JPS6065677A - Image pickup recorder - Google Patents

Abstract

PURPOSE:To attain miniaturization and light weight by decreasing the rotation radius of a head and a drum radius without modifying a tape format. CONSTITUTION:Heads 1A, 1B are rotated at a field frequency, a tape 2 is run over a wider angle range to a rotating circumferential face to reduce the rotation radius moreover, the vertical scanning of the image pickup tube is conducted during the period while the tape 2 runs in contact with the rotating circumferential face and corrects the horizontal scanning frequency of the image pickup tube in response to the vertical scanning.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a device that integrates a video camera and a VTR.

BACKGROUND TECHNOLOGY AND PROBLEMS A so-called 8mm video is being considered as a system that integrates a video camera and a VTR and is miniaturized.

In this 8mm video, the output signal of the image pickup tube is processed to extract a luminance signal and red and blue color difference signals.
The luminance signal is converted to an FM signal, and the color difference signal is converted into a carrier color signal (fill transmission frequency re) distributed below the FM signal, and this carrier color signal and the FM signal are added to form the FM signal. The sum signal 5I11 as shown in FIG. 1A is obtained. However, at this time, the phase of the carrier color signal is controlled so that the frequency is interleaved with each other in the odd field period and the even field period, and for example, the phase is kept unchanged for one field F1lJI Ta. and 1 in the other field period Tb.
The phase is inverted every horizontal period.

Further, as shown in FIG. 1, if the period Tp is, for example, the first 1/6 field period of one field period, the audio signal is converted into a PCM signal and is time-axis compressed as shown in FIG. 1B. It is assumed that the PCM signal Sp is located in the period Tp.

The first of these signals Sm and Sp are signals Sa and Si as shown in ]C and D, that is, the signal Sa has the signal Sm in the odd field period and the signal Sp in the subsequent period Tp. The signal sb has the signal Sm during the even field period and the signal Sp during the following period Tp.
has. These signals Sa and Sb are then supplied to the rotating magnetic heads (]/l) and (IB), respectively, as shown in FIG.

The heads (IA) and (]R) have different angles of angle, and are rotated at a frame frequency with angular intervals of 1) 30°.

The magnetic tape (2) is run obliquely at a constant speed over an angular range of just over 201' with respect to the rotating peripheral surface of the heads (1/l) and (IB).

Note that (4) is a tape guide drum.

Therefore, as shown in FIG. 3, the signal arrays Sa and Sb are formed as one diagonal magnetic track (3) for each field.
Further, the signal Sa is recorded as every other track (3A) of the trunk (3), and the signal sb is recorded adjacent to H) as every other remaining trunk (3B).

And at this time, tape (2) is head (IA)
.

(1B) extends over an angular range of just over 210° with respect to the rotational surface of (1B), and the signal Sm in the signals Sa and Sb is a) 'i i! 2'shi,
Since the signal Sp is set to 0 in the subsequent 1/6 field period Tp, the signal Sm is recorded in the section corresponding to the first 180° period in track (3), and the remaining 30°
Even if the signal Sp is recorded in the section corresponding to the period). Further, the azimuth angles of the tracks (3/l) and (3B) are different from each other corresponding to the azimuth angles of the heads (18) and (ill).

The following is the recording process for 8mm video.

Note that the signal can be reproduced by performing the procedure and processing reverse to those described above.

This 8mm video requires a tape guide tram (4) to run around the rotating surface of the tape (2) or spatulas (IA) and (IR), but this drum (4) ) becomes larger in size, not only the drum (4) but also the mechanism for loading the tape (2) becomes larger, resulting in the overall size of the device becoming larger and smaller in size.

Therefore, in order to make the device smaller and lighter, the head (
], A), (IB) and the diameter of the drum (4) are preferably small, but these are determined by the tape former shown in FIG.

Purpose of the Invention In view of the above points, the present invention provides a tape format that can be used without changing the tape format shown in FIG.
, (IB) and the diameter of the tram (4), thereby making the device smaller and lighter.

Summary of the invention Therefore, in this invention, the head (IA).

