CN212435907U - Antenna circuit, bluetooth headset and terminal equipment - Google Patents

Abstract

The utility model provides an antenna circuit, a Bluetooth headset and a terminal device, wherein the antenna circuit is applied to the Bluetooth headset and comprises a Bluetooth chip and an audio antenna, and an antenna tuning module is connected between the Bluetooth chip and the audio antenna; the Bluetooth chip is used for acquiring a tone quality adjustment request signal sent by the terminal equipment; the tone quality adjustment request signal includes a target tone quality level; adjust antenna tuning module according to target tone quality grade to make audio antenna's return loss be in predetermineeing the return loss within range, the utility model discloses a bluetooth chip can adjust antenna tuning module according to target tone quality grade after obtaining target tone quality grade, so that audio antenna's return loss returns to predetermineeing the return loss within range, resumes the antenna performance, has solved the problem that sound signal appears the card and pauses, intermittent or the distortion.

Description

Antenna circuit, bluetooth headset and terminal equipment

Technical Field

The utility model relates to a bluetooth technical field particularly, relates to an antenna circuit, bluetooth headset and terminal equipment.

Background

Along with the progress of science and technology, the utilization rate of the Bluetooth headset is higher and higher, and the Bluetooth headset is a portable small listening device based on the existing mature Bluetooth technology, and free voice interaction can be realized without directly connecting the Bluetooth headset with communication equipment (a mobile phone, a computer and the like) through a cable.

In the prior art, an audio line of a bluetooth headset can be used as an audio antenna to realize signal transmission with other communication devices, but due to the fact that different human bodies have large influence on the audio antenna, return loss of an antenna signal is easy to deviate from a normal range, and the phenomenon of blocking, distortion or interruption of a sound signal transmitted through the audio antenna is caused.

Therefore, how to avoid the phenomenon of blocking, distortion or discontinuity of the sound signal of the bluetooth headset is a technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an antenna circuit, bluetooth headset and terminal equipment for the sound signal of avoiding bluetooth headset appears blocking absolutely, distortion or discontinuous phenomenon.

In order to achieve the above purpose, the utility model discloses technical scheme as follows:

in a first aspect, the present invention provides an antenna circuit for a bluetooth headset, including a bluetooth chip and an audio antenna; an antenna tuning module is connected between the Bluetooth chip and the audio antenna; the Bluetooth chip is used for acquiring a tone quality adjustment request signal sent by the terminal equipment; the tone quality adjustment request signal comprises a target tone quality grade; and adjusting the antenna tuning module according to the target tone quality grade so as to enable the return loss of the audio antenna to be within a preset return loss range.

Optionally, the antenna tuning module comprises an adjustable capacitance; when the capacitance value of the adjustable capacitor is a preset capacitance value, the return loss of the audio antenna is within the preset return loss range; the preset capacitance value corresponds to the tone quality grade; the Bluetooth chip is also used for determining a preset capacitance value corresponding to the target tone quality grade; and adjusting the capacitance value of the adjustable capacitor to be consistent with the preset capacitance value.

Optionally, a first radio frequency module is connected between the bluetooth chip and the antenna tuning module; the audio antenna is used for receiving a tone quality adjustment request signal sent by a terminal and transmitting the tone quality request signal to the first radio frequency module; and the first radio frequency module is used for transmitting the obtained tone quality adjustment request signal to the Bluetooth chip after signal processing.

Optionally, an audio module is further connected between the bluetooth chip and the audio antenna; the audio antenna is also used for receiving audio signals sent by the terminal equipment; and the audio module is used for transmitting the audio signal to the loudspeaker of the Bluetooth headset through the audio antenna.

Optionally, the audio antenna is further configured to receive a pairing request signal sent by the terminal; the Bluetooth chip is further used for establishing wireless connection with the terminal equipment according to the pairing request signal.

In a second aspect, the present invention provides a bluetooth headset comprising an antenna circuit as described in the first aspect.

In a third aspect, the present invention provides a terminal device, including a tone quality control module and a sending module; the sending module is electrically connected with the tone quality control module; the tone quality control module is used for sending the tone quality adjusting signal to the Bluetooth headset through the sending module; the tone quality adjustment signal contains the target level; and the target grade is used for indicating the Bluetooth headset to adjust the return loss of the audio antenna within a preset return loss range.

Optionally, a display module is further included; the display module is electrically connected with the tone quality control module; the display module is used for displaying the tone quality adjustment grade, receiving an operation instruction of selecting the target tone quality grade by a user, and transmitting the operation instruction to the tone quality control module; and the tone quality control module is also used for generating the tone quality adjustment request signal according to the operation instruction.

Optionally, a second radio frequency module is further connected between the tone quality control module and the sending module; the tone quality control module is used for transmitting the tone quality control module to the second radio frequency module; and the second radio frequency module is used for transmitting the received tone quality adjusting signal to the sending module after signal processing.

Optionally, the tone quality control module is further configured to send a pairing request signal to the bluetooth headset through the sending module; the pairing request signal is used for indicating the Bluetooth headset to establish wireless connection with the terminal equipment.

The embodiment of the utility model provides an antenna circuit, bluetooth headset and terminal equipment, this antenna circuit is applied to bluetooth headset, including bluetooth chip, audio antenna, is connected with the antenna tuning module between bluetooth chip and the audio antenna; the Bluetooth chip is used for acquiring a tone quality adjustment request signal sent by the terminal equipment; the tone quality adjustment request signal includes a target tone quality level; adjust antenna tuning module according to target tone quality grade to make audio antenna's return loss in predetermineeing the return loss within range, in the sound signal of audio antenna transmission can not appear the card pause, interrupted or the condition of distortion, the embodiment of the utility model provides an in the back of the bluetooth chip obtains the tone quality grade, can adjust antenna tuning module according to the tone quality grade, make so that audio antenna's return loss returns to predetermineeing the return loss within range, resumes the antenna performance, solved the problem that sound signal appears the card pause, interrupted or the distortion.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a neck hanging type Bluetooth headset;

FIG. 2 is a graph of return loss versus operating frequency for an antenna;

fig. 3 is a schematic structural diagram of an antenna circuit according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another antenna circuit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another antenna circuit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another antenna circuit according to an embodiment of the present invention;

fig. 7 is a schematic view of an antenna circuit connection of a bluetooth headset according to an embodiment of the present invention;

fig. 8 is a schematic view of a scene provided by an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of another terminal device according to an embodiment of the present invention;

fig. 11 is a display interface of a terminal device according to an embodiment of the present invention;

fig. 12 is another schematic view of a scene provided by an embodiment of the present invention.

Icon: 101-a bluetooth chip; 102-an antenna tuning module; 1021-an adjustable capacitance; 103-audio antenna; 104-a first radio frequency module; 105-an audio module; 90-a terminal device; 901-tone quality control module; 902-a sending module; 903-display module.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

At present, because a flexible circuit board (FPC) antenna and a ceramic antenna in the Bluetooth headset cannot play good antenna radiation performance, the Bluetooth headset can use an audio line as the Bluetooth antenna, so that the normal work of the Bluetooth headset can be ensured, and the signal transmission between the Bluetooth headset and other communication equipment is realized. For example, referring to fig. 1, fig. 1 is a schematic diagram of a neckable bluetooth headset, which includes a main board compartment, a battery compartment, a neckband line, an audio line and a speaker. The main board cabin and the battery cabin are both of metal structures, and under the metal structures, the common FPC antenna and the ceramic antenna cannot play good antenna radiation performance in a metal environment, so that the antenna outside the main board cabin such as an audio line can be used for realizing signal transmission with other communication equipment.

However, using the audio line as a bluetooth antenna has the following disadvantages: the length of the audio line is usually 180 mm-260 mm, and when a user uses the antenna, the receiving area of the audio line is different from that of a human body, so that the impedance of the audio line is not matched with the working frequency band of normal work of the antenna, the return loss (return loss) of the antenna deviates from the return loss value corresponding to the normal frequency band, the performance of the antenna is deteriorated, and at the moment, the phenomena of blocking, distortion or discontinuity and the like can occur in a sound signal transmitted through the audio line.

To facilitate understanding of the above technical problem, please refer to fig. 2, fig. 2 is a graph of return loss versus operating Frequency of an antenna, wherein an abscissa represents operating Frequency (Frequency: GHz), an ordinate represents return loss (dB), S11 represents a return loss curve in a normal operating Frequency band of the antenna, and S22 represents a return loss curve when the antenna operates at a lower Frequency; s22 represents a return loss curve of the antenna operating at a higher frequency.

For the bluetooth headset shown in fig. 1, during the antenna debugging, the return loss parameter debugged by using the head model can perfectly cover the operating frequency band of the bluetooth antenna from 2.4 to 2.484GHz, as shown by the S11 curve in fig. 2, in the operating frequency band from 2.4 to 2.484GHz, see point 1(2.4094, -5.3314) and point 2(2.4843, -5.9542), the return loss is below-4 dB, and the lower the return loss, the better the performance of the antenna. When a user uses the earphone, the audio line is close to the face and the neck, at this time, because the fatness degree of different users is different, the contact area between the neck of the fat user and the antenna is larger, the coverage of the antenna is more, and the return loss (return loss) (S11) of the antenna during normal operation is prone to low frequency offset, as shown by the S22 curve in fig. 2, at this time, in the 2.4-2.484 GHz working frequency band, see points 6(2.4886, -1.1573), the return loss of the antenna is higher and is not below-4 dB. When a thinner person uses the antenna, the contact area with the antenna is smaller, the coverage area of the antenna is smaller, the return loss of the antenna is easy to deviate to high frequency, as shown by the S33 curve in FIG. 2, at this time, in the working frequency band of 2.4-2.484 GHz, the return loss of points 3 (-2.4016, -0.92101) and 4 (-2.4843, -3.4164) is higher and is not lower than-4 dB. In both cases, the performance of the antenna of the bluetooth headset is deteriorated, and the sound signal is blocked, distorted or interrupted.

In order to solve the technical problem, the embodiment of the utility model provides an antenna circuit, this antenna circuit can use in the bluetooth headset who uses the audio line as bluetooth antenna, and its core lies in, adds antenna tuning module in the earphone that uses the audio line as bluetooth antenna, makes the user can realize finely tuning the antenna performance at the in-process that uses, makes bluetooth headset's antenna reach normal condition to improve sound signal and can appear blocking absolutely, distortion or intermittent problem.

In order to understand the working principle of the above-mentioned antenna circuit, please refer to fig. 3, fig. 3 is a schematic structural diagram of an antenna circuit provided in an embodiment of the present invention, wherein the antenna circuit can be applied in a bluetooth headset, and includes a bluetooth chip 101 and an audio antenna 103, and an antenna tuning module 102 is connected between the bluetooth chip 101 and the audio antenna.

The Bluetooth chip 101 is used for acquiring a tone quality adjustment request signal sent by the terminal equipment; the tone quality adjustment request signal includes a target tone quality level; and adjusting the antenna tuning module 102 according to the target tone quality grade so that the return loss of the audio antenna 103 is within a preset return loss range.

In the embodiment of the present invention, the audio antenna 103, besides having the function of transmitting audio signals, can also be used as a bluetooth antenna to interact with the terminal device; after the terminal device sends the tone quality adjustment request signal, the bluetooth headset can receive the bluetooth signal sent by the terminal through the audio antenna. In an actual application scenario, during the antenna debugging using the human head model, a return loss range corresponding to an operating frequency band of the audio antenna may be obtained, for example, the operating frequency band is 2.4-2.484 GHz, and a corresponding preset return loss range is less than-4 dB.

It can be understood that, when a user uses a bluetooth headset, and a sound signal transmitted by the bluetooth headset is stuck, interrupted or distorted, it indicates that the return loss of the antenna of the audio antenna 103 in the current working frequency band exceeds the return loss range corresponding to the working frequency band, at this time, when the user sends a sound quality adjustment request signal through a terminal device, the signal may include a target sound quality level, the bluetooth chip 101 obtains the target level information after obtaining the sound quality adjustment request signal, and adjusts the antenna tuning module 102 according to the sound quality level, so that the return loss of the audio antenna 103 is located in the return loss range corresponding to the working frequency band, and at this time, the problem that the sound signal transmitted by the audio antenna is stuck, interrupted or distorted can be solved.

For example, referring to fig. 2, it is assumed that the operating frequency of the audio antenna is within 2.4-2.484 GHz of the normal operating frequency band, and in this frequency band, when the return loss of the antenna is below-4 dB, the performance of the antenna is better, and it can be ensured that the sound signal transmitted by the audio antenna does not suffer from stutter, discontinuity or distortion. If the bluetooth headset has a sound distortion problem during use, it is indicated that the return loss of the current audio antenna is not lower than-4 dB, for example, the return loss of the antenna is higher than-4 dB in the frequency band range of 2.4-2.484 GHz as shown by the curve S22 or S33 in fig. 2, and at this time, the bluetooth chip 101 reduces the return loss of the antenna to be lower than-4 dB by adjusting the antenna tuning module 102, so that the sound signal transmitted by the audio antenna does not have the phenomena of stutter, discontinuity or distortion.

The embodiment of the utility model provides an antenna circuit, use in bluetooth headset, including bluetooth chip, audio antenna, connect with the antenna tuning module between bluetooth chip and the audio antenna; the Bluetooth chip is used for acquiring a tone quality adjustment request signal sent by the terminal equipment; the tone quality adjustment request signal includes a target tone quality level; adjust antenna tuning module according to target tone quality grade to make audio antenna's return loss in predetermineeing the return loss within range, in the sound signal of audio antenna transmission can not appear the card pause, interrupted or the condition of distortion, the embodiment of the utility model provides an in the back of the bluetooth chip obtains the tone quality grade, can adjust antenna tuning module according to the tone quality grade, make so that audio antenna's return loss returns to predetermineeing the return loss within range, resumes the antenna performance, solved the problem that sound signal appears the card pause, interrupted or the distortion.

Alternatively, as can be seen from fig. 1 and fig. 2, when the user uses the bluetooth headset, the audio antenna is in close coverage with the user, so that the impedance of the audio antenna changes, which affects the return loss of the antenna, and different users have different coverage degrees with the audio line. Therefore, in order to make the return loss of the antenna within the preset return loss range, the return loss can be realized by changing the impedance of the antenna, and a possible implementation manner is given below on the basis of fig. 3. Referring to fig. 4, fig. 4 is a schematic structural diagram of another antenna circuit according to an embodiment of the present invention, that is, the antenna tuning module 102 may include an adjustable capacitor 1021; when the capacitance value of the adjustable capacitor 1021 is a preset capacitance value, the return loss of the audio antenna 103 is within a preset return loss range; the preset capacitance value corresponds to the tone quality grade.

The Bluetooth chip 101 is further configured to determine a preset capacitance value corresponding to the target tone quality level; and adjusting the capacitance value of the adjustable capacitor to be consistent with the preset capacitance value.

The embodiment of the utility model provides an in, when audio antenna because the impedance changes, lead to return loss not when predetermineeing the return loss within range, can carry out impedance compensation through the capacitance value that changes adjustable electric capacity through the capacitance value that adjusts adjustable electric capacity, make return loss return to predetermine the return loss within range. When the capacitance of the adjustable capacitor 1021 is a predetermined capacitance, the return loss of the audio antenna 103 can return to a predetermined return loss range.

It will be appreciated that in a practical application scenario, the preset capacitance value may be obtained during antenna tuning using a model of the head. For example, a return loss range corresponding to an operating frequency band of the audio antenna is obtained, for example, the operating frequency band is 2.4-2.484 GHz, a corresponding preset return loss range is less than-4 dB, and impedance corresponding to the antenna at this time is recorded. And changing the impedance of the antenna to enable the return loss of the antenna to gradually exceed the preset return loss range, adjusting the adjustable capacitor at the moment, and taking the capacitance value of the corresponding adjustable capacitor as a preset capacitance value when the return loss gradually returns to the preset return loss range.

In an embodiment of the present invention, the preset capacitance corresponds to a tone quality level; for example, the preset value of the capacitance of the adjustable capacitor can be 0.3 pF-2.7 pF, or 3.3 pF-5.6 pF, the tone quality level can be divided into eight levels of-1, -2, -3, -4, 1, 2, 3, 4, wherein the preset values of the capacitance corresponding to the levels from-1 to-4 can be 0.3pF, 1.1pF, 1.9pF, 2.7pF, and the capacitance corresponding to the levels from 1 to 4 can be 3.3pF, 4.07pF, 4.84pF, 5.61 pF; after the bluetooth chip obtains the tone quality grade that the terminal sent, can confirm the target capacitance value according to the tone quality grade, when adjusting adjustable capacitor 1021's capacitance value to unanimous with the target capacitance value, can make the return loss of audio antenna 103 return to predetermineeing the return loss within range, solve tone quality card pause, distortion or discontinuous problem.

For example, the user sets up through the terminal and adjusts current tone quality level to 3, and the bluetooth chip obtains the tone quality level and is 3 backs then, according to tone quality level and the corresponding relation between the preset capacitance value, confirms that tone quality level 3 corresponds predetermines the capacitance value and is 4.84pF, can adjust the capacitance value that adjustable capacitor 1021 corresponds to 4.84pF this moment, realizes optimizing current tone quality's purpose.

It should be noted that, the above-mentioned tone quality level and the corresponding preset capacitance value are only used as examples, because the PCB (printedcuittboard) impedance and the used audio cable of different bluetooth headsets are different, the adjustable capacitance value that can be used is different, in the actual application scenario, the subjective feelings of different users to tone quality are different, for example, when part of users adjust the tone quality level to 3, they can feel that tone quality is optimized, when part of users adjust the tone quality level to 3, they still feel that there is the problem of tone quality distortion or stutter, at this moment, users can send tone quality adjusting signal to the bluetooth headset through the terminal device according to their subjective feelings to make the bluetooth headset fine tune tone quality.

Alternatively, the audio antenna 103 can obtain a bluetooth signal sent by the terminal, that is, a sound quality adjustment signal, at this time, since the signal received by the audio antenna 103 belongs to a radio frequency signal, in order to convert a high frequency signal into a signal mode that can be processed by a bluetooth chip, a possible implementation manner is given below on the basis of fig. 4. Referring to fig. 5, fig. 5 is a schematic structural diagram of another antenna circuit according to an embodiment of the present invention, wherein a first rf module 104 is connected between the bluetooth chip 101 and the antenna tuning module 102.

And the audio antenna 103 is configured to receive a sound quality adjustment request signal sent by the terminal, and transmit the sound quality adjustment request signal to the first radio frequency module.

The first rf module 104 is configured to perform signal processing on the obtained sound quality adjustment request signal and transmit the signal to the bluetooth chip 101.

It can be understood that, before the terminal device sends the audio signal to the bluetooth headset, the terminal device modulates the audio signal with low frequency into a high frequency or even radio frequency (RF-radio frequency) signal capable of propagating in the air through a radio frequency module in the terminal device, so that, after the high frequency or even radio frequency signal received by the audio antenna 103, the first radio frequency module 104 in the bluetooth headset processes the high frequency or even radio frequency signal into a low frequency signal capable of being further processed by the bluetooth chip.

Alternatively, in order to implement the function of the bluetooth headset for transmitting audio signals, a possible implementation is given below on the basis of fig. 5. Referring to fig. 6, fig. 6 is a schematic structural diagram of another antenna circuit according to an embodiment of the present invention. Wherein, an audio module 105 is connected between the bluetooth chip 101 and the audio antenna 103; the audio antenna 103 is further used for receiving an audio signal sent by the terminal equipment; and the audio module 105 is used for transmitting the audio signal to a loudspeaker of the Bluetooth headset through an audio antenna.

Optionally, before the terminal device sends the tone quality adjustment signal to the bluetooth headset, the terminal device needs to establish a wireless connection with the bluetooth headset to achieve a function of transmitting a signal between the bluetooth headset and the terminal device, and the audio antenna 103 is further configured to receive a pairing request signal sent by the terminal; the bluetooth chip 101 is further configured to establish a wireless connection with the terminal device according to the pairing request signal.

The embodiment of the utility model provides a still provide a bluetooth headset, this bluetooth headset has contained the antenna circuit that above-mentioned embodiment described. In order to facilitate understanding of the problem that the sound quality signal is jammed, interrupted or distorted by applying the antenna circuit to the bluetooth headset, a connection schematic diagram of the bluetooth headset and the antenna circuit is provided below, and a scene schematic diagram for adjusting the sound quality based on the bluetooth headset and the antenna circuit is also provided.

Referring to fig. 7, fig. 7 is a schematic diagram of a bluetooth headset and an antenna circuit according to an embodiment of the present invention, an audio module 105, a first rf module 104 and an antenna tuning module 102 are connected between a bluetooth chip 101 and an audio antenna 103, wherein the antenna tuning module 102 and the first rf module 104 are connected in series; the audio module 105 is connected in parallel with the antenna tuning module 102 and the first radio frequency module 104.

The audio module 105 includes an audio positive differential output terminal SPKP, an audio negative differential output terminal SPKN, a fourth inductor L4, and a third inductor L3, where the audio positive differential output terminal SPKP and the audio negative differential output terminal SPKN are both connected to the bluetooth chip 101 at one end of the fourth inductor L4, and are connected to the audio negative differential output terminal SPKN, and the other end is connected to the audio antenna 103; one end of the third inductor L3 is connected to the audio negative differential output terminal SPKP, and the other end is connected to the audio antenna 103.

The input end (IN) of the first rf module 104 is connected to the bluetooth chip 101, and the output end (OUT) is connected to the antenna tuning module 102.

The antenna tuning module 102 includes a first inductor L1, a second inductor L2, a first capacitor C1, a third capacitor C3, and an adjustable capacitor C21021. One end of the first inductor L1 is grounded, and the other end is connected to an output end (OUT) of the first rf module; one end of the first capacitor C1 is connected to the input end (OUT) of the first rf module 104, and the other end is connected to one end of the adjustable capacitor C21021 and one end of the second inductor L2; the other end of the adjustable capacitor C21021 is grounded, and the other end of the second inductor L2 is connected with one end of a third capacitor C3; the other end of the third capacitor C3 is connected to one end of a fourth capacitor C4 within the audio antenna 103.

The audio antenna 103 is connected to a speaker of the bluetooth headset, wherein the audio antenna 103 includes a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the fourth inductor L4 in the audio module, and the other end of the fourth capacitor C4 is connected to the third inductor L3 in the audio module and one end of the third capacitor C3 in the antenna tuning module 102.

Based on above-mentioned antenna circuit connection picture, please refer to fig. 8, fig. 8 is the utility model provides a scene schematic diagram, after terminal equipment and bluetooth headset establish wireless connection, convert audio digital signal to audio frequency analog signal, and send with bluetooth signal's form, after bluetooth headset's audio antenna received this bluetooth signal, carry out signal processing back transmission to bluetooth chip through radio frequency module, bluetooth chip gives audio module with audio frequency analog signal transmission, audio module carries out the power to audio frequency analog signal and introduces into in the people's ear through the audio frequency antenna after handling greatly. If this moment user subjective perception tone quality is impaired, and sound signal appears blocking and pausing, distortion or intermittent phenomenon, the user has tone quality regulation demand, can set up the tone quality grade through terminal equipment, terminal equipment generates tone quality regulation bluetooth signal with the tone quality grade that the user set up and sends for bluetooth headset, bluetooth headset's audio antenna receives tone quality regulation bluetooth signal and transmits for the bluetooth chip, the bluetooth chip confirms the capacitance value of adjustable capacitor according to the tone quality grade that contains in the signal, and adjust the current capacitance value of adjustable capacitor into the preset capacitance value that corresponds with the tone quality grade, at this moment, audio antenna is at the in-process of receiving audio signal, the return loss of antenna can keep predetermineeing the return loss within range, the phenomenon that blocking and pausing or distortion can not appear promptly after the received audio signal spreads into the people's ear.

Based on the bluetooth headset that the aforesaid provided, in order to satisfy user's tone quality optimization demand, the utility model also provides a carry out signal interaction's terminal equipment with bluetooth headset, see fig. 9, fig. 9 does the embodiment of the utility model provides a terminal equipment's that provides a schematic diagram. The terminal device 90 comprises a tone quality control module 901 and a sending module 902; the voice quality control module 901 is electrically connected with the sending module 902.

The tone quality control module 901 is used for sending the tone quality adjusting signal to the bluetooth headset through the sending module 902; the tone quality adjusting signal comprises a target tone quality grade; and the target tone quality grade is used for indicating the Bluetooth headset to adjust the return loss of the audio antenna within a preset return loss range. The embodiment of the present invention provides a tone quality control module 901 can be a software module, for example, can be an Application (Application), and the software for playing various audio frequencies inside the terminal device can all pass through the utility model discloses the implementation provides tone quality control module 901 realizes that earphone tone quality adjusts.

Optionally, when a user uses the bluetooth headset and a sound signal in the bluetooth headset has a problem of jamming and the like, the user may generate a tone quality adjusting signal through the terminal device to prompt the bluetooth headset to adjust. Next, a possible implementation manner is given on the basis of fig. 9, referring to fig. 10, and fig. 10 is a schematic structural diagram of another terminal device provided in an embodiment of the present invention. The terminal device further comprises a display module 903; the display module 903 is electrically connected to the sound quality control module 901.

The display module 903 is configured to display the sound quality adjustment level, receive an operation instruction of selecting a target sound quality level by a user, and transmit the operation instruction to the sound quality control module 901.

The embodiment of the utility model provides an in, display module 903 can show tone quality regulation interface, contains different tone quality grades in this tone quality regulation interface, for example, refer to fig. 11, and fig. 11 is the embodiment of the utility model provides a terminal equipment's display interface, wherein include tone quality grade selection region: the voice quality control module 901 can generate voice quality adjusting signals according to the voice quality grade selected by the user and send the voice quality adjusting signals to the Bluetooth headset.

The voice quality control module 901 is further configured to generate a voice quality adjustment request signal according to the operation instruction.

Optionally, in order to implement signal interaction between the terminal device and the bluetooth headset, a second radio frequency module is further connected between the tone quality control module 901 and the sending module; the tone quality control module 901 is used for transmitting the audio signal to the second radio frequency module; and a second rf module, configured to perform signal processing on the received sound quality adjustment signal and transmit the processed signal to the sending module 902. It can be understood that the sound quality adjusting signal at this time is a low-frequency signal, and cannot be propagated in the air, so that the second rf module processes the low-frequency sound quality adjusting signal into a high-frequency or even a radio-frequency signal and transmits the high-frequency or even the radio-frequency signal to the transmitting module 902, so that the transmitting module radiates the sound quality adjusting signal into the air.

Optionally, the sound quality control module 901 is further configured to send a pairing request signal to the bluetooth headset through the sending module; the pairing request signal is used for indicating the Bluetooth headset to establish wireless connection with the terminal equipment.

For the convenience of understanding the process of adjusting tone quality through signal interaction realization between terminal equipment and the bluetooth headset, use terminal equipment as the cell-phone below, tone quality control module is APP, gives a scene schematic diagram, see fig. 12, and fig. 12 is the embodiment of the utility model provides a another kind of scene schematic diagram. It should be noted that, include in the bluetooth headset of follow-up description the utility model provides an antenna circuit, the cell-phone contains the utility model provides a terminal equipment's structure.

Before tone quality adjustment, an APP corresponding to a Bluetooth headset is installed in a mobile phone and is connected and matched with the Bluetooth headset, music is played or voice communication is carried out in the mobile phone, the Bluetooth headset is transmitted through a Bluetooth signal, a user feels tone quality of a sound signal transmitted by the Bluetooth headset, if phenomena of blocking, interruption or distortion and the like occur, the user clicks a tone quality optimization control interface through the APP in the mobile phone to select a target tone quality grade, the APP generates a tone quality adjustment signal according to an operation instruction of the user and transmits the tone quality adjustment signal to the Bluetooth headset, the Bluetooth headset can adjust an adjustable capacitor in an antenna circuit according to the target tone quality grade, so that the echo loss of an audio antenna returns to a preset echo loss range, the difference of the tone quality of the audio signal through an audio line is improved, and due to the existence of the user, after tone quality adjustment is carried out once, the user can select whether to, after the user obtains a satisfactory tone quality signal, the user can click a confirm key of the tone quality optimization control interface to store a required gear, so that the subsequent user experience of the Bluetooth headset is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Claims (10)

1. An antenna circuit is applied to a Bluetooth headset and comprises a Bluetooth chip and an audio antenna; an antenna tuning module is connected between the Bluetooth chip and the audio antenna;

the Bluetooth chip is used for acquiring a tone quality adjustment request signal sent by the terminal equipment; the tone quality adjustment request signal comprises a target tone quality grade; and adjusting the antenna tuning module according to the target tone quality grade so as to enable the return loss of the audio antenna to be within a preset return loss range.

2. The antenna circuit of claim 1, wherein the antenna tuning module comprises an adjustable capacitance; when the capacitance value of the adjustable capacitor is a preset capacitance value, the return loss of the audio antenna is within the preset return loss range; the preset capacitance value corresponds to the tone quality grade;

the Bluetooth chip is also used for determining a preset capacitance value corresponding to the target tone quality grade; and adjusting the capacitance value of the adjustable capacitor to be consistent with the preset capacitance value.

3. The antenna circuit according to claim 1 or 2, wherein a first radio frequency module is connected between the bluetooth chip and the antenna tuning module;

the audio antenna is used for receiving a tone quality adjustment request signal sent by the terminal equipment and transmitting the tone quality adjustment request signal to the first radio frequency module;

and the first radio frequency module is used for transmitting the obtained tone quality adjustment request signal to the Bluetooth chip after signal processing.

4. The antenna circuit of claim 3, wherein an audio module is further connected between the Bluetooth chip and the audio antenna;

the audio antenna is also used for receiving audio signals sent by the terminal equipment;

and the audio module is used for transmitting the audio signal to the loudspeaker of the Bluetooth headset through the audio antenna.

5. The antenna circuit of claim 1,

the audio antenna is further used for receiving a pairing request signal sent by the terminal equipment;

the Bluetooth chip is further used for establishing wireless connection with the terminal equipment according to the pairing request signal.

6. A Bluetooth headset comprising an antenna circuit according to any one of claims 1 to 5.

7. A terminal device is characterized by comprising a tone quality control module and a sending module; the sending module is electrically connected with the tone quality control module;

the tone quality control module is used for sending the tone quality adjusting signal to the Bluetooth headset through the sending module; the tone quality adjusting signal comprises a target tone quality grade; and the target tone quality grade is used for indicating the Bluetooth headset to adjust the return loss of the audio antenna within a preset return loss range.

8. The terminal device of claim 7, further comprising a display module; the display module is electrically connected with the tone quality control module;

the display module is used for displaying the tone quality adjustment grade, receiving an operation instruction of selecting the target tone quality grade by a user, and transmitting the operation instruction to the tone quality control module;

and the tone quality control module is also used for generating the tone quality adjustment request signal according to the operation instruction.

9. The terminal device according to claim 7, wherein a second radio frequency module is further connected between the tone quality control module and the sending module;

the tone quality control module is used for transmitting the tone quality adjusting signal to the second radio frequency module;

and the second radio frequency module is used for transmitting the received tone quality adjusting signal to the sending module after signal processing.

10. The terminal device according to claim 7, wherein the voice quality control module is further configured to send a pairing request signal to the bluetooth headset through the sending module; the pairing request signal is used for indicating the Bluetooth headset to establish wireless connection with the terminal equipment.

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