CN2595120Y - Automatic remote frequency variable radio FM earphone - Google Patents
Automatic remote frequency variable radio FM earphone Download PDFInfo
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- CN2595120Y CN2595120Y CN 03202010 CN03202010U CN2595120Y CN 2595120 Y CN2595120 Y CN 2595120Y CN 03202010 CN03202010 CN 03202010 CN 03202010 U CN03202010 U CN 03202010U CN 2595120 Y CN2595120 Y CN 2595120Y
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Abstract
The utility model relates to a fully automatic wireless FM earphone, which can control in a remote control mode and can automatically switch sound frequency channels. The fully automatic wired FM earphone can be used on televisions, VCDs, DVDs and various sound devices to listen in a wireless mode. The fully automatic wired FM earphone is composed of two large parts: a transmitter and a receiver, wherein, the transmitter mainly comprises parts of an MCU microprocessor, an infrared remote control receiving circuit, a display circuit, a PLL phase locking control circuit and an FM modulator and an RF amplifier; the receiver mainly comprises an MCU microprocessor, keys, an infrared remote control transmitting circuit, a PLL phase locking control circuit, an FM demodulator and an audio amplifier. The transmission of the transmitting part of the utility model and frequency selection are all controlled by the earphone part; the operation is convenient; the utility model realizes real wireless significance. Simultaneously, because the phase locking technique is used, the utility model not only can accurately stabilize frequency but also can switch frequency and prevent interference appearing when different users use; consequently, the fully automatic wireless FM earphone can realize large-area generalization and use. The wireless FM earphone can be used as an external accessory of televisions, VCDs, DVDs and various sound devices. The audio input of the transmitter is only required to be connected with audio output signals of a sound device; the interface is very simple; the operation is convenient. The receiver part only requires 3V voltage to supply power, and is capable of using dry batteries. The utility model has the characteristics of electricity saving, convenient carrying, etc.
Description
Affiliated technical field
The utility model relates to a kind of earphone that can wirelessly listen to.
Background technology
Traditional earphone requires to link to each other with earphone by tone frequency channel wire, cumbersome in the process of using like this, when particularly the equipment of sounding is big, give to listen to and bring a lot of inconvenience, remote control frequency conversion wireless headset can make listens to that music and various program bring easily and convenient, and need not copy electric equipment mechanically, also need not listen to program by long tone frequency channel wire.
Summary of the invention
The utility model is a kind of wireless headset with remote control switch, frequency conversion function.Can be used on television set, VCD, DVD and the various stereo set and carry out wireless listening to.
Occurred various wireless headsets in the market, Infrared wireless earphone and Audio frequency radio earphone have wherein been arranged.Infrared wireless earphone is walked about in the listener front as the people, or can not receive when having other article to stop; Audio frequency radio earphone then sound effect is bad.The frequency modulation wireless headset has solved above two problems, and not being afraid of has article to stop, sound effect is fine simultaneously, and can also make stereo by corresponding circuit; But present existing radio FM earphone is to decide frequency entirely, and circuit is simpler, and phenomenon can appear frequently floating in the frequency instability after use a period of time, and simultaneously owing to fixed-frequency, contiguous user's use can interfere with each other, and is not suitable for practical large-scale and promotes the use of.
The utility model adopts the PLL Phase Lock Technique, and switching frequency as required simultaneously can stabilized frequency, has solved above problem.For switch and the operational convenience of switching frequency, the utility model has also added a function of infrared remote control simultaneously.When receiver is just started shooting, can search for all channels automatically,, this channel information be issued reflector by infrared ray up to confirming that certain channel does not have other signal, and reflector is adjusted tranmitting frequency again according to this signal, and the user just can listen on a channel that does not have fully to disturb like this.If in listening to process, want not listened, can close reflector by the switch key on the receiver, can avoid other people is caused interference, also can power saving.And if in listening to process, the sound of hearing has when interference to find another clear channel by the platform key of moving certainly on the receiver, and this signal is issued reflector by infrared transmitting tube, and reflector is adjusted tranmitting frequency again, continues to listen to.If all channels all have interference, the then available platform key that manually changes oneself looks for one to disturb a little bit smaller platform to listen to relatively, certain this situation seldom, less transmitting power makes you very little to longer-distance others' interference, simultaneously also make others very little to your interference, select suitable parameters that actual usable frequency width is reached about 20MHz, have enough spaces to allow the user use freely fully.
For present TV signal is monaural, and concerning VCD, DVD, stereo set etc., and monophony is to satisfy user's requirement.At this moment the modulating part in the reflector and the demodulation part in the receiver all can be changed into stereosonicly, just can allow the user enjoy dulect music by this wireless headset.
