JP2930076B2 - Electric-mechanical-acoustic converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric-mechanical-acoustic converter used for generating a ringing sound or a ringing vibration of a portable terminal such as a portable telephone, a pager, and a PHS (Personal Handy Phone Set). is there.

[0002]

2. Description of the Related Art Conventionally, mobile phones, pagers, PHSs
(Personal Handy Phone Set) and other mobile terminal devices,
An electric-mechanical-acoustic transducer is installed in the body,
It has been used as a means for selectively generating a bell sound or vibration by connecting an electric signal generator to notify an incoming call.

A conventional electric-mechanical-acoustic converter is shown in FIGS.
This will be described with reference to FIG. FIG. 10 is a block circuit diagram of the concept of a conventional electro-mechanical-acoustic converter, FIG. 11 is a side sectional view of an electro-mechanical-acoustic converter which is the main part thereof, and FIG. FIG. 13 is an electrical impedance frequency characteristic diagram of the acoustic transducer, and FIG. 13 is a perspective view of a mobile phone equipped with the same device.

[0004] First, a description will be given of an electro-mechanical-acoustic transducer which is a main part. Reference numeral 1 denotes a support member having openings at both ends, and 2 denotes a support member via a suspension 3.
A movable portion comprising a yoke 2a, a magnet 2b, and a plate 2c mounted on one of the openings, and a voice coil 5 inserted into a magnetic gap 2d of the movable portion 2 and the other of the support members 1. The diaphragm is attached to the opening of the above.

[0005] The operation of the electro-mechanical-acoustic transducer will be described.
The mass and the stiffness of the suspension 3 constitute a mechanical resonance system, and have a unique resonance frequency. Also,
The diaphragm 4 to which the voice coil 5 is coupled also has a unique resonance frequency generated by its own stiffness and mass.

When an electric signal is applied to the voice coil 5, an action / reaction force is generated between the voice coil 5 and the movable portion 2. When the electric signal matches the inherent resonance frequency of the movable section 2, the movable section 2 vibrates greatly and transmits the vibration force to the support member 1 via the suspension 3. Further, when the electric signal matches the inherent resonance frequency of the diaphragm 4 to which the voice coil 5 is coupled, the diaphragm 4 is greatly vibrated, and a buzzer sound is generated.

As shown in the electric impedance frequency characteristic diagram of FIG. 12, the natural resonance frequency f ₀₁ of the movable section 2 is 1
00Hz is around, the natural resonant frequency f ₀₁ of the diaphragm 4 is 2KHz
Since it is different from before and after, the following convenience can be obtained by generating the respective resonant frequencies.

That is, as shown in FIGS. 10 and 13, an electro-mechanical-sound device A incorporated in a mobile phone 6 sends a signal of a predetermined frequency to an electric signal generator 7 in accordance with an instruction from the main body of the mobile phone 6. The electric signal is input to the electric-mechanical-acoustic converter A, the diaphragm 4 is vibrated to generate sound, the movable part 2 is vibrated, and the mobile phone 6 is vibrated to use the vibration. To notify the person of the incoming call.

If either the movable part 2 or the natural resonance frequency of the diaphragm 4 is selected as the signal of the predetermined frequency, resonance occurs at one of them and a large vibration or sound is obtained. If you do that, you can get something with great vibration and sound.

The above-mentioned conventional electric-mechanical-acoustic converter
Although A has been described as being vibrated and pronounced, there are some which only vibrate or produce sound, and the same applies to the electro-mechanical-acoustic converter in the following embodiments of the invention.

[0011]

As apparent from the above description, in order to generate a large sound or vibration in the electric-mechanical-acoustic converter A, the resonance frequency matching the inherent frequency is set to the electric signal generator 7. The natural frequency changes due to changes in the environmental conditions such as the ambient temperature of the electro-mechanical-acoustic transducer A, and the oscillation frequency of the electric signal generator 7 changes slightly, And the output of the vibration decreases or becomes unstable.

The present invention solves the above problems and provides an electro-mechanical-acoustic converter capable of obtaining a stable oscillation output.

[0013]

In order to solve the above-mentioned problems, an electro-mechanical-acoustic converter according to the present invention comprises at least
Has two different mechanical resonance system, to both configured to be converted electrodeposition <br/> gas of an electric signal inputted <br/> vibration and sound - mechanical - acoustic conversion means, before At least one of the resonance frequencies of the mechanical resonance system of the electric-mechanical-acoustic conversion means.
The signal of the frequency band including the
Signal supply means for supplying the electric signal of the stage;
According to the output of the electric-mechanical-acoustic conversion means,
Among the resonance frequency of the vibration system to detect a signal of any one frequency, and frequency detecting means for supplying the signal to the signal supplying unit, the electro - mechanical - acoustic transducer means, signal supply
Means or closed loop consisting of frequency detection means
Signal switching means inserted at the position of
When the closed loop is closed by the switching means.
The input signal fed from the sheet means, before Symbol electro - mechanical - acoustic transducer means is initially driven, in accordance with the output, where
A constant frequency signal is detected by the frequency detection means,
By being supplied to the signal supply means, the electricity-
Since the mechanical-acoustic conversion means is driven at a predetermined resonance frequency, fluctuations in the resonance frequency are always detected by the frequency detection means, and an extremely stable oscillation output can be efficiently obtained.

Further, electrical of the present invention - mechanical - acoustic transducer comprises an upper Symbol electro - mechanical - outside the closed loop of the acoustic converter
On the side, as an input signal of said amplifying means, before Symbol electrical - in the coupled oscillation means for oscillating an electric signal in the frequency band including the resonance frequency of the mechanical resonance system of the acoustic transducer means <br/>, - mechanical The fluctuation of the resonance frequency is always detected by the frequency detecting means, and an extremely stable oscillation output can be efficiently obtained.

Further, electrical of the present invention - mechanical - acoustic transducer has at least two different mechanical resonance system, also can be converted to either the first or the second electrical signal to vibration and sound
Configured electrically so as - mechanical - acoustic conversion means, before Symbol
Oscillates a electrical signal of a frequency band including the resonance frequency of the mechanical resonance system, before Symbol electro - mechanical - first output to acoustic transducer means
And oscillating means, said first electrical signal and the prior SL second electrical signal oscillates in the previous SL electro - mechanical - a second oscillating means for outputting the acoustic transducer means, before Symbol electro - mechanical - acoustic transducer and frequency detecting means for detecting a <br/> output level means, the output level
Means for comparing the output level with the reference level
When it becomes more serial reference level, before Symbol before Symbol electrically oscillates the detected frequency - and a control means for controlling the pre-Symbol second oscillation means so as to output the acoustic transducer means - mechanical Therefore, the resonance frequency can be found very easily, and the operation at this resonance frequency can be performed very easily and quickly.

Further, electrical of the present invention - mechanical - acoustic transducer has at least two different mechanical resonance system, the first or
Others can also be converted into either dynamic and sound vibration a second electrical signal
Configured electrically so as - mechanical - acoustic conversion means, before Symbol
Oscillates an electric signal of a frequency band including the resonance frequency of the mechanical resonance system, before Symbol electro - mechanical - an oscillating means for outputting a pre-Symbol electrical signal into an acoustic conversion means, before Symbol electro - mechanical - acoustic transducer means <br / > a frequency detecting means for detect the frequency with a preset output level, when pre-Symbol electricity by division - mechanical - frequency band of the frequency signal of the oscillation before and Symbol frequency detecting means including a resonant frequency of the acoustic transducer means since in and a control means for controlling the pre-Symbol oscillation means so as to oscillate the detected frequency as the resonance frequency in the previous SL oscillating means, while reducing the oscillation means one, the resonance frequency due to an environmental change, etc. Is constantly monitored and corrected, and a stable resonance state can be maintained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block circuit diagram of a main part of a portable terminal using an electro-mechanical-acoustic converter according to Embodiment 1 of the present invention. According to the figure, 37 is an antenna, 36 is a received signal processing unit, 38 is a receiver which is a small speaker, 10 is an oscillator, 11 is an amplifier which is an amplifying means to which an output of the oscillator 10 is input, and 12 is an amplifier. Is a conventional electric-mechanical-acoustic transducer A, which is an electric-mechanical-acoustic converter
An electro-mechanical-acoustic converter 13 having the same configuration as that of the electro-mechanical-acoustic converter 12 detects an output of the electro-mechanical-acoustic converter 12 at the time of resonance, and outputs a frequency to the amplifier 11. Note that the oscillator
Numeral 10 oscillates a frequency in a frequency band including at least one of the natural frequencies of the electric-mechanical-acoustic transducer 12 (the natural frequency has been described in the related art and will not be described). However, the output voltage level may be an electric signal generation source, and even if the output voltage level is amplified by the amplifier 11, the electric-mechanical-acoustic converter 12 is driven to generate an oscillation output that does not substantially generate sound or vibration. Is controlled.

