CN2329126Y - TV/frequency-modulation receiving two purpose radio - Google Patents
TV/frequency-modulation receiving two purpose radio Download PDFInfo
- Publication number
- CN2329126Y CN2329126Y CN 97217247 CN97217247U CN2329126Y CN 2329126 Y CN2329126 Y CN 2329126Y CN 97217247 CN97217247 CN 97217247 CN 97217247 U CN97217247 U CN 97217247U CN 2329126 Y CN2329126 Y CN 2329126Y
- Authority
- CN
- China
- Prior art keywords
- oscillator
- intermediate frequency
- signal
- frequency signal
- accompanying sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Television Receiver Circuits (AREA)
Abstract
The utility model discloses a TV / FM receiving machine which belongs to the field of broadcast television. In a television composed of a tuner, a common channel and an accompanying sound channel in the prior art, an oscillator is additionally arranged between a mixing stage of the tuner and a demodulation stage of the common channel, and is provided with a switch K which is switched on at the time of receiving and is cut off at the time of watching TV. The oscillator produces a stable constant amplitude sinusoidal signal of 38MHz, the oscillation frequency of the oscillator is changed by adjusting an inductor L, and the signal is output by C5, and beats a first accompanying sound intermediate frequency signal in the demodulation stage so as to produce a second accompanying sound intermediate frequency signal. The utility model can be used for receiving the FM broadcasting station by using a television without the arrangement of a circuit of a receiving part, and has the advantages of simple line and convenient maintenance.
Description
The utility model relates to field of broadcast televisions, and is particularly relevant with television set.
In daily, people wish to have a kind of when not seeing TV, again can be with its dual-purpose machine of using as broadcast receiver.So the dual-purpose machine of a kind of TV/radio reception occurred.(the dual-purpose machine of 5 ") portable black-and-white TV AM/FM radio reception, the radio reception of this dual-purpose machine are partly independent separately with the circuit of TV part, and actual is a television set and a wireless combination as HTV-938 type 14cm.So just make circuit more complicated, maintenance difficulty increases and the cost height.
The purpose of this utility model provides compared with prior art a kind of, needn't establish the radio reception partial circuit in addition, just can receive the device of FM broadcasting with television set.
In order to achieve the above object, the dual-purpose machine of TV/FM radio of the present utility model comprises tuner, public passage and sound channel circuit.Tuner is transformed into first accompanying sound intermediate frequency signal with the high-frequency carrier signal reception of FM broadcasting.Oscillator produces a stable constant amplitude sinusoidal signal that equals visual intermediate frequency, and this oscillator signal and first accompanying sound intermediate frequency signal produce second accompanying sound intermediate frequency signal in the detector stage beat, enter sound channel again and carry out signal processing.
After adopting such structure,, needn't establish the radio reception partial circuit in addition, just can make television set increase the function that receives FM broadcasting owing to only in television set, increase an oscillator.Make that circuit is simple and reliable, easy to maintenance, cost is low, also can make the simultaneous growth of television set and wireless quantity, thereby improve the coverage rate of broadcasting effectively.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is the circuit diagram of the dual-purpose machine oscillator of the utility model TV/FM radio.
Fig. 2 is the circuit block diagram of the dual-purpose machine of the utility model TV/FM radio.
The oscillator of the dual-purpose machine of TV/FM radio shown in Figure 1 has a K switch, and during radio reception, K switch is with the power connection of oscillator, and when seeing TV, K switch disconnects.Oscillator is that common collector parallel connection type carat sprinkles oscillating circuit, and its frequency of oscillation is 38MH
z, supply voltage 12V, triode BG with 9018, resistance R
1510 Ω, R
215K Ω, R
35.1K Ω.R
41.8K Ω, capacitor C
14.7P, C
215P, C
315P, C
410P, C
52.2P, C
61500P.Adjust inductance L, can change the frequency of oscillation of oscillator, its signal is by C
5Output.
Circuit block diagram shown in Figure 2, its scheme are when FM radio, cover the high-frequency carrier signal reception of the tuner 1 of frequency modulation frequency range with FM broadcasting, change 31.5MH after the mixing into
zFirst accompanying sound intermediate frequency signal, at the A point of mixing output, add a stable constant amplitude sinusoidal signal that produces by oscillator 4, its frequency is 38MH
zTwo signals carry out beat in the detector stage of public passage 2, produce 6.5MH
zSecond accompanying sound intermediate frequency signal, FM broadcasting just can be carried out signal processing at sound channel 3 as television audio signals like this.
Certainly, be not limited to above-mentioned a kind of oscillator, also available other can produce the oscillator of stabilized frequency, as crystal oscillator.And the generation of second accompanying sound intermediate frequency signal also can be like this, and oscillator produces 31.5MH
zConstant amplitude sinusoidal signal and the 38MH that sends here of tuner
zThe first accompanying sound intermediate frequency signal beat and getting.
Claims (4)
1, the dual-purpose machine of a kind of TV/FM radio, it comprises tuner, public passage and sound channel, tuner (1) receives TV carrier signal, be transformed into the image medium-frequency signal and first accompanying sound intermediate frequency signal after the mixing, and go out second accompanying sound intermediate frequency signal in the detector stage beat of public passage (2), enter sound channel (3) then, it is characterized in that: between the detector stage of the mixer stage of tuner (1) and public passage (2), added an oscillator (4).
2, the dual-purpose machine of TV/FM radio according to claim 1 is characterized in that, the frequency of oscillation that this oscillator (4) produces equals visual intermediate frequency.
3, the dual-purpose machine of TV/FM radio according to claim 1 is characterized in that, the frequency of oscillation that this oscillator (4) produces equals first sound intermediate frequency.
According to claim 1 or the dual-purpose machine of 2 or 3 described TV/FM radios, it is characterized in that 4, intermediate-freuqncy signal and the accompanying sound intermediate frequency signal after the mixing that this oscillator (4) produces go out second accompanying sound intermediate frequency signal in the detector stage beat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97217247 CN2329126Y (en) | 1996-05-11 | 1997-05-07 | TV/frequency-modulation receiving two purpose radio |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN962111392 | 1996-05-11 | ||
| CN 97217247 CN2329126Y (en) | 1996-05-11 | 1997-05-07 | TV/frequency-modulation receiving two purpose radio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2329126Y true CN2329126Y (en) | 1999-07-14 |
Family
ID=33933882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97217247 Expired - Fee Related CN2329126Y (en) | 1996-05-11 | 1997-05-07 | TV/frequency-modulation receiving two purpose radio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2329126Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100525407C (en) * | 2005-05-26 | 2009-08-05 | 海尔集团公司 | TV set with FM receiver function |
-
1997
- 1997-05-07 CN CN 97217247 patent/CN2329126Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100525407C (en) * | 2005-05-26 | 2009-08-05 | 海尔集团公司 | TV set with FM receiver function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |