JPS63155353A - Signal processor - Google Patents

Abstract

PURPOSE:To hold the state of a 1st microcomputer without increasing its packaging area when a 1st power supply is kept off by using the 1st microcomputer which works with the 1st power supply and a 2nd microcomputer which works with a 2nd power supply. CONSTITUTION:The 1st microcomputer, e.g., a system control microcomputer 2 works with the 1st power supply, e.g., a battery 1. While the 2nd microcomputer, e.g., a time data microcomputer 4 which works with the 2nd power supply, e.g., a Li battery 3. The data is always sent to the 2nd microcomputer 2 from the 1st microcomputer 2 and the microcomputer 4 substitutes the microcomputer 2 in case the power supply is turned off. Thus the working of the microcomputer 2 is always backed up by the microcomputer 4 working with the power supply 3 even though the power supply of the microcomputer 2 is turned off or the battery 1 is pulled out. Then the working state of the microcomputer 2 is held.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a No. G processing device suitable for use in portable equipment such as a portable video tape recorder.

[Summary of the invention]

The present invention provides a signal processing device suitable for use in portable equipment such as a portable video tape recorder, which includes a first microcomputer that operates with a first power source, and a second microcomputer that operates with a second power source. The first microcomputer always sends data to the second microcomputer, and when the first power is turned off, the second microcomputer performs the operations of the first microcomputer. This first
The state of the microcontroller can be maintained with a simple configuration without increasing the mounting area.

[Conventional technology]

In general, in a portable camera-integrated video tape recorder, when the power is turned off or the battery is drained for battery replacement, the value of the tape counter indicating how far the magnetic tape has been recorded is memorized. It is requested that it be kept. For this reason, conventionally, the system control microcomputer (microcomputer for system control) that holds the tape counter data of this camera-integrated video tape recorder was backed up using a super cab, etc., so that this tape counter data was retained even when the power was turned off. was.

[Problems to be solved by the invention] However, when this system microcomputer is backed up with a supercapacitor, etc., there is a limit to the retention time of this tape counter data (for example, about 10 minutes to 1 hour). Capacitors and the like have the disadvantage of being large in size and requiring a relatively large mounting area.

In view of the above, an object of the present invention is to propose a signal processing device that can lengthen data retention time and does not require a mounting area.

[Means for solving problems]

As shown in FIG. 1, the signal processing device of the present invention includes a first microcomputer, such as a system microcomputer (2), which operates on a first power source, such as a battery (1), and a second power source, such as a Li battery (1).
The second microcomputer (3), for example, a time date microcomputer (4), operates on the first microcomputer (2), and constantly transmits data from the first microcomputer (2) to the second microcomputer (4). When 1) is turned off, this second
The second microcomputer (4) performs the operations of the first microcomputer (2).

[Effect]

In the present invention, the first power source is turned off, that is, the power source f1)
When the battery (1) is turned off or the battery (1) is removed to replace the battery +11, the operation of the first microcomputer (2), for example, changes the value of the tape counter that indicates how far the magnetic tape (5) has been recorded. For example, the value is sent to the second microcomputer (4) operated by a Li battery (3), and this value is held by this second microcomputer (4), so at this time the first microcomputer (2) The state can be maintained by simple composition without increasing the mounting area.

〔Example〕

An embodiment of the signal processing device of the present invention will be described below with reference to the drawings. Figure 1 shows an example in which the present invention is applied to a portable camera-integrated video tape recorder. In Figure 1, (7) indicates the video camera body, and the video signals from the video camera body (7) are The video head (10) is connected to the video head (10) via the circuit (8) and the video signal processing circuit (9).
) and recorded on a magnetic tape (5) by this video head (10). Also (11
) indicates an electronic viewfinder, which is used to view the output video signal of this adder circuit (8). In this example, the video camera body (7), the magnetic tape (5)
) running etc. are performed by the microcomputer (2). In other words, in this system microcomputer (2), the drive J1 motor (12), the key bustan motor (13), the loading motor (14), etc. are controlled by the function key (I).
In response to the operation in step 5), the servo yarn and video system are controlled along with control. Historically, in this system microcomputer (2), a counter signal from a frequency generator provided on the reel is supplied to the counter signal input terminal (2a), this is used as a counter signal, and the value of this tape counter is input to the tape counter. The information is displayed on a display device (6).

Further, this system microcomputer (2) is configured to operate using power from, for example, a 5-inch battery (1). (16) is a power switch. Additionally, in this example, a function is provided to insert the date and time on the video screen.

That is, (4) indicates a time date microcomputer, and as is well known, this time date microcomputer (4) has a calendar function, and the date and time of this calendar function can be changed by operating the date and time setting key (17). being done. The date and time signals from this time date microcomputer (4) are converted into character signals via a character generator (18) and supplied to the addition circuit (8), and the character signals of this date and time signals are inserted into the video signal. Do as you please.

Since this evening/time date microcontroller (4) has a calendar function, a relatively long-life Li battery (3), for example, 3cm long (lifespan is about 2 years, for example) is used as its power source, and the The date microcomputer (4) is always backed up by this Li4 pond (3). In this example, a counter data storage area is provided in a part of the RAM (4a) provided in this time date microcomputer (4), and the system controller (2) is configured to This time date microcontroller (4) always uses the counter data of the second tape counter.
The counter data is supplied to the counter data storage area of the RAM (4a), and the latest counter data is stored in this counter data storage area. Also, when the power switch (16) of the system controller microcomputer (2) is turned on (including when the hardware (L) is replaced), the counter stored in the storage area of this RAM (4a) by the time date microcomputer (4) Data is transferred to this system microcontroller (
2). This configuration will be described in detail with reference to the flowchart in Figure 2.If the power switch (16) of the system microcontroller (2) is turned on from off, then this Determine whether the power switch (16) of the system controller microcomputer (2) is on. If the answer is No, that is, if the power switch (16) of the system controller microcomputer (2) is off, do nothing. This system microcontroller (2)
When the power switch (16) of the system controller (2) is on, the counter signal input terminal (2a) of the system microcomputer (2) is supplied with counter data indicating the tape position which is processed by the counter and is stored in the RAM (4) of the time date microcomputer (4). 4a)
will continue to be supplied to the storage area.

Also, what about the system microcontroller (2)? ll! power switch (1
6) is turned on from off, the RAM (4a) of the time date microcontroller (4), which is always backed up
) is sent to the system computer microcomputer (2), and the magnetic tape (5) is sent until the count value of the counter of the system computer microcomputer (2) matches the counter data stored in this jPr. The next operation, for example, recording, is performed from the point where the distances match.

In such a portable camera-integrated video tape recorder, the video signal from the video camera body (7) is transferred to the magnetic tape (5) by the action of the system computer microcomputer (2) in accordance with the operation of the funk system key (15). In addition to recording the video signal, it is also possible to insert the date and time signal from the time date microcomputer (4) into this video signal. At this time, the tape counter display device (
6), counter data indicating the running position of the magnetic tape (5) is displayed.

In this example, the power switch (16) of the system microcomputer (2) is turned off (the same applies when this battery (11) is removed in order to replace the battery (1)).
Even when the tape counter data is always bank-amplified, it is stored in the RAM of the time date microcomputer 141 (
4a) is stored and memorized in a part of the storage area of
is turned on (the same applies when the battery (1) is inserted), the tape counter data stored in this time date microcontroller (4) is sent to this system controller microcontroller (2), and this tape By controlling the running of the magnetic tape (5) based on counter data,
Good recording can be performed on this magnetic tape (5). In addition, this time date microcomputer (4) is backed up by a power supply with a long life, for example, about two years, for example, a 1.14 battery (3), so there is an advantage that the tape counter data can be retained for a relatively long time when it is turned off. be.

Further, according to this example, since only a part of the RAM (4a) of the existing time date microcomputer (4) is used, there is an advantage that no mounting area is required.

In the above example, the present invention is applied to hold tape counter data, but it is also suitable to use the present invention as a countermeasure against duels in video tape recorders.

In other words, a portable video tape recorder has a due sensor attached to its drum, and once this drum enters the due state, the dew will not disappear for a while even if the due sensor is released, so generally no operation will be performed by the system microcomputer for about an hour. It is prohibited in (2). By the way, if there is no backup system like the system microcontroller (2), if the battery +1) is removed during this 1-hour count, the count will be stopped at that point (the counter will be reset), and it will start again immediately. When this battery (1) is inserted, from that point on, this system microcomputer (2) is 9? Js' work was accepted, and there was a risk that the magnetic tape (5) would be damaged during the recording. Therefore, the system is configured as shown in Fig. 1, and the one-hour count after the due sensor is released is counted when the system microcomputer (2) is powered off (the same applies when the battery ti> is disconnected).
At that time, the time date microcomputer (4) continues to count this one hour, and the system controller C21 again.
When the power to the system controller (2) is turned on (the same applies when the battery (1) is inserted), this time date microcontroller (4) receives this count data, and this system controller microcontroller (4) receives this count data. 2) may be prohibited from accepting the key. Regarding this, the configuration of Figure 1 and Figure 3
This will be explained in detail using the flowchart in the figure. In this example as well, this due data is always exchanged between the system computer microcomputer (2) and the time date microcomputer (4) while the system computer microcomputer (2) is operating.

First, when the dew sensor in the system controller microcomputer (2) detects dew, the key holder of the system controller microcomputer (2) is prohibited from attaching, and then the dew sensor determines whether dew has been released, and if the dew has not been released, continues as is, but when the duel is released, the duel release timer starts counting and the count of this duel release timer becomes 1.
When the time has passed, this system microcontroller (2)
The key holder allows attachment. Also, the deactivation/release timer count did not reach 1 hour, and the system microcontroller (
2) power switch (16) is off or the battery (1
) is omitted, the following is done. In other words, the time date microcomputer (4) determines whether the system controller microcomputer (2) is powered off, and when this source is off, checks whether the due release timer of the system controller microcomputer (2) is counting. Judge, this due PI! ? , When the exclusion timer is counting, this time date microcomputer (4) continues counting the due release timer, and this time date microcomputer (4) checks whether the illumination of the system controller microcomputer (2) has been turned on from off. When the power of this system controller microcontroller (2) is turned on from OFF, the count value of this dual release timer is sent to the system controller microcontroller (2).
Transfer to. When the power switch (16) of the system controller microcomputer (2) is turned on again or the battery f1+ is inserted, the count value of the due release timer from this time date microcomputer (4) is received and transferred to this system controller microcomputer (2). , determines whether the count of the duty release timer has exceeded 1 hour or not, and if 1 hour has passed, the key receiver of this system microcomputer (2) allows the key release, and 1 hour has not elapsed. Sometimes, the due-release timer continues counting and the above-mentioned operation is repeated.

It goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations can be taken without departing from the gist of the present invention.

[Effects of the Invention] According to the present invention, when the first microcomputer, for example, the system microcomputer (2) is powered off or the battery (11) is disconnected, the operation of the system microcomputer (2) is always maintained by a backup power source ( 3), the state of the first microcomputer (2) can be maintained with a simple configuration, and there is an advantage that the mounting area does not increase. be.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the signal processing device of the present invention;
FIGS. 2 and 3 are diagrams that serve to explain the invention, respectively. (1) is the battery, <2) is the dicomma icon, (
2a) is a counter signal input terminal, (3) is a Li battery, (
4) is a time date microcomputer, (48) is a RAM, (5)
) is a magnetic tape, (6) is a tape counter display device, (
7) is the video camera body, (10) is the magnetic head, (1
5) is a function key, (16) is a power switch, and (17) is a date and time setting key.

Claims (1)

[Claims] It consists of a first microcomputer that operates with a first power supply and a second microcomputer that operates with a second power supply, and the first microcomputer always transmits data to the second microcomputer, and the first microcomputer always transmits data to the second microcomputer. A signal processing device characterized in that when the power source of the signal processing device is turned off, the second microcomputer performs the operation of the first microcomputer.