JPH03144820A - Input device - Google Patents

Abstract

PURPOSE:To actuate a means which specifies an input key only at the time of the key input by stopping the operation of a 1st key input detection means when the key input is not detected. CONSTITUTION:When a key is inputted via a keyboard 1, a key input device 2 detects the key input and applies an interruption to a CPU 3 via an interruption control circuit 4. Simultaneously, the device 2 sends a key input detection informing signal via a data bus 6. When no specific key is specified for a prescribed time, the CPU 3 sends a key input detection control signal and the prescribed data to the device 2 from an address decoder 5 to stop the key specifying action of the device 2. Thus the operation of a function which specifies a key inputted is stopped if the key input is not detected for a prescribed time. Therefore the key specifying function is actuated only at the time of a key input.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an input device applied to a portable radio telephone device and the like.

(Prior Art) Generally, portable radio telephone devices and the like operate by receiving power from a built-in battery.

Incidentally, such devices are required to be smaller and lighter in order to increase portability. Therefore, the battery is also smaller, and therefore lower /I'1 power consumption is required.

However, the key input detection circuit for specifying the key input by the key input unit needs to operate constantly, which causes a problem of consuming power and draining the battery.

Furthermore, since the key input detection circuit is constantly operating, there is a problem in that the high frequency component of the operating clock is looped through the antenna during reception and noise is generated in the reception channel.

(Problem to be Solved by the Invention) As described above, in the conventional portable radio telephone device, the key input detection circuit for identifying the key input by the key input section is constantly operating, so the battery is exhausted. This was not desirable in terms of wear and noise generation.

SUMMARY OF THE INVENTION The present invention is intended to solve such problems, and an object of the present invention is to provide an input device in which means for specifying a key input is activated only when a key input is performed.

[Configuration of the Invention (Means for Solving the Problems) The present invention provides a key input means having a plurality of keys and through which key input is performed, and a first key input means for specifying a key input by the key input means. a key input detection means; a second key input detection means for detecting that a key input has been made by the key input means; and when the second key input detection means detects that a key input has been made. , starts the operation of the first key input detection means, and when no key input is detected by the first key input detection means for a predetermined period of time, the first key input detection means starts the operation. and control means for stopping the operation.

(Function) In the present invention, a means for detecting that a key input has been made by the key input means is provided, and when it is detected that a key input has been made by this means, a means for identifying the input key is provided. When the operation is started and no key input is detected for a predetermined period of time, the operation of the means for identifying the input key is stopped, so that the means for identifying the input key is stopped. It becomes active only when a key is input.

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

FIG. 1 is a diagram showing the configuration of an input device according to an embodiment of the present invention.

In the figure, 1 is a keyboard having multiple keys; 2 is a keyboard having multiple keys;
is a key input device that specifies a key input using the keyboard 1 and detects that a key input is performed using the keyboard 1.

Further, 3 is a CPU that controls the entire input device, 4 is an interrupt control circuit for issuing an interrupt from the key input device 2 to the CPU 3, and 5 is a circuit for causing the key input device 2 to select data based on the instructions of the CPU 3. 6 is a data bus.

Then, the CPU 3 sends a key input detection control signal and predetermined data from the address decoder 5 to the key input device 2, and stops the key input device 2 from specifying a key.

In this state, when a key is input using keyboard 1,
The key input device 2 detects this, interrupts the CPU 3 via the interrupt control circuit 4, and sends a key input detection notification signal via the data bus 6.

Upon receiving the key input detection notification signal, the CPU 3 sends a key input detection control signal and predetermined data from the address decoder 5 to the key input device 2, and causes the key input device 2 to start an operation for specifying a key.

When a key is specified, the data is sent from the key input device 2 to the CPU 3 via the data bus 6.

In addition, if the key is not identified within the predetermined time, the CPU
3 sends a key input detection control signal and predetermined data from the address decoder 5 to the key input device 2 to stop the key input device 2 from specifying a key.

As described above, in this embodiment, when it is detected that a key input has been made, the operation of the function that identifies the input key is started, and it is detected that the key input has been made for a predetermined period of time. When the input key is not pressed, the operation of the function for specifying the input key is stopped, so the function for specifying the input key is activated only when the input key is input. Therefore, power consumption can be reduced.

