JP3424311B2 - Electronics - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic apparatus suitable for application to, for example, a video tape recorder or a cassette deck. [0002] Conventionally, when a plurality of electronic devices are connected and used, for example, when a video tape recorder or the like is connected to a television, an operation switch of each device or each device is used. It is common practice to individually operate remote controllers corresponding to. Further, there is known a remote control device having a learning function of storing transmission codes of different remote control devices and outputting transmission codes of different remote control devices in accordance with an operation. [0003] As described above, when a plurality of electronic devices are connected and used, the operation of each operation switch is very complicated. Also,
Even when using a remote control device with a learning function,
It is necessary to store the transmission code of the remote control device corresponding to each device, and to operate each device, it is necessary to repeatedly operate the operation key of the remote control device corresponding to the operation switch of the device. Was not. When a plurality of devices are to be controlled in association with each other in order to reduce the key operations of the operation switches and the remote controller, communication is performed by providing a communication path between the devices and using a unified communication method. It is necessary and cannot be easily implemented. In view of the above, the present invention provides an electronic device which can control a plurality of devices in association with each other without providing a new communication path. An electronic device according to the present invention comprises a signal output unit, a reference signal generation unit for generating a reference signal, a signal output from the signal output unit, and a reference signal generation unit. A signal switching means for selectively switching a reference signal to be output and supplying the signal to a signal output terminal; a signal detection means for detecting whether a reference signal is input to a signal input terminal; and a detection output of the signal detection means. Control means for controlling the operation of the signal output means and the signal switching means on the basis of the signal output means and the reference signal output by the reference signal generation means is selected by the signal switching means. When the signal detection means detects that the reference signal is being input to the signal input terminal, the control means sets the signal output means to an operating state and the signal switching means The signal output from the output means is selected. In the present invention, when selected by another electronic device connected via the signal output terminal and the signal input terminal, the reference signal output from the signal output terminal is:
It is supplied to a signal input terminal via another electronic device. When the supplied reference signal is detected by the signal detection means, the signal output means is brought into the operating state by the control means, and the signal from the signal output means is selected by the signal switching means and output from the signal output terminal. Is done. Therefore, it is possible to automatically control the operation state in relation to the switch operation of the externally connected electronic device without operating the operation switch of the electronic device. A first embodiment of an electronic apparatus according to the present invention will be described below with reference to FIG. In this embodiment, one video tape recorder is connected to one television, and the operation of the video tape recorder is controlled in relation to the operation of the television. In FIG. 1, reference numeral 1 denotes a video tape recorder. A reproduction signal processing section 2 of the video tape recorder 1 is supplied with a reproduction signal of a magnetic tape read by a reproduction head (not shown). This reproduction signal is converted into a video signal VP by the reproduction signal processing unit 2 and supplied to the terminal b of the signal switch 7. Reference numeral 3 denotes a signal generator. This signal generator 3
Then, for example, a video signal VS is generated. This video signal VS is supplied to a terminal a of the signal switch 7 and
It is supplied to the detection unit 4. The switching of the signal switch 7 is controlled by a microcomputer (hereinafter referred to as "microcomputer") 6, which will be described later. The video signal VS supplied to the terminal a of the signal switch 7 or the video signal VP supplied to the terminal b
Is selected and supplied to the video output terminal 8. A video input terminal 9 to which a video signal VE from the outside is input is connected to the detection unit 4 and to the recording signal processing unit 5. The detector 4 compares the phase of the vertical or horizontal synchronizing signal between the video signal VS supplied from the signal generator 3 and the video signal VE supplied from the video input terminal 9. The result of this phase comparison is supplied to the microcomputer 6. Further, in the detection unit 4, the video signal VE is input to the video input terminal 9.
Is detected, and the detection result is supplied to the microcomputer 6. The microcomputer 6 controls the switching operation of the signal switch 7 and also controls the power supply and operation of the reproduction signal processing unit 2, the recording signal processing unit 5, and a mechanism control unit (not shown). Further, the recording signal processing unit 5 performs a signal conversion process so that the video signal VE input from the video input terminal 9 can be recorded on a magnetic tape by a recording head (not shown). Although not shown, the signal generating unit 3, the detecting unit 4, the microcomputer 6, and the signal switching unit 7 are different from the reproducing signal processing unit 2, the recording signal processing unit 5, the mechanism control unit (not shown) and the like. Power is supplied from different power systems. Therefore, power is supplied to the reproduction signal processing unit 2, the recording signal processing unit 5, the mechanism control unit, and the like only when the power switch is turned on, and the signal generation unit 3, the detection unit 4, the microcomputer 6, and the signal switching unit 7, power is supplied not only when the power switch is turned on but also when the power switch is turned off (so-called standby state). Reference numeral 11 denotes a television. The television 11 has two video input terminals 12 and 13 and one video output terminal 14. The video output terminal 8 and the video input terminal 9 of the video tape recorder 1 are connected to the video input terminal 12 and the video output terminal 14, respectively. The two video input terminals 12 and 13 of the television 11 are connected to the terminals d and e of the signal switch 16, respectively. The tuner 15 is connected to a terminal c of the signal switch 16 to supply a video signal VT obtained by processing a television reception signal. The signal switch 16 includes a tuner 15
And a video signal VT supplied from the video tape recorder 1 to the video input terminal 12.
