KR19990081731A - Insertion-type handset - Google Patents

Abstract

In order to act as a conventional microphone and earphone by a single acoustic conversion element, the ear plug-in handset of a full duplex communication system according to the present invention includes an earpiece, an acoustic conversion element, an impedance element, Electrical signal applying means for applying an electrical signal based on a voice signal to a series circuit of said acoustic conversion element and an impedance element, detecting means for detecting a voltage across said acoustic conversion element, and an electrical signal based on said first audio signal Analog / digital conversion means for converting a digital signal into a digital signal, analog / digital conversion means for converting a terminal signal of an acoustic conversion element into a digital signal, and an acoustic conversion element based on output signals from the two analog / digital conversion means. Digital for extracting a second audio signal from the terminal signal No. arithmetic processing means and the digital signal of the second voice signal calculated accordingly comprises a digital / analog conversion means for converting into an analog electrical signal.

Description

Insertion-type handset

The present invention is designed for transmission and reception of all voice communications and is configured in such a way that the transmitted and received information can be converted into an audible voice by one conversion element, and has a function of acting as a speaker and a microphone. It relates to a handset device.

High-direction gun microphones and the like tend to be used in a noisy environment, such as on a construction site or in a jet, so that ambient background noise rarely enters the microphone. However, since background noise is reflected off the surrounding wall or the wall of the object, it is difficult to eliminate them completely. In addition, in order to improve the directivity, a long elongated cylindrical sound guiding hole is used in the gun microphone, and the collected voice becomes inaudible so that an audible voice electric signal cannot be obtained.

Accordingly, a bone conduction type microphone is generally used to collect the background noise without capturing it. The bone conduction microphone is configured in such a way that a conversion element composed of a vibration energy / electric energy conversion element is provided on the cheekbone, jawbone or skull of the human body, and when the voice is pronounced, the vibration challenged by the bone is converted into electrical energy, The electrical energy thus obtained is captured and then amplified by the collected electrical signal.

Although the above-described bone conduction microphone can collect voice to obtain an electrical signal in the form of sound waves to remove background noise existing in the air, the transmission characteristic is based on the position of the acoustic conversion element with respect to the cheekbone, jawbone or skull described above. In other words, there is a problem in that different contact pressures of the device in the bone and different modes of contact between the device and the bone are significantly different.

Accordingly, it is required to keep the position and contact pressure of the acoustic transducer element constant at all times by using a specific support tool at every use. However, it is difficult to adequately meet these needs every hour. In addition, the bone conduction microphone also has a problem in that the transmission characteristics of the acoustic sound collector are represented by a change in the reproduction characteristics (F characteristics) of the frequency band.

In addition, in another conventional bone conduction microphone, in order to realize voice communication without being affected by background noise, the pronunciation speaker and the sound collecting microphone are each mounted in an ear piece. However, because the pronunciation often interferes with the sound collector, it is generally difficult to make the ear pieces operate as speakers and microphones.

The present invention has been devised to solve the above-mentioned problems with the prior art.

Accordingly, it is an object of the present invention that a voice for delivery to a user and a voice pronounced by a speaker or a user are transmitted in an electrical signal, which is disposed opposite the eardrum in the ear canal for transmission and reception. It is to provide a whistle-embedded handset that is converted into voice vibration using a single acoustic transducer in common, and the voice spoken by the user is configured to be converted into an electrical signal.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically shows a block diagram of an ear insertion apparatus according to a first embodiment of the present invention.

2 is a central vertical cross-sectional view of an ear piece, in accordance with a first embodiment of the present invention;

3 is a circuit diagram of an ear insertion type handset device according to a first embodiment of the present invention.

4 is an equivalent circuit diagram of an ear piece according to the present invention.

FIG. 5 is a block diagram representing an expression for extracting a second speech signal from a terminal voltage of an acoustic conversion element in which the first speech signal and the second speech signal overlap with respect to each other, in accordance with the present invention; FIG.

6 is a central vertical cross-sectional view of another workpiece in accordance with the present invention.

FIG. 7 is a circuit diagram of an ear insertion type handset using the ear piece of FIG. 6. FIG.

8 is a central vertical cross-sectional view of an ear piece in another embodiment of the present invention.

FIG. 9 is a circuit diagram showing another embodiment of the ear plug type handset using the ear plug type ear piece using FIG. 8. FIG.

* Description of the symbols for the main parts of the drawings *

G2: second voice signal G1: first voice signal

1A: Earpiece 2: Sound Conversion Element

3: two-way talk unit 4: wiring cord

8A: Case frame 18: Vibration unit

24, 26, 33, 34: amplifier 36: wiring

38, 39: radio communication means 40: radio receiving unit

In order to achieve the above object according to the present invention, there is provided a whistle-insertion-type handset device, the handpiece is provided with a whisker-insertable insert is inserted into the ear canal; An acoustic conversion element provided in the bottom portion of the sound guide hole penetrating the insertion hole for converting the acoustic vibration into the electrical signal or the electrical signal into the acoustic vibration in both directions; An impedance element connected in series with an electrical circuit of said acoustic conversion element; Electrical signal applying means for applying an electrical signal based on a first voice signal to be transmitted to the ear piece wearer to a series circuit of the acoustic conversion element and the impedance element; Terminal signal detection means of an acoustic conversion element for detecting a voltage across the acoustic conversion element including a second audio signal obtained by electrically converting the voice generated by the ear piece wearer; First analog / digital conversion means for converting the electrical signal into a digital signal based on a first voice signal to be transmitted to the ear piece wearer; Second analog / digital conversion means for converting a terminal signal of the sound conversion element into a digital signal including a second sound signal obtained by electrically converting a sound generated by the ear piece wearer; Inputs two digital signal outputs from the first and second analog / digital converting means, the impedance of the sound converting element, the impedance of the impedance element connected in series to the sound converting element, the series of the sound converting element and the impedance For extracting, by digital arithmetic processing, the second audio signal contained in the terminal signal of the sound conversion element based on the first sound signal applied to the circuit and the terminal signal of the sound conversion element generated at both ends of the sound conversion element. Digital signal arithmetic processing means; And digital / analog conversion means for converting the digital signal of the second voice signal that is arithmeticly calculated and output by the digital signal arithmetic processing means into an analog electric signal.

According to the present invention, the following advantages are achieved. The voice communication device of a full duplex system is provided with one acoustic conversion element mounted in an ear piece. When the piece is then inserted into the ear canal, voice spoken by the user is transmitted to the acoustic transducer through bone conduction. However, since the ear canal is hermetically shielded from high sound pressure acoustic noise surrounding the environment in which the earpiece is used, externally transmitted voice in the form of received and electrical signals can be sufficiently captured at low sound pressure. As such, the noise is difficult to be converted into an electrical signal, whereby it can be sufficiently used as a two-way voice communication device over various and wide ranges such as emergency communication, outdoor communication, and the like.

Subsequently, a preferred embodiment of the insertable handset apparatus according to the present invention is described in detail below with reference to the accompanying drawings.

1 is a block diagram of a bidirectional communication system illustrating only the aspects of the present invention.

In Fig. 1, reference numeral 1 denotes an ear piece on which an acoustic conversion element 2 is mounted, and reference numeral 3 denotes a bidirectional talk unit connected to the acoustic conversion apparatus 2 via a wiring cord 4. .

Also in the figure, reference numeral 5 denotes for outputting the first audio signal G1 applied to the bidirectional talk unit 3 and for inputting the second voice signal G2 output from the bidirectional talk unit 3. Bidirectional communication unit.

The bidirectional communication unit 5 is for carrying out voice communication of a full duplex communication system (full duplex) with an additional bidirectional communication unit 5 'connected via wired or wireless communication means. The first voice signal G1 is a voice signal received by the person who plugged in the ear piece 1, and the second voice signal G2 is voiced by the person who plugs in the ear piece 1 to connect another bidirectional communication unit 5 '. This signal is sent to the person in charge.

The ear insertion type handset apparatus according to the present invention includes an ear piece and a bidirectional talk unit 3 in which the first acoustic conversion element 2 is mounted. The two voice signals are spoken by the user to the first voice signal G1 for transmitting voice information from the outside to the user using the earpiece and to another person on the second acoustic conversion element 2 in real time. A second voice signal G2 for transmitting voice information.

2 is a vertical sectional view of an ear piece 1 showing one embodiment of the invention.

The ear piece 1 is an outer ear fitting tube 6 fitted to an external ear fitting tube, a connecting tube 7 detachably fitted to a rear end of the outer ear fitting tube 6 and the connecting tube 7. It includes a case frame (8) for accommodating the sound conversion element (2) provided at the rear end.

The outer ear fitting tube 6 is provided at the front end with a flange-shaped elastic stopper member 9 having an elastic pin portion 9a on its outer peripheral edge so as to project forward in a hemispherical shape and project rearward. The guide hole 10 penetrates through the shaft center from the front end to the rear end. A large diameter annular groove 12 is provided at the rear end of the acoustic guide hole 10 to engage the large diameter flange 11a at the front end of the fitting portion 11 of the connecting pipe 7. The outer ear canal 6 is made of a flexible material such as soft synthetic resin, rubber or the like so that no pain is caused to the user even when the ear piece 1 is used for a long time.

