JPH04113771A - Picture reproduction device - Google Patents

Abstract

PURPOSE:To attain power application and interruption automatically in response to the presence of a reception picture data by detecting reception of a picture data signal so as to apply power to each section of the device and interrupting power to each of the device when the state of absence of the picture data reception is detected for a prescribed time. CONSTITUTION:A power supply control section 15 consists of a reception signal detection section 7, an electric control switch 8 and a timer 9. Upon the receipt of a synchronizing signal, the synchronizing signal is outputted from a signal distribution section 13 of a reception section 2 to a reception signal detection section 7. The reception signal detection section 7 detects it to turn on the electric control switch 8. Thus, a picture data is displayed on a CRT 14 of a monitor section. When the end of reception of a picture data signal is confirmed, the timer 9 is set to start time monitor. Even when a prescribed time elapses and a synchronizing signal ahead the picture data signal is not detected, the reception signal detection section 7 turns off the electric control switch 8 to interrupt power supply to sections 3-6 of the device. Thus, forgetting of power supply interruption by manual operation is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image reproducing device, and particularly to an image reproducing device that receives and reproduces communication of image data, for example.

[Prior Art] Conventionally, in an image reproducing apparatus that receives and reproduces still image data as shown in FIG. 4, when the power switch is turned off,
The power supply to all parts of the device was cut off, and the entire device stopped operating completely. Therefore, it is necessary for an operator at the location where the device is installed to turn on and off the power switch when starting and ending use of the device.

[Problems to be Solved by the Invention] However, the conventional example described above has the following drawbacks because a person is involved in turning on and off the power.

(1) It is necessary to turn on the power switch for each device before communication and broadcasting of still image data starts, and to turn it off at the end, which is time-consuming.

(2) There is a possibility of forgetting to turn on and off the power switch due to human error. In particular, if the user forgets to turn off the device and leaves the device powered on for a long time, the device may overheat and become dangerous.

The present invention has been made in view of the above conventional example, and an object of the present invention is to provide an image reproducing device that can automatically turn on and off the power depending on the presence or absence of received image data.

[Means for Solving the Problems] In order to achieve the above object, an image reproducing device of the present invention has the following configuration. That is, a power supply unit that supplies power, a receiving unit that receives the image data signal, a reproducing unit that reproduces an image based on the image data signal received by the receiving unit, and a detecting unit that detects reception of the image data. and a control means for controlling supply of power from the power supply unit to the reproduction means.

[Function] With the above configuration, the present invention turns on power to each part of the apparatus by detecting reception of an image data signal, and supplies power to each part of the apparatus by detecting a state in which no image data signal is received for a predetermined period of time. works to cut.

[Embodiments] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of an image reproducing apparatus that is a typical embodiment of the present invention. In FIG. 1, 1 is a power supply unit, 2 is a receiving unit that receives digital still image information input from a communication/broadcasting line, 3 is a decoder that develops the received still image information into a bitmap image, and 4 is a bitmap image. A frame memory that stores still image information of an image, 5 a D/A converter that converts the digital still image information read out from the frame memory 4 at a video signal rate into an analog signal, and 6 a D/A converter 5 that converts the digital still image information into an analog signal. A monitor unit that displays the video signal converted into a signal, 7 a received signal detection unit that constantly monitors the presence or absence of image data input from the communication line, and 8 a power supply for 3 to 6 according to instructions from the reception signal detection unit 7. An electricity charge switch for controlling on and off, 9 a timer for time monitoring, and 14 a CRT for displaying images connected to a monitor unit.

The receiving unit 2 also includes a receiver 10 that receives image data;
It is composed of a bit synchronizer (BS) 11, a frame synchronizer (FS), and a signal distribution section 13 that outputs image data to the received signal detection section 7 and the decoder section 3. Then, a received signal detection section 7, an electric control switch 8
and timer 9 constitute a power supply control section 15.

In an image reproducing device having such a configuration, how the power supply control unit 15 turns on and off power to each part of the device is shown in the time chart of injury image data shown in FIG. 2 and in FIG. 3. This will be explained using the flowchart of the power on/off process shown in FIG. Note that in this embodiment, it is assumed that the image data received is still image data.

Further, it is assumed that power is constantly supplied to the receiving section 2 and the received signal detecting section 7. Furthermore, the received image data signal includes a synchronization signal for a certain period of time (T) prior to the image data.
, ), shall be added.

First, in step S10, the image reproducing device is in a state of waiting to receive an image data signal, only the receiving section 2 and the received signal detecting section 7 of the device are activated, the electric control switch 8 is in the off state, and other devices of the device All parts 3 to 6 have stopped operating. At this time, the line is in the state shown at 100 in FIG. 2, and is in a no-signal state. In the following step S15, it is checked whether a synchronization signal has been detected. If no synchronization signal is detected, the process returns to step S10 and continues monitoring while waiting for image data signal reception.

On the other hand, a synchronization signal (
Time T. -T, ) is received, the synchronization signal is output from the signal distribution section 13 of the reception section 2 to the received signal detection section 7. The received signal detection unit 7 detects this, and the process proceeds to step S20. In step S20, a control signal is sent from the received signal detection section 7 to the electric control switch 8 to turn on the switch. As a result, in step S30, the decoder section 3, frame memory 4, D/A converter 5, and monitor section 6 are powered on, image data as shown at 102 in FIG. 2 is received, and the monitor section CRT14
The image data will be displayed.

Next, in step S30, when it is confirmed that the reception of the image data signal has ended (time T), in step S35, the timer 9 is turned on to monitor the reception of the next image data, and time monitoring is started.

Here, in step S40, after the start of time monitoring, reception of the image data signal ends for a certain period of time (T, for example, about several minutes), even if a no-signal state continues as shown at 103 in FIG. However, the power supply control section 15 keeps the electrical control switch in the on state. Here, this certain period of time (Ts
) shall be set to be sufficiently longer than each still image data interval to be transmitted.Then, as shown by 104 in FIG. If so (in this case, the synchronization signal is detected at time T3 before reaching time T2+T), the next image data as shown at 105 in FIG. 2 is received in step S45.Subsequently, step In step S50, the timer 9 for time monitoring is reset, and in step S55, the end of reception of the image data signal (time T5) is confirmed, and the process returns to step S35 to start time monitoring for receiving the next image data. enter.

On the other hand, as shown by 106 in FIG.
Ts) has elapsed, and time T6 (= time T s + T s
), if the synchronization signal preceding the image data signal is not detected, the process proceeds to step S60, and the received signal detection unit 7 issues a control signal to turn off the electric control switch 8. In response to this, in step S65, the electric control switch 8 is turned off, cutting off the power supply to each part 3 to 6 of the apparatus. Subsequently, in step S70, it is determined whether or not to continue monitoring reception of image data. If reception monitoring is to be continued, the process returns to step SIO; otherwise, reception monitoring is ended.

As described above, in this embodiment, the synchronization signal preceding the image data signal is detected, and after the image data signal is received,
The power supply to each part of the device is controlled by monitoring for a certain period of time.

Therefore, according to this embodiment, power can be turned on to each part of the apparatus by detecting reception of image data, and power supply to each part of the apparatus can be cut off by detecting that no image data has been received for a certain period of time. can.

In this embodiment, a device for receiving still image data has been described, but the present invention is not limited thereto. For example, the present invention can also be applied to the case of receiving moving image data.

[Effects of the Invention] As described above, according to the present invention, there is an effect that the power can be turned on and off automatically according to the presence or absence of received image data. Therefore, there is no need to forget to turn off the power by manual operation, which has the advantage of improving the safety of the device and reducing power consumption of the device.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an image reproducing device that is a typical embodiment of the present invention, Fig. 2 is a diagram showing a time chart of received image data signals, and Fig. 3 is a flowchart showing power on/off processing. , and FIG. 4 is a block diagram of a conventional still image reproducing device. In the figure, 1... power supply section, 2... receiving section, 3... decoder section, 4... frame memory, 5... D/A converter, 6... monitor section, 7...・Received signal detection section,
8... Electric control switch, 9... Timer, 1o...
・Receiver, 11...BS (bit synchronizer)
, 12...FS (frame synchronizer), 13.
. . . signal distribution section, 14 . . CRT, ] 5 . . . power supply control section. Patent applicant Canon Co., Ltd.

Claims (1)

[Scope of Claims] A power supply unit that supplies power; a receiving unit that receives the image data signal; a reproducing unit that reproduces an image based on the image data signal received by the receiving unit; An image reproducing device comprising: control means for controlling the supply of power from the power supply section to the reproducing means by detecting reception of data.