JP3767076B2 - Electronics - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic apparatus having a function of operating in a power saving mode for reducing power consumption.
[0002]
[Prior art]
DAT (Digital Audio Tape Recorder) and other recording / playback devices, especially a battery-powered recording / playback device, and a mechanical controller that controls the mechanical mechanism of the device to avoid battery drain when the device functions are not used for a certain period of time In addition, the operation clock of the system controller that controls the entire apparatus including the mechanical controller is switched from the normal mode to the low speed mode. For example, in a portable DAT, if no operation is performed for a certain period of time after the stop button is pressed, the system controller turns off the mechanical controller and changes its system clock from 4.19 MHz in normal mode to 32 kHz in low speed mode. To reduce battery consumption. In this low speed mode, the device does not perform anything other than changing the clock display once per second, so to speak, this mode is called a sleep mode. If any button or key on the device is pressed while in the sleep mode, the device switches to the normal mode in response.
[0003]
In order to enhance the power saving effect, a hold button is provided to lock the device to the sleep mode. When this button is set to the hold position, pressing the other key switches to the normal mode and the device is displayed on the display device. There is a display that indicates that it is currently held in the sleep mode and enters the sleep mode again. For example, when the device is being carried in a bag or the like, this hold button prevents the device from entering the normal mode and consuming the battery against the user's intention when the corner of the book touches the device operation keys. It is to prevent.
[0004]
[Problems to be solved by the invention]
In such a conventional device, even when the device is held in the sleep mode, for example, if the corner of the book keeps touching the operation key of the device, the normal mode remains, and the sleep mode cannot be entered. In addition, even when the corner of a book touches the operation keys of the device intermittently due to the vibration of the bag and does not give a margin for shifting to the sleep mode, the effect of being held in the sleep mode and being kept in the normal mode is reduced. There was a problem that.
[0005]
Therefore, an object of the present invention is to improve the effect of the power saving mode of the electronic device.
[0006]
[Means for Solving the Problems]
The object of the present invention is to control the operation clock of the system controller to the low speed mode in the switching means for switching the operation clock of the system controller between the low speed mode and the high speed mode, and the mode for prohibiting the control according to the operation of the operation means, A control means for controlling the switching means so that when the operation means is operated in the low speed mode, the low speed mode is once switched from the low speed mode to the low speed mode after a predetermined time has elapsed, and the operation time of the operation means is provided. Regardless of the problem, the electronic apparatus automatically switches from the high speed mode to the low speed mode.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1. DAT
Hereinafter, an embodiment of the present invention will be described by taking a DAT (Digital Audio Tape Recorder) as an example. As shown in FIG. 1, the DAT includes a cassette holder 2 rotatably attached to the tape recorder main body 1, and the tape cassette 3 is attached to the tape recorder main body 1 by inserting the tape cassette 3 into the cassette holder 2. Is done. The main body 1 is provided with a liquid crystal display unit 30 for displaying a calendar, and during reproduction, a program number is displayed in addition to the calendar.
[0008]
The main body 1 is provided with operation buttons such as a rewind button 15, a stop button 13, a playback button 11, a fast-forward button 14, and a recording (recording) button 12. A slide-type hold button 16 is provided on the side surface. When the hold button 16 is slid to the hold position, the device is held in the sleep mode.
[0009]
For the sake of convenience of explanation, the display unit 30, various operation buttons, and the cassette loading / unloading cover are shown as being on the same surface of the main body 1. However, these are arranged according to the operability of the product and the design from the aesthetic point of view. May be. A cassette loading / unloading port is provided on the back surface of the main body, and various operation buttons can be largely arranged on the main surface. The main unit 1 is provided with a volume control button or knob, a calendar setting key, an eject button for opening the cassette cover, etc. in addition to those shown in the figure, a recording microphone, a playback speaker, a line input terminal, and a line output. There is also a terminal.
