WO2003015465A1 - Ear-integrated telephone transmitter and receiver with high suppressed feedback - Google Patents

Abstract

An integrated ear-mounted transmitter and receiver which is used in a communication and having high suppressed feedback, comprises: transmitter unit (10) which is composed of transducer (11), protrusion-like pickup piece (12) and sound processing circuit (13); receiver unit (20) which is composed of speaker (21) and sound-transfer tube (22) connected with it; housing (30) accommodated to ear duct-type and wire (40) connected with transmitter unit and receiver unit, characterized in that transmitter unit (10) and receiver (20) are isolated by high damping material, and at least transmitter and housing are isolated by high damping material; a part of protrusion-like pickup piece protrudes from hole (31) of housing (30), and protrusion-like pickup piece is isolated with hole wall. Present invention reduces the vibration signal from receiver unit since vibration damping capability of high damping material, and reduces effectively feedback of duplexing work, so it can preferably eliminate howling and echo, reduce noise signal, improve sound quality and carry confortly.

Description

 Integrated ear canal transmitter and receiver with high suppression feedback

 The present invention relates to communication transmitters and receivers, and in particular to an ear canal-type integrated transmitter and receiver with high suppression feedback for duplex communication. Background technique

 As portable computers and communication terminals become more and more widely used, related pickup microphones with high noise resistance and small size will also be more widely used. Pick-up microphones are also called bone-conducting microphones. Their working principle is: When a person speaks, when the vocal cords vibrate and emit sound waves, they also cause vibrations in human tissues. The vibration pickup sensor picks up these vibrations as a source of acoustic signals. Since the vibration pick-up sensor is not sensitive to the sound waves in the surrounding air medium, but is more sensitive to the vibration of the human tissues in contact with it, the vibration pickup microphone has better resistance to environmental noise. According to the difference of human body parts picked up by vibration, the pick-up microphone type is further divided into the head type, the throat type, and the ear canal type. Overhead and laryngeal knots are often used in military and police departments. Their main disadvantage is that they are neither beautiful nor convenient to wear. Among them, the laryngeal knot microphone is pressed against a person's neck, so wearing it for a long time will cause users Overhead microphones are infrequently used because of the need to wear a helmet.

In order to overcome the shortcomings of the above-mentioned pick-up microphones, people have developed ear canal microphones, which better solve the above problems. The vibration pickup point of the ear canal microphone is in the human ear canal, and thus the microphone and the receiver can be integrated into the ear canal and thus have both functions of listening and speaking. The applicant disclosed in the Chinese invention patent 98106573 an above-mentioned ear canal transmitter and receiver. The subject matter of the invention is "integral ear canal transmitter and receiver with vibration pickup". The shell made of adaptable soft material and the vibration type microphone and receiver connected with the wire Among them, the vibrating microphone uses piezoelectric ceramics as a sensor, and a cantilever beam structure is used to fix the fixed end on the rear end of the sensor. A mass block (weight) is provided on the front end of the sensor to amplify the signal, and the sensor converts the vibration signal An electrical signal is output and processed by an impedance matching circuit. The exterior of the sensor is a housing, and a vibration confirmation notebook is provided on the housing. Signal convex pick-up block. The sensor, the fixed end, the weight, the impedance matching circuit, the housing, and the convex vibration pickup block together form a microphone assembly.

 The biggest feature of the above-mentioned transmitter and receiver is that the signal is mechanically processed, which greatly improves the sound quality. Because when people talk, the vibration of the human tissue caused by the vocal cord vibration will propagate in all directions, and thus reach different parts of the ear canal in different directions, and the vibration phase is also different. If all of them are received, a mixing will occur, making the The sound quality and recognition are not good. The convex vibration pickup block is made of hard material, so that the vibration signal of the vibration pickup part in the ear canal can be transmitted as much as possible, and the shell is made of soft material. Since the soft material has the effect of reducing vibration, it can make other parts The incoming signal is weakened as much as possible, so that the sound quality of the sound is high and the distortion is small. At the same time, since the vibration pickup and the receiver are put together, in the state of Chinese workers who are talking and listening at the same time, the vibration emitted by the receiver when it is uttered will be picked up by the vibration pickup, which will generate feedback, resulting in echo or even howling during a call It appears that the ability of the shell made of soft material to dampen vibration can also play a role in suppressing feedback. In addition, the shell made of soft material has better adaptability to people's ear canals of different sizes, and can also make it comfortable to wear.