One of S or the video signal VP and the video signal supplied to the video input terminal 13 is selected. The switching control of the signal switch 16 is performed by control means (not shown) in relation to the operation switches of the television 11. The video signal selected by the signal switch 16 is supplied to an image processing unit 18 and to a video output terminal 14 via a buffer amplifier 17. In the image processing section 18, the synchronization signal is separated, subjected to color signal processing, and the like, and displayed on a television screen (not shown). This embodiment is configured as described above. Hereinafter, the control operation of the power supply will be described with reference to the flowchart of FIG. When the power supply to the video tape recorder 1 is started and the video tape recorder 1 is set in the standby state, the signal switch 7 is turned on by the control signal CS from the microcomputer 6 in step ST1.
Side is selected and the process proceeds to step ST2. In step ST2, since the video tape recorder 1 is in the standby state, the video signal VS is generated from the signal generator 3, and the process proceeds to step ST3. The video signal VS is supplied to the terminal d of the signal switch 16 of the television 11 via the video output terminal 8 and the video input terminal 11. In step ST3, the result of the phase comparison between the video signal VS and the video signal VE supplied to the detection unit 4 is determined. For example, when the television mode (the television reception signal is displayed on the screen) is selected by the operation switch of the television 11, the signal switch 16 is set to the c side, and the video signal VT from the tuner unit 15 is selected. This video signal VT is supplied to a buffer amplifier 17, a video output terminal 14,
It is supplied to the detection unit 4 via the video input terminal 9. The detector 4 compares the phase of the synchronizing signal between the video signal VS and the video signal VE (= VT). However, since the signals are different, the phases are different, and the process returns to step ST3 to continue the phase comparison. Here, when the first video mode (the video signal input to the video input terminal 12 is displayed on the screen) is selected by the operation switch of the television 11, the signal switch 16 is set to the d side and the video input is performed. The video signal VS input to the terminal 12 is selected. The video signal VS is supplied to the detection unit 4 via the buffer amplifier 17, the video output terminal 14, and the video input terminal 9 of the video tape recorder 1.
Supplied to The detection unit 4 compares the phase of the synchronization signal between the video signal VS and the video signal VE (= VS). Since the signals are the same and have substantially the same phase, the process proceeds to step ST4. When the second video mode (the video signal input to the video input terminal 12 is displayed on the screen) is selected by the operation switch of the television 11, the signal switch 16 is set to the e side. Since no signal is supplied to the input terminal 13, no signal is output from the video output terminal 14. Therefore, the detecting unit 4 determines that the phases are different, and returns to step ST3. In step ST4, the signal switch 7 selects the b side by the control signal CS of the detector 4, and the process proceeds to step ST5. After the power switch of the video tape recorder 1 is turned on in step ST5,
Proceed to 6. At this time, the video signal VP obtained by reproducing the magnetic tape is supplied to the video output terminal 8 and the video input terminal 12.
Is supplied to the signal switch 16 via the. Since the signal switch 16 is on the d side, the video signal VP is supplied to the image processing section 8 and displayed on the screen. Next, in step ST6, it is determined whether or not the video signal VE is supplied to the detecting section 4. Television image and video tape recorder 1 on television 11
Is displayed, the video signal VE is supplied to the detection unit 4. Therefore, the process returns to step ST6, and it is determined whether the video signal VE is continuously supplied to the detection unit 4. When the video signal VE is not supplied to the detection unit 4 for a predetermined time, for example, when the power switch of the television 11 is turned off and no signal is output from the buffer amplifier 17, the video signal VE is supplied to the detection unit 4.
