JPH04258948A - Magnetic recorded data reproducing device - Google Patents

Abstract

PURPOSE:To prevent S/N ratio from being lowered and to obtain a reliable reproducing signal by changing the time constant of a filter according to the photographing mode of a camera. CONSTITUTION:In the magnetic recorded data reproducing device for reproducing information recorded on the magnetic recording part of a film, the voltage value of a battery 3 is detected by an A/D converter 4 and the state of a single photographing/consecutive photographing mode change-over switch 18 is detected. Based on the detected values, the time constant by the combination of the resistance and the capacitance of the filter in a reproducing circuit 19 which amplifies the output of a reproducing head 6 is switched to the time constant for high speed or low speed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetically recorded data reproducing apparatus used in a camera using film having a magnetic recording section.

0002

2. Description of the Related Art Conventionally, there is a method for reading camera film information by electrically reading a CAS code from a cartridge and inputting information such as film sensitivity and the number of shots that can be taken.

Furthermore, as shown in US Pat. No. 4,864,332, a transparent magnetic film is provided on a film to form a magnetic recording section, and information is transmitted to the magnetic recording section by a magnetic head and a magnetic recording data reproducing device provided on the camera side. A method for magnetically recording information (film information, shooting information, etc.) has been proposed.

0004

However, in the above-mentioned conventional magnetic recording, reproduction is performed by constant speed feed of a data recorder or the like. However, when trying to play back the magnetic recording according to the camera's film feed, the film condition (for example, the spool diameter and winding condition change depending on the film frame, so the film pull-out load, etc.) changes, and the camera condition (for example, (for example, changing the feed gear system from that in single shooting mode to wind the film faster in continuous shooting mode), the change in film feeding speed is very large, so the frequency and amplitude of the playback signal may change. will also change accordingly. This is the S of the playback device.
This caused a decrease in the /N ratio (signal-to-noise ratio), and the reproduced signal had low reliability.

[0005] The object of the present invention has been made in view of the above-described actual state of the prior art, and is to provide a magnetic recording data reproducing device that can prevent a decrease in the S/N ratio and obtain a highly reliable reproduced signal. Our goal is to provide the following.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetically recorded data reproducing apparatus for reproducing information recorded on a magnetic recording section of a film, in which a noise component in a reproduced signal is suppressed. A filter whose time constant can be switched at the same time as removal, mode setting means for setting a plurality of photographing modes, and control means for switching the time constant of the filter according to setting data of the mode setting means are provided.

[0007]

[Operation] According to the above-mentioned means, the film feeding speed changes greatly depending on the film condition, etc., but in order to predict the feeding speed, the content of shooting modes such as single shooting/continuous shooting mode, quiet/normal mode, etc. A low-speed filter or a high-speed filter is formed by switching the time constant of a filter provided in the reproduction signal system by the control means accordingly. Therefore, the S/N ratio can be increased and magnetic reproduction can be performed with high reliability.

[0008]

[Embodiment] FIG. 1 is a circuit diagram showing a schematic configuration of a first embodiment of a magnetically recorded data reproducing apparatus according to the present invention (here, the case is assumed to be applied to a camera using film equipped with a magnetic recording section). It is a block diagram.

Reference numeral 1 denotes a CPU (central processing unit) that performs overall control, and the following components are connected to it. 2 is a switch connected to the CPU 1 to start the photographing operation, and 3 is a battery (V
BAT), 4 is an A/D converter for converting the analog voltage value of the battery 3 into a digital value and sending it to the CPU 1;
5 is an automation circuit consisting of an AE (auto exposure) circuit, an AF (auto focus) circuit, and an SH (shutter) circuit for performing photometry, distance measurement, and photographing operations; 6 is a playback head that detects magnetically recorded data as a signal; 7 is an automation circuit A reproducing circuit 8 amplifies the signal detected by the reproducing head 6, and 8 converts the magnetic recording signal amplified by the reproducing circuit 7 into a digital signal and sends it to the CPU.
A comparator 9 sends the film to the film feeder 1, and a feeding circuit 9 is constructed using a bridge circuit to drive a motor M for feeding the film. Further, 10 is a photocoupler that generates pulses by repeating brightness and darkness by a pulse plate that rotates following the feeding circuit 9.

FIG. 2 is a circuit diagram showing details of the reproducing head 6 and reproducing circuit 7. As shown in FIG.