[0010]
Please refer to FIG. When the tape cassette 3 is mounted, the tape loading mechanism provided in the tape recorder main body 1 starts to operate, and the magnetic tape 6 is loaded onto a predetermined tape traveling path along the head cylinder 7 having a rotating magnetic head. The magnetic tape 6 is driven by a capstan 8 and a pinch roller 9 as shown in FIG. The head cylinder 7 and the capstan 8 are driven by a cylinder motor M1 and a capstan motor M2, respectively.
[0011]
An audio signal from a microphone (not shown) or line input is input to the analog block 21 to be amplified, sampled by the A / D converter 22a of the A / D and D / A block 22, quantized, and digitized. Then, the signal processing block 23 is entered. The signal processing block 23 interleaves this digital signal with the interleaving unit 23a, adds an error correction code with the code generation unit 23b, and performs 8-10 conversion with the 8-10 conversion unit 23c. The digital signal processed in this way is converted into a head driving current by the recording amplifier 24a of the electromagnetic conversion block 24, and is recorded on the magnetic tape 6 via the recording / reproducing switch 24b.
[0012]
At the time of reproduction operation, the audio signal from the magnetic tape 6 is sent to the reproduction amplifier 24c via the recording / playback switch 24b of the electromagnetic conversion block 24 and amplified, and is shaped by waveform equalization by the equivalent shaping unit 24d. Data extraction is performed. This data is sent to the signal processing block 23, where the operation opposite to that at the time of recording is performed. That is, the data is 10-8 converted by the 10-8 converter 23f, subjected to error correction by the error corrector 23e, and then deinterleaved by the deinterleaver 23d. The digital data thus obtained is sent to the D / A converter 22b, converted into an analog reproduction output, amplified, and a speaker (not shown) is sounded.
[0013]
The system controller 25 includes a play operation button 11, a recording operation button 12, a stop operation button 13, a fast-forward operation button 14, a rewind operation button 15, and other operation buttons provided in the key input unit 10 for selecting the DAT operation mode. Alternatively, an operation signal from the key is received, and a control signal corresponding to the operation mode is sent to the mechanical controller 26. Although only a limited key or button is shown as the key input unit 10 in FIG. 3, many other operation keys such as a volume control key and a calendar setting key are also included in the key input unit 10 as described above. The mechanical controller 26 controls the servo block 27 while communicating with the system controller 25. That is, the mechanical controller 26 controls the mechanical mechanism of the apparatus.
[0014]
The tracking servo during reproduction uses an ATF (Automatic Track Finding) system and is controlled by the ATF unit 27a. The magnetic tape 6 is provided with an ATF area, and when the reproducing head of the head cylinder 7 passes through the ATF area, an error between the reproducing head and a track to be traced (home track) is detected. Briefly, the second frequency signal (pilot signal) of the adjacent track is sampled and held on the basis of the first frequency signal (synchronization signal) recorded in the ATF area on the home track, and the head and the home track. The relative position is detected and the difference is controlled to be zero. Based on the ATF signal, the capstan drive 27b of the servo block 27 controls the rotation of the capstan motor M2. A cylinder motor M 1 that rotates the head cylinder 7 is driven by a cylinder drive 27 c of the servo block 27.
[0015]
2. Mode switching FIG. 3 shows the structure of a DAT to which the present invention is applied. In FIG. 3, the system controller 25 controls the entire apparatus, and includes a control unit 61 that controls each apparatus and a switching circuit 63 that switches the first and second oscillation sources 67 and 68.
[0016]
The control unit 61 includes a timer 62 that measures the timing for switching the oscillation source, and displays a switching circuit 63, a key input unit 10 operated by a user, a hold button 16 for maintaining a sleep mode state, time, control information, and the like. The system is connected to a control target system 70 including a liquid crystal display unit 30, a signal processing block 23, a mechanical controller 26, and the like.
