FM receiving circuit

A receiving circuit and capacitor technology, which is applied in telephone communication, electrical components, telephone structure, etc., can solve the problems of increasing cost and increasing the difficulty of antenna design, etc., and achieve the effect of reducing space occupation and compact equipment structure

Inactive Publication Date: 2019-03-26
深圳市展睿智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] FM radio is a way of transmitting radio through wireless transmission. It has the characteristics of beautiful and clear sound quality. Today, when digital communication is prevalent, there are still a large number of audiences. Therefore, mobile phones often have the function of receiving FM signals, and mobile phones are used as The biggest problem of the FM receiving terminal is the antenna design. The existing FM reception

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1

[0018] See Figure 1 to Figure 3 , An FM receiving circuit, including an FM signal processing unit, a filter unit 2, a coupling isolation unit 1, and a speaker unit, the negative electrode of the speaker unit is connected to the negative output of the audio power amplifier unit, and the positive electrode of the speaker unit is connected to the audio power amplifier unit The input terminal of the coupling isolation unit 1 is coupled to the negative terminal of the speaker unit, the output terminal of the coupling isolation unit 1 is connected to the input terminal of the filter unit 2, and the filter unit 2 The output terminal is connected with the input terminal of the FM signal processing unit.

[0019] In this embodiment, the circuit uses the coil in the horn necessary in the mobile phone as the FM antenna to receive FM signals. The horn includes a coil and a magnetic core. The magnetic core can be used to stabilize the frequency and ensure the reliability of...

Example Embodiment

[0023] Example 2

[0024] On the basis of embodiment 1, the coupling isolation unit includes a coupling isolation capacitor, the input end of the coupling isolation capacitor is coupled to the negative electrode of the speaker unit, and the output end of the coupling isolation capacitor is connected to the filter The input of the unit.

[0025] In this embodiment, the coupling isolation capacitor of the coupling isolation unit is used to extract high-frequency signals from the signal line of the speaker, and to isolate audio signals.

Example Embodiment

[0026] Example 3

[0027] On the basis of Embodiment 2, the filter unit 2 includes a first capacitor, a first inductor, a second capacitor, and a third capacitor, and the input end of the first capacitor is connected to the output end of the coupling isolation unit 1, and The output end of the first capacitor is connected to one end of the first inductor, the other end of the first inductor is connected to the output end of the filter unit 2, and one end of the second capacitor is connected to one end of the first inductor. The other end is grounded, one end of the third capacitor is connected to the other end of the first inductor, and the other end of the third capacitor is grounded.

[0028] In this embodiment, the filter unit is used to filter the high-frequency signal obtained by coupling to remove clutter signals outside the frequency band of the FM signal.

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Abstract

The invention provides an FM receiving circuit. The FM receiving circuit comprises an FM signal processing unit, a filtering unit, a coupling and isolation unit, and a loudspeaker unit. The negative pole of the speaker unit is connected to the negative output end of an audio power amplifier unit, and the positive pole of the speaker unit is connected to the positive output end of the audio power amplifier unit. The input end of the coupling and isolation unit is coupled to the negative end of the loudspeaker unit, and the output end of the coupling and isolation unit is connected to the inputend of the filtering unit. And the output end of the filtering unit is connected to the input end of the FM signal processing unit. According to the FM receiving circuit, the circuit has the beneficial effects that the circuit using the coil of a speaker as an FM antenna is provided, so that the FM radio reception effect of the device can be realized without an additional chip or a matching circuit; the space occupation of the circuit board of the device is greatly reduced; and the structure of the device can be more compact.

Description

technical field [0001] The invention relates to the field of FM reception, in particular to an FM reception circuit. Background technique [0002] FM radio is a way of transmitting radio through wireless transmission. It has the characteristics of beautiful and clear sound quality. Today, when digital communication is prevalent, there are still a large number of audiences. Therefore, mobile phones often have the function of receiving FM signals, and mobile phones are used as The biggest problem of the FM receiving terminal is the antenna design. The existing FM reception of mobile phones mainly includes: using the earphone cable as the FM antenna, or sharing the GSM antenna or the specially designed patch FM antenna to realize the FM signal reception of the mobile phone. However, there are disadvantages in the above methods, such as the need for additional wiring, increasing the difficulty of antenna design and increasing the cost. Therefore, it is necessary to innovate the ...

Claims

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Application Information

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IPC IPC(8): H04B1/08H04B1/16H04M1/02
CPCH04B1/086H04B1/16H04M1/026
Inventor 杨孝忠
Owner 深圳市展睿智能科技有限公司
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