Is not supplied, the process proceeds to step ST7. In step 7, a signal indicating that the video signal VE is not supplied to the detection unit 4 is sent to the microcomputer 6
The power switch of the video tape recorder 1 is turned off by the microcomputer 6. If the power supply to the video tape recorder 1 is not stopped, the process may proceed to step ST1 and continue the control operation. By the way, when the video signal VE is not supplied to the detecting unit 4 for a predetermined time in step ST6, the power switch of the video tape recorder 1 is controlled in step ST7. It is not limited to switches. For example, when the tuner is selected on the television 11 and the video signal VE is not supplied to the detection unit 4 for a predetermined time, the reproduction operation of the video tape recorder 1 is stopped to be in a standby state, and the process proceeds to step ST1 again. It may be. When the first video mode is selected on the television 11, the playback operation of the video tape recorder 1 is started. As described above, according to the present embodiment, when the first video mode is selected by operating the operation switch of the television 11 connected to the video tape recorder 1, the switch of the video tape recorder 1 is operated. It can be automatically turned on without any operation. Furthermore, by turning off the power supply of the television 11 or selecting another signal, the operation state can be canceled without operating the switch of the video tape recorder 1. Next, a description will be given of a second embodiment of the electronic apparatus according to the present invention. In this embodiment, one cassette deck is connected to one audio amplifier, and the cassette deck is controlled in relation to the operation of the audio amplifier. The configuration is shown in FIG. In FIG. 3, reference numeral 21 denotes a cassette deck. During reproduction, an audio signal SP is output from the reproduction signal processing section 22 of the cassette deck 21 and supplied to the terminal b of the signal switch 27. From the signal generator 23, for example, a rectangular wave signal SS is supplied to the terminal a of the signal switch 27 and also to the detector 24. In the signal switch 27, one of the rectangular wave signal SS supplied to the terminal a and the audio signal SP supplied to the terminal b is selected and supplied to the audio output terminal 28. Also, an external audio signal S
E is supplied to the audio input terminal 29. In the present embodiment, the detection section 24 compares the phase of the rectangular wave signal SS supplied from the signal generation section 23 with the audio signal SE supplied from the audio input terminal 29. Reference numeral 31 denotes an audio amplifier. The audio amplifier 31 has three audio input terminals 32, 3
3 and 34 and one audio output terminal 35. The audio output terminal 28 and the audio input terminal 29 of the cassette deck 21 are connected to the audio input terminal 32 and the audio output terminal 35, respectively. The three audio input terminals 32, 33, 34 of the audio amplifier 31 are connected to a signal switch 36, respectively.
Are connected to the terminals c, d, and e. In the signal switch 36, the audio signal SS or audio signal SP selected by the signal switch 27 of the cassette deck 21 and supplied to the audio input terminal 32, and the audio signal supplied from the audio input terminals 33 and 34 One of the signals is selected. In addition,
Switching of the signal switch 36 is controlled by the audio amplifier 3.
This is performed by control means (not shown) in association with one operation switch. The audio signal selected by the signal switch 36 is supplied to an audio output terminal 35 and an amplifier processing section 37.
And amplified by the amplifier processing unit 37.
The reproduced sound is output from a speaker (not shown). Although the control operation of the second embodiment is not described, the control operation is performed in the same manner as in the first embodiment. For this reason, the operation switch of the audio amplifier 31 connected to the cassette deck 21
Is selected, the cassette deck 21 can be turned on without operating the power switch. Further, by turning off the power switch of the audio amplifier 31, the power can be turned off without operating the power switch of the cassette deck 21. Further, not only the power switch but also a reproducing operation may be controlled. In the first and second embodiments, the case where one video tape recorder or cassette deck is connected to the television 11 and the audio amplifier 31 has been described. Of course, the present invention can be applied even if a plurality of video tape recorders or cassette decks are connected according to the number of input terminals. The electronic devices that can be connected are not limited to video tape recorders, but may be video devices such as video disk players. Similarly, an audio device such as a compact disc player as well as a cassette deck may be used. A switch is provided in the signal generators 3 and 23 of the video tape recorder or the cassette deck or in the communication line of the control signal CS, and a control operation is performed as required by switching the switch. It may be. According to the present invention, when selected by another electronic device connected via the signal output terminal and the signal input terminal, the reference signal output from the signal output terminal is changed to another reference signal. It is supplied to the signal input terminal via the electronic device.
When the supplied reference signal is detected by the signal detection means, the signal output means is brought into the operating state by the control means, and the signal from the signal output means is selected by the signal switching means and output from the signal output terminal. Is done. Therefore, the operation can be automatically controlled in relation to the switch operation of the externally connected electronic device without operating the operation switch of the electronic device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of a first embodiment of an electronic apparatus according to the present invention. FIG. 2 is a flowchart illustrating a control operation according to the first embodiment. FIG. 3 is a diagram showing a configuration of a second embodiment of the electronic apparatus according to the present invention. [Description of Signs] 1 Video tape recorder 3, 23 Signal generator 4, 24 Detector 6, 26 Microcomputer 7, 27 Signal switch 11 Television 15 Tuner unit 16, 36 Signal switch 21 Cassette deck 31 Audio amplifier

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 31/00 541 H04Q 9/00 301

Claims (1)

(57) Claims 1. Signal output means, reference signal generation means for generating a reference signal, a signal output from the signal output means, and a reference output from the reference signal generation means Signal switching means for selectively switching a signal and supplying the signal to a signal output terminal; signal detection means for detecting whether or not the reference signal is input to a signal input terminal; and a detection output of the signal detection means. Signal output means and control means for controlling the operation of the signal switching means, wherein the signal output means is in an inactive state, and the signal switching means selects a reference signal output by the reference signal generation means. When the signal detection means detects that the reference signal is being input to the signal input terminal in a state in which the signal output means is in the ON state, the control means sets the signal output means to the operating state. An electronic apparatus, characterized by a state signal output from said signal output means by the signal switching means is selected.