JPS60224140A - Video tape recorder - Google Patents

Abstract

PURPOSE:To record a program searching signal even in an audio tape recorder mode by providing a program searching signal generating circuit which produces a program searching signal at a recording mode setting start time point in the audio tape recorder mode and a releasing time point in a record temporary stop mode. CONSTITUTION:In a video tape recorder VTR mode a changeover switch S3 is kept on and a video signal recording circuit 1 is actuated together with a sound signal recording circuit 2. A program searching signal generating circuit 12 produces a program searching signal (f) in response to supply a recording mode signal (b) and a mute signal (d) from input terminals 8 and 10 respectively. In an audio tape recorder ATR mode an ATR mode signal (a) is supplied from an input terminal 7 to turn off the S3. Then the circuit 12 produces a signal (f) like the VTR mode. A pause mode signal (c) is supplied from an input terminal 9, and the supply of the signal (d) is discontinued when the supply of the signal (c) is stopped. Then the signal (f) is produced. Thus the signal (f) can be recorded even in an ATR mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a video tape recorder that can be set to an operation mode in which only audio signals are recorded. This invention relates to a video tape recorder capable of recording.

[Background of the invention]

Conventionally, in video tape recorders, a rotating head records video signals and a fixed head records audio signals. The audio signal is recorded simultaneously. Additionally, a video tape recorder uses the same rotating head and uses the skin effect of the magnetic tape to record audio signals in the deep layer of the magnetic layer of the magnetic tape and video signals on the surface of this magnetic layer. has also been developed.

In addition, in such a video tape recorder, the video
It has become popular to have a configuration that allows setting of an operating mode in which only audio signals are recorded without recording signals, and it has become possible to use video tape recorders as audio tape recorders. . The operating mode of the video tape recorder is AT R (Aud
io Tape Recorder) However, by using this ATR mode, you can obtain very high-quality live audio.

By the way, in the conventional video tape recorder described above, a cue signal is recorded for each recorded program, so that a search for a program that requires women can be easily performed. This cue signal is recorded as a pulse on a track formed in the longitudinal direction of the magnetic tape by a fixed head (cue cue recording/playback head), but in conventional video tape recorders, the video signal and the audio signal are (hereinafter, such operation mode is referred to as VTR mode), only when simultaneously recording (hereinafter, such operation mode is referred to as VTR mode), the recording mode start point of the VTR mode, that is,
In order to record a video signal and an audio signal, the cue signal is recorded only when a record button and a playback button are operated at the same time.

However, in the ATR mode, it is not possible to record a cue signal, and for example, when recording music, it is necessary to separate each song by providing a non-recording section between each recorded song. However, there was a problem in that it took a lot of effort to search for a desired song. Also, since the cue signal is recorded only when the recording mode is set, in order to record the cue signal for each desired broadcast program, set the cue signal to stop mode each time and switch to record mode. and
Then, upon receiving the desired broadcast program, it is necessary to set it to recording mode. In this case, when switching from recording mode to stop mode, the magnetic tape is always unloaded, and when switching from stop mode to recording mode, the magnetic tape is always loaded, so when you press the record button, There is a certain amount of time between when the playback button is operated and when recording actually starts, and this can lead to situations where the beginning of the signal of the desired broadcast program is not recorded. The cue signal at this time represents the recording start portion of the actually recorded signal.

Although this is not a particular problem when recording video signals, it becomes a problem when recording music or the like.

In this way, in order to prevent missing signals to be recorded, before recording the desired broadcast program, switch from stop mode to record mode, record the cue signal, and then immediately pause recording. mode (hereinafter referred to as pose mode)
It is a good idea to set the pause mode to 1, wait, and cancel the pause mode as soon as the desired broadcast program is received. By such operation,
The desired broadcast program is recorded from the beginning, and the cue signal also indicates the recording start position of the program.

However, this method has a problem in that the operation is complicated.

[Purpose of the invention]

The purpose of the present invention is to solve the problems of the above-mentioned prior art, and to
To provide a video tape recorder which is capable of recording a cue signal even in R mode and which simplifies the operation for recording the cue signal.

[Summary of the invention]

To achieve this objective, the present invention generates and records an application signal at the start of the recording mode and at the beginning of the recording pause mode when the ATR mode is set, and when the recording pause mode is set. , even by the release operation,
The feature is that the cue signal is recorded.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a video tape recorder according to the present invention, in which 1 is a signal recording circuit;
1 is an audio signal recording circuit, 3 is an open/close switch, 4 is a rotating head, and 5 and 6 are fixed heads.

7 to 11 are input terminals, and 12 is a cue signal generation circuit.

In the figure, mode signals are supplied to input terminals 7, 8, and 9. The mode signal supplied to input terminal 7 is AT
R mode signal signal image becomes high level (hereinafter referred to as 'H') when ATR mode is set. Input terminal 8
The mode signal supplied to the input terminal 9 is a recording mode signal that becomes 'H' depending on the setting of the recording mode.The mode signal supplied to the input terminal 9 becomes 'H' depending on the setting of the Bose mode.
” is the Bose mode signal C.

Furthermore, a mute signal d is supplied from the input terminal 10. This mute signal d is supplied for a short time and during the Bose mode setting period at the same time as the recording mode is set. An input terminal 11 supplies a head switching signal e for switching between two rotary heads (only one rotary head 4 is shown in FIG. 1) during reproduction. This head switching signal e is 30Hz in the case of the NTSC system, and 30Hz in the case of the PAL system.
It is 25Hz.

Next, the operation of this embodiment will be explained.

Now, in the VT mode, the ATR mode signal image level (hereinafter referred to as L'') supplied to the input terminal 7
Yes, the changeover switch 3 is in the on state.

In this state, if you simultaneously operate the record button and playback button (not shown) to set the recording mode, the mute signal d will remain unchanged until the magnetic tape (not shown) is loaded and the tape is in a stable running state. The video signal recording circuit 1 and the audio signal recording circuit 2 are controlled so as not to output the video signal and the audio signal, respectively. At the same time,
The cue signal generating circuit 12 is supplied with a recording mode signal ``H'' from the input terminal 8, and is also supplied with a mute signal d of ``H'' from the input terminal 10. Note that when the power shown in the figure is turned on and the rotary head 4 rotates, a head switching signal e is supplied from the input terminal 11.

When the running of the magnetic tape becomes stable, the mute signal d is no longer supplied), the video signal recording circuit 1 outputs the video signal, and the audio signal recording circuit 2 outputs the audio signal. The video signal is supplied to the rotary head 4 via the changeover switch 3,
The audio signals are supplied to a fixed head (that is, an audio signal recording/reproducing head) 5 and are respectively recorded.

On the other hand, the cueing signal generation circuit 12 generates a pulsed cueing signal f synchronized with one pulse of the head switching signal e after the fall of the mute signal d, and this cueing signal f is used for a fixed head (i.e. , a cue signal is supplied to the recording/reproducing head) 6 and recorded.

In this way, a cue signal representing the recording start position on the magnetic tape is recorded.

Next, when the Bose button (not shown) is operated to set the Bose mode, the Bose mode signal C is supplied from the input terminal 9 to the cue generator 12, and the magnetic tape is stopped. At the same time, the video signal recording circuit 1 and the audio signal recording circuit 2 stop outputting the video signal and the audio signal, respectively, depending on the mute signal, and recording is temporarily stopped. Further, the cue signal generation circuit 12 is supplied with a mute signal d from the input terminal 10 .

When the Bose mode is canceled, recording starts and the mute signal d is no longer supplied to the cue signal generation circuit 12, but at this time, even if the mute signal d is no longer supplied from the cue signal generation circuit 12, The cue signal f is not generated.

Therefore, the cue signal is not recorded when the Bose mode is canceled. This is because when recording a video signal, for example, a broadcast program may be recorded excluding the commercial portion, and in such a case, the video tape recorder is set to Bose mode for the commercial image portion. This is because it is undesirable for a cue signal to be recorded every time the Bose mode is set. The reason why the Bose mode signal C is supplied from the input terminal 9 to the cue signal generation circuit 12 is to prevent the cue signal generation circuit 12 from generating a cue signal after the Bose mode is released.

The above operations in the VTR mode are performed in the same way in conventional video tape recorders.

Next, the operation in ATkL mode will be explained.

