CN218829913U

CN218829913U - Frequency modulation receiver capable of automatically switching receiving frequency

Info

Publication number: CN218829913U
Application number: CN202222944611.4U
Authority: CN
Inventors: 耿宇航; 李来军; 康慧珏; 黄国燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-04-07
Anticipated expiration: 2032-11-03

Abstract

The utility model discloses a but automatic switch receiving frequency's FM receiver, including the earphone shell, install speaker and circuit module in the earphone shell, its circuit module includes a plurality of outer accuse buttons, host system and two FM receiving module who receives different frequency radio stations, two FM receiving module frequency modulations of host system control, host system is equipped with the signal selection submodule piece, the signal frequency or/and the signal strength that each FM receiving module of signal selection submodule piece comparison received, host system exports one of them radio station signal to speaker according to the comparative result. The two frequency modulation receiving modules are used for simultaneously receiving radio stations with different frequencies, and the signal selection submodule compares the signal frequency or/and the signal strength of the two radio stations and outputs one radio station signal. The two radio station signals have the mutual standby function, the master control module automatically switches the radio station with the stronger output signal, and the examination accident caused by the failure of the playback radio station in a large foreign language listening examination is avoided.

Description

Frequency modulation receiver capable of automatically switching receiving frequency

Technical Field

The utility model relates to a but frequency modulation receiver of automatic switch-over receiving frequency.

Background

When the existing frequency modulation receiver is used for frequency modulation, only one frequency can be received, and if other frequencies are received, manual frequency modulation is needed. When a national large foreign language listening test is carried out, in order to ensure that the test is smoothly carried out, two signals of a main station and a standby station are simultaneously generated, and a standby student can receive the signal of the standby station to carry out the test when the main station playing the listening test breaks down. However, after the signal of the main station is interrupted, the existing FM earphone worn by the examinee or the FM radio used by the examination hall needs to be manually modulated by the student or the teacher to the frequency of the standby station for receiving, and the time and other uncertain factors needed in the process often cause examination accidents! Not only the examination score of the student is influenced, but also the psychology of the student is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a but automatic switch receives FM receiver of frequency for solve among the prior art problem that FM earphone can only receive a radio station frequency.

The technical scheme of the utility model is realized like this:

the utility model aims at providing a but FM receiver of automatic switch-over receiving frequency, including earphone shell, install speaker and the circuit module in earphone shell, its characterized in that: the circuit assembly comprises a plurality of external control buttons, a master control module and two frequency modulation receiving modules for receiving radio stations with different frequencies, wherein each external control button is connected with the input end of the master control module, the master control module comprises a signal selection submodule and a frequency modulation submodule, the frequency modulation submodule controls the frequency modulation of the two frequency modulation receiving modules, the signal selection submodule compares the frequency or/and the strength of signals received by each frequency modulation receiving module, and the master control module outputs one of the radio station signals to a loudspeaker according to the comparison result.

Further, the two frequency modulation receiving modules are specifically a main frequency modulation receiving module and an auxiliary frequency modulation receiving module, and the frequency modulation submodule modulates the frequency of the main frequency modulation receiving module according to the external control button and modulates the frequency of the auxiliary frequency modulation receiving module according to the signal frequency received by the main frequency modulation receiving module.

Furthermore, the main control module comprises a main control chip and a power amplifier chip, the signal selection submodule and the frequency modulation submodule are arranged in the main control chip, each external control button is correspondingly connected with a plurality of control input ports of the main control chip, the main frequency modulation receiving module and the auxiliary frequency modulation receiving module are connected with the main control chip, the main control chip outputs audio selection signals to a power-down control end of the power amplifier chip, a first positive audio output end of the main frequency modulation receiving module and a first positive audio output end of the auxiliary frequency modulation receiving module are connected with a first input end of the power amplifier chip, a first negative audio output end of the main frequency modulation receiving module and a second negative audio output end of the auxiliary frequency modulation receiving module are connected, and an output end of the power amplifier chip is connected with a loudspeaker.

Furthermore, the first data output end of the main frequency modulation receiving module, the second data output end of the auxiliary frequency modulation receiving module, the first clock output end of the main frequency modulation receiving module, and the second clock output end of the auxiliary frequency modulation receiving module are respectively and correspondingly connected with the plurality of signal input ports of the main control chip, the first output end of the main control chip is connected with the first input end of the main frequency modulation receiving module, and the second output end of the main control chip is connected with the second input end of the auxiliary frequency modulation receiving module.

