CN108307012B - Mobile terminal and control system and method of telephone receiver - Google Patents
Mobile terminal and control system and method of telephone receiver Download PDFInfo
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- CN108307012B CN108307012B CN201810069386.XA CN201810069386A CN108307012B CN 108307012 B CN108307012 B CN 108307012B CN 201810069386 A CN201810069386 A CN 201810069386A CN 108307012 B CN108307012 B CN 108307012B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
Abstract
The invention discloses a mobile terminal and a control system and a control method of a telephone receiver. Wherein, the control system of receiver includes: the device comprises a receiving module, a detection module and a processing module; the receiving module and the detection module are both electrically connected with a voice coil of the telephone receiver; the detection module is also electrically connected with the processing module; the receiving module is used for receiving an audio electric signal and inputting the audio electric signal to the voice coil; the detection module is used for detecting the current resistance value of the voice coil; the processing module is used for calculating the maximum allowable voltage amplitude of the audio electric signal according to the current resistance value and the maximum linear displacement of the voice coil, and adjusting the current voltage amplitude of the audio electric signal to be lower than the maximum allowable voltage amplitude. The invention realizes the feedback control of the telephone receiver, ensures that the voltage amplitude of the audio electric signal is always below the maximum allowable voltage amplitude, and avoids the sound breaking phenomenon of the telephone receiver.
Description
Technical Field
The invention relates to the technical field of electronic products, in particular to a mobile terminal and a control system and method of a receiver.
Background
The driver of the existing receiver is of a one-way driving type, namely, an audio electric signal U is input to a voice coil of the receiver, and the power of the receiver is controlled not to exceed a rated power PeAnd the audio electric signal is converted into a sound signal. Due to Pe＝URMS 2/R，URMSR is the resistance of the voice coil (generally set to 32 omega) for rated voltage, so that the power of the receiver is controlled not to exceed rated power PeI.e. the average magnitude of the audio electrical signal U input to the voice coil is controlled not to exceed URMS。
In the prior art, in the one-way driving mode of the telephone receiver, the vibration amplitude of the voice coil is not controlled, and the phenomenon of broken sound lines caused by overlarge vibration amplitude of the voice coil due to the overlarge instantaneous amplitude of the audio electric signal U often occurs.
Disclosure of Invention
The invention aims to overcome the defect that the vibration amplitude of a voice coil is too large to cause a sound wire breaking phenomenon due to the fact that the vibration amplitude of the voice coil is not controlled in the prior art, and provides a control system and a control method of a mobile terminal and a receiver.
The invention solves the technical problems through the following technical scheme:
a control system of a telephone receiver comprises a voice coil;
the control system comprises: the device comprises a receiving module, a detection module and a processing module;
the receiving module and the detecting module are both electrically connected with the voice coil; the detection module is also electrically connected with the processing module;
the receiving module is used for receiving an audio electric signal and inputting the audio electric signal to the voice coil;
the detection module is used for detecting the current resistance value of the voice coil;
the processing module is used for calculating the maximum allowable voltage amplitude of the audio electric signal according to the current resistance value and the maximum linear displacement of the voice coil, and adjusting the current voltage amplitude of the audio electric signal to be lower than the maximum allowable voltage amplitude.
Optionally, the receiver further comprises a sound cavity; the voice coil is positioned in the sound cavity;
the processing module comprises: the device comprises a temperature calculation unit, a frequency calculation unit and an amplitude calculation unit;
the frequency calculation unit is electrically connected with the temperature calculation unit and the amplitude calculation unit respectively;
the temperature calculation unit is used for calculating the current temperature of the voice coil according to the current resistance value;
the frequency calculation unit is used for calculating the resonant frequency of the sound cavity according to the current temperature;
the amplitude calculation unit is used for calculating the maximum allowable voltage amplitude according to the resonance frequency and the maximum linear displacement.
Optionally, the temperature calculating unit is specifically configured to calculate the current temperature by using the following formula:
wherein T is the current temperature of the voice coil, R is the current resistance value of the voice coil, ReIs the direct current resistance, T, of the voice coilcoefIs a characteristic temperature coefficient, T, of the voice coil0Is the soundThe initial temperature of the loop.
Optionally, the frequency calculating unit is specifically configured to calculate the resonant frequency by the following formula:
wherein f is the resonance frequency, KmsIs the coefficient of dynamics, M, of the voice coil at the current temperaturemsIs the equivalent vibrating mass of the sound cavity.
Optionally, the amplitude calculating unit is specifically configured to calculate the maximum allowable voltage amplitude by using the following formula:
the U is0Is the maximum allowable voltage amplitude, η0For reference to the efficiency of electro-acoustic conversion, XmaxAnd a is the equivalent radius of the sound cavity, which is the maximum linear displacement of the voice coil.
Optionally, the processing module further comprises: a digital signal processor, a power amplifier and a boost circuit;
the input end of the digital signal processor is electrically connected with the receiving module, the output end of the digital signal processor is electrically connected with the input end of the power amplifier, the output end of the power amplifier is electrically connected with the voice coil, the output end of the boost circuit is electrically connected with the power supply end of the power amplifier, and the control end of the boost circuit is electrically connected with the amplitude calculation unit;
the digital signal processor is used for acquiring the current voltage amplitude of the audio electric signal and inputting the current voltage amplitude to the power amplifier;
the boost circuit is used for generating a supply voltage according to the maximum allowable voltage amplitude and inputting the supply voltage to the power amplifier;
the power amplifier is used for adjusting the current voltage amplitude according to the power supply voltage.
The invention also provides a control method of the telephone receiver, wherein the telephone receiver comprises a voice coil;
the control method comprises the following steps:
inputting an audio electrical signal to the voice coil;
detecting a current resistance value of the voice coil;
and calculating the maximum allowable voltage amplitude of the audio electric signal according to the current resistance value and the maximum linear displacement of the voice coil, and adjusting the current voltage amplitude of the audio electric signal to be lower than the maximum allowable voltage amplitude.
Optionally, the receiver further comprises a sound cavity; the voice coil is positioned in the sound cavity;
the calculating the maximum allowable voltage amplitude of the audio electric signal according to the current resistance value and the maximum linear displacement of the receiver comprises:
calculating the current temperature of the voice coil according to the current resistance value;
calculating the resonant frequency of the sound cavity according to the current temperature;
and calculating the maximum allowable voltage amplitude according to the resonance frequency and the maximum linear displacement.
Optionally, the calculating the current temperature of the voice coil according to the current resistance value specifically includes:
calculating the current temperature by the following formula;
wherein T is the current temperature of the voice coil, R is the current resistance value of the voice coil, ReIs the direct current resistance, T, of the voice coilcoefIs a characteristic temperature coefficient, T, of the voice coil0Is the initial temperature of the voice coil.
Optionally, the calculating the resonant frequency of the sound cavity according to the current temperature specifically includes:
calculating the resonance frequency by the following formula;
wherein f is the resonance frequency, KmsIs the coefficient of dynamics, M, of the voice coil at the current temperaturemsIs the equivalent vibrating mass of the sound cavity.
Optionally, the calculating the maximum allowable voltage amplitude according to the resonant frequency and the maximum linear displacement specifically includes:
calculating the maximum allowable voltage amplitude by the following formula;
the U is0Is the maximum allowable voltage amplitude, η0For reference to the efficiency of electro-acoustic conversion, XmaxAnd a is the equivalent radius of the sound cavity, which is the maximum linear displacement of the voice coil.
The invention also provides a mobile terminal which comprises a telephone receiver and the control system of the telephone receiver.
The positive progress effects of the invention are as follows: the voice coil feedback control method and the voice coil feedback control device realize feedback control on the receiver, and ensure that the voltage amplitude of the audio electric signal is always below the maximum allowable voltage amplitude, thereby ensuring that the vibration amplitude of the voice coil is always smaller than the maximum linear displacement of the voice coil, and avoiding the sound breaking phenomenon of the receiver.
Drawings
Fig. 1 is a schematic structural diagram of a receiver.
Fig. 2 is a block diagram of a control system of a receiver according to embodiment 1 of the present invention.
Fig. 3 is a block diagram of a control system of a receiver according to embodiment 2 of the present invention.
Fig. 4 is a flowchart of a receiver control method according to embodiment 3 of the present invention.
Fig. 5 is a flowchart of a receiver control method according to embodiment 4 of the present invention.
Fig. 6 is a module diagram of a mobile terminal according to embodiment 5 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a control system of a telephone receiver, which is suitable for various terminal devices comprising the telephone receiver. In order to better understand the improvement of the present invention with respect to the prior art, the structure and the operation principle of the receiver will be described first before the detailed description of the specific embodiment of the present invention:
as shown in fig. 1, the receiver includes a voice coil 11, a sound cavity 12, a permanent magnet 13 and a diaphragm 14, the voice coil 11, the permanent magnet 13 and the diaphragm 14 are all disposed in the sound cavity 12, and the voice coil 11 is connected to the diaphragm 14. When an audio electrical signal is input to the voice coil 11, under the action of the audio electrical signal and the magnetic field, the voice coil 11 generates a driving force, and the diaphragm 14 vibrates after being stressed to press air in the sound cavity 12 to generate sound, so that the audio electrical signal is converted into a sound signal. It should be noted that the voice coil 11 cannot jump out of the magnetic gap, that is, the amplitude of the voice coil 11 cannot be larger than the maximum linear displacement of the voice coil 11 (the maximum linear displacement is a parameter representing the performance of the receiver and mainly depends on the magnetic circuit structure and the voice coil winding width), otherwise, a large nonlinear distortion (represented by an amplitude abnormal sound) may be generated, and even the voice coil 11 may be damaged (jammed or burned).
As shown in fig. 2, the control system of the present embodiment includes: a receiving module 21, a detecting module 22 and a processing module 23. The receiving module 21 and the detecting module 22 are both electrically connected to the voice coil 11, and the detecting module 22 is also electrically connected to the processing module 23.
The operation of the control system of the present embodiment is described below:
the receiving module 21 receives an audio electric signal, which is generally output by an audio control module of the terminal device. The receiving module 21 inputs the audio electric signal to the voice coil 11. When the receiving module 21 receives the audio electrical signal, the detecting module 22 detects the current resistance value of the voice coil 11 in real time and sends the current resistance value to the processing module 23. The processing module 23 calculates the maximum allowable voltage amplitude of the audio electrical signal according to the current resistance value and the maximum linear displacement of the voice coil 11, and adjusts the current voltage amplitude of the audio electrical signal to be lower than the maximum allowable voltage amplitude. The maximum allowable voltage amplitude is the amplitude of the corresponding audio electrical signal when the amplitude of the voice coil 11 is at the maximum linear displacement.
The control system of the embodiment realizes feedback control on the receiver, and ensures that the voltage amplitude of the audio electrical signal is always below the maximum allowable voltage amplitude, thereby ensuring that the vibration amplitude of the voice coil is always smaller than the maximum linear displacement of the voice coil, and avoiding the sound breaking phenomenon of the receiver.
Example 2
On the basis of embodiment 1, as shown in fig. 3, the processing module 23 of this embodiment includes: a temperature calculation unit 231, a frequency calculation unit 232, and a magnitude calculation unit 233. The frequency calculation unit 232 is electrically connected to the temperature calculation unit 231 and the amplitude calculation unit 233, respectively, and the temperature calculation unit 231 is also electrically connected to the detection module 22.
The following provides a specific implementation manner of calculating the maximum allowable voltage amplitude by the processing module:
the detecting module 22 sends the current resistance value to the processing module 23, and the temperature calculating unit 231 calculates the current temperature of the voice coil 11 according to the current resistance value. Specifically, the temperature calculation unit 231 calculates the current temperature by the following formula:
wherein T is the current temperature of the voice coil, R is the current resistance value of the voice coil, ReIs the direct current resistance of the voice coil, TcoefIs the characteristic temperature coefficient, T, of the voice coil0Is the initial temperature of the voice coil.
The frequency calculation unit 232 calculates the resonance frequency of the acoustic cavity 12 based on the current temperature. Specifically, the frequency calculation unit calculates the resonance frequency by the following formula:
wherein f is the resonance frequency, KmsIs the coefficient of dynamics of the voice coil at the current temperature, MmsIs the equivalent vibrating mass of the sound cavity.
