JPS60134682A - Time axis compandor - Google Patents

Abstract

PURPOSE:To perform compression and expansion of time axis by simple constitution by driving n-stage delay element driven by a clock signal changing clock frequency at proper point of time. CONSTITUTION:Continuous signals 68, 69 of frequency f and kf (k: compression ratio) are generated by horizontal synchronizing signals 31, PLL65, a gate signal 70 is generated by a gate signal generator 66, and further, clock signals 71- 74 are generated by a gate 67. When compressing R-Y signal, a signal 71 is prepared selecting continuous waves 68 and 69 by a signal 70 and gate 67 to make frequency f until time tS1 and kf... after tS1 in C1 period by CCD32 and in compressed R1 period. In this case, period xT in the figure is set to make xTf= {n-(1+ka)Tf}/(1-k) when CCD is n-stage. Thus, the signal of period C1 is compressed to k times in R1. As to compression of B-Y signal in C1 period by CCD34, a signal 73 is formed to become frequency f until time tS1 and to become kf... until time tS'1 and after stopping.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a time-base compression/expansion device that obtains high-quality signals with a simple configuration in recording, reproducing, and transmitting video and audio signals.

Conventional Structures and Problems Currently, the mainstream of magnetic recording and reproducing apparatuses (hereinafter referred to as VTRs) is of the helical scan type in which a rotating head forms video tracks diagonally on a tape. In particular, home VTRs are becoming smaller and more dense. For example, in a VH8 type VTR, a video signal is recorded obliquely onto a tape having a width of 1.5 inch by two video heads arranged at an angle of 1800 degrees to each other on a rotating cylinder having a diameter of 62 mm. Furthermore, in the field of broadcasting VTRs, portable news gathering (ENG) VTRs are desired to be smaller and lighter in weight, and X-inch υ standard VTRs are also widely used. ENG VTRs are required to be small and lightweight, and also to have high image quality because they are used for 3-1 broadcasting. % inch U standard VTR has a cylinder diameter of 110 mm and a tape width of % inch, so there are limits to miniaturization.In addition, as a recording method for video signals, the luminance signal is made into a frequency modulated wave and the low frequency is removed. Since a method of superimposing a carrier chrominance signal converted to a low frequency band is used, the bands of the luminance signal and chrominance signal are limited, and the image quality is not necessarily sufficient for broadcasting. FIG. 1 shows the recording pattern of an NTSC % inch U standard VTR. In FIG. 1, TW, Tp,
TB represents video track width, video track pitch, and space, respectively, and TW: 85 p m
, T p =137 pm, T B =52
It is μm.

Taking the above points into consideration, a device that is small, lightweight, and can obtain high-quality reproduced images has been proposed (Patent Application No. 5e-4819).
According to this system, high quality images can be obtained even with a cylinder diameter and cassette of the same size as a home VTR, and the system can be made smaller and lighter than a conventional ENG VTR.

Fig. 2 is a plan view of the head arrangement on the cylinder used in this method, Fig. 3 is a front view of the head, Fig. 4 is a diagram showing an example of the recording pattern by the head, and Fig. 6 is the head arrangement. FIG. 6 is a block diagram of an embodiment of the recording method according to FIG. 6, and a waveform diagram of the main part in FIG. 5 is shown, and the recording method according to FIG. 6 will be explained.

In Figures 2 and 3, A, A/ and B='B
' represents two sets of heads arranged at the same height 1800 on the cylinder circumference. Also, A and A in Figure 4
', B, B' (dA, A/, B respectively
, represents the entire trajectory written in B/Herad. In Figures 3 and 4, TA and TB are A (A/) and B, respectively.
(B represents the track width of the head, TP represents the track pitch, and Ts represents the space. Now, the diameter of the cylinder is 2 revolutions, the values of X and y in Fig. 3, TA, TB, T
By appropriately determining the sO value, the tape speed, and the angle between the tape and the recording trajectory, the head arrangement as shown in FIGS. 2 and 3 can produce a trajectory as shown in FIG. 4. - For example, it is possible to construct a VTR that has a cylinder with the same diameter as a VH8 system VTR and is capable of recording approximately 2.5 bases of VHS cassette.

