WO2012000231A1 - 一种接收信号的装置、天线装置及移动终端 - Google Patents

一种接收信号的装置、天线装置及移动终端 Download PDF

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Publication number
WO2012000231A1
WO2012000231A1 PCT/CN2010/076677 CN2010076677W WO2012000231A1 WO 2012000231 A1 WO2012000231 A1 WO 2012000231A1 CN 2010076677 W CN2010076677 W CN 2010076677W WO 2012000231 A1 WO2012000231 A1 WO 2012000231A1
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WO
WIPO (PCT)
Prior art keywords
signal
receiving
lead
antenna
mobile terminal
Prior art date
Application number
PCT/CN2010/076677
Other languages
English (en)
French (fr)
Inventor
何文卿
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10853934.7A priority Critical patent/EP2523254B1/en
Priority to US13/522,039 priority patent/US9026073B2/en
Publication of WO2012000231A1 publication Critical patent/WO2012000231A1/zh

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/44Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H01Q1/46Electric supply lines or communication lines

Definitions

  • the present invention relates to a signal receiving technology of a mobile terminal, and in particular, to a device for receiving a signal, an antenna device, and a mobile terminal. Background technique
  • a mobile terminal generally has a receiving function of a frequency modulation (FM) signal.
  • the application number is 20081004083.6, and the invention whose name is a mobile terminal earphone proposes a terminal having an FM signal receiving function, and the FM antenna of the terminal is realized by the earphone, that is, the FM signal is received by the earphone.
  • the disadvantages of this method are: Because the earphone cable is long, and each time you listen to the radio, you need to wear the earphone, which will cause some inconvenience to the user. In addition, the cost of the earphone is high. If the earphone is removed, the terminal using this method will The reception of the FM signal cannot be achieved.
  • the application number is 200920105948.8, and the utility model name is an FM FM antenna and a terminal.
  • the patent application proposes a terminal for receiving signals by using a built-in FM FM antenna, and the FM FM antenna is externally placed, and an internal antenna is specially designed for receiving FM signals.
  • the built-in antenna is wound on two different enameled wires on a fixed plastic board or printed circuit board (PCB, PrintedCircuitBoard).
  • PCB printed circuit board
  • the method solves the problem that the mobile terminal can only listen to the FM radio broadcast by establishing a connection with the wired headset in the prior art, but the internal space occupied by the method is large, and the antenna is produced and the terminal is produced. It is more inconvenient and increases the cost of the FM antenna. Summary of the invention
  • the main object of the present invention is to provide a device for receiving signals and an antenna package.
  • the mobile terminal With the mobile terminal, the occupied space of the receiving antenna of the FM signal can be greatly reduced.
  • the present invention provides an apparatus for receiving a signal, including:
  • the leaded device is: a device in the mobile terminal that is connected to a motherboard of the mobile terminal by a lead.
  • the leaded device is multiplexed into a receiving antenna, and the receiving FM signal is specifically:
  • the present invention provides an antenna device, including: a device with a lead, an antenna matching network, an LNA, and an FM chip;
  • a device with leads for multiplexing into a receiving antenna to receive FM signals A device with leads for multiplexing into a receiving antenna to receive FM signals.
  • An antenna matching network configured to debug the receiving performance of the receiving antenna
  • An LNA configured to increase a signal to noise ratio of the FM signal
  • the FM chip is configured to demodulate the FM signal received by the device with the lead, and send the demodulated audio signal to the speaker.
  • the leaded device is multiplexed into a receiving antenna, and the receiving FM signal is specifically:
  • the antenna matching network performs debugging on the receiving performance of the receiving antenna, specifically: The antenna matching network receives the FM signal sent by the receiving antenna, and performs DC blocking processing on the FM signal; and adjusts the receiving performance of the receiving antenna by adjusting the values of the inductance and the capacitance in the antenna matching network.
  • the LNA increases the signal to noise ratio of the FM signal by specifically:
  • the FM signal is subjected to DC blocking processing by the capacitance of the LNA circuit, and the FM signal after the DC blocking process is amplified by the triode of the LNA circuit; the FM signal amplified by the triode is directly separated by the capacitance of the LNA circuit, and then transported. Give the FM chip.
  • the FM chip demodulates the FM signal received by the device with a lead by:
  • the FM chip detects the received FM signal, filters out the noise in the FM signal, and obtains an audio signal for playback.
  • the present invention provides a mobile terminal, including a display screen, a power supply, a keyboard, a casing, and a main board.
  • the mobile terminal further includes: a device with a lead, an antenna matching network, an LNA, and an FM chip;
  • a device with leads for multiplexing into a receiving antenna to receive FM signals A device with leads for multiplexing into a receiving antenna to receive FM signals.
  • An antenna matching network configured to debug the receiving performance of the receiving antenna
  • An LNA configured to increase a signal to noise ratio of the FM signal
  • the FM chip is configured to demodulate the FM signal received by the device with the lead, and send the demodulated audio signal to the speaker.
  • the mobile terminal further includes:
  • the device for receiving signals, the antenna device and the mobile terminal provided by the invention multiplex the existing leaded device in the mobile terminal into a receiving antenna, and receive the FM signal, thereby minimizing the receiving function of the FM signal.
  • the cost while also greatly saving the idle resources of the mobile terminal.
  • the design of the receiving antenna can be implemented simply and efficiently.
  • a leaded device such as a speaker or a motor can be used as the receiving antenna.
  • the speaker can emit sound and the motor can vibrate, the device with the lead wire is in a good connection state, and the realization of these basic functions is very It is guaranteed, so there is no need to worry about poor contact caused by distortion of the receiving antenna.
  • FIG. 1 is a schematic flow chart of a method for implementing a signal according to the present invention
  • FIG. 2 is a schematic diagram showing the connection between the Speaker and the circuit on the main board of the mobile terminal in the prior art
  • FIG. 3 is a schematic diagram of the circuit of the present invention for improving the circuit of the speaker as a speaker
  • FIG. 4 is a schematic diagram of the receiving circuit of the FM signal of the present invention
  • FIG. 5 is a schematic structural view of the antenna device of the present invention.
  • FIG. 6 is a schematic structural diagram of a mobile terminal of the present invention. detailed description
  • the basic idea of the invention is that the device with leads is multiplexed into a receiving antenna and receives a frequency modulated (FM) signal.
  • FM frequency modulated
  • FIG. 1 is a schematic flow chart of a method for receiving a signal according to the present invention. As shown in FIG. 1, the method for receiving a signal includes the following steps:
  • Step 101 The device with the lead in the mobile terminal is multiplexed into a receiving antenna to receive the FM signal.
  • the existing leaded device in the mobile terminal is multiplexed as a receiving antenna of the FM signal, and is used to receive the FM signal.
  • a device with a lead such as a speaker, a motor, a flexible circuit board for connecting signals of a plurality of circuits, and a light emitting diode. (LED, Light Emitting Diode), etc.; It has been proved by a large number of experiments that it has a great influence on the receiving performance of FM signals.
  • the lead length of the device with leads which is directly related to the receiving efficiency of the receiving antenna to the FM signal, thereby affecting the receiving performance of the FM signal.
  • the length of the lead is generally greater than 30 mm, and the receiving antenna for the FM signal The performance after commissioning is acceptable. If the length of the lead wire reaches 60 mm, the performance of the receiving antenna for the FM signal is better after debugging.
  • FIG. 2 is in the prior art.
  • the connection method generally has two methods of welding and crimping, wherein the welding method is more reliable.
  • the Speaker is used as an example to illustrate how to use the Speaker as the receiving antenna to receive the FM signal; in the Speaker as the speaker.
  • a lead is pulled from the Spk+ or Spk-, and finally the lead is connected to the base (b) of the Low Noise Amplifier (LNA), that is, the Speaker is multiplexed, and the Speaker is used as the mobile terminal.
  • LNA Low Noise Amplifier
  • the speaker together with the lead as the receiving antenna of the FM signal of the mobile terminal; when the speaker and the lead are used as the receiving antenna of the FM signal, the lead connected to the LNA on the Spk+ or Spk- has a wire, so the Speaker and its lead can receive the FM
  • the FM signal flows from the Spk+ or Spk- into the antenna matching network; in addition, the core coil in the Speaker can further enhance the reception of the FM signal.
  • the Speaker is multiplexed, the impedance of the speaker as the speaker circuit and the impedance of the Speaker and the lead antenna as the receiving antenna of the FM signal are very close in the FM signal band, causing the Speaker as the speaker circuit to perform the FM signal received by the receiving antenna.
  • the shunting causes a large attenuation of the FM signal entering the FM signal receiving circuit and reduces the receiving effect of the FM signal; therefore, it is necessary to improve the circuit of the Speaker as a speaker, namely: adding two magnetic beads on the basis of FIG. 2 to prevent FM The signal enters the Speaker as the circuit of the speaker, preventing entry A large attenuation of the FM signal of the FM signal receiving circuit; FIG.