The utility model is made up of reflector and receiver.
Reflector is made up of MCU microprocessor, preemphasis circuit, attenuator circuit, PLL control circuit of phase locking, FM modulation circuit, radio frequency amplifying circuit, demonstration (comprising with various display devices such as charactron, liquid crystal), infrared remote control receiving circuit and power supply.Its circuit block diagram is seen figure (1).
Receiver is made up of MCU microprocessor, FM demodulation, PLL control circuit of phase locking, audio amplifier circuit, button, Infrared Remote-Control Sending circuit and power supply.Its circuit block diagram is seen figure (2).
Figure (3) is a specific embodiment of reflector in the utility model.
U1 is the display part, and 3 pin connect power supply.
U4 is that remote control receives a circuit, 1 pin ground connection, and 2 pin connect power supply.
U2 is the MCU microprocessor, and 14 pin connect power supply, 5 pin ground connection; 16 pin constitute oscillating circuit for the vibration input pin by R2, C2; 4 pin are resetting pin, constitute reset circuit by R1, C1; 2 pin link to each other with 3 pin of U4 as the remote signal input pin, receive infrared signal; 1,18,17 pin link to each other with 5,4,3 pin of U3 respectively by R23, R24, R25 and carry out communication; 6 pin are controlled the power supply of other circuit by R23 and Q5; 7,8,9,10,11,12,13 pin link to each other with 7,6,4,2,1,9,10 of U1 respectively by R16, R17, R18, R19, R20, R21, R22, the demonstration of control U1.
U3 is the PLL phase-locked loop circuit, and 12 pin connect power supply, 15 pin ground connection; 1,2 pin are vibration input and output pin, connect the reference frequency of X1, C3, C4 formation PLL phase lock circuitry; 3,4,5 pin and MCU carry out communication usefulness; High-frequency signal after radio frequency amplifies is coupled into 14 pin by C19, the phase signal that draws of comparing with the frequency that MCU is provided with is exported from 19 pin, the integrating circuit that constitutes via R3, R4, C6, C5, R7, Q1, Q2 forms the frequency that VT controls the electric capacity of variable capacitance diode D1 and then adjusts oscillating circuit again, form a loop, thereby can pin a stable frequency of oscillation, promptly final tranmitting frequency.
Audio signal is introduced by socket J1, and by preemphasis and the attenuator circuit of being made up of R8, R9, R10, C8, the VT addition that forms with top U3 through the C9 coupling is controlled the capacitance variations of D1 and audio signal is modulated on the oscillating circuit again.Oscillating circuit is made up of D1, L1, C10, C11, C12, C13, C14, R11, R12, R13, Q3.R6 and C7 mainly are that the high-frequency signal to oscillating part carries out filtering, prevent to disturb the low-frequency channel of front.L3 is the high frequency choke coil.The high-frequency signal of modulating is delivered to radio frequency amplifying circuit and is amplified after the C15 coupling, launched by antenna after the C17 coupling then.Radio frequency amplifying circuit is made up of R14, R15, C16, C18, Q4, L2.
Power unit is supplied with by the power supply that MCU controls the rear end, and C20, C21, C22, C23 are power filtering capacitor.
Figure (4) is a specific embodiment of receiver in the utility model.
U1 is the FM receiving demodulation circuit, and 3 pin connect power supply, 18 pin ground connection, and C19 and C10 are filter capacitor; FM signal is input to 19 pin through L2, C13; 1 pin and L1, C1, C2, D1 form local oscillation circuit; 13 pin are the MUTE pin, output high level during no signal, and when receive signal output low level, behind R8, Q4, R4 as the SD signal feedback to 10 pin of U2; 14 pin are the audio frequency output pin, enter audio frequency and import 12 pin behind C15, VR1 (adjustment volume), C16, amplify after the output of 11 pin is received the audio frequency amplifier section through R5, R6, C20.
U2 is the MCU microprocessor, and 14 pin connect power supply, 5 pin ground connection; 16 pin constitute oscillating circuit for the vibration input pin by R13, C27; 4 pin are resetting pin, constitute reset circuit by R12, C26; 2 pin are launched by infrared transmitting tube LED1 after amplifying through R23, R24, Q8 as the remote signal output pin again; 1,17,18 pin link to each other with 11,12,13 pin of U3 respectively and carry out communication; 6,7,8 pin connect button respectively as the ON/OFF key, certainly move the platform key, manually change the platform key; 10 pin connect the SD signal; 11 pin are received audio frequency input pin 12 pin of U1 as the BEEP output pin by R7, C18; 12 pin are controlled the power supply of other parts circuit by R21, Q3; 13 pin are by R10, Q5, the C22 quiet control as entire headset.
U3 is the PLL phase-locked loop circuit, and 3 pin connect power supply, 6 pin ground connection, and 8 pin are I0 mouth power supply, by the R22 step-down, by connecing power supply after the C23 filtering; 1,2 pin are vibration input and output pin, with the reference frequency of X1, C28, C29 formation PLL phase lock circuitry; 11,12,13 pin and MCU carry out communication usefulness; The local oscillation signal that amplified through C30, R14, R15, Q1, C31, R16, R17, Q2, C32 is input to 7 pin, the frequency that is provided with MCU compares the phase signal that draws and is exported by 5 pin, the integrating circuit of forming through R18, R19, R20, C24 forms electric capacity and then the adjustment local frequency formation loop that VT controls variable capacitance diode D1 again, thereby can pin receive frequency.
Audio amplifier circuit is made up of Q6, Q7, C21, R9, R11, R25, L3, L4.
Power unit is supplied with by the power supply that MCU controls the rear end, and C33, C34, C35, C36 are power filtering capacitor.
Claims (8)
1. remote control frequency conversion full-automatic wireless frequency modulation earphone that is made of wireless launcher, receiver, it is characterized in that: reflector is made up of MCU microprocessor, preemphasis circuit, attenuator circuit, PLL control circuit of phase locking, FM modulation circuit, radio frequency amplifying circuit, demonstration (comprising with various display devices such as charactron, liquid crystal), infrared remote control receiving circuit and power supply.
2. remote control frequency conversion full-automatic wireless frequency modulation earphone according to claim 1 is characterized in that: an infrared remote control receiving circuit is arranged in the reflector, can receive the control signal that receiver is partly sent.
3. remote control frequency conversion full-automatic wireless frequency modulation earphone according to claim 1 is characterized in that: the oscillating circuit in the reflector is by the phase-locked control of PLL, thereby both can select the frequency of a free time on demand, again can stabilized frequency, prevent from frequently to float.
4. remote control frequency conversion full-automatic wireless frequency modulation earphone according to claim 1, it is characterized in that: a MCU microprocessor is arranged in the reflector, using its decoding infrared remote control signals, be tranmitting frequency thereby control frequency of oscillation by the PLL phase lock circuitry, and whether the may command reflector is launched.
5. remote control frequency conversion full-automatic wireless frequency modulation earphone that is made of wireless launcher, receiver, it is characterized in that: receiver is made up of MCU microprocessor, FM demodulation, PLL control circuit of phase locking, audio amplifier circuit, button, Infrared Remote-Control Sending circuit and power supply.
6. remote control frequency conversion full-automatic wireless frequency modulation earphone according to claim 5 is characterized in that: an Infrared Remote-Control Sending circuit is arranged in the receiver, user's control signal can be transmitted to reflector by infrared mode.
7. remote control frequency conversion full-automatic wireless frequency modulation earphone according to claim 5, it is characterized in that: the local oscillation circuit in the receiver is listened to frequency by the phase-locked control of PLL thereby can lock.
8. remote control frequency conversion full-automatic wireless frequency modulation earphone according to claim 5, it is characterized in that: a MCU microprocessor is arranged in the receiver, receive user's control signal by button with it, frequency by PLL phase lock circuitry control reception, and whether the may command receiver work, and simultaneously this signal encoding is transmitted to reflector by infrared tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03202010 CN2595120Y (en) | 2003-01-09 | 2003-01-09 | Automatic remote frequency variable radio FM earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03202010 CN2595120Y (en) | 2003-01-09 | 2003-01-09 | Automatic remote frequency variable radio FM earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2595120Y true CN2595120Y (en) | 2003-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03202010 Expired - Lifetime CN2595120Y (en) | 2003-01-09 | 2003-01-09 | Automatic remote frequency variable radio FM earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2595120Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087485B (en) * | 2007-07-11 | 2010-05-19 | 华南理工大学 | A transmission control method of multi-sound source remote distance wireless sound box and its device |
| CN101111997B (en) * | 2004-11-29 | 2012-09-05 | 新加坡国立大学 | Device and method for decoding audio frequency data representing audio editing |
-
2003
- 2003-01-09 CN CN 03202010 patent/CN2595120Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101111997B (en) * | 2004-11-29 | 2012-09-05 | 新加坡国立大学 | Device and method for decoding audio frequency data representing audio editing |
| CN101087485B (en) * | 2007-07-11 | 2010-05-19 | 华南理工大学 | A transmission control method of multi-sound source remote distance wireless sound box and its device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130109 Granted publication date: 20031224 |