Next, it is a block diagram for explaining an embodiment in which the present invention is applied to a portable and vehicle-mounted type radio telephone device.

FIG. 2 is a diagram showing the configuration of the wireless telephone device according to this embodiment.

The radio telephone device shown in the figure is composed of a portable radio device 100 and a vehicle-mounted section main body 200.

The portable radio device 100 includes an antenna 101 and a changeover switch 1.
02. An audio/control unit that performs overall control of the entire device, consisting of a radio unit 103 that forms a wireless line with a base station (not shown) and transfers signals, a control unit 104, and an audio unit 105. unit 106, IDROM 107 in which the system ID number of the zone corresponding to the location where this device is registered and the telephone number corresponding to the location where this device is registered are registered, a power selector switch 1;
08 and controls the power supply to the portable radio 100, a rechargeable battery 110 that serves as a power source when portable, a connection section 111 connected to the vehicle-mounted section main body 200, an operation display section 112, an audible sound Speaker 113 and microphone 114 for input/output, and output amplifier 11
5. The main part consists of an input amplifier 116. The operation display section 112 displays a key part 1 on which a predetermined key input is performed.
17. Display section 118 for displaying a predetermined display; switch section 119 for switching between 6 keys; key section 117; display section 11;
8, an operation/display control section 120 that performs the ml Q of the switch section 119, and a voltage detection circuit 130 that detects the voltage level of the power supply path 130a.

The output amplifier 115 amplifies an audible signal (voice signal) sent from the audio section 105 of the portable radio device 100 and outputs it from the speaker 113. The input amplifier 116 amplifies the high-frequency sound signal (H voice signal) input from the microphone 114. The amplified signal is input to the audio section 105 of the portable radio device 100.

The operation/display control unit 120 is the audio/control unit 106
It performs overall control on the operation display section 112 based on control signals sent from the key section 117, and also sends control signals input from the key section 117 to the audio/control section 106. The display unit 118 consists of a liquid crystal display (not shown) and a display driver.
The liquid crystal display is driven under the control of the display enclosure 120 to display a predetermined display. The key part 117 is "0" to "9".
” number keys “*”, “#”, rsNDJ, rsTO
J, rENDJ, “RcLJ, rFcNJrCLRJ,
It consists of a keypad (not shown) such as rEMRJ, rMUTEJ, and rTONEJ function keys, and when the keypad is pressed, this is recognized by the operation/display control unit 120. The switch unit 119 is provided with a hook switch and an 0N10FF switch (not shown), and the hook switch detects whether the portable radio device 100 is on-hook or off-hook. Note that the hook switch may also be provided on the vehicle-mounted section main body 200. The 0N10FF switch switches the 0N10FF of the entire wireless telephone device, and the switching signal is sent from the operation/display control section 120 to the audio/control section 106.

The in-vehicle main unit 200 includes an antenna 20 attached to the vehicle.
1. A booster 202 that amplifies the signal transmitted and received by the antenna 201 to a constant power, and a booster 202 that amplifies the signal transmitted and received by the antenna 201, and a booster 202 that amplifies the signal transmitted and received by the antenna 201.
Audio/control unit 203 that performs overall control of the entire 0
, a power supply control unit 204 that supplies power from the vehicle battery B to each part, a connection unit 205 that is connected to the connection unit 111 of the portable radio 100 via the coaxial cable 300, and a speaker 206 for inputting and outputting audible sounds. and microphone 207
, an output amplifier 208, and an input amplifier 209. The booster 202 is an antenna duplexer 21
0.211, receiver amplifier 212, transmitter amplifier 21
3. It is composed of an automatic power control circuit (APC) 214 that controls the transmission level of the transmission amplifier 213.

Next, details of the portable radio device 100 will be explained.

FIG. 3 is a block diagram showing the configuration of the above-mentioned flexible radio device 100 in detail.

As shown in the figure, the radio section 103 includes a demodulator 131, a modulator 132, a power amplifier 133, a duplexer 134,
It is composed of a synthesizer 135. Demodulator 131
is transmitted through the antenna 101, changeover switch 102, and duplexer 134 on the portable radio device 100 side, or through the antenna 201, booster 202, and
It demodulates the received signal from the base station that is input via the changeover switch 102 and the duplexer 134. Note that this signal includes a control signal, an audible sound signal, and the like. The modulator 132 modulates the audible signal, control signal, etc. output from the audio/control unit 106 to generate a transmission signal. Power amplifier 133 amplifies the transmission signal output from modulator 132. The duplexer 134 is
A received signal input via the antenna 101 or 201 is sent to the demodulator 131, and a transmitted signal input via the modulator 132 and power amplifier 133 is sent to the antenna 101 or 201.

The synthesizer 135 is a local oscillator for channel selection, and the frequency to be demodulated by the demodulator 131 and the modulator 13
2 specifies the frequency to be modulated.

The audio/control unit 106 includes a CPU 161, an oscillator/
Frequency divider 162, address decoder 163, ROM 164
, RAM 165, radio section control section 166, audio section 1
67, control signal processing section 168, audio section control section 16
9, a digital interface 1701 and an interrupt controller 171. In the figure, 107 is the above-mentioned IDROM, 109 is a power supply control unit, 172 is, for example, an 8-bit data bus, 173 is an address bus, and 1
74 is a control bus.

The CPU 161 performs overall control of the entire audio/control section 106, and the oscillator/frequency divider 162 controls the entire audio/control section 106.
61, and also divides the frequency of this clock and supplies it as a timing signal to each part. Address decoder 163 outputs predetermined operation signals to each section in response to command signals from CPU 161. The ROMI 64 stores various programs necessary for the operation of the CPU 161.

The RAM 165 stores various data during processing by the CPU 161. The wireless unit control unit 166
The wireless unit 103 is controlled based on the command. For example, the radio unit control unit 166 controls the frequency that the synthesizer 135 should specify, the amplification factor that the power amplifier 133 should amplify,
The modulator 132 instructs the degree of modulation to be modulated, and also inputs an out-of-sync signal output from the synthesizer 135, an output detection signal output from the power amplifier 133, etc. as a measure to prevent malfunction, and transmits this to the (:PU 161). The audio section 167 sends a control signal of the received signal demodulated by the demodulator 131 to the control signal processing section 168, and also sends an audible sound signal of the received signal to the output amplifier 11.
5 to the speaker 113. The audio unit 167 also outputs the 1 output from the control signal processing unit 168.
, a control signal and an audible signal output from microphone 114 via input amplifier 116 to modulator 132 .

Note that the audio section 167 has functions of waveform shaping of the control signal to be sent to the control signal processing section 168 and filtering of the control signal to be sent to the modulator 132.

The control signal processing unit 168 performs bit synchronization and frame synchronization with the control signal output from the audio unit 167, captures control data from the base station included in the control signal, which is a serial signal, as a parallel signal, and Control data as a parallel signal to be sent to the base station is sent to the audio section 167 as a control signal that is a serial signal. The audio section control section 169 performs various controls on the audio section 167. For example, the audio section control section 169 performs switching control to send the received signal from the audio section 167 to the control signal processing section 168 or the output amplifier 115; Switching control is performed to input one of the transmitted signals into the audio section 167. Digital interface 170 provides an interface between audio/control section 106 and operation display section 112 . The interrupt controller 171 interrupts the CPU 161 in response to interrupt commands from various parts.

Next, the key part 117 and the display/operation control part 1 described above are explained.
FIG. 4 shows details of the portions of 20 that are related to the key portion 117.

In the figure, 303 is a D-flip-flop for switching the oven drain output buffer 304, 304 is an open drain output buffer 7, 305 is an input buffer, and 308 is a D-flip-flop for sequentially enabling the oven drain output buffer 304. A timing controller unit that generates a clock, 309 to 314 are D-flip-flops provided corresponding to each key and preset when the key is pressed, and 315 to 320 each latch the data of one flip-flop 309 to 314. D-flip-flop.

Next, the operation of the circuit shown in FIG. 4 will be explained by the CPU shown in FIG.
The explanation will be based on the control flow of No. 161.

First, the CPU 161 sends a key input detection control signal 301 which is a chip select signal via the address bus 173 from the address decoder 163 and data 302 via the data bus 172 to the display/operation control section 120 to control the D-flip-flop 303. and enables the oven drain output buffer 3゜4 (step 5o).
1).

Here, when any key in the key section 117 is pressed, the polarity of the key input detection notification signal 306 is inverted via the input buffer 305, and an interrupt signal is sent to the CPU 161 via the interrupt controller 171 (step 502).

The CPU 161 that received the interrupt signal executes the interrupt controller 1.
71 via the data bus 172 to know that the key input detection notification signal 306 has arrived.

Next, the CPU 161 controls the D-flip-flop 303 using the key input detection control signal 301 and data 302 to disable the oven drain output buffer 304 (step 503).

Thereafter, the CPU 161 sends a key input detection control signal 307, which is a chip select signal, to the display operation control unit 120 from the address decoder 163 via the address bus 173, operates the timing controller unit 308, and operates the open drain output buffer 304 for a predetermined period. are sequentially enabled (step 504).

When a key is pressed during this sequential enabling operation, the D-flip-flop corresponding to the pressed key among the D-flip-flops 309-314 is preset.

Then, at the same time as this operation of sequentially changing to the enable state ends, the states of the D-flip-flops 309 to 314 are latched to the D-flip-flops 315 to 320, a key input detection notification signal 321 is output, and an interrupt is generated. An interrupt signal is sent to the CPU 161 via the controller 171.

Upon receiving this interrupt signal, the CPU 161 learns that the key input detection notification signal 321 has come from the interrupt controller 171 via the data bus 172, that is, it knows that the key input detection work has been completed (step 505).

Then, the CPU 161 uses the D-flip-flop 315
The states of 320 to 320 are read as data via the data bus 172, and the pressed key is identified based on this data (step 50t3).

On the other hand, if no interrupt occurs within the above predetermined period, the CP
U161 repeats the above operation again (step 50).
7-509).

Then, if the key is not pressed within a predetermined period of time (
Step 510) The CPU 161 stops sending the key input detection control signal 307, stops the operation of identifying the pressed key, and controls the D-flip-flop 303 using the key input detection control signal 301 and data 302. Then, the oven drain output buffer 304 is enabled and the key press standby state is set (step 5).
o1).

In this manner, in this embodiment, the portion of the display/operation control unit 120 that is related to the key portion 117 for specifying the key input by the key portion 117 is displayed only when a key input is made. It has been made to work. Therefore, power consumption can be reduced and battery consumption can be suppressed.

Further, during reception, the situation in which the high frequency component of the operating clock wraps around from the antenna and generates noise in the reception channel is reduced.

In particular, in terms of reducing power consumption as described above, it is effective when the portable radio device 100 is used with the in-vehicle section main body 200 removed, that is, when it is operated by the rechargeable battery 110, since the capacity of the rechargeable battery 110 is small. .

[Effects of the Invention] As explained above, according to the present invention, a means for detecting that a key input has been made by the key input means is provided, and when it is detected by this means that a key input has been made, the key input is activated. The operation of the means for identifying the inputted key is started, and when no key input is detected for a predetermined period of time, the operation of the means for identifying the inputted key is stopped. The means for specifying an input key is activated only when a key input is performed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an input device according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining an embodiment in which the input device of the present invention is applied to a portable and vehicle-mounted type radio telephone device. Block diagram, Fig. 3 is a block diagram for explaining details of the portable radio device in Fig. 1, Fig. 4 is a part of Fig. 3 and a part related to part A of the display/operation control section. FIG. 5 is a flowchart for explaining the operation of the circuit diagram shown in FIG. 4. 1...Keyboard, 2...Key input device, 3...
CPU, 4... Interrupt control circuit, 5... Address decoder, 6... Data bus. 100...Portable radio, 161...CPU, 303
．． 309-320...D-flip-flop, 304
. . . oven drain output buffer, 305 . . . input buffer, 308 . . . timing controller section.

Claims (1)

[Claims] (1) A key input means having a plurality of keys and through which key input is performed; a first key input detection means for identifying a key input by the key input means; and a key input means by which the key input is performed by the key input means. a second key input detection means for detecting that a key input has been made; and when the second key input detection means detects that a key input has been made, starting the operation of the first key input detection means; The apparatus further comprises a control means for stopping the operation of the first key input detection means when no key input is detected by the first key input detection means for a predetermined period of time. Input device.