data and the encoded data, and the encoded data from the encoded data The first corresponding to
Detecting means for detecting a second synchronization of a frame or a field from an input video signal; and detecting the encoded data based on the first synchronization and the second synchronization relationship. Synchronous conversion means for converting from the first synchronization to the second synchronization; and the quantized audio data and the synchronization conversion means for synchronizing with the second synchronization in accordance with a result of the determination by the determination means. Selecting means for selecting one of the coded data as audio information, and detecting, on a recording medium, that the coded data is connected after the quantized audio data, before or after the connection point. Means for adding dummy data during a predetermined period of time, and audio information and a video signal which are selected by the selection means and to which the dummy data is added are recorded. Recording apparatus characterized by having a recording means. 4. A recording / reproducing / reproducing apparatus which records video information and digital audio information on a recording medium and reproduces the video information and digital audio information from the recording medium. A first corresponding to the encoded data from the encoded data generated by the
Detecting means for detecting a second synchronization of a frame or a field from an input video signal; and detecting the encoded data based on the first synchronization and the second synchronization relationship. Synchronization conversion means for converting from the first synchronization to the second synchronization; and coded data and a video signal which are synchronized by the synchronization conversion means with the second synchronization are recorded on a recording medium. Recording means; reproducing means for reproducing encoded data and a video signal from the recording medium; and outputting encoded data having a phase relationship between the reproduced video signal and the reproduced encoded data to an audio output terminal. Recording and reproducing apparatus comprising: 5. A video input terminal to which a video signal is supplied in a recording / reproducing apparatus which records video information and digital audio information on a recording medium and reproduces the video information and digital audio information from the recording medium. An audio input terminal to which one of the quantized audio data and encoded data generated by compressing and encoding the quantized audio data is input; and discriminating between the quantized audio data and the encoded data. Determining means for determining whether the reproduced audio information is quantized audio data or coded data; and a first corresponding to the coded data from the coded data.
Detecting means for detecting a second synchronization of a frame or a field from an input video signal; and detecting the encoded data based on the first synchronization and the second synchronization relationship. Synchronous conversion means for converting from the first synchronization to the second synchronization; and the quantized audio data and the synchronization conversion means for synchronizing with the second synchronization in accordance with a result of the determination by the determination means. Selecting means for selecting one of the coded data as the audio information, recording means for recording the audio information and the video signal selected by the selecting means, coded data and a video signal from the recording medium. A reproduction means for reproducing the reproduced video signal and a reproduced video signal when the reproduced audio information is encoded data. The recording and reproducing apparatus characterized in that it comprises a means for outputting to the audio output terminal encoded data whose phase relationship has been held between the encoded data. 6. A video input terminal to which a video signal is supplied in a recording / reproducing apparatus which records video information and digital audio information on a recording medium and reproduces the video information and digital audio information from the recording medium. An audio input terminal to which one of the quantized audio data and encoded data generated by compressing and encoding the quantized audio data is input; and discriminating between the quantized audio data and the encoded data. Determining means for determining whether the reproduced audio information is quantized audio data or coded data; and a first corresponding to the coded data from the coded data.
Detecting means for detecting a second synchronization of a frame or a field from an input video signal; and detecting the encoded data based on the first synchronization and the second synchronization relationship. Synchronous conversion means for converting the first synchronization to the second synchronization; and the quantized audio data and the synchronization conversion means for synchronizing with the second synchronization in accordance with a result of the determination by the determination means. Selecting means for selecting one of the coded data as audio information, and detecting, on a recording medium, that the coded data is connected after the quantized audio data, before or after the connection point. Means for adding dummy data during a predetermined period of time, and audio information and a video signal which are selected by the selection means and to which the dummy data is added are recorded. Recording means; reproducing means for reproducing encoded data and a video signal from the recording medium; and discrimination by the discriminating means, if the reproduced audio information is encoded data, the reproduced video signal and the reproduced video signal are reproduced. Means for outputting, to an audio output terminal, encoded data having a phase relationship with the encoded data. 7. The audio input terminal according to claim 1, wherein audio information is supplied to the audio input terminal in a predetermined interface format, wherein the interface format includes quantized audio data and encoded data. Characterized in that it includes information for identifying 8. The audio input terminal according to claim 4, wherein audio information is supplied to the audio input terminal in a predetermined interface format, wherein the interface format includes quantized audio data and encoded data. The control information is recorded on a recording medium, and the audio information reproduced by the reproduced control information is discriminated as quantized audio data or encoded data. Recording and playback device. 9. The apparatus according to claim 3, wherein the dummy data is silent or minute level data. 10. The audio information recording area set on the recording medium according to claim 1, 2, 3, 4, 5, or 6, wherein two-channel quantized audio data can be recorded. Equipment to do.