Next, the operation will be described. Antenna 37
Receives an incoming signal transmitted from a transmitter of a mobile phone. The incoming signal includes a received signal indicating an incoming call and a received sound signal that is a voice of a sender.
This incoming signal is signal-processed in the received signal processing unit 36, and first, a signal C is generated in response to the received signal for notifying the receiver of the incoming call. When the receiver knows the incoming call and puts the mobile phone into a receivable state, the reception signal processing unit 36 stops the signal C, and enters a state in which the reception sound signal is transmitted to the receiver 38, and the receiver 38 generates the reception sound. When the signal C is generated,
The signal SW normally turns off the switch SW1 due to the signal C.
N. When SW1 is turned on, the output signal of the oscillator 10 is sent to the amplifier 11, and this output signal is amplified and output by the amplifier 11, and is input to the electro-mechanical-acoustic converter 12. At this time, the natural frequency of the electro-mechanical-acoustic transducer 12 (for example, f ₀₁ or f ₀₂ described in FIG. 12 of the related art)
Then, the electrical impedance increases rapidly due to the resonance phenomenon. This change is detected by the frequency detector 13 and the amplifier 11
The signal is further amplified by feeding back the signal, and by repeating this, either or both of the vibration and sound generation by the electro-mechanical-acoustic converter 12 are self-excited.

In the above-described embodiment, when the above-mentioned natural frequency of the electric-mechanical-acoustic transducer 12 fluctuates due to a change in the environment in which the electric-mechanical-acoustic transducer 12 is placed,
Although the output for driving the electro-mechanical-acoustic transducer 12 is reduced and vibration and oscillation are suppressed, since the oscillation from the oscillator 10 continues, the frequency detector 13 detects the resonance point again. And an electro-mechanical-acoustic transducer at a new resonance point
Twelve vibrations and pronunciations will be self-excited. With the above configuration, an electro-mechanical-acoustic converter that can always obtain stable sound and vibration of the electro-mechanical-acoustic converter 12 can be obtained.

FIG. 2 shows one specific example of the electric-mechanical-acoustic transducer 12 and the frequency detector 13, which comprises an operational amplifier 14 and a bridge circuit 15. Z2, Z3 and Z4 are bridges. Load impedance, Z1 indicates the electrical impedance of the voice coil of the electro-mechanical-acoustic converter 12, and Z1, Z2, Z3, Z4 constitute a bridge circuit 15,
The output is set to a balanced state in which the output becomes small (preferably 0) for a frequency signal other than the resonance frequency.

With the above configuration, the amplifier
The oscillation output from the amplified oscillator 10 at 11, the impedance of Z1 when the frequency component is inputted at the resonance point f ₀₁ or f ₀₂ rises sharply, imbalance of the bridge circuit 15 at the resonance frequency, The output from the operational amplifier 14 increases, and this output is input to the amplifier 11. As a result, as described above, the output of the electro-mechanical-acoustic converter 12 is self-excited, and vibration and sound generation occur.

A limiter 16 limits the input from the frequency detector 13 to the amplifier 11. The limiter 16 is not necessarily required.

As described above, the electric-mechanical-acoustic converter of the above-described embodiment always oscillates the signal of the frequency band including the resonance frequency which is the natural frequency of the electric-mechanical-acoustic converter by the oscillator, And self-excited by electric-mechanical-
In addition to causing the acoustic transducer to vibrate or generate sound, the fluctuation of the resonance frequency of the electro-mechanical-acoustic transducer is always detected by the frequency detector, and this is tracked to obtain an extremely stable oscillation output efficiently. It is something that can be done.

(Embodiment 2) FIG.
This will be described with reference to a block circuit diagram of FIG. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. That is, the difference between the present embodiment and the first embodiment lies in the elimination of the above-described oscillator, and the electric circuit including the amplifier 11 and the frequency detector 13 in place of the oscillator has thermal noise and the like included in its own circuit. The point is to use the noise.

Noise such as thermal noise is composed of frequency components of a wide range of band frequencies, and is generally of a lower level than signal components. SW1 becomes O by signal C
N, this noise is amplified by the amplifier 11,
It is input to the electrical-mechanical-acoustic converter 12. Frequency detector
The resonance frequency is detected at 13 and self-excitedly amplified as described in the first embodiment, thereby causing the electro-mechanical-acoustic converter 12 to vibrate or generate sound. As a result, the oscillator can be eliminated to contribute to the cost reduction of the device, and the size can be reduced.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to the block circuit diagram of FIG. In the description, only differences from the second embodiment will be described.

The difference from the second embodiment is that a low-pass filter 19 and a high-pass filter 20 are connected to an amplifier 11 and a frequency detector 13.
The switch SW2, which can be operated by the user as needed, can be selected and applied to the apparatus.

The electro-mechanical-acoustic transducer 12 has at least two
Low-frequency natural resonance frequency f
_{At 01} , a vibration is generated, and at a high natural resonance frequency _f02 , a sound is generated. When vibration occurs, the switch SW2 is turned on by the selection signal D corresponding to the state of the selection switch (not shown) which can be operated by the user as necessary, and the high-frequency _f02 is cut by the low-pass filter 19, and Frequency f ₀₁
Pass through. When a sound is generated, the switch SW2 is turned to the A side by the signal D, the low frequency _f01 is cut by the high-pass filter 20, and the high frequency _f02 is passed. Normally, when only vibration or sound is generated, the switch SW2 may be set to either A or B. Intermittent vibration or sound can also be generated by turning on / off the switch SW1 using the signal C as a repetitive pulse of a predetermined cycle. On the other hand, switch S
If the switch SW2 is alternately switched to A and A while W1 is in the ON state, vibration and sound can be generated alternately in a time-sharing manner. Note that only one of the low-pass filter 19 and the high-pass filter 20 may pass two natural resonance frequencies to simultaneously generate vibration and sound.

Further, it has three or more natural resonance frequencies,
When a natural resonance frequency surrounded by the other two resonance points is used, a bandpass filter may be used instead of the two filters 19 and 20 in FIG.

With the above arrangement, self-excited oscillation outside the target is prevented, and when used in a mobile phone, the selection of vibration and sound generation can be made very easily.

(Embodiment 4) Embodiment 4 of the present invention will be described with reference to the block circuit diagram of FIG. The main difference between the present embodiment and the third embodiment is that a limiter 21 is inserted on the output side of the frequency detector 13.

With the above-described configuration, the output level of the frequency detector 13 is limited and the amplifier 11 and the electric-mechanical-acoustic converter 12 are limited.
To prevent excessive input due to self-excited oscillation to the power supply.

(Embodiment 5) Embodiment 5 of the present invention will be described with reference to the block circuit diagram of FIG. The main difference between the present embodiment and the third embodiment is that the switch SW3
Is provided between the signal processing unit 36 and the receiver 38.

Normally, the receiving sound, which is the voice of the sender, is reproduced by the receiver 38 with the portable telephone kept in touch. Therefore, the sound pressure reproduced from the receiver 38 is low, and the receiver sound cannot be heard when the mobile phone is separated from the ear. Further, since the sound pressure level reproduced by the receiver 38 may cause damage to the ear, it is legally restricted to increase the sound pressure level more than necessary. Therefore, a switch SW3 is provided in front of the receiver 38, the switch SW1 is turned off, the output from the frequency detector 13 is cut off, and the reception signal output from the signal processing unit 36 is input to the amplifier 11 by the switch SW3. If the signal is amplified at 11 and reproduced by the electric-mechanical-acoustic converter 12, the received sound can be heard even when the user is away from the mobile phone. Also, the signal to be reproduced is not only the reception sound,
It may be a music signal or a message message. Further, vibration may be generated by the electric-mechanical-acoustic converter 12. Further, the reproduction of the reception sound may be performed not only when the reception sound is received but also when a conversation is exchanged between the sender and the receiver.

(Embodiment 6) Embodiment 6 of the present invention will be described with reference to the block circuit diagram of FIG. The main difference between the present embodiment and the fifth embodiment is that the switch SW3
Is output after the amplifier 11. In this case, the received sound sent from the signal processing unit 36 to the switch SW3 is amplified to a sound pressure level necessary for reproduction by the electric-mechanical-acoustic converter 12. As a result, it is not necessary to adjust the amplification factor of the amplifier 11 or the like.

(Embodiment 7) Embodiment 7 of the present invention will be described with reference to the block circuit diagram of FIG. In the figure, 12 is an electro-mechanical-acoustic converter, 25 is a first oscillator that outputs a low level in a frequency band including the resonance frequency of the electro-mechanical-acoustic converter 12, and 26 is The second oscillator controlled by the control unit 32 described later, 27
Inputs the input to the electro-mechanical-acoustic transducer 12 to a first oscillator 25
And a switch for switching the second oscillator 26, 28 is a frequency detector for detecting the resonance frequency of the electro-mechanical-acoustic transducer 12, 29 is the output voltage of the frequency detector 28 and a preset reference potential A voltage comparison circuit 32 detects a potential difference between the first oscillator 25 and the switch 27 in response to the signal C described in the first embodiment.

The operation of the electric-mechanical-acoustic converter configured as described above will be described. First, when the switch 27 is set to the first transmitter 25 side according to an instruction of the control unit 32, the first
Oscillator 25 is oscillated. The oscillation is performed by sweeping a frequency band including the resonance frequency of the electro-mechanical-acoustic transducer 12. The sweep signal is detected by the frequency detector. At the same time, the voltage comparison circuit 29 compares the potential difference between the output voltage of the frequency detector 28 and the reference potential. When the potential difference becomes equal to or higher than the reference potential, the switch 27 is switched to the second oscillator 26 to oscillate the second oscillator 26, and the electro-mechanical-acoustic converter 1
2 and the electric-mechanical-acoustic converter 12 is operated at the oscillation frequency at this time.

Next, the switch 27 is switched to the first oscillator 25 side. The frequency of the sweep signal at that time is higher than the first oscillation frequency. As described above, the sweep signal is detected by the frequency detector 28. At the same time, the voltage comparison circuit 29 compares the potential difference between the output voltage of the frequency detector 28 and the reference potential. When the potential difference exceeds the reference potential, the switch 27 is switched to the second oscillator
Is oscillated and output to the electric-mechanical-acoustic converter 12, and the electric-mechanical-acoustic converter 12 is operated again at the oscillation frequency at this time.

The above operation is repeated. In this way,
The output of the natural resonance frequency by the second oscillator 26 is electric-mechanical-
The electric-mechanical-acoustic transducer 12 is input to the acoustic transducer 12
Is caused to vibrate or sound, so that the resonance frequency can be found very easily, and the operation at this resonance frequency can be performed very easily and quickly as compared with those of the first to sixth embodiments. Is what you can do.

When it is confirmed by the voltage comparison circuit 29 that the resonance point has shifted due to a change in the environment and the potential difference level has decreased, the control unit 32 drives the switch 27 again, and
By switching to the first oscillator 25 and starting from the above-described detection of the initial resonance frequency, it is possible to cope with environmental changes.

(Eighth Embodiment) FIG.
This will be described with reference to a block circuit diagram of FIG. In the description, the same parts as in the seventh embodiment will be omitted from description. The difference from the seventh embodiment is that only the oscillation unit 31 is used as the oscillation unit. First, the resonance frequency is detected by the frequency detector 28, and the detection result is notified to the control unit 32 through the voltage comparison circuit 29. Next, the control unit 32 instructs the oscillation unit 31 on the resonance frequency. The oscillating unit 31
Machine-acoustic transducer 12 is fully driven (vibration and / or sound)
Oscillation.

The detection of the resonance frequency due to a change in the environment and the subsequent oscillation of the resonance frequency are the same as the steps in the seventh embodiment, and a description thereof will be omitted.

With the above configuration, one oscillation means can be reduced, and an electric-mechanical-acoustic converter having a simple circuit configuration can be provided.

Also, by instructing the two oscillation frequencies in time division from the control unit 32 to the oscillation unit 31, the oscillation unit 31 can oscillate at two resonance frequencies in time division. As a result, vibration and sound can be alternately generated from the electric-mechanical-acoustic converter 12. As a result, the number of oscillating means can be reduced to one, and the deviation of the resonance frequency due to an environmental change or the like can be constantly monitored and corrected to maintain a stable resonance state.

