JP2000036143A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the waste of electric power caused by forgetting to turn off power supply by controlling the on off of the power supply, changing the brightness when the power is turned on and setting an optimum power saving mode depending on the various operating conditions of a recording and reproducing device. SOLUTION: If a user does not operate an operating section 1 for a certain time while monitoring the video and the audio signals of a broadcasting program received by a TV tuner, a system control circuit 3 discriminates that the device is in an unoperated condition in a certain time based on the time information of a counter 2 and turns off the power supply of the magnetic recording and reproducing device. Besides the discrimination, if a video signal presence and absence detecting circuit 12 determines the fact that there exists no video signal at the end of a broadcasting or the end of a reproducing tape, the circuit 3 turns off the power supply of the device. The circuit 3 alerts that the power supply is turned off before the power supply is turned off during a video signal monitor operation or when a video signal is absent and displays a prescribed warning message prior to an automatic power supply turning off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and reproducing apparatus, for example, as in a television signal recording and reproducing apparatus.
The present invention relates to a recording / reproducing apparatus capable of supporting power saving during monitoring of a video signal and an audio signal of a broadcast program received by a TV tuner, and during recording and reproduction.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 8-149405 discloses a recording / reproducing apparatus capable of supporting power saving. With respect to specific information in a state where the backlight power of the display device is turned off, the backlight power of the liquid crystal display is turned on for a certain period of time to be displayed. Further, according to this conventional device, when it is not desired to view an image on a device equipped with a liquid crystal display device, a backlight power supply that consumes relatively large power is turned off to prevent useless consumption of a battery. It is stated that it is desired to do so.

[0003]

However, even if the backlight power is intentionally turned off by the user, the disclosed prior art does not provide any abnormality or specific information (eg, mechanism abnormality, battery exhaustion). , Information on the recording-prohibited tape) can be automatically displayed on the liquid crystal display.

However, in a VTR, there are different operation states such as monitoring of a video signal and an audio signal of a broadcast program received by a TV tuner, recording and reproduction, and reservation recording. Therefore, an object of the present invention is to automatically control the backlight power supply in order to obtain an optimal power saving mode for each operation state without intentionally turning off the backlight power supply, An object of the present invention is to enable the power of an electronic device to be turned off.

[0005]

In order to achieve the above object, the present invention comprises a system control circuit as a means for controlling the power supply of a backlight and the power supply of an electronic device. It is configured so that the optimal power saving mode can be set.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a cassette tape type magnetic recording / reproducing apparatus showing one embodiment of the present invention. FIG.
1 is an operation unit, 2 is a counter, 3 is a system control circuit, 4 is a display unit, 5 is a TV tuner,
6, 7, and 8 are video signal switching circuits, 9 is a video signal recording / playback processing circuit, 10 is a character signal addition circuit, 11 is a character signal generation circuit, 12 is a video signal presence / absence detection circuit, 13 is a blue-back generation circuit, 14 is an audio signal generation circuit, 15 is an audio output terminal, 16 is an external video signal input terminal, and 17 is a T
A V broadcast signal input terminal, 18 is a video signal output terminal, and 19 is a buzzer.

The operation unit 1 includes a power switch for instructing power on / off, a program selection switch for selecting a target broadcast program, a recording switch for instructing recording, a reproduction switch for instructing reproduction, and an instruction for stopping recording or reproduction. And a rewind switch for instructing rewinding of the tape (all not shown). These switches are provided independently and exclusively as needed, and are provided so as to be shared with other switches.

Next, an example of operation of the magnetic recording / reproducing apparatus will be described. When the power switch of the operation unit 1 is operated by the user to instruct power-on, the system control circuit 3 turns on the power of the magnetic recording / reproducing apparatus. Further, the system control circuit 3 operates to control the video signal switching circuit 6 to output the video signal from the TV tuner 5 to the video signal output terminal 18 via the character signal addition circuit 10. In this state, TV
If the user does not operate the operation unit 1 for a certain period of time while monitoring the video signal and the audio signal of the broadcast program received by the tuner, the system control circuit 3 sets the state of no operation for a certain period based on the time information of the counter 2. Then, the power of the magnetic recording / reproducing apparatus is turned off.

On the other hand, if the video signal presence / absence detection circuit 12 determines that there is no video signal at the end of the broadcast or at the end of the tape at the time of reproduction, the system control circuit 3 determines that there is no video signal from this information, Turn off the power of the recording / reproducing device.

FIG. 2 shows an OSD display for notifying a power-off warning before power-off during the above-described video signal monitor operation or when there is no video signal. This is to display a warning message for 10 seconds before the automatic power-off when the no-operation state continues for a certain period of time during the operation of the video signal monitor.

However, if there is any switch input during the display of the warning message, the counter 2 shown in FIG. Further, even if any switch input is detected during the counting of the no-operation time before this display appears, the counter 2 of FIG. 1 is initialized and the counter is operated again.

Incidentally, the input of the remote controller is also regarded as a switch input, and the counter 2 of FIG. 1 is operated to be initialized. Here, an example in which the information is displayed on the OSD is shown, but when a similar time is reached in the audio generation circuit 14 in FIG. 1, an announcement such as “turn off the power” is output to the audio output terminal 1.
5 or a buzzer 19 can be notified as a warning sound.

An embodiment of the present invention will be described with reference to FIG. Here, a power saving method during reproduction or recording will be described. FIG. 3 shows a specific example of the display unit 4 of FIG. 1, and is a block diagram of a circuit for changing the brightness of the display unit when the power is turned on. In FIG. 3, 20 is an LED, 21 is a lamp, 22 and 23 are switching circuits, 24 is a lamp switching control signal input terminal, 25 is an LED switching control signal input terminal, and 26 is a resistor. Here, the lamp and the LED are used for the backlight of the liquid crystal panel, and the lamp is brighter than the LED.

When the user operates the power switch of the operation unit 1 shown in FIG. 1 to give an instruction to turn on the power, the system control circuit 3 sends Hi to the lamp switching control signal input terminal 24 to turn on the lamp 21. . In this state, the LED switching control signal input terminal 25 is Lo, and the LED 20 is off. Next, when the user turns on the reproduction or recording (except for the reserved recording) switch of the operation unit 1, the counter 2 starts counting from that point on, and if no operation continues for a certain period of time, the system control is performed. The circuit determines that there is no operation during playback or recording, and sets the lamp switching control signal input terminal 24 to Lo, LE
The D switching control signal input terminal 25 is controlled to Hi to turn off the lamp 21 and turn on the LED 20.

Further, a lamp switching control signal input terminal 2
4 is Lo, LED switching control signal input terminal 25 is Hi
If any switch input is detected at the time, the lamp switching control signal input terminal 24 is set to Hi, the LED switching control signal input terminal 25 is set to Lo, the lamp 21 is turned on, and the LED 20 is turned off. The counter 2 of 1 is initialized and operated to perform re-counting.

Further, as an operation example, a case of scheduled recording will be described. When the scheduled recording is started, the user is often not at the place where the recording / reproducing device is located, so it is less necessary to notify the start of the recording. Therefore, in the case of the recording / recording operation state set by the timer recording means, the internal timer of the system control circuit determines that the current time is within the time range of the timer recording setting. The power can be saved by controlling the LED switching control signal input terminal 25 to Hi for power saving and operating the system control circuit to turn on the LED 20.

FIG. 4 is a flow chart of the automatic power-off function. The means for selecting the setting or canceling of the automatic power-off operation or the operation of changing the brightness of the display unit and the means for setting the time until the power is turned off will be described. . The user turns on the power switch of the operation unit 1 in FIG. 1 and the power is turned on (step 2). From this state, the OSD menu screen (step 3) is selected, and the automatic power-off function and the operation of changing the brightness of the display unit are determined to be used (step 4). Appears on the screen (step 5). If "Yes" is selected here, the counter is set to 2 hours (step 7). On the other hand, if "No" is selected, a screen (step 6) for setting the time until automatic power off to 6 hours appears on the OSD, and if "Yes" is selected, the counter is set to 6 hours. By doing so, the length of time until automatic power-off can be set arbitrarily.

[0019]

The present invention comprises means for controlling the power on / off and means for changing the display brightness when the power is turned on, so that the optimum power saving mode can be set according to each operation state of the recording / reproducing apparatus. In addition, it is possible to prevent power waste due to forgetting to turn off the power.

[Brief description of the drawings]

FIG. 1 is a block diagram of a cassette tape type magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an OSD display for notifying a power-off warning before power-off.

3 is a block diagram of a circuit that changes the brightness of the display unit when the power of the display unit 4 shown in FIG. 1 is turned on.

FIG. 4 is a flowchart showing a means for setting a time until automatic power-off.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operation part, 2 ... Counter, 3 ... System control circuit, 4 ... Display part, 5 ... TV tuner, 6,
7, 8: video signal switching circuit, 9: video signal recording
Reproduction processing circuit, 10 ... Character signal addition circuit, 11 ... Character signal generation circuit, 12 ... Video signal presence / absence detection circuit, 13 ...
Blue-back generation circuit, 14 ... audio signal generation circuit, 1
5 ... Audio output terminal, 16 ... External video signal input terminal, 1
7 TV broadcast signal input terminal, 18 Video signal output terminal, 19 Buzzer, 20 LED, 21 Lamp
Reference numerals 22, 23: switching circuit, 24: lamp switching control signal input terminal, 25: LED switching control signal input terminal, 26: resistor.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisashi Ota 1410 Inada, Hitachinaka-shi, Ibaraki Pref., Hitachi, Ltd. AV Division (72) Inventor Kazuhiro Watanabe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture In the system (72) Inventor Hiroto Yamauchi 1410 Inada, Hitachinaka-shi, Ibaraki Pref. Hitachi, Ltd. AV Business Unit (72) Inventor Toshiyuki Aoki 1410 Inada, Hitachinaka-shi, Ibaraki Pref. Hitachi, Ltd. AV Business Unit F-term (reference) 5D101 AD17 LA15 LA62 5D104 AD17 MH01 ML04

Claims (6)

[Claims] 1. A counter means for measuring time based on the time when a device control signal generated by operating a switch or the like of a device body and a device control signal transmitted from a remote control device of the device are input. And a means for controlling the power on / off of the device. In the case where the device control signal is not generated after the power is turned on and the no-operation state continues for a certain period of time, the output of the counter means causes the device to operate. A recording / reproducing apparatus characterized in that the power is controlled and the power is automatically turned off. 2. A television signal detection output of a tuner or an IF circuit and its video signal, a video signal from an external signal input circuit, a video signal reproduced from a recording medium, or each of the video signals. It is provided with video signal detecting means for detecting the presence or absence of a video signal selectively selected, and interlocks the output from the video signal detecting means with the counter means. When there is no video signal for a certain period of time, the power supply is automatically turned on. A recording / reproducing device which is turned off. 3. An OSD (on-screen display) means for adding a character signal to a video signal output, a guidance voice signal addition means for adding a guidance voice signal to an audio signal output, or a voice signal generating means. When a predetermined time before the automatic power-off operation is reached by the counter means, the power-off of the apparatus is displayed on a display unit of the apparatus or a screen of an externally connected device by an OSD, or a sound of the apparatus is generated. A recording / reproducing apparatus characterized in that sound is notified through means or an audio device of an externally connected device. 4. Counter means for measuring time based on a time when a device control signal generated by operating a switch or the like of a device body and a device control signal transmitted from a remote control device of the device are input. And a display unit for displaying ancillary status such as the status of the device and the time according to the device control signal, and a display brightness adjusting means for controlling the brightness of the display unit. A recording / reproducing apparatus which controls the display section brightness adjusting means based on the output of the counter means to automatically change the brightness of the display section when there is no signal and the no-operation state is continued. 5. A recording / reproducing apparatus provided with a timer recording means, wherein an apparatus control signal generated by operating an operation section such as a switch of the apparatus body and a state of the apparatus based on an apparatus control signal transmitted from a remote control apparatus of the apparatus. A display unit for displaying incidental conditions such as time and time, a timer unit, and a display unit brightness adjustment unit for controlling the brightness of the display unit. A recording / reproducing apparatus, characterized in that timer means determines that the time is within a time range of a preset recording setting, and controls the display section brightness adjusting means to automatically change the brightness of the display section. 6. The operation setting means according to claim 1, wherein the selection of setting or canceling the operation of the automatic power-off and the operation of changing the brightness of the display unit and the operation time of the automatic power-off are set. A recording / reproducing apparatus characterized by comprising: