JPS6336757Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone equipped with a bone conduction handset.

Among people with conductive hearing loss, for example, those who have had their eardrum removed due to a disorder are unable to hear even if acoustic vibrations are applied through the outer ear, but bone conduction, which converts electrical signals into mechanical vibrations, Hearing is possible by transmitting vibrations to the bones of the head using a telephone receiver, and transmitting the signals to the middle ear organs of the ear.

When such a person tries to talk on the phone,
Conventionally, this type of device has been configured to detect and amplify the magnetic field from the telephone circuit using a telephone pickup and then receive the call using a bone conduction handset, so that all magnetic fields within the telephone circuit are detected. As a result, the transmitting volume is detected to be higher than the receiving volume, causing the other party's voice to be lower and your own voice to be heard louder, which may interfere with the call.
In addition, each time a call was made, the user had to install a telephone pick-up on the telephone and listen in, which was extremely troublesome and inconvenient.

Another method is to place the microphone of a commercially available bone conduction hearing aid on the air conduction receiver of a telephone and pick up and listen to the sound, but this method is also cumbersome to operate and the call quality is not very good. .

FIG. 1 is a block diagram of a conventional device, in which 1 is a telephone, 2 is a telephone pickup, 3 is an amplifier, and 4 is a bone conduction handset. A leakage magnetic flux is generated due to a communication current from the telephone circuit in the telephone 1 connected to a telephone line and in a communication state. If this leakage magnetic flux is detected by the telephone pickup 2, the telephone pickup 2 will also detect the communication current and send it to the amplifier 3.
to drive the bone conduction receiver 4. By doing this, you can listen to the content of the call, but
Since the leakage magnetic flux itself is very small, the amplifier 3 requires a large amplification degree, and also picks up external noise and amplifies it, so the S/N is low.
It is not possible to listen to a conversation with a high ratio and good clarity.

In order to solve these shortcomings, the present invention connects a frequency characteristic switching type amplifier that detects and amplifies voices to the receiving end of the telephone network, thereby enabling easy-to-hear bone conduction reception, and making it possible for ordinary people to listen. To provide a bone conduction telephone that can be switched with a normal handset so that telephone calls can be made.

The present invention will be explained in detail below using the drawings.

FIG. 2 shows an embodiment of the present invention, in which 5 is an outside line terminal, 6 is a telephone circuit, 7 is a transmitter connected to the transmitter terminal of the telephone circuit 6, 8 is an air conduction receiver, and 9 is a telephone. 10 is an amplifier, and 11 is a bone conduction receiver.

In this embodiment, when the telephone is used as an ordinary telephone, the changeover switch 9 is turned to the side of the handset 8, and in that case, the signal input from the outside line terminal 5 is applied to the air conduction handset 8 through the telephone circuit 6. It will be done. In the case of a bone conduction telephone, the switch 9 is moved to the amplifier 10 side, and the signal input from the outside line terminal 5 passes through the telephone circuit 6 and is amplified by the amplifier 10, and the output electrical signal is sent to the bone conduction receiver 11. Added. By adopting such a configuration, the electrical signal entering the amplifier 10 can have a sufficiently large S/N ratio compared to the conventional example shown in FIG. Further, the configuration of the amplifier 10 may be simple. In addition, since the electrical signal is extracted from the receiver terminal of the telephone circuit 6, sufficient sidetone attenuation can be obtained, eliminating unnaturalness in calls, and even people with severe conductive hearing loss can communicate as well as normal people. You can make calls with high quality.

FIG. 3 shows another embodiment of the present invention, in which 5 is an outside line terminal, 6 is a telephone circuit, 12 is an amplifier, 13 is a microphone, 8 is an air conduction receiver, 9 is a changeover switch, 10 is an amplifier, and 11 is a bone It is a conductive receiver.
In this embodiment, the microphone 13 converts air vibration into an electrical signal, and the signal is amplified by the amplifier 12 to become a transmission signal. The receiving signal from the outside line terminal 5 is applied to the bone conduction receiver 11 in the same manner as described in the embodiment of FIG. Here, since the bone conduction receiver 11 converts an electrical signal into solid vibration, the microphone 1
3 is hardly detected. Unlike a hands-free telephone that uses a normal microphone and speaker, it is possible to easily construct a hands-free telephone by configuring it as shown in FIG. 3 without adding any control to prevent howling.

