JPH04265570A - Information signal recording device - Google Patents

Abstract

PURPOSE:To efficiently record the identification code of a sound mode together with a sound signal when the video signal and the sound signal in a certain mode among several sound modes are recorded. CONSTITUTION:There are plural kinds of sound modes used for a High-Vision broadcasting. When the signal of the High-Vision broadcasting is recorded, the sound mode identification signal included in the broadcasting signal is separated and supplied to a system controller, and the system controller generates the 5-bit sound mode identification signal and records it in the sound recording area of a magnetic tape as a control code W2. Since the sound mode identification code (a0 to a3) can identify the recording contents for every two channels of the four channels, a plurality of modes can be identified with a few number of bits.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal recording apparatus, which is a rotary head type VTR, for example, and records video signals and four-channel PCM signals on diagonal tracks.

0002

2. Description of the Related Art In conventional television broadcasting, there are three types of audio modes: monaural, stereo, and multiplexed audio. Because there are few types of audio modes, VTRs require information (usually a digital code) to identify the audio mode.
is not recorded. Therefore, the user manually selects the audio mode according to the tape to be played. For example, in the case of an 8mm VTR, if you record an audio multiplex broadcast signal with main audio and sub audio in two languages, the main audio will be recorded on the standard track along with the video signal, and the PCM track capable of stereo recording will be recorded. , the main audio and the sub audio are recorded respectively. The user selects one audio during playback using the audio monitor switch.

However, the audio mode of high-definition broadcasting, which is one of the high-definition television systems, is
As shown in FIG. 11, 25 types of A mode and 4 types of B mode are planned, which significantly increases the number of audio modes compared to conventional broadcasting. Here, A mode is an audio mode with a sampling frequency of 32kHz and a maximum of 4 channels, and B mode is an audio mode with a sampling frequency of 48kHz.
z is an audio mode with a maximum of 2 channels. Television (TV) is audio related to images of television broadcasting, and additional audio is audio channel 3 (CH3).
) and/or audio unrelated to images of television broadcasts transmitted using channel 4 (CH4). Channel 1 (CH1) ~ Channel 4 (CH4)
), the meaning of each symbol is as follows. L: Front left channel, R: Front right channel, C
: Front center channel, LB: Rear left channel, RB: Rear right channel, S: Surround, Mono:
Monaural, with: Additional audio channel

For example, in the table of FIG. 11, in the first A mode, audio related to television broadcasting is transmitted to channels CH1 and C.
This is a stereo 2-channel mode using H2 and transmits stereo 2-channel additional audio using vacant channels CH3 and CH4, and mono x 2 is used for the audio multiplex mode. In addition, in Figure 11, 3-channel stereo has L, C, and R channels in front of the listener.
This method uses three speakers corresponding to the number of speakers. 3-1
Stereo is a system in which a speaker corresponding to S is additionally arranged in the center of the rear of three-channel stereo. 2-2 stereo has two speakers corresponding to L and R in front of the listener, and LB and R speakers on the left and right behind them.
This is a method in which speakers corresponding to B are additionally arranged.

[0005]

[Problem to be Solved by the Invention] As described above, there are many types of audio modes, so when recording high-definition broadcasting signals on a VTR, if the mode of the recorded audio signal is not known, the audio cannot be played back appropriately. Therefore, it is necessary to record a signal that identifies the audio mode. Furthermore, by editing the audio for every two channels, there are tapes on which audio is recorded in various ways, and it is necessary to be able to accurately identify them. As one of these identification signals, it is conceivable to assign a several-bit code to each channel to identify its content;
This requires an identification code of about 10 bits for each channel, which is not efficient.

[0006] Accordingly, an object of the present invention is to provide an information signal recording device that can identify the audio mode of a recorded signal with a small number of bits when recording an audio signal having multiple audio modes together with a video signal. There is a particular thing.

[0007]

[Means for Solving the Problems] The present invention provides an information signal recording device for recording a four-channel audio signal having a plurality of different modes such as monaural and stereo on a recording medium (85) together with a video signal. This information signal recording device is characterized in that code signals (a0 to a3) for identifying a plurality of modes are recorded for every two channels of audio signals.

[0008]

[Operation] There are many possible audio modes for the four-channel audio signal. An identification code for identifying the audio mode of the recorded signal is recorded on the magnetic tape 85. A large number of audio modes are regarded as modes for every two channels of four channels, and an identification code for distinguishing between the two channel modes is recorded. As a result, the number of bits required for the identification code can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a video signal processing circuit 1 processes a high-definition video signal from an input terminal 2 and converts it into a recording signal. Further, signals reproduced from the magnetic tape are processed by the video signal processing circuit 1 and taken out to the output terminal 3. In the video signal processing circuit 1, the luminance signal Y is time-axis expanded, and two color difference signals PR,
The PB is line-sequentialized and time-base compressed. Then, the luminance signal and the line-sequential color difference signal are time-division multiplexed. These multiplexing processes are performed using digital signal processing. A recording video signal is formed by FM modulating the multiplexed signal converted back into an analog signal. During reproduction, a luminance signal and a color difference signal are formed by signal processing reverse to that during recording.

Two channels of recorded video signals from the video signal processing circuit 1 are supplied to video side terminals V of video/audio switching switches S1 and S2, respectively. Recording amplifier 4 is connected to the output terminal of switch S1.
a, 4b are connected, and recording amplifiers 4c, 4d are connected to the output terminal of the switch S2. The output signal of the recording amplifier 4a is supplied to the rotary head Ha via the recording side terminal r of the recording/reproducing switch. Similarly, the output signals of the recording amplifiers 4b, 4c, 4d are transmitted to the rotary heads Hb, H via the recording side terminal r of the recording/playback switch.
c and Hd, respectively. Rotating head Ha~Hd
Accordingly, the recorded video signal is recorded on the magnetic tape in the video signal area of the diagonal track.

Video signals reproduced from the magnetic tape 1 by the rotary heads Ha to Hd are supplied to reproduction amplifiers 5a to 5d, respectively, via reproduction side terminals p of the recording/reproduction switch. The output signal of the reproduction amplifier 5a and the output signal of the reproduction amplifier 5b are connected to the head switching switch S3.
are supplied to input terminals a and b, respectively. The switch S3 is controlled by a switching pulse whose phase is synchronized with the rotational phase of the rotary heads Ha to Hd, and selects the output signal of the rotary head that is scanning the magnetic tape. Similarly, the output signals of the reproducing amplifier 5c and the reproducing amplifier 5d are alternately selected by the switch S4. Reproduction signals from switches S3 and S4 are supplied to video signal processing circuit 1.

11, 12, 13, 14 are the first to fourth
input terminals 21, 22, 23 to which analog audio signals of the channels (CH1 to CH4) are respectively supplied;
, 24 is an A/D converter that converts the audio signal of each channel into a digital signal, and 6 is a memory that stores the digital audio signal. The memory 6 can store, for example, two fields of digital audio signals. The audio signal read from the memory 6 is supplied to each input terminal 9 of the audio recording processing circuits 7a and 7b. The recording audio signals taken out to the respective output terminals 10 of the audio recording processing circuits 7a and 7b are supplied to the recording amplifiers 4a to 4d through the audio side input terminals S of the switches S1 and S2. And record/
The information is recorded on the magnetic tape by the rotary heads Ha to Hd via the playback switch. The audio recording processing circuits 7a and 7b will be described later.

Audio signals reproduced from the magnetic tape by the rotary heads Ha to Hd are supplied to input terminals 15 of audio reproduction processing circuits 8a and 8b via the recording/reproduction changeover switch and switches S3 and S4, respectively. The audio signal processing circuits 8a and 8b will be described later, but a reproduced audio signal is output to their output terminals 16, and a reproduced address is output to their output terminal 17. The playback audio signal is stored in memory 6 according to the playback address.
will be written to. A control code formed from information from the system controller is supplied to the audio recording processing circuits 7a and 7b, and is recorded on the magnetic tape together with the PCM audio signal. The reproduced audio processing circuits 8a and 8b supply the reproduced control code to the system controller. An error correction circuit 18 for detecting and correcting errors in the reproduced PCM signal in conjunction with the memory 6
is provided. The four-channel PCM signals read from the memory 6 are converted into analog signals by the D/A converters 31-34 and taken out to the output terminals 41-44.

FIG. 2 shows the audio recording processing circuits 7a, 7.
An example of b is shown below. Address and control code W1, W2
A W1-generating circuit 51 and a W2-generating circuit 52 are provided, respectively. Address and control code W
1 and W2 are 8 bits each (here, 8 bits are referred to as 1 word), and the parity generation circuit 53 generates a parity code P for W1 and W2. Control code W2 is formed based on information from the system controller. The PCM audio signal, address and control codes W1, W2, and parity code P from the input terminal 9 are sequentially selected by the selector 54, and the data to be recorded in the audio area of the track is selected by the selector 5.
Output from 4.

The output data of the selector 54 is supplied to a modulation circuit 55 for 8-10 modulation. 8-10 modulation is one type of digital modulation that reduces the direct current component of recorded data by converting 8 data bits per word into 10 channel bits. The output data of the modulation circuit 55 is supplied to a synchronization signal addition circuit 56, and a synchronization signal is added to each block of data. The output data of the synchronization signal addition circuit 56 is supplied to the parallel/serial conversion circuit 57, and serial data is taken out at the output terminal 10.

FIG. 3 shows the audio reproduction processing circuits 8a, 8.
An example of b is shown below. Reproduction data from input terminal 15 is supplied to serial/parallel conversion circuit 62 and PLL 63 via reproduction equalizer 61. A clock synchronized with the reproduced data is formed by the PLL 63. This clock is used to process the reproduced data. The output data of the serial/parallel conversion circuit 62 is supplied to a synchronization detection circuit 64, and a block synchronization signal is detected. A timing signal formed based on the detection of this block synchronization signal is also used to process the reproduced data. The output data of the synchronization detection circuit 64 is 8-1
The signal is supplied to a 0-modulation demodulation circuit 65, and the 10-bit data is converted into 8-bit data.

The output data of the demodulation circuit 65 is sent to the selector 66.
The selector 66 separates the PCM audio signal, address and control codes W1, W2, and parity code P. The PCM audio signal is separated to the output terminal 16, and W1 and W2 are stored in registers 67 and 68, respectively. W1, W from registers 67, 68
2 and the parity P from the selector 66 are supplied to the parity check circuit 69, and the address and control code W1
, W2, an error is detected. Also, the block address W1 from the register 67 is input to the address generation circuit 7.
0, and an address for writing a PCM signal into the memory 6 is formed at the output terminal 17. Furthermore, the control code W2 captured in register 68 is supplied to the system controller and used for control and display.

As shown in FIG. 4, a switching circuit 45 is connected to the output terminals 41 to 44 from which the reproduced audio signals of CH1 to CH4 are taken out. The switching circuit 45 is controlled by a control signal (supplied from an input terminal 46) generated by the system controller. On the output side of the switching circuit 45, speakers 76L, 76C, 76R, 76LB, which correspond to L, C, R, LB, and RB, respectively, are provided via audio amplifiers 71 to 75.
76RB is connected. The speakers 76L and 76R are front left and right speakers, 76C is a front center speaker, and 76LB and 76RB are rear left and right speakers. There is no need to actually connect all these speakers. The switching circuit 45 sends the four-channel audio signals to the speakers 76L, 76C, 76R, 76LB, 76 in response to a control signal generated by the system controller.
Selectively supplies to RB. Therefore, the audio signal can be correctly reproduced without requiring any switch operation by the user.

In FIG. 5, 80 is a system controller composed of a microcomputer. The system controller 80 generates data necessary for generating the control code W2 based on user key operations, programs, etc.
Display and control data is generated from the reproduced control code W2. An audio mode control signal is separated by a separation circuit 82 associated with a MUSE decoder 81 for decoding received high-definition broadcasts and is supplied to a system controller 80 . A display unit 83 associated with the system controller 80 displays a display regarding the audio mode. The display section 83 is, for example, a liquid crystal display section, and is
It is also used for the TR operating mode, clock display, etc. Further, the system controller 80 generates a control signal for the switching circuit 45 described above. When performing after-recording of an audio signal reproduced by another VTR, the system controller 80 receives the audio identification code in the reproduced signal and controls the W2-generating circuit 52.

As shown in FIG. 6A, for example, 3600 rpm
Heads Ha to Hd are attached to a drum 84 that rotates at m. A magnetic tape 85 is wound diagonally around the circumferential surface of the drum 84 and is fed at a constant speed. Heads Ha and Hc are provided in close positions, head Hb is arranged at an angular interval of 180° from head Ha,
A head Hd is arranged at an angular interval of 180° from the head Hc. As shown in FIG. 6B, the heads Ha and Hc have a double azimuth head configuration having two gaps whose extension directions are different from each other.

Heads Hb and Hd also have a similar configuration. Since one frame of the high-definition system is 1/30 seconds, the drum 84 rotates twice in the period of one frame, and the pairs of heads (Ha and Hc pair, Hb and Hd pair)
scans the magnetic tape 85 a total of four times. As a result, four segments (eight tracks) are formed on the magnetic tape 85. Video signal processing is performed in units of one frame period. FIG. 7 shows an example of a track pattern formed on the magnetic tape 85. In FIG. 7, T1 to T8 indicate tracks, T1 and T2, T5 and T6 are tracks formed simultaneously by rotary heads Hb and Hd, and T3 and T4, T7 and T8 are tracks formed simultaneously by rotary heads Ha and Hc. This is the track that will be used.

Each track T1 to T8 is a magnetic tape 85.
A predetermined range from the beginning of the track is an audio track 86S, and the area from there to the end is a video track 86V. The audio track 86S is each divided into two areas. The audio track 86S of track T3 formed by rotary head Ha is equally divided into areas A1 and A2, and the audio track 86S of track T4 formed by rotary head Hc is divided equally into areas A3 and A2.
Divided equally into 4. Similarly, the audio track 86S of track T5 is divided into areas A5 and A6, and the audio track 86S of track T6 is divided into areas A7 and A8.
divided into

[0023] In these four-track areas A1 to A8, one field of four-channel PCM audio signals, addresses, and control codes are recorded. The unit of processing for audio signals is one field period. More specifically, in areas A1, A3, A5, and A7,
CH3 and CH4 PCM audio signals, addresses and control codes are recorded, and areas A2, A4, A6
, A8, the PCM audio signals of CH1 and CH2, addresses and control codes are recorded.

FIG. 8A shows one track, for example T3, consisting of an audio track 86S including areas A1 and A2 and a video signal track 86V. CH1 and CH2
The area A2 in which the PCM audio signal is recorded consists of 40 blocks, as shown in FIG. 8B, and one block has the configuration shown in FIG. 8C. That is, a block synchronization signal of one word is located at the beginning of one block, and then a block synchronization signal of one word is located at the beginning of one block.
The word block address W1 is located, then 1
A word of control code W2 is located, followed by a word of parity P for W1 and W2. Then, the data of D1 to D31, each of which is one word (PC
M audio signal or parity of error correction code) is located there.

Referring to FIG. 9, allocation of information on addresses and control codes W1 and W2 will be explained. The block address W1 is related to 1 field (4 tracks x 40 blocks = 160 blocks) and is (0 to 15
9). The contents of the control code W2 are defined corresponding to each of the lower three bits (000) to (111) of the block address W1. Those not defined are reserved. Control code W2
ID0 to ID2 (5 bits) are CH1 and CH2
This is an identification code that includes information for distinguishing the CH3 and CH4 areas from the CH3 and CH4 areas, copy prohibition information, emphasis on/off information, and the like. The frame address FRADR is address information that changes from 0 to 7 for each field of the video signal. The lower 3 bits of the block address are inserted into the (010) block5
Bits (a0, a1, a2, a3, a4) are used to identify the audio mode. Audio mode identification code a0-a4
identifies the two-channel audio mode recorded in the same area. For example, in the example of FIG. 8, in area A2,
Since CH1 and CH2 are recorded, this area A2
The voice identification codes a0 to a4 in the control code W2 are C
This relates to two channels, H1 and CH2.