The amplitude calculation unit 233 calculates the maximum allowable voltage amplitude from the resonance frequency and the maximum linear displacement. Specifically, the amplitude calculation unit calculates the maximum allowable voltage amplitude by the following formula:
U0is the maximum allowable voltage amplitude, η0For reference to the efficiency of electro-acoustic conversion, XmaxAnd a is the equivalent radius of the sound cavity, which is the maximum linear displacement of the voice coil.
In this embodiment, the dc resistance of the voice coil, the characteristic temperature coefficient of the voice coil, the initial temperature of the voice coil, the equivalent vibration mass of the voice cavity, the dynamic coefficient of the voice coil, and the equivalent radius of the voice cavity are all parameters representing the performance of the telephone receiver. The direct current resistance of the voice coil, the characteristic temperature coefficient of the voice coil, the initial temperature of the voice coil, the equivalent vibration mass of the sound cavity and the equivalent radius of the sound cavity are constants; and the power coefficient of the voice coil is a variable, and the power coefficient is obtained according to the corresponding relation between the temperature and the power coefficient and the current temperature of the voice coil.
The following provides a specific implementation manner of the processing module adjusting the current voltage amplitude of the audio electrical signal:
referring to fig. 3, the processing module of this embodiment further includes: a digital signal processor 234, a power amplifier 235, and a boost circuit 236. The input end of the digital signal processor 234 is electrically connected to the receiving module 21, the output end of the digital signal processor 234 is electrically connected to the input end of the power amplifier 235, the output end of the power amplifier 235 is electrically connected to the voice coil 11, the output end of the boost circuit 236 is electrically connected to the power supply end of the power amplifier 235, and the control end of the boost circuit 236 is electrically connected to the amplitude calculating unit 233.
When the voltage amplitude of the audio electrical signal is adjusted, the digital signal processor 234 acquires the current voltage amplitude and the signal frequency of the audio electrical signal and inputs the current voltage amplitude and the signal frequency to the power amplifier 235. The boost circuit 236 generates a supply voltage according to the maximum allowable voltage amplitude calculated by the amplitude calculation unit 233, inputs the supply voltage to the power amplifier 235, determines the amplification factor of the power amplifier 235 according to the supply voltage, and adjusts the current voltage amplitude by the power amplifier 235.
In the embodiment, the boost circuit, the digital signal processor and the power amplifier are utilized to realize the accurate control of the telephone receiver, and the current voltage amplitude of the audio electrical signal is ensured to be always below the maximum allowable voltage amplitude, so that the nonlinear distortion of the audio electrical signal is avoided, the tone quality and loudness of the telephone receiver are comprehensively improved, and meanwhile, the consumed power of the telephone receiver is greatly reduced.
Example 3
A control method of the receiver provided based on the above embodiment is given below. As shown in fig. 4, the method for controlling a receiver of this embodiment includes the following steps:
And 102, detecting the current resistance value of the voice coil.
And 103, calculating the maximum allowable voltage amplitude of the audio electric signal according to the current resistance value and the maximum linear displacement of the voice coil.
The maximum linear displacement of the voice coil is a parameter representing the performance of the receiver, and mainly depends on the magnetic circuit structure and the voice coil winding width.
And 104, adjusting the current voltage amplitude of the audio electric signal to be lower than the maximum allowable voltage amplitude.
The maximum allowable voltage amplitude is the amplitude of the corresponding audio electrical signal when the amplitude of the voice coil is at the maximum linear displacement.
The control of the embodiment realizes the feedback control of the telephone receiver, and ensures that the voltage amplitude of the audio electrical signal is always below the maximum allowable voltage amplitude, thereby ensuring that the vibration amplitude of the voice coil is always smaller than the maximum linear displacement of the voice coil, and avoiding the sound breaking phenomenon of the telephone receiver.
Example 4
On the basis of embodiment 3, as shown in fig. 5, in this embodiment, step 103 specifically includes:
and 103-1, calculating the current temperature of the voice coil according to the current resistance value.
Preferably, in step 103-1, the current temperature is calculated by the following formula;
wherein T is the current temperature of the voice coil, R is the current resistance value of the voice coil, ReIs the direct current resistance of the voice coil, TcoefIs the characteristic temperature coefficient, T, of the voice coil0Is the initial temperature of the voice coil.
And step 103-2, calculating the resonant frequency of the sound cavity according to the current temperature.
Preferably, in step 103-2, the resonant frequency is calculated by the following formula:
wherein f is the resonance frequency, KmsIs the coefficient of dynamics of the voice coil at the current temperature, MmsIs the equivalent vibrating mass of the sound cavity.
And 103-3, calculating the maximum allowable voltage amplitude according to the resonance frequency and the maximum linear displacement.
Preferably, in step 103-3, the maximum allowable voltage amplitude is calculated by the following formula:
U0is the maximum allowable voltage amplitude, η0For reference to the efficiency of electro-acoustic conversion, XmaxAnd a is the equivalent radius of the sound cavity, which is the maximum linear displacement of the voice coil.
In this embodiment, the dc resistance of the voice coil, the characteristic temperature coefficient of the voice coil, the initial temperature of the voice coil, the equivalent vibration mass of the voice cavity, the dynamic coefficient of the voice coil, and the equivalent radius of the voice cavity are all parameters representing the performance of the telephone receiver. The direct current resistance of the voice coil, the characteristic temperature coefficient of the voice coil, the initial temperature of the voice coil, the equivalent vibration mass of the sound cavity and the equivalent radius of the sound cavity are constants; and the power coefficient of the voice coil is a variable, and the power coefficient is obtained according to the corresponding relation between the temperature and the power coefficient and the current temperature of the voice coil.
The control method of the embodiment realizes the accurate control of the telephone receiver, ensures that the current voltage amplitude of the audio electric signal is always below the maximum allowable voltage amplitude, not only avoids the nonlinear distortion of the audio electric signal, comprehensively improves the tone quality and loudness of the telephone receiver, but also greatly reduces the consumed power of the telephone receiver.
Example 5
The present embodiment provides a mobile terminal, as shown in fig. 6, which includes a receiver 10, an audio control module 32, a processor 33, and a control system 31 of the receiver in any of the above embodiments. Of course, the mobile terminal should further include other components such as a communication module, a display unit, and a sensor, which are not described herein again. The audio control module 32 is electrically connected to the processor 33 and the receiver 10, and the receiver 10 is further electrically connected to the control system 31 of the receiver.
In this embodiment, the audio control module 32 outputs the audio electrical signal to the receiver 10 under the control of the processor 33, and the control system 31 adjusts the audio electrical signal input to the receiver 10 in real time, so as to ensure that the voltage amplitude of the audio electrical signal is always below the maximum allowable voltage amplitude, thereby implementing feedback control on the receiver, not only improving the sound quality of the receiver, but also reducing the power consumption of the receiver, and effectively prolonging the endurance time and the service time of the battery of the mobile terminal.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (6)
1. A control system of a telephone receiver is characterized in that the telephone receiver comprises a voice coil;
the control system comprises: the device comprises a receiving module, a detection module and a processing module;
the receiving module and the detecting module are both electrically connected with the voice coil; the detection module is also electrically connected with the processing module;
the receiving module is used for receiving an audio electric signal and inputting the audio electric signal to the voice coil;
the detection module is used for detecting the current resistance value of the voice coil;
the processing module is used for calculating the maximum allowable voltage amplitude of the audio electric signal according to the current resistance value and the maximum linear displacement of the voice coil, and adjusting the current voltage amplitude of the audio electric signal to be lower than the maximum allowable voltage amplitude;
the processing module is specifically configured to calculate the current temperature by the following formula:
wherein T is the current temperature of the voice coil, R is the current resistance value of the voice coil, ReIs the direct current resistance, T, of the voice coilcoefIs a characteristic temperature coefficient, T, of the voice coil0Is the initial temperature of the voice coil;
the processing module is specifically further configured to calculate the resonant frequency by the following formula:
wherein f is the resonance frequency, KmsIs the coefficient of dynamics, M, of the voice coil at the current temperaturemsIs the equivalent vibration mass of the sound cavity;
the processing module is specifically further configured to calculate the maximum allowable voltage amplitude by using the following formula:
U0is the maximum allowable voltage amplitude, η0For reference to the efficiency of electro-acoustic conversion, XmaxAnd a is the equivalent radius of the sound cavity, which is the maximum linear displacement of the voice coil.
2. The control system of claim 1, wherein the receiver further comprises a sound chamber; the voice coil is positioned in the sound cavity;
the processing module comprises: the device comprises a temperature calculation unit, a frequency calculation unit and an amplitude calculation unit;
the frequency calculation unit is electrically connected with the temperature calculation unit and the amplitude calculation unit respectively;
the temperature calculation unit is used for calculating the current temperature of the voice coil according to the current resistance value;
the frequency calculation unit is used for calculating the resonant frequency of the sound cavity according to the current temperature;
the amplitude calculation unit is used for calculating the maximum allowable voltage amplitude according to the resonance frequency and the maximum linear displacement.
3. The control system of claim 2, wherein the processing module further comprises: a digital signal processor, a power amplifier and a boost circuit;
the input end of the digital signal processor is electrically connected with the receiving module, the output end of the digital signal processor is electrically connected with the input end of the power amplifier, the output end of the power amplifier is electrically connected with the voice coil, the output end of the boost circuit is electrically connected with the power supply end of the power amplifier, and the control end of the boost circuit is electrically connected with the amplitude calculation unit;
the digital signal processor is used for acquiring the current voltage amplitude of the audio electric signal and inputting the current voltage amplitude to the power amplifier;
the boost circuit is used for generating a supply voltage according to the maximum allowable voltage amplitude and inputting the supply voltage to the power amplifier;
the power amplifier is used for adjusting the current voltage amplitude according to the power supply voltage.
4. A control method of a telephone receiver is characterized in that the telephone receiver comprises a voice coil;
the control method comprises the following steps:
inputting an audio electrical signal to the voice coil;
detecting a current resistance value of the voice coil;
calculating the maximum allowable voltage amplitude of the audio electric signal according to the current resistance value and the maximum linear displacement of the voice coil, and adjusting the current voltage amplitude of the audio electric signal to be lower than the maximum allowable voltage amplitude;
the step of calculating the maximum allowable voltage amplitude of the audio electrical signal according to the current resistance value and the maximum linear displacement of the voice coil specifically includes:
calculating the current temperature by the following formula;
wherein T is the current temperature of the voice coil, R is the current resistance value of the voice coil, ReIs the direct current resistance, T, of the voice coilcoefIs a characteristic temperature coefficient, T, of the voice coil0Is the initial temperature of the voice coil;
calculating a resonance frequency by the following formula;
wherein f is the resonance frequency, KmsIs the coefficient of dynamics, M, of the voice coil at the current temperaturemsIs the equivalent vibration mass of the sound cavity;
the calculating the maximum allowable voltage amplitude according to the resonance frequency and the maximum linear displacement specifically includes:
calculating the maximum allowable voltage amplitude by the following formula;
U0is the maximum allowable voltage amplitude, η0For reference to the efficiency of electro-acoustic conversion, XmaxAnd a is the equivalent radius of the sound cavity, which is the maximum linear displacement of the voice coil.
5. The control method of claim 4, wherein the receiver further comprises a sound chamber; the voice coil is positioned in the sound cavity;
the calculating the maximum allowable voltage amplitude of the audio electrical signal according to the current resistance value and the maximum linear displacement of the voice coil comprises:
calculating the current temperature of the voice coil according to the current resistance value;
calculating the resonant frequency of the sound cavity according to the current temperature;
and calculating the maximum allowable voltage amplitude according to the resonance frequency and the maximum linear displacement.
6. A mobile terminal, characterized in that it comprises a receiver and a control system of a receiver according to any of claims 1-3.
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| CN104811154A (en) * | 2014-01-28 | 2015-07-29 | 宏达国际电子股份有限公司 | Sound producing system and audio amplifying method thereof |
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