WO2017206310A1

WO2017206310A1 - Method and device for adjusting lcd signal

Info

Publication number: WO2017206310A1
Application number: PCT/CN2016/092748
Authority: WO
Inventors: 冯璐
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-05-30
Filing date: 2016-08-01
Publication date: 2017-12-07
Also published as: CN107453837A

Abstract

A method and device for adjusting an LCD signal. The method comprises: acquiring a communication frequency band adopted in a radio frequency network accessed by a terminal; computing, according to the communication frequency band, a first operating clock frequency, wherein any harmonic component of the first operating clock frequency is located outside the communication frequency band; and adjusting, to the first operating clock frequency, an operating clock frequency of an LCD signal of the terminal.

Description

LCD signal adjustment method and device

Technical field

This document relates to, but is not limited to, the field of signal processing, and more particularly to an adjustment method and apparatus for an LCD signal.

Background technique

With the continuous development of communication technologies, more and more frequency bands of each network standard, Global System for Mobile Communication (GSM) or Code Division Multiple Access (CDMA) or Wideband Codes Multiple networks such as Wideband Code Division Multiple Access (WCDMA) or Long Term Evolution (LTE), and more and more networks and frequency bands supported by mobile terminals. The more susceptible the mobile phone signal is to interference, such as motors, cameras, and liquid crystal displays (LCDs), which may interfere with RF reception performance.

For the mutual interference between the LCD and the RF signal, the external interference of the LCD clock signal is eliminated. The solution in the related art is to add a common mode filter. When the differential clock current flows through the common mode inductor, the current is wound in the same phase. In the middle, the reverse magnetic field is generated to cancel each other, and the electromagnetic interference (Electromagnetic Interference, EMI for short) noise is eliminated, and the inductance itself has a filtering effect on the high frequency harmonics.

However, for different frequency bands, the fixed common mode filter set in the related art cannot effectively avoid the interference of the LCD on the mobile phone radio frequency.

In view of the above problems in the related art, no effective solution has been found yet.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a method and a device for adjusting an LCD signal, which can automatically adjust an LCD signal, thereby reducing interference on a terminal radio frequency signal.

According to an embodiment of the present invention, there is provided a method for adjusting an LCD signal, comprising: acquiring a communication frequency band in which a current radio frequency network of a terminal is located; calculating a first working clock frequency according to the communication frequency band, wherein the first working clock Any harmonic component of the frequency is outside the communication band; Adjusting an operating clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency.

Optionally, the method further includes: determining, before the communication frequency band where the current radio frequency network of the terminal is located, whether the current radio frequency network of the terminal changes; and determining, when the determination result is yes, obtaining the communication frequency band where the current radio frequency network of the terminal is located. .

Optionally, when the LCD signal is a periodic signal, the first working clock frequency f(t) is calculated by the following formula:

Wherein a ₀ is a DC component of the LCD signal decomposed by Fourier transform, n is a harmonic order of the LCD signal, n is a positive integer, ω is an angular velocity, and a _n is a cosine wave The amplitude of the component, b _n is the amplitude of the nth sine wave component.

Optionally, obtaining the communication frequency band in which the current radio frequency network of the terminal is located includes: querying a network type to which the radio frequency network belongs; and determining a communication frequency band corresponding to the network type according to the preset frequency band allocation table.

Optionally, adjusting the working clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency comprises: adjusting the LCD by adjusting a frequency multiplication and frequency dividing parameter of the internal phase locked loop of the terminal The frequency of the signal is adjusted to the first operating clock frequency.

According to another embodiment of the present invention, an apparatus for adjusting an LCD signal includes: an acquisition module configured to acquire a communication frequency band in which a current radio frequency network of a terminal is located; and a calculation module configured to calculate a first according to the communication frequency band An operating clock frequency, wherein any harmonic component of the first operating clock frequency is outside the communication frequency band; and an adjustment module configured to adjust an operating clock frequency of the liquid crystal display LCD signal of the terminal to the first Working clock frequency.

Optionally, the device further includes: a determining module, configured to determine, before the acquiring module acquires a communication frequency band in which the current radio frequency network of the terminal is located, whether the current radio frequency network of the terminal changes; the acquiring module is configured to be When the determination result is yes, it is determined that the communication frequency band in which the current radio network of the terminal is located is obtained.

