CN2096168U - Radio receiver for tv sound - Google Patents
Radio receiver for tv sound Download PDFInfo
- Publication number
- CN2096168U CN2096168U CN91213114.4U CN91213114U CN2096168U CN 2096168 U CN2096168 U CN 2096168U CN 91213114 U CN91213114 U CN 91213114U CN 2096168 U CN2096168 U CN 2096168U
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Abstract
一种电视音响无线接收机，由于拾音插孔输出的 发射装置及包括小型扬声器的接收装置组成，发射装 置为经过一匹配阻抗至发射导线，接收装置为经过感 应线圈耦合电磁信号，感应线圈信号输至前级信号放 大器、带通放大器及功放输至扬声器。本实用新型结 构简单，成本低，使用可靠。
A TV audio wireless receiver is composed of a transmitting device output by a pickup jack and a receiving device including a small speaker. The transmitting device passes through a matching impedance to the transmitting wire, and the receiving device couples an electromagnetic signal through an induction coil, and the induction coil signal Output to pre-stage signal amplifier, band-pass amplifier and power amplifier to speaker. The utility model has the advantages of simple structure, low cost and reliable use.
Description
本实用新型涉及电视音响的无线接收机的制作。The utility model relates to the manufacture of a wireless receiver for television audio.
现有的电视音响的无线传输和接收，尤其用于电视伴音的无线接收装置常采用下述设计：一种为无线电波调制发射和解调接收，另一种为红外线调制发射和解调接收。上述两种装置均需要调制发射装置和外加电源（电视机内部电源不能直接利用），接收机需要选频解调电路。而且红外线极易遮挡的，只要光路受阻，声音立即中断。此外，这两种装置结构复杂，成本高达数十元。无线电波调制发射和接收装置容易导致相邻使用时信号互相干扰。The existing wireless transmission and reception of TV audio, especially the wireless receiving device for TV audio, often adopts the following designs: one is radio wave modulation transmission and demodulation reception, and the other is infrared modulation transmission and demodulation reception. Both of the above two devices need a modulation transmitter and an external power supply (the internal power supply of the TV cannot be directly used), and the receiver needs a frequency-selective demodulation circuit. Moreover, infrared rays are easily blocked. As long as the optical path is blocked, the sound will be interrupted immediately. In addition, the structures of these two devices are complicated, and the cost is as high as tens of yuan. Radio wave modulation transmitting and receiving devices are likely to cause mutual interference of signals when used adjacently.
本实用新型目的是为了克服上述装置的不足，制造一种成本低、结构简单、使用方便可靠、又无干扰的无线接收机，尤其适用于与电视机配套。The purpose of the utility model is to overcome the shortcomings of the above-mentioned device, and manufacture a wireless receiver with low cost, simple structure, convenient and reliable use, and no interference, especially suitable for matching with a TV set.
本实用新型的技术解决方案是：利用电视音响设备的本身音频能量，输至发射装置，从拾音插孔的输出经过一匹配阻抗后接发射导线，接收装置为经过感应线圈耦合音频电磁信号，感应线圈信号输至前级信号放大器，并经过带通放大器及功率放大器后输至扬声器发音。一前级放大器及带通放大器均由运算放大器以负反馈放大方式构成。一级前级带通放大器是实现信号放大的起码放大级，当耦合输入信号弱时可增加一级前级或带通放大。发射装置的匹配阻抗是一只小电阻或者再与电阻并联二电容。发射导线接出几米即可。The technical solution of the utility model is: use the audio frequency energy of the TV audio equipment itself to transmit to the transmitting device, the output from the pickup jack is connected to the transmitting wire after a matching impedance, and the receiving device is to couple the audio electromagnetic signal through the induction coil, The induction coil signal is output to the pre-stage signal amplifier, and then output to the speaker for sounding after passing through the band-pass amplifier and the power amplifier. A preamplifier and a band-pass amplifier are both composed of an operational amplifier in a negative feedback amplification manner. A pre-stage band-pass amplifier is the minimum amplification stage for signal amplification. When the coupling input signal is weak, a pre-stage or band-pass amplifier can be added. The matching impedance of the transmitter is a small resistor or two capacitors connected in parallel with the resistor. The launch wire can be extended a few meters.
本实用新型实现音频电磁感应在无线接收机上的应用，大大简化了发射及接收装置，经过足够的带通放大使得输出足够清晰的声音，不需要选频及解调电路，使制作成本大为降低，由于声频磁场频率低，衰减快，不会与附近相同装置产生互相干扰。与电视配用时，电视机无声音输出，要听声音者打开接收机，通过耳机收听。也可以用于音响、收录机。The utility model realizes the application of audio frequency electromagnetic induction on the wireless receiver, greatly simplifies the transmitting and receiving devices, enables the output of clear enough sound through sufficient band-pass amplification, does not require frequency selection and demodulation circuits, and greatly reduces the production cost , due to the low frequency and fast attenuation of the audio frequency magnetic field, it will not interfere with the same nearby devices. When used with a TV, the TV has no sound output, and those who want to listen to the sound turn on the receiver and listen through the earphones. It can also be used for stereos and tape recorders.
以下结合附图通过实施例对本实用新型作进一步说明：Below in conjunction with accompanying drawing, the utility model is further described by embodiment:
图1是本实用新型框图。图2为本实用新型线路结构图。Fig. 1 is a block diagram of the utility model. Fig. 2 is a circuit structure diagram of the utility model.
图1给出了基本结构，音频发射信号经感应信号接收，经放大及功放后输至扬声器发声。其中放大部分包括前级放大及带通放大。Figure 1 shows the basic structure. The audio transmission signal is received by the induction signal, and then transmitted to the speaker for sound after being amplified and power-amplified. The amplification part includes pre-amplification and band-pass amplification.
图2中耳机插孔E通过一电阻及一并联的电容输至发射导线，电阻的阻值在4Ω至8Ω，当然视本身输出阻抗。发射导线在室内布置，以环置四围墙壁为好，感应线圈B以φ0.15线径绕300到1000圈，为增强接收的感应信号，线圈内置软磁芯运放A1为前级放大器，信号输入端与地之间接一只电容C1，其容量一般取100～500P左右，用于滤去高频信号。BG1、BG2构成功放电路，其输出端接扬声器，如果使功放电路制成小输出阻抗的功放电路则可以在一只接收机上接上多于一只耳机，用于两人或更多人使用同一套接收机。与发射电阻并联的电容为100P。In Figure 2, the earphone jack E is input to the transmitting wire through a resistor and a parallel capacitor. The resistance of the resistor is between 4Ω and 8Ω, depending on the output impedance of course. The transmitting wires are arranged indoors, preferably surrounded by walls. The induction coil B is wound 300 to 1000 times with a diameter of φ0.15. In order to enhance the received induction signal, the coil has a built-in soft magnetic core operational amplifier A 1 as a pre-amplifier. A capacitor C 1 is connected between the signal input terminal and the ground, and its capacity is generally about 100-500P, which is used to filter out high-frequency signals. BG 1 and BG 2 constitute a power amplifier circuit, and its output terminal is connected to a speaker. If the power amplifier circuit is made into a power amplifier circuit with a small output impedance, more than one earphone can be connected to a receiver for two or more people. Use the same set of receivers. The capacitance connected in parallel with the emission resistor is 100P.
放大电路及功率放大均为常规电路，重要参数均在图中给出。另外，可采用具有前级放大加带通放大的集成电路，也可采用前级放大加带通放大再加功放的集成电路－－即两级运放加一级功放。The amplifier circuit and power amplifier are conventional circuits, and important parameters are given in the figure. In addition, an integrated circuit with pre-amplification and band-pass amplification can be used, or an integrated circuit with pre-amplification plus band-pass amplification and power amplifier can be used-that is, two-stage operational amplifier plus one-stage power amplifier.
接收电路可以安置在小盒内，也可以与头戴式耳机一体化安置。The receiving circuit can be placed in a small box, or integrated with the headset.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91213114.4U CN2096168U (en) | 1991-01-24 | 1991-01-24 | Radio receiver for tv sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91213114.4U CN2096168U (en) | 1991-01-24 | 1991-01-24 | Radio receiver for tv sound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2096168U true CN2096168U (en) | 1992-02-12 |
Family
ID=4921530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91213114.4U Withdrawn CN2096168U (en) | 1991-01-24 | 1991-01-24 | Radio receiver for tv sound |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2096168U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188588A (en) * | 2013-03-06 | 2013-07-03 | 黄桂芳 | Mobile phone sound-amplifying player with magnetic induction way |
| CN103428592A (en) * | 2012-05-21 | 2013-12-04 | 张伟斌 | Sound amplifying device |
| WO2013185524A1 (en) * | 2012-06-15 | 2013-12-19 | 威立达数码科技(深圳)有限公司 | Magnetic induction audio equipment |
-
1991
- 1991-01-24 CN CN91213114.4U patent/CN2096168U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428592A (en) * | 2012-05-21 | 2013-12-04 | 张伟斌 | Sound amplifying device |
| WO2013185524A1 (en) * | 2012-06-15 | 2013-12-19 | 威立达数码科技(深圳)有限公司 | Magnetic induction audio equipment |
| CN103188588A (en) * | 2013-03-06 | 2013-07-03 | 黄桂芳 | Mobile phone sound-amplifying player with magnetic induction way |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |