JP3190709B2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic apparatus suitable for application to video equipment such as a VTR (video tape recorder).

[0002]

2. Description of the Related Art Conventionally, in electronic equipment such as a VTR,
There is a device in which a bus line to which data can be input from the outside is provided inside the device, and an operation instruction can be directly given to an internal circuit through the bus line from the outside. For example, VT
Some Rs include a control bus line used for editing or the like. FIG. 3 shows a connection example of this VTR. As shown in FIG. 3, two VTRs, a VTR 1 on the reproduction side and a VTR 2 on the recording side, and an editing controller 3 for controlling the two VTRs are prepared. And each VTR
Signal line (bus line) capable of bidirectional communication between 1 and 2
Connect with. The operation of the keys arranged on the editing controller 3 controls the reproduction operation of the video tape mounted on the VTR 1 and the recording operation of the video tape mounted on the VTR 2, and controls the operation on one tape. An editing operation for recording the recorded predetermined video signal on the other tape is performed.

On the other hand, there is an electronic device provided with a bus line for sending a command necessary for adjusting an internal circuit, separately from such an operation control bus line. This bus line can send a command to each integrated circuit (IC) inside the electronic device. For example, a command to change a setting state of a variable element in a specific integrated circuit is sent through this bus line. Send. In this case, instead of issuing this command from the central control device inside the electronic device, it is possible to supply the command from an external adjusting device so that the command can be used at the time of various services.

That is, when it becomes necessary to adjust this kind of electronic equipment due to repair or the like, an adjusting device is connected to an adjusting bus line, and an internal integrated circuit directly changes the adjusting state via this bus line. You can send instructions and perform repairs. As the data configuration of the adjustment bus line, for example, it is conceivable that the ID number of the IC to be adjusted in the device, the ID number of the adjustment item in the IC, and the data of the adjustment amount are sequentially transmitted.

[0005]

However, the operation state control bus line and the adjustment bus line of the electronic device described above are completely different from each other, and if each bus line is provided, one electronic device is provided. Since a plurality of bus lines exist in the device, there is a disadvantage that the configuration becomes complicated accordingly. That is, when preparing such a bus line, it is necessary to provide an interface circuit that matches the communication system of each bus line inside the integrated circuit,
If a plurality of bus lines exist, each integrated circuit in the device has a plurality of interface circuits, resulting in a complicated configuration.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to enable operation state control and circuit adjustment to be performed via a single bus line.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an electronic apparatus having a terminal capable of bidirectionally transmitting control data for instructing various operations with an external apparatus through a single transmission line. communication of a predetermined number of words is performed by the mode control data to be transmitted at a particular word of life peripheral that obtained at a terminal, bi-directional communication mode at this terminal, various operations receives various operation instructions to the electronic device A mode for sending status ,
It is obtained as Waru switched to a mode for the reception and transmission of operation program of the microcomputer for controlling the electronic device.

[0008]

With this configuration, the state of each circuit in the electronic device can be known by the external device using the control data communication line, and the operating program can be changed from the external device. Can be adjusted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In this embodiment, the present invention is applied to a VTR, and is configured as shown in FIG. That is, in FIG.
Numeral 0 indicates the entire VTR. The VTR 10 has a system controller 11 composed of a microcomputer therein, and various circuits in the VTR operate under the control of the system controller 11. In this case, a memory 12 is connected to the system controller 11, and a program necessary for controlling the operation of each circuit is stored in the memory 12. This control program is stored in a separate area (address) for each circuit controlled by the system controller 11, and can be individually rewritten for each area under the control of the system controller 11.

The system controller 11 is connected to each circuit block in the VTR via a bus line. That is, a recording / reproducing system circuit 13 for performing modulation for recording a video signal on a video tape and demodulation of a reproduced video signal, and processing of a video signal supplied to the recording / reproducing system circuit 13 in a base band. A video processing system circuit 14 in which a servo control of a running system of a video tape is performed, and a motor drive control circuit 16 for driving a motor for rotating a rotary head drum and the like, The respective circuits 13, 14, 1
5 and 16 are composed of different integrated circuits. The microcomputer on each of the circuits 13, 14, 15, 16 and the system controller 11 are connected by a bus line, and the circuits 13, 14, 15, 16 are supplied from the system controller 11 via the bus line. It operates based on the control data that is input.

The system controller 11 is connected to a digital / analog converter 17 via a bus line, and converts the analog signal converted by the digital / analog converter 17 into each of the circuits 13, 14, 15, 16 The circuit which can be controlled by the analog signal (ie, the circuit which cannot be controlled by the digital data) is also supplied to the system controller 11.
Can be controlled.

A bus line for connecting an external device to the system controller 11 is provided. A terminal (not shown) for connecting the external device to the bus line is provided on the VTR 10. The bus line is configured to enable bidirectional communication, and data for controlling the operation of the VTR is supplied from the outside via the bus line, so that the system controller 11 performs a corresponding operation. The operation status of the VTR under the control of the system controller 11 is supplied to external devices via this bus line. The bus line connected to this external device is mainly provided to connect other VTRs and editing devices, and to operate multiple VTRs in tandem to facilitate editing work such as dubbing. It was done.

In this embodiment, an adjusting device can be connected to the bus line to which the external device is connected. That is, in the example of FIG.
10 shows an example in which the adjusting device 4 is connected, and a command output from the adjusting device 4 is connected to the VT via the bus line.
The program reaches the system controller 11 of R10, and the program stored in the memory 12 connected to the system controller 11 can be rewritten based on this command. Also, the VTR is sent from the system controller 11 to the adjustment device 4 via this bus line.
Ten operating conditions are provided.

The adjusting device 4 includes an analog / digital converter 4a, and a predetermined circuit (for example, the recording / reproducing system circuit 13) in the VTR 10 outputs a level of an analog signal output according to an operation state. The determination can be made on the adjustment device 4 side.

Note that communication performed via a bus line when the above-mentioned other VTR or editing device is connected,
The same communication method is used for communication performed via the bus line when the adjustment device 4 is connected, and the system controller 11 determines which party to communicate with using a category code added to the head of one unit of data. I can do it.

Here, a communication system performed between the system controller 11 and another device will be described with reference to FIG. 2. In this example, one field period of a video signal handled by a VTR (NTSC system) In case of about 16.7m
The communication is performed in s), and the communication of eight words of W0, W1 ‥‥ W7 is performed every one field cycle. Note that data is transmitted according to the bit configuration of the area indicated by hatching in FIG.

When communication for editing is performed by connecting another VTR or an editing device, eight words W0 to W7 are used as shown in Table 1 below.

[0019]

[Table 1]

In Table 1, the user's own device is VTR1
This is the case where it is set to 0, and when the own device is a device other than the VTR (for example, a video camera), the corresponding code is used. As shown in Table 1, in the first two words (W0, W1), a status code indicating the type of the device from an external device (such as an editing device) connected to the bus line and a remote control code for operating the VTR 10 Is transmitted. And the following 6 words (W3 ~
In W7), transmission from the VTR 10 to the external device is performed, and a status code indicating the type of the VTR 10 and a VT
Peripheral status (such as channel) attached to R and V
TR operation mode (recording, playback, fast forward, rewind, etc.)
And data on the count value of the counter (hours, minutes,
Seconds, frames) are transmitted. With this configuration, various operation controls can be performed according to the remote control code from an external editing device or the like, and the counter data is transmitted from the VTR to the editing device. Can be performed, and editing in which editing points are specified in detail can be performed.

When the adjusting device 4 is connected to perform an adjusting operation, eight words W0 to W7 are used as shown in Table 2 below.

[0022]

[Table 2]

As shown in Table 2, in the first four words (W0 to W3), transmission is performed from the adjustment device side to the VTR 10 side, and the status indicates that the service mode indicates that adjustment is to be performed. The code is transmitted first.
Subsequently, a command code for sending a command for an operation to be executed on the VTR side such as memory rewriting, an address at which data is rewritten, and newly written data (in the case of memory rewriting) are transmitted. If the newly written data is larger than the capacity that can be transmitted by one word,
Cause transmission using multiple fields. Then, in the latter four words (W4 to W7), transmission from the VTR 10 to the adjustment device 4 is performed, a status code indicating the type of the VTR 10, a guide code indicating the operation status of the system controller of the VTR 10, and data. Is transmitted, and the read data (when the data read from the memory is instructed by the command code from the adjusting device side).

By composing the communication data for performing the adjustment work in this manner, a command for rewriting the VTR operation program stored in the memory 12 is sent by the command code from the adjustment device 4, and subsequently, By sending an address and data to be rewritten with the set word, the memory 12
Is rewritten to the data transmitted from the adjusting device 4. By rewriting the operating program in this manner, the system controller 11
Changes the control state of each circuit in the VTR,
Can be adjusted to a predetermined state. In this case, by reading the data written in the memory 12 by the command code from the adjusting device 4 and transmitting the read data to the adjusting device 4, the adjusted state (or the state before the adjustment) is adjusted. Can be determined.

As described above, according to the configuration of this embodiment, the VTR 1
By using a bus line used at the time of editing provided for the VTR 0, the operating program of the VTR can be modified at the time of service or the like and adjusted to a predetermined state. Therefore, it is not necessary to provide a dedicated bus line for adjustment, and the adjustment in the VTR can be easily performed with a simple configuration including only a single bus line, and the configuration of the bus line, the interface circuit, and the like is simplified. . In particular, there are many types of bus lines that can be connected to external devices and are capable of bidirectional communication, provided in VTRs. In such a case, the system controller 11 is operated so as to operate with service mode status data. All you have to do is set up and it's very easy to configure.

Even when the above adjustment is not performed, the operation status of the VTR 10 can be confirmed by outputting the data stored in the memory 12 in the VTR 10 according to a command from an external device. This is convenient for checking.

In the above-described embodiment, the present invention is applied to the internal adjustment of the VTR. However, the present invention can be applied to other video equipment such as a video camera. Applicable.

Further, the communication system performed via the bus line shown in the above-described embodiment is an example, and it is needless to say that various communication systems suitable for the applicable model may be selected. .

In the above-described embodiment, adjustment and the like are performed by rewriting data in a memory connected to a main system controller in a device (VTR). However, in an integrated circuit constituting each signal processing circuit. The program stored in the memory of the microcomputer may be directly rewritten.

Further, the present invention is not limited to the above-described embodiment, but may take various other configurations.

[0031]

According to the present invention, the state of each circuit in the electronic device can be known by the external device by using the control data communication line, and the operation program can be changed from the external device side. The adjustment can be performed, and it is not necessary to provide a dedicated bus line for the adjustment, and the configuration of a device that can be electronically adjusted from the outside can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a communication system according to one embodiment.

FIG. 3 is a configuration diagram illustrating an example of connection with an external device via a conventional bus line.

[Description of Signs] 4 Adjustment device 10 VTR 12 Memory 13 Recording / playback system circuit 14 Video processing system circuit 15 Servo control circuit 16 Motor drive control circuit

Continuation of the front page (72) Inventor Yukari Matsumura 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP-A-63-193629 (JP, A) JP-A-63-250703 (JP, A) JP-A-61-121551 (JP, A) JP-A-1-160158 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 27/00 H04L 11 / 00

Claims (1)

(57) [Claims] An electronic device having a terminal capable of communicating control data for instructing various operations bidirectionally with a single transmission line with an external device, wherein communication of a predetermined number of words is periodically performed. According to the mode control data transmitted in a specific word of the cycle obtained at the terminal, the bidirectional communication mode at the terminal receives various operation instructions of the electronic device and transmits various operation states. /> mode and, electronic apparatus characterized Waru switches <br/> to a mode for the reception and transmission of operation program of the microcomputer for controlling the electronic device.