(IB) is rotated at a field frequency, and the tape (2) is run over a wider angular range with respect to its rotating circumferential surface, thereby reducing its rotation radius.
The image pickup tube is vertically scanned while the tape (2) is running in tandem with the rotating circumferential surface, and the horizontal scanning frequency of the image pickup tube is corrected in accordance with this vertical scanning.

Embodiment In FIG. 4, (11) indicates a color image pickup tube. In this example, this image pickup tube (11) is a phase separation type color image pickup tube with a color separation filter, and the luminance signal sy
A composite signal Sk of the carrier color signal and the index signal is made to be (η).

Further, in the signal forming circuit (41), the vertical deflection signal S
v'' and a horizontal deflection signal Sh' are formed, and these signals sh'' (, 5vN correspond to the deflection of the image pickup tube (11) (1).
2).

In this case, qle ii! Frequency fv of deflection signal Sv'
is the 111 direct frequency f V in the N T S C system
(= 59.9411Z), or the frequency fh'' of the water i (i deflection beam sh' is 1.5 of the horizontal frequency fh ('l; 15.734kllz) in the NTSC system.
It is said to be twice the frequency. Therefore, one period Ta for one file,
Th is shown in Figure 5), 393.7511'
(1 horizontal period in il+' and other Jr+S1.X)
It is.

Also, the vertical deflection signal Sv',! ;I, As shown in FIG. 5B, one field period Ta has a period Tvl'' of 262.511' from its start point, corresponding to one end from the level corresponding to one end of the screen. The remaining field period 'rh has a level corresponding to 11 = edge of both sides, and the remaining field period 'rh has a level corresponding to 1.7511' from its starting point. Similarly, during the delayed period Tv'' of 262.511', the signal changes in a sawtooth pattern, and the remaining period 1tt1 of 1..7511' and 129°5110 is a signal at a level corresponding to the upper edge of the screen.

tjfl, a composite signal Sk' is obtained from the image pickup tube (11) during the Tl-j direct scanning period Tv' by the signal Sv', as shown in FIG. 5C. Note that this signal S
The field frequency fv of k'' is the standard value fv, but the horizontal frequency fh'' is J5 times the standard value fh.

Then, this signal Sk' is sent to the preamplifier (13) and supplied to the 1ζ luminance signal processing circuit (4), where the luminance signal Syl'l is taken out, and after AGC etc. are performed, the FM modulation circuit (15) is converted into the °ζFM signal Sf''.The frequency of this signal Sf' is
That is, the frequency of the signal Sf') at the whitebeak level or synchronization level of the signal sy'' is set to be 1.5 times that of the FM signal applied to the signal Sm in FIG.

This signal Sf'' is then supplied to the adder circuit (16).

Further, the signal Sk' from the amplifier (13) is fed to a color signal processing circuit (21), where red and blue color difference signals are taken out, and these color difference signals are supplied to a modulation circuit (22) and formed. A carrier wave signal is supplied from circuit 118 (, u), and its color difference signal is a carrier color signal (quadrature two-phase balanced modulation signal) Sc''.
The j shipway frequency fcH is set to be 1.5 times the 1 shipway frequency fc of the 1 ship speed color signal in the signal Sm of FIG. 1A.

In addition, for example, by controlling the phase of the 1-speed transmission signal supplied to the old m path (22), the signal Sc' becomes 1
Frequency interleaving is performed every field period, and for example, during period Ta, the reference phase is set, and during period Tb, the phase is inverted every 11 steps.

Then, the signal Sc'' is supplied (It) to the adder circuit (16), and from the adder circuit (16), the signals s, A sum signal Sm'' is taken out.

Furthermore, the audio signal from the microbon (31) is supplied to the ζPCM modulation circuit (33) through the preamplifier (32), and as shown in FIG. 7511' for one month Tpl'', it is converted into a PCM signal S p H that is transmitted to the device a).In this case, the frequency of this signal Sp'' is 1.5 times the frequency of the signal sp in Fig. 1B. be done.

Then, this signal l+Spl'' is 1 switch time (34Δ
).

(J() is supplied to (34B), and at the same time, signal Sm' is supplied to switch circuit (178) and (17B). ~
A control signal is supplied to (34B), and the output signals of Suisona circuit 1+'8 (178) and (348) are supplied to an adder circuit (188), and the switch circuit (1,7B)
, (34B) is supplied to the adder circuit (1BB). In this way, from the adder circuit (188), as shown in FIG.
, and a signal Sa' having a signal 5p11 is taken out from the adder circuit (18B) in the following period Tp'', and a signal Sm' is taken out from the adder circuit (18B) in a period Tv' of the period Tb as shown in FIG. The signal s with the signal s p H in the following period Tpl'
b' is taken out.

Then, these signals Sa'', sb'' are sent to the head (18), (I) through the recording amplifier (198), (19B).
B). In this case, head (1Δ), (iB
) whose angular spacing corresponds to 1.7511'', and the head (18) is made to rotate in advance and is rotated at the field frequency fV.

Also, at this time, the radius of rotation of heads (I8) and (IB) and the diameter of l.ram (4) are approximately 75% larger than those of No. 2121, and over an angular range of over 280°. The tape (2) is run diagonally.

(To be more precise, the rotation radius of the navel I'' (IA), (IB>) and the diameter of the drum (4) are slightly smaller than 75% of those in Figure 2, and the diameter of the tape (2) is The inclination angle (lead angle) with respect to the drum (4) is slightly different from that in Fig. 2, but detailed numerical examples thereof will be omitted.) Therefore, the signals Sa' and Sb'' are The tape (
2) is recorded. Also, at this time, het (IA)
, (In) and the tape (2) is f compared to the case of FIGS. 1 and 2.

, and the frequencies of the signals Sa'' and Sh' are the first
Compared to the cases shown in Figs. 1 and 2, the recording wavelength on the track is 1.54 + η, so the recording wavelength on the track is the same as in Figs. 1 and 2, that is, the signal Sa ”
.

In this case, as shown in FIG. 5, the recording section of the signal Sm'' in the signal Sa' + Sb' is the rotation angle range of the heads (1^)', (IB) 2
The recording interval of the signal Sp'' is a 40' interval.

Thus, according to the present invention, it is possible to record video and audio, but in this case, especially according to the present invention,
Head (]8), (IB) half rotation and drum (
4) can be reduced by 9%, and the mechanism for loading the tape (2) can also be made smaller.Therefore, the whole can be made smaller and lighter, which is preferable for portable machines.

By the way, there is another standard for 8mm video called the timeplex format and Ilf.

FIG. 6 shows the time-plex recording method (Ill marks one horizontal period in the NTSC system).

However, by processing the output signal of the image pickup tube, the sixth
As shown in FIG. 6A, the luminance signal W Sy is continuously extracted, and as shown in FIG.
RY), CB-Y) lines h1α order multiple Si are continuous'
ζ is taken out. And Shin Jr.) Sy is the 6th
As shown in Figure C, the time axis is compressed to one horizontal period.
It is assumed that the luminance signal Sy is placed in the period 1y of = 4/5H, and (the 100th Si is compressed on the time axis as usual in Figure 6, and then 1
It is assumed that the line sequential signal Si° is located in the period t1 of 15H.

Then, as shown in FIG. 6E, the signal sy'' and the signal Si
° is taken out at the intersection t'I- to produce a continuous signal Ss'', and this signal Ss'' is converted into an FM signal Sn as shown in FIG. 6F. The signal shown in FIG. 7A is used in place of the signal Sm.

A signal Sa similar to the 11th fflC and D as neo-B.

sb, and these signals Sa and Sb are shown in Fig. 2, 7F (
IA), (IB) and recorded as a border in the third and first.

The above is the method for recording 8mm video using the timeplex method. Note that the signal can be reproduced by the reverse procedure and processing to those described above.

FIG. 8 shows a case where the present invention is applied to a timeplex type device.

That is, in FIG. 8, from the forming circuit (41) to the deflection coil (12), as described above! I (direct deflection (t ”T
S v '' and the horizontal deflection signal %Sh' (l is supplied.

In this case, the frequency of the signal sh' is equal to the above-mentioned frequency fh''
However, as shown in Figure 9A, the waveform is
Lj in the intercostal space 1,'' of 1511X: changes in a sawtooth pattern from the level corresponding to the left edge of the i+Ii plane to the level corresponding to the right edge of both sides, and the remaining period t of 1&l/511'
,. The waveform is reset to a level corresponding to the left end of 2 + i, and the current signal Shu is supplied to the deflection coil (12). Therefore, ′ζ, lmost image tube (1
1), as shown in FIG. 9B, a composite signal 51 (0
is taken out.