In particular, the elastic stopper member 9 for elastically fitting to the ear canal has no space using the elastic pin portion 9a to improve the reproducibility of the transmission characteristics and the transmission characteristics of the acoustic vibration induced by the bone conduction vibration. It fits tightly to the ear canal without placing it.

The outer tube 6 is made of a flexible material as described above, and the connecting tube 7 is made of a hard synthetic resin material. The inner cavity 13 at the rear end in the acoustic guide hole 10 of the outer ear fitting tube 6 and the outer diameter 116 of the fitting portion 11 in the connecting tube 7 are shaped and sized to fit closely together. . The large diameter groove 12 of the outer ear fitting tube 6 and the large diameter flange 11 of the connecting tube 7 operate as slip-off stoppers when both of them are fitted to each other.

Thus, if the external fitting tube 6 and the connecting tube 7 are configured to fit together, this cannot be easily separated from each other by simply pushing both in their axial directions. However, if the flexible outer ear fitting tube 6 is bent obliquely at the fitting portion, the fitting tube 6 can be removed from the connecting tube 7 relatively easily.

Various external ear canal tubes 6 having elastic stopper members 9 of different diameters are prepared to be replaced with each other according to the size of the ear canal of the user. The acoustic guide hole 14 penetrates through the center of the fitting 11 axis of the connection pipe 7 so as to be connected to the acoustic guide hole 10 in the outer ear fitting pipe 6.

The connecting pipe 7 protrudes in the axial direction of the tympanic membrane portion 7a and the tympanic membrane portion 7a having the same diameter as the diameter of the outer peripheral portion of the elastic stopper member 9 at the center thereof (left side in FIG. 2). A fitting portion 11 whose diameter is smaller than the eardrum portion by an amount equal to the thickness of the outer fitting portion 6 is provided.

A large diameter flange 15 completely fixed to the case frame 8 is provided at the rear end of the tympanic membrane portion 7a.

In the tympanic membrane 7a, an empty chamber 16 larger in diameter than the acoustic guide hole 14 formed at the center of the axis of the fitting portion 1 is defined.

The large diameter flange 15 provided at the rear end of the connecting pipe 7 is fixed to the outer peripheral portion 17 of the case frame 8 by full molding.

The acoustic conversion element 2 is sandwiched between the connection pipe 7 and the case frame 8. The sound conversion element 2 includes a vibration unit 18 and a diaphragm 19. The diaphragm 19 constitutes a portion corresponding to a cone of a speaker of a general disc shape (not shown), and the vibration unit 18 corresponds to a speaker type electromagnet provided with a moving magnet and a permanent magnet (not shown). Configure the part to

The diaphragm 19 is connected to the connecting tube 7 in a state in which a central portion of the diaphragm 19 is spaced apart from a wall or the like through a donut-shaped spacer 21 provided on both surfaces of its peripheral portion 20. A sealed sandwich is located between the rear end face 22 and the inner surface of the bottom wall 23 of the case frame 2.

The vibration unit 18 is fixed to the case frame 7 with its rear end mounted on the bottom wall 23 of the case frame 8. The front side of the diaphragm 19 is directed towards the acoustic guide holes 10 and 14 and the empty chamber 16. The diaphragm 19 is configured to emit the output vibration converted into the acoustic vibration having the first voice signal G1 (electrical energy) by the vibration unit 18 to the empty chamber 16.

The vibration unit 18 is external to the vibration plate 19 with respect to the electrical energy and vibration energy coupled to the vibration plate 19 such as a combination of a moving coil, a permanent magnet, etc. using a bidirectional energy conversion element. The vibration applied can be converted into an electrical signal.

The voice uttered by the speaker with the ear piece inserted is guided to the ear canal through the skull and the like, and accordingly, the voice induced to the ear canal is transmitted through the diaphragm 6 and the guide tube 76 inserted into the ear canal through the diaphragm 19. Is transmitted to the vibration unit and converted into an electrical signal through the diaphragm 19.

According to the present invention, the voice uttered by the speaker is transmitted to the listener's ear canal by cartilage conduction, which is not realized by conventional bone conduction techniques. Such cartilage conduction exhibits desirable frequency characteristics.

The electrical signal generated in the vibration unit 18 by vibrating through the cartilage conduction is output from the output terminal of the vibration unit 18 in superimposition with the first voice signal G1 applied from the outside.

As shown in FIG. 3, the vibration unit 18 is connected to the bidirectional talk unit 3. The two-way talk unit 3 applies a first voice signal G1 to the vibration unit 18 and, based on the voice vibration transmitted by bone conduction, from the vibration unit 18 to the second voice signal G2. Extract

In Fig. 3, the first voice signal G1 transmitted from the bidirectional communication unit 5 is amplified by an amplifier 24 having a low frequency impedance, and the output thereof is a vibration unit as the acoustic conversion element drive signal e1. (8) and to the series circuit of the impedance element 25.

In this embodiment, a voltage follower type amplifier 24 having an amplification factor defined as 1 is used so that the voice signal G1 and the acoustic converter element driving signal e1 are equal to each other in terms of voltage. do. The impedance element 25 is preferably composed of a resistor made of pure resistance components.

The voltage Vi across the vibration unit 18 is detected by the amplifier 26 having a high input impedance, whereby the terminal signal e2 of the acoustic conversion element is obtained at the output of the amplifier 26.

As in the case of the amplifier 24, a voltage floor type amplifier 26 in which the amplification factor is defined as 1 is used, so that the voltage Vi across the vibration unit 18 and the terminal signal e2 of the acoustic conversion element. The voltages are equal to each other.

In this connection, it should be noted that it is not always necessary for the amplification factor of amplifiers 24 and 26 to be defined as 1, but that factor is defined to obtain the desired gain.

The first voice signal G1 input to the amplifier 24 for driving the vibration unit 18 and equal to the sound conversion element drive signal e1 is converted by the first analog-to-digital converter 27 into digital form. It is converted into the element drive signal E1 and input to the first input terminal 29 of the digital signal processing means 28.

The terminal signal e2 of the acoustic conversion element having the same voltage as the terminal voltage Vi of the vibration unit 18 and the output of the amplifier 26 is converted by the second analog-to-digital converter 30 into a digital acoustic conversion element. Is converted to the terminal signal E2, and is input to the second input terminal 31 of the digital signal processing means 28.

The digital signal processing means 18 is generally called a DSP (Digital Signal Processor) and consists of a highly integrated circuit that includes a CPU, a memory and a peripheral controller.

Recently manufactured IC circuit elements in the form of DSPs that can be specifically realized as digital signal processing means 28, TMS320LC5 family, TMS320F2 family, and the like manufactured by Texas Instruments Inc. are commercially useful.

The program for processing the input signal is loaded into a part of the ROM mounted in the DSP in a state converted into an optimized assembler in the digital signal processing means 28 constituted of the above-described DSP. The first digital signal (which is a digital acoustic conversion element drive signal E1) input to the first input terminal 29 and the terminal signal of the digital acoustic conversion element (which is input to the second input terminal 30) Two analog voice signals generated in real time with a digital signal (E2)) are digitally processed according to a signal processing program.

In the signal processing program, the voice generated by the user using the ear piece 1, i.e., the speaker, is a process for suppressing disturbances back to the speaker (e.g. howling, echo, etc.), anti-noise. There are processes for canceling noise, distortion correction processing in the detected speaker's speech signal, acoustic signal processing such as automatic gain control (AGC), and calculation processing described below to improve the performance.

The voice spoken by the speaker is extracted into the audible voice of the digital signal through this signal processing. The digital voice signal E3 thus extracted is converted into an audible analog voice signal e3 by the digital / analog converter 32 and output from the talk unit 3 as a second voice signal G2.

In order for the combination of microphone and earphone to be fully compatible using a head set or general purpose voice input / output device used in a handset of such communication applications, the two-way talk unit 3 is a It works with telephony communication applications and interphones such as wireless, transceivers, personal computers, and telephone operating systems.

A hand set or a head set in which a conventional microphone and earphone are set in pairs outputs an output signal from a microphone in analog form as an output signal corresponding to a microphone input terminal of a general sound equipment, and the earphone as an input signal from the outside. Receive an analog electrical signal corresponding to

The ear piece 1 according to the invention alone acts the same as the hand set or head set.

The ear piece 1 inserted into the ear canal of the user operates as follows.

When the second voice signal G1 output from the bidirectional communication unit 5 is applied to the talk unit 3, the first voice G1 is amplified by the amplifier 24 and serially connected to the vibration unit 18. It is transmitted to the vibration unit 18 of the sound conversion element 2 on the wiring cord 4 through the impedance element 25 connected to the wire, and is converted into voice transmitted to the user.

In this case, since the elastic pin portion 9a of the elastic stopper member 9 of the ear fitting tube 9 of the ear piece 1 is elastically connected to the ear canal, the inside of the ear canal blocks sound from the outside of the ear. Condition, which causes the noise from outside the ear to not easily enter the ear.

On the other hand, the acoustic converting element 2 of the ear piece 1 operates like a microphone, which acts as follows.