One method for recording and reproducing color video signals with the recording and reproducing apparatus described above is to record and reproduce a luminance signal (frequency modulation) using the A head and a chrominance signal (frequency modulation) using the B head.
There is a way to record. In this way, the track width of the luminance signal can be increased, and since the color signal is not superimposed, the band can be widened, and a reproduced image with high S/N and high resolution can be obtained. Furthermore, since the color signal can be recorded by frequency modulating the baseband signal (for example, the RY signal and the BY signal), it is possible to obtain a reproduced signal with a high S/N in a high band. In the above example, it is configured with a cylinder with the same diameter as a VH8 system VTR, and can record approximately 20 minutes on a VHS cassette, making it smaller, lighter, and of higher quality than before.
A G VTR can be constructed.

The recording method shown in FIG. 6 will be explained below in accordance with FIGS. 4 to 6. In Fig. 6, 1 is a Y signal (luminance signal) input terminal, 2 is an RY signal input terminal, 3 is a B-Y signal input terminal, 4 is a time axis compressor, and 6 is a frequency modulation terminal. 7 and 8 are recording amplifiers, 9 and 1° are video heads, 11.12 are playback amplifiers, 13.14 are frequency demodulators, 16 are time axis expanders, 16 are Y signal output terminals, and 17 are R -Y signal output terminal, and 18 is a B-Y signal output terminal.

In addition, in Fig. 6, 1.2.3 are the input Y
Signal, R-Y signal, B-Y signal waveform (R-Y.

For convenience, a horizontal synchronization signal is also added to the B-Y signal.

) 19 is the waveform of the output signal of the time-base compressor 4, which is the waveform at each number in FIG.

The Y signal applied to the Y signal input terminal 1 is transmitted to the frequency modulator 6.
After being modulated by the recording amplifier 7 and amplified by the recording amplifier 7, the signal is recorded on the tape by the head 9. The Y signal has a band of about 4.5 total, and in order to record and reproduce this signal with good performance, the modulation frequency shift is set to, for example, 5 to 7. R-
The R-Y signal and B-Y signal applied to the Y signal input terminal 2 and the B-Y signal input terminal 3 are converted into one line (1H) by the time axis compressor 4 as shown in waveform 19 in FIG. R in the first half of
-Y signal, time axis compressed as B-Y signal in the second half 7
1, -7 is synthesized. This signal is modulated by a frequency modulator 6,
After being amplified by a recording amplifier 8, the signal is recorded on tape by a Herad 1°. Since the R-Y signal and the B-Y signal have a total band of approximately 1.6, each signal is time-axis compressed to % (R-Y).

(denoted as B-Y) has a total of approximately 3 bands. The frequency shift of this composite signal is set to 3.5144r-5M, for example. The tape pattern in which the Y signal and color signal are recorded by the two pairs of heads having the structure described above is the fourth one.
It will look like the figure. In Figure 4, A.

A' is B of the Y signal, and B/ is the recording locus of the color signal.

As shown in Figure 4, regarding the Y signal, the conventional VH8
The track width is wider than that of a VTR, and since the FM carrier frequency is low and the band is about 3, the color signal can be reproduced with good S/N even if the track width is narrower than that of the Y signal. When regenerated, Y regenerated from Herad 9
The signal is amplified by a regenerative amplifier 11, demodulated by a frequency demodulator 13, and a reproduced Y signal is obtained at an output terminal 16. On the other hand, the color signal reproduced from the head 1o is transmitted to the reproduction amplifier 12.
After being amplified by the frequency demodulator 14 and demodulated by the frequency demodulator 14, it is expanded by the time axis expander 15 and separated into the original R-Y signal and B-Y signal. signal,
A B-Y signal is obtained.

As explained above, according to the method shown in Fig. 5, it is possible to obtain high-quality reproduced images, but the rotary head not only handles one type of video signal, but also high-quality audio signals (PCM) and text. There are also many requests to record information such as still images and simple videos (animations, etc.).

One way to avoid this is the method described below.

In the configuration shown in FIG. 5, the band of the Y signal is 4.6, while the band of the compressed color signal is 3. Therefore,
Make the head width A, A/ larger than B, B/,
The S/N is balanced. Now head A, A
/ and B, and by setting the width of B/ appropriately, head B
, B/ can record higher frequencies.

