WO2018107672A1 - Frequency-modulated receiving circuit, lamp and audio playback method thereof - Google Patents

Frequency-modulated receiving circuit, lamp and audio playback method thereof Download PDF

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Publication number
WO2018107672A1
WO2018107672A1 PCT/CN2017/087147 CN2017087147W WO2018107672A1 WO 2018107672 A1 WO2018107672 A1 WO 2018107672A1 CN 2017087147 W CN2017087147 W CN 2017087147W WO 2018107672 A1 WO2018107672 A1 WO 2018107672A1
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WIPO (PCT)
Prior art keywords
receiving
frequency
electrically connected
amplifier
microprocessor
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PCT/CN2017/087147
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French (fr)
Chinese (zh)
Inventor
黄新
陈辉萍
张文彬
汪序凯
朱荆莲
彭灵
俞伟良
钟城广
肖胜男
王炳锋
黄睿
陈海裕
黄广亮
陈进银
张燕
唐志元
王岩
Original Assignee
深圳佳比泰智能照明股份有限公司
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Publication of WO2018107672A1 publication Critical patent/WO2018107672A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups

Definitions

  • the invention relates to the technical field of frequency modulation communication, in particular to an FM receiving circuit, a lamp and an audio playing method thereof.
  • the object of the present invention is to provide a frequency modulation receiving circuit, a lamp and an audio playing method thereof, which solve the problem that the remote control technology has weak anti-interference ability, is inconvenient in networking, has high reliability, and is difficult to realize a group between multiple music light sources.
  • the network function does not solve the technical solution of the lighting music networking through frequency modulation.
  • the present invention provides a frequency modulation receiving circuit, including:
  • An FM receiving antenna for receiving a frequency modulated signal
  • the FM receiving chip is electrically connected to the FM receiving antenna
  • a receiving frequency encoding switch for adjusting a receiving frequency point, electrically connected to the receiving microprocessor
  • An amplifier electrically connected to the FM receiving chip
  • a speaker is electrically connected to the amplifier.
  • the method further includes:
  • the power supply device is electrically connected to the amplifier, the FM receiving chip, and the receiving microprocessor.
  • the power supply device includes:
  • a power supply circuit for providing a first voltage, electrically connected to the amplifier
  • a voltage stabilizing circuit for connecting the first voltage to output a second voltage, wherein an input end is connected to the power supply circuit, and an output end thereof is electrically connected to the FM receiving chip and the receiving microprocessor.
  • the receiving frequency encoding switch includes three sub-switches connected in parallel to switch the receiving frequency point of the FM receiving antenna.
  • the method further includes:
  • a receiving LED for displaying a state of receiving the FM signal is electrically connected to the receiving microprocessor.
  • the amplifier is a class AB amplifier.
  • a luminaire including an FM receiving circuit as described above.
  • an audio playback method for a luminaire providing one or more luminaires as described above, including the steps of:
  • the amplified audio signal is played through the speaker.
  • the step of controlling the receiving frequency point of the FM receiving antenna by the receiving microprocessor and the receiving frequency encoding switch comprises the following sub-steps:
  • the receiving frequency point is determined according to the states of the three sub-switches.
  • the method further includes the steps of:
  • the FM receiving chip and the receiving microprocessor are powered by a second voltage.
  • the beneficial effects of the present invention are that, by setting different frequency points to receive external audio signals by frequency modulation, not only the anti-interference ability of the remote control technology is improved, but also the reliability of the smart home communication is improved; by setting a plurality of speaker nodes or lamps Realize the music networking function between multiple nodes or lamps to improve people's life experience and enrich the smart home control function.
  • FIG. 1 is a block diagram of a frequency modulation receiving circuit provided by the present invention.
  • FIG. 2 is a schematic structural diagram of a frequency modulation receiving antenna, a frequency modulation receiving chip, a receiving microprocessor, and a receiving frequency encoding switch according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of an amplifier, a horn, and a power supply device according to an embodiment of the present invention.
  • the invention provides an FM receiving circuit 100, a lamp and an audio playing method thereof, the purpose of which is to receive an external audio signal through frequency modulation communication, improve the anti-interference ability of the remote control technology by setting different frequency points, and improve the reliability of the smart home communication.
  • Sexuality by setting up multiple speakers 6 nodes or lamps to achieve music networking functions between multiple nodes or lamps, improve people's life experience, enrich the smart home control functions.
  • FIG. 1 is a block diagram of a frequency modulation receiving circuit 100 according to the present invention.
  • the FM receiving circuit 100 includes an FM receiving antenna 1, a FM receiving chip 2, a receiving microprocessor 3, a receiving frequency encoding switch 4, and an amplifier. 5 and speaker 6.
  • the FM receiving antenna 1 is for receiving a frequency modulated signal, and the frequency range of the receiving is 88 MHz-110 MHz.
  • the FM receiving chip 2 is electrically connected to the FM receiving antenna 1; see FIG. 2, FIG. 2 is an FM receiving antenna 1, an FM receiving chip 2, a receiving microprocessor 3, and receiving according to an embodiment of the present invention.
  • Schematic diagram of the frequency encoding switch 4 the FM receiving chip 2 is U2 in FIG. 2, the port FMIN is connected to one end of the capacitor C25, and the other end of the capacitor C25 is connected to one end of the capacitor C10, one end of the inductor L5, and one end of the capacitor C11.
  • the other end of the capacitor C10 and the other end of the inductor L5 are grounded, the other end of the capacitor C11 is connected to one end of the inductor L4, and the other end of the inductor L4 is connected to the FM receiving antenna 1.
  • the receiving microprocessor 3 is electrically connected to the FM receiving chip 2; the receiving microprocessor 3 is the MCU 2 in FIG. 2, its port 5 is connected to the port SDA of U2, and the port 6 is connected to the port SCLK of U2.
  • the receiving frequency encoding switch 4 for adjusting the receiving frequency point is electrically connected to the receiving microprocessor 3; the receiving frequency encoding switch 4 comprises three sub-switches connected in parallel to switch the receiving frequency of the FM receiving antenna 1 point.
