JPS6066591A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To remove color noise of reproduced picture and obtain a reproduced picture of high quality by providing a switch changed and connected according to respective mode so that output of an automatic frequency control AFC circuit of a recording system circuit is supplied to respective automatic phase control APC circuit of the recording system circuit and a reproducing system circuit when the device is in the mode other than reproducing mode. CONSTITUTION:At the time of reproducing mode, the movable contact piece of a switch S3 of a reproducing circuit 6 is connected to a terminal (b). On the other hand, input of an automatic color signal control ACC circuit 10 is changed so that reproduction output signal from the video head of a record reproducing section, not output of a recording system circuit 3, is supplied. On the other hand, at the time of recording mode, the movable contact piece of the switch S3 of the reproducing system circuit 6 is connected to a terminal (a) and output of a record signal processing circuit 19 of the recording system circuit 3 is changed to be supplied to the video head of the record reproducing section. Thus, even when there is divergence between output oscillation frequency of the AFC circuit 7 and output oscillation frequency of the AFC circuit 8, frequency of predetermined accurate value can be obtained without influenced by the divergence.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing device u, which has a recording system circuit and a reproducing system circuit, respectively, and these two circuits are connected to each other.
A with an APC (automatic phase control) circuit and an optical oscillator installed.
This invention relates to a magnetic recording/reproducing device equipped with an FC (automatic frequency control) circuit.

Conventional technology For example, in a commercial VTR, the recording circuit and the reproduction circuit are separated into one Vll. tlJ 11. 'l
The configuration is such that these two circuits can be switched in a timely manner to allow editing from IIT to inserter 1 without noise at the joint.

In VTRs that have not been manufactured, the inner recording B! It takes 114 seconds for the signal to be supplied to the video head via the circuit that is in the recording mode from the time of switching to the time it is recorded on the magnetic tape, and it is possible to record from the inserter 1 to the recording mode without any noise during connection. I'm in trouble
``This J, in order to eliminate the inconvenience,
-r R has a recording system circuit and a reproduction system circuit (J,
The recording system circuit is always connected through No. 8, and a recording signal is supplied to the video head at the same time as the recording operation to the inserter 1, and editing is performed to the inserter 1 without noise at the joint 41.

By the way, in order to confirm whether the recording system circuit and the reproduction system circuit are operating normally without any abnormality, it is necessary to monitor the recording system circuit and the reproduction system circuit using a color bar signal. What is done is done.

That is, as shown in the negative '51 diagram υ', the interlocking switch S+.

Connect S2 to terminal C (till and record unit 1 for video head, magnetic tape, etc.) f: S3 /J'l
lij fed 41. ', t L), L, and then input the signal to the terminal 2 of the recording system circuit 3. Switch S+, S2. i'! Take out via cow system circuit/l-C
Then, from this reproduced image ITi, it is determined whether there is an abnormality or not.

By the way, the recording system circuit 3 and the reproduction system circuit 1 have people Δ1
:C circuit is installed (), but recording system circuit 3 and reproduction system circuit 'I (r' 11i111
．． "When moving 1'1 to 1, the 8F C of recording system circuit 3
If there is a difference between the output optical frequency of the oscillator installed in the 1Ω (〕64) circuit and the output optical frequency of the oscillator installed in the 4FC circuit, /\IC
Output of the circuit (・Frequency conversion η- when predetermined il,: (jV It is difficult to obtain a high-quality reproduced image, such as when the image is blown (horizontally) or when it appears (horizontally).

The first stage of the present invention for solving the problem Ji'it is a recording system circuit A l:) C circuit and t, 4
between the AFC circuit of the system circuit and the reproduction system circuit, or (
Between the ΔPC circuit of the reproduction system circuit and the AI:C circuit of each of the reproduction system circuit and recording system circuit, when the device is in the reproduction mode,
The output of the AFC circuit of the recording system circuit is ΔP C of the recording system circuit.
circuit, and the output of the AFC circuit of the reproduction system circuit is the above I.
The output of the FC circuit to the recording system circuit] is supplied to the 130 circuit of the IJ generation circuit, the mode other than the playback mode of the device, the output of the FC circuit to the recording system circuit and the FJ generation circuit. or the output of the A I:C circuit of the playback system circuit is supplied to each of the APC circuits of the playback system circuit and the recording system circuit. 47. As a result, the above-mentioned problems have been solved, and one embodiment thereof will be described above with reference to FIG.

Embodiment FIG. 2 shows a block system diagram of an embodiment of the magnetic recording/reproducing apparatus according to the present invention. In the figure, the same numeral 4111 as in FIG. In the figure, reference numeral 6 denotes a reproduction system circuit, which is provided with a switch S3.

Terminal a of switch S3 is iiL! ! ,? System episode h□rs
:+ The output of the A I C1111 path 7, its child is the output of the Δ1G circuit 8 of the circuit 6, its i movement 1 &I'd' i. 'l k'8
(i's △l) C circuit 9 entry] was compared to people ((13
1, 1'I am playing mode UI: -
(Return 1. &,) L-do <t-; stop mode,
In the recording mode, 7) 1) and 1'a are respectively configured to be switched and connected to 1'a.

Reproduction mode 114, the co-moving contact of switch S3 to the system circuit is connected to terminal 1), Δ00 (office color signal control) circuit 10 human power iJ 1111 'it
In the series, the 71st copy of the record shown in the first diagram is not the output of '63'
■Raw output from 1's Bi'Al\ts (i:j 3"
j is supplied to J,').

J stiff on this, +i2 of record 1 student part 1! l kl
The signal sent to the low frequency conversion UI2 of lt is the Δcc00 circuit 11.
1C (supplied to the frequency conversion circuit 11, where (Δ1)C
The output of the 4.21 MH7 of the circuit 9 is frequency converted (the carrier color is No. 16 of the 3.58 MH7, and the output is '1'1.
'The IJ processing circuit 12 processes the output terminal +'
13 J, S11] is served. -force, frequency conversion
The output f of L1 path 1' (L h is supplied to the Seahurst signal handling circuit 14, where the color hearth signal is removed, and the digit (1) of the APC circuit 9 is fixed to the comparator 15 with J3. The phase is compared with the 3.58 MHz output signal from the frequency oscillator 1G and the phase ratio axis error signal is sent to the VXO.
<Voltage controlled crystal oscillator) Controls the output horn oscillation frequency of 17.

The output of VXOI 7 is supplied to the frequency conversion circuit 18, where it is frequency converted to the low frequency conversion carrier color IhaO of (i29 kl-I Z) from the A10 circuit 8.
．． 211vl l-1z signal and is supplied to the frequency conversion circuit 11.

10,000, recording t-do Ik), switch S3 of the reproduction system circuit 6
The movable piece is connected to the terminal a, and the output j of the recording signal processing circuit 19 of the recording system circuit 3 is switched so as to be supplied to the video head of the recording and reproducing section 1 shown in the first diagram.

As a result, the color signal < 3.58 MHz) input from the outside to enter the terminal 2 is transferred to the ACC circuit 2.
0 to the frequency conversion circuit 21, where △l
The frequency is converted by the 4.21MH2 output of the DC circuit 22 and the 11°C I change +1Vj I of the 629 old 17
It is used as the idle j entrance signal and sent to the recording signal processing circuit 19 (f, ,
i'J processing and is supplied to the video head of the recording/reproducing section 1 shown in the first diagram. -The output of the ACC circuit 20 is fed to the Cuckherst No. 2 extraction circuit 23 (the signal is extracted here to the Color Hearth 1, AI) C circuit 22
In the phase comparator 24 of 1), the VXO 25 is 3.58
The output signals of M l-l Z are compared in phase (' je
It is used as a t-phase comparison error signal, and the output oscillation frequency of VXO25 is 8.
Controls 9 degrees. The output of VXO25 is the frequency conversion circuit 2
G2 of the FC circuit 7! ] kll
It is frequency-converted by the A1 input range conversion carrier color signal of i (4, 21 M l-I Z's A2) and is supplied to the 1711 wave number variable 1 Shiba circuit 21.

Here, 'J' of recording system circuit 3 and re-1-system circuit 0 is
When determining the presence or absence of '7+j, connect the movable contact of switch f-83 of the reproduction system circuit 6 to terminal a, and then ,7. Output 4 of recording signal processing circuit 19 of system 1"I Wii, 1
Supplied to the input terminal of the ACC circuit 10 of the beef cattle system λ'86, J,) is replaced with Q, and ☆ is supplied with the color par signal to child 2.

In addition, the color par signal is processed in the recording system circuit 3 in the same manner as in the above-mentioned recording-1~, and is supplied to the reproduction system circuit 6, where it is processed in the above-mentioned reproduction-1-. The signal is processed as in the case and taken out from the output terminal 13,
Negative] 1 is generated on the monitor receiver 5 shown in the figure. The supervisor looks at the playback screen of 5 and confirms that the recording system circuit 3 and the playback system circuit 6 are working properly.
“J-ru.

