CN216531296U - Radio signal selection control circuit and vehicle-mounted radio system - Google Patents
Radio signal selection control circuit and vehicle-mounted radio system Download PDFInfo
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- CN216531296U CN216531296U CN202122634832.7U CN202122634832U CN216531296U CN 216531296 U CN216531296 U CN 216531296U CN 202122634832 U CN202122634832 U CN 202122634832U CN 216531296 U CN216531296 U CN 216531296U
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Abstract
The application provides a radio signal selection control circuit and a vehicle-mounted radio system. The radio signal selection control circuit comprises a vehicle-mounted radio, a frequency modulation signal circuit and an amplitude modulation signal circuit; the frequency modulation signal circuit comprises a frequency modulation capacitor, a first electronic switching tube and a first resistor, wherein the second end of the frequency modulation capacitor is connected with the control end of the first electronic switching tube, and the first end of the first electronic switching tube is connected with the frequency modulation receiving end of the vehicle-mounted radio; the amplitude modulation signal circuit comprises an amplitude modulation inductor, a second electronic switching tube and a second resistor, wherein the second end of the amplitude modulation inductor is connected with the control end of the second electronic switching tube, and the first end of the second electronic switching tube is connected with the amplitude modulation receiving end of the vehicle-mounted radio. By means of the high-frequency characteristic, the frequency modulation signal is connected to the first electronic switch tube through the frequency modulation capacitor, so that the first electronic switch tube is in an amplification state, the potential of the frequency modulation receiving end of the vehicle-mounted radio is increased, and the vehicle-mounted radio is convenient to control the output of the frequency modulation signal.
Description
Technical Field
The utility model relates to the technical field of radio signal processing, in particular to a radio signal selection control circuit and a vehicle-mounted radio system.
Background
With the development of radio technology, consumer electronics products receiving broadcast channels in AM (520-. Such products are typically provided with separate external AM and FM circuit boards to reduce noise interference from internal electronic system components.
However, after the vehicle passes through a certain specific area, for example, a junction between an urban area and a mountain area, the conventional car radio needs to manually adjust the radio reception mode, that is, manually adjust the AM and FM modes, which results in that a driver needs to be distracted to manually adjust the AM and FM modes, which is very easy to cause an accident, and cannot automatically switch the radio reception mode.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a radio signal selection control circuit and a radio device which are convenient for automatically switching radio modes.
The purpose of the utility model is realized by the following technical scheme:
a radio signal selection circuit, comprising: the vehicle-mounted radio comprises a vehicle-mounted radio, a frequency modulation signal circuit and an amplitude modulation signal circuit; the frequency modulation signal circuit comprises a frequency modulation capacitor, a first electronic switch tube and a first resistor, wherein a first end of the frequency modulation capacitor is used for being connected with a radio signal receiving end, a second end of the frequency modulation capacitor is connected with a control end of the first electronic switch tube, a second end of the frequency modulation capacitor is also connected with a first end of the first electronic switch tube through the first resistor, a first end of the first electronic switch tube is connected with a frequency modulation receiving end of the vehicle-mounted radio, a first end of the first electronic switch tube is also used for being connected with a reference power supply, and a second end of the first electronic switch tube is grounded; the amplitude modulation signal circuit comprises an amplitude modulation inductor, a second electronic switching tube and a second resistor, wherein a first end of the amplitude modulation inductor is connected with a radio signal receiving end, a second end of the amplitude modulation inductor is connected with a control end of the second electronic switching tube, a second end of the amplitude modulation inductor is further connected with a first end of the second electronic switching tube through the second resistor, a first end of the second electronic switching tube is connected with an amplitude modulation receiving end of the vehicle-mounted radio, a first end of the second electronic switching tube is further used for being connected with a reference power supply, and a second end of the second electronic switching tube is grounded.
In one embodiment, the frequency-modulated signal circuit further includes a third resistor, a first end of the third resistor is connected to the reference power supply, and a second end of the third resistor is connected to the first end of the first electronic switch tube.
In one embodiment, the frequency modulation signal circuit further includes a fourth resistor, the second terminal of the first electronic switch tube is connected to the first terminal of the fourth resistor, and the second terminal of the fourth resistor is grounded.
In one embodiment, the frequency modulation signal circuit further includes a first capacitor, a first end of the first capacitor is connected to the reference power supply, a second end of the first capacitor is used for grounding, and the first capacitor is used for filtering out a first radio frequency interference signal.
In one embodiment, the fm signal circuit further includes a first inductor and a second capacitor, a first end of the first electronic switching tube is connected to a first end of the second capacitor, a second end of the second capacitor is connected to a first end of the first inductor, and a second end of the first inductor is connected to a fm receiving end of the car radio.
In one embodiment, the frequency modulation signal circuit further includes a second inductor, a second terminal of the second capacitor is connected to a first terminal of the second inductor, and a second terminal of the second inductor is grounded.
In one embodiment, the amplitude modulation signal circuit further includes a third capacitor, the second terminal of the amplitude modulation inductor is connected to the first terminal of the third capacitor, and the second terminal of the third capacitor is connected to the control terminal of the second electronic switching tube.
In one embodiment, the amplitude modulation signal circuit further comprises a fourth capacitor, the second terminal of the amplitude modulation inductor is connected with the first terminal of the fourth capacitor, and the second terminal of the fourth capacitor is grounded.
In one embodiment, the amplitude modulation signal circuit further includes a fifth capacitor, the first end of the second electronic switch tube is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is connected to the amplitude modulation receiving end of the car radio.
A vehicle-mounted radio system comprises the radio signal selection control circuit in any embodiment.
Compared with the prior art, the utility model has at least the following advantages:
when the signal received by the radio signal receiving end is converted, if the signal is a frequency modulation signal, the frequency modulation signal is connected to the first electronic switch tube through the frequency modulation capacitor by virtue of the high-frequency characteristic of the frequency modulation signal, so that the first electronic switch tube is in an amplification state, the potential of the frequency modulation receiving end of the vehicle-mounted radio is increased, and the vehicle-mounted radio is convenient to control the output of the frequency modulation signal; if the radio signal is an amplitude modulation signal, the amplitude modulation signal is connected to the second electronic switching tube through the frequency modulation inductor by virtue of the low-frequency characteristic of the amplitude modulation signal relative to the frequency modulation signal, so that the second electronic switching tube is in an amplification state, the potential of a tuning-two receiving end of the vehicle-mounted radio is increased, the vehicle-mounted radio is convenient to control the output of the tuning-two signal, and the automatic switching of the radio mode after the radio signal is converted is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a circuit diagram of a radio signal selection circuit according to an embodiment.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model relates to a radio signal selection control circuit. In one embodiment, the radio signal selection circuit comprises a car radio, a frequency modulation signal circuit and an amplitude modulation signal circuit. The frequency modulation signal circuit comprises a frequency modulation capacitor, a first electronic switching tube and a first resistor. The first end of the frequency modulation capacitor is used for being connected with a radio signal receiving end, the second end of the frequency modulation capacitor is connected with the control end of the first electronic switch tube, and the second end of the frequency modulation capacitor is connected with the first end of the first electronic switch tube through the first resistor. The first end of the first electronic switch tube is connected with a frequency modulation receiving end of the vehicle-mounted radio, the first end of the first electronic switch tube is also used for being connected with a reference power supply, and the second end of the first electronic switch tube is grounded. The amplitude modulation signal circuit comprises an amplitude modulation inductor, a second electronic switching tube and a second resistor. The first end of the amplitude modulation inductor is connected with a radio signal receiving end, the second end of the amplitude modulation inductor is connected with the control end of the second electronic switching tube, and the second end of the amplitude modulation inductor is also connected with the first end of the second electronic switching tube through the second resistor. The first end of the second electronic switching tube is connected with an amplitude modulation receiving end of the vehicle-mounted radio, the first end of the second electronic switching tube is also used for being connected with a reference power supply, and the second end of the second electronic switching tube is grounded. When the signal received by the radio signal receiving end is converted, if the signal is a frequency modulation signal, the frequency modulation signal is connected to the first electronic switch tube through the frequency modulation capacitor by virtue of the high-frequency characteristic of the frequency modulation signal, so that the first electronic switch tube is in an amplification state, the potential of the frequency modulation receiving end of the vehicle-mounted radio is increased, and the vehicle-mounted radio is convenient to control the output of the frequency modulation signal; if the radio signal is an amplitude modulation signal, the amplitude modulation signal is connected to the second electronic switching tube through the frequency modulation inductor by virtue of the low-frequency characteristic of the amplitude modulation signal relative to the frequency modulation signal, so that the second electronic switching tube is in an amplification state, the potential of a tuning-two receiving end of the vehicle-mounted radio is increased, the vehicle-mounted radio is convenient to control the output of the tuning-two signal, and the automatic switching of the radio mode after the radio signal is converted is realized.
