JPS58111790A - Circuit for electronic time piece - Google Patents

Abstract

PURPOSE:To facilitate the lighting of an illumination lamp without operation of a lamp switch by detecting a voice pressure level from a voice input unit. CONSTITUTION:As a user of a time piece emits a voice to a microphone 1, a voice signal is outputted from the microphone 1. The voice signal is fed to a voice signal detecting section 3 through a preamplification section 2. When the voltage level of the voice signal fed to the detection section 3 is above a set value, with a judgement that the voice signal was inputted, the detection section 3 outputs the detection signal of the voice to a lamp control section 4 which outputs a lamp lighting signal to light an illumination lamp 6 through a lamp driver section 5. This facilitates the lighting of the illumination lamp without the operation of a lamp switch.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for an electronic watch that detects the sound pressure level of a voice input from a voice input device and lights up a lamp when the sound pressure reaches a predetermined value or higher.

The illumination lamp of a conventional electronic watch is turned on by pressing a lamp switch. Generally, input switches on electronic clocks are small and difficult to press. Furthermore, it is difficult and inconvenient to press the switch for lighting lamps in the dark. When you need to know the time in the garden, while driving a car, or in the dark, it is nearly impossible to press the light switch on a regular electronic clock.

Therefore, the illumination lamp of an electronic watch is used less frequently and does not perform its function satisfactorily.

The present invention has been made to eliminate such drawbacks, and its object is to provide an electronic timepiece in which an illumination lamp can be easily turned on without pressing a lamp switch.

The present invention will be described in detail based on the examples above.

FIG. 1 is a block diagram of one embodiment according to the present invention. 1
2 is an audio signal preamplifier section, 3 is an audio signal level detection section, 4 is a lamp control section, 5 is a part of the lamp driver 2, and 6 is an illumination lamp. When the user of the watch speaks into the microphone 1, the microphone outputs an audio signal. In the preamplifier section, noise is removed and the audio signal is amplified. The signal is input to the audio signal detection section 3, and if the voltage level of the audio signal is above a predetermined value, it is determined that an audio signal has been input, and an audio detection signal is output and input to the lamp control section 4. . The lamp control section has a built-in timer, and outputs a lamp lighting signal for a certain period of time in response to an audio detection signal. The lamp lighting signal is input to the lamp driver part 5 to light the illumination lamp 6. In this way, the user of the electronic watch can turn on the illumination lamp by emitting sound to the speaker built into the electronic watch.

This will be explained in more detail using the circuit diagrams of each block.

Figure 2 is a circuit diagram of each block diagram 1, 2, 3, 4.5,
6 is the same as in FIG.

The resistor 7 and capacitor 8 form a low pass filter. The signal S1 input from the microphone 1 passes through a low-pass filter, and high frequency components such as noise are removed, resulting in a signal S2. 9.

is a coupling capacitor, river is a variable resistor, 11 is an inverter, and I2 is a feedback resistor. The stain pressure of S2 is amplified by the inverter 11. The variable resistor IO is a resistor that changes the amplification factor. By changing this resistance,
The sound pressure level detection voltage can be adjusted. The voltage amplified signal is 83. The signal S3 is input to an inverter constituted by a P-channel transistor 13 and an N-channel transistor 14. In order to determine the detection level, the threshold voltage of the P-channel transistor B is set high and the mutual conductance is set small, and the threshold voltage of the N-channel transistor 14 is set low and the mutual conductance is set large. When the voltage amplitude of S3 is greater than the detection level, the signal of S4 becomes a logic level "no-y". (Hereinafter, logic level "high" will be replaced by H2 logic level "
15 and 16 are NOR circuits that constitute a set and reset circuit, 17 is a 4-dedicated frequency divider circuit whose output Q changes when the clock becomes L, and 18 is a W frequency divider circuit with data input. be.

Terminal B is connected to the frequency dividing circuit of the electronic clock, and outputs the signal of the frequency dividing circuit. S5 is a signal that determines the lighting time of the lamp. The frequency dividing circuits 17 and 18 constitute a timer. When S4 becomes H, 86 becomes L, the reset of the frequency dividing circuits 17 and 18 is released, and the signal of S5 is input to the frequency dividing circuit. After one to two cycles of S5 have passed, S7 becomes H, inputs to the NOR circuit 16, and S6 becomes H.
become. Then, the frequency dividing circuit is reset, S7 is changed to L, and the circuit returns to its initial state. While S6 is L, NPN
Transistor d] turns on and the lamp 6 lights up.

The lighting time is determined by the frequency of S5. The above operation is shown in a timing chart as shown in FIG. 3.

Sl p S2 p S3 p S4 p85
p J corresponds to FIG. Sl p82
p8m represents voltage amplitude on the vertical axis. 21 indicates the detection level. Audio input starts at point 22, and at that point, it is determined that there is audio input, and the lamp lights up.
The lamp is off at 24. A high-pitched voice wave 5-form such as Sl is output from the microphone, passes through a low-pass filter, and is amplified as shown in 83.

When S3 swings much higher than the detection level 21, 84 goes to H, and at the same time S6 goes to L, and the lamp lights up.

When the timer signal S6 goes high, the lamp goes out.

In addition, the detection system can be similarly implemented using a comparator.

As described above, according to the present invention, the lamp can be turned on without touching the lamp switch, and the function of the illumination lamp, which is to turn on the lamp in the dark, can be fully demonstrated. Since the circuit for realizing the present invention can be constructed with a very small number of elements, the chip size may become large.
In addition, the microphone for voice input can be shared with the alarm speaker installed in general electronic watches, so there is no need to add anything new to conventional electronic watches. It has excellent effects such as:

61

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment according to the present invention, FIG. 2 is a circuit diagram according to the present invention, and FIG. 3 is a signal waveform and timing chart of each part of FIG. 2. 19. Driver for lighting lamp transistor 81.
・Audio signal S2 from the microphone ・Audio signal S3 that has passed the low-pass filter ・Amplified audio signal S4 ・Audio detection signal S5 ・Clock S6 from the frequency dividing circuit ・Lamp control signal 7 ・・More than a timer signal Applicant Shimauchi Seiki Co., Ltd. Suwa Seikosha Co., Ltd. Representative Patent Attorney Senior Managing Director

Claims (1)

[Claims] [1] At least an oscillator and a frequency divider as a time reference source;
In an electronic watch composed of a display means, an illumination lamp, an audio input device, and a power supply battery, the audio input device includes a circuit that converts audio into an electrical signal and detects the amplitude of the electrical signal, A circuit for an electronic watch, characterized in that the circuit for an electronic timepiece is configured to light the illumination lamp in response to an output signal of the detection circuit. 121. The circuit for an electronic timepiece according to claim 1, wherein the illumination lamp is provided with a tire configured to continue to be lit for a specific period of time after being lit, and then turn off.