Each of 11, 12, and 13 is a reproducing head 6.
This is an amplifier that amplifies the reproduced signal of the magnetically recorded data output from the amplifier, and is connected in series in three stages. Among these, the amplifiers 11 and 12 may be, for example, TL592 manufactured by Texas Instruments, and the amplifier 13 may be TL071. 14 is a filter circuit for cutting noise etc. of the reproduced signal amplified by the amplifier 11; 15a, 15b, 15c, and 15d are filter circuits 14;
time constant (resistors R1, R2 and capacitors C1, C
2 and a combination of resistors R1', R2' and capacitors C1', C2'), 16 and 17 are amplifier 1
This is an amplification adjustment resistor that is connected between each input and output of No. 1 and No. 12 and determines the amplification degree. Resistors R1 and R2 are connected in series and connected to one output terminal of amplifier 11, and similarly resistors R2' and R1' are connected in series and connected to the other output terminal of amplifier 11. Resistance R2 and resistance R
Analog switches 15c and 15 are connected in parallel to each of 2'.
d are connected in parallel. In addition, a capacitor C1 is connected between the output side of the resistor R1 and the ground, and a resistor R1 is connected between the output side of the resistor R1 and the ground.
A capacitor C1' is connected between the output side of C1' and ground. A series-connected analog switch 15a and a capacitor C2 are connected in parallel to the capacitor C1, and a series-connected analog switch 15b and a capacitor C2' are connected in parallel to the capacitor C1'.

FIG. 3 is a flowchart showing a series of operations of the embodiment shown in FIGS. 1 and 2. Note that S in the figure represents a step.

First, check the status of switch 2 (S3
01) Then, when the switch 2 is turned on, the voltage of the battery 3 is converted into digital data by the A/D converter 4, and the data is stored in the CPU 1 (S302). Next, the digital data is compared with the camera driveable minimum voltage data Vmin preset in the CPU 1 (S303), and if the digital data is less than the data Vmin, the operation is terminated. If the value is equal to or higher than Vmin, the process moves to a photographing operation (S304). In this photographic operation, the automation circuit 5 is used to perform well-known photometry and distance measurement, and photographing is performed based on the data. Thereafter, the film is fed (S305), and the series of operations ends. The magnetically recorded data is detected as a signal by the reproducing head 6 during the film feeding operation in S305, amplified by the reproducing circuit 7, converted into a digital signal by the comparator 8, and then taken into the CPU 1.

FIG. 4 is a flowchart showing details of the film feeding operation in step 305 shown in FIG.

After the photographing operation (processing result of step 304) is completed, the residual voltage digital data of the battery 3 (processing result of step 302) is compared with a preset filter time constant switching point voltage V1 (S401),
If the digital data is smaller than V1, the filter signal sent from the CPU 1 to the analog switches 15a, 15b is set to "H" level and the analog switches 15a, 15b are set to "H" level.
Turn on and turn off analog switches 15c and 15d.
By doing so, a low-speed filter with a low time constant is set (S402). Also, the digital data is V1
In the above case, from the CPU 1 to the analog switch 15a,
Set the filter signal sent to 15b to "L", turn off analog switches 15a and 15b, and turn off analog switch 1.
By turning on 5c and 15d, a high-speed filter with a high time constant is set (S403). Step 4
After setting the filter by 02 or 403, the counter inside the CPU 1 that counts the pulses generated by the photocoupler 10 is reset (S404), the feeding circuit 9 is started (S405), and the pulses that rotate following the feeding motor are reset. The plate starts counting pulses generated from the photocoupler 10 (S406). Detects whether a pulse is sent from the photocoupler 10 to the CPU 1 (S410
), if a pulse is sent, the pulse count is increased (S407); if a pulse is not sent, the magnetic recording data on the film is detected and amplified by the playback head 6 and the playback circuit 7, and the comparator 8 converts the data into digital data. It is converted into a signal and taken into the CPU 1 (S411), and the process returns to the pulse detection process (S410) again. After the pulse count process (S407), it is determined whether the pulse count number is greater than or equal to the preset feeding stop count number C1 (S408), and if the pulse count number is less than C1, the pulse count process is performed again. Returning to (S407), when the pulse count exceeds C1, the feeding circuit 9 is stopped (S409), and the series of feeding operations ends.

As explained above, since the filter is switched between high speed and low speed in stages depending on the remaining voltage of the battery 3, it corresponds to the magnetic recording data reproduction frequency that follows the film feeding speed, and eliminates unnecessary filter bands. By reducing the amount, the influence of noise and the like can be reduced, and the ability to reproduce magnetically recorded data can be improved.

In the above embodiment, the filter switching point is only one point, but in reality, by having a plurality of switching points, it is possible to further improve the magnetic recording data reproducing ability.

In the above embodiment, the filter time constant was switched only in response to changes in the feeding speed due to the remaining voltage of the battery 3. However, depending on the camera, the filter time constant may be changed even if the remaining voltage of the battery 3 is the same. The feeding speed may differ depending on the mode you are using. For example, when switching between single shooting mode and continuous shooting mode, continuous shooting involves switching the gears in the feeding system to increase the feeding speed, and completing the feeding in a shorter time than during single shooting. There are things. An example compatible with such a camera is shown below.

FIG. 5 is a circuit block diagram showing a schematic configuration of a second embodiment of the magnetic recording data reproducing apparatus according to the present invention. Note that in this embodiment, the same reference numerals are used for the same parts as in the embodiment of FIG.

This embodiment is characterized in that, in addition to the configuration shown in FIG. 1, a single-shot/continuous-shot mode changeover switch 18 is provided. In addition, in this embodiment, the signal transmitted from the CPU 1 to the reproducing circuit 19 is a filter signal 1 (Filter signal 1).
There are two types: filter signal ter-1) and filter signal 2 (Filter-2).

FIG. 6 is a circuit diagram showing details of the reproduction circuit 19 shown in FIG. 5.

This configuration is basically the same as the circuit shown in FIG. 2, but the analog switch 1 inside the filter circuit 20
5a and 15b are connected to the filter signal 1 of the CPU 1,
The analog switches 15c and 15d differ in the configuration in which they are connected to the filter signal 2 of the CPU 1.

FIG. 7 is a flowchart showing the operation of the configurations shown in FIGS. 5 and 6.

First, the state of the single shooting/continuous shooting mode changeover switch 18 is checked, and whether the mode is single shooting or continuous shooting is stored as data in the CPU 1 (S701). Next, the state of switch 2 is checked (S702), and when switch 2 is turned on, the voltage of battery 3 is converted to digital data by A/D converter 4, and the data is converted to
It is stored in PU1 (S703). Next, the digital data is compared with the minimum voltage data Vmin that can drive the camera, which is preset in the CPU 1 (S704),
If the digital data is less than Vmin, the operation ends. In addition, if the value is higher than Vmin, the photo shooting operation (S70
Move on to 5). In this photographic operation, the automated circuit 5
, perform well-known photometry and distance measurement, and take pictures based on that data. After that, the film is fed (S7
06), the series of operations ends. Magnetic recording data is S
During the film feeding operation of step 706, the signal is detected by the reproducing head 6, amplified by the reproducing circuit 19, converted into a digital signal by the comparator 8, and then taken into the CPU 1.

FIG. 8 is a flowchart showing details of the feeding operation of FIG.

First, the single shooting/continuous shooting mode data (determination result of step 701) is determined (S801), and then the remaining voltage digital data of the battery 3 (processing result of step 703) and the filter time constant switching point V1 are determined. Compare (S802 and S803). Digital data is less than V1 in single shooting mode (A/D Data<V1)
In this case, filter signal 1 is set to "H" level, filter signal 2 is set to "L" level, and the single-shot low-speed filter is set (S804). Further, when the digital data is V1 or more (A/D Data>V1) in the single-shot mode, both the filter signal 1 and the filter signal 2 are set to "L" level, and the single-shot high-speed filter is set (S805).

On the other hand, in the continuous shooting mode, the digital data
1 (A/D Data<V1), filter signal 1 is set to "H" level, and filter signal 2 is set to "H" level.
level and set the continuous shooting low speed filter (S806)
do. If the digital data is equal to or higher than V1 in the continuous shooting mode, the filter signal 1 is set to "L" level and the filter signal 2 is set to "H" level to set the continuous shooting high speed filter (S807). After the filter set processing in any of steps 804 to 807, the photocoupler 10
The counter inside the CPU 1 that counts the pulses generated in is reset (S808) and the feeding circuit 9 is started (
S809), the pulse plate that rotates following the feeding motor starts counting pulses generated from the photocoupler 10 (S810). Photocoupler 10 to CPU
It is detected whether or not a pulse is sent to 1 (S814), and if a pulse is sent, the pulse count is increased (S8
11) If a pulse is not sent, the magnetically recorded data on the film is detected and amplified by the playback head 6 and playback circuit 19, converted into a digital signal by the comparator 8, and taken into the CPU 1 (S815), and the pulse detection process is performed again. Return to (S814). Pulse count processing (S
811), it is determined whether the pulse count number is greater than or equal to the preset feeding stop count number C1 (S812), and if the pulse count number is less than C1, the pulse count process is performed again (S813). Return and when the pulse count exceeds C1, stop the feeding circuit 9 (S
814), the series of feeding operations ends.

As explained above, in addition to switching the filter time constant depending on the remaining voltage of the battery 3, by switching the filter time constant depending on the shooting mode, magnetically recorded data can be reproduced even in a camera whose feeding speed changes depending on the shooting mode. You can improve your abilities.

It is also effective to change the time constant of the filter even when the feeding speed is slow, such as in modes other than continuous shooting and single shooting modes, such as quiet mode. In this case, as shown in FIG. 17, a [quiet mode/normal mode check] process (S1701) is provided in place of step 701 in FIG. 7, and a [quiet mode/normal mode check] process (S1801) as shown in FIG. may be provided in place of step 801 in FIG.

In addition, in the above embodiment, switching of the shooting mode was cited as a factor that changes the feeding speed other than the remaining voltage of the battery 3, but the feeding speed also changes depending on the number of frames of film fed and the temperature. do. FIGS. 9 and 10 are graphs showing changes in feeding speed corresponding to changes in each condition. An example corresponding to such a case will be described below.

FIG. 11 is a block diagram showing a third embodiment of a magnetically recorded data reproducing apparatus according to the present invention.

In this embodiment, the same reference numerals are given to the same members as in each of the above-mentioned embodiments, so redundant explanation will be omitted here, and only the added parts will be explained. 2
1 is a temperature detection circuit that uses a thermistor to change the voltage depending on the temperature and sends the voltage as digital data to the CPU 1, and 22 is a film counter that records the number of film frames, both of which are connected to the CPU 1. The detailed circuit configuration of the reproduction circuit 19 shown in FIG. 11 of this embodiment is shown in FIG. 6, and is the same as that of the previous embodiment, so a description thereof will be omitted.

FIG. 12 is a flowchart showing the operation of the configuration shown in FIG.

First, the state of the film counter 22 is checked (S1201) and stored in the CPU 1. Next, after determining whether the switch 2 is ON (S1202), A/D conversion of the remaining voltage of the battery 3 and data storage (S12) are performed.
03) and compare it with the minimum camera driveable voltage data Vmin set in advance in the CPU 1 (S120
4), and if the temperature is higher than Vmin, the temperature data is sent from the temperature detection circuit 21 to the CPU 1 (S1205), then a photographing operation is performed (S1206), and the film is fed (
After performing step S1207), the film counter 22 is counted up (step S1208), and the series of operations ends.

FIG. 13 is a flowchart showing details of the processing in step 1207 (film feeding operation).

After the photographing operation (S1206) is completed, the temperature data Temp (processing result of S1205) is compared with the preset filter time constant switching point data T1 (S1301), and the film counter data (
Compare the processing result of S1201) with preset filter time constant switching point data FC1 (S1302,
1303), and when (temperature data Temp<T1) and (film counter data>FC1) are established, filter signal 1 is set to "H" level and filter signal 2 is set to "H" level.
to “L” level and set the low-temperature, low-speed filter (S
1304). Also, (temperature data Temp<T1
) and (film counter data≦FC1), the filter signal 1 is set to "L" level and the filter signal 2 is set to "L" level to set the low temperature and high speed filter (S1305). Furthermore, (temperature data Tem
p≧T1) and (film counter data>FC1)
In this case, filter signal 1 and filter signal 2 are set to “H”.
level and set the high temperature and low speed filter (A1306
), (temperature data Temp≧T1) and (film counter data≦FC1), filter signal 1 is set to “L”.
" level and also sets the filter signal 2 to "H" level to set the high temperature and high speed filter (S1307). After the filter setting process in any of steps 1304 to 1307, pulses generated by the photocoupler 10 are counted. Reset the counter inside CPU1 (S1
308), the feeding circuit 9 is started (S1309), and the pulse plate rotating following the feeding motor starts counting the pulses generated from the photocoupler 10 (S1
310). It detects whether or not a pulse is sent from the photocoupler 10 to the CPU 1 (S1314), and if a pulse is sent, the pulse count is increased (S1311), and if a pulse is not sent, the magnetic recording data on the film is read. , detected and amplified by the playback head 6 and the playback circuit 19, converted into a digital signal by the comparator 8, and converted into a CP.
It is taken into U1 (S1315) and returns to the pulse detection process (S1314) again. Pulse count processing (S131
1) After that, it is determined whether the pulse count number is greater than or equal to the preset feeding stop count number C1 (S1312), and if the pulse count number is less than C1, the pulse count process is performed again (S1313). Return and when the pulse count exceeds C1, stop the feeding circuit 9 (S
1314), the series of feeding operations ends.

As explained above, the ability to reproduce magnetically recorded data can be improved by switching the filter time constant in response to the feeding speed which changes depending on the number of film frames and the environmental temperature.

In the above embodiment, the filter time constant of the regeneration circuit was switched using an analog switch. However, in order to further improve the regeneration ability and subdivide the filter time constant switching points, it is necessary to increase the number of analog switches and Since an increase in the number of control signals is required, this results in an increase in costs.

An example of subdividing the filter time constant switching points without increasing the control signal will be shown below.

FIG. 14 is a block diagram showing a fourth embodiment of a magnetically recorded data reproducing apparatus according to the present invention.

In this embodiment as well, the same reference numerals are used for the same parts as in each of the above embodiments, so redundant explanation will be omitted here, and only the changed or added parts will be explained. This embodiment is basically the same as the configuration shown in FIGS. 5 and 9, but the CPU 1 contains data on the remaining voltage of the battery 3, which is a factor for changing the feeding speed, data on the single-shot/continuous-shot mode changeover switch 18, and temperature detection. The CPU creates a digital data table for selecting and outputting digital data based on the output data of the circuit 21 and the data of the film counter 22.
1, and further includes a D/A converter 23 that converts digital data output from a digital data table into analog data and outputs it to a reproduction circuit 24.

FIG. 15 is a circuit diagram showing details of the reproduction circuit 24 of FIG. 14.

Although it is basically the same as FIG. 2, it has a distinctive feature in the configuration of the filter. That is, the filter circuit 25 is
Light emitting diode LE connected to D/A converter 23
The circuit includes cadmium sulfide cells Cds, Cds', and variable capacitance diodes Di, Di', which are inserted into the output lines of the LEDs D, LED', and the amplification adjustment resistor 16, respectively, and form a pair with the light emitting diodes LED, LED'. There is.

[0044] In this configuration, the brightness of the LEDs and LED' changes according to the input voltage from the D/A converter 23,
The resistance values of the cadmium sulfide cells Cds and Cds' and the capacitances of the variable capacitance diodes Di and Di' are determined. In the figure, RB and RB' are bias resistors, which are inserted between the variable capacitance diodes Di and Di' and the output of the D/A converter 23.

FIG. 16 is a flowchart showing the operation of the circuits of FIGS. 14 and 15.

After turning on the switch 2 (S1601), the state of the single shooting/continuous shooting mode changeover switch 18 is checked and stored as data in the CPU 1 (S1602). Next, the state of the film counter 22 is checked and its contents are stored as data in the CPU 1 (S1603). Next, the remaining voltage of the battery 3 is converted into digital data by the A/D converter 4, stored as data in the CPU 1 (S1604), and compared with the preset minimum voltage data Vmin that allows the camera to be driven (S1605).
), and if the battery 3 residual voltage data (processing result of S1604) is less than Vmin, the operation is terminated, and if it is more than Vmin, the temperature data from the temperature detection circuit 21 is sent to the CPU 1.
(S1606). Next, each of the single shooting/continuous shooting mode data (processing result of S1602), film counter data (processing result of step 1603), battery 3 data (processing result of step 1604), and temperature data (processing result of step 1606) is Calculate based on data, CPU
1 selects/outputs the corresponding data from the digital data table (S1607), converts it into a voltage with the D/A converter 23, and sends it to the filter circuit 25 of the regeneration circuit 24.
(S1608). For example, in conditions where the film feeding speed becomes faster in continuous shooting mode, with new batteries, at room temperature, etc., by selecting/outputting data in the CPU 1 that increases the output voltage of the D/A converter 23, the light emitting diode LED , the brightness of the LED' increases, and the resistance value of the cadmium sulfide cells Cds and Cds' decreases. Further, the capacitance of the variable capacitance diodes Di and Di' also decreases. This increases the time constant of the filter circuit 25, making it possible to reproduce high frequency bands. Similarly, under conditions where the film feeding speed is slow, by selecting/outputting data from the CPU 1 that lowers the output voltage of the D/A converter 23, the resistance values of the cadmium sulfide cells Cds and Cds' are large, and the variable capacitance diode Di , Di' increases, so the time constant of the filter circuit 25 decreases,
Since only low frequency bands can be reproduced, the effects of high frequency noise etc. can be reduced. That is, the voltage applied to the filter circuit 25 changes based on the data of the feeding speed change factors, the resistance values of the cadmium sulfide cells Cds and Cds' and the capacitances of the variable capacitance diodes Di and Di' change, and the filter time constant changes. changes. Next, photo shooting operation (S1609
), and after feeding the film (S1610), the film counter 22 is counted up (S1611).
) to complete the series of operations.

As explained above, the resistance value and capacitance are expressed as CP
By using an element that can be changed depending on the transmitted data of U1, it is possible to subdivide the switching points of the filter time constant without increasing the number of control signals.

[0048]

As is clear from the above, according to the present invention, in a magnetic recording data reproducing apparatus for reproducing information recorded in a magnetic recording section of a film, noise components in a reproduced signal can be removed and time can be improved. Since a filter whose constant can be switched, a mode setting means for setting a plurality of shooting modes, and a control means for switching the time constant of the filter according to the setting data of the mode setting means are provided, the S/ The N ratio can be increased and magnetic reproduction can be performed with high reliability.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing a schematic configuration of a first embodiment of a magnetic recording data reproducing apparatus according to the present invention.

FIG. 2 is a circuit diagram showing details of a playback head and a playback circuit.

FIG. 3 is a flowchart showing a series of operations of the embodiment shown in FIGS. 1 and 2;

FIG. 4 is a flowchart showing details of a film feeding operation in the process shown in FIG. 3;

FIG. 5 is a circuit block diagram showing a schematic configuration of a second embodiment of the present invention.

FIG. 6 is a circuit diagram showing details of the reproduction circuit shown in FIG. 5;

FIG. 7 is a flowchart showing the operation of the configuration of FIGS. 5 and 6;

FIG. 8 is a flowchart showing details of the feeding operation.

FIG. 9 is a characteristic diagram showing the relationship between changes in the number of film frames fed and feeding speed.

FIG. 10 is a characteristic diagram showing the relationship between temperature and film feeding speed.

FIG. 11 is a block diagram showing a third embodiment showing a schematic configuration of a magnetic recording data reproducing apparatus according to the present invention.

FIG. 12 is a flowchart showing the operation of the configuration of FIG. 11;

FIG. 13 is a flowchart showing details of the film feeding operation shown in FIG. 11;

FIG. 14 is a fourth example of the magnetic recording data reproducing device according to the present invention.
FIG. 1 is a block diagram showing a schematic configuration of an embodiment.

15 is a circuit diagram showing details of the reproduction circuit of FIG. 14. FIG.

FIG. 16 is a flowchart showing the operation of the circuit of FIGS. 14 and 15;

FIG. 17 is a circuit diagram showing the operation of FIGS. 5 and 6 in quiet mode.

FIG. 18 is a flowchart showing a feeding operation in quiet mode.

[Explanation of symbols]

1 CPU 2 Switch 3 Battery 4 A/D converter 5 Automation circuit 6 Reproduction head 7 Reproduction circuit 8 Comparator 9 Feeding circuit 10 Photo coupler 11, 12, 13 Amplifier 14 Filter circuit 15a, 15b, 15c, 15d Analog switch 16, 17 Amplification adjustment resistor 18 Single shooting/continuous shooting mode switching switch 19
Regeneration circuit 20 Filter circuit 21 Temperature detection circuit 22 Film counter 23 D/A converter 24 Regeneration circuit 25 Filter circuit 26a, 26b Thermistor

Claims (1)

[Claims] 1. A magnetic recording data reproducing device for reproducing information recorded on a magnetic recording section of a film, comprising:
A filter that removes noise components in a reproduced signal and whose time constant can be switched; a mode setting means that sets a plurality of shooting modes; and a control means that switches the time constant of the filter according to setting data of the mode setting means. A magnetic recording data reproducing device comprising: