JP3077767B2 - Camera with magnetic recording data reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic recording data reproducing apparatus.
The present invention relates to a camera provided with a device .

[0002]

2. Description of the Related Art Conventionally, as a method of reading film information of a camera, there is a method of electrically reading a CAS code from a patrone and inputting a film sensitivity, the number of shootable images, and the like.

Further, 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 a magnetic head and a magnetic recording data reproducing apparatus provided on a camera side provide information to the magnetic recording section. A method of magnetically recording (film information, photographing information, etc.) has been proposed.

[0004]

However, in the magnetic recording in the above-mentioned conventional example, reproduction is performed by a constant speed feed of a data recorder or the like. However, when trying to reproduce magnetic recording in response to the film feed of the camera, the film condition (for example, the film pulling load due to the change in the spool diameter or the winding state due to the difference of the film frame) changes, and the film feeding speed changes. Is very large, so that the frequency and amplitude of the reproduced signal change accordingly. This causes a decrease in the S / N ratio (signal-to-noise ratio) of the reproducing apparatus, and the reproduced signal has low reliability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording data reproducing apparatus capable of preventing a decrease in the S / N ratio and obtaining a highly reliable reproduced signal. Is to provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides information recorded on a magnetic recording portion of a film.
Equipped with a magnetic recording data reproducing device for reproducing information
In the camera, removing noise components in the playback signal
The filter whose time constant is variable and the shooting mode of the camera
Depending on the shooting mode, when the shooting mode is single shooting and continuous shooting,
That control means for switching the time constant of the filter
A camera equipped with a magnetic recording data reproducing device,
You.

Further, the information is recorded on a magnetic recording portion of the film.
Equipped with a magnetic recording data reproducing device for reproducing the information
The noise component in the playback signal in a camera
Together with a filter whose time constant is variable and the number of film frames
Control means for switching the time constant of the filter,
Provided with a magnetic recording data reproducing device characterized by that
Camera and also recorded on the magnetic recording section of the film.
Equipped with a magnetic recording data reproducing device for reproducing the
The noise component in the playback signal
And a filter with a variable time constant
Temperature detecting means for detecting, and the temperature detected by the temperature detecting means.
Switch the time constant of the filter based on the temperature information
Magnetic recording data provided with control means
A camera with a playback device, and
Magnetic recording data for reproducing information recorded in the magnetic recording unit.
In a camera equipped with a data playback device,
Filter that removes noise components and changes its time constant
Voltage detecting means for detecting a power supply voltage;
When the voltage is low based on the voltage information detected by the stage
The time constant of the filter is set to be smaller than when the voltage is high.
Control means for switching to a low state is provided.
This is a camera provided with a magnetic recording data reproducing device.

[0008]

According to the above-mentioned means, the film feeding speed greatly changes depending on the film state and the like, and the S / N decreases as the film feeding speed increases. The time constant of the filter provided in the signal system is changed by the control means, and the time constant circuit is constituted by a variable capacitance element and a variable resistance means. As a result, the S / N ratio can be improved, and highly reliable magnetic reproduction can be performed.

The variable resistance means constituted by the light emitting element and the light receiving element whose resistance changes in accordance with the amount of light received from the light emitting element is capable of generating a voltage corresponding to a change factor of the feeding speed. , The luminance changes according to the voltage value, the internal resistance of the light receiving element changes according to the luminance, and the time constant of the filter changes. Therefore, with a simple configuration, the time constant changes continuously, and it is possible to cope with a wide range of film feeding speed.

[0010]

FIG. 1 is a circuit diagram showing a schematic configuration of a first embodiment of a magnetic recording data reproducing apparatus according to the present invention (here, it is assumed that the present invention is applied to a camera using a film having a magnetic recording unit). It is a block diagram.

Reference numeral 1 denotes a CPU (central processing unit) for performing overall control, to which the following members are connected. Reference numeral 2 denotes a switch connected to the CPU 1 for starting a photographing operation, and 3 denotes a battery (V) serving as a power supply for driving the entire system.
_BAT ), 4 is an A / D converter for converting an analog voltage value of the battery 3 into a digital value and sending it to the CPU 1, 5 is an AE (automatic exposure) circuit for performing photometry, distance measurement, and photographing operation,
An automatic circuit including an F (auto focus) circuit and an SH (shutter) circuit, 6 is a reproducing head for detecting magnetic recording data as a signal, 7 is a reproducing circuit for amplifying a signal detected by the reproducing head 6, and 8 is a reproducing circuit. A comparator which converts the magnetic recording signal amplified by 7 into a digital signal and sends it to the CPU 1, and 9 is a feeding circuit constituted by using a bridge circuit for driving a motor M for feeding a film. is there. Reference numeral 10 denotes a photocoupler that generates a pulse by repeating light and dark 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 the reproducing circuit 7.

Each of 11, 12, and 13 has a read head 6
This is an amplifier for amplifying the reproduced signal of the magnetic recording data outputted therefrom, and is connected in series in three stages. Among them, for example, TL592 of Texas Instruments can be used for the amplifiers 11 and 12, and TL071 can be used for the amplifier 13. Reference numeral 14 denotes a filter circuit for cutting noise or the like of the reproduction signal amplified by the amplifier 11, and reference numerals 15a, 15b, 15c, and 15d denote filter circuits 1
An analog switch for switching a time constant of 4 (depending on the combination of the resistors R ₁ and R ₂ and the capacitors C ₁ and C _{2 and} the combination of the resistors R ₁ ′ and R ₂ ′ and the capacitors C ₁ ′ and C ₂ ′); Reference numerals 16 and 17 are amplification degree adjustment resistors connected between the input and output of the amplifiers 11 and 12 to determine the amplification degree. The resistors R ₁ and R ₂ are connected in series to form an amplifier 11.
Connected to one output terminal, and similarly connected to the resistor R ₂ ′,
R ₁ ′ is connected in series and connected to the other output terminal of the amplifier 11. To each of the resistor R ₂ and the resistor R ₂ 'analog switches 15c, each of 15d are connected in parallel to parallel. Furthermore, between the output side and the ground resistor R ₁ capacitor C ₁ is connected, 'Between the delivery side and the ground of the capacitor C _1' resistor R ₁ is connected. Then, the capacitor C ₁ analog switch 15a and a capacitor C ₂ connected in series are connected in parallel, the capacitor C ₁ 'is the analog switch 15b and a capacitor C ₂ connected in series' are connected in parallel.

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

First, the state of the switch 2 is checked (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, compared with the camera drivable minimum voltage data V _min which is previously set the digital data in the CPU 1 (S
303) If the digital data is less than the data _Vmin , the operation ends. In the case of more than V _min proceeds to photography operation (S304). In this photography operation,
Using the automation circuit 5, known photometry and ranging are performed, and photographing is performed based on the data. Thereafter, the film is fed (S305), and the series of operations is completed. The magnetic recording data is detected as a signal by the reproducing head 6 during the film feeding operation in S305, the signal is amplified by the reproducing circuit 7, and is converted into a digital signal by the comparator 8, and then the CPU.
It is taken into 1.

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

[0017] (processing result of step 304) photographing operation is finished, the remaining voltage digital data of the battery 3 and compares the filter time constant switching point voltages V ₁ previously set (processing result of step 302) (S401),
Digital data the analog switch 15a from CPU1 If V ₁ is less than the analog switches 15a to "H" level filters the signal sent to 15b, 15b were to ON, by analog switches 15c, 15d are OFF, the time constant Is set (S402). Also, if the digital data is V ₁ or more, the analog switches 15a from CPU 1, 1
5b is set to "L", the analog switches 15a and 15b are turned off, and the analog switch 15b is turned off.
By turning on c and 15d, a high-speed filter having a high time constant is set (S403). Step 40
After the filter is set by 2 or 403, the counter inside the CPU 1 that counts the pulses generated by the photocoupler 10 is reset (S404) to start the feeding circuit 9 (S405), and the pulses that rotate following the feeding motor are rotated. The counting of the pulses generated from the photocoupler 10 by the plate is started (S406). Photocoupler 10 to C
It is detected whether a pulse has been sent to PU1 (S41).
0), if a pulse is sent, the pulse count is incremented (S407). If no pulse is sent, the magnetic recording data of the film is detected and amplified by the reproducing head 6 and the reproducing circuit 7, and is digitally output by the comparator 8. The signal 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 processing (S407), it is determined whether or not the pulse count is equal to or greater than a preset feed stop count C1 (S408). If the pulse count is less than C1, the pulse count processing is performed again. Returning to (S407), when the pulse count exceeds C1, the feeding circuit 9 is stopped (S409), and a series of feeding operations is ended.

As described above, the filter is gradually switched between high-speed and low-speed according to the remaining voltage of the battery 3, so that the band of the unnecessary filter corresponds to the magnetic recording data reproduction frequency that follows the film feeding speed. By reducing the number, the influence of noise and the like can be reduced, and the ability to reproduce magnetically recorded data can be improved.

In the above-described embodiment, only one filter switching point is used. However, by actually having a plurality of switching points, it is possible to further improve the magnetic recording data reproduction capability.

In the above-described embodiment, the filter time constant corresponding to only the change in the feeding speed due to the remaining voltage of the battery 3 is switched. However, depending on the camera, even if the remaining voltage of the battery 3 is the same, the setting is not performed. The feeding speed may be different depending on the mode. For example, in the case of switching between single shooting / continuous shooting mode of shooting by a camera, in continuous shooting, the gear of a feeding system is switched to increase the feeding speed, and feeding is completed in a shorter time than in single shooting. There are things. An example corresponding to 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. In this embodiment, the same reference numerals are used for the same components as those in the embodiment of FIG.

This embodiment is characterized in that a single / continuous shooting mode switch 18 is provided in addition to the configuration shown in FIG. In the present embodiment, the signal transmitted from the CPU 1 to the reproduction circuit 19 is a filter signal 1 (Fil).
ter-1) and a filter signal 2 (Filter-2).

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

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

FIG. 7 is a flowchart showing the operation of the configuration shown in FIGS.

First, the state of the single / continuous mode switch 18 is checked, and whether the mode is single mode or continuous mode is stored as data of the CPU 1 (S701).
Next, the state of the switch 2 is checked (S702). 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 converted to digital data.
It is stored in PU1 (S703). Then, compared with the camera drivable minimum voltage data V _min which is previously set digital data in CPU1 and (S704), if it is less than the digital data V _min to end operation. Also,
In the case of more than V _min to migrate to the photo imaging operation (S705). In this photographing operation, known photometry and distance measurement are performed using the automation circuit 5, and photographing is performed based on the data. Thereafter, the film is fed (S706), and the series of operations is terminated. The magnetic recording data is detected as a signal by the reproducing head 6 during the film feeding operation in S706,
The signal is amplified by the reproduction 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-shot / continuous-shot mode data (determination result of step 701) is determined (S801), and the remaining voltage digital data of the battery 3 (processing result of step 703) and the filter time constant switching point V _{1 are determined.} Are compared (S802 and S803). If the digital data is less than V ₁ of the _{(A / D Data <V 1} ) in a single shot mode, the filter signal 1 to the "H" level, the filter signal 2 "L" in the level set single shooting slow filter ( S8
04). Also, when the digital data is V
₁ or more (A / D Data> V ₁ ), filter signal 1
Then, both the filter signal 2 and the filter signal 2 are set to the “L” level to set a single-shot high-speed filter (S805).

On the other hand, when the digital data is V
_If less than ₁ (A / D Data <V ₁ ), filter signal 1
Is set to the "H" level, the filter signal 2 is set to the "H" level, and the continuous shooting low-speed filter is set (S806). Moreover, if the digital data is V ₁ or more in the continuous shooting mode,
The filter signal 1 is set to the “L” level, the filter signal 2 is set to the “H” level, and the continuous shooting high-speed filter is set (S8).
07). After the filter setting process in any of steps 804 to 807, the counter inside the CPU 1 that counts the pulses generated by the photocoupler 10 is reset (S808) to start the feeding circuit 9 (S80).
9) The counting of pulses generated from the photocoupler 10 by the palace plate rotating following the feed motor is started (S810). It is detected whether or not a pulse has been sent from the photocoupler 10 to the CPU 1 (S814). If a pulse has been sent, the pulse count is increased (S81).
1) If no pulse is sent, the magnetic recording data of the film is detected and amplified by the reproducing head 6 and the reproducing circuit 19, converted into a digital signal by the comparator 8 and taken into the CPU 1 (S815), and subjected to the pulse detection processing again (S815). It returns to S814). Pulse count processing (S81
1) Thereafter, it is determined whether or not the pulse count is equal to or greater than a preset feed stop count C1 (S812). If the pulse count is less than C1, the pulse count processing (S813) is performed again. Returning, if the pulse count exceeds C1, the feeding circuit 9 is stopped (S81).
4), a series of feeding operations ends.

As described above, by switching the filter time constant in the photographing mode in addition to switching the filter time constant in accordance with the remaining voltage of the battery 3, magnetic recording data reproduction can be performed even in a camera whose feeding speed changes depending on the photographing mode. Ability to improve.

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

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

In this embodiment, the same members as those in the above-mentioned embodiments are denoted by the same reference numerals, so that the duplicated description will be omitted here and only the added parts will be described. 2
Reference numeral 1 denotes a temperature detecting circuit for changing the voltage according to the temperature using a thermistor and sending the voltage as digital data to the CPU 1, and reference numeral 22 denotes a film counter for recording the number of film frames, all of which are connected to the CPU 1.
The detailed circuit configuration of the reproducing circuit 19 shown in FIG. 11 of this embodiment is shown in FIG.

FIG. 12 is a flowchart showing the operation of the configuration of 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 or not (S1202), A / D conversion of the remaining voltage of the battery 3 and data storage (S1) are performed.
203) performs, compared with a preset camera drivable minimum voltage data V _min in the CPU 1 (S120
4) and, in the case of more than V _min feed from the temperature detection circuit 21 the temperature data to the CPU 1 (S1205), and then performs the photographing operation (S1206), the feeding of the film (S1
207), the film counter 22 is counted up (S1208), and a series of operations is ended.

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

The photographing operation (S1206) after the completion of the comparison the filter time constant switching point data T ₁ set in advance (the processing result of the S1205) temperature data Temp and (S1301), further, the processing result of the film counter data (S1201 ) Is compared with preset filter time constant switching point data F _C1 (S1302).
1303) When (temperature data Temp <T ₁ ) and (film counter data> F _C1 ) are satisfied, the filter signal 1 is set to the “H” level and the filter signal 2 is set to the “L” level for low-temperature low-speed operation. Set the filter (S1
304). When (temperature data Temp <T ₁ ) and (film counter data ≦ F _C1 ) hold, the filter signal 1 is set to the “L” level and the filter signal 2 is set to the “L” level to execute the low-temperature high-speed filter. Set (S1305). Further, (temperature data Temp ≧
T ₁ ) and (film counter data> F _C1 )
The filter signal 1 and the filter signal 2 are set to the “H” level to set the high-temperature / low-speed filter (A1306). If (temperature data Temp ≧ T ₁ ) and (film counter data ≦ F _C1 ), the filter signal 1 is set to “ The filter is set to L level and the filter signal 2 is set to H level to set the high temperature / high speed filter (S1307). Step 13
After the filter setting process by any of 04 to 1307, the counter inside the CPU 1 that counts the pulses generated by the photocoupler 10 is reset (S1308) to start the feeding circuit 9 (S1309) and follow the feeding motor. Then, counting of pulses generated from the photocoupler 10 by the rotating pulse plate is started (S1310). It is detected whether or not a pulse has been sent from the photocoupler 10 to the CPU 1 (S1314). If a pulse has been sent, the pulse count is increased (S1311). If no pulse has been sent, the magnetic recording data of the film is read. The signal is detected and amplified by the reproducing head 6 and the reproducing circuit 19, converted into a digital signal by the comparator 8 and taken into the CPU 1 (S 1315), and subjected to the pulse detection processing again (S 1314).
Return to After the pulse count processing (S1311), it is determined whether or not the pulse count is equal to or greater than a preset feed stop count C1 (S131).
2) If the pulse count is less than C1, the process returns to the pulse count process (S1313) again, and if the pulse count exceeds C1, the feeding circuit 9 is stopped (S131).
4), a series of feeding operations ends.

As described above, by switching the filter time constant in accordance with the feeding speed that changes depending on the number of film frames and the environmental temperature, the ability to reproduce magnetic recording data can be improved.

In the above-described embodiment, the switching of the filter time constant of the reproducing circuit is performed by the analog switch. However, in order to further divide the filter time constant switching point in order to further improve the reproducing capability, the number of analog switches must be increased and Since an increase in the number of control signals is required, it causes a cost increase.

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

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

In this embodiment, the same reference numerals are used for the same components as those in the above-mentioned embodiments. Therefore, the duplicate description will be omitted here, and only the changed or added portions will be described. This embodiment is basically the same as the configuration of FIGS. 5 and 9 except that the CPU 1 has a battery 3 remaining voltage data, a data of the single / continuous shooting mode changeover switch 18 and a temperature detection which are factors for changing the feeding speed. 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 is stored in the CPU.
1 and further includes a D / A converter 23 for converting the digital data output from the digital data table into analog data and outputting the analog data to the reproducing circuit 24.

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

Basically, it is the same as FIG. 2, but is characterized by the configuration of the filter. That is, the filter circuit 25
Light-emitting diodes LED and LED 'as light-emitting elements connected to D / A converter 23, and amplification adjustment resistor 1
6 light emitting diodes LE inserted into each of the output lines.
C, cadmium sulfide cells Cds, Cds 'as light receiving elements paired with D, LED', and variable capacitance diodes Di, D
i ′. In the figure, RB, R
B ′ is a bias resistor, and has a variable capacitance diode Di,
It is inserted between Di ′ and the output of the D / A converter 23.

In this configuration, the brightness of the LED and LED 'changes according to the input voltage from the D / A converter 23,
The resistance of the cadmium sulfide cells Cds, Cds 'and the capacitance of the variable capacitance diodes Di, Di' are determined.
Therefore, the time constant can be changed continuously with a simple configuration, and the time constant can be changed in two steps, that is, switching between low-speed and high-speed can be performed in each of the above embodiments. It can correspond to speed.

FIG. 16 is a flowchart showing the operation of the circuits shown in FIGS.

After the switch 2 is turned on (S1601), the state of the single / continuous shooting mode switch 18 is checked and stored as data of the CPU 1 (S1602). Next, check the state of the film counter 22,
The contents are stored as data of the CPU 1 (S1603).
Let it. Subsequently, the remaining voltage of the battery 3 is stored in the A / D converter 4.
Comparison is converted into digital data, it is stored (S1604) as the CPU1 data, and is set in advance camera drivable minimum voltage data V _min by (S1605)
Then, the remaining voltage data of the battery 3 (the processing result of S1604) is V
When it is less than _min completed the operation, in the case of more than V _min storing temperature data from the temperature detecting circuit 21 to the CPU 1 (S
1606). Next, single shooting / continuous shooting mode data (S1
602), film counter data (processing result of step 1603), battery 3 data (step 16)
04) and temperature data (processing result of step 1606), and selects / outputs corresponding data from a digital data table in the CPU 1 (S1607). To a voltage and output to the filter circuit 25 of the reproducing circuit 24 (S
1608). For example, in the continuous shooting mode, under conditions where the film feeding speed is high, such as at room temperature with a new battery, data such that the output voltage of the D / A converter 23 becomes high is output to the CPU.
By selecting / outputting within 1, the light emitting diode LED,
The brightness of the LED's increases, thereby reducing the resistance of the cadmium sulfide cells Cds, Cds'. Also, the capacitance of the variable capacitance diodes Di and Di 'is reduced. As a result, the time constant of the filter circuit 25 increases, and reproduction in a high frequency band becomes possible. Similarly, under the condition that the film feeding speed is low, the D / A converter
By selecting / outputting data that lowers the output voltage, the resistance values of the cadmium sulfide cells Cds and Cds 'are large and the capacitances of the variable capacitance diodes Di and Di' are large, so that the time constant of the filter circuit 25 is small. That is, only the low frequency band can be reproduced, so that the influence of high frequency noise and the like can be reduced. That is, the voltage applied to the filter circuit 25 changes based on the data of the feed speed change factor, the resistance values of the cadmium sulfide cells Cds, Cds 'and the capacitances of the variable capacitance diodes Di, Di' change, and the filter time constant changes. Changes. Next, the photographing operation (S1609) is performed, and after the film is fed (S1610), the film counter 22 is counted up (S1611), and the series of operations ends.

FIG. 17 is a circuit diagram showing a main part of a modification of FIG.

In this embodiment, the thermistors 26a and 26b having direct temperature coefficients are used instead of the filter circuit 25 shown in FIG.
This is an example using. These thermistors 26a, 26b
The resistance value changes depending on the temperature of the installation atmosphere, and the same operation as in the case of FIG. 15 can be performed.

As described above, the resistance and the capacitance are expressed as CP
By using an element that can be changed by the transmission data of U1, the switching point of the filter time constant can be subdivided without increasing the number of control signals.

[0051]

Since the present invention is constituted as described above, the following effects can be obtained.

A magnetic recording data reproducing apparatus according to claim 1 is provided.
Camera, recorded on the magnetic recording section of the film.
Equipped with a magnetic recording data reproducing device for reproducing the information
The noise component in the playback signal in a camera
And a filter whose time constant is variable,
Depending on the mode, when the shooting mode is single shooting and continuous shooting,
A control means for switching the time constant of the filter is provided.
A camera provided with a magnetic recording data reproducing apparatus characterized by the following:
Filter characteristics suitable for continuous shooting and single shooting
Can be set to

A magnetic recording data reproducing apparatus according to claim 2 is provided.
Camera, recorded on the magnetic recording section of the film.
Equipped with a magnetic recording data reproducing device for reproducing the information
The noise component in the playback signal in a camera
Together with a filter whose time constant is variable and the number of film frames
Control means for switching the time constant of the filter,
Provided with a magnetic recording data reproducing device characterized by that
Camera, the number of film frames being fed
, The filter characteristics can be switched. Ma
A camera provided with the magnetic recording data reproducing apparatus according to claim 3.
In, the information recorded on the magnetic recording part of the film
Camera with magnetic recording data reproducing device for reproducing
In, while removing the noise component in the reproduction signal,
A filter with a variable time constant and a temperature for detecting the ambient temperature
Temperature detecting means, and temperature information detected by the temperature detecting means.
Control means for switching the time constant of the filter based on the
Magnetic recording data reproducing device characterized by having a step
The camera is equipped with a filter.
Sex can be switched. Furthermore, the magnet according to claim 4
For cameras equipped with a recorded data playback device,
For reproducing information recorded in the magnetic recording section of the
In a camera equipped with a recording data reproduction device, a reproduction signal
The noise component inside is removed and the time constant is variable.
A voltage detecting means for detecting a power supply voltage;
The voltage is low based on the voltage information detected by the detection means.
The time constant of the filter is higher than when the voltage is high.
It is characterized by the provision of control means for switching to a low constant state.
Camera with a magnetic recording data reproducing device
Therefore, the filter characteristics can be switched by the voltage.
Wear.

[Brief description of the drawings]

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 reproducing head and a reproducing 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 a 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 a feeding operation.

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

FIG. 10 is a characteristic diagram showing a relationship between a temperature and a 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 processing of a film feeding operation in FIG. 11;

FIG. 14 shows a fourth embodiment of the magnetic recording data reproducing apparatus according to the present invention.
It is a block diagram showing a schematic structure of an example.

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

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

FIG. 17 is a circuit diagram showing a main part of a modification of FIG.

[Explanation of symbols]

 DESCRIPTION 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 Photocoupler 11, 12, 13 Amplifier 14 Filter circuit 15a, 15b, 15c, 15d Analog switch 16, 17 Amplification degree adjustment resistor 18 Single-shot / continuous-shot mode switching switch 19 Reproduction circuit 20 Filter circuit 21 Temperature detection circuit 22 Film counter 23 D / A converter 24 Reproduction circuit 25 Filter circuit 26a, 26b Thermistor Cds, Cds' Cadmium sulfide cell Di, Di 'variable capacitance diode LED, LED' light emitting diode

Claims (4)

(57) [Claims] 1. Information recorded on a magnetic recording portion of a film
With magnetic recording data reproducing device for reproducing
The noise component in the reproduced signal, and the time constant
Shooting according to the variable filter and camera shooting mode
When the mode is single or continuous, the filter
Characterized in that control means for switching the number is provided.
A camera equipped with a recorded data playback device. 2. Information recorded on a magnetic recording portion of a film
With magnetic recording data reproducing device for reproducing
The noise component in the reproduced signal, and the time constant
Variable filter and filter according to the number of film frames
Control means for switching the time constant of the
Provided with a magnetic recording data reproducing device. 3. Information recorded on a magnetic recording portion of a film
With magnetic recording data reproducing device for reproducing
In La Eliminates noise components in the playback signal and its time constant
Variable filter and temperature detecting means for detecting environmental temperature
And temperature information detected by the temperature detecting means.
Control means for switching the time constant of the filter
A camera equipped with a magnetic recording data reproducing device
La. 4. Information recorded on a magnetic recording portion of a film
With magnetic recording data reproducing device for reproducing
In La The noise component in the playback signal is removed and the time constant
Variable filter and voltage detecting means for detecting power supply voltage
And voltage information detected by the voltage detecting means.
When the voltage is low, the time constant of the filter is
Control means to switch to a state with a lower time constant than
Provided with a magnetic recording data reproducing apparatus, characterized in that
Mela.