JPH04243385A - Identification signal recording and reproducing device for vtr - Google Patents

Abstract

PURPOSE:To realize the identification recording and reproducing device able to record an identification and reproducing a video tape on which the identification signal is recorded with a conventional VTR. CONSTITUTION:The device records and reproduces a signal identifying whether or not an audio signal is a dual audio signal and a trouble for the user to discriminate whether or not an audio signal is a dual audio signal at reproduction and to select the audio monitor mode is avoided. Moreover, when a video tape on which an identification signal is recorded is reproduced by a conventional VTR, since the identification signal is eliminated by a comb-line filter, no hindrance is caused.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an identification signal recording and reproducing apparatus for use in a VTR.

0002

[Prior Art] In recent years, in television broadcasting, audio multiplex broadcasting that broadcasts dual audio or stereo audio in two languages, etc. has been increasing.
Also, devices that can receive, record and reproduce audio multiplexed signals are becoming popular.

[0003] Hereinafter, with reference to the drawings, the conventional VTR
explain about. FIG. 6 is a block diagram of an example of a conventional VTR. In FIG. 6, 3 is a color signal recording processing circuit;
is a color signal reproduction processing circuit, 6 is a comb filter, 7 is a video tape, 8, 9, 11, 12, 22 are input terminals, 23
, 24, 25, and 26 are output terminals, 13 is a luminance signal recording processing circuit, 14 is a first audio signal recording processing circuit, 15 is a second audio signal recording processing circuit, 16 is a luminance signal reproduction processing circuit, and 17 is a luminance signal recording processing circuit. A first audio signal reproduction processing circuit, 18 a second audio signal reproduction processing circuit, 19 and 20 switches, and 30 a control signal generation circuit.

Regarding the VTR with the above-mentioned components,
The operation will be explained below. In FIG. 6, during recording, a luminance signal is input from the input terminal 8, and the luminance signal recording processing circuit 1
3 and recorded on videotape 7. A carrier color signal is inputted from the input terminal 9, converted into a low frequency converted color signal by the color signal recording processing circuit 3, and recorded on the videotape 7. A first audio signal m is output from the input terminals 11 and 12.
The first and second audio signals m2 are inputted, subjected to FM modulation by the first audio signal recording processing circuit 14 and the second audio signal recording processing circuit 15, respectively, and recorded on the video tape 7.

[0005]

[Table 1]

[0006] As shown in Table 1, in the case of dual audio broadcasting such as in two languages, the first audio signal m1 is the main audio signal and the second audio signal m2 is the sub audio signal. be. In the case of stereo broadcasting, the first audio signal m1 is a left audio signal, and the second audio signal m2 is a right audio signal. Furthermore, in the case of monaural broadcasting, both the first audio signal m1 and the second audio signal m2 are the same monaural audio signal.

At the time of reproduction, the luminance signal r and the carrier color signal i are reproduced by the luminance signal reproduction processing circuit 16 and the color signal reproduction processing circuit 4, and the luminance signal r and the carrier color signal i are outputted to the output terminal 23 and the comb filter 6, respectively.
supplied to The carrier color signal i supplied to the comb filter 6 is outputted from the output terminal 24 after removing crosstalk components from adjacent tracks. On the other hand, the first audio signal reproduction processing circuit 17 and the second audio signal reproduction processing circuit 18 reproduce the first audio signal n1 and the second audio signal n2, respectively, and supply them to the switch 19 and the switch 20. .

The control signal generating circuit 30 switches the switch 1 in accordance with a signal o input from the input terminal 22 indicating whether the audio monitoring mode is the first, second, or third mode.
Control signals p1 and p2 for controlling the switch 9 and the switch 20 are output. The switches 19 and 20 select either the first audio signal n1 or the second audio signal n2 and output it to the output terminals 25 and 26 according to the control signals p1 and p2. (Table 2
) shows how it works. In the first mode, the switch 19 selects the first audio signal n1, and the switch 20 selects the second audio signal n2. In the second mode, both switches 19 and 20 select n1. Further, in the third mode, both switches 19 and 20 select n2.