Then, this signal Sk' is supplied to the luminance borrowing processing circuit (4) through the preamplifier (13), and the luminance signal Sy0 is time-axis compressed into a period 1y as shown in FIG. 9C.
is taken out, and this borrowed amount 5y0 is transferred to switch times 11R (5
3).

Furthermore, the signal 51 (0) from the amplifier (13) is supplied to the color signal processing circuit (15) (JL as shown in Fig. 9). Time axis compressed red and t¥ color difference signals (RY) 0. (B
-Y)° is taken out, and this signal (RY)', (B-
Y)u is supplied to the switch circuit (51), and the formation time 1? h (old), a control signal whose level is inverted every horizontal period is supplied to the switch circuit (51), and from the switch circuit (51), as shown in FIG.
A line ll+a next signal \rSi' having signals (R-Y)u and (B-Y)' alternately at 0 for each horizontal period is taken out.

And this signal SiU has a time axis length of 41511''
memory, in this example C0D (52), and is also supplied to C0D (52) from the formation circuit (old) during period tXU.
2), the xl write clock WR is supplied, and furthermore, in the following period t1°, the dh read clock RD having a frequency four times that of the write clock WR is supplied from the formation circuit (41) to the CCD (52). Therefore, from the CCD (52), signals as shown in the first) and IG, '・1-,
The signal Si' is 4/! The time axis is compressed in 'ill', and the CCD (52) outputs ν (read at four times the reading speed), so the CCD (52) outputs the time in the period t1°. A signal St'' whose axis is time-axis compressed to 115+1'' is extracted.

Then, the signal Si0 for each degree ζ is supplied to the switch circuit (53), and the signal Si0 for each period t, 11 is supplied from the formation circuit (41).
A control signal whose level is inverted between and period L1° is supplied to the switch circuit (53), and from the switch circuit II (53), a signal having the signal sy0 and the signal si9 alternately as shown in FIG. Ss' is taken out.

Then, this signal Ss” is FM change IM times 17&(54)
is supplied to the FM signal Sn" with a frequency 1.5 times that of the FM signal Sn in FIG.
n'' is supplied to the switch circuits (17^) and (]-7B), and instead of the signals Sm''' of FIGS. 4 and 5 F and G, signals Sa' and Sb' having double IMSna are obtained , these signals Sa', Sb'' are the head (IA),
(Ill) ni (Ill be paid.

Therefore, video and audio are recorded in the same recording format as the Time Presso method.

In the tenth description, a CCD or the like can be used instead of the image pickup tube (11) as the image pickup device.

Effects of the invention: The tape guide drum can be made smaller, and the whole can be made smaller and lighter.

[Brief explanation of the drawing]

1 to 3; FIGS. 5 to 7; and FIG. 9 are diagrams for explaining this invention, and FIGS. 4 and 8 are system diagrams of an example of this invention. (14) and (21) are signal processing circuits, (15) and (
33) is a variable i-circuit circuit.

Claims (1)

[Claims] an image sensor and a rotating magnetic head, the horizontal scanning frequency of the image sensor is set higher than a standard value, and -1 - only during a period in which the number of horizontal scanning periods in the image sensor is equal to the standard value; - Effective vertical scanning is performed on the image sensor F, and the video signal from the image sensor is
It is intermittently supplied to the rotating magnetic head only during the period when the effective vertical scanning is being performed, and during the period when the effective vertical scanning is not being performed, and the above-mentioned 9Jt vertical scanning is being performed. During the continuous period, an intermittent audio signal compressed in the time axis is supplied to the rotating magnetic head, and the rotating magnetic head is rotated at the field frequency, and the rotation surface of the rotating magnetic head is rotated at the field frequency. Of these, the period during which the above-mentioned effective vertical scanning is performed and "1"
A magnetic tape is run diagonally at a predetermined speed over a section corresponding to the period of the intermittent audio signal, and a video (g
An imaging recording device in which a signal and an audio signal are recorded on one magnetic track for each field period.