KR100630570B1 - FM Radio for hearing aid - Google Patents

Abstract

The present invention is to make the FM radio for hearing aids by adding a hearing aid function as a representative to the small FM radio. The radio consists of a broadcasting wave frequency amplifier (RF), a local oscillator (Osc), a mixer (Mixer), an intermediate frequency amplifier (IF), a detector, a voice amplifier 26, an earphone 27, a speaker 33, and the like. The speaker 33 of this radio is separated from the audio output of the radio and used as the dynamic microphone 1.

"Tin"

The structure of a dynamic speaker is a cylindrical type mounted in a magnetic field by a permanent magnet.

Moving coil is bonded to speaker diaphragm

When a current is flowed, a magnetic field is generated, pushing against each other with the magnetic field of the permanent magnet.

When the movable coil is moved, the close-up diaphragm vibrates and vibrates for sound.

When using such a dynamic speaker as a microphone, the effect of the diaphragm is small.

When the sound pressure is received, the diaphragm vibrates and joins at the strength.

Electromotive force is generated by the magnetic field of the permanent magnet.

Take advantage of the dynamic microphone.

In order to increase the sound picked up by the dynamic microphone 1, the ultra-short microphone amplifier 25 is designed in two stages, and at the output thereof, the filter capacitors 5 and 6 are connected to both ends of the filter resistor 14 and grounded. This attenuates the gain of the high end of the voice band so that extraneous noise in this band interferes with the perceived language understanding. The radio signal and the hearing aid signal are installed by switching to a separate switching switch 20 to be connected to the input of the original radio volume 21 to listen to the sound through the earphone 27 via the voice amplifier 26. By selecting earphones with good sound quality, FM radio with high quality hearing aid function is composed of small amount of parts, so it can be supplied to elderly patients with hearing loss at low price.

Dynamic Microphone, Ultra Short Microphone Amplifier, Voice Amplifier, Feedback, Distortion, Sound Pressure Sensitivity, Frequency Characteristics, Switch,

Description

FM Radio for hearing aid

Figure 1: Radio perspective

2nd Stage: Ultra Short Microphone Amplifier

Figure 3: Diagram
4th: Speaker diaphragm shape

(1) -dynamic microphone (16) -output load resistance

(2) -coupled capacitors (17)-dicapering resistors

(3) -coupled condenser (18) -dicapering resistor

(4) -coupled capacitor (19) -emitter bypass capacitor

(5) -filter condenser (20) -function switch

(6) -Filter Capacitor (21) -Volume

(7)-Biped Capacitor (22)-Power Batteries

(8)-Biped Capacitor (23)-Power Switch

(9) -feedback capacitor (24) -radio ICs

(10) -feedback capacitor (25) -micro microphone amplifier

(11)-Magnetic Bias Resistor (26)-Voice Amplifier

(12)-Magnetic Bias Resistor (27)-Earphone

(13) -Emitter Resistance (28)-Ultra Short Transistor (TR)

(14) -Filter Resistance (29) -Output Transistor (TR)

(15)-Ultra Short Load Resistance (30)-Antenna

(31) -Auto Scan (32) -Reset (33) -Speaker

The present invention relates to an FM radio for hearing aids in which a hearing aid function is added to an existing FM radio. The FM radio is a super heterodyne receiver, and an FM broadcast wave amplifier (RF) and a local oscillator (OSC). ), Mixer, intermediate frequency amplifier (IF), detector, voice amplifier (26), earphone (27), speaker 33, but FM broadcast wave amplifier (RF), local oscillator (OSC) Mixer, intermediate frequency amplifier (IF), detector, broadcast auto-scan (31) and reset (32) functions in one radio IC (24) Since the mounting volume is small, the FM radio for hearing aids can be made small. The voice amplifier 26 has a B-level amplification at the end of the transistor, so that the output is large and the battery consumption is low when there is no output. Pick up the amplifier and amplify it with an ultra-short microphone amplifier 25 composed of transistors, and output the signal to a volume 21 by selecting one of a radio signal and a hearing aid signal using the function switching switch 20. Adjust the amplification back to the voice amp (26) to listen to the sound with the earphone (27). Referring to FIG. 2, the ultra-short microphone amplifier 25 will be described with reference to the power supply anode so that the signal does not interfere with the positive power between the transistor 28 and the amplifier of the transistor 29. Configure the decaupling circuit with the pull resistor (18) connected and grounded with the bypass capacitor (8) to connect the output load resistor (16) and again with the decapooling resistor (17) and the bypass capacitor (7). By constructing a pulling circuit to connect the ultra-short load resistor (15) to prevent the mutual interference between the amplifiers to stabilize the amplifier. The two amplification transistors are class A amplifiers, which are self biased, which connect a large value of resistance between the base and the collector of a transistor. This is a voltage distribution bias. In addition to the advantages of the method, the battery consumption is low, and an appropriate amount of feedback capacitors 9 and 10 is provided at both ends of the magnetic bias resistance 11 and 12. When connected, the amplifier can be operated simply as a feed-back amplifier to improve distortion and noise factor. The output of the ultra-short microphone amplifier 25 is transistor 29. The coupling capacitor (4) and the filter resistor (14) are connected in series at the corrector of the filter and are connected to the function switching level (20). The filter capacitor (5) (6) Ground) to attenuate the gain of the high range of the audio band, Future noise and weak dialogue (對話) understand (理解)) to interfere (妨害) disorder (障碍). For hearing aids, the gain of the entire sound range is as small as 300 Hz or less at an audible frequency, and high for 1,000 Hz, 2,000 Hz, and low for more than 3,000 Hz to reduce external and high frequency noise. It can be suppressed, and it is easy to understand a listening language. Therefore, the value of the coupling capacitors 2, 3, and 4 is made small so that the gain of the low range of the voice band is not excessive. The time constant of the emitter resistor 13 and the emitter bypass capacitor 19 reinforces the gain in the middle region of the audio band and filters the filters. The filter circuit of the resistor 14 and the bypass capacitor 5 and 6 reduces the gain of the high range. The output load resistors (15) and (16) are selected to match the values in class A amplification so that the distortion is low.
And, of course, the dynamic microphone 1 can be replaced by a small condenser microphone in order to reduce the size of the component mounting of the FM radio for hearing aids. At this time, after removing the dynamic microphone 1 from the ultra-short microphone amplifier 25, connect the negative electrode of the condenser microphone to the ground and connect the positive electrode to the + line of the coupling capacitor 2. When a suitable amount of microphone load resistance is connected between the + line of the bypass capacitor (7) and the condenser microphone, the condenser microphone operates, and the built-in dynamic microphone (1) or The condenser microphone may be detached from the FM radio body for hearing aids and connected to a long line to be external.
The development of hearing aids continued as humans suffered hearing loss and aging due to various factors. In the early days, it started with a method of collecting sound by holding a fallopian tube-shaped object as a mechanical structure. With the development of electronic technology, in the vacuum tube era, microphones and tubes made of carbon powder were used to make hearing aids that were difficult to carry, and since the transistor was invented, its volume became smaller and put in a pocket. Neck-shaped things are made, and in recent years, due to the development of complex ICs, the volume is smaller, and analog hearing aids are commonly used as earring-type and ear-type hearing aids. have. Recently, the performance of digital hearing aids has also come out, but the performance has been greatly improved, but the high price makes it difficult to popularize hearing aids.

Humans have visual and hearing impairments due to aging, acquired thinking, or birth defects. In the case of visual impairment, eyeglass surgery can be supplemented by eyeglass surgery or surgical operation, and hearing loss is generally supplemented by hearing aids. However, they are reluctant to wear hearing aids and are psychologically conscious of the eyes of others. For this reason, they tend to prefer very small hearing aids that can hide their ears deeply rather than large earring-type hearing aids. However, since a large number of parts are integrated in a limited size, a high-performance, high-quality product is put in a lot of parts, so the microphone picking up the sound and the speaker making the sound are close to each other so that the sound is easily fed back. ) do. Therefore, these hearing aids are expensive, but their performance is somewhat lower than that of earring-type hearing aids having a large component mounting area.
In consideration of the user's convenience and psychology, the present invention improves dynamic microphone sound detection characteristics for the purpose of manufacturing high quality hearing aids, and selects high quality earphones to faithfully reproduce language sounds with a high quality ultra short microphone amplifier. do. During the conversation, music, entertainment, and news are broadcasted through FM radio. During conversations, the signal of the micro-talker is picked up and amplified by the ultra-microphone amplifier 25 by the function switch 20. A selector is sent to the radio Volume 21 input. Then, the earphone 27 can hear the voice amplified again by the voice amplifier 26 at a suitable volume with the volume 21. Therefore, people around you know by listening to the radio, but do not know how to use the hearing aid, free from psychological factors that are reluctant to use the hearing aid. This is a great advantage to completely conceal the use of hearing aids, making a small amount of parts to make a cheap FM radio for hearing aids.

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FM radio is a super heterodyne receiver. FM broadcast, local oscillator (OSC), mixer (Mixer), intermediate frequency amplifier (IF), detector, voice amplifier (26), earphone (27), speaker 33, but FM broadcast wave amplifier (RF), local oscillator (OSC), mixer (Mixer), intermediate frequency amplifier (IF), detector, automatic selection of broadcast waves (Auto-Scan (31) and Reset (32) functions are built into one radio IC (24).
Hearing aid function picks up the sound by using the speaker 33 embedded in the radio as a dynamic microphone and amplifies it with an ultra-short microphone amplifier 25 composed of transistors, and outputs the radio signal to a function switching switch 20. Select one of the hearing aid signals and adjust the volume (21) to amplify the audio amplifier (26) and listen to the sound with the earphones (27). Its small volume makes it easy to manufacture FM radios for small hearing aids. Referring to FIG. 2, the MIC 25 will be described with reference to FIG. In order to prevent the signal from interfering with the positive power between the amplifiers, a decapturing circuit is connected to the power positive pole and grounded by a bypass capacitor (8). Connect the resistor (16), and then decaupling resistor (17) and the bypass capacitor (7) to form a second decaupling circuit and connect it to the super short load resistor (15) to prevent mutual interference between the amplifiers to stabilize the amplifier. . The two amplification transistors are class A amplifiers, which are self biased, connected between the base and the collector of the transistor with a large value of resistance. In addition to the advantages of the method, the battery consumption is low, and an appropriate amount of feedback capacitors 9 and 10 is provided at both ends of the magnetic bias resistance 11 and 12. When connected, the amplifier can be operated as a feed-back amplifier to improve distortion and noise factor. The output of the ultra-short microphone amplifier 25 is connected to the function switching switch 20 in which the coupling capacitor 4 and the filter resistor 14 are connected in series at the corrector of the transistor 29. (I) Grounding with an appropriate amount of filter capacitors (5) and (6), attenuates the gain of the high range of the audio band. For hearing aids, the gain of the entire sound range is as small as 300 Hz or less at an audible frequency, and high for 1,000 Hz, 2,000 Hz, and low for more than 3,000 Hz to reduce external and high frequency noise. It can be restrained, making it easier to understand language when using hearing aids around our lives. Therefore, the value of the coupling capacitors 2, 3, and 4 is made small so that the gain of the low range of the voice band is not excessive. The time constant of the emitter resistor 13 and the emitter bypass capacitor 19 reinforces the gain in the middle region of the audio band and filters the filters. Filter circuit of resistor (14) and bypass capacitor (5) (6) reduces high gain
The output load resistors (15) and (16) are values that form a summation in class A amplification.
(4) Select so that the distortion is low.
The built-in speaker 33 is a diaphragm shaped plate made of one-piece compact synthetic resin, and has a wavy concave-convex along the circumference of the edge to soften the vibration. I found that the texture was hard. When I used this as a microphone, the sound was hard and the sound sensing characteristics were unsatisfactory. Thus, as shown in Fig. 4, "Speaker diaphragm shape" picture, the left and right white parts B are melted by the soldering iron tip and cut out in an appropriate amount, and the upper and lower black A are cut off the edges of the remaining speaker diaphragm. The vibration of the improved diaphragm is very soft, and the sound sensing characteristic is greatly improved. The speaker thus processed is used as a dynamic microphone (FM) for high-quality hearing aids. To complete.
And, of course, the dynamic microphone 1 can be replaced by a small condenser microphone in order to reduce the size of the component mounting of the FM radio for hearing aids.
At this time, after removing the dynamic microphone 1 from the ultra-short microphone amplifier 25, connect the negative electrode of the condenser microphone to the ground and connect the positive electrode to the + line of the coupling capacitor 2. When the proper amount of microphone load resistor is connected between the + and + wires of the bypass capacitor (7), the condenser microphone is activated.
In addition, in order to further reduce the mounting volume, the built-in dynamic microphone 1 or condenser microphone can be detached from the FM radio body for hearing aids and connected to a long line to be external. have.

  Normal hearing aids require approximately six weeks of adaptive training before they are used for habitual use, because the sound of the hearing aids differs from the tone of our language and the noise is caused by noisy extraneous noise. To avoid car noise, you can't help but pick up the noise in our surroundings unless you have your hearing aid unplugged.

However, FM radio users for hearing aids enjoy listening to broadcasts such as music, entertainment, and news in high-noise places, and use hearing aids only during conversations, so that they can avoid the noise of everyday life and plug earphones into one ear. Or plug it into both ears, you can use freely. One of the greatest advantages of FM radio for hearing aids is that it can be completely concealed by disguising the use of hearing aids as radio hearing. Since the speech sound of our voice band is faithfully reproduced, no additional adaptive training is required from the first use, and hearing aid and radio function switching can be quickly and conveniently switched to hearing aid-> radio-> hearing aid-> radio. It is a repetitive contact type switch with a small amount of parts, so it is easy to spread because of its low cost. It's easy to handle because it fits in your waistband, hangs around your neck, or fits into your pocket.

Claims (3)

       In the FM radio for hearing aids, part of the left and right sides of the diaphragm frame of the existing speaker 33 built in the super heterodyne FM radio is opened. By using a dynamic microphone (1), which has been melted and cut out to improve sound sensing characteristics, an ultra-short microphone amplifier composed of transistors is used to prevent mutual interference of amplified signals by two decapturing circuits. A sharp increase in the bias (Self_Bias) method. The output signal of the transistor 29 is inserted through the coupling capacitor 4, and a filter for attenuating the high range of the voice band is inserted between grounds to suppress foreign noise to facilitate language understanding and to switch between one of the radio signal and the hearing aid signal. FM radio for hearing aids, characterized in that by selecting the switch (20) to adjust the volume (21) to amplify again with a voice amplifier (26) to listen to the sound with earphones (27) FM radio for hearing aid which replaces the dynamic microphone 1 of Claim 1 with a small condenser microphone, and makes small parts mounting volume. The FM microphone for hearing aids having a small volume of parts mounted outside the radio body by connecting the dynamic microphone 1 of claim 1 and the condenser microphone of claim 2 in a long line.

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