The above-mentioned 5 bits a0 to a4, which are a feature of the present invention, will be explained with reference to FIG. As shown in FIG. 11, this embodiment can record received signals of high-definition broadcasting, which have 29 types of audio modes, 25 types of A mode and 4 types of B mode, in total. In FIG. 11, when focusing on two channels (CH1, CH2) and two channels (CH3, CH4), their contents are limited to the following eight types. ■ (L, R) ■ (Mono x 2) ■ (Mono + Silence) ■ (Silent x 2) ■ C + S) ■ (C + Mono) ■ (C + Silence) ■ (L
B+RB)

Among these, in (1), (2), and (2) to (2), the contents of the odd channels (CH1 and CH3) and the even channels (CH2 and CH4) are not interchanged. For example, in ■, the content of CH1 is R and the content of CH2 is never L. Further, when editing is performed, editing is usually performed in units of two channels rather than editing in units of one channel. Therefore, it is more efficient to allocate the identification code for identifying the 29 audio modes shown in FIG. 11 to every two channels than to allocate it to each channel because the required number of bits is smaller. That is, in this embodiment, the 4 bits a0 to a3 of the audio identification code are defined so as to identify the recorded contents from ■ to ■, as shown in FIG. Eight types of recorded contents can be identified using three bits, but seven bit patterns are prepared as backup. Also, (a0, a1, a2, a3)
When is (0111), it means that the mode of the recorded content cannot be determined (unknown) because the identification signal indicating the audio mode in the received high-definition signal is not correctly transmitted to the system controller 80.

Another bit a4 among the 5 bits for audio mode identification is (a) when the recorded content is television audio.
4="1"), and (a4="0") when the recorded content is additional independent audio unrelated to the image. If only audio is after-recorded, there is a possibility that audio unrelated to images will be recorded. In each mode shown in FIG. 11, those used as additional independent voices are as described above.
It is. However, 3-1 stereo, 2-2 stereo, 3
Considering channel stereo after-recording, ■~■ may also be used as additional independent audio. Therefore, as described above, 1 bit a4 is assigned to the identification code for television audio and additional independent audio, in addition to the code (a0 to a3) for identifying the recorded content itself. This reduction in efficiency does not pose a problem; rather, the advantage is that the system control of the VTR becomes easier.

As described above, during recording, the control code W2 is generated in the W2-generating circuit 52 of the audio recording processing circuit (FIG. 2) based on information from the system controller 80 (FIG. 5). During playback, the control code W2 separated by the selector 66 of the audio playback processing circuit (FIG. 3) is supplied to the system controller 80, and the control code W2 is supplied to the system controller 80, which is then sent to the switching circuit (FIG. 4) for switching the audio system.
) control and display of audio mode are controlled by system controller 8.
done under the control of 0.

The present invention is not limited to the above-described embodiment as a method for recording four-channel audio signals on tape. For example, an area for recording audio signals may be formed in the center of the track, or each channel may be recorded in a dedicated recording area.

[0031]

Effects of the Invention According to the present invention, when recording a signal having multiple audio modes, such as high-definition broadcasting, a code is recorded to identify the audio mode of the recorded signal. can be used to control the audio playback mode, eliminating the need for the user to perform complex switch operations. Furthermore, since the present invention identifies the audio mode for every two channels of the four-channel audio signal,
Unlike identifying audio modes for each audio mode or for each channel, this method requires fewer bits and is more efficient.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram of an example of an audio recording processing circuit.

FIG. 3 is a block diagram of an example of an audio playback processing circuit.

FIG. 4 is a block diagram showing an example configuration when outputting a reproduced audio signal.

FIG. 5 is a block diagram showing the peripheral configuration of the system controller.

FIG. 6 is a schematic diagram showing the arrangement of the rotary head and the configuration of the rotary head.

FIG. 7 is a schematic diagram showing an example of a track pattern.

FIG. 8 is a schematic diagram used to explain the data structure of one track.

FIG. 9 is a schematic diagram showing allocation of block addresses and control codes.

FIG. 10 is a schematic diagram used to explain a code for voice identification.

FIG. 11 is a schematic diagram showing types of audio modes of high-definition broadcasting.

[Explanation of symbols]

Ha, Hb, Hc, Hd Rotating head 1 Video signal processing circuit 6 PCM audio memory 7a, 7b
Audio recording processing circuit 8a, 8b Audio reproduction processing circuit 51 W1-generation circuit 52 W2-generation circuit 80 System controller 85 Magnetic tape

Claims (1)

[Claims] Claim 1. An information signal recording device for recording four-channel audio signals having a plurality of different modes such as monaural and stereo on a recording medium together with a video signal, wherein the An information signal recording device characterized by recording a code signal for identifying a plurality of modes.