 However, it has been found in practice that if the ear canal type / receiver is to be widely and hardly applied, there are still some problems that need to be solved, and the specific manifestations are:

 1. The damping ability of the soft material used as the shell is limited, so that the shell's ability to suppress feedback is also very limited. In the duplex state, echoes often occur;

 2. For the same reason, while the vibration pickup is working, although the signals in other parts can be weakened as much as possible, there will still be interference signals coming in, thereby reducing the sound quality;

 3. The elasticity of the shell made of soft material is limited. When the ear canal of the user is small, it cannot fully adapt, and it will make the user uncomfortable.

 The occurrence of the above problems indicates that the existing software materials have a limited ability to attenuate vibrations, and that the use of software materials alone cannot solve the above problems. Summary of the Invention

The present invention is to solve many problems existing in the existing ear canal type transmitter and receiver, and provides an ear canal type integrated transmitter and receiver having high suppression feedback ability. ■ The ear canal type integrated microphone and receiver with high suppression feedback of the present invention includes a microphone component composed of a sensor, a convex vibration pickup and a sound processing circuit, and a microphone component composed of a speaker and a sound tube connected to the microphone component. A housing adapted to the shape of the ear canal, and a wire connected to the microphone component and the microphone component, characterized in that the microphone component and the microphone component are separated by a high-damping material, and at least the microphone and the casing are also It is separated by the high damping material; a part of the convex vibration pickup block protrudes from the hole on the housing, and the vibration pickup block and the wall of the hole are kept in an isolated state.

 The high-damping material uses foam plastic or foam rubber

 The shell is a thin shell made of a silicon-based polymer material.

 The contribution of the present invention is that, because the highly damping material is used as the filling material, it not only plays a role of fixing the components of the transmitter and the receiver, but also more importantly, isolates the components from each other by the highly damping material, and through its good vibration reduction The performance reduces the vibration signals from the receiver and the sound pipe as much as possible, effectively suppressing the feedback during the duplex operation, so that howling and echo can be better eliminated. Because the microphone is isolated from the housing with a high-damping material, the transmission of interference signals can be minimized to improve the sound quality. Also, because the high-damping material used has a good deformation ability, the protruding height of the convex vibration pickup can be adaptively adjusted according to the shape of the ear canal, making it more comfortable to wear. In addition, since the shell is made of silicone and similar materials, the shape is determined, the surface of the shell is smooth, and the affinity with human tissue is good, so it is comfortable to carry. BRIEF DESCRIPTION OF THE DRAWINGS

 FIG. 1 is a schematic diagram of the present invention.

 Fig. 2 is a sectional view of a structure of the present invention.

 FIG. 3 is a schematic structural diagram of a microphone component of the present invention.

 FIG. 4 is a schematic structural diagram of a receiver assembly according to the present invention.

 Fig. 5 is a perspective view showing the structure of the present invention. detailed description

 The invention is further described below with reference to the drawings and preferred embodiments.

Referring to FIG. 2 to FIG. 5, the ear canal integrated receiver and receiver with high suppression feedback of the present invention includes The microphone assembly 10, the microphone assembly 20, the housing 30, and the wire 40, wherein the microphone assembly 10 is composed of a sensor 11, a convex vibration pickup block 12, and a sound processing circuit 13. The sensor is a piezoelectric ceramic sensor, which is longitudinally disposed on the Inside the casing, one end is fixed, and is connected to the lead wire 40 after the sound processing circuit 13, and the other end is a free end, forming a cantilever beam structure. A mass (weight) can be provided at the cantilever end 14, so that the amplitude can be increased to amplify the signal . The front end of the convex vibration pickup block 12 protrudes from the hole 31 on the casing 30, and directly contacts the ear canal to pick up the vibration signal. The vibration pickup is made of a hard material to effectively transmit vibration. The sound processing circuit 13 is an impedance matching circuit. One end of the sound processing circuit 13 is connected to a fixed end of the sensor, and the other end is connected to an external device through a wire 40. It is output via the lead 40. The receiver assembly is composed of a field speaker 21 and a sound guide tube 22 connected thereto. The speaker 21 is a miniature speaker, which is arranged laterally at the top end of the casing and is connected to external equipment through a wire 40. In order to export the sound of the loudspeaker, a sound guide tube 22 is connected to the loudspeaker, which extends to the front outlet of the transmitter and receiver, and can export the voice received from the loudspeaker to the ear canal of the user. Said shell 30 is a thin shell made of a silicon-based polymer material, such as silica gel, and the shape is adapted to the shape of the human ear canal. The shell made of such materials has a smooth surface and affinity with human tissues. Good sex, non-toxic, strong material and so on. A hole is provided at the end of the casing for the wire to pass through, and the other end is also provided with a hole for transmitting the sound sent by the sound guide tube. A lateral middle portion of the casing is provided with a protrusion for the convex vibration pickup block 12 to protrude.孔 31。 Hole 31. One end of the wire 40 is connected to the microphone component and the receiver component, and the other end is connected to an external device for transmitting signals.

The above structure is basically the same as the prior art, and the gist of the present invention is to overcome the problem that in a duplex state in which speaking and listening are performed at the same time, the vibration emitted by the receiver when it is sounded is picked up by the vibration pickup, so that feedback is generated, resulting in There is a problem of echo or even howling. In the present invention, the microphone assembly 10 and the microphone assembly 20 are separated by a high damping material 50. At the same time, in order to minimize the introduction of external interference signals and improve the sound quality, it is necessary to at least send the microphone The microphone and the housing are also completely separated by the high damping material 50. The receiver assembly may or may not be separated from the housing by a highly damping material. The high damping material is the key to solving the problem, it should have good vibration damping performance and deformation ability, and it should also have slow rebound characteristics to adapt to different ear canals and extend its service life. This high-damping material can be selected from foam plastics, such as polyvinyl chloride foam, polystyrene foam, and urea foam Polyfoam, polyurethane foam, etc. are preferred in this example. Foam rubber, which is a vulcanized rubber with a sponge-like porous structure, can also be selected. You can choose the right commercially available product according to your needs. During implementation, the above-mentioned high damping material may be filled between the microphone component and the microphone component, and between the microphone component and the casing, so as to reduce vibration and fix components. Another important point of the present invention is that the convex portion of the convex vibration pickup block protrudes from the hole 31 on the housing 30. In order to prevent the outer edge of the vibration pickup block from coming into contact with the wall of the hole, noise may be generated. It is kept away from the wall of the hole. The measure is to make the diameter of the hole 31 in the housing 30 larger than the external size of the convex pickup block, and also use a high damping material between the edge of the hole 31 and the convex pickup block. Separated.

 The ear canal transmitter and receiver have better sound quality, are more convenient and comfortable to wear, and the most important thing is that there is basically no echo, which can meet the requirements of civil duplex communication.

Claims

Claim 1. An ear canal type integrated microphone and receiver with high suppression feedback for communication, comprising a microphone component (10) composed of a sensor (11), a convex vibration pickup (12), and a sound processing circuit (13) ), A receiver assembly (20) composed of a speaker (21) and a sound guide tube (22) connected thereto, a casing (30) adapted to the shape of the ear canal, and a wire (connected to the microphone assembly and the microphone assembly) 40), characterized in that the microphone component (10) and the microphone component (20) are separated by a high damping material (50), and at least the microphone and the housing are also separated by the high damping material (50); A part of the convex vibration pickup block (12) protrudes from the hole (31) on the casing 0), and the vibration pickup block and the wall of the hole are kept in an isolated state.  2. The high-noise earphone type receiver and receiver according to claim 1, wherein the high-damping material (50) is foam plastic or foam rubber.  3. The high-noise earphone-type earphone and receiver according to claim 1, wherein the casing (30) is a thin shell made of a silicon-based polymer material.