That is, the compression ratio of the color signal is increased to 6/2, for example, compared to the double in FIG. 6, and 115 of one line other than the color signal can be used for other signals. At this time, the band of the compressed color signal becomes 3.751M. FIG. 7 shows an example of recording a time-axis compressed digital audio signal and two color signal components with one head in this way. FIG. 8 shows the waveforms of each part in FIG. 7, and will be briefly explained. In Figures 7 and 8, the 6th
The same numbers as in the figure and FIG. 6 represent the same things and operate in the same way. 21 is the audio signal input terminal, 22 is the color signal time axis compressor, 23 is the audio signal digital converter, 24 is the adder, and 26 is the audio signal input terminal. 26 is a digital audio signal demodulator, and 27 is an audio signal output terminal. Recording and reproduction of the Y signal is the same as in the case of FIG.

RY and B-7 signals entered into terminals 2 and 3 (Fig. 8 2 and 3
) is the time axis compressor 22, as shown in FIG. B-Y until the end
The signal is compressed as (B-Y). On the other hand, terminal 21
The input audio signal 10Bair (FIG. 8, 21) is converted into an audio signal digital converter 23.
As shown in FIG. 8 and 29, the signal is converted into a digital audio signal that is time-base compressed into % portions starting from the front of one line. The color signal 28 and digital audio signal 2 compressed in this way
9 are added by the adder 24, synthesized in the form shown in FIG. It is recorded on tape through Herad 1o.

During playback, the signal that has been regenerated and demodulated by the regenerative amplifier 12 and frequency demodulator 14 is restored to the original RY signal and BY signal by the time axis expander 16, and is obtained at terminals 17 and 18. On the other hand, the reproduced signal is sent to the digital audio demodulator 26.
(The audio signal is guided back to the original audio signal and obtained at the terminal 27.

Next, regarding the color signal time axis compressor 22 and decompressor 26,
An example will be explained below. FIG. 9 is a block diagram of an embodiment of a time axis compressor, FIG. 10 is a waveform of each part of FIG. 9, FIG. 11 is an embodiment of a time axis expander, and FIG. 12 is a block diagram of each part of FIG. 11. It is a waveform.

In Figures 9 and 11, the same numbers as in Figure 7 are 11 and .

represent the same thing and perform the same action. 31. 48 is a horizontal synchronizing signal input terminal, 32 to 35. 49 to 62 are delay elements such as COD, which delay the input signal by locking.
36, 53 are clock gate signal generators, 42, 59
．． 60 is a switch. In FIG. 9, clock signals 37 to 4o (FIG. 10) and gate signals 41 are created by a horizontal synchronizing signal (FIG. 10, 31) synchronized with the input signal applied to the terminal 31.
If the number of stages is n, then the clock frequency is nfH (fH:
horizontal frequency), the input signal can be delayed by exactly one line. Therefore, CCD32 is set to the period CI
, C3..., frequency n fH, period R1, R3
......, frequency (6/'') nfHp When driven by another period stop clock 37 (Fig. 10), the R - Y signal written in periods C1, C3, ...... During the periods R1, R3..., the CCD 5s is read out at a speed of 6×2, compressed in time axis to 2/6, and obtained at the terminal 43 of the switch 42. Similarly, the CCD 5s is driven by the clock 38. The R-Y signals of periods C2, C4, etc. are compressed to 2/6 in the time axis during periods R2, R4, old, and are obtained at the terminal 44. Also, C0D34.35 is clocked at 39.40. Drive period CI, C3... B
-Y signal during period B1. B3, mountain..., period C2, C4
The B - Y signals of ...... are in periods B, 2, B 4
The time axis is compressed to (215) respectively,
Terminal 46°46 is obtained. Switch these signals to switch 4
2, the gate signal 41 causes the terminals 43 (R1, R3,
・・）.

45 (B1, B3...), 44 (R2, R4
. . .), a compressed color signal as shown in FIG. 8 is obtained at the terminal 28.

During decompression, the demodulated compressed signal obtained at the terminal 47 in FIG. 11 is applied to the C0Ds 49 to 62, and the reproduced horizontal synchronizing signal 48 (FIG. 12) applied to the terminal 48 is applied to the clock signals 64 to 64 created by V. 67 (Fig. 12), and in the complete opposite of compression, the RY signal of periods R2, R4, etc. is driven by the RY signal of periods R1, R3, and so on in periods C2, C4, and so on. is extended on the time axis during periods C1, C3, . -Y signal is obtained. In exactly the same way, a demodulated B--Y signal is obtained at terminal 18.

As described above, the color signal is compressed and recorded as shown in Fig. 8 by using delay elements composed of n stages in the configuration shown in Figs. However, if the number of stages of delay elements is n, the frequency of the clock signal that drives it is "fH*(5/2)nf" in the above example.
The result is H, and there is no degree of freedom. In particular, the frequency (5/
2) The delay element is driven by the nfH clock as shown in FIG.

Clock frequency 2 when compressing by 2 as shown in Figure 6
The clock frequency is higher than n fH, and high-speed delay elements and drivers are required, making it more difficult and increasing power consumption. For example, when using 466 stages of delay elements, the clock frequency in the example of FIGS.
5 f H = 7 * 16 excitation and 2 x 456 f H = 14
．． 3RI&, but in the example of FIGS. 9 to 12, 7.
16 stones and (5/2) x 455fH = 17.9 total,
It becomes difficult to operate and drive the COD.

14 H-2 Purpose of the Invention In view of the above points, the present invention provides a simple structure and a good performance by driving a delay element consisting of n stages driven by a clock signal with a clock signal of any suitable frequency. , the purpose is to compress and expand the time axis of a signal.

Structure of the Invention The present invention uses a delay element composed of n stages driven by a clock signal to set the time t in units of a fixed period T (start point: tb, end point: i) of the signal. When compressing or expanding the signal by a factor of 1 (k) 1: compression, k<1: expansion) starting from time tb after (aT + bT), time t
. Switch the clock frequency at an appropriate point between and tb (
(The clock is stopped during the period bT), so that the delay element is driven with clock signals of arbitrary appropriate frequencies f and kf.

DESCRIPTION OF EMBODIMENTS FIG. 13 shows a 16-ben embodiment of the present invention in the color signal time axis compressor 22 and decompressor 26 in a recording/reproducing apparatus according to FIGS. 7 and 8 to explain the present invention. A block diagram of an embodiment of the time axis compressor according to the present invention, FIG. 14 is a waveform diagram of each part of FIG. 13, and FIG. FIG. In FIGS. 13 and 16, the same numbers as in FIGS. 7, 9, and 11 represent the same things and perform the same operations. 66° 76 is a phase-locked loop (PLL) for generating a continuous signal synchronized with the horizontal synchronization signal, 68
．． 76 is a gate signal generator, and 67.77 is a gate.

In FIG. 13, the PLL 5
6, the continuous fraction 8 of frequency f and the frequency kf (k
:compression ratio (=6/2 in the examples of FIGS. 7 and 8) is generated by the gate signal generator 66 as the gate signal 7.
o is created, and further gate 67 generates clock signal 7
1 to 74 (FIG. 14, 71 to 74) are created. 14th
In FIGS. 71 to 74, the part indicated as f is the frequency f, and the part indicated as kf is the frequency kf. As shown in Figure 14, 1
R-Y, B-Y signal in line (-T) units
(= s/2) times the K pressure m t , the start point of compression of the RY signal in the c1 period by the CCD 32 is tbl, and the end point is t. The start point of the R -Y signal in the R1 period after being compressed by 1° is 'btRy, the end point is 'e1Rt tel to 'b1R
The period up to a T (= (%)H+”=(%))2
Assuming that the time xT after time ``el'' is tel, the clock signal 71 has a frequency of 11 from time te-1R to time t81, and a frequency kf from time t81 to time t.
The continuous waves 68 and 69 are selected by the gate signal 70 and the gate 67 to create the following. When the R-Y signal is input to the CCD 32 driven by this clock signal 71, the signal input to the CCD 32 at time tb1 is changed to the time t8.
The period up to (1+T) is transmitted at the frequency f, and the period after time t81 is transmitted at the frequency kf. Therefore, at the time tb1R, the (1+x)TV+(a-x)Tkf stage COD is transmitted. Now, if the number of COD stages is n, in order to output a signal that has just entered time tb1 by 17 vanes at time tb1R, (1+x)Tf
+(a-x)Tkf=n Therefore, set the period xT so that it becomes. In this way,
The signal written at the frequency f during the period C1 is read out at the frequency kf during the period R1 and is compressed to double. In this way, the RY signal of period c1°C3 . . . is compressed twice and obtained during period R1°R3 . In exactly the same way, the CCD 33 is driven by the clock signal 72, and the period C2
, C4... are compressed to double the period R2,
R4... is obtained at the terminal 44. Further, the start point of compression of the BY signal in the c1 period by the CCD 34 is tbl, and the end point is t. 1. The starting point deviation of the compressed page signal in the B1 period.

b = (215)) from time ts1 to time after bT at t8
'1181, the clock signal 73 changes from time tb1 to time t.
Frequency f2 up to s1, tsI, stop 2 time t, up to s'1, and t from '1 to time t. Frequency kf・up to 1B
It is designed so that... This clock signal 73
When the B-Y signal is input to the CCD 34 driven by
At time tb1B, the signal input at time tb1 is similarly progressing through the (1+x)Tf+(a-x)Tkf stage COD, and if the period xT is set to satisfy equation (1), the period CI, The B-Y signals of C3... are compressed twice as much, and during the period B1... Ba... to terminal 4
6. In exactly the same way, the clock signal 74
When the CD36 is driven, the B-Y signals of periods C2, C4, etc. are compressed to double, and the terminal 4 is output during periods B2, B4, and so on.
6. These signals are sent to terminals 43 (R1, Rs...), 45 (
B1, B3...), 44 (R2, R4...), 4
6 (B2.B4...) and connect the 8th to terminal 28.
A compressed color signal as shown in FIG. 28 is obtained. At 19 beers to the clock signal 71,72, the switching of frequencies kf and f occurs at time t. From 1R to time tb19 time t. From oR to time tb22 time te1
Any time point from R to time point tb3 . . . may be used.

In addition, in the clock signals 73 and 74, the frequency f' and kfs at the point in time are not limited to the periods shown in FIG.
Any timing may be used as long as f: xT, stop: bT, kf: (a-x)T.

Now, T = 1 lie y, a = 115, b = = 2
/6. In the case of n==455°k=5/2, k f
When setting =91Of H=14.3hlh (fH=1: line frequency), f=364fH=6.72 total, and from equation (1), =6O". Also, Tf=364.aTf= 72T.

Since aTkf==182, there are 72 clocks of f and 182 clocks of kf during the period of aT!
T m , time point t. 1tte2... may be determined so that there are 60 clocks for f and 31 clocks for kf, or 61 clocks for f and 30 clocks for kf.

During expansion, the demodulated compressed signal obtained at terminal 47 in FIG.
．． The gate signal generator 76 is driven by clock signals 81 to 84 (FIG. 16, 81 to 84) generated by the gate 77.

In Figs. 16 81 to 84, f indicates the frequency f.

The symbol kf is the frequency kf.0 As shown in FIG. 16, R-Y is compressed by (5/2) times.

The B-Y signal is divided into (215) lines (-t) by k (=2
15) When expanding twice (the value of T is opposite to that during compression), the start point of the expansion of the BY signal in the B1 period by the CCD 52 is tblB, and the end point is ``s1B?'' After expansion, the C1 period The start point of the B-Y signal in is tbl, and the end point is telt.
If the period from telB to tbl is aT2 and the time xT after time ta1B is ts,', then the clock signal 82
is created so that from time tb1B to time tll'1 211<, frequency 19 from time t≦1 to time tb3B is frequency kf... When a compressed color signal is input to the CCD 52 driven by this clock signal 84, the signal that entered the CCD 52 at time 'b1B passes through the (1+x)'rif+(a-x)Tkf stage CCD at time tb1. Then, if the period xT is set to satisfy equation (1) as in the case of compression, B-Y of the period B1゜B3...
The signal is expanded to twice the original signal, and the periods C1, Cs・
...is obtained at the terminal 64 of the switch 60. In exactly the same manner, the CCD 51 is driven with the clock signal 83, and the period B2. The BY signal of B4... is expanded twice and is obtained at the terminal 63 of the switch 6o during periods C2, C4.... Further, the start point of the expansion of the RY signal in the R1 period by the CCD 5o is tb1, and the end point of R5 is t. The starting point of the R, -Y signal in the 01 period after being expanded by 1Rt is y, and the ending point is τy"elB.
bT(=(2/e;)H, b=1L time point t
. The period from 1B to time point ■ is aT, time point t. If the time point from 1R to xT is t81, the clock signal 82 is
From time 22 vane point tb1R to time ts1, frequency 19 time t81
From the stop 2 point ts'1 to the time t8'1
The frequency is kf up to baR.