Please refer to fig. 1, which is a circuit diagram of a radio signal selection circuit according to an embodiment of the present invention.
The radio signal selection circuit 10 of one embodiment includes a car radio U1, a FM signal circuit 100, and an AM signal circuit 200. The frequency modulation signal circuit 100 comprises a frequency modulation capacitor CF1, a first electronic switch tube Q1 and a first resistor R1. The first end of the frequency modulation capacitor CF1 is used for being connected with a radio signal receiving end, the second end of the frequency modulation capacitor CF1 is connected with the control end of the first electronic switch tube Q1, and the second end of the frequency modulation capacitor CF1 is also connected with the first end of the first electronic switch tube Q1 through the first resistor R1. The first end of the first electronic switch tube Q1 is connected with the FM receiving end of the vehicle radio U1, the first end of the first electronic switch tube Q1 is also used for being connected with a reference power supply, and the second end of the first electronic switch tube Q1 is grounded. The amplitude modulation signal circuit 200 comprises an amplitude modulation inductor LA1, a second electronic switch tube Q2 and a second resistor R2. The first end of the amplitude-modulated inductor LA1 is connected to a radio signal receiving end, the second end of the amplitude-modulated inductor LA1 is connected to the control end of the second electronic switching tube Q2, and the second end of the amplitude-modulated inductor LA1 is further connected to the first end of the second electronic switching tube Q2 through the second resistor R2. The first end of the second electronic switching tube Q2 is connected with an amplitude modulation receiving end of the vehicle radio U1, the first end of the second electronic switching tube Q2 is further used for being connected with a reference power supply, and the second end of the second electronic switching tube Q2 is grounded.
In the embodiment, when the signal received by the radio signal receiving end is converted, if the signal is a frequency modulation signal, by virtue of the high-frequency characteristic of the frequency modulation signal, the frequency modulation signal is connected to the first electronic switch tube Q1 through the frequency modulation capacitor CF1, so that the first electronic switch tube Q1 is in an amplification state, the potential of the frequency modulation receiving end of the car radio U1 is increased, and the car radio U1 can control the output of the frequency modulation signal; if the radio signal is an amplitude modulation signal, the amplitude modulation signal is connected to the second electronic switch tube Q2 through the frequency modulation inductor by virtue of the low-frequency characteristic of the amplitude modulation signal relative to the frequency modulation signal, so that the second electronic switch tube Q2 is in an amplification state, the potential of the secondary modulation receiving end of the vehicle-mounted radio U1 is increased, the vehicle-mounted radio U1 can control the output of the secondary modulation signal conveniently, and the automatic switching of the radio mode after the radio signal is converted is realized. The frequency modulation signal is an FM signal, the amplitude modulation signal is an AM signal, the first electronic switching tube and the second electronic switching tube are both NPN type triodes, the first end of the first electronic switching tube is a collector electrode of the NPN type triode, the second end of the first electronic switching tube is an emitter electrode of the NPN type triode, the control end of the first electronic switching tube is a base electrode of the NPN type triode, and the vehicle-mounted radio is an SI4745 vehicle-mounted radio chip.
In one embodiment, referring to fig. 1, the frequency modulation signal circuit 100 further includes a third resistor R3, a first end of the third resistor R3 is connected to the reference power source, and a second end of the third resistor R3 is connected to the first end of the first electronic switch Q1. In this embodiment, the third resistor R3 is located between the reference power source and the first electronic switch Q1, that is, the third resistor R3 is connected in series between the reference power source and the first end of the first electronic switch Q1, the third resistor R3 limits the output current of the reference power source, and the third resistor R3 drops the voltage output by the reference power source, so as to adjust the voltage at the first end of the first electronic switch Q1, so that the voltage at the first end of the first electronic switch Q1 changes. Thus, when a frequency modulation signal is input, the current at the first end of the first electronic switching tube Q1 is increased, so that the voltage at the first end of the first electronic switching tube Q1 is greatly changed, and the voltage change amplitude at the first end of the first electronic switching tube Q1 is increased, so that the frequency modulation receiving end of the car radio U1 detects the change of the voltage, that is, the frequency modulation receiving end of the car radio U1 detects that the voltage is changed from a low level to a high level, and further, the output of the frequency modulation signal by the car radio U1 is triggered.
In one embodiment, referring to fig. 1, the frequency modulation signal circuit 100 further includes a fourth resistor R4, a second terminal of the first electronic switch Q1 is connected to a first terminal of the fourth resistor R4, and a second terminal of the fourth resistor R4 is grounded. In this embodiment, the fourth resistor R4 is located at the second end of the first electronic switch Q1, that is, the fourth resistor R4 is connected in series to the second end of the first electronic switch Q1, so that the fourth resistor R4 pulls up the voltage at the second end of the first electronic switch Q1, thereby stabilizing the static operating point of the first electronic switch Q1.
In one embodiment, referring to fig. 1, the frequency modulation signal circuit 100 further includes a first capacitor C1, a first end of the first capacitor C1 is connected to the reference power source, a second end of the first capacitor C1 is connected to ground, and the first capacitor C1 is configured to filter out a first radio frequency interference signal. In this embodiment, the first capacitor C1 is connected to the reference power supply, the reference power supply provides a voltage signal to the first terminal of the first electronic switch Q1, and the first capacitor C1 filters the voltage input to the first terminal of the first electronic switch Q1, so as to filter the interference signal at the first terminal of the first electronic switch Q1, thereby ensuring that the first terminal of the first electronic switch Q1 inputs an accurate reference voltage signal, and ensuring that the operating state of the first electronic switch Q1 is stable.
In one embodiment, referring to fig. 1, the fm signal circuit 100 further includes a first inductor L1 and a second capacitor C2, a first end of the first electronic switch Q1 is connected to a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to a first end of the first inductor L1, and a second end of the first inductor L1 is connected to a fm receiving end of the car radio U1. In this embodiment, the first inductor L1 and the second capacitor C2 are located between the first end of the first electronic switch tube Q1 and the fm receiving end of the car radio U1, the first inductor L1 is connected in series with the second capacitor C2, the first inductor L1 and the second capacitor C2 form a resonant circuit, so as to perform filtering processing of a specified frequency on the voltage signal at the first end of the first electronic switch tube Q1, so as to provide a stable and accurate control signal for triggering the fm receiving end of the car radio U1, and effectively reduce interference of external noise signals.
Further, the frequency modulation signal circuit 100 further includes a second inductor L2, a second terminal of the second capacitor C2 is connected to the first terminal of the second inductor L2, and a second terminal of the second inductor L2 is grounded. In this embodiment, the second inductor L2 is connected in parallel to the second end of the second capacitor C2, and since the first inductor L1 and the second capacitor C2 form a series resonant circuit, the frequency of the voltage signal input to the fm receiving end of the car radio U1 is selected, that is, the interfering radio frequency signal is filtered, and the second inductor L2 further filters the low-frequency signal in the interfering radio frequency signal, so that the stability of the voltage signal input to the fm receiving end of the car radio U1 is further improved, and the interference of the external radio frequency signal is further reduced.
In one embodiment, referring to fig. 1, the amplitude modulation signal circuit 200 further includes a third capacitor C3, a second terminal of the amplitude modulation inductor LA1 is connected to the first terminal of the third capacitor C3, and a second terminal of the third capacitor C3 is connected to the control terminal of the second electronic switch Q2. In this embodiment, the third capacitor C3 is located between the amplitude modulation inductor LA1 and the control terminal of the second electronic switch Q2, that is, the third capacitor C3 is connected in series to the amplitude modulation inductor LA1 and the control terminal of the second electronic switch Q2, that is, the third capacitor C3 connects the amplitude modulation inductor LA1 and the control terminal of the second electronic switch Q2, so that the third capacitor C3 and the amplitude modulation inductor LA1 form a series resonant circuit, and according to the sizes of the third capacitor C3 and the amplitude modulation inductor LA1, the frequency selection of the specified frequency is facilitated, so as to filter the interference signal in the amplitude modulation signal, so as to facilitate selecting the amplitude modulation signal of the specified frequency, and improve the interference resistance of the amplitude modulation signal.
