JPH0366855B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a remote control transmitter.

[Conventional technology]

An example of a conventional, generally known remote control transmitter is shown in FIG. 3. In the figure, 1 is an oscillation circuit that generates a reference signal and has an oscillation stop function, and 2 is a circuit from this oscillation circuit 1. 3 is an m×n (m and n are integers) keyboard matrix; 4 is a scan output circuit that outputs a scan signal to the keyboard matrix 3; 5 is a timing generation circuit that inputs a reference signal and generates timing (clock); This is a key input circuit that receives the output of the keyboard matrix 3 as an input.

6 is an instruction circuit that determines the key input signal from the keyboard matrix circuit 3 and sets the output timing of the transmission signal; 7 is a first counter that sets the operating order of this instruction circuit 6; 8 is the above-mentioned This is an output circuit that receives the output signal from the instruction circuit 6 and outputs a transmission signal 70.

The operation of the remote control transmitter in the circuit configured as described above will be explained with reference to the time chart shown in FIG.

FIG. 4 shows the input signal applied to the input terminal 10 of the key input circuit 5 and the scan signal applied to the output terminal 40 of the scan output circuit 4 in the keyboard matrix 3.
This is a time chart for when the key is turned on and off.

In the figure, A is the input terminal 1 of the key input circuit 5.
0, and B, C, and D indicate the output terminals 40 and 5 of the scan output circuit 4, respectively.
The states 0 and 60, that is, the scan output signals are shown, T to N respectively show the count values of the counter 7, E shows the transmission signal 70, and F shows the oscillation state of the oscillation circuit 1.

First, in the key input waiting state (period (a)) in which no key in keyboard matrix 3 is turned on,
The state of the input terminal 10 of the key input circuit 5 is "H",
Output terminals 40, 50, 60 of scan output circuit 4
The states B, C, and D of the transmission signal 70 are "L", and the state E of the transmission signal 70 is "L", and the instruction circuit 6
Set the operation order. The first counter 7 is in the initial count state as shown in FIGS.

Point (α) is when the key of the keyboard matrix 3 is turned on. At this time, the input terminal 10 of the key input circuit 5 detects "L" of the output terminal 40 of the scan output circuit 4, and the oscillation circuit 1 Oscillation is started, and the first counter 7 starts counting like T-NU. According to the order in which the count value of the first counter 7 advances, the instruction circuit 6 determines the key input, selects the transmission signal corresponding to the key input, and outputs the transmission signal 70 from the output circuit 8. Output. ...Period (b) Next, if there is no key input (period (c)), the instruction circuit 6 determines that there is no key input according to the count value of the first counter 7, and outputs a scan output. Signals B, H, and D become "L", and the count values T to N of the first counter 7 become the initial state. ... (β) point As a result of the above operation, when a key on the keyboard matrix 3 is turned on, the oscillation circuit 1 operates, and when the key is turned off, the oscillation circuit 1 stops oscillating.

[Problem that the invention seeks to solve]

Generally, the count value of the first counter 7 that sets the operating order of the instruction circuit 6 and the count value for operating the instruction circuit 6 do not necessarily match.

With conventional remote control transmitters like the ones mentioned above, noise from the outside can cause
If the count value of the first counter 7 becomes a value other than the count value used for the operation order of the instruction circuit 6, the instruction circuit 6 becomes inoperable and the oscillation is stopped. There was a problem that there was a risk that circuit 1 would continue to oscillate.

As an example of this state, a time chart is shown in Fig. 5. Up to the period (b), the time chart is the same as in Fig. 4, but in the period (c), due to noise etc., the first The case where the count value of the counter 7 goes out of order and becomes larger than the count value used for the operation order of the instruction circuit 6 is defined as point (γ). After this point (γ), the instruction circuit 6 becomes inoperable, the oscillation circuit 1 continues to oscillate, and there is a risk that the state of period (d) will not be able to escape. In other words, there is a risk that the battery will be wasted unnecessarily and that it will become impossible to escape from the state where transmission is not possible.

To get out of this state, you need to turn off the power and then turn it on again to perform the initial settings.

In view of the above points, the present invention has been made to solve such problems.The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional circuits with a simple configuration, and to be able to operate even in a place with a bad environment and a lot of noise. The purpose is to provide a remote control transmitter that can be used without worrying.

[Means for solving problems]

The remote control transmitter according to the invention comprises:
A determination circuit that determines a change in the level of the output signal of the instruction circuit, and a second circuit that counts clocks from the timing generation circuit and is reset when the determination circuit determines a change in the output level.
When the second counter finishes counting, an oscillation circuit that generates a reference signal and has an oscillation stop function stops oscillating, and sets the operating order of the instruction circuit. The first counter is set to a constant count value, that is, the first counter is set to an initial state.

[Effect]

The clock from the timing generation circuit is counted by a second counter, a level change of the output signal is detected by a judgment circuit, and when a level change occurs, the second counter is reset, and this second counter is set. When the count value reaches the specified value, the oscillation circuit is stopped and the first counter is set to an initial state.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing one embodiment of a remote control transmitter according to the present invention.

In FIG. 1, the same reference numerals as in FIG. 3 indicate corresponding parts, and 9 is an instruction circuit 6.
A determination circuit for determining a level change of an output signal of
0 is a second counter that counts the clock from the timing generation circuit 2 and is reset when the determination circuit 9 determines a change in the output level.

Then, the determination circuit 9 detects when the instruction circuit 6 outputs the output signal to the output circuit 8, and when the determination circuit 9 detects the output, the second counter 10 is reset, and the second counter 10 is reset. When the counter 10 reaches a set value, the oscillation circuit 1 is configured to stop oscillating, and the first counter 7 is set to an initial state.

Note that the instruction circuit 6 and the oscillation circuit 1
The signal control line is connected to the oscillation circuit 1 when the instruction circuit 6 detects an oscillation stop command.
This is a control line for stopping the oscillation of the oscillation circuit 1, or for starting the oscillation of the oscillation circuit 1 when it is determined that there is a key input, and the circuit shown in FIG. 3 is also the same. Further, the signal control line between the timing generation circuit 2 and the key input circuit 5 is used to read the key input at the key input circuit 5 at a predetermined timing among the key input circuit 5 and the scan output circuit 4 that constitute the key matrix. This is a control line for key input reading timing. Furthermore, although the signal flow is bidirectional between the instruction circuit 6 and the counter 7, the signal flow from the counter 7 to the instruction circuit 6 is only when the counter 7 specifies the instruction circuit 6. The flow of the signal from the counter 7 to the instruction circuit 6 is from the counter circuit 7 to the instruction circuit 6.
This shows the case where the value of is set.

Next, the operation of the embodiment shown in FIG. 1 will be explained using the time chart shown in FIG.

In FIG. 2, the same reference numerals as in FIGS. 4 and 5 indicate corresponding parts, and ``le'' indicates the determination circuit 9.
The reset signal to the second counter 10 is shown in FIG.

First, point (α) is when the key of the keyboard matrix 3 is turned on. At this time, the input terminal 10 of the key input circuit 5 detects "L" of the output terminal 40 of the scan output circuit 4, and the oscillation circuit 1 starts oscillation, and the first counter 7 starts counting like T-NU. Then, this first counter 7
The instruction circuit 6 determines the key input according to the order in which the count value advances, selects the transmission signal corresponding to the key input, and outputs the transmission signal 70 from the output circuit 8.

Next, the second counter 10 starts counting when the oscillation circuit 1 starts oscillating. and,
The determination circuit 9 detects a change in the level of the transmission signal 70 and outputs a reset signal to the second counter 10. When the second counter 10 receives this reset signal, it resets the count value. Therefore, the second counter 10 is reset every time the reset signal becomes "H".

At point (γ), if the count value of the first counter 7 becomes larger than the count value used for the operation order of the instruction circuit 6 due to noise etc., the period shown in FIG.
The situation will be the same as in (d). In this state, the instruction circuit 6 is inoperative, so the signal from the determination circuit 9 remains at "L". Therefore, the second counter 10 continues counting and stops the oscillation of the oscillation circuit 1 when the set value is reached.
The count value of the first counter 7 is set to the initial setting value, the state of period (d) is exited, and the waiting state of period (a) is entered. (Refer to point ξ) In this way, it is possible to eliminate the drawback of the conventional circuit shown in Figure 3, in which transmission becomes impossible without stopping oscillation, and it is possible to eliminate You can also use it without worrying.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a determination circuit that determines a level change of an output signal of an instruction circuit without using complicated means;
Counts the clock from the timing generation circuit,
A second counter that is reset when the above judgment circuit judges a change in the output level is added, and when this second counter reaches a set count value, the oscillation circuit is stopped, and the above instruction circuit With a simple configuration in which the first counter, which sets the operation order of , is set to the initial state,
It is possible to eliminate the drawback of conventional circuits that transmission becomes impossible without stopping oscillation.
Since it can be used without worrying even in a place with a bad environment and a lot of noise, the practical effect is extremely large.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a remote control transmitter according to the present invention, and FIG.
FIG. 3 is a block diagram showing an example of a conventional remote control transmitter, and FIGS. 4 and 5 are time charts for explaining the operation of FIG. 1...Oscillation circuit, 2...Timing generation circuit,
3... Keyboard matrix, 4... Scan output circuit, 5... Key input circuit, 6... Instruction circuit, 7... Counter (first counter), 8... Output circuit, 9... Judgment circuit , 10...
...Counter (second counter).

Claims (1)

[Claims] 1. An oscillation circuit that generates a reference signal and has an oscillation stop function, a timing generation circuit that inputs the reference signal from this oscillation circuit and generates timing, a scan output circuit that outputs a scan signal to the keyboard matrix, and A key input circuit that receives the output of the keyboard matrix as an input, an instruction circuit that determines the signal from this key input circuit and sets the output timing of the transmission signal, and a third instruction circuit that sets the operation order of this instruction circuit. 1, an output circuit that inputs the output signal from the instruction circuit and outputs a transmission signal, a determination circuit that determines a level change of the output signal of the instruction circuit, and a timing generation circuit. and a second counter that counts the clocks of the oscillation circuit and is reset when the determination circuit determines a change in the output level.When the second counter finishes counting, the oscillation of the oscillation circuit is stopped; A remote control transmitter characterized in that a first counter is set to a constant count value.