Figure 4 also shows another embodiment of the present invention. In Figure 4, the same numbers as in Figure 2 indicate the same or equivalent parts, 7a is a transmitter, 9a is a changeover switch, and a is a switch. The air conduction handset, b, is a bone conduction phone handset. In contrast to the embodiment shown in FIG. 2, in which only the receiving system is switched, in this embodiment, an additional transmitter 7a is provided, and this is integrated with the bone conduction receiver 11. This is a type handset and is configured so that it can be switched between handset a and handset b by operating a changeover switch 9a. That is, by allowing a person with normal hearing to use the handset a and a person with hearing loss to use the handset b, the person with a hearing loss can use the handset in a state (posture) similar to a normal conversation, which is very useful as it eliminates the hassle.

FIG. 5 shows a specific example of the amplifier 10, in which the output from the receiver terminal is amplified and outputted to the bone conduction receiver 11 via the amplifier 10-1, but the constant of the negative feedback element of the amplifier 10-1 can be changed by the switch S. Accordingly, the auditory frequency characteristics can be switched as shown in FIG. Therefore, it is now possible to receive calls that match the frequency characteristics of people with hearing loss.

For example, frequency characteristics that are easy for users to hear can be obtained in case of F in FIG. 6 for people with normal hearing loss, and in case of H in FIG. 6 for people with hearing loss due to old age. In case of S-1, it is H, in case of S-2, it is F, and in case of S-3, it is L.

FIG. 7 shows an example of the internal configuration of a ripple filter circuit preferably used for the power supply of the amplifier 10, in which 21 is a resistor, 22 is a capacitor, 23 is a transistor, 24 is an input terminal, 25 is an output terminal,
26 is a diode. In such a configuration, when power is applied to the input terminal 24, the resistor 21 starts charging the capacitor 22 in the initial state;
Approximately the same voltage as the power supply voltage applied to 4 is applied. Therefore, by selecting a diode 26 that becomes conductive at a voltage slightly larger than the voltage appearing across the resistor 21 in the steady state of the circuit, the diode 26 becomes conductive in the initial state, and the resistance is higher than that of the resistor 21. The operating resistance of the diode 26 is much smaller, the time required to charge the capacitor 22 is shortened, and the time it takes for a steady state output to appear at the output terminal 25 after power is applied is extremely short. Furthermore, in a steady state, only a voltage lower than the operating voltage is applied to the diode 26, so it becomes non-conductive and the operating resistance of the diode 26 approaches infinity, which does not affect the ripple reduction effect.

Further, a Zener diode is suitable as the diode 26, but a plurality of ordinary diodes connected in series may also be used. However, in the latter case, the polarity is opposite to that in the former case.

As explained above, the present invention allows high-quality bone conduction reception with a simple amplifier, and normal calls can be made with the switch 9. Therefore, people from normal hearing to people with severe hearing loss can receive calls without any problems under normal usage conditions. There are effects that can be used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram including a perspective view showing an example of a conventional device, FIGS. 2, 3, and 4 are block diagrams showing an embodiment of the present invention, and FIG. 5 is a block diagram of an amplifier 10 used in the present invention. 6 is a characteristic diagram for explaining an example of the characteristics of the amplifier shown in FIG. 5, and FIG. 7 is a circuit diagram showing an example of a ripple filter circuit suitable for use in the device of the present invention. be. 1...Telephone, 2...Telephone pickup, 3, 10, 12...Amplifier, 4, 11...Bone conduction handset, 5...Outside line terminal, 6...Telephone circuit, 7, 7'...Talking Container, 8... Air conduction receiver, 9
...Selector switch, 13...Microphone, a...
... Air conduction handset, b... Bone conduction telephone handset, 2
1...Resistor, 22...Capacitor, 23...Transistor, 24...Input terminal, 25...Output terminal, 26...Diode.

Claims (1)

[Scope of utility model registration request] a bone conduction handset; an amplifier for amplifying an input electrical signal to the bone conduction handset with an amplification frequency characteristic switched to suit the auditory frequency characteristics of the user and applying the amplified signal to the bone conduction handset; , a switch for electrically switching and connecting the handset terminal of the telephone circuit to the signal terminal of the air conduction handset or the electrical signal input terminal of the amplifier; A bone conduction telephone configured to enable bone conduction reception.