In this case, J31) is added to the △PC circuit 9 of the recycled yarn turn i'8G.
Frequency 19. The variable circuit 18 is supplied not with the output of the ΔFC circuit 8 but with the output of the eight FC circuit 7 of the recording system circuit 3 (
Perform frequency conversion (that is, ΔP C of recording system circuit 3
The frequency conversion circuit 26 connected to the circuit 22 is also connected to the reproduction system circuit 6.
AI) The frequency conversion circuit 18 in the C circuit 9 is also supplied with the output of the circuit 7 to perform frequency conversion. As a result, the output oscillation frequency of the AFC circuit 7 and △1
: The output oscillation frequency of the C circuit 8 is shifted, and C:b is predetermined without any influence. You can get the image.

Modification In the above embodiment, A10 of "[seed 11,), output! Yarn times recorded in the frequency conversion circuit 18 of the I-thread circuit 6]"
The output of the circuit 7 (Jj is supplied (111 output 311), but the switch 51 (a setting (ノ, I-1 sea 1~++, 7, the frequency conversion circuit of the recording system circuit 3) The output of the AFC circuit 8 of the reno 1 system circuit 6 is supplied to the 2G.

Effects As mentioned above, the present invention has 4. -Magnetiki 111 Series Mountain Il
SR'i is the A20 circuit of the recording system circuit, :12'
j1: between the AIC circuit of people in the ``3 and O mountain line circuits in the yarn turn, or the A20 circuit of the mountain ``1 yarn circuit and the regenerated yarn turn>'8
r/, Q. Note 11 (Thread circuits (no), between each of the 8 FC circuits, there is a mountain '1.' L -1~II°1 at 4 mm intervals,
The output of the FC circuit of the recording system circuit or the PC circuit of the recording system circuit, and the output of the AIC circuit 1 of the recording system circuit are supplied to the ΔPC circuit of the reproduction system circuit. 1. The output of the AFC circuit of the recording thread circuit is the output of the recording system 11 and the output of the recording thread circuit. l) A switch that is switched and connected according to each mode so that it is supplied to the circuit C, or to the output of the A10 circuit of the reproduction system circuit, or to the circuits △1) of the reproduction system circuit and the recording system circuit. Because of the installation (), in 1'■, write ↑, A: System circuit and reproduction system circuit
) Activate at 1 o'clock Even if there is a deviation in the oscillation frequency of the AFC circuit's oscillator, the effect is determined in advance (
It is possible to get the frequency of 7 values by 1, this is i
It is important to obtain high-quality images without adding color noise (color horizontal stripping) to the screen.

[Brief explanation of drawings]

FIG. 1 is a schematic block system NJt diagram for explaining how to use a general device, and FIG. 2 is a block system Je diagram of an embodiment of the device of the present invention. 2... Human power 9111 child, 3... Recording system circuit, 6...
Reproduction circuit, 7. ε5-・△1-C circuit, 9,22・
・・APC circuit, 11.18, 21.26 medium frequency ☆j
Switching area a, 13...output end F, 83...switch.

Claims (1)

[Claims] It has a recording system circuit and an O-reproduction system circuit, and these two circuits are provided with a frequency conversion circuit to control the phase of the input signal and convert the input signal to the output of the frequency conversion circuit. APC (automatic frequency control) circuit for frequency conversion,
and an oscillator is installed in each of them, and the output is
In a magnetic recording and reproducing device equipped with an AFC (automatic frequency control) circuit that supplies the frequency conversion circuit of the C circuit,
2. Between the ADC circuit of the recording system and each of the AFC circuits of the recording system circuit and the reproduction system circuit, or between the △PC circuit of the reproduction system circuit and the people of the reproduction system circuit and the recording system circuit. When the AFC circuit of the device is in playback mode, -
The output of the 8FC circuit of the 12 recording system circuit is supplied to the APC circuit of the recording system circuit, and the output of the AF C circuit of the reproduction system circuit is largely supplied to the ΔPC circuit of the reproduction system circuit. So, in a mode other than the playback mode of the device, the output of the △l-C circuit of the recording system circuit is transferred to the △l)C circuit of the recording system circuit and the playback system circuit, or In order to supply the output of the 80 circuit of the system circuit to the △1]0 circuit of the above-mentioned reproduction system circuit and recording system circuit, a switch is installed that is switched and connected according to the power of the people. 1. A magnetic recording and reproducing device that uses a Q!r flip.