[0009]

[Table 2]

0010

[Problems to be Solved by the Invention] However, as shown in Table 2, in the VTR configured as described above, in the first mode, when playing double audio such as bilingual,
Main audio and sub audio are output at the same time, making it difficult to hear. Also, in the second and third modes, when playing stereo audio,
Only one of the left audio and right audio is output. Since no information is recorded to identify whether the audio signal is double audio or not, the user must judge for themselves whether the audio signal is double audio or stereo audio during playback. In the case of stereo audio, the user must select the second or third mode, and in the case of stereo audio, the first mode must be selected, which poses a problem in that switching the audio monitor mode is cumbersome.

SUMMARY OF THE INVENTION An object of the present invention is to provide a VTR identification signal recording and reproducing apparatus that solves the above problems.

0012

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a color under system VTR for recording and reproducing PAL television signals, in which the phase is inverted by 180 degrees every two horizontal scans at the color subcarrier frequency. a first means for generating a pilot signal for a first identification signal; and for a first predetermined period during a horizontal blanking period when a first identification signal is input, the pilot signal generated by the first means is input for carrying. a second means for outputting the input carrier color signal by inserting it into the color signal and outputting the input carrier color signal as it is when the first identification signal is not input; a third means for converting the converted color signal and recording it on a recording medium; a fourth means for reproducing the low frequency converted color signal recorded by the third means on the recording medium, converting the frequency into a carrier color signal and outputting it; and a horizontal block. a fifth means for detecting whether a pilot signal is inserted into the output of the fourth means for a second predetermined period during the ranking period and outputting a second identification signal; and an output of the fourth means. a sixth means for outputting a difference between the signal and a signal obtained by delaying the output of the fourth means by two horizontal scanning periods;
It is equipped with the means of

[0013]

[Operation] With the above configuration, the present invention is capable of recording and reproducing a signal for identifying whether or not an audio signal is a double audio signal. This eliminates the trouble of having to switch the audio monitor mode based on the judgment.

Further, even when a videotape on which an identification signal is recorded according to the present invention is played back on a conventional VTR, no problem occurs because the identification signal is removed by a comb filter.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the VTR identification signal recording and reproducing apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. In FIG. 1, 1 is a first means, 2 is a second means,
3 is a color signal recording processing circuit, 4 is a color signal reproduction processing circuit, 5 is a color signal recording processing circuit;
is the fifth means, 6 is a comb filter, 7 is a video tape, 8, 9, 10, 11, 12, 22 are input terminals, 23,
24, 25, 26 are output terminals, 13 is a luminance signal recording processing circuit, 14 is a first audio signal recording processing circuit, and 15 is a second
16 is a luminance signal reproduction processing circuit, 17 is a first audio signal reproduction processing circuit, 18 is a second audio signal reproduction processing circuit, 19 and 20 are switches, and 21 is a control signal generation circuit. be. 2a, b, c, and d respectively represent the first means 1, the second means 2, and the fifth means 5 in FIG.
This shows the configuration of a comb filter 6. Also, Figure 3
, FIG. 4 and (Table 3) are diagrams and tables for explaining the operation of FIG.

The relationship and operation of each component of the VTR identification signal recording and reproducing apparatus having the above-mentioned components will be explained below.

In FIG. 1, during recording, a luminance signal is inputted from the input terminal 8, subjected to FM modulation by the luminance signal recording processing circuit 13, and recorded on the video tape 7. The carrier color signal b is inputted from the input terminal 9, passes through the second means 2, is converted into a low frequency converted color signal by the color signal recording processing circuit 3, and is recorded on the videotape 7. A first audio signal m1 and a second audio signal m2 are inputted from input terminals 11 and 12, and are FM-modulated by a first audio signal recording processing circuit 14 and a second audio signal recording processing circuit 15, respectively, and then converted into a video signal. recorded on tape 7.

Here, the first means 1 creates a pilot signal u whose phase is inverted by 180 degrees every two horizontal scans at the color subcarrier frequency and supplies it to the second means. 2(a). A horizontal synchronizing signal c is input from the input terminal 108, and the gate pulse generating circuit 101
A burst gate pulse is created with burst gate 1
02. A burst signal is extracted from the carrier color signal b input from the input terminal 9 at the burst gate 102 and supplied to the phase comparator 104 . Voltage controlled crystal oscillator (hereinafter referred to as VCXO). 105 is a phase comparator 104 which outputs a carrier signal w1 having a color subcarrier frequency fSC;
It is supplied to an inverter 106 and a switch 107. The phase comparator 104 compares the phase of the burst signal supplied from the burst gate 102 and the output w1 of the VCXO 105, and calculates V
Controls CXO105. As a result, VCXO105
oscillates in synchronization with the burst signal of the carrier color signal b. The 4-frequency divider circuit 103 divides the frequency of the horizontal synchronizing signal c by 4 to create a signal d that is inverted every two horizontal scans, and supplies the signal d to the switch 107 . The inverter 106 changes the output w1 of the VCXO 105 to 1
The signal w2 whose phase is inverted by 80 degrees is supplied to the switch 107. The switch 107 alternately selects and outputs the output w1 of the VCXO 105 and the output w2 of the inverter 106 every two horizontal scans according to the output d of the frequency divider 103. Thus, every 2 horizontal scans 180
A pilot signal u having a phase inversion is created.

An example of the configuration of the second means 2 is shown in FIG. 2(b). The pilot signal u created by the first means is input from the input terminal 205. A horizontal synchronizing signal c is input from the input terminal 206, and the gate pulse generating circuit 201
A pulse v is output for a predetermined period during the horizontal blanking period. An identification signal a indicating whether the audio signal is double audio is input from the input terminal 10 . AND circuit 20
2 is the output v of the gate pulse generation circuit 201 and the identification signal a
The logical product e is created and the switch 203 is controlled. When the identification signal a is input (in the case of double audio), the switch 203 inputs the pilot signal u generated by the first means for a predetermined period during the horizontal blanking period, as shown in FIG. 3(a). is inserted into the carrier color signal b and output. On the other hand, if the identification signal a is not input (not a double voice), the switch 203 outputs the carrier color signal b as is, as shown in FIG. 3(b).

At the time of reproduction, the luminance signal r and the carrier color signal i are reproduced by the luminance signal reproduction processing circuit 16 and the color signal reproduction processing circuit 4, and are outputted to the output terminal 23 and the comb filter 6, respectively.
supplied to The carrier color signal i supplied to the comb filter 6 is outputted from the output terminal 24 after removing crosstalk components from adjacent tracks. On the other hand, the first audio signal reproduction processing circuit 17 and the second audio signal reproduction processing circuit 18 reproduce the first audio signal n1 and the second audio signal n2, respectively, and supply them to the switch 19 and the switch 20. .

The fifth means 5 detects whether or not a pilot signal is inserted into the output i of the color signal reproduction processing circuit 4 during a predetermined period during the horizontal blanking period.
An example of the configuration is shown in FIG. 2(c). 501 is a gate pulse generation circuit, 502 is a gate circuit, 503 is a level detection circuit, 504 and 505 are input terminals, and 506 is an output terminal. When a pilot signal is inserted, that is, in the case of a double audio signal, the identification signal k becomes High as shown in FIG. 4(a). On the other hand, when no pilot signal is inserted, that is, when there is no double voice, the identification signal k becomes Low as shown in FIG. 4(b).

The control signal generating circuit 21 is supplied from the fifth means 5 with a signal o input from the input terminal 22 and indicating whether the audio monitor mode is the first, second, or third mode. According to the identification signal k, control signals p1 and p2 for controlling the switch 19 and the switch 20 are output. The switches 19 and 20 select either the first audio signal n1 or the second audio signal n2 and output it to the output terminals 25 and 26 according to the control signals p1 and p2. (Table 3) shows how it works.