Optionally, the calculating module is configured to: when the LCD signal is a periodic signal, pass The first working clock frequency f(t) is calculated by the following formula:

Optionally, the obtaining module includes: a query unit, configured to query a network type to which the radio frequency network belongs; and a determining unit configured to determine a communication frequency band corresponding to the network type according to the preset frequency band allocation table.

Optionally, the adjustment module includes: an adjustment unit configured to adjust a frequency of the LCD signal to the first working clock frequency by adjusting a frequency multiplication and frequency division parameter of an internal phase locked loop of the terminal.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

Obtaining the communication frequency band where the current radio network of the terminal is located;

Calculating a first working clock frequency according to the communication frequency band, wherein any harmonic component of the first working clock frequency is located outside the communication frequency band;

Adjusting an operating clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency.

Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions for performing any of the methods described above.

According to the embodiment of the present invention, the communication frequency band in which the current radio frequency network of the terminal is located is obtained, and then the first working clock frequency is calculated according to the communication frequency band, wherein any harmonic component of the first working clock frequency is located in the communication frequency band. In addition, finally, the working clock frequency of the liquid crystal display LCD signal of the terminal is adjusted to the first working clock frequency, and the clock harmonic frequency of the LCD signal is automatically adjusted by automatically adjusting the LCD clock frequency according to the current communication frequency of the terminal. Outside the working frequency band, the interference of the LCD to the terminal signal is effectively avoided, and the situation that the terminal RF signal is constantly changing can be applied, and the problem that the interference of the LCD signal to the terminal RF signal cannot be automatically adjusted in the related art is solved.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a block diagram showing the hardware structure of a mobile terminal for adjusting an LCD signal according to an embodiment of the present invention;

2 is a flowchart of a method for adjusting an LCD signal according to an embodiment of the present invention;

3 is a structural block diagram of an apparatus for adjusting an LCD signal according to an embodiment of the present invention;

4 is a block diagram 1 of an optional structure of an LCD signal adjusting apparatus according to an embodiment of the present invention;

5 is a block diagram 2 of an optional structure of an LCD signal adjusting apparatus according to an embodiment of the present invention;

6 is a schematic diagram of a workflow of an embodiment of the present invention;

Fig. 7 is a schematic diagram showing the waveforms of fundamental waves and harmonics according to an embodiment of the present invention.

Embodiments of the invention

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

Example 1

The method embodiment provided in Embodiment 1 of the present application can be executed in a mobile terminal, a computer terminal or the like. Taking a mobile terminal as an example, FIG. 1 is a hardware structural block diagram of a mobile terminal for adjusting an LCD signal according to an embodiment of the present invention. As shown in FIG. 1, the mobile terminal 10 may include one or more (only one shown) processor 102 (the processor 102 may include, but is not limited to, a Micro Control Unit (MCU) or a programmable logic device. A processing device such as an FPGA (Field Programmable Gate Array), a memory 104 provided to store data, and a transfer device 106 provided as a communication function. It will be understood by those skilled in the art that the structure shown in FIG. 1 is merely illustrative and does not limit the structure of the above electronic device. For example, the mobile terminal 10 may also include more or fewer components than those shown in FIG. 1, or have a different configuration than that shown in FIG.

The memory 104 can be configured as a software program and a module for storing application software, such as program instructions or modules corresponding to the adjustment method of the LCD signal in the embodiment of the present invention, and the processor 102 executes the software program and the module stored in the memory 104, thereby The above method is implemented by performing one or more functional applications and data processing. Memory 104 may include high speed random access memory, and may also include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, memory 104 may further include memory remotely located relative to processor 102, which may be connected to mobile terminal 10 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Transmission device 106 is arranged to receive or transmit data via a network. The above-described network specific example may include a wireless network provided by a communication provider of the mobile terminal 10. In one example, the transmission device 106 includes a Network Interface Controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 106 can be a Radio Frequency (RF) module for communicating with the Internet wirelessly.

In this embodiment, a method for adjusting an LCD signal running on the mobile terminal is provided. FIG. 2 is a flowchart of a method for adjusting an LCD signal according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202: Acquire a communication frequency band in which the current radio frequency network of the terminal is located;

Step S204, calculating a first working clock frequency according to the communication frequency band, wherein any harmonic component of the first working clock frequency is located outside the communication frequency band;

Step S206, adjusting the working clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency.