[0017]
The switching circuit 63 is connected to a first oscillation source 67 and a second oscillation source 68 having different clock frequencies, and one of the first or second oscillation sources 67 and 68 is selected according to a signal from the control unit 61. Is selectively connected to the control unit 61. The first oscillation source 67 generates a clock for operating the control unit 61 of the system controller 25 in the normal mode, and the clock frequency is 4.19 MHz. The second oscillation source 68 generates a clock for operating the control unit 61 of the system controller 25 in the low speed mode, that is, the sleep mode, and the clock frequency is 32 kHz.
[0018]
Switching between the two oscillation sources 67 and 68 will be described. Now, it is assumed that the control unit 61 is connected to the first oscillation source 67 operating in the normal mode. When the stop key of the key input unit 10 is pressed, an input signal is sent from the key input unit 10 to the control unit 61. When receiving the input signal, the control unit 61 performs control according to the input signal (stop of the tape) and sets the timer 62 to, for example, 3 minutes. If there is no key input for 3 minutes, a signal from the timer 62 is received after 3 minutes, and the control unit 61 controls the switching circuit 63 to switch the connection from the first oscillation source 67 to the second oscillation source 68. To enter sleep mode. At this time, the power supply of the mechanical controller 26 is completely turned off.
[0019]
In the sleep mode, if there is any key input, the control unit 61 controls the switching circuit 63 according to the input signal from the key input unit 7 in order to perform processing according to the input key. Then, switching from the second oscillation source 68 to the first oscillation source 67, that is, switching from the sleep mode to the normal mode is performed. At the same time, the power supply of the mechanical controller 26 is turned on.
[0020]
When the hold button 16 is set to the hold position, a hold signal is sent from the hold button 16 to the control unit 61. In response to the hold signal, the control unit 61 controls the switching circuit 63 to switch the connection from the first oscillation source 67 to the second oscillation source 68 and shift from the normal mode to the sleep mode. At the same time, the power source of the mechanical controller 26 is turned off. After the hold button 16 is set, the control unit 61 controls the switching circuit 63 so as to maintain the sleep mode.
[0021]
3. Hold Control FIG. 4 is a timing chart showing mode switching when there is a key input in the hold state. FIG. 4A shows the conventional mode switching timing. Conventionally, when there is any key input in the hold state, the control unit 61 controls the switching circuit 63 to switch from the first oscillation source 67 to the second oscillation source 68, that is, from the sleep mode to the normal state. Switch to mode. After switching to the normal mode, the control unit 61 performs “hold” display on the display element 8. As a result, the user knows that DAT is in the hold state.
[0022]
At the stage where the input signal is interrupted (the end of the time indicated by A in FIG. 4A), the control unit 61 sets a predetermined time t (for example, 15 seconds) in the timer 62. The control unit 61 measures the time with the timer 62 and controls the switching circuit 63 after the elapse of time t to switch from the second oscillation source 68 to the first oscillation source 67, that is, from the normal mode to the sleep mode. Is switched. Therefore, the operation time in the normal mode is a time obtained by adding the time t to the time A.
[0023]
When the user sets the portable DAT in the hold state and moves in the bag, if the corner of a book intermittently touches the operation key of the key input unit 7 of the DAT due to the vibration of the bag, the degree of contact The “hold” display is performed on the liquid crystal display unit 30. Further, each time the contact is made, the control unit 61 sets a predetermined time t in the timer 62 in response to the falling part of the input signal due to the contact, and measures the time. Therefore, if the time interval of intermittent contact is shorter than the set time t, the normal mode is maintained while the contact is repeated (time indicated by B in FIG. 4A). After a lapse of time t from the stage where the intermittent repeated input signal is interrupted (the end of the time indicated by B in FIG. 4A), the control unit 61 controls the switching circuit 63 to control the first oscillation source 67. To the second oscillation source 68, that is, switching from the normal mode to the sleep mode. Accordingly, the operation time in the normal mode is a time obtained by adding the time t to the time B.
[0024]
FIG. 4B shows the mode switching timing of the present invention. In the present invention, when there is any key input in the hold state, the control unit 61 performs “hold” display on the display element 8 after switching to the normal mode, as in the conventional case. At the same time, the control unit 61 sets a predetermined time T (for example, 15 seconds) in the timer 62 at the stage of receiving the input signal (the start portion of the time indicated by A in FIG. 4B). Thereafter, the control unit 61 performs time measurement with the timer 62 regardless of the input signal, and controls the switching circuit 63 after the elapse of time T to switch from the first oscillation source 67 to the second oscillation source 68, that is, Switch from normal mode to sleep mode. Therefore, the operating time in the normal mode is only the time T.
[0025]
When any key input is performed again during the time measurement, for example, even when the corner of a book or the like touches the operation key of the DAT key input unit 7 due to the vibration of the bag, the control unit 61 The time measurement of the timer 62 is continued regardless of the input signal. That is, even if the intermittent input operation is repeated, the time is measured from the stage where the first input signal is received (the start portion of the time indicated by B in FIG. 4B), and a predetermined time (T ), The control unit 61 controls the switching circuit 63 to switch from the first oscillation source 67 to the second oscillation source 68, that is, from the normal mode to the sleep mode. Therefore, also in this case, the operation time in the normal mode is only the time T.
[0026]
As described above, in the case of the present invention, even if the input key is kept pressed, or even if the input key is intermittently repeatedly pressed, after a predetermined time elapses after the first key input, Switches to sleep mode.
[0027]
FIG. 5 is a flowchart showing the mode conversion processing of the present invention. When there is a key input from the key input unit 7 in the sleep mode state (401) (402), the mode shifts to the normal mode as described above (403). In response to the input signal, the control unit 61 detects whether or not the hold button 16 is set at the hold position (404). When the hold button 16 is set at the hold position, the control unit 61 sets a predetermined time in the timer 62 and starts measuring time (405). The control unit 61 sends a display signal to the liquid crystal display unit 30 to perform “hold” display (406), and waits for a predetermined time to elapse (407). When the predetermined time elapses, the normal mode is switched to the sleep mode as described above under the control of the control unit 61 (408). If it is determined in step 404 that the state is not the hold state, a normal system operation corresponding to the input key is performed (409).
[0028]
The DAT has been described above as an example, but the present invention can also be applied to a mini-disc (MD) player, a compact disc (CD) player, a cassette tape recorder, and the like.
[0029]
In addition, although the switching time to the sleep mode has been described as 15 seconds, this can be arbitrarily determined.
[0030]
【The invention's effect】
According to the present invention, when there is a key input in the hold state, measurement of the mode switching time is started when the key is input, so even if the key is kept pressed, the sleep is performed after a predetermined time. The mode can be switched, and the power saving effect of the electronic device can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of an example of a DAT to which the present invention can be applied.
FIG. 2 is a block diagram showing a configuration of an example of a DAT to which the present invention can be applied.
FIG. 3 is a block diagram showing a configuration of an example of a DAT to which the present invention is applied.
FIG. 4 is a timing chart showing mode switching when there is a key input in the hold state.
FIG. 5 is a flowchart showing a mode conversion process according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Key input part 16 Hold button 25 System controller 30 Liquid crystal display part 61 Control part 62 Timer 63 Switching circuit 67 1st oscillation source 68 2nd oscillation source 70 Control object system

Claims (2)

Switching means for switching the operation clock of the system controller between the low speed mode and the high speed mode;
In the mode that prohibits the control according to the operation of the operating means, control the operation clock of the system controller to the low speed mode,
Control means for controlling the switching means so as to switch to the low-speed mode again after a predetermined time has elapsed after switching from the low-speed mode to the high-speed mode when the operation means is operated in the low-speed mode;
An electronic apparatus characterized by automatically switching from a high speed mode to a low speed mode regardless of the operation time of the operation means. The electronic apparatus according to claim 1, further comprising: a hold setting unit that sets the mode for prohibiting control according to the operation of the operation procedure.

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