The beneficial effects of the utility model are that:

the frequency modulation receiver capable of automatically switching receiving frequencies simultaneously receives two radio stations with different frequencies through the two frequency modulation receiving modules, the signal selection submodule compares the signal frequency or/and the signal strength of the two radio stations, and then outputs one radio station signal to the loudspeaker. The two radio station signals have a mutual standby function, when the output radio station signal fails, the main control module automatically switches to output the other radio station, and the examination accidents caused by the failure of the playback radio station in examinations of large foreign language listening parts in China are avoided. The smooth proceeding of the examination is ensured.

But frequency modulation receiver of automatic switch-over receiving frequency, circuit module simple structure, with low costs, output effect is stable.

Other advantages of the present invention will be described in detail in the examples section.

Drawings

Fig. 1 is a schematic structural diagram of a fm receiver capable of automatically switching receiving frequencies according to an embodiment of the present invention;

fig. 2 is a block diagram of an electrographic component of an fm receiver capable of automatically switching receiving frequencies according to an embodiment of the invention;

fig. 3 is a schematic connection diagram of a preferred electrographic assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the present embodiment provides a fm receiver capable of automatically switching a receiving frequency, including a headphone housing 1, a speaker 3 mounted in the headphone housing 1, and a circuit assembly 2, wherein: the circuit component 2 comprises a plurality of external control buttons 21, a main control module 22 and two frequency modulation receiving modules 23 for receiving radio stations with different frequencies, each external control button 21 is connected with the input end of the main control module 22, the main control module 22 comprises a signal selection sub-module 2213 and a frequency modulation sub-module 2214, the frequency modulation sub-module 2214 controls the frequency modulation of the two frequency modulation receiving modules, the signal selection sub-module 2213 compares the frequency or/and the strength of signals received by each frequency modulation receiving module, and the main control module 22 outputs one of the radio station signals to the loudspeaker 3 according to the comparison result.

The fm receiver capable of automatically switching receiving frequencies simultaneously receives two radio stations with different frequencies through two fm receiving modules 23, and the signal selecting sub-module 2213 compares the signal frequencies or/and the signal strengths of the two radio stations and outputs one of the radio station signals to the speaker. The two radio station signals have a mutual standby function, when the output radio station signal has a fault, the main control module 22 automatically switches to output the other radio station, and the examination accidents caused by the fault of the playback radio station can be avoided in the examination of the national large-scale foreign language listening parts. The smooth proceeding of the examination is ensured. The circuit assembly has the advantages of simple structure, low cost and stable output effect.

Further, the two fm receiving modules 23 are specifically a main fm receiving module 231 and an auxiliary fm receiving module 232, and the fm sub-module 2214 modulates the frequency of the main fm receiving module 231 according to the external control button 21, and then modulates the frequency of the auxiliary fm receiving module 232 according to the frequency of the signal received by the main fm receiving module 231.

Specifically, the frequency of the master station received by the master fm receiving module 231 is M, and the frequency of the slave station received by the slave fm receiving module 232 is N. When the frequency M of the main station is within the range of 88MHZ to 108MHZ, the auxiliary frequency modulation receiving module 232 does not perform frequency modulation work, and the main control module 22 only outputs the frequency M of the main station; when the frequency M of the main station is within the range of 50MHz-88MHz, the main control module 22 controls the secondary frequency modulation receiving module 232 to perform frequency modulation according to the following method: n = M-X, X takes the value 0-38MHz.

The main control module 22 automatically controls the auxiliary frequency modulation receiving module 232 to modulate frequency, and is convenient and practical.

Referring to fig. 3, further, the main control module 22 includes a main control chip 221 and a power amplifier chip 222, a signal selection sub-module 2213 and a frequency modulation sub-module 2214 are embedded IN the main control chip 221, each external control button 21 is correspondingly connected to a plurality of control input ports 2212 of the main control chip 221, the main modulation receiving module 231 and the secondary modulation receiving module 232 are connected to the main control chip 221, the main control chip 221 outputs an audio selection signal SD to a power-down control terminal shutdown of the power amplifier chip 222, a first positive audio output terminal LOUT of the main modulation receiving module 231 and a first positive audio output terminal TU-L of the secondary modulation receiving module 232 are connected to a first input terminal IN1 of the power amplifier chip 222, a first negative audio output terminal ROUT of the main modulation receiving module 231 and a second negative audio output terminal TU-R of the secondary modulation receiving module 232, and an output terminal OUT-L, OUT-R of the power amplifier chip 222 is connected to a speaker 3. The main control module 22 has a simple structure, compares the signal intensity of the two frequency modulation receiving modules through software, and is convenient and quick; the output of the power amplifier chip 222 is controlled by the level of the audio selection signal SD of the main control chip 221, so that the switching is convenient and the output signal is stable.

Further, the first data output terminal SDA1 of the main FM receiving module 231, the second data output terminal SDA2 of the sub FM receiving module 232, the first clock output terminal SCL1 of the main FM receiving module 231, and the second clock output terminal SCL2 of the sub FM receiving module 232 are correspondingly connected to the signal input ports 2211 of the main control chip 221, the first output terminal ANT1 of the main control chip 221 is connected to the first input terminal FM1 of the main FM receiving module 231, and the second output terminal ANT2 of the main control chip 221 is connected to the second input terminal FM2 of the sub FM receiving module 232. The main control chip 221 is simply connected with the main frequency modulation receiving module 231 and the auxiliary frequency modulation receiving module 232.

Specifically, after the frequency modulation is finished, the main control chip 221 automatically records or receives signals of the main station and the auxiliary station, and when only one of the signals of the main station and the auxiliary station can be received, the main control chip 221 automatically outputs the received corresponding station signal; when the signals of the main station and the auxiliary station are received at the same time, the signal of the main station is output first, the strength of the signals of the two stations is compared at the same time, and when the signal of the auxiliary station is stronger than that of the main station, the signal of the auxiliary station is switched and output.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A FM receiver capable of automatically switching receiving frequency, comprising a headphone housing (1), a speaker (3) and a circuit assembly (2) installed in the headphone housing (1), characterized in that: the circuit assembly (2) comprises a plurality of external control buttons (21), a main control module (22) and two frequency modulation receiving modules for receiving radio stations with different frequencies, each external control button (21) is respectively connected with the main control module (22), the main control module (22) comprises a signal selection submodule (2213) and a frequency modulation submodule (2214), the frequency modulation submodule (2214) controls the frequency modulation of the two frequency modulation receiving modules, the signal selection submodule (2213) compares the frequency or/and the strength of signals received by each frequency modulation receiving module, and the main control module (22) outputs one of the radio station signals to the loudspeaker (3) according to the comparison result.

2. A fm receiver according to claim 1 wherein the receiver is capable of automatically switching the reception frequency between: the two frequency modulation receiving modules are a main frequency modulation receiving module (231) and an auxiliary frequency modulation receiving module (232), the frequency modulation sub-module (2214) performs frequency modulation on the main frequency modulation receiving module (231) according to the external control button (21), and then performs frequency modulation on the auxiliary frequency modulation receiving module (232) according to the signal frequency received by the main frequency modulation receiving module (231).

3. A fm receiver according to claim 2 wherein the receiver is capable of automatically switching the receive frequency: the main control module (22) comprises a main control chip (221) and a power amplifier chip (222), a signal selection submodule (2213) and a frequency modulation submodule (2214) are arranged IN the main control chip (221), each external control button (21) is correspondingly connected with a plurality of control input ports (2212) of the main control chip (221), a main frequency modulation receiving module (231) and an auxiliary frequency modulation receiving module (232) are connected with the main control chip (221), the main control chip (221) outputs an audio selection signal SD to a power-down control end SHUTDOWM of the power amplifier chip (222), a first positive audio output end LOUT of the main frequency modulation receiving module (231), a first positive audio output end TU-L of the auxiliary frequency modulation receiving module (232) are connected with a first input end IN1 of the power amplifier chip (222), a first negative audio output end ROUT of the main frequency modulation receiving module (231), a second negative audio output end TU-R of the auxiliary frequency modulation receiving module (232), and an output end OUT-8978-zx8978-R of the power amplifier chip (222) are connected with a loudspeaker (3).

4. A fm receiver according to claim 3 wherein the receiver is capable of automatically switching the receive frequency: the first data output end SDA1 of the main frequency modulation receiving module (231), the second data output end SDA2 of the auxiliary frequency modulation receiving module (232), the first clock output end SCL1 of the main frequency modulation receiving module (231), and the second clock output end SCL2 of the auxiliary frequency modulation receiving module (232) are respectively and correspondingly connected with a plurality of signal input ports (2211) of the main control chip (221), the first output end ANT1 of the main control chip (221) is connected with the first input end FM1 of the main frequency modulation receiving module (231), and the second output end ANT2 of the main control chip (221) is connected with the second input end FM2 of the auxiliary frequency modulation receiving module (232).