Note that the electric-mechanical-acoustic converter described in the seventh and eighth embodiments is an electric-mechanical-acoustic converter 12.
It is also possible to integrate as a microcomputer except for.

Further, in this embodiment, the electro-mechanical-acoustic transducer is of a conductive type using a magnetic force generated in a voice coil inserted in a magnetic field, but a transducer of a piezoelectric type, an electromagnetic type, etc. The same effect can be obtained by the method.

[0048]

As described above, the configuration of the electro-mechanical-acoustic converter of the present invention is such that the fluctuation of the resonance frequency is always detected by the detecting means, and an extremely stable oscillation output can be efficiently obtained.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a main part of a portable terminal using an electro-mechanical-acoustic converter according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a specific example of an electric-mechanical-acoustic converter and a frequency detecting unit, which are the main parts

FIG. 3 is a block circuit diagram according to a second embodiment;

FIG. 4 is a block circuit diagram according to a third embodiment;

FIG. 5 is a block circuit diagram according to a fourth embodiment;

FIG. 6 is a block circuit diagram according to a fifth embodiment;

FIG. 7 is a block circuit diagram according to a sixth embodiment;

FIG. 8 is a block circuit diagram according to a seventh embodiment;

FIG. 9 is a block circuit diagram according to an eighth embodiment.

FIG. 10 is a block circuit diagram of a conventional electric-mechanical-acoustic converter.

FIG. 11 is a side sectional view of an electric-mechanical-acoustic transducer which is a main part of the same.

FIG. 12 is a diagram showing the same frequency characteristics.

FIG. 13 is a perspective view of a mobile phone equipped with the electric-mechanical-acoustic converter.

[Explanation of symbols]

 Reference Signs List 10 oscillator 11 amplifier 12 electromechanical-acoustic converter 13 frequency detector 16, 21 limiter 19 low-pass filter 20 high-pass filter 25 first oscillator 26 second oscillator 28 frequency detector 31 oscillating unit 32 control unit

────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Kuze, Inventor 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-8-275293 (JP, A) 85192 (JP, U) "Ultrasonic Technology Handbook", Nikkan Kogyo Shimbun, published November 25, 1960, PP569-570, (bridge method) (58) Fields investigated (Int. Cl. ⁶ , DB name) B06B 1/04

Claims (14)

