JP5263486B2 - Alarm drive device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarm driver for vehicles capable of reducing the generation of abnormal sound other than a desired blowing sound and preventing a user from recognizing the abnormal sound. <P>SOLUTION: The alarm driver for vehicles is provided with an amplifier circuit 2 for outputting a drive signal C for driving a speaker 3 on the basis of a plurality of control signals A and B from a control means 1. The control means 1 outputs a first control signal A which sets the sound pressure of the speaker 3 and is gradually changed upon rising and falling and a second control signal B which sets the tone of the speaker 3 to the amplifier circuit 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an alarm driving device mounted on a vehicle, and is suitable, for example, for a vehicle alarm driving device that drives a warning sound that informs a user in a vehicle that has forgotten to close a door or forget to turn off a light. It is.

Some conventional vehicle alarm driving devices use an amplifier circuit or the like to sound a speaker based on a control signal from a microcomputer (control means). The amplifier circuit of such a speaker control device is configured to perform processing such as amplification and synthesis on the control signal, generate a drive signal for driving the speaker, and output the drive signal to the speaker. For example, it is disclosed in Patent Document 1.
JP-A-8-188084

  However, in such an alarm driving device for a vehicle, a sudden change in sound pressure may distort the speaker drive signal, or the speaker diaphragm may not be able to follow the drive signal. In such a state, the speaker is activated, which may be recognized by the user as an abnormal sound.

  Accordingly, an object of the present invention is made by paying attention to the above-described problems, and reduces the occurrence of abnormal sounds other than desired sounding so as to prevent the user from recognizing. Is to provide.

According to a first aspect of the present invention, there is provided a vehicular alarm driving device including an amplifier circuit that outputs a driving signal for driving a speaker based on a plurality of control signals from a control means. In the driving device, the control means sets the sound pressure of the speaker, sets a first control signal that gradually changes at the time of rising and falling, and sets the tone of the speaker, and also controls the first control. A second control signal having a time longer than the signal is output to the amplifier circuit at the same start timing , and the amplifier circuit combines the first control signal and the second control signal. A signal is output .

According to a second aspect of the present invention, there is provided a vehicular alarm driving apparatus including an amplifier circuit that outputs a driving signal for driving a speaker based on a plurality of control signals from a control means. The alarm driving device for use in the present invention is characterized in that the control means sets a first control signal composed of a rectangular wave for setting a sound pressure of the speaker and a tone color of the speaker, and is longer than the first control signal. A second time control signal is output, and the rising and falling edges of the first control signal output from the control means are gradually changed between the control means and the amplifier circuit. includes a waveform shaping circuit for outputting to the amplifier circuit as a sound pressure control signal is shaped in the amplifier circuit, the sound pressure control signal and if the second control signal at the same start timing And is characterized in that the an amplified formed by output to the speaker as the drive signal.

  The present invention relates to a vehicle alarm drive device including an amplifier circuit that outputs a drive signal for driving a speaker based on a plurality of control signals from a control means, and reduces the occurrence of abnormal noise other than desired sounding. You can prevent users from recognizing.

  Embodiments to which the present invention is applied will be described below with reference to the accompanying drawings.

  What applied this invention to the alarm drive device for vehicles for making an alarm sound provided in a vehicle mounted instrument sound with a speaker is shown as an Example of this invention.

  FIG. 1 is a block diagram showing an electrical configuration of the vehicle alarm driving device. The vehicle alarm driving device includes a control unit 1, an amplifier circuit 2, and a speaker 3.

  For example, a microcomputer can be applied to the control means 1 and is connected to a CAN (Controller Area Network) communication cable, an ignition switch, or the like by wiring not shown, and various information on the vehicle is input, and according to this signal A control signal for blowing the speaker 3 is generated and output to the amplifier circuit 2. The control means 1 includes a CPU for performing arithmetic processing based on various types of information, a read / rewriteable RAM for temporarily storing arithmetic processing results in the CPU, and a ROM storing control programs and control data. And an input / output interface connected by a bus for exchanging the various information, control signals, clock signals, latch signals, and the like.

Further, for example, as shown in FIG. 2, the control means 1 generates a first control signal A composed of a voltage value and a rising / falling timing for setting the sound pressure of the speaker 3 and the blowing pattern (sounding time). A port for outputting and a port for outputting a second control signal B having a frequency for setting the sound pressure of the speaker 3 and a desired tone color are provided. At this time, the control means 1 outputs to the amplifier circuit 2 a first control signal A in which the rise / fall is gradually changed instead of a sudden rectangular change. In this case, the control means 1 starts outputting the first and second control signals A and B to the amplifier circuit 2 at the same timing, and at the time of ending the output, the first control signal The second control signal B is output for a time longer than A (in this case, 20 msec). That is, the second control signal B is stopped after the falling edge of the first control signal A.

  Based on the control signals A and B from the control means 1, the amplifier circuit 2 outputs a drive signal to the speaker 3 so that the speaker 3 sounds at a desired sound pressure, tone, and blowing time. In this case, the amplifier circuit 2 synthesizes the first control signal A and the second control signal B, and outputs the resultant signal to the speaker 3 as a drive signal C.

  The speaker 3 vibrates a vibration member made of a diaphragm on the basis of the drive signal C from the amplifier circuit 2 to make a desired sound, and makes a vehicle user recognize a sound such as an alarm sound.

  Such a vehicle alarm drive device is a vehicle alarm drive device including an amplifier circuit 2 that outputs a drive signal C for driving the speaker 3 based on a plurality of control signals A and B from the control means 1. The control means 1 sets the sound pressure of the speaker 3 and changes the first control signal A that gradually changes at the time of rising and falling, and the second control signal B that sets the tone of the speaker 3. Output to the amplifier circuit 2.

  Accordingly, since the first control signal A input by the amplifier circuit 2 gradually rises or falls, the sound pressure change at this time becomes a gentle drive signal C, and the drive signal C of the speaker 3 is distorted or the speaker 3 Therefore, it is possible to reduce the occurrence of abnormal sounds other than the desired sound and prevent the user from recognizing the noise.

  Next, a configuration of a vehicle alarm drive device as another example will be described with reference to FIGS.

  In this case, the vehicle alarm driving device includes a control unit 11, an amplifier circuit 12, a speaker 13, and a waveform shaping circuit 14.

  The control means 11 can apply a microcomputer, for example like the control means 1 mentioned above, and produces | generates and outputs multiple control signals which consist of a rectangular wave for making the speaker 13 sound.

  The control means 11 includes a port for outputting a first control signal A1 composed of a voltage value and rise / fall timing for setting the sound pressure and sound pattern (sound time) of the speaker 13, and the sound of the speaker 13. And a port for outputting a second control signal B1 having a frequency for setting a pressure and a desired tone color. At this time, the control means 11 is configured to output the first control signal A1 to the waveform shaping circuit 14 and to output the second control signal B1 to the amplifier circuit 12.

The waveform shaping circuit 14 shapes the first control signal A1 from the control means 11 into a desired waveform shape, and for example, a circuit composed of a resistance element, a capacitor element, or the like can be applied. As shown in FIG. 4, the waveform shaping circuit 14 can shape a waveform that gradually changes the rising / falling portion of the first control signal A <b> 1 that is a rectangular waveform. In this case, the waveform shaping circuit 14 depends on the capacitance of the capacitor element. The waveform of the first control signal A1 is shaped and output to the amplifier circuit 12 as the sound pressure control signal A2.

  Based on the second control signal B <b> 1 from the control means 11 and the sound pressure control signal A <b> 2 from the waveform shaping circuit 14, the amplifier circuit 12 should sound the speaker 13 at a desired sound pressure, tone, and sounding time. A drive signal is output to the speaker 13. In this case, the amplifier circuit 12 synthesizes the second control signal B1 and the sound pressure control signal A2, and outputs the synthesized signal to the speaker 14 as the drive signal C1.

  The speaker 13 vibrates a vibration member made of a diaphragm on the basis of the drive signal C1 from the amplifier circuit 12, and makes a desired sound to make a vehicle user recognize a sound such as an alarm sound.

Such a vehicle alarm drive device is a vehicle alarm drive device including an amplifier circuit 12 that outputs a drive signal C for driving the speaker 13 based on a plurality of control signals A 1 and B 1 from the control means 11. The control means 11 outputs a first control signal A1 composed of a rectangular wave for setting the sound pressure of the speaker 13 and a second control signal B1 for setting the tone of the speaker 13, and the control means 11 11 and the amplifier circuit 12, the first control signal A1 output from the control means 11 is shaped so that the rise and fall of the first control signal A1 change gradually, and is output to the amplifier circuit 2 as the sound pressure control signal A2. The waveform shaping circuit 14 is provided, and the amplifier circuit 12 combines the sound pressure control signal A2 and the second control signal B1 and outputs the synthesized signal to the speaker 13 as the drive signal C1. .

  Therefore, since the sound pressure control signal A2 input by the amplifier circuit 12 gradually rises or falls, the sound pressure change at this time becomes a gentle drive signal C1, and the drive signal C1 of the speaker 13 is distorted, Since it becomes the structure which can reduce that a diaphragm cannot follow the drive signal C1, it becomes a vehicle alarm drive device which can reduce generation | occurrence | production of unusual sounds other than desired sounding so that a user may not recognize.

  The vehicle alarm drive device of the present invention has been described by way of example in the configuration of the embodiment described above, but the present invention is not limited to this, and the gist of the present invention is also in other configurations. It goes without saying that various improvements and design changes can be made without departing from the scope of the invention. For example, the first control signal is gradually changed with respect to the rising or falling portion, but the output sound at the rising or falling portion can be changed by changing the degree of change.

The block diagram which shows the structure of embodiment of this invention. The figure which shows an example of the output signal of embodiment same as the above. The block diagram which shows the structure of another example of embodiment of this invention. The figure which shows an example of the output signal of another example same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control means 2 Amplifier circuit 3 Speaker A 1st control signal B 2nd control signal C Drive signal

Claims (2)

A vehicle alarm drive device comprising an amplifier circuit that outputs a drive signal for driving a speaker based on a plurality of control signals from a control means,
The control means sets a sound pressure of the speaker and a first control signal that gradually changes when rising and falling;
The tone color of the speaker is set , and the second control signal having a time longer than the first control signal is output to the amplifier circuit at the same start timing ,
The amplifying circuit outputs the driving signal obtained by combining the first control signal and the second control signal . A vehicle alarm drive device comprising an amplifier circuit that outputs a drive signal for driving a speaker based on a plurality of control signals from a control means,
The control means includes a first control signal composed of a rectangular wave that sets a sound pressure of the speaker;
While setting the tone color of the speaker, and outputting a second control signal of a longer time than the first control signal ,
Between the control means and the amplifier circuit, the rising and falling edges of the first control signal output from the control means are shaped so as to gradually change and output to the amplifier circuit as a sound pressure control signal. Equipped with a waveform shaping circuit
The amplifier circuit synthesizes the sound pressure control signal and the second control signal at the same start timing, and outputs the amplified signal to the speaker as the drive signal. apparatus.

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