When the ATfL mode is set and the ATR mode signal a supplied from the input terminal 7 becomes 'H', the selector switch 3
becomes the off state.

Therefore, when the recording mode is set, the cue signal generation circuit 1 is output from the input terminal 8 as in the VTH mode.
A recording mode signal d is supplied to the audio signal recording circuit 2 and the cueing signal generating circuit 12 until the running of the magnetic tape becomes stable. Mo,
When the mute signal d is no longer supplied, the rotary head 5 records the audio signal, and the fixed head records a cue signal indicating the recording start position of the audio signal.

When switching from recording mode to Bose mode, input terminal 9
A Bose mode signal C of H' is supplied from the input terminal 10, and at the same time, a mute signal d is supplied from the input terminal 10. At this time as well, the recording mode signal of "H" is being supplied from the input terminal 8, and it goes without saying that recording has stopped (So, when the Bose mode is canceled, the mute signal is d is no longer supplied υ, and recording of the audio signal starts, but at the same time, the cue signal generation circuit 12 generates a cue signal synchronized with one pulse of the head switching signal e after the fall of the mute signal d. generate f.

Therefore, a cue signal representing the sound piece signal recording start position after Bose mode is canceled is recorded.

In the VTR mode, when the Bose mode is canceled, the generation of the cue signal f in the cue signal generation circuit 12 is prohibited by the pause mode signal C, but in the ATR mode, ATR-e-code signal a is 'H'
”, the pause mode signal C is disabled, and therefore, even when Bose mode is released,
The cue signal f is generated after the mute signal d falls.

As mentioned above, in this example, in the ATkL seventh mode,
The cue signal can be recorded not only when setting the recording mode, but also every time Bose mode is canceled. Therefore, the cue signal can be recorded for each song with the simple operation of the Bose button. can do. Furthermore, since recording is started by canceling the Bose mode, the confession can be recorded from the beginning, and the first part of the song will not be lost during playback.

FIG. 2 is a circuit diagram showing a specific example of the cue signal generation circuit 12 in FIG.
-L7 is a resistor, CI and C2 are capacitors, DI and D2 are diodes, Ll is a coil, Q1 to Q8 are transistors (6jl), and parts corresponding to those in FIG. 1 are given the same reference numerals.

First, the operation of this specific example in the VTR mode will be explained with reference to FIG. In this figure, signals corresponding to those in FIG. 2 are given the same reference numerals.

Now, when a power supply (not shown) is turned on (time t0), a power supply voltage Vcc is applied, and a resistor 81°R2,R is connected to point A.
A voltage determined by a voltage division ratio of 3 is generated. Specifically, this voltage is 2 (v). The cut-off voltage Vt of the transistor Q5 is 0.6 (V) sb, and since a voltage of 20 is generated at the point A, the base voltage Vbs of the transistor Q5 is not higher than the cut-off voltage Vt. is in the on state.

As a result, the base terminal of the transistor Q3 is short-circuited and is in an off state, and the transistor Q4 is in an on state.

A rotary head (not shown) rotates and a head switching signal e is supplied from the input terminal 11, and this head switching signal e is supplied to the transistor Q3 via the transistor Q2, but the transistor Q3 is turned off. Therefore, it is not supplied to transistor Q4.

On the other hand, since the recording mode signal of 'H' is not supplied from the input terminal 8, the transistor Q7 is in the OFF state. Therefore, the pace voltage of the transistor Q6 is high, and the transistor Q6 is in the OFF state. Therefore, the bias oscillator 13 does not oscillate.

When the recording mode is set in this state, a recording mode signal of 'H' is supplied to the input terminal 8.

However, at the same time, 1 input terminal 10 has a width Δt of 'H'.
A mute signal d of
oscillates frequently.

On the other hand, the mute signal d from the input terminal 10 passes through the diode D2. The amplitude of this signal d is specifically 9(v), and therefore, the amplitude of the signal d is 9(v). c 11d
A voltage of 9 (V) - 2 (V) = 7 (V) C) is applied to charge the capacitor C2, and a voltage of 9 (V) is applied to the capacitor C2 to charge it.

When the period Δt passes and the meate signal d disappears, the transistor Q8 turns off, the transistor Q7 turns on, and the base voltage of the transistor Q6 decreases, turning it on. Therefore, the power supply voltage Vcc is supplied to the bias oscillator 13 via the transistor Q6,
This bias oscillator 13 starts oscillating. The bias oscillator 13 outputs a bias current f' of 7QKHz, and since the transistor Q4 is in the on state, this bias current f' is transmitted to the fixed head 6, the transistor Q4 . Flows through resistor 7. However, since the amplitude is constant, nothing is recorded on the magnetic tape (not shown).

On the other hand, when the mieto signal d disappears, the capacitor C2 begins to discharge through the resistor R5, and this capacitor C
As the charging voltage of 2 drops, capacitor C1 increases resistance i
(+5.R3, 几2.R4 are discharged. This discharge current causes the transistor Q5O base voltage Vbs to drop, and when this becomes below the cutoff voltage vf, the transistor Q5 is turned off. The capacitor C1 is discharged. At the end, it is charged by the voltage of 2V at point A, so that the base voltage Vbs of the transistor Q5 rises and the transistor Q5 is turned on again.

During the off-state period of the transistor Q5, the input terminal 11
The head switching signal e from is supplied from transistor Q2 to transistor Q3. The period in which the transistor Q5 is in the off state is set to such an extent that the head switching signal eo1 pulse is supplied to the transistor Q3, and during this one pulse period, the transistor Q3 is in the on state, and the transistor Q4 is set in the off state. Ru. For this reason, during the period when the transistor Q4 is in the off state, the bias current f'
flows through the fixed head 6, the coil Ll, and the resistor R7, and its amplitude changes. That is, the bias current f' is amplitude-modulated by one pulse of the head switching signal e, and this amplitude-modulated portion is recorded on the magnetic tape by the fixed head 6 as the cue signal f.

When transistor Q5 turns on again, transistor Q4 is kept on again and bias current f' is kept at its original amplitude.

The above is the recording operation of the cue signal f when setting the recording mode in the VTR mode.

Next, the same (Bose mode setting in VTR mode,
The operation of the application signal generation circuit 12 associated with the cancellation will be explained using FIG. 3 as well.

Here, it goes without saying that the recording mode is set and the bias oscillator 13 is operating (10) When the Bose mode is set at time t2, the input terminal 10
A mute signal d is supplied from the transistor Q8, and the transistor Q8 is turned on. Therefore, the transistor Q7 is turned on, and the bias oscillator 13 stops oscillating.

On the other hand, this mute signal d is supplied to the capacitor CI, C, 2 via the diode D2, and the capacitor C2 starts charging. However, at the same time, the ``H'' Bose mode signal C is supplied from the 1st input terminal 9, and this Bose mode signal C sets the voltage at the point ho@ to a voltage equal to the amplitude of the Miete signal d, that is, 9V). To,
Capacitor C1 is not charged because equal voltages are applied across it.

Further, as the voltage at point A increases, the base voltage Vbs of transistor Q5 further increases, and the transistor Q5 is kept in the on state.

Next, at time t8, the Bose mode is canceled and the Bose mode signal C and the Mieto signal d disappear, the transistor Q8 is turned off, the transistor Q7 is turned on, and the bias oscillator 13 starts oscillating. .

At the same time, the capacitor C2 is discharged via the resistor 5, but the capacitor C1 is only charged because the point A has reached 2M at most, and the transistor Q5 remains on.

Therefore, the transistor Q4 remains on, the bias current f' is not modulated, and no cue signal is recorded on the magnetic tape.

The above is the operation associated with setting and canceling the Bose mode in the VTR mode, and no cue signal is recorded.

Next, the operation of the cue signal 12 in ATR mode is as follows.
This will be explained using FIG. In this figure, signals corresponding to those in FIG. 2 are given the same reference numerals.

When the power is turned on now, it is set to the same state as when the power is turned on in VTR mode. When the ATL (mode button (not shown) of the operation unit is operated, the input terminal 7
AIR mode signal a of “H” is supplied, and transistor Q
1 is turned on, and the anode side of the diode D1 to which the Bose mode signal C is supplied is short-circuited. That is, in the ATR mode, supply of the Bose mode signal C is blocked.

When setting the recording mode, the same operation as when setting the recording mode in vT'fL mode is performed, and the fixed head 6V
c, the cue signal f is recorded.

When the recording mode is switched to the Bose mode at time t, the Bose mode signal C is transmitted from the input terminal 9 to the input terminal 1.
The mute signal d is supplied from 0 to 0, respectively, but the Bose mode signal C is blocked by the transistor Q1 which is in the on state. For this purpose, similar to the Bose mode setting in VTR mode, capacitor C2 has a voltage of 9 (v
), and the battery is charged with 7sCl 9 (V) −2(
v) = 7 Ql) Te charge. At this time, transistor Q5 is maintained in an on state. Also, at the same time,
Transistor Q8 turns on and transistor Q7
is not in the off state, and the bias oscillator 13 has stopped oscillating.

Next, when the Bose mode is canceled and the mute signal d disappears, the transistor Q8 is turned off.

When transistor Q7 is on, bias oscillator 1
3 starts oscillation.

At the same time, the capacitor C2 is discharged via the resistor R5, and the capacitor C1 is discharged through the resistors R5, R3, R
2, discharge via R4.

This discharge current causes the base voltage of transistor Q5 to
When bs drops below the cutoff voltage Vt, transistor Q5 turns off. When the capacitor C1 finishes discharging and starts charging by 2 (v) at point A, the pace voltage Vbs of the transistor Q5 rises, and when it becomes equal to or higher than the cutoff voltage Vt, the transistor Q5 is turned on again.

Therefore, in the same way as when setting the recording mode in the VTR mode, one pulse of the head switching signal e is supplied to the transistor Q3 while the transistor Q5 is in the off state, and the transistor Q4 is in the off state, and the bias current f' is Modulated. This amplitude-modulated portion is recorded on the magnetic tape by the fixed head 6 as a cue signal f.

In this manner, a cue signal is recorded on the magnetic tape each time the Bose mode is released, and therefore, a cue signal 1c is recorded for each song, making it possible to search for a desired song.

Note that the above-mentioned specific numerical values are merely shown for the purpose of simplifying the explanation.

Furthermore, although the cueing signal f is made up of one pulse of the head switching signal e, it may be made up of a plurality of pulses. Furthermore, it goes without saying that the above embodiments are suitable for audio signals. Furthermore, it is clear that the information to be recorded in the AT mode may be audio information other than music.

〔Effect of the invention〕

As explained above, according to the present invention, in the AT mode, a cue signal can be recorded for each song, making it possible to search for a song. Since the recording is performed when the mode is set or canceled, the operation for this purpose is simple, and the audio signal to be recorded can be recorded from the beginning without any loss, which is an excellent function not found in the conventional technology mentioned above. video tape recorders.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the video tape recorder according to the present invention, FIG. 2 is a circuit diagram showing a specific example of the cue signal generating circuit of FIG. 1, and FIG. FIG. 4 is a waveform diagram showing signals at each section in FIG. 2 in the AT mode. 1... Eiken signal recording circuit, 2... Audio signal recording circuit, 3... Changeover switch, 4...
...Rotating head. 5.6...Fixed head, 7...ATR
Mode signal input terminal, 8... Recording mode signal input terminal, 9... Bose mode signal input terminal, 1
0...Mieto signal input terminal, 11...
・Head switching signal input terminal. 12...:...Cueing signal generation circuit, 13...
・Bias oscillator. Agent: Patent Attorney Junji Takeshi Department (and 1 other person 1 Figure 1 M2 Figure 3 Figure 4 Sails t213

Claims (1)

[Claims] (1) In a video tape recorder that can selectively set a first mode in which video signals and audio signals can be recorded and a second mode in which only audio signals can be recorded, the first mode A cueing signal generation circuit is provided which generates a cueing signal only when starting the recording mode setting in the second mode, and generates a cuing signal when starting the recording mode setting and when canceling the recording pause mode in the second mode. 1. A video tape recorder characterized in that the video tape recorder is configured to be able to record a cue signal indicating the recording start position of each audio signal in the mode. (2) According to claim (1), the cueing signal generator is supplied with a meet signal at the start of recording mode setting and in the recording pause mode, and in the first mode, the cueing signal generator A cue signal is generated only after the trailing edge of the mute signal at the start of mode setting, and in the second mode, a cue signal is generated after the trailing edge of all supplied mute signals. video tape recorder.