  • the three sub-switches are sub-switch A, sub-switch B and sub-switch C, one end of sub-switch A, sub-switch B and sub-switch C are grounded, and the other end of sub-switch A is connected to port 3 of MCU 2 through resistor R17.
  • the other end of the sub-switch B is connected to the port 4 of the MCU 2 via a resistor R14, and the other end of the sub-switch C is connected to the port 7 of the MCU 2 via a resistor R21.
  • the amplifier 5 is electrically connected to the FM receiving chip 2; the amplifier 5 is a class AB amplifier 5, and the class AB amplifier 5 is a combination device of the class A and class B amplifiers 5 depending on the magnitude and output level of the bias current.
  • the bias of the class AB amplifier 5 is between the class A amplifier 5 and the class B amplifier 5.
  • the efficiency of class AB is much greater than that of class A amplifier 5 and slightly lower than class B amplifier 5.
  • the bias of the class AB amplifier 5 allows the working sections of the two transistors operating in the push-pull mode to overlap each other. At the same time, since the class AB amplifier does not interfere with the FM receiving band, it is very suitable for this device. Referring to FIG. 3, FIG.
  • FIG. 3 is a schematic structural diagram of an amplifier 5, a horn 6 and a power supply device 7 according to an embodiment of the present invention.
  • the amplifier 5 is U3 in FIG. 3, and the port 4 sequentially passes through a resistor R36, a capacitor C32, and an inductor L7. Resistor R34 and capacitor C28 are connected to interface 101. As shown in Figure 2, interface 101 is coupled via resistor R33 to port ROUT of U2. Port 3 of U3 is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to one end of the capacitor C30 and connected between the inductor L7 and the resistor R34. The other end of the capacitor C30 is connected to one end of the capacitor C29 and connected to the resistor R34.
  • the interface 102 is connected to the port LOUT of U2 through a resistor R31.
  • Port 2 of U3 is connected to one end of capacitor C34, the other end of C34 is connected to one end of resistor R20 and one end of resistor R18, the other end of resistor R18 is connected to capacitor C13, and the other end of capacitor C13 is connected. Connected between inductor L7 and resistor R34.
  • the horn 6 is electrically connected to the amplifier 5.
  • One end of the speaker 6 is connected to one end of the capacitor C15 and one end of the inductor L2
  • the other end of the speaker 6 is connected to one end of the capacitor C16 and one end of the inductor L3
  • the other end of the inductor L2 is connected to the port 5 of the U3, and the other end of the inductor L3 Connect to port 8 of U3.
  • the FM receiving circuit 100 further includes a power supply device 7 electrically connected to the amplifier 5, the FM receiving chip 2, and the receiving microprocessor 3.
  • the power supply device 7 includes a power supply circuit 71 and a voltage stabilization circuit 72.
  • the power supply circuit 71 is configured to provide a first voltage electrically connected to the port 6 of the amplifier 5; the first voltage is preferably +3.6-8V.
  • a voltage stabilizing circuit 72 for connecting the first voltage to output a second voltage, an input end of which is connected to the power supply circuit 71, an output end of which is electrically connected to the FM receiving chip 2 and the receiving micro processing Device 3.
  • the second voltage is preferably 3.3V, and the second voltage is connected to port 1 of MCU2 and port VDD of U2.
  • the FM receiving circuit 100 further includes a receiving LED lamp RX-LED, and a receiving LED lamp for receiving the FM signal RX-LED for displaying the FM signal receiving state, and is electrically connected to the receiving microprocessor 3 .
  • the anode of the receiving LED lamp RX-LED is connected to port 2 of the MCU 2 via a resistor R16.
  • the FM receiving circuit 100 can be applied to a luminaire, such as a downlight, to achieve an indoor surround sound effect by installing a plurality of downlights including the FM receiving circuit 100 at different positions of a ceiling in the same room.
  • the FM transmitter has two audio inputs: wired input and wireless input.
  • the wired input can be connected to the audio signal of the TV, CD player or other device through the AUX interface on the transmitter; the wireless input is connected via Bluetooth.
  • the audio signal played by the Bluetooth paired mobile phone can be transmitted out for playing by multiple receiving units, thereby realizing the interaction between the light and the music. It can be installed indoors from the audio, such as next to the TV set.
  • the FM transmitter By setting the FM transmitter, the sound of the TV set is sent to the plurality of receiving units through the FM transmitter, and the plurality of receiving units can pass the FM receiving circuit 100. Sound at the same time.
  • an audio playback method for a luminaire is provided, providing one or more luminaires as described above, such as mounting a plurality of downlights, including steps S1-S5:
  • step S1 controlling, by the receiving microprocessor 3 and the receiving frequency encoding switch 4, a receiving frequency point of the FM receiving antenna 1; for example, each downlight is encoded by the receiving microprocessor 3 and the receiving frequency
  • the switch 4 controls the receiving frequency point of the FM receiving antenna 1, and the step S1 includes sub-steps S11-S12:
  • F1 F2 F3 F4 F5 F6 F7 F8 A 0 0 0 1 1 1 1 B 0 0 1 1 0 0 1 1 C 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
  • S12. Determine the receiving frequency point according to states of the three sub-switches. For example, f1 is 88 MHz.
  • f1 is 88 MHz.
  • each of the downlights receives an external frequency modulated signal according to the receiving frequency point through the FM receiving antenna 1.
  • each of the downlights converts the FM signal into an audio signal through the FM receiving chip 2.
  • the audio signal is amplified by the amplifier 5.
  • each of the downlights amplifies the audio signal through the amplifier 5.
  • the amplified audio signal is played by the speaker 6.
  • each of the downlights plays the amplified audio signal through the speaker 6.
  • the effect of indoor surround sound can be achieved by installing a plurality of downlights including the FM receiving circuit 100 at different positions of the ceiling in the same room.
  • the audio playing method further includes steps S6-S7:
  • the amplifier 5 is powered by a first voltage.
  • the first voltage is preferably +3.6-8V.
  • the FM receiving chip 2 and the receiving microprocessor 3 are powered by a second voltage.
  • the second voltage is preferably +3.3V. Since the lamp itself has a power take-off wire, it is not necessary to additionally provide an external wire, and it is only necessary to connect the power supply circuit 71 to the power supply line of the lamp itself. Reasonable use of the resources of the lamps themselves, saving costs.
  • the one or operations may constitute computer readable instructions stored on one or a computer readable medium that, when executed by an electronic device, cause the computing device to perform the operations.
  • the order in which some or all of the operations are described should not be construed as implying that the operations must be sequential. Those skilled in the art will appreciate alternative rankings that have the benefit of this specification. Moreover, it should be understood that not all operations must be present in every embodiment provided herein.
  • the word "preferred” as used herein is intended to serve as an example, instance, or illustration. Any aspect or design described as “preferred” by the text is not necessarily to be construed as being more advantageous than other aspects or designs. Instead, the use of the word “preferred” is intended to present a concept in a specific manner.
  • the term “or” as used in this application is intended to mean an “or” or “an” That is, unless otherwise specified or clear from the context, "X employs A or B” means naturally including any one of the permutations. That is, if X uses A; X uses B; or X uses both A and B, then "X uses A or B" is satisfied in any of the foregoing examples.
  • Each functional unit in the embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

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Abstract

Disclosed are a frequency-modulated receiving circuit, a lamp, and an audio playback method thereof. The frequency-modulated receiving circuit comprises: a frequency-modulated receiving antenna used for receiving a frequency-modulated signal; a frequency-modulated receiving chip electrically connected to the frequency-modulated receiving antenna; a receiving microprocessor electrically connected to the frequency-modulated receiving chip; a received frequency coding switch used for adjusting a received frequency point and electrically connected to the receiving microprocessor; an amplifier electrically connected to the frequency-modulated receiving chip; and a loudspeaker electrically connected to the amplifier. The present invention has the following beneficial effects: by configuring different frequency points for frequency-modulated reception of external audio signals, not only anti-interference capability of a remote control technology is improved, but also communication reliability of smart home is improved; and by configuring a plurality of loudspeaker nodes or lamps and achieving a music networking function between the plurality of nodes or lamps, people's life experience is improved and smart home control functions are enriched.

Description

一种调频接收电路、灯具及其音频播放方法Frequency modulation receiving circuit, lamp and audio playing method thereof 技术领域Technical field
本发明涉及调频通信技术领域，尤其涉及一种调频接收电路、灯具及其音频播放方法。The invention relates to the technical field of frequency modulation communication, in particular to an FM receiving circuit, a lamp and an audio playing method thereof.
背景技术Background technique
随着音乐光源技术的普及，越来越多的音乐光源进入到人们的生活中。目前通过智能家居遥控音乐光源的技术较为成熟，但是这种遥控技术抗干扰能力弱，组网不便，可靠性一般。而且现有技术中，难以实现多个音乐光源之间的组网功能，更没有通过调频实现灯具音乐组网的技术方案。With the popularity of music light source technology, more and more music light sources have entered people's lives. At present, the technology of remotely controlling the music source through the smart home is relatively mature, but the remote control technology has weak anti-interference ability, inconvenient networking, and high reliability. Moreover, in the prior art, it is difficult to realize the networking function between multiple music light sources, and there is no technical solution for implementing the music music networking of the lamps through frequency modulation.
发明内容Summary of the invention
本发明的目的在于提供一种调频接收电路、灯具及其音频播放方法，解决现有技术中遥控技术抗干扰能力弱，组网不便，可靠性一般，并且难以实现多个音乐光源之间的组网功能，没有通过调频实现灯具音乐组网的技术方案的问题。The object of the present invention is to provide a frequency modulation receiving circuit, a lamp and an audio playing method thereof, which solve the problem that the remote control technology has weak anti-interference ability, is inconvenient in networking, has high reliability, and is difficult to realize a group between multiple music light sources. The network function does not solve the technical solution of the lighting music networking through frequency modulation.
本发明的技术方案实现如下：The technical solution of the present invention is implemented as follows:
一方面，本发明提供一种调频接收电路，包括：In one aspect, the present invention provides a frequency modulation receiving circuit, including:
用于接收调频信号的调频接收天线；An FM receiving antenna for receiving a frequency modulated signal;
调频接收芯片，电性连接于所述调频接收天线；The FM receiving chip is electrically connected to the FM receiving antenna;
接收微处理器，电性连接于所述调频接收芯片；Receiving a microprocessor electrically connected to the FM receiving chip;
用于调节接收频点的接收频率编码开关，电性连接于所述接收微处理器；a receiving frequency encoding switch for adjusting a receiving frequency point, electrically connected to the receiving microprocessor;
放大器，电性连接于所述调频接收芯片；An amplifier electrically connected to the FM receiving chip;
喇叭，电性连接于所述放大器。A speaker is electrically connected to the amplifier.
在本发明所述的调频接收电路中，还包括： In the FM receiving circuit of the present invention, the method further includes:
供电装置，电性连接于所述放大器、所述调频接收芯片及所述接收微处理器。The power supply device is electrically connected to the amplifier, the FM receiving chip, and the receiving microprocessor.
在本发明所述的调频接收电路中，所述供电装置包括：In the FM receiving circuit of the present invention, the power supply device includes:
用于提供第一电压的供电电路，电性连接于所述放大器；a power supply circuit for providing a first voltage, electrically connected to the amplifier;
用于接入所述第一电压以输出第二电压的稳压电路，其输入端连接于所述供电电路，其输出端电性连接于所述调频接收芯片及所述接收微处理器。And a voltage stabilizing circuit for connecting the first voltage to output a second voltage, wherein an input end is connected to the power supply circuit, and an output end thereof is electrically connected to the FM receiving chip and the receiving microprocessor.
在本发明所述的调频接收电路中，所述接收频率编码开关包括三个相互并联的子开关，以切换所述调频接收天线的接收频点。In the FM receiving circuit of the present invention, the receiving frequency encoding switch includes three sub-switches connected in parallel to switch the receiving frequency point of the FM receiving antenna.
在本发明所述的调频接收电路中，还包括：In the FM receiving circuit of the present invention, the method further includes:
用于显示调频信号接收状态的接收LED灯，电性连接于所述接收微处理器。A receiving LED for displaying a state of receiving the FM signal is electrically connected to the receiving microprocessor.
在本发明所述的调频接收电路中，所述放大器为AB类放大器。In the FM receiving circuit of the present invention, the amplifier is a class AB amplifier.
一方面，提供一种灯具，包括如上所述的调频接收电路。In one aspect, a luminaire is provided, including an FM receiving circuit as described above.
一方面，提供一种灯具的音频播放方法，提供一至多个如上所述的灯具，包括步骤：In one aspect, an audio playback method for a luminaire is provided, providing one or more luminaires as described above, including the steps of:
通过所述接收微处理器及所述接收频率编码开关控制所述调频接收天线的接收频点；Controlling, by the receiving microprocessor and the receiving frequency encoding switch, a receiving frequency point of the FM receiving antenna;
通过所述调频接收天线按照所述接收频点接收外部的调频信号；Receiving, by the FM receiving antenna, an external frequency modulated signal according to the receiving frequency point;
通过所述调频接收芯片将所述调频信号转换为音频信号；Converting the FM signal into an audio signal by the FM receiving chip;
通过所述放大器对所述音频信号放大；Amplifying the audio signal by the amplifier;
通过所述喇叭播放经放大后的音频信号。The amplified audio signal is played through the speaker.
在本发明所述的音频播放方法中，所述通过所述接收微处理器及所述接收频率编码开关控制所述调频接收天线的接收频点的步骤包括以下子步骤：In the audio playing method of the present invention, the step of controlling the receiving frequency point of the FM receiving antenna by the receiving microprocessor and the receiving frequency encoding switch comprises the following sub-steps:
通过所述接收微处理器获取所述接收频率编码开关的三个子开关的状态；Acquiring, by the receiving microprocessor, a state of three sub-switches of the receiving frequency encoding switch;
依据三个所述子开关的状态确定所述接收频点。The receiving frequency point is determined according to the states of the three sub-switches.
在本发明所述的音频播放方法中，还包括步骤：In the audio playing method of the present invention, the method further includes the steps of:
通过第一电压为所述放大器供电；Powering the amplifier through a first voltage;
通过第二电压为所述调频接收芯片及所述接收微处理器供电。 The FM receiving chip and the receiving microprocessor are powered by a second voltage.
因此，本发明的有益效果是，通过设置不同频点以调频接收外部的音频信号，不仅提高了遥控技术的抗干扰能力，还提高了智能家居通信的可靠性；通过设置多个喇叭节点或者灯具实现多个节点或灯具之间的音乐组网功能，提高人们的生活体验，丰富了智能家居控制功能。Therefore, the beneficial effects of the present invention are that, by setting different frequency points to receive external audio signals by frequency modulation, not only the anti-interference ability of the remote control technology is improved, but also the reliability of the smart home communication is improved; by setting a plurality of speaker nodes or lamps Realize the music networking function between multiple nodes or lamps to improve people's life experience and enrich the smart home control function.
附图说明DRAWINGS
下面将结合附图及实施例对本发明作进一步说明，附图中：The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:
图1为本发明提供的一种调频接收电路的模块框图；1 is a block diagram of a frequency modulation receiving circuit provided by the present invention;
图2为本发明一实施例提供的调频接收天线、调频接收芯片、接收微处理器及接收频率编码开关的结构示意图；2 is a schematic structural diagram of a frequency modulation receiving antenna, a frequency modulation receiving chip, a receiving microprocessor, and a receiving frequency encoding switch according to an embodiment of the present invention;
图3为本发明一实施例提供的放大器、喇叭及供电装置的结构示意图。FIG. 3 is a schematic structural diagram of an amplifier, a horn, and a power supply device according to an embodiment of the present invention.
具体实施方式detailed description
为了对本发明的技术特征、目的和效果有更加清楚的理解，以下将对照附图详细说明本发明的具体实施方式。应当理解，以下说明仅为本发明实施例的具体阐述，不应以此限制本发明的保护范围。In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the following description is only illustrative of the embodiments of the invention, and is not intended to limit the scope of the invention.
本发明提供一种调频接收电路100、灯具及其音频播放方法，其目的在于，通过调频通信接收外部的音频信号，通过设置不同频点提高遥控技术的抗干扰能力，提高了智能家居通信的可靠性，通过设置多个喇叭6节点或者灯具实现多个节点或灯具之间的音乐组网功能，提高人们的生活体验，丰富了智能家居控制功能。The invention provides an FM receiving circuit 100, a lamp and an audio playing method thereof, the purpose of which is to receive an external audio signal through frequency modulation communication, improve the anti-interference ability of the remote control technology by setting different frequency points, and improve the reliability of the smart home communication. Sexuality, by setting up multiple speakers 6 nodes or lamps to achieve music networking functions between multiple nodes or lamps, improve people's life experience, enrich the smart home control functions.
参见图1，图1为本发明提供的一种调频接收电路100的模块框图，该调频接收电路100包括调频接收天线1、调频接收芯片2、接收微处理器3、接收频率编码开关4、放大器5以及喇叭6。Referring to FIG. 1, FIG. 1 is a block diagram of a frequency modulation receiving circuit 100 according to the present invention. The FM receiving circuit 100 includes an FM receiving antenna 1, a FM receiving chip 2, a receiving microprocessor 3, a receiving frequency encoding switch 4, and an amplifier. 5 and speaker 6.
调频接收天线1用于接收调频信号，其接收的调频范围为88MHz-110MHz。The FM receiving antenna 1 is for receiving a frequency modulated signal, and the frequency range of the receiving is 88 MHz-110 MHz.
调频接收芯片2电性连接于所述调频接收天线1；参见图2，图2为本发明一实施例提供的调频接收天线1、调频接收芯片2、接收微处理器3及接收 频率编码开关4的结构示意图，调频接收芯片2为图2中的U2，其端口FMIN连接至电容C25的一端，电容C25的另一端连接至电容C10的一端、电感L5的一端以及电容C11的一端，电容C10的另一端及电感L5的另一端接地，电容C11的另一端连接至电感L4的一端，电感L4的另一端连接至调频接收天线1。The FM receiving chip 2 is electrically connected to the FM receiving antenna 1; see FIG. 2, FIG. 2 is an FM receiving antenna 1, an FM receiving chip 2, a receiving microprocessor 3, and receiving according to an embodiment of the present invention. Schematic diagram of the frequency encoding switch 4, the FM receiving chip 2 is U2 in FIG. 2, the port FMIN is connected to one end of the capacitor C25, and the other end of the capacitor C25 is connected to one end of the capacitor C10, one end of the inductor L5, and one end of the capacitor C11. The other end of the capacitor C10 and the other end of the inductor L5 are grounded, the other end of the capacitor C11 is connected to one end of the inductor L4, and the other end of the inductor L4 is connected to the FM receiving antenna 1.
接收微处理器3电性连接于所述调频接收芯片2；接收微处理器3为图2中的MCU2，其端口5连接至U2的端口SDA，端口6连接至U2的端口SCLK。The receiving microprocessor 3 is electrically connected to the FM receiving chip 2; the receiving microprocessor 3 is the MCU 2 in FIG. 2, its port 5 is connected to the port SDA of U2, and the port 6 is connected to the port SCLK of U2.
用于调节接收频点的接收频率编码开关4，电性连接于所述接收微处理器3；接收频率编码开关4包括三个相互并联的子开关，以切换所述调频接收天线1的接收频点。这三个子开关分别为子开关A、子开关B及子开关C，子开关A、子开关B及子开关C的一端均接地，子开关A的另一端通过电阻R17连接至MCU2的端口3，子开关B的另一端通过电阻R14连接至MCU2的端口4，子开关C的另一端通过电阻R21连接至MCU2的端口7。The receiving frequency encoding switch 4 for adjusting the receiving frequency point is electrically connected to the receiving microprocessor 3; the receiving frequency encoding switch 4 comprises three sub-switches connected in parallel to switch the receiving frequency of the FM receiving antenna 1 point. The three sub-switches are sub-switch A, sub-switch B and sub-switch C, one end of sub-switch A, sub-switch B and sub-switch C are grounded, and the other end of sub-switch A is connected to port 3 of MCU 2 through resistor R17. The other end of the sub-switch B is connected to the port 4 of the MCU 2 via a resistor R14, and the other end of the sub-switch C is connected to the port 7 of the MCU 2 via a resistor R21.
放大器5电性连接于所述调频接收芯片2；所述放大器5为AB类放大器5，AB类放大器5是依赖于偏置电流的大小和输出电平的A类和B类放大器5的结合器件，AB类放大器5的偏置介于A类放大器5与B类放大器5之间。AB类的效率远远大于A类放大器5而略低于B类放大器5。AB类放大器5的偏置可以使工作于推挽工作方式的两个晶体管的工作区间互有覆盖。同时由于AB类放大器不干扰FM接收频段，非常适合用于此设备。参见图3，图3为本发明一实施例提供的放大器5、喇叭6及供电装置7的结构示意图，放大器5为图3中的U3，其端口4依次通过电阻R36、电容C32、电感L7、电阻R34及电容C28连接至接口101，如图2，接口101通过电阻R33连接至U2的端口ROUT。U3的端口3连接至电阻R20的一端，电阻R20的另一端连接至电容C30的一端并连接至电感L7与电阻R34之间，电容C30的另一端连接至电容C29的一端并连接至电阻R34与电容C28之间，电容C29的另一端连接至接口102，如图2，接口102通过电阻R31连接至U2的端口LOUT。U3的端口2连接至电容C34的一端，C34的另一端连接至电阻R20的一端及电阻R18的一端，电阻R18的另一端连接至电容C13，电容C13的另一端连 接至电感L7与电阻R34之间。The amplifier 5 is electrically connected to the FM receiving chip 2; the amplifier 5 is a class AB amplifier 5, and the class AB amplifier 5 is a combination device of the class A and class B amplifiers 5 depending on the magnitude and output level of the bias current. The bias of the class AB amplifier 5 is between the class A amplifier 5 and the class B amplifier 5. The efficiency of class AB is much greater than that of class A amplifier 5 and slightly lower than class B amplifier 5. The bias of the class AB amplifier 5 allows the working sections of the two transistors operating in the push-pull mode to overlap each other. At the same time, since the class AB amplifier does not interfere with the FM receiving band, it is very suitable for this device. Referring to FIG. 3, FIG. 3 is a schematic structural diagram of an amplifier 5, a horn 6 and a power supply device 7 according to an embodiment of the present invention. The amplifier 5 is U3 in FIG. 3, and the port 4 sequentially passes through a resistor R36, a capacitor C32, and an inductor L7. Resistor R34 and capacitor C28 are connected to interface 101. As shown in Figure 2, interface 101 is coupled via resistor R33 to port ROUT of U2. Port 3 of U3 is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to one end of the capacitor C30 and connected between the inductor L7 and the resistor R34. The other end of the capacitor C30 is connected to one end of the capacitor C29 and connected to the resistor R34. Between the capacitors C28, the other end of the capacitor C29 is connected to the interface 102. As shown in FIG. 2, the interface 102 is connected to the port LOUT of U2 through a resistor R31. Port 2 of U3 is connected to one end of capacitor C34, the other end of C34 is connected to one end of resistor R20 and one end of resistor R18, the other end of resistor R18 is connected to capacitor C13, and the other end of capacitor C13 is connected. Connected between inductor L7 and resistor R34.
喇叭6电性连接于所述放大器5。喇叭6的一端连接至电容C15的一端及电感L2的一端，喇叭6的另一端连接至电容C16的一端及电感L3的一端，电感L2的另一端连接至U3的端口5，电感L3的另一端连接至U3的端口8。The horn 6 is electrically connected to the amplifier 5. One end of the speaker 6 is connected to one end of the capacitor C15 and one end of the inductor L2, the other end of the speaker 6 is connected to one end of the capacitor C16 and one end of the inductor L3, the other end of the inductor L2 is connected to the port 5 of the U3, and the other end of the inductor L3 Connect to port 8 of U3.
优选的，参见图3，该调频接收电路100还包括供电装置7，电性连接于所述放大器5、所述调频接收芯片2及所述接收微处理器3。所述供电装置7包括供电电路71及稳压电路72。Preferably, referring to FIG. 3, the FM receiving circuit 100 further includes a power supply device 7 electrically connected to the amplifier 5, the FM receiving chip 2, and the receiving microprocessor 3. The power supply device 7 includes a power supply circuit 71 and a voltage stabilization circuit 72.
供电电路71用于提供第一电压，电性连接于所述放大器5的端口6；该第一电压优选为+3.6-8V。The power supply circuit 71 is configured to provide a first voltage electrically connected to the port 6 of the amplifier 5; the first voltage is preferably +3.6-8V.
用于接入所述第一电压以输出第二电压的稳压电路72，其输入端连接于所述供电电路71，其输出端电性连接于所述调频接收芯片2及所述接收微处理器3。第二电压优选为3.3V，第二电压接入到MCU2的端口1及U2的端口VDD。a voltage stabilizing circuit 72 for connecting the first voltage to output a second voltage, an input end of which is connected to the power supply circuit 71, an output end of which is electrically connected to the FM receiving chip 2 and the receiving micro processing Device 3. The second voltage is preferably 3.3V, and the second voltage is connected to port 1 of MCU2 and port VDD of U2.
优选的，参见图2，该调频接收电路100还包括接收LED灯RX-LED，接收LED灯RX-LED用于显示调频信号接收状态的接收LED灯，电性连接于所述接收微处理器3。接收LED灯RX-LED的正极通过电阻R16连接至MCU2的端口2。Preferably, referring to FIG. 2, the FM receiving circuit 100 further includes a receiving LED lamp RX-LED, and a receiving LED lamp for receiving the FM signal RX-LED for displaying the FM signal receiving state, and is electrically connected to the receiving microprocessor 3 . The anode of the receiving LED lamp RX-LED is connected to port 2 of the MCU 2 via a resistor R16.
优选的，该调频接收电路100可以应用在灯具中，例如筒灯，通过将安装多个包括该调频接收电路100的筒灯在同一室内的天花板的不同位置，实现室内环绕声的效果。而调频发射器的音频输入有2路：有线输入和无线输入，有线输入通过发射器上的AUX接口，可将电视机、光碟机或其他设备的音频信号接入；无线输入通过蓝牙连接方式，可将蓝牙配对的手机播放的音频信号发射出去，供多个接收单元放音，从而实现灯光与音乐的互动。可以安装在室内离音频较近的地方，如电视机旁，通过设置调频发射器，将电视机的声音通过该调频发射器发送到多个接收单元，多个接收单元可以通过该调频接收电路100同时发声。Preferably, the FM receiving circuit 100 can be applied to a luminaire, such as a downlight, to achieve an indoor surround sound effect by installing a plurality of downlights including the FM receiving circuit 100 at different positions of a ceiling in the same room. The FM transmitter has two audio inputs: wired input and wireless input. The wired input can be connected to the audio signal of the TV, CD player or other device through the AUX interface on the transmitter; the wireless input is connected via Bluetooth. The audio signal played by the Bluetooth paired mobile phone can be transmitted out for playing by multiple receiving units, thereby realizing the interaction between the light and the music. It can be installed indoors from the audio, such as next to the TV set. By setting the FM transmitter, the sound of the TV set is sent to the plurality of receiving units through the FM transmitter, and the plurality of receiving units can pass the FM receiving circuit 100. Sound at the same time.
此外，提供一种灯具的音频播放方法，提供一至多个如上所述的灯具，例如安装多个筒灯，包括步骤S1-S5： In addition, an audio playback method for a luminaire is provided, providing one or more luminaires as described above, such as mounting a plurality of downlights, including steps S1-S5:
S1、通过所述接收微处理器3及所述接收频率编码开关4控制所述调频接收天线1的接收频点；例如每个筒灯均通过所述接收微处理器3及所述接收频率编码开关4控制所述调频接收天线1的接收频点，该步骤S1包括子步骤S11-S12：S1, controlling, by the receiving microprocessor 3 and the receiving frequency encoding switch 4, a receiving frequency point of the FM receiving antenna 1; for example, each downlight is encoded by the receiving microprocessor 3 and the receiving frequency The switch 4 controls the receiving frequency point of the FM receiving antenna 1, and the step S1 includes sub-steps S11-S12:
S11、通过所述接收微处理器3获取所述接收频率编码开关4的三个子开关的状态；参见图2，三个子开关分别为子开关A、子开关B及子开关C，开关闭合时产生信号1，断开时产生信号0，因此三个子开关通过开关组合可以实现八种不同的信号，如下表：S11. Acquire, by the receiving microprocessor 3, a state of three sub-switches of the receiving frequency encoding switch 4; referring to FIG. 2, the three sub-switches are a sub-switch A, a sub-switch B and a sub-switch C respectively, and the switch is closed. Signal 1, when it is off, generates signal 0, so three sub-switches can realize eight different signals through switch combination, as shown in the following table:
  f1F1 f2F2 f3F3 f4F4 f5F5 f6F6 f7F7 f8F8
AA 00 00 00 00 11 11 11 11
BB 00 00 11 11 00 00 11 11
CC 00 11 00 11 00 11 00 11
通过三个子开关的不同组合，可以对应于8种不同的频点。With different combinations of three sub-switches, it can correspond to 8 different frequency points.
S12、依据三个所述子开关的状态确定所述接收频点。例如，f1为88MHz，当子开关A断开、子开关B断开，子开关C闭合时，调频接收天线1的工作频点为f1的88MHz，以此类推。S12. Determine the receiving frequency point according to states of the three sub-switches. For example, f1 is 88 MHz. When sub-switch A is turned off, sub-switch B is turned off, and sub-switch C is closed, the operating frequency of the FM receiving antenna 1 is 88 MHz of f1, and so on.
S2、通过所述调频接收天线1按照所述接收频点接收外部的调频信号；例如，当前调频接收天线1的工作频点为f1的88MHz时，接收外部88MHz频点的调频信号。每个筒灯均通过所述调频接收天线1按照所述接收频点接收外部的调频信号。S2, receiving, by the FM receiving antenna 1, an external frequency modulated signal according to the receiving frequency point; for example, when the operating frequency of the current FM receiving antenna 1 is 88 MHz of f1, receiving an FM signal of an external 88 MHz frequency point. Each of the downlights receives an external frequency modulated signal according to the receiving frequency point through the FM receiving antenna 1.
S3、通过所述调频接收芯片2将所述调频信号转换为音频信号。例如每个筒灯均通过所述调频接收芯片2将所述调频信号转换为音频信号。S3. Convert the FM signal into an audio signal by using the FM receiving chip 2. For example, each of the downlights converts the FM signal into an audio signal through the FM receiving chip 2.
S4、通过所述放大器5对所述音频信号放大。例如每个筒灯均通过所述放大器5对所述音频信号放大。S4, the audio signal is amplified by the amplifier 5. For example, each of the downlights amplifies the audio signal through the amplifier 5.
S5、通过所述喇叭6播放经放大后的音频信号。例如每个筒灯均通过所述喇叭6播放经放大后的音频信号。如此，通过将安装多个包括该调频接收电路100的筒灯在同一室内的天花板的不同位置，即可实现室内环绕声的效果。S5. The amplified audio signal is played by the speaker 6. For example, each of the downlights plays the amplified audio signal through the speaker 6. In this manner, the effect of indoor surround sound can be achieved by installing a plurality of downlights including the FM receiving circuit 100 at different positions of the ceiling in the same room.
优选的，该音频播放方法还包括步骤S6-S7： Preferably, the audio playing method further includes steps S6-S7:
S6、通过第一电压为所述放大器5供电。第一电压优选为+3.6-8V。S6. The amplifier 5 is powered by a first voltage. The first voltage is preferably +3.6-8V.
S7、通过第二电压为所述调频接收芯片2及所述接收微处理器3供电。第二电压优选为+3.3V。由于灯具本身便具有取电接线，因此无需另外加设外接的电线，只需将供电电路71连接至灯具本身的供电线即可。合理利用了灯具本身的资源，节约了成本。S7. The FM receiving chip 2 and the receiving microprocessor 3 are powered by a second voltage. The second voltage is preferably +3.3V. Since the lamp itself has a power take-off wire, it is not necessary to additionally provide an external wire, and it is only necessary to connect the power supply circuit 71 to the power supply line of the lamp itself. Reasonable use of the resources of the lamps themselves, saving costs.
本文提供了实施例的各种操作。在一个实施例中，所述的一个或操作可以构成一个或计算机可读介质上存储的计算机可读指令，其在被电子设备执行时将使得计算设备执行所述操作。描述一些或所有操作的顺序不应当被解释为暗示这些操作必需是顺序相关的。本领域技术人员将理解具有本说明书的益处的可替代的排序。而且，应当理解，不是所有操作必需在本文所提供的每个实施例中存在。Various operations of the embodiments are provided herein. In one embodiment, the one or operations may constitute computer readable instructions stored on one or a computer readable medium that, when executed by an electronic device, cause the computing device to perform the operations. The order in which some or all of the operations are described should not be construed as implying that the operations must be sequential. Those skilled in the art will appreciate alternative rankings that have the benefit of this specification. Moreover, it should be understood that not all operations must be present in every embodiment provided herein.
而且，本文所使用的词语“优选的”意指用作实例、示例或例证。奉文描述为“优选的”任意方面或设计不必被解释为比其他方面或设计更有利。相反，词语“优选的”的使用旨在以具体方式提出概念。如本申请中所使用的术语“或”旨在意指包含的“或”而非排除的“或”。即，除非另外指定或从上下文中清楚，“X使用A或B”意指自然包括排列的任意一个。即，如果X使用A；X使用B；或X使用A和B二者，则“X使用A或B”在前述任一示例中得到满足。Moreover, the word "preferred" as used herein is intended to serve as an example, instance, or illustration. Any aspect or design described as "preferred" by the text is not necessarily to be construed as being more advantageous than other aspects or designs. Instead, the use of the word "preferred" is intended to present a concept in a specific manner. The term "or" as used in this application is intended to mean an "or" or "an" That is, unless otherwise specified or clear from the context, "X employs A or B" means naturally including any one of the permutations. That is, if X uses A; X uses B; or X uses both A and B, then "X uses A or B" is satisfied in any of the foregoing examples.
而且，尽管已经相对于一个或实现方式示出并描述了本公开，但是本领域技术人员基于对本说明书和附图的阅读和理解将会想到等价变型和修改。本公开包括所有这样的修改和变型，并且仅由所附权利要求的范围限制。特别地关于由上述组件(例如元件、资源等)执行的各种功能，用于描述这样的组件的术语旨在对应于执行所述组件的指定功能(例如其在功能上是等价的)的任意组件(除非另外指示)，即使在结构上与执行本文所示的本公开的示范性实现方式中的功能的公开结构不等同。此外，尽管本公开的特定特征已经相对于若干实现方式中的仅一个被公开，但是这种特征可以与如可以对给定或特定应用而言是期望和有利的其他实现方式的一个或其他特征组合。而且，就术语“包括”、“具有”、“含有”或其变形被用在具体实施方式或权 利要求中而言，这样的术语旨在以与术语”包含”相似的方式包括。Rather, the present invention has been shown and described with respect to the embodiments of the invention. The present disclosure includes all such modifications and variations, and is only limited by the scope of the appended claims. With particular regard to various functions performed by the above-described components (e.g., elements, resources, etc.), the terms used to describe such components are intended to correspond to performing the specified functions of the components (e.g., they are functionally equivalent). Any component (unless otherwise indicated) is not equivalent in structure to the disclosed structure for performing the functions in the exemplary implementations of the present disclosure as shown herein. Moreover, although certain features of the present disclosure have been disclosed with respect to only one of several implementations, such features may be combined with one or other features of other implementations as may be desired and advantageous for a given or particular application. combination. Moreover, the terms "including", "having", "containing" or variations thereof are used in the specific embodiments In the interest of the claims, such terms are intended to be encompassed in a similar manner to the term "comprising."
本发明实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。上述提到的存储介质可以是只读存储器，磁盘或光盘等。上述的各装置或***，可以执行相应方法实施例中的方法。Each functional unit in the embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium. The above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like. Each of the above described devices or systems can perform the methods of the corresponding method embodiments.
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。 In the above, the present invention has been disclosed in the above preferred embodiments, but the preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various modifications without departing from the spirit and scope of the invention. The invention is modified and retouched, and the scope of the invention is defined by the scope defined by the claims.

Claims (10)

  1. 一种调频接收电路，其特征在于，包括：An FM receiving circuit, comprising:
    用于接收调频信号的调频接收天线；An FM receiving antenna for receiving a frequency modulated signal;
    调频接收芯片，电性连接于所述调频接收天线；The FM receiving chip is electrically connected to the FM receiving antenna;
    接收微处理器，电性连接于所述调频接收芯片；Receiving a microprocessor electrically connected to the FM receiving chip;
    用于调节接收频点的接收频率编码开关，电性连接于所述接收微处理器；a receiving frequency encoding switch for adjusting a receiving frequency point, electrically connected to the receiving microprocessor;
    放大器，电性连接于所述调频接收芯片；An amplifier electrically connected to the FM receiving chip;
    喇叭，电性连接于所述放大器。A speaker is electrically connected to the amplifier.
  2. 根据权利要求1所述的调频接收电路，其特征在于，还包括：The FM receiving circuit according to claim 1, further comprising:
    供电装置，电性连接于所述放大器、所述调频接收芯片及所述接收微处理器。The power supply device is electrically connected to the amplifier, the FM receiving chip, and the receiving microprocessor.
  3. 根据权利要求2所述的调频接收电路，其特征在于，所述供电装置包括：The FM receiving circuit according to claim 2, wherein the power supply device comprises:
    用于提供第一电压的供电电路，电性连接于所述放大器；a power supply circuit for providing a first voltage, electrically connected to the amplifier;
    用于接入所述第一电压以输出第二电压的稳压电路，其输入端连接于所述供电电路，其输出端电性连接于所述调频接收芯片及所述接收微处理器。And a voltage stabilizing circuit for connecting the first voltage to output a second voltage, wherein an input end is connected to the power supply circuit, and an output end thereof is electrically connected to the FM receiving chip and the receiving microprocessor.
  4. 根据权利要求1所述的调频接收电路，其特征在于，所述接收频率编码开关包括三个相互并联的子开关，以切换所述调频接收天线的接收频点。The FM receiving circuit according to claim 1, wherein said receiving frequency encoding switch comprises three sub-switches connected in parallel to switch a receiving frequency point of said FM receiving antenna.
  5. 根据权利要求1所述的调频接收电路，其特征在于，还包括：The FM receiving circuit according to claim 1, further comprising:
    用于显示调频信号接收状态的接收LED灯，电性连接于所述接收微处理器。A receiving LED for displaying a state of receiving the FM signal is electrically connected to the receiving microprocessor.
  6. 根据权利要求1所述的调频接收电路，其特征在于，所述放大器为AB类放大器。The frequency modulation receiving circuit according to claim 1, wherein said amplifier is a class AB amplifier.
  7. 一种灯具，其特征在于，包括如权利要求1-6任一项所述的调频接收电路。A luminaire characterized by comprising the frequency modulation receiving circuit according to any one of claims 1-6.
  8. 一种灯具的音频播放方法，提供一至多个如权利要求7所述的灯具，其特征在于，包括步骤：A method for playing audio of a luminaire, comprising one or more luminaires according to claim 7, comprising the steps of:
    通过所述接收微处理器及所述接收频率编码开关控制所述调频接收天线 的接收频点；Controlling the FM receiving antenna by the receiving microprocessor and the receiving frequency encoding switch Receiving frequency point;
    通过所述调频接收天线按照所述接收频点接收外部的调频信号；Receiving, by the FM receiving antenna, an external frequency modulated signal according to the receiving frequency point;
    通过所述调频接收芯片将所述调频信号转换为音频信号；Converting the FM signal into an audio signal by the FM receiving chip;
    通过所述放大器对所述音频信号放大；Amplifying the audio signal by the amplifier;
    通过所述喇叭播放经放大后的音频信号。The amplified audio signal is played through the speaker.
  9. 根据权利要求8所述的音频播放方法，其特征在于，所述通过所述接收微处理器及所述接收频率编码开关控制所述调频接收天线的接收频点的步骤包括以下子步骤：The audio playing method according to claim 8, wherein the step of controlling the receiving frequency of the FM receiving antenna by the receiving microprocessor and the receiving frequency encoding switch comprises the following substeps:
    通过所述接收微处理器获取所述接收频率编码开关的三个子开关的状态；Acquiring, by the receiving microprocessor, a state of three sub-switches of the receiving frequency encoding switch;
    依据三个所述子开关的状态确定所述接收频点。The receiving frequency point is determined according to the states of the three sub-switches.
  10. 根据权利要求8所述的音频播放方法，其特征在于，还包括步骤：The audio playing method according to claim 8, further comprising the steps of:
    通过第一电压为所述放大器供电；Powering the amplifier through a first voltage;
    通过第二电压为所述调频接收芯片及所述接收微处理器供电。 The FM receiving chip and the receiving microprocessor are powered by a second voltage.
PCT/CN2017/087147 2016-12-12 2017-06-05 Frequency-modulated receiving circuit, lamp and audio playback method thereof WO2018107672A1 (en)

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