In one embodiment, referring to fig. 1, the amplitude modulation signal circuit 200 further includes a fourth capacitor C4, the second terminal of the amplitude modulation inductor LA1 is connected to the first terminal of the fourth capacitor C4, and the second terminal of the fourth capacitor C4 is connected to ground. In this embodiment, the capacitance value of the fourth capacitor C4 is different from the capacitance value of the third capacitor C3, the third capacitor C3 filters the amplitude modulation signal after forming a resonant circuit with the amplitude modulation inductor LA1, and the fourth capacitor C4 performs multi-stage filtering on the amplitude modulation signal, so that other interference signals in the amplitude modulation signal are filtered out, and the interference immunity of the amplitude modulation signal is further improved.
In one embodiment, referring to fig. 1, the amplitude modulation signal circuit 200 further includes a fifth capacitor C5, the first terminal of the second electronic switch Q2 is connected to the first terminal of the fifth capacitor C5, and the second terminal of the fifth capacitor C5 is connected to the amplitude modulation receiving terminal of the car radio U1. In this embodiment, the voltage at the first end of the second electronic switch Q2 is used as the trigger voltage of the am receiving end of the car radio U1, the electrical signal at the first end of the second electronic switch Q2 is based on the electrical signal at the control end of the second electronic switch Q2, and the fifth capacitor C5 filters the signal input to the am receiving end of the car radio U1 to filter out the specified interference signal therein, so as to improve the stability of the control signal input to the am receiving end.
In one embodiment, the present application further provides a car radio system, including the radio signal selection control circuit described in any of the above embodiments. In this embodiment, the radio signal selection control circuit includes a car radio, a frequency modulation signal circuit, and an amplitude modulation signal circuit. The frequency modulation signal circuit comprises a frequency modulation capacitor, a first electronic switching tube and a first resistor. The first end of the frequency modulation capacitor is used for being connected with a radio signal receiving end, the second end of the frequency modulation capacitor is connected with the control end of the first electronic switch tube, and the second end of the frequency modulation capacitor is connected with the first end of the first electronic switch tube through the first resistor. The first end of the first electronic switch tube is connected with a frequency modulation receiving end of the vehicle-mounted radio, the first end of the first electronic switch tube is also used for being connected with a reference power supply, and the second end of the first electronic switch tube is grounded. The amplitude modulation signal circuit comprises an amplitude modulation inductor, a second electronic switching tube and a second resistor. The first end of the amplitude modulation inductor is connected with a radio signal receiving end, the second end of the amplitude modulation inductor is connected with the control end of the second electronic switching tube, and the second end of the amplitude modulation inductor is also connected with the first end of the second electronic switching tube through the second resistor. The first end of the second electronic switching tube is connected with an amplitude modulation receiving end of the vehicle-mounted radio, the first end of the second electronic switching tube is further used for being connected with a reference power supply, and the second end of the second electronic switching tube is grounded. When the signal received by the radio signal receiving end is converted, if the signal is a frequency modulation signal, the frequency modulation signal is connected to the first electronic switch tube through the frequency modulation capacitor by virtue of the high-frequency characteristic of the frequency modulation signal, so that the first electronic switch tube is in an amplification state, the potential of the frequency modulation receiving end of the vehicle-mounted radio is increased, and the vehicle-mounted radio is convenient to control the output of the frequency modulation signal; if the radio signal is an amplitude modulation signal, the amplitude modulation signal is connected to the second electronic switching tube through the frequency modulation inductor by virtue of the low-frequency characteristic of the amplitude modulation signal relative to the frequency modulation signal, so that the second electronic switching tube is in an amplification state, the potential of a tuning-two receiving end of the vehicle-mounted radio is increased, the vehicle-mounted radio is convenient to control the output of the tuning-two signal, and the automatic switching of the radio mode after the radio signal is converted is realized. The frequency modulation signal is an FM signal, the amplitude modulation signal is an AM signal, the first electronic switching tube and the second electronic switching tube are both NPN type triodes, the first end of the first electronic switching tube is a collector electrode of the NPN type triode, the second end of the first electronic switching tube is an emitter electrode of the NPN type triode, the control end of the first electronic switching tube is a base electrode of the NPN type triode, and the vehicle-mounted radio is an SI4745 vehicle-mounted radio chip.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A radio signal selection circuit, comprising:
