JPS6337862A - Recording residual display device - Google Patents

Abstract

PURPOSE:To display residual event number in response to the recording mode by operating and displaying the recordable residual event number from the information of detected present head track position and recording mode information detected by a mode discrimination means. CONSTITUTION:A present head position detection circuit 92 uses a controller 59 to supply a signal in response to a head position control signal to detect how many tracks are fed by heads 31, 32. A recording/reproducing changeover switch circuit 93 is controlled by a system controller 60 and thrown to the position of a terminal P in loading a floppy and the output of the head 31 is fed to an RF detection circuit 94. The output of the circuit 94 searches the recorded tack and the system controller 60 obtains how many tracks are in use and at what order of track the head resides at present. Further, the system controller 60 discriminates how many tracks are used for one event depending on the recording mode, divides the remaining track number by track number per event and displays the result to a display section 91.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording remaining amount display device for a recording device such as an electronic still camera.

[Summary of the invention]

The present invention is an apparatus capable of recording a video signal and, for example, an audio signal as separate concentric tracks, and is capable of recording a video signal or an audio signal alone, a combination of one field of video signal and audio signal, and one frame of video signal. In an apparatus in which each recording mode of a combination of audio signals can be selected, the remaining recording amount can be displayed in accordance with each recording mode.

[Conventional technology]

In an electronic still camera, one field of video signals is recorded as one annular magnetic track on a video floppy. In this case, there are two recording modes for video signals: "field recording" and "frame recording." In field recording, one field of video signal is recorded on one magnetic track per recording, and frames are recorded. During recording, one frame of video signals is recorded on two adjacent magnetic tracks for one field each. Also, the audio signal is recorded on a separate trunk from the video signal.

The total number of tracks on one video floppy is 50.

In this case, the recording mode of the audio signal is, for example, 1.
A 10-second mode and a 20-second mode are being considered in which audio signals for 0 seconds and 20 seconds can be compressed and recorded into -1 track, respectively.

In addition, when recording these video signals and audio signals, it is necessary to record each signal separately (r * German recording) and to record the two signals in a corresponding manner, for example by recording a corresponding image while recording audio. There is a "correspondence record."

Even in the case of this compatible recording, 1 field recording and 1 frame recording can be selected for the video signal, and 10 second and 20 second modes can be selected for the audio signal.

[Problem that the invention seeks to solve]

By the way, in still cameras, the remaining recordable amount is generally displayed.

An example of this remaining amount display may be to display the number of remaining tracks out of a total of 50 tracks. If the recording mode is the above-mentioned "single recording" mode and is video field recording or audio recording, the number of recordable events and the number of trunks match, so the number of tracks becomes the remaining number of events.

However, in an electronic still camera, two trunks are required for one event in the case of frame recording of a video signal even in "single recording". In addition, in the case of "corresponding recording", two tracks are required for one event when the video signal is field recording, and three tracks are required for one event when the video signal is frame recording. .

Therefore, simply displaying the number of remaining tracks does not display how many more events can be recorded depending on the mode selected by the user, which can easily lead to misunderstandings.

In view of this point, the present invention aims to provide an apparatus that can display the number of remaining events according to the recording mode selected by the user.

[Means for solving problems]

The present invention relates to an apparatus for recording a video signal or an information signal corresponding to the video signal as concentric tracks on a magnetic recording medium, and the present invention provides means for detecting the current trunk position of a recording head on the magnetic recording medium; A mode determining means for determining the recording mode of the signal and/or the information signal, and determining the number of recordable remaining events from the detected current head track position information and the recording mode information detected by the mode determining means. calculation means;
and display means for receiving the output of the calculation means and displaying the number of remaining events.

[Effect]

Currently, it is possible to know how many trunks out of the 50 trunks are left by the head track position detection means. Since it is known from the mode discrimination signal how many trunks are used for l events, the calculation means calculates the number of remaining events that can be recorded, and displays it on the display means.

〔Example〕

FIG. 1 shows an example in which the present invention is applied to an electronic still camera.

First, the recording system in this electronic still camera will be explained.

In Figure 1, (1) is the subject, (2) is the imaging lens, (3) is the shutter, (10) is the video signal system, and (20) is the shutter.
) indicates an audio signal system, and in this example, the shutter (3) is an electromagnetic shutter, and the image sensor (
11) is a CCD having a color separation filter.

In addition, (51) indicates a video floppy, and the magnetic sheet built into this floppy (51) has a rotating shaft (52).
) is rotated by a motor (53) at a field frequency, and magnetic heads (31) and (32) are placed in contact with the magnetic sheet. In this case, these heads (31) and (32) are provided at equal angular positions with respect to the rotating direction of the magnetic sheet, and so as to be in contact with adjacent magnetic tracks, respectively.

These heads (3, 1) and (32) are configured to be movable in the radial direction of the magnetic sheet by a motor (58), and a predetermined drive voltage is supplied to the motor (58) from a controller (59) to drive the heads. (31).

(32) The trunk position on the magnetic seat can be changed arbitrarily.

(60) shows a system controller that controls the overall operation of this camera. This system controller (60) is composed of a micro combinator, (61) is its CPU, and (62) is a system controller that controls various processes. The ROM in which Progera 6 is written, (63) is the RAM for the work area, (64) is the input port, and (65) is the output port. These circuits (62) to (65) are connected to the system bus (
66) to the CPU (61).

This system controller (60) includes a shutter switch for photography (71), an audio recording switch (72),
A mode switch (73) for selecting field recording and frame recording and a detection switch (74) are connected. The detection switch (74) is for detecting when a floppy disk (51) is set in this camera. Further, (75) is an audio mode selection switch for selecting either the 10 second mode or the 20 second mode as the audio signal recording mode.

Further, a pulse generating means (54) is provided opposite to the center core of the floppy disk (51).
) Each time the magnetic sheet rotates once, one pulse PC is extracted as a signal indicating the rotation phase, and this pulse PC is sent to the system controller (60) through the shaping amplifier (55).
from the system controller (60) to the switch (71).
) to (75), various control signals are taken out at predetermined timings. In addition, from the system controller (60), there is a circuit (15).

(28), J33), and (34) are also supplied with respective control signals.

Furthermore, (80) shows a clock forming circuit, to which control signals from the pulse PG and the system controller (60) are supplied, various clocks are formed at predetermined timings, and are supplied to the respective circuits. .

As shown in FIG. 2A, when the shutter switch (71) is pressed at an arbitrary time t1, a control signal is supplied from the system controller (60) to the shutter (3), and as shown in FIG. The shutter (3) opens for t2 and the image of the subject (1) is projected onto the CCD (11), and C0D (11
) a charge image is accumulated.

Then, when the switch (73) is set to the field recording mode, as shown by solid lines in C and D of the same figure, the time t of the first pulse PG after the time t2
3, from this time t3 to the time t of the next pulse PC
The formation circuit (80
) supplies the read clock RDCK to the CCD (11), and the color video signal Sc for one field is taken out from the CCD (11) as shown by the solid line in FIG.

This signal Sc is then supplied to the video processing circuit (13) through the preamplifier (12), where the luminance signal and color signal are extracted from the signal Sc, and these signals are transferred to the recording circuit (13).
4) and has data such as field recording or frame recording.
d is supplied from the system controller (60) to the recording circuit (14). The sum of the line-sequential FM signal modulated by the line-sequential FM signal and the SK signal modulated by the data signal Sd is defined as Sv.

This signal Sν is supplied to the switch/7 circuit (15), and the switch circuit (60) is supplied from the system controller (60).
15), the signal Sv is taken out during the period t3 to t→ as shown by the solid line in FIG. It is supplied to the recording head (31) through the video side contact of the circuit (33) and the floppy disk (
51) as a single circular trunk.

On the other hand, when the switch (73) is set to the frame recording mode, the signal RDC changes to C0D( 11), and therefore, as shown by solid and broken lines in E and F of the figure, at time t3
A signal SC+Sv is extracted from each frame over one frame period t3 to t6.

Then, the signal Sν passes through the switch circuit (15) and the recording amplifier (16) to the switch circuit (33) (34).
) and switch circuits (33) (34
) is controlled by the system controller (60), and the signal Sν during the first half field period t3 to t4 is controlled by the switch circuit (33).
The signal Sv of the latter field period t4 to t5 is supplied to the head (32) through the switch circuit (34). Therefore, one frame of signal Sv is recorded on the floppy disk (51) as two adjacent magnetic tracks.

Next, a case will be described in which an audio signal is recorded in correspondence with a video signal. First, as shown in FIG. 3A, when it is desired to record audio together with video, the recording switch (72) is turned on during an arbitrary period Ta. Then, each time the shutter switch (71) is pressed within the on-period Ta, audio signals for 10 or 20 seconds before the on-time Vs of the shutter switch (71) are recorded. That is, the audio signal Sa from the microphone (21) is supplied to the low-pass filter (23) through the preamplifier (22), and is filtered by, for example, 5 kllz.
The following signal Sa is band-limited and extracted, and this signal Sa is supplied to a time axis compression circuit (25) through a recording noise reduction circuit (24). This compression circuit (25) is composed of, for example, an A/D converter, a memory having a capacity for 20 seconds, a D/A converter, and a memory controller that controls writing and reading of the memory. As shown in B and C, the signal S
a is A/D converted and sequentially written into the memory according to the 10 seconds mode and 20 seconds mode, and when the shutter switch (71) is pressed, writing to the memory stops at that point vS, and the 10 seconds or The audio signal for 20 seconds is read out at a faster speed than when it was written so that it becomes one trunk (one field period), and this is read out from the D/A.
This compression circuit (25) is converted as an output signal St.
More can be obtained.

Then, this signal St passes through the adder circuit (26) to the FM
This signal Sf is supplied to the switch circuit (28), and a control signal is supplied from the system controller (60) to the switch circuit (28) to convert the signal Sf into an FM signal Sf. During the period St, the signal Sf is extracted, and this signal Sf is supplied to the recording head (31) through the recording amplifier (29) and the switch circuit (33), and is sequentially recorded on another track of the floppy disk (51).

Also, at this time, from the system controller (60) to the encoder (4)
1), and an identification signal Si is generated for each signal St, as shown in the third diagram, for example. This signal Si includes, when a certain signal St, a flag indicating whether the signal St is the last signal, that is, whether the signal St continues thereafter, and a code indicating the track number when the trunks are continuous. It has signals etc.

This signal Si is then supplied to the adder circuit (26), added to the signal St, and recorded on the floppy disk (51) as the signal St as described above.

The switch (76) is a switch that is pressed during continuous audio recording, and if you press this switch (76) and then press the switch (72), the recording will start for 10 or 20 seconds from the time you press the switch (72). Each time, the audio signal is taken into the memory, compressed, read out, and only the audio signal is recorded in each trunk.

In consideration of this continuous recording, one pair of memories of the compression circuit is prepared.

The above is the basic configuration and operation of an electronic still camera that can also record audio.

Next, the display of the remaining capacity of the floppy disk (51) will be explained.

Reference numeral (91) is a display section for displaying the number of remaining recording events, for example, a liquid crystal display. Further, (92) is a current head position detection circuit, and in this example, a signal corresponding to the head position control signal is supplied from the controller (59) to this detection circuit (92), and the head (31) and (32)
) is sent by this detection circuit (92). Head (31) (32)
When a floppy is loaded, the position is always reset to the outermost position at the start of recording, and the output of the head position detection circuit (92) is the current head position (trunk) based on the recording start position. position).

Further, (93) is a recording/reproduction changeover switch circuit for the heat exchanger (31), which is switched and controlled by a changeover signal from the system controller (6o). This switch circuit (93
) is normally connected to the terminal P side, and the switch circuit (
33) are supplied with recording signals.

When loading a floppy disk, this switch circuit (93
) is connected to the terminal P side, and the output of the head (31) is R.
The signal is supplied to the F detection circuit (94), and it is detected whether or not there is a high frequency component, that is, a recording signal, in the reproduction output of the head (31). The detection output of this RF detection circuit (94) is input to the system controller (60), and when there is a recording signal, a signal to send the head (31) further from the controller (59) is supplied to the motor (58). The head is made to stop at the non-recording track position. That is, as described above, a recorded trunk is searched when a floppy disk is loaded. From the output signal of the head position detection circuit (92), the system controller (60) determines how many tracks have been used and what trunk number from the first trunk the head position is currently on.

Also, in the system controller (60), the switch (72) (73
) and (75), the number of tracks to be used for one event is determined from the recording mode corresponding to each state.

Then, in the system controller (60), the number of remaining tracks is obtained by subtracting the number of tracks at the current head position from the total number of trunks, 50, and the number of remaining events is obtained by dividing this number of remaining tracks by the number of trunks per event. , this is displayed on the display section (91).

In this case, if there is a remainder after division, it is rounded down and displayed as an integer on the display section (91).

Of course, the remainder may be displayed.

For example, if the floppy (51) is unrecorded,
The current head position is the recording start track position, and 50 tracks remain as they are. Therefore, in the case of single recording of one field of video signal or audio signal, the remaining number of events is displayed as "50".

When in recording mode of 1 field of video signal + audio signal or frame recording mode of video signal alone, 5
The remaining number of events is displayed as "25" based on 0÷2-25.

When in recording mode of one frame of video signal + audio signal, 50÷3-16 2. The remaining number of events is displayed as "16".

For example, when a floppy disk with 10 trunks recorded is loaded, the head is sent to the 11th rank position, that position is detected as the current head position, and the number of remaining tracks is calculated as 40. and the number of remaining events is r40J corresponding to each of the above modes.
, r20J, r13J are displayed.

Then, when the switches (72, 73) and (76) are operated to change the mode and the number of trunks per one event changes, the remaining event number on the display (91) will change depending on the mode. The remaining amount of events will change accordingly.

Note that when loading a floppy disk, the search for recorded tracks can be prevented by using a switch (not shown) provided on the system controller (60), so even if a used floppy disk is used, the search for recorded tracks can be disabled from the beginning. It will be possible to start over again.

Note that the current head position on the magnetic sheet can also be known as the stroke amount from the outermost track position where the head starts recording. In this case, since the track pitch is constant, the current hend track position can be determined by dividing the stroke amount by the track pitch.

Furthermore, the current head position detection means may have various other configurations.

〔Effect of the invention〕

According to this invention, at the time of recording, instead of the number of remaining trunks,
The number of remaining events can be displayed according to the recording mode. Therefore, the user can immediately know how many more scenes can be recorded in that recording mode.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of a recording apparatus to which the present invention is applied, and FIGS. 2 and 3 are diagrams for explaining the same. - (,31) and (32) are magnetic heads, (51) is a video floppy disk, (58) is a motor for moving the head, (
60) is the system controller, (71) is the shutter switch, (7
2) (73), (75) and (76) are switches for setting the recording mode, and (91) is a display section. −Agent: Sadado Ito Hidemori Matsukuma

Claims (1)

[Claims] An apparatus for recording a video signal or an information signal corresponding to the video signal as concentric tracks on a magnetic recording medium, comprising: means for detecting the current track position of a recording head on the magnetic recording medium; , a mode determining means for determining the recording mode of the video signal and/or the information signal, and a recordable remaining amount event based on the detected current head track position information and the recording mode information detected by the mode determining means. A recording remaining amount display device comprising a calculating means for calculating the number, and a display means receiving the output of the calculating means and displaying the remaining amount event number.