  • FIG. 3 is a schematic diagram of the circuit of the present invention for improving the circuit of the speaker as a speaker.
  • a magnetic bead R1 is added between the inductor L3 and the Spk+, and the inductor L4 is added.
  • Adding magnetic beads R2 to Spk-; the magnetic beads are different from the resistance.
  • the magnetic beads have almost no resistance under DC conditions, and only exhibit high impedance at high frequencies, and the resistance varies with frequency.
  • the resistance has the same resistance value whether it is DC or high frequency; in practical applications, it is preferable to use the magnetic bead at a DC voltage of 0.5 ohm or less and at a high frequency (for example, 100 MHz). ) Magnetic beads with impedances above 1500 ohms.
  • Step 102 debug receiving performance of the receiving antenna.
  • the antenna matching network needs to debug the receiving performance of the receiving antenna.
  • debugging There are two methods for debugging: The first is to connect an inductor in series, and simultaneously connect an inductor in parallel. The inductor is grounded; the second is to connect an inductor in series, and a capacitor is connected in parallel, and the capacitor is grounded. By changing the values of the capacitor and the inductor, the playback effect of the FM signal is auditioned and verified to achieve the receiving performance of the receiving antenna.
  • FIG. 4 is a schematic diagram of a receiving circuit of the FM signal of the present invention, including: a circuit for debugging the receiving performance of the receiving antenna and a circuit for increasing the signal-to-noise ratio of the FM signal received by the antenna; as shown in FIG.
  • the first one is the debugging method.
  • the antenna matching network receives the FM signal received by the Speaker as the receiving antenna. Because the FM signal has a DC component, if the DC blocking is not processed, the DC component will cause a short circuit to the ground. Burn out the Speaker, so the capacitor C7 in the antenna matching network circuit is in the FM signal.
  • the line is directly processed; the FM signal passes through the capacitor C7 and reaches the inductor L5, and then reaches the inductor L6 and the capacitor C8 respectively; the receiving performance of the receiving antenna is debugged by adjusting the values of the inductor L5 and the inductor L6.
  • Step 103 Increase a signal to noise ratio of the FM signal received by the antenna.
  • the FM signal can be further debugged by using the LNA circuit, that is, the FM signal received by the antenna is amplified to improve the signal-to-noise ratio of the FM signal; as shown in FIG. 4, the FM signal Reach capacitor C8, capacitor C8 through inductor
  • the FM signal of L5 is subjected to DC blocking to prevent the bias voltage of the base (b) of the transistor VT5 from being short-circuited to the ground; the FM signal after the DC-separated processing of the capacitor C8 reaches the transistor VT5, and the triode VT5 will be the FM signal.
  • the FM signal amplified by the transistor VT5 flows from the collector (c) of the transistor VT5 to the capacitor C12, and the capacitor C12 separates the FM signal and then delivers it to the FM chip;
  • the resistor R4 and the resistor R5 are DC bias resistors of the triode VT5 amplifying circuit, and the capacitor C9 is a bypass capacitor;
  • the inductor L7, the capacitor C10, and the capacitor C11 are respectively a choke inductor and a filter capacitor for supplying power to the LNA circuit.
  • Step 104 Demodulate the FM signal, and send the demodulated audio signal to the Speaker for playing;
  • the FM signal finally flows into the FM chip through the FM signal input pin of the FM chip.
  • the FM chip is required to solve the FM signal. Adjust, that is, the FM chip detects the received FM signal, filters out the noise part of the FM signal, and obtains the audio signal for playing from the FM signal; the audio output positive pin of the FM chip is connected with the Spk+ of the speaker, FM The audio output negative pin of the chip is connected to the Spk- of the speaker, and the FM chip sends the audio signal to the Speaker through the audio output positive pin and the audio output negative pin;
  • the FM chip in this embodiment can exist independently or integrate with other chips.
  • the FM chip can be integrated with the baseband processing chip of the mobile terminal, integrated with the WiFi chip, integrated with the Bluetooth chip, and the FM chip and the WiFi chip can also be used.
  • the Bluetooth chip are integrated.
  • the present invention also provides an apparatus for receiving a signal, the apparatus comprising: a device with a lead for multiplexing into a receiving antenna, and receiving a frequency modulated (FM) signal.
  • the device with a lead is: a device in the mobile terminal that is connected to a motherboard of the mobile terminal by a lead.
  • the leaded device is multiplexed into a receiving antenna, and the FM signal is received by: pulling a lead from a device with a lead in the mobile terminal, and the lead is connected to a base of a low noise amplifier (LNA)
  • LNA low noise amplifier
  • the device with the lead is used as the receiving antenna of the FM signal, receives the FM signal and transmits the received FM signal to the antenna matching network.
  • FIG. 5 is a schematic structural diagram of the antenna device of the present invention. As shown in FIG. 5, the antenna device includes: a device 51 with a lead, an antenna matching network 52, an LNA 53 and an FM chip 54;
  • An antenna matching network 52 configured to debug receiving performance of the receiving antenna
  • LNA53 configured to increase a signal to noise ratio of the FM signal
  • the FM chip 54 is configured to demodulate the FM signal, and send the demodulated audio signal to the speaker;
  • the device 51 with the lead in the antenna device is multiplexed into a receiving antenna, and the FM signal is received as follows:
  • the lead is pulled out from the existing device 51 with the lead in the mobile terminal, and the lead is connected to the base of the LNA 53.
  • the leaded device 51 acts as a receiving antenna for the FM signal, receives the FM signal and transmits the FM signal to the antenna matching network 52;
  • the leaded device is: the mobile terminal is connected to the motherboard of the mobile terminal through a lead device.
  • the antenna matching network 52 debugs the receiving performance of the receiving antenna: the antenna matching network 52 receives the FM signal received by the receiving antenna, and the capacitor in the antenna matching network circuit performs DC blocking processing on the FM signal, and adjusts the inductance and the capacitance. Value, debug the receiving performance of the receiving antenna.
  • the LNA 53 increases the signal-to-noise ratio of the FM signal by: performing a DC blocking process on the FM signal by using a capacitor, and amplifying the FM signal after being subjected to a capacitance isolation process by using a triode; and isolating the FM signal amplified by the triode by using a capacitor Straight processing is then delivered to the FM chip 54.
  • the FM chip 54 demodulates the FM signal into: The FM chip 54 detects the received FM signal, filters out noise in the FM signal, and obtains an audio signal for playback.
  • FIG. 6 is a schematic diagram showing the structure of the mobile terminal of the present invention.
  • the mobile terminal further includes: a device 61 with a lead, an antenna matching network 62, an LNA 63, and an FM chip 64;
  • a leaded device 61 for multiplexing into a receiving antenna and receiving an FM signal is provided.
  • An antenna matching network 62 configured to debug the receiving performance of the receiving antenna
  • LNA63 configured to increase a signal to noise ratio of the FM signal
  • the FM chip 64 is configured to demodulate the FM signal received by the leaded device 61, and send the demodulated audio signal to the speaker;
  • the mobile terminal further includes: a speaker 65 for playing the received audio signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Details Of Aerials (AREA)

Abstract

本发明公开一种接收信号的装置,包括:带引线的设备,用于复用为接收天线,接收频率调制(FM)信号;本发明还公开一种天线装置及移动终端。根据本发明的技术方案,大大减少FM信号的接收天线的占用空间。

Description

一种接收信号的装置、 天线装置及移动终端 技术领域
本发明涉及移动终端的信号接收技术, 尤其涉及一种接收信号的装置、 天线装置及移动终端。 背景技术
现有技术中,移动终端普遍具有频率调制(FM, Frequency Modulation ) 信号的接收功能。 申请号为 20081004083.6, 发明名称为一种移动终端耳机 的专利申请中提出一种具有 FM信号接收功能的终端,该终端的 FM天线是 通过耳机实现的, 即利用耳机接收 FM信号。 这种方法的缺点是: 由于耳 机线较长, 且每次听收音机都需要佩戴耳机, 因此会给用户造成一定的不 便; 此外, 耳机的成本较高, 如果去掉耳机, 利用此方法的终端就无法实 现 FM信号的接收。
申请号为 200920105948.8, 实用新型名称为 FM调频天线和终端的专 利申请中提出一种利用内置的 FM调频天线接收信号的终端,将 FM调频天 线外放, 为 FM信号的接收专门设计一个内置天线, 该内置天线将两种不 同的漆包线缠绕在固定的塑料板、或印制电路板( PCB, PrintedCircuitBoard ) 上实现。 这种方法解决了现有技术中移动终端只能通过与有线耳机建立连 接的方法收听 FM调频广播的问题, 但是, 这种方法占用的终端内部空间 较大, 且该天线的制作和终端的制作实现起来较为不便, 增加了 FM 天线 的成本。 发明内容
有鉴于此, 本发明的主要目的在于提供一种接收信号的装置、 天线装 置及移动终端, 能大大减少 FM信号的接收天线的占用空间。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供一种接收信号的装置, 包括:
带引线的设备, 用于复用为接收天线, 接收频率调制 (FM )信号。 上述装置中, 所述带引线的设备为: 移动终端中通过引线与移动终端 的主板连接的设备。
上述装置中, 所述带引线的设备复用为接收天线, 接收 FM信号具体 为:
从移动终端中带引线的设备上拉出引线, 将所述引线与低噪声放大器 ( LNA )的基极相连, 将带引线的设备作为 FM信号的接收天线, 接收 FM 信号并将所接收的 FM信号传输给天线匹配网络。
本发明提供一种天线装置, 包括:带引线的设备、天线匹配网络、 LNA、 FM芯片; 其中,
带引线的设备, 用于复用为接收天线, 接收 FM信号。
天线匹配网络, 用于对所述接收天线的接收性能进行调试;
LNA, 用于增加所述 FM信号的信噪比;
FM芯片, 用于对带引线的设备接收的 FM信号进行解调, 并将解调后 得到的音频信号发送给扬声器。
上述装置中, 所述带引线的设备复用为接收天线, 接收 FM信号具体 为:
从移动终端中带引线的设备上拉出引线, 将所述引线与 LNA的基极相 连,将带引线的设备作为 FM信号的接收天线,接收 FM信号并将所接收的 FM信号传输给天线匹配网络。
上述装置中, 所述天线匹配网络对所述接收天线的接收性能进行调试 具体为: 天线匹配网络收到接收天线发来的 FM信号,对 FM信号进行隔直处理; 并通过调节天线匹配网络中电感和电容的值对接收天线的接收性能进行调 试。
上述装置中 , 所述 LNA增加所述 FM信号的信噪比具体为:
利用 LNA电路的电容对经过 FM信号进行隔直处理, 利用 LNA电路 的三极管将经过电容隔直处理后的 FM信号放大; 利用 LNA电路的电容对 经过三极管放大的 FM信号进行隔直处理, 然后输送给 FM芯片。
上述装置中,所述 FM芯片对带引线的设备接收的 FM信号进行解调具 体为:
FM芯片对收到的 FM信号进行检波, 滤掉 FM信号中的噪声, 得到用 于播放的音频信号。
本发明提供一种移动终端, 包括显示屏、 电源、 键盘、 外壳、 主板, 所述移动终端还包括: 带引线的设备、 天线匹配网络、 LNA、 FM芯片; 其 中,
带引线的设备, 用于复用为接收天线, 接收 FM信号。
天线匹配网络, 用于对所述接收天线的接收性能进行调试;
LNA, 用于增加所述 FM信号的信噪比;
FM芯片, 用于对带引线的设备接收的 FM信号进行解调, 并将解调后 得到的音频信号发送给扬声器。
上述移动终端中, 该移动终端进一步包括:
扬声器, 用于播放收到的音频信号。
本发明提供的接收信号的装置、 天线装置及移动终端, 将移动终端中 已有的带引线的设备复用为接收天线, 接收 FM信号, 可以最大程度的降 低 FM信号的接收功能所带来的成本, 同时还大大节省了移动终端的空闲 资源。 并且, 在移动终端上完全没有空间放置 FM信号的接收天线时, 仍 然可以简单、 高效地实现接收天线外放的设计。
此外, 本发明实施例中可利用扬声器或者马达等带引线的设备作为接 收天线, 只要扬声器能够发出声音, 马达可以震动, 就说明带引线的设备 处于良好的连接状态, 由于这些基本功能的实现很有保障, 所以不需要担 心接收天线扭曲等情况造成的接触不良。 附图说明
图 1 是本发明实现接收信号的方法的流程示意图;
图 2是现有技术中 Speaker与移动终端的主板上电路相连的示意图; 图 3是本发明对 Speaker作为扬声器的电路进行改进后的电路示意图; 图 4是本发明 FM信号的接收电路的示意图;
图 5是本发明天线装置的组成结构示意图;
图 6是本发明移动终端的组成结构示意图。 具体实施方式
本发明的基本思想是: 带引线的设备复用为接收天线, 接收频率调制 ( FM )信号。
下面通过附图及具体实施例对本发明再做进一步的详细说明。
图 1是本发明实现接收信号的方法的流程示意图, 如图 1所示, 该接 收信号的方法包括以下步骤:
步骤 101 ,将移动终端中带引线的设备复用为接收天线,接收 FM信号; 具体的, 将移动终端中已有的带引线的设备复用, 作为 FM信号的接 收天线, 用于接收 FM信号; 这里, 只要是移动终端中通过引线与移动终 端的主板连接的设备都可以称为带引线的设备, 例如扬声器(Speaker ), 马 达、 用于连接多个电路的信号的柔性电路板、 发光二极管 (LED , Light Emitting Diode )等等; 经大量实验证明, 对 FM信号的接收性能影响较大 的是带引线的设备的引线长度, 此长度直接关系接收天线对 FM信号的接 收效率, 从而影响 FM信号的接收性能, 在实际应用中, 一般引线的长度 大于 30毫米, 对 FM信号的接收天线调试后的性能就可以接受, 如果引线 的长度达到 60毫米, 对 FM信号的接收天线调试后的性能就更好。
现有技术中, 移动终端的 Speaker只用于播放音频, 图 2是现有技术中
Speaker与移动终端的主板上电路相连的示意图, 如图 2所示, Speaker的 两条引线分别与移动终端的主板上有关音频放音的正输入端 (Spk+ )和负 输入端(Spk- )相连, 连接方式一般有焊接和压接两种方式, 其中利用焊接 方式更加可靠。
根据天线接收信号的原理, 只要是能够激发出感应电流的金属都可以 充当天线, 例如金属片或者金属丝等; 现以 Speaker 为例说明, 如何利用 Speaker作为接收天线接收 FM信号; 在 Speaker作为扬声器的基础上, 从 Spk+或者 Spk-上拉出一根引线, 最终将引线与低噪声放大器(LNA, Low Noise Amplifier ) 的基极( b )相连, 即实现将 Speaker复用, Speaker既作 为移动终端的扬声器, 又与引线一起作为移动终端的 FM信号的接收天线; Speaker与引线作为 FM信号的接收天线时, Spk+或者 Spk-上与 LNA连接 的引线具有金属丝, 所以 Speaker及其引线可以接收 FM信号, FM信号从 Spk+或者 Spk-流进天线匹配网络; 此外 Speaker中的磁芯线圈可以进一步 加强 FM信号的接收效果。
因为对 Speaker复用, Speaker作为扬声器的电路的阻抗和 Speaker与 引线作为 FM信号的接收天线的阻抗,在 FM信号频段内十分接近,从而导 致 Speaker作为扬声器的电路会对接收天线接收的 FM信号进行分流,造成 进入 FM信号接收电路的 FM信号的巨大衰减, 降低 FM信号的接收效果; 因此, 需要对 Speaker作为扬声器的电路进行改进, 即: 在图 2的基础上增 加两个磁珠, 防止 FM信号进入 Speaker作为扬声器的电路, 从而防止进入 FM信号接收电路的 FM信号的巨大衰减; 图 3是本发明对 Speaker作为扬 声器的电路进行改进后的电路示意图, 如图 3所示, 在电感 L3与 Spk+之 间增加磁珠 R1 , 在电感 L4与 Spk-之间增加磁珠 R2; 磁珠与电阻不同, 磁 珠在直流情况下几乎没有电阻, 只有在高频时才呈现高的阻抗, 其阻值大 小是随着频率的变化而变化的, 而电阻无论是直流还是高频时都是具有一 样的电阻值; 在实际应用中, 较佳的, 使用的磁珠是在直流情况时阻抗在 0.5欧姆以下, 且在高频时(例如 100MHz ) 阻抗在 1500欧姆以上的磁珠。
步骤 102, 对接收天线的接收性能进行调试;
具体的, 为了让接收天线的接收性能达到最优, 天线匹配网络需要对 接收天线的接收性能进行调试, 调试的方法有两种: 第一种是串联一个电 感, 同时并联一个电感, 将该并联的电感接地; 第二种是串联一个电感, 同时并联一个电容, 将该电容接地; 通过改变电容和电感的值, 对 FM信 号的放音效果进行试听和验证, 以实现对接收天线的接收性能进行调试; 图 4是本发明 FM信号的接收电路的示意图, 包括: 对接收天线的接 收性能进行调试的电路和增加天线接收的 FM信号的信噪比的电路的示意 图; 如图 4所示, 釆用的是调试方法的第一种, 天线匹配网络收到 Speaker 作为接收天线接收到的 FM信号, 因为 FM信号是有直流分量的,如果不进 行隔直处理会因为直流分量导致短路对地从而烧坏 Speaker, 所以天线匹配 网络电路中的电容 C7对 FM信号进行隔直处理; FM信号经过电容 C7后 到达电感 L5 , 然后分别到达电感 L6和电容 C8; 通过调节电感 L5和电感 L6的值对接收天线的接收性能进行调试。
步骤 103 , 增加天线接收的 FM信号的信噪比;
具体的, 为了进一步提高 FM信号的质量, 可以利用 LNA电路对 FM 信号进行进一步调试, 即: 对天线接收的 FM信号进行放大, 从而提高 FM 信号的信噪比; 如图 4所示, FM信号到达电容 C8, 电容 C8对经过电感 L5的 FM信号进行隔直处理, 用于防止三极管 VT5的基极(b ) 的偏置电 压不会对地而短路; 经过电容 C8隔直处理后的 FM信号到达三极管 VT5 , 三极管 VT5将 FM信号放大, 从而提高了 FM信号的信噪比; 经过三极管 VT5放大的 FM信号从三极管 VT5的集电极( c )流向电容 C12, 电容 C12 对 FM信号进行隔直处理, 然后输送给 FM芯片; 电阻 R3、 电阻 R4和电 阻 R5是三极管 VT5放大电路的直流偏置电阻, 电容 C9是旁路电容; 电感 L7、 电容 C10、 电容 C11分别是对 LNA电路供电的扼流电感和滤波电容。
步骤 104 , 对 FM 信号进行解调, 将解调后得到的音频信号发送给 Speaker进行播放;
具体的, 如图 4所示, FM信号最后通过 FM芯片的 FM信号输入管脚 流进 FM芯片, 由于经过放大处理的 FM信号有可能其中的噪声比例较高 , 所以需要 FM芯片对 FM信号解调 ,即 FM芯片对收到的 FM信号进行检波, 滤掉 FM信号中的噪声部分, 从 FM信号中得到用于播放的音频信号; FM 芯片的音频输出正管脚与扬声器的 Spk+相连, FM芯片的音频输出负管脚 与扬声器的 Spk-相连, FM芯片通过音频输出正管脚与音频输出负管脚将音 频信号发送给 Speaker进行播放;
本实施例中的 FM 芯片既可以独立存在, 也可以与其他芯片集成, 例 如 FM芯片可以与移动终端的基带处理芯片集成, 与 WiFi芯片集成, 与蓝 牙芯片集成, 也可以将 FM芯片、 WiFi芯片和蓝牙芯片都集成到一起。
为实现上述方法, 本发明还提供一种接收信号的装置, 该装置包括: 带引线的设备, 用于复用为接收天线, 接收频率调制 (FM )信号。 所述带引线的设备为: 移动终端中通过引线与移动终端的主板连接的 设备。
所述带引线的设备复用为接收天线, 接收 FM信号为: 从移动终端中 带引线的设备上拉出引线, 将所述引线与低噪声放大器 (LNA ) 的基极相 连,将带引线的设备作为 FM信号的接收天线,接收 FM信号并将所接收的 FM信号传输给天线匹配网络。
本发明还提供一种天线装置, 图 5是本发明天线装置的组成结构示意 图, 如图 5所示, 该天线装置包括: 带引线的设备 51、 天线匹配网络 52、 LNA53、 FM芯片 54; 其中
带引线的设备 51 , 用于复用为接收天线, 接收 FM信号;
天线匹配网络 52, 用于对接收天线的接收性能进行调试;
LNA53 , 用于增加所述 FM信号的信噪比;
FM芯片 54,用于对所述 FM信号进行解调,并将解调后得到的音频信 号发送给扬声器;
这里, 所述将天线装置中带引线的设备 51复用为接收天线, 接收 FM 信号为: 从移动终端中已有的带引线的设备上 51拉出引线, 将所述引线与 LNA53的基极相连, 带引线的设备 51作为 FM信号的接收天线, 接收 FM 信号并将所述 FM信号传输给天线匹配网络 52; 所述带引线的设备是: 移 动终端中通过引线与移动终端的主板连接的设备。
天线匹配网络 52对接收天线的接收性能进行调试为:天线匹配网络 52 收到接收天线接收到的 FM信号,天线匹配网络电路中的电容对 FM信号进 行隔直处理, 并通过调节电感和电容的值, 对接收天线的接收性能进行调 试。
所述 LNA53增加所述 FM信号的信噪比为: 利用电容对经过 FM信号 进行隔直处理, 利用三极管将经过电容隔直处理后的 FM信号放大; 利用 电容对经过三极管放大的 FM信号进行隔直处理, 然后输送给 FM芯片 54。
FM芯片 54对所述 FM信号进行解调为: FM芯片 54对收到的 FM信 号进行检波, 滤掉 FM信号中的噪声, 得到用于播放的音频信号。
本发明还提供一种移动终端, 该移动终端包括显示屏、 电源、 键盘、 外壳、 主板, 图 6是本发明移动终端的组成结构示意图, 如图 6所示, 该 移动终端还包括: 带引线的设备 61、 天线匹配网络 62、 LNA63、 FM芯片 64; 其中,
带引线的设备 61 , 用于复用为接收天线, 接收 FM信号。
天线匹配网络 62, 用于对所述接收天线的接收性能进行调试;
LNA63 , 用于增加所述 FM信号的信噪比;
FM芯片 64, 用于对带引线的设备 61接收的 FM信号进行解调, 并将 解调后得到的音频信号发送给扬声器;
该移动终端进一步包括: 扬声器 65 , 用于播放收到的音频信号。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围, 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种接收信号的装置, 其特征在于, 该装置包括:
带引线的设备, 用于复用为接收天线, 接收频率调制 (FM )信号。
2、 根据权利要求 1所述的装置, 其特征在于, 所述带引线的设备为: 移动终端中通过引线与移动终端的主板连接的设备。
3、 根据权利要求 1所述的装置, 其特征在于, 所述带引线的设备复用 为接收天线, 接收 FM信号具体为:
从移动终端中带引线的设备上拉出引线, 将所述引线与低噪声放大器 ( LNA )的基极相连, 将带引线的设备作为 FM信号的接收天线, 接收 FM 信号并将所接收的 FM信号传输给天线匹配网络。
4、 一种天线装置, 其特征在于, 该天线装置包括: 带引线的设备、 天 线匹配网络、 LNA、 FM芯片; 其中,
带引线的设备, 用于复用为接收天线, 接收 FM信号。
天线匹配网络, 用于对所述接收天线的接收性能进行调试;
LNA, 用于增加所述 FM信号的信噪比;
FM芯片, 用于对带引线的设备接收的 FM信号进行解调, 并将解调后 得到的音频信号发送给扬声器。
5、 根据权利要求 4所述的装置, 其特征在于, 所述带引线的设备复用 为接收天线, 接收 FM信号为:
从移动终端中带引线的设备上拉出引线, 将所述引线与 LNA的基极相 连,将带引线的设备作为 FM信号的接收天线,接收 FM信号并将所接收的 FM信号传输给天线匹配网络。
6、 根据权利要求 4所述的装置, 其特征在于, 所述天线匹配网络对所 述接收天线的接收性能进行调试为:
天线匹配网络收到接收天线发来的 FM信号,对 FM信号进行隔直处理; 并通过调节天线匹配网络中电感和电容的值对接收天线的接收性能进行调 试。
7、 根据权利要求 4所述的装置, 其特征在于, 所述 LNA增加所述 FM 信号的信噪比为:
利用 LNA电路的电容对经过 FM信号进行隔直处理, 利用 LNA电路 的三极管将经过电容隔直处理后的 FM信号放大; 利用 LNA电路的电容对 经过三极管放大的 FM信号进行隔直处理, 然后输送给 FM芯片。
8、 根据权利要求 4所述的装置, 其特征在于, 所述 FM芯片对带引线 的设备接收的 FM信号进行解调为:
FM芯片对收到的 FM信号进行检波, 滤掉 FM信号中的噪声, 得到用 于播放的音频信号。
9、 一种移动终端, 该移动终端包括显示屏、 电源、 键盘、 外壳、 主板, 其特征在于, 所述移动终端还包括: 带引线的设备、 天线匹配网络、 LNA、 FM芯片; 其中,
带引线的设备, 用于复用为接收天线, 接收 FM信号。
天线匹配网络, 用于对所述接收天线的接收性能进行调试;
LNA, 用于增加所述 FM信号的信噪比;
FM芯片, 用于对带引线的设备接收的 FM信号进行解调, 并将解调后 得到的音频信号发送给扬声器。
10、 根据权利要求 9所述的移动终端, 其特征在于, 该移动终端进一 步包括:
扬声器, 用于播放收到的音频信号。
PCT/CN2010/076677 2010-07-01 2010-09-07 一种接收信号的装置、天线装置及移动终端 WO2012000231A1 (zh)

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