a vehicle-mounted radio receiver is arranged on the vehicle,
the frequency modulation signal circuit comprises a frequency modulation capacitor, a first electronic switching tube and a first resistor, wherein a first end of the frequency modulation capacitor is used for being connected with a radio signal receiving end, a second end of the frequency modulation capacitor is connected with a control end of the first electronic switching tube, a second end of the frequency modulation capacitor is further connected with a first end of the first electronic switching tube through the first resistor, a first end of the first electronic switching tube is connected with a frequency modulation receiving end of the vehicle-mounted radio, a first end of the first electronic switching tube is further used for being connected with a reference power supply, and a second end of the first electronic switching tube is grounded;
the amplitude modulation circuit comprises an amplitude modulation inductor, a second electronic switching tube and a second resistor, wherein a first end of the amplitude modulation inductor is connected with a radio signal receiving end, a second end of the amplitude modulation inductor is connected with a control end of the second electronic switching tube, a second end of the amplitude modulation inductor is further connected with a first end of the second electronic switching tube through the second resistor, a first end of the second electronic switching tube is connected with an amplitude modulation receiving end of the vehicle-mounted radio, a first end of the second electronic switching tube is further used for being connected with a reference power supply, and a second end of the second electronic switching tube is grounded.
2. The radio signal selection control circuit according to claim 1, wherein the frequency modulation signal circuit further comprises a third resistor, a first end of the third resistor is connected to the reference power supply, and a second end of the third resistor is connected to the first end of the first electronic switch tube.
3. The radio signal selection control circuit according to claim 1, wherein the frequency modulation signal circuit further comprises a fourth resistor, a second terminal of the first electronic switch tube is connected to a first terminal of the fourth resistor, and a second terminal of the fourth resistor is grounded.
4. The radio signal selection control circuit according to claim 1, wherein the frequency modulation signal circuit further comprises a first capacitor, a first end of the first capacitor is connected to the reference power supply, a second end of the first capacitor is connected to ground, and the first capacitor is configured to filter out a first radio frequency interference signal.
5. The radio signal selection control circuit according to claim 1, wherein the fm signal circuit further comprises a first inductor and a second capacitor, a first end of the first electronic switch is connected to a first end of the second capacitor, a second end of the second capacitor is connected to a first end of the first inductor, and a second end of the first inductor is connected to a fm receiver of the car radio.
6. The radio signal selection circuit according to claim 5, wherein the frequency modulation signal circuit further comprises a second inductor, a second terminal of the second capacitor is connected to a first terminal of the second inductor, and a second terminal of the second inductor is connected to ground.
7. The radio signal selection control circuit according to claim 1, wherein the amplitude modulation signal circuit further comprises a third capacitor, a second terminal of the amplitude modulation inductor is connected to a first terminal of the third capacitor, and a second terminal of the third capacitor is connected to the control terminal of the second electronic switching tube.
8. The radio signal selection circuit according to claim 1, wherein the amplitude modulation signal circuit further comprises a fourth capacitor, a second terminal of the amplitude modulation inductor is connected to a first terminal of the fourth capacitor, and a second terminal of the fourth capacitor is connected to ground.
9. The radio signal selection and control circuit as claimed in claim 1, wherein the amplitude modulation signal circuit further comprises a fifth capacitor, the first terminal of the second electronic switch tube is connected to the first terminal of the fifth capacitor, and the second terminal of the fifth capacitor is connected to the amplitude modulation receiving terminal of the car radio.
10. A car radio system comprising a radio signal selection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122634832.7U CN216531296U (en) | 2021-10-28 | 2021-10-28 | Radio signal selection control circuit and vehicle-mounted radio system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122634832.7U CN216531296U (en) | 2021-10-28 | 2021-10-28 | Radio signal selection control circuit and vehicle-mounted radio system |
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| CN216531296U true CN216531296U (en) | 2022-05-13 |
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| CN202122634832.7U Active CN216531296U (en) | 2021-10-28 | 2021-10-28 | Radio signal selection control circuit and vehicle-mounted radio system |
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