[0024]

[Table 3]

In the case of dual audio and the first mode, both switches 19 and 20 select the first audio signal n1. For dual audio and second mode, switch 19,2
0 both select the second audio signal n2. In other cases, the switch 19 selects the first audio signal n1, and the switch 20 selects the second audio signal n2. That is, if the first mode is set, only the main audio is output in the case of double audio, and the left audio and right audio are output in the case of stereo audio. Furthermore, if the second mode is set, only the sub-audio is output in the case of double audio, and the left audio and right audio are output in the case of stereo audio. Furthermore, if the third mode is set, the main audio and sub audio are output in the case of double audio, and the left audio and right audio are output in the case of stereo audio. Therefore, if a person who listens to the main audio in a bilingual broadcast such as a movie is set to the first mode, and a person who listens to the sub-sound is set to the second mode, there will be no inconvenience in normal use. Furthermore, when it is desired to output the main audio and the sub audio at the same time, such as during dubbing, the third mode may be set.

On the other hand, the comb filter 6 has a 2H delay circuit (1H=1/fH) 6 as shown in FIG. 2(d).
01 and a subtraction circuit 602.
Subtract the signal s delayed by H. Here, since the color subcarrier frequency fSC is fSC=(283+3/4)·fH, the pilot signal whose phase is inverted by 180 degrees every two horizontal scans at the frequency fSC is processed by the comb filter 6 as shown in FIG. will be removed. Note that this comb filter is the same in the conventional example shown in FIG.

As described above, according to this embodiment, it is possible to record and reproduce a signal for identifying whether or not an audio signal is a double audio signal, and it is possible to determine whether or not the audio signal is a double audio signal during playback. This eliminates the inconvenience of having to switch the audio monitor mode each time the user makes their own decisions.

Further, even when a videotape on which an identification signal is recorded in this embodiment is played back on a conventional VTR, no problem occurs because the identification signal is removed by the comb filter.

[0029]

[Effects of the Invention] As is clear from the above embodiments, according to the present invention, identification signals can be recorded and reproduced, and
In this embodiment, the videotape on which the identification signal is recorded is
It is possible to provide an excellent VTR identification signal recording and reproducing device that does not cause any trouble even when reproduced with a TR.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a VTR identification signal recording and reproducing device according to an embodiment of the present invention.

[Figure 2] Block diagram showing the configuration of each part in Figure 1

[Figure 3] Diagram explaining the operation in Figure 1

[Figure 4] Diagram explaining the operation in Figure 1

[Figure 5] Diagram explaining the operation in Figure 1

[Figure 6] Block diagram of a conventional VTR

[Explanation of symbols]

1 First means 2 Second method 3 Color signal recording processing circuit 4 Color signal reproduction processing circuit 5. Fifth means 6 Comb filter

Claims (1)

[Claims] 1. A color under system VTR for recording and reproducing a PAL system television signal, comprising: a first means for creating a pilot signal whose phase is inverted by 180 degrees every two horizontal scans at a color subcarrier frequency; When an identification signal is input, the pilot signal created by the first means is inserted into the input carrier color signal for a first predetermined period during the horizontal blanking period and outputted, and the first identification signal is outputted. a second means for outputting the input conveyance color signal as it is when the input color signal is not input; a third means for converting the frequency of the output of the second means into a low-pass conversion color signal and recording it on a recording medium; a fourth means for reproducing the low frequency converted color signal recorded by the means of 3 on a recording medium, converting the frequency into a carrier color signal and outputting the same; fifth means for detecting whether a pilot signal is inserted into the output and outputting a second identification signal; and delaying the output signal of the fourth means and the output of the fourth means by two horizontal scanning periods. an identification signal recording and reproducing apparatus for a VTR, comprising: sixth means for outputting a difference between the signal and the input signal.