When the user generates voice, the voice (vibration) is conducted to the bone and cartilage, vibrating the outside of the inner ear. As described above, this vibration is a pseudo-voice electrical signal in which the first voice signal G1 is superimposed on the vibration unit 18 of the acoustic conversion element 2 in the form of the terminal voltage Vi of the vibration unit 18. Is detected. The terminal voltage Vi, which represents a pseudo-voice electrical signal, is amplified by the amplifier 26 to become an acoustic conversion element terminal signal e2.

The terminal signal E2 of this acoustic conversion element is converted into the second digital signal E2 by the analog-to-digital converter 30 described above.

The second voice signal G1 is amplified by the amplifier 24 and then applied to the analog / digital converter 27 and converted into the first digital signal E1. The first and second digital signals E1 and E2 are input to the digital signal processing means 28.

In the digital signal processing means 28, based on the first and second digital signals E1 and E2, the following signal processing is performed.

That is, a process of suppressing the disturbance of the voice uttered by the sender back to the sender itself, a process of canceling noise to improve anti-noise resistance, and a process of correcting the frequency characteristic of the pseudo-voice electric signal There are processes, such as automatic gain control (AGC) processing.

Thus, the voice spoken by the sender is supplied to the digital-to-analog converter 32 as an electric voice signal, which is converted into an audible voice and output as an electric voice output signal corresponding to the microphone terminal of a general analog type audible application communication system. do.

In the present invention, the operation of generating the voice vibration transmitted to the user and converting the voice vibration generated by the user into an electrical signal so that the calling unit 3 corresponds to a full duplex (full duplex) communication system. Is performed by a single vibration unit 18, which will be described logically below.

4 shows an equivalent circuit diagram for the vibration unit of the ear piece 1 and its driving circuit.

In the equivalent circuit, the signal e1 indicates that the acoustic conversion element drive source e1 is output from the amplifier 24. The amplifier 24 is composed of a voltage floor circuit in which an amplification factor is set to 1 to digitally convert the voice signal G1 so that the voltage waveform component corresponding thereto is the same as the first voice signal G1 applied from the outside, It is substantially the same as the waveform of the first audio signal E1.

The amplifier 24 is an electrical signal application means for applying an electrical signal obtained by amplifying the first audio signal G1 to a series circuit of the acoustic conversion element and the impedance element 25.

4, the resistor R is an impedance component of the impedance element 25 provided in series with the vibration unit 18; Z is the impedance of the vibration unit 18; Vi is the terminal voltage (the same as the voltage of the terminal signal e2 of the sound conversion element) of the vibration unit corresponding to the pseudo-voice electrical signal generated in association with the user's speech detected by the vibration unit 18; e3 is an electrical signal of a voice spoken by a user corresponding to the second voice signal G2; And i is the current flowing through the equivalent circuit.

Furthermore, in FIG. 4, the pseudo audio signal in which the same acoustic conversion element drive voltage e1 as the first audio signal G1 is superimposed on the second audio signal e3 is the terminal voltage Vi of the vibration unit 18. Is detected.

Next, how the electrical signal e3 corresponding to the second voice signal G2 is extracted from the terminal voltage Vi, that is, how to cope with the full duplex method in the present invention.

In the equivalent circuit shown in Fig. 4, the following formula (1) is obtained based on Kirchhoff's voltage law.

i (R + Z) + e1 + e3 = 0

Since the first audio signal G1 is the same as the acoustic conversion element drive signal e1, the signal e1 is shown for ease of explanation of the equivalent circuit.

Output through the amplifier 16 having an amplification factor of 1 using the terminal voltage Vi as a pseudo audio signal in which the terminal voltage Vi of the vibration unit 18 and the first and second audio signals overlap each other. The pseudo voice signal e2 to be obtained has the same component. To facilitate the description of the equivalent circuit, the signal e2 is made to indicate the terminal voltage.

Formula (1) is performed on the current i, and the following formula (2) is obtained.

i = (e1 + e3) / (R + Z)

In this case, the terminal voltage e2 is obtained by subtracting the terminal voltage R · i of the impedance element 25 from the first audio signal e1. Thus, the following formula (3) is obtained.

e2 = e1-(Ri)

By substituting the current i in the formula (2) into the formula (3), the following formula (4) is obtained.

e2 = e1-R (e1 -e3) = e1 (1- (R / (R + Z))) + e3R / (R + Z)

By performing formula (4) on the speech signal e3, formula (5) is obtained.

e3 = (e2- (e1 (1- (R / (R + Z))) · (R + Z) / R

The impedance component arranged in formula (5) is represented by the block diagram of FIG.

In Fig. 5, each of the impedance components X1 and X2 is as follows;

X1 = 1- (R / R + Z))

Expressed as X2 = (R + Z) / R, the following formula (6) is obtained.

e3 = (e2-eEX1) X2

Based on the block diagram shown in Fig. 5, by arithmetically performing the formula (6), the second speech signal e2 is a pseudo that the first speech signal e1 and the second speech signal e3 are mixed with each other. It is derived from the audio signal (terminal voltage) e2.

In the operation processing of the formula (6) based on the block diagram shown in FIG. 5, the digital acoustic conversion obtained by converting the same acoustic conversion element drive signal e1 as the first audio signal e1 into a digital signal. The terminal voltage E2 of the digital acoustic conversion device obtained by converting the element drive signal E1 and the terminal voltage Vi or the signal e2 of the vibration unit 18 into a digital signal is converted into a digital signal processing means 28. Is entered into and processed.

Subsequently, the terminal voltage Vi, the acoustic conversion element driving voltage (the first voice signal e1), and the impedance R of the impedance element 25 may be measured, and thus, the acoustic conversion of the vibration unit 18 is performed. Once the element 2 is set, the second speech signal e3 can be calculated.

As with the impedance Z of the acoustic conversion element 2, it is essential to obtain an impedance Z that changes every second depending on the operation of the person generating the voice. However, its operation becomes more complicated than necessary, and is calculated by the digital signal processing means 28 using a value obtained under conditions such as, for example, an approximate value Ze.

Here, formula (4) is performed using an approximation value Ze of the impedance Z of the acoustic transducer element 2, ie a temporary value (e2 = 0) in the terminal voltage e2 in formula (4). By substituting, thereby formula (7) is obtained.

1-(Vi / e1) = R / (R + Z)

In the formula (7), since the inverses of both sides are the same, the following formula (8) is obtained.

Z = (1 / (1-Vi / e1)) = (R + Z) / R

Therefore, the impedance Z of the acoustic element 2 becomes as follows.

Z = (1 / (1- (Vi / e1))-1) / R

Formula 9 corrects the value obtained by substituting in Formulas 5 and 6, whereby a second speech signal e2 can be obtained.

Therefore, the ear plug-in handset according to the present invention can cope with the full duplex method (full duplex) by using one ear piece (1).

6 and 7 show another embodiment of the present invention.

The embodiment shown in FIG. 6 amplifies the terminal voltage Vi of the amplifier 24 for driving the acoustic conversion element 2 and the acoustic conversion element 2 provided in the bidirectional transmission unit 3 in the manner described above. Amplifier 26 is installed in the case frame 8A of the ear piece 1A.

FIG. 7 shows a block diagram of a circuit having the ear piece 1A shown in FIG. 6 connected to the bidirectional talk unit 3A.

In this connection, the power supply circuit connected to each amplifier and semiconductor element is not shown in the drawings, and the same reference numerals correspond to the same parts as in the embodiment shown in Figs. It should be noted.

In Fig. 6, the analog operational amplifier IC elements 33, 34 composed of amplifiers 24, 26 are rear earpieces of the vibration unit 18 with these elements mounted on the wiring substrate 35. It is built in the case frame 8A of 1A.

The impedance element 25 is also mounted on the wiring board 35, and the output circuit for driving the vibration unit 18 is connected to the vibration unit 18 via a very short wiring 36.

The input wiring of the amplifier 26 for amplifying the terminal voltage Vi of the vibration unit 18 is wired in a very short state in the wiring substrate 35.

Due to the above arrangement, as shown in the equivalent circuit of FIG. 4, the wiring cord 4 shown in FIGS. 1 to 3 is included in the series connection circuit of the impedance element 22 and the vibration unit 18. Since it is not possible, the intrusion of distortion into the internal impedance Z of the vibration unit 18 can be considerably reduced, whereby a stable second audio signal e3 can be extracted, and stable signal processing control can be realized. Can be.

In addition, since the amplifiers 24 and 26 receive the input signal at the position closest to the vibration unit 18 to perform the voltage floor control, the ratio at which the input signal matches the output signal is high, thereby processing digital signals. The first audio signal E1 in digital form and the terminal voltage E2 in digital form transmitted to the means 28 are recognized as the same as the voltage in the equivalent circuit of FIG. It is close enough to (e2).

In FIG. 7, since the impedance of the wiring cord 37 for connecting the ear piece 1A to the bidirectional talk unit 3A is not included in any parameter of the equivalent circuit shown in FIG. 4, the wiring cord The length and diameter of 37 do not directly affect the control of the full duplex.

On the other hand, even if the bidirectional talk unit 3A according to the present invention can be used without restricting its storage position around the ear to any part of the human body, no acoustically disadvantageous phenomenon occurs.