(57) [Claims] [Claim 1 further comprising at least two different mechanical resonance system, also converted into any of the input electric signal to vibration and sound
Acoustic converting means, before Symbol electro - - Mechanical - electrical configured to allow mechanical - the frequency band of the signal including at least one of the resonance frequency before Symbol mechanical resonance system of acoustic transducer means, before <br / > Symbol electro - mechanical - signal supply means for supplying a pre-Symbol electrical signal transducing means, before Symbol electro - mechanical - depending on the output of acoustic transducer means, said motor
械 Shin of any one frequency of the resonance frequency of the resonance system
No. detects a frequency detecting means for supplying the signal to the pre-SL signal supply means, the electro - mechanical - acoustic transducer means, signal supply means, the frequency
Insert into any position of closed loop composed of detection means
Signal switching means, when the closed loop is closed by the signal switching means,
According to the input signal supplied from the signal supply unit,
The electro-mechanical-acoustic conversion means is initially driven and outputs
Accordingly, a predetermined frequency signal is generated by the frequency detecting means.
Detected and supplied to the signal supply means,
The electro-mechanical-acoustic conversion means is driven at a predetermined resonance frequency.
An electro-mechanical-acoustic converter characterized by being operated . 2. A pre-SL signal supply means, electrical of claim 1 wherein the amplifying means for amplifying the input signal - mechanical - acoustic converter. 3. A pre-Symbol amplifying means, electrical prior Symbol noise generated by the electric circuit system including at least one of the amplifying means and before Symbol frequency detecting means, according to claim 2, wherein a part of the input signal -Mechanical-acoustic transducers. As an input signal wherein said amplifier means, before Symbol electro - mechanical - oscillation means for oscillating an electric signal in the frequency band including the resonance frequency of the mechanical resonance system of acoustic transducer means, before
An electro-mechanical-acoustic converter according to claim 1 or 2 coupled outside the closed loop . Wherein said frequency detection means, at least one of the mechanical resonance system to immediately Bei a low pass filter or a high pass filter or a band pass filter passes the resonance frequency of claim 1 according electro - mechanical - acoustic converter. 6. Before SL electrical of claim 3 or 4, wherein the insertion of the limiter for limiting the output of the previous SL-frequency detection means to the output side of the frequency detecting means - mechanical - acoustic converter. 7. A antenna for receiving an incoming signal, the received signal processing means for outputting an electric signal before Symbol incoming signal signal processing, by pre SL electric signals into vibration and sound 請
Motomeko 1,5 or according 6 electro - mechanical - portable terminal composed of the acoustic transducer. 8. received signal and an antenna for receiving an incoming signal, the pre-Symbol incoming signal and received signal processing means for outputting a pre-Symbol received signal before Symbol electrical signal signal processing, prior Symbol electrical signal
The method of claim 1, wherein the vibration is converted into only vibration or vibration and sound .
5 or according 6 electro - mechanical - a mobile terminal constituted by the transducing hand stage, before Symbol electro - mechanical - acoustic transducer means mobile characterized by having a function to play the previous SL received signal Terminal. 9. at least two different mechanical resonance system, to any of the dynamic and sound vibration of the first or second electrical signal
Constructed electrically as it is convertible - mechanical - acoustic transducer hands
Oscillates the stage, the electrical signal of a frequency band including the resonance frequency before Symbol mechanical resonance system, before Symbol electro - mechanical - a first oscillating means for outputting the acoustic transducer means, said first electrical signal and before Oscillating the second electrical signal;
Comparing the frequency detecting means for detect the output level of the acoustic transducer means, the output level and the reference level - a second oscillating means for outputting the acoustic transducer means, before Symbol electro - - before Symbol electro - mechanical machinery comparing means, when the output level becomes equal to or higher than the reference level, prior Symbol detected before Symbol electrical oscillating frequency - machine - to output the sound converting means <br/> before Symbol second oscillation An electro-mechanical-acoustic converter comprising control means for controlling the means. 10. has at least two different mechanical resonance system, one of the dynamic and sound vibration of the first or second electrical signal
Constructed electrically as to a possible transformation - mechanical - acoustic transducer
Oscillating means, an electrical signal <br/> No. frequency range including a resonant frequency before Symbol mechanical resonance system, before Symbol electro - mechanical - an oscillating means for outputting a pre-Symbol electrical signal into an acoustic conversion means, before Symbol electro - mechanical - frequency detecting means for detect the frequency with a preset output level of the acoustic transducer means, when pre-Symbol electricity by division - the machine - the oscillation frequency band of the frequency signal including a resonance frequency of the acoustic transducer means When electrical composed of a front Symbol control means for controlling the pre-Symbol oscillation means so as to oscillate in the previous SL oscillation means frequency detected as the resonance frequency at a frequency detecting means - mechanical - acoustic converter. 11. A frequency band including a resonance frequency of a mechanical resonance system of said electro-mechanical-acoustic conversion means.
Be swept from the high-frequency or high-frequency to low frequency from the low-frequency
Claims that can output an electrical signal
An electro-mechanical-acoustic converter according to claim 9 or 10 . 12. The electric machine according to claim 12, wherein said frequency detecting means comprises:
The electrical impedance of the mechanical-acoustic conversion means is one element,
A bridge circuit comprising at least three other elements.
11. The electro-mechanical-acoustic conversion according to claim 1, 9 or 10.
Equipment . 13. The electricity of said electric-mechanical-acoustic conversion means.
Impedance Z1, a circuit element connected in series with Z1
The electrical impedance of Z2, the electrical impedance
Parallel with the series circuit of Z1 and Z2, each connected in series
The input impedance is Z3 and Z4.
The force is applied to the electrical impedances Z1 and Z3,
Is applied to the contacts of air impedance Z2 and Z4,
The force is likewise from the contacts of Z1, Z2 and the contacts of Z3, Z4
13. The electro-mechanical-acoustic converter according to claim 12, which is taken out.
Place . 14. A contact for extracting said electric output, Z1,
An operational amplifier is used for the contacts of Z2 and Z3, Z4
14. The electro-mechanical-acoustic converter according to claim 13, wherein the electro-mechanical-acoustic converter is configured by joining a differential amplifier .