Compressed C into C0D50 driven by this clock signal 82
When a signal is input, the signal input at time tb1R is traveling through the (1+x)Tf+(a-x)Tkf stage COD at time tb, and if the period xT is set to satisfy equation (1), then , periods R1, R3, .
The RY signals of 2, R4, . These switches 69 and 6O are alternately switched by the gate signal 58, and the demodulated R-Y signal is sent to the terminal 17.
8, a demodulated B-Y signal is obtained. Clock signal 81.
At 82, the switching of frequencies kf and f occurs at time t. 0
From tb2R1 time t. 1 to tbsR... The frequencies f, kf, and stop period at 023, \-7... are the 16th
Not limited to the figure, f: x T, stop: b T,
Any timing may be used as long as k f:(a-x)T. At clocks 83 and 84, the frequencies kf and f may be switched at the same time.

Now, T = (215) line ta = 1 /4 t b
” 1 In the case of tn=455, tn=215, f
= 910 fH = 14.3 total, k f
= 364f H = 5.72 total, and from equation (1), = 91. Also, since Tf=364 and aTf=91, x T = a T 0 Thus, in both cases, as in equation (1), the period x
By setting T, any suitable locking frequency can be used. Also, although both sides of equation (1) are connected by an equation, the actual clock switching is done by the number of clocks as mentioned in the numerical example during compression, so xT
may be determined so that the total number of clocks before and after switching is appropriate. Therefore, instead of equation (1), it will be expressed as follows. The compression/expansion unit T is not limited to one line, but can also be several lines, fields, or frames.

In the above description, the present invention has been described for the case where two pairs of heads compress and record a °Y signal on one head and a chrominance signal on the other, but the present invention can be applied to various other cases as well. For example, with a pair of heads, Y.

When compressing the R-Y and B-Y signals and recording them by time-axis multiplexing, at this time, the color signals are recorded line-sequentially (R-Y
, B-Y signals are recorded alternately), and two pairs of heads are used to expand the Y signal and compress and multiplex the color signal to create two sets of multiplexed signals ( In this case as well, the color signals may be made line-sequential). Various applications can be considered.

Further, in the above description, a case has been described in which compression/expansion is performed using COD, but the present invention is also effective in cases where a signal is digitized and digitally delayed.

The present invention can be used not only for recording and reproducing video signals, but also for recording, transmitting, and converting all kinds of signals.

Effects of the Invention As described above, the present invention provides a compact device for obtaining high-quality reproduced video signals, audio signals, etc., and a time axis conversion device for other signals, using ordinary elements with a simple configuration. be able to.

[Brief explanation of drawings]

Figure 1 is a diagram showing the recording pattern of a conventional VTR;
The figure is a plan view showing the head arrangement of a video signal recording and reproducing device used in one embodiment of the present invention, FIG. 3 is a front view of the same main part, and FIG. 4 is an example of a recording pattern by the head. 5 is a block diagram of a conventional recording method using the head, FIG. 6 is a diagram showing main waveforms of FIG. 6, and FIG. 7 is an implementation of a recording/reproducing apparatus using the present invention. Figure 8 shows an example of the lock diagram.
Figures 11 and 11 are block diagrams of the main parts of the conventional example in Figure 7, Figures 10 and 12 are waveform diagrams of each part in Figures 9 and 11, and Figures 13 and 16 are FIG. 7 is a block diagram of an embodiment of the present invention, and FIGS. 14 and 16 are waveform diagrams of each part of FIGS. 13 and 16. 22... Time axis compressor, 26... Time axis expander, 32-35. 49-52... CCD
, 6s, 75...PLL, 66.76...
...Gate signal generator, 67.77...Gate, 71-7j, 8.1-84...Clock signal. Name of agent: Patent attorney Toshio Nakao and 1 other person 8
Figure 9

Claims (1)

[Claims] (1) Using a delay element composed of n stages driven by a clock signal, a certain period T of the signal (starting point: 'tb,
End point: End point: After (aT + bT) from the time point 1° at the rate (
The starting point is time tb (including b-〇), and time t is T/ after time tb. Compress or expand the time axis of the signal by two times so that the end point is (k>1: compression, k<1: expansion)
In doing so, from the start point tb of the period T to the end point t. and time t. During the period xT of the period from to to tb''l, the delay element is driven with a clock signal of frequency f, and the clock is stopped during the bT period from to to tb,
t. The remaining (a − x ) from to tb, T period and from tb to t. The delay element is driven by a clock signal of frequency kf during the period n-(1+ka)T.
Period so that f x Tf = □ 1- to 2 b-. A time axis compression/expansion device characterized in that T is set.