Through the above steps, the communication frequency band in which the current radio frequency network of the terminal is located is obtained, and then the first working clock frequency is calculated according to the communication frequency band, wherein any harmonic component of the first working clock frequency is located outside the communication frequency band, and finally the terminal The working clock frequency of the liquid crystal display LCD signal is adjusted to the first working clock frequency, and the LCD clock frequency is automatically adjusted according to the current communication frequency of the terminal, so that the clock harmonic component of the LCD signal falls outside the working frequency band, effectively avoiding the LCD The interference to the terminal signal can be applied to the situation in which the terminal RF signal is constantly changing, and the phase is solved. The problem of the interference of the LCD signal to the terminal RF signal cannot be automatically adjusted in the off technology.

Optionally, the execution body of the foregoing steps may be a terminal, such as a mobile phone with a screen, such as a mobile phone, but is not limited thereto.

Optionally, before acquiring the communication frequency band where the current radio network of the terminal is located, the method further includes the following steps:

S11. Determine whether the current radio frequency network of the terminal changes.

S12. When the determination result is yes, determine to obtain a communication frequency band in which the current radio frequency network of the terminal is located.

In this embodiment, when the LCD signal is a periodic signal, the first working clock frequency f(t) is calculated by the following formula:

Where a ₀ is the DC component of the LCD signal decomposed by Fourier transform, n is the harmonic order of the LCD signal, n is a positive integer, ω is the angular velocity, a _n is the amplitude of the nth cosine wave component, b _n Is the amplitude of the nth sine wave component.

Optionally, obtaining the communication frequency band in which the current radio frequency network of the terminal is located includes:

S21: Query the network type to which the radio network belongs, such as mobile, Unicom, 2G, 3G, and other network types;

S22. Determine a communication frequency band corresponding to the network type according to the preset frequency band allocation table. Since each network type network has an inherent network frequency band, for example, the China Unicom WCDMA2100 (B1 band) has an uplink frequency band of 1920-1980 megabits (M) in China and a downlink frequency band of 2110-2170M. The band allocation table can be preset in the terminal for direct matching search.

Optionally, adjusting the working clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency comprises: adjusting the frequency of the LCD signal to the first work by adjusting the frequency multiplication and frequency dividing parameters of the internal phase locked loop of the terminal. Clock frequency. Here is an example of the Qualcomm platform: the operating clock MIPI_DSI_CLK of the LCD is provided by the MCU internal phase-locked loop, and the output frequency can be adjusted by modifying the multiplier and frequency dividing parameters.

Specifically, how to adjust the frequency of the LCD signal to the first working clock frequency by adjusting the frequency multiplication and frequency division parameters of the internal phase-locked loop of the terminal can be implemented by well-known techniques of those skilled in the art, and is not used to limit the protection of the embodiment of the present invention. The scope is not repeated here.

The embodiment of the invention emphasizes that the frequency of the LCD signal is adjusted to the first working clock frequency, thereby reducing interference to the communication frequency band in which the current radio frequency network of the terminal is located.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a storage medium (such as a read only memory (ROM, Read). Only Memory) or Random Access Memory (RAM), including a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the present invention The method of each embodiment.

Example 2

In the embodiment, an adjustment device for the LCD signal is provided, and the device is configured to implement the above-mentioned embodiments and optional embodiments, and the description thereof has been omitted. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

3 is a structural block diagram of an apparatus for adjusting an LCD signal according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes:

The obtaining module 30 is configured to obtain a communication frequency band in which the current radio frequency network of the terminal is located;

The calculating module 32 is configured to calculate a first working clock frequency according to the communication frequency band, wherein any harmonic component of the first working clock frequency is located outside the communication frequency band;

The adjusting module 34 is configured to adjust the working clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency.

4 is a block diagram of an optional structure of an LCD signal adjusting apparatus according to an embodiment of the present invention. As shown in FIG. 4, the apparatus includes:

The determining module 40 is configured to determine whether the current radio frequency network of the terminal changes before the acquiring module 30 obtains the communication frequency band where the current radio frequency network of the terminal is located;

The obtaining module 30 is configured to determine, when the determination result is yes, the communication frequency band in which the current radio frequency network of the acquiring terminal is located.

Optionally, the calculation module is configured to: when the LCD signal is a periodic signal, calculate the first working clock frequency f(t) by using the following formula:

FIG. 5 is a block diagram 2 of an optional structure of an apparatus for adjusting an LCD signal according to an embodiment of the present invention. As shown in FIG. 5, the apparatus includes, in addition to all the modules shown in FIG.

The query unit 50 is configured to query a network type to which the radio network belongs.

The determining unit 52 is configured to determine a communication frequency band corresponding to the network type according to the preset frequency band allocation table.

Optionally, the adjusting module includes: an adjusting unit configured to adjust the frequency of the LCD signal to the first working clock frequency by adjusting the frequency multiplication and frequency dividing parameters of the internal phase locked loop of the terminal.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above multiple modules are The form of any combination is located in a different processor.

Example 3

This embodiment is an optional embodiment of the present invention and is used to explain the present invention in detail:

The operating frequency of the mobile phone LCD is not fixed, but is adjustable within a certain frequency range. The embodiment of the present invention can use different frequency LCD clocks for the network frequency band in which the mobile terminal such as a mobile phone is located, and the clock and the frequency of any harmonic components it contains are not in the current working frequency band of the mobile phone, thus effectively avoiding The interference of the LCD clock to the RF.

When the working frequency band of the mobile phone changes, the central processing unit (CPU, Center Processing Unit) can also automatically check and adjust the working clock of the LCD. The harmonic component of the LCD clock is always outside the working frequency band of the mobile phone.

The embodiment of the present invention mainly solves the problem of the LCD clock frequency interference radio frequency index, and FIG. 6 is a schematic diagram of the workflow of the embodiment of the present invention, including:

Step S601: Query the current network to obtain the communication frequency band of the current network;

Step S602: The software calculates an LCD operating clock frequency such that any harmonic component of the clock falls outside the communication band;

Step S603: Adjust the LCD clock frequency to the calculated clock frequency.

Step S601 is to query the network where the mobile terminal is located, and obtain the current network information by using a software query record or a log LOG. Table 1 is the frequency band allocation table of this embodiment. Table 1 lists each working frequency band of the terminal communication. For example, the software finds that the current network is China Unicom WCDMA2100 (B1 frequency band), the uplink frequency band is 1920-1980M, and the downlink frequency band is 2110-2170M, (actually the frequency bands allocated to Unicom in China are 1940-1955M and 2130-2145M). When optimizing the LCD operating clock, ensure that the frequency of harmonic components falls outside this band.

Step S602 is to optimize the clock frequency of the LCD, and the processor automatically calculates an optimal working clock according to the harmonic theory. The periodic signal can be decomposed by the Fourier transform into a linear superposition of the DC component a ₀ and the sinusoidal signals of different frequencies:

n=1, called first harmonic (fundamental wave), n=2, 3, 4... is called higher harmonic, FIG. 7 is a schematic diagram of the fundamental wave and harmonic waveform of the embodiment of the present invention, as shown in FIG. The frequency of the harmonics: f = ω / 2π. The frequency of the higher harmonic is an integer multiple of the fundamental wave, such as the fundamental frequency is 50 MHz, the second harmonic frequency is 100 MHz, the third harmonic frequency is 150 MHz, and so on. The frequency of the fundamental wave can be set by software so that the frequency of the harmonic component can be calculated to avoid the current operating frequency band of the mobile phone.

Step S603 resets the LCD clock frequency, taking the high-pass platform as an example: the operating clock MIPI_DSI_CLK of the LCD is provided by the internal phase-locked loop of the MCU, and the output frequency can be adjusted by modifying the frequency multiplication and frequency division parameters. When calculating the required clock frequency at S602, it is preferable to calculate the relevant configuration parameters.

In this embodiment, the working frequency band of the mobile phone is detected in real time, and the LCD clock frequency is automatically optimized and adjusted. After the mobile phone switches the network, for example, 4G switched from 3G, the LCD clock frequency is also re-adjusted.

Optionally, step S602 calculates an required clock frequency by using an algorithm, and if the CPU uses real-time calculation, the resource is wasted, and the algorithm is complicated. When the mobile terminal enters the network, the supported network will be clearly defined. According to the actual working frequency band, the LCD clock corresponding to each frequency band and the configuration parameters of the phase locked loop are first calculated and placed in the memory. When the mobile phone is working, you can directly check the table to adjust the LCD working frequency. This does not require system recalculation to reduce power consumption.

Whether the calculated clock frequency is appropriate or not can be verified by the spectrum analyzer to see if the high-frequency harmonic component of the clock falls outside the working frequency band.

As the frequency band of mobile phones continues to increase, it is difficult to avoid interference with signals using a single LCD clock frequency. In the embodiment, on the basis of the traditional EMI (Electro Magnetic Interference), the clock frequency is automatically adjusted, so that the clock harmonic component falls outside the working frequency band, and the interference of the LCD on the mobile phone signal can be effectively avoided. The method of the example is useful for all frequency bands.

Example 4

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S1: Obtain a communication frequency band in which the current radio frequency network of the terminal is located;

S2, calculating a first working clock frequency according to the communication frequency band, wherein any harmonic component of the first working clock frequency is outside the communication frequency band;

S3, adjusting the working clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

Optionally, in this embodiment, the processor performs, according to the stored program code in the storage medium, the communication frequency band in which the current radio frequency network of the terminal is located;

Optionally, in this embodiment, the processor calculates, according to the stored program code in the storage medium, a first working clock frequency according to the communication frequency band, where any harmonic component of the first working clock frequency is located outside the communication frequency band. ;

Optionally, in this embodiment, the processor performs to adjust the working clock frequency of the liquid crystal display LCD signal of the terminal to the first working clock frequency according to the stored program code in the storage medium.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that each of the above-described modules or steps of the present invention can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed across multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program in a storage and a memory by a processor. / instruction to achieve its corresponding function. The invention is not limited to any specific form of combination of hardware and software.

The above description is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and one or more modifications and changes may be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The above technical solution effectively avoids the interference of the LCD on the terminal signal.

Claims

A method for adjusting an LCD signal of a liquid crystal display, comprising:

Obtaining the communication frequency band where the current radio network of the terminal is located;

Calculating a first working clock frequency according to the communication frequency band, wherein any harmonic component of the first working clock frequency is located outside the communication frequency band;

Adjusting an operating clock frequency of the LCD signal of the terminal to the first operating clock frequency.
The method of claim 1 further comprising:

Before obtaining the communication band in which the current RF network of the terminal is located,

Determining whether the current radio frequency network of the terminal changes;

When the judgment result is yes, it is determined that the communication frequency band in which the current radio frequency network of the terminal is located is obtained.
The method according to claim 1, wherein said first operating clock frequency f(t) is calculated by the following formula when said LCD signal is a periodic signal:

Wherein a 0 is a DC component of the LCD signal decomposed by Fourier transform, n is a harmonic order of the LCD signal, n is a positive integer, ω is an angular velocity, and a n is a cosine wave The amplitude of the component, b n is the amplitude of the nth sine wave component.
The method of claim 1, wherein obtaining the communication frequency band in which the current radio frequency network of the terminal is located includes:

Query the network type to which the radio network belongs.

A communication frequency band corresponding to the network type is determined according to a preset frequency band allocation table.
The method of claim 1, wherein adjusting an operating clock frequency of the LCD signal of the terminal to the first operating clock frequency comprises:

The frequency of the LCD signal is adjusted to the first operating clock frequency by adjusting a frequency multiplication and frequency dividing parameter of an internal phase locked loop of the terminal.
An LCD signal adjustment device for a liquid crystal display, comprising:

Obtaining a module, configured to obtain a communication frequency band in which the current radio network of the terminal is located;

a calculation module, configured to calculate a first working clock frequency according to the communication frequency band, wherein any harmonic component of the first working clock frequency is located outside the communication frequency band;

The adjustment module is configured to adjust an operating clock frequency of the LCD signal of the terminal to the first working clock frequency.
The apparatus of claim 6 further comprising:

The determining module is configured to determine whether the current radio frequency network of the terminal changes before the acquiring module acquires the communication frequency band where the current radio network of the terminal is located;

The obtaining module is configured to determine, when the determination result is yes, the communication frequency band in which the current radio frequency network of the acquiring terminal is located.
The apparatus of claim 6 wherein said computing module is configured to:

When the LCD signal is a periodic signal, the first working clock frequency f(t) is calculated by the following formula:

Wherein a 0 is a DC component of the LCD signal decomposed by Fourier transform, n is a harmonic order of the LCD signal, n is a positive integer, ω is an angular velocity, and a n is a cosine wave The amplitude of the component, b n is the amplitude of the nth sine wave component.
The apparatus of claim 6, wherein the obtaining module comprises:

The query unit is configured to query a network type to which the radio network belongs;

The determining unit is configured to determine a communication frequency band corresponding to the network type according to the preset frequency band allocation table.
The apparatus of claim 6 wherein the adjustment module comprises:

And an adjusting unit configured to adjust a frequency of the LCD signal to the first working clock frequency by adjusting a frequency multiplication and frequency dividing parameter of an internal phase locked loop of the terminal.