8 and 9 show another embodiment of the present invention, in which the portion corresponding to the wiring cord 37 shown in FIGS. 6 and 7 is replaced by a pair of wireless communication means 38,39. Then, the ear piece 1B is connected to the bidirectional talk unit 3B.

A radio receiving unit 40 for one radio communication means 38 and a radio transmission unit 41 for the other radio communication means 39 are mounted on the wiring board 35A of the ear piece 1B of FIG. 8. .

As shown in the circuit diagram of FIG. 9, the wireless receiving unit 40 of the ear piece 1B includes a receiving circuit 42 and a demodulation circuit 43, and the output signal from the demodulation circuit is an amplifier ( Is transmitted to the input of 24).

Similarly, the wireless transmission unit 41 includes a modulation circuit 44, and an output signal from the amplifier 26 is received at the input of the modulation circuit 44.

Similarly, the bidirectional calling unit 3B comprises a wireless transmitting unit 46 and a wireless receiving unit 47 for a pair of wireless communication means 38, 39.

The radio transmitting unit 46 for one radio communication means 38 comprises a modulation circuit 48 and a transmission circuit 49, which modulates the first voice signal e1 with an ear piece. Enter it.

The radio receiving unit 47 for another radio communication means 39 comprises a receiver circuit 40 and a demodulation circuit 51, the output from the demodulation circuit 51 being a second analog-to-digital converter. 30 is sent to the input of 30.

Therefore, the wireless communication means 38 constitutes a wireless voice communication channel for transmitting the first voice signal G1 from the bidirectional communication unit 3B to the ear piece 1B. On the other hand, the wireless communication means 39 constitutes a wireless voice communication channel for transmitting the second voice signal G2 from the ear piece 1B to the bidirectional communication unit 3B.

The communication system of the wireless communication means 38, 39 is a frequency modulation system ("FM communication system"), in which the communication area is at a frequency band of several MHz to several hundred MHz and at an output within a specified range for weak electric waves. It is desirable to have an electromagnetic field strength of the output for communication in the range of 1 to 3 meters.

The conductor portion 52 constituting the receiving antenna for the receiving circuit 42 and the conductor portion constituting the transmitting antenna for the transmitting circuit 45 are provided on the rear end face of the case frame 8B of the ear piece 1B.

Although the case frame 8B is molded using an insulating synthetic resin, it is not always necessary to expose the surface of the conductor portions 52 and 53 constituting the antenna, and these portions may be embedded in the synthetic resin.

For the conductor portions 52, 53, one of the helical pattern, the stick pattern, and the comb pattern may be selectively adopted in the two-dimensional pattern depending on the frequency of the communication carrier used.

The wireless communication means 38, 39 can be of the type using infrared light.

The radio communication means 38 and 39 of the type using infrared light generate electromagnetic noise over a large area, especially from an electric welder, a large electric motor, an electric furnace, etc., which generate spark noise. In the operation site which makes it impossible to use, the communication system of the type using infrared rays has the advantage that it can fully perform its role even in the operation site described above.

In addition, at the operation site, when the bidirectional communication unit 3B is provided inside the safety helmet that is required to be worn, the lower edge of the side portion of the safety helmet is located directly above the ear into which the ear piece 1B is inserted, The communication distance is considerably shortened by the provision of a two-way talk unit 3B inside the helmet side just above the ear.

Also in the embodiments shown in FIGS. 1-3 and 6-7, two-way talk units 3, 3A are provided inside the helmet, and the talk unit is wired to the earpiece via a wiring cord. Being connected can be easily realized.

Moreover, as shown in Fig. 1, it is also possible to wirelessly form the bidirectional communication unit 5. In this case, the bidirectional communication unit 5 is designed to have a large output power that can withstand the electromagnetic noise at the operation site sufficiently. In addition, for the modulation system, a digital modulation system or a spectral modulation system having a strong resistance to electromagnetic noise can be adopted.

As described above, the ear canal insertion handset according to each embodiment of the present invention can transmit and receive clear voice by full duplex, and can be used in the following states.

In the case where the plug-in handset according to the present invention is used in a handset consisting of a microphone and a speaker of a portable telephone, the talk and sign operation is performed with background noise having a high sound pressure level such as on a train, in a factory, and on a highway construction site Even in a full environment.

When the two-way communication unit 3 and the two-way communication unit 5 are formed integrally to be used as a wireless second telephone of a normal telephone, the second telephone is in a pocket and the ear piece is inserted in the ear, that is, the hands are free. In the state that the call is made, the housewife allows you to talk on the phone while doing housework without picking up the second phone in the house, and can also be used as a sound monitor, interphone, home sound monitor for infants, persons in need of protection, etc. .

In addition, a great advantage can be obtained by using the handset apparatus according to the present invention as a communication system for communication using a head set normally to generate emergency instructions and commands, where freedom of call and freedom of operator limbs are obtained. Call clarity in particular is required for telephone guidance, waiting for police and fire departments to respond to emergency communications, air control towers, and the like.

In addition, the error input of speech recognition can be reduced by using the earplug handset according to the present invention for inputting speech into a computer application.

An inset-embedded handset of a full duplex system according to the present invention includes an electrical signal for applying an electrical signal based on an ear piece, an acoustic conversion element, an impedance element, and a first audio signal to a series circuit of the acoustic conversion element and the impedance element. Application means, detection means for detecting a voltage across the sound conversion element, analog / digital conversion means for converting an electrical signal based on the first sound signal into a digital signal, and converting a terminal signal of the sound conversion element into a digital signal Analog / digital converting means for extracting, digital signal arithmetic processing means for extracting a second speech signal from a terminal signal of an acoustic converting element based on output signals from the two analogue / digital converting means and the second speech calculated accordingly To convert the digital signal of the signal into an analog electrical signal By incorporating digital / analog conversion means, a single sound conversion element operates with conventional microphones and earphones.

Claims (9)

In the ear insertion type handset, An ear piece provided with an ear canal insert inserted into the ear canal; An acoustic conversion element provided in the bottom portion of the sound guide hole penetrating the insertion hole for converting the acoustic vibration into the electrical signal or the electrical signal into the acoustic vibration in both directions; An impedance element connected in series with an electrical circuit of said acoustic conversion element; Electrical signal applying means for applying an electrical signal based on a first voice signal to be transmitted to the ear piece wearer to a series circuit of the acoustic conversion element and the impedance element; Terminal signal detection means of an acoustic conversion element for detecting a voltage across the acoustic conversion element including a second audio signal obtained by electrically converting the voice generated by the ear piece wearer; First analog / digital conversion means for converting the electrical signal into a digital signal based on a first voice signal to be transmitted to the ear piece wearer; Second analog / digital conversion means for converting a terminal signal of the sound conversion element into a digital signal including a second sound signal obtained by electrically converting a sound generated by the ear piece wearer; Inputs two digital signal outputs from the first and second analog / digital converting means, the impedance of the sound converting element, the impedance of the impedance element connected in series to the sound converting element, the series of the sound converting element and the impedance For extracting, by digital arithmetic processing, the second audio signal contained in the terminal signal of the sound conversion element based on the first sound signal applied to the circuit and the terminal signal of the sound conversion element generated at both ends of the sound conversion element. Digital signal arithmetic processing means; And And digital-to-analog conversion means for converting a digital signal of the second speech signal that is arithmetically calculated and output by said digital signal calculation processing means into an analog electric signal. 2. The ear piece according to claim 1, wherein the ear piece comprises an impedance element, an electrical signal applying means for applying an electrical signal based on the first voice signal, and a terminal signal detection means of the acoustic conversion element for detecting a voltage across the acoustic conversion element. Apparatus comprising a. The method of claim 1, further comprising: And the electric signal applying means comprises an amplifier of the voltage floor type. 2. An apparatus according to claim 1, wherein the terminal signal detecting means of the sound conversion element for detecting the voltage across the sound conversion element is made of a voltage floor type amplifier. 2. The apparatus of claim 1, wherein the first voice signal is transmitted to the ear piece and the terminal signal of the acoustic conversion element including the second voice signal is received from the ear piece and the first and second analog / digital conversions. Means, a digital signal processing means and a digital / analog converting means are provided separately from the ear piece so that electrical signals relating to the first and second voice signals are between the ear piece and the bidirectional talk unit. Wherein the device is transmitted and received via a wiring code. 2. The apparatus of claim 1, wherein the first voice signal is transmitted to the ear piece and the terminal signal of the acoustic conversion element including the second voice signal is received from the ear piece and the first and second analog / digital conversions. Means, a digital signal processing means and a digital / analog converting means are provided separately from the earpiece such that electrical ducts associated with the first and second voice signals are between the earpiece and the bidirectional sounding unit. And are transmitted and received via a wireless communication means. 7. The apparatus according to claim 6, wherein the ear piece has an impedance element, an electrical signal applying means for applying an electrical signal based on the first voice signal, and a terminal signal detecting means of an acoustic conversion element for detecting a voltage across the acoustic conversion element. And an transmitting part and a receiving part of the wireless communication means are provided in the case frame. 7. The apparatus according to claim 6, wherein said wireless communication means consists of a frequency modulation type bidirectional wireless communication means having two channels for transmitting and receiving over a weak radio wave. 7. The apparatus of claim 6, wherein said wireless communication means comprises two-way optical communication means having two channels for communicating and receiving using infrared light.