CN107835045B - Intercom signal processing method and circuit of mobile terminal and mobile terminal - Google Patents
Intercom signal processing method and circuit of mobile terminal and mobile terminal Download PDFInfo
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- CN107835045B CN107835045B CN201711138855.0A CN201711138855A CN107835045B CN 107835045 B CN107835045 B CN 107835045B CN 201711138855 A CN201711138855 A CN 201711138855A CN 107835045 B CN107835045 B CN 107835045B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0825—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with main and with auxiliary or diversity antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
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Abstract
The embodiment of the invention discloses a method and a circuit for processing an intercom signal of a mobile terminal and the mobile terminal. The talkback signal processing method is applied to a mobile terminal provided with a diversity antenna and a talkback antenna, and comprises the following steps: tuning the diversity antenna to an antenna state matched with the talkback frequency band; and obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna, wherein the signal-to-noise ratio of the target talkback signal is greater than that of the talkback signal received by the talkback antenna. In order to increase the transmission distance and expand the talkback range, the embodiment of the invention multiplexes the diversity antenna for receiving the non-talkback signal into the diversity antenna of the talkback antenna to receive the talkback signal, thereby increasing the receiving channel of the talkback signal, further improving the receiving sensitivity of the talkback signal and avoiding the problem caused by the adoption of the mode of increasing the transmitting power of the mobile terminal for sending the talkback signal in the prior art.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and a circuit for processing an intercom signal of a mobile terminal, and a mobile terminal.
Background
With the continuous innovation of communication technology, mobile terminals (such as mobile phones) with talkback function have gained wide attention. The mobile terminal can support both common conversation and talkback functions, so that the mobile terminal has two purposes, improves the practicability of the mobile phone and is increasingly widely applied.
In the prior art, in order to implement the talkback function of the mobile terminal, a scheme of combining application software and the mobile terminal may be adopted. In the scheme, the talkback application is installed in the mobile terminal in advance, when a user needs to use the talkback function, the talkback application is operated, and talkback signals are transmitted through a network so as to realize talkback. However, this solution must rely on a network, and the talk-back function cannot be applied in a non-network environment or a scenario with a high network occupancy rate. Therefore, a second scheme exists at present, in which a talkback receiving circuit and a talkback transmitting circuit are built in a mobile terminal, the talkback receiving circuit is used for receiving talkback signals, the talkback transmitting circuit is used for transmitting talkback signals, and the talkback function of the mobile phone can be realized through the talkback receiving circuit and the talkback transmitting circuit without depending on a network.
However, in the research process of the present application, the inventor finds that when talkbacking through the talkbacking receiving circuit, the talkbacking signal is a radio wave, and the radio wave is easily affected by external obstacles (such as buildings and trees) and the external environment during the propagation process, so that the talkbacking signal is weakened, the path attenuation is caused, the communication quality is reduced, the transmission distance is shortened, and the talkbacking communication range is reduced. At present, in order to solve the problem of reducing the intercom communication range, the general method is to increase the transmission power of the sending end of the intercom signal, but this will cause the power consumption of the mobile terminal sending the intercom signal to increase. The battery capacity of the mobile terminal is usually fixed, and increasing the power consumption of the mobile terminal inevitably reduces the working time of the mobile terminal, and even generates noise waves to interfere the normal operation of other devices (such as a display screen and a camera) in the mobile terminal.
Disclosure of Invention
When talkbacking through receiving circuit and the transmitter of talkbacking among the prior art, in order to solve the problem that the conversation scope of talkbacking reduces, can increase the transmitting power of signal sending terminal of talkbacking, but this can lead to sending the mobile terminal's of talkbacking consumption to increase, thereby reduce mobile terminal's operating duration, produce the clutter even, influence the normal work of other equipment among the mobile terminal. In order to solve the problem in the prior art, the embodiment of the invention discloses an intercom signal processing method and circuit of a mobile terminal and the mobile terminal.
In a first aspect of the present invention, a method for processing an intercom signal of a mobile terminal is disclosed, wherein the mobile terminal is provided with an intercom antenna and a diversity antenna for receiving a non-intercom signal, and the method for processing the intercom signal comprises:
tuning the diversity antenna to an antenna state matched with the talkback frequency band;
and obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna, wherein the signal-to-noise ratio of the target talkback signal is greater than that of the talkback signal received by the talkback antenna.
Optionally, the step of tuning the diversity antenna to an antenna state matched with an intercom frequency band specifically includes:
and if the strength of the signal received by the main set antenna in the mobile terminal is greater than a preset threshold value, tuning the diversity antenna to an antenna state matched with the talkback frequency band.
Optionally, the step of obtaining a target intercom signal according to the intercom signal received by the diversity antenna and the intercom signal received by the intercom antenna specifically includes:
and synthesizing the talkback signals received by the diversity antenna and the talkback signals received by the talkback antenna by utilizing a maximum ratio combining mode to obtain the target talkback signals.
Optionally, the step of obtaining a target intercom signal according to the intercom signal received by the diversity antenna and the intercom signal received by the intercom antenna specifically includes:
and if the signal-to-noise ratio of the talkback signal received by the diversity antenna is greater than the signal-to-noise ratio of the talkback signal received by the talkback antenna, taking the talkback signal received by the diversity antenna as a target talkback signal.
In a second aspect of the present invention, a mobile terminal is disclosed, provided with a talkback antenna and a diversity antenna for receiving a non-talkback signal, the mobile terminal comprising a memory and a processor;
the memory is used for storing a computer program;
the processor is adapted to execute the computer program to implement the method according to the first aspect.
In a third aspect of the present invention, an intercom signal processing circuit of a mobile terminal is disclosed, wherein the mobile terminal is provided with an intercom antenna and a diversity antenna for receiving a non-intercom signal, and the intercom signal processing circuit comprises an antenna tuner and a signal processor;
the diversity antenna is connected with the signal processor through the antenna tuner, and the talkback antenna is connected with the signal processor;
the antenna tuner is used for tuning the diversity antenna to an antenna state matched with the talkback frequency band;
the signal processor is used for obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna, wherein the signal-to-noise ratio of the target talkback signal is greater than the signal-to-noise ratio of the talkback signal received by the talkback antenna.
Optionally, the talkback signal processing circuit further includes a controller, a switch circuit and a first radio frequency receiver, the switch circuit is connected in series between the diversity antenna and the first radio frequency receiver, and the first radio frequency receiver is configured to process a non-talkback signal received by the diversity antenna;
when the strength of the non-intercom signal received by the main set antenna in the mobile terminal is larger than a preset threshold value, the controller is used for controlling the switch circuit to be switched off and enabling the antenna tuner;
otherwise, the controller is used for controlling the switch circuit to be conducted and forbidding the antenna tuner.
Optionally, the signal processor is specifically configured to synthesize the intercom signal received by the diversity antenna and the intercom signal received by the intercom antenna in a maximum ratio combining manner, so as to obtain a target intercom signal.
Optionally, the signal processor is specifically configured to use the intercom signal received by the diversity antenna as the target intercom signal when the signal-to-noise ratio of the intercom signal received by the diversity antenna is greater than the signal-to-noise ratio of the intercom signal received by the intercom antenna.
In a fourth aspect of the present invention, a mobile terminal is disclosed, provided with a talkback antenna and a diversity antenna for receiving a non-talkback signal, the mobile terminal comprising a talkback signal processing circuit as described in the third aspect of the present invention.
Compared with the prior art that only one path of talkback signal can be received through the talkback antenna, the embodiment of the invention can receive two paths of talkback signals, and particularly, one path of talkback signal is received through the talkback antenna, and the existing diversity antenna for receiving the non-talkback signal in the mobile terminal is tuned to the antenna state matched with the talkback frequency band, so that the diversity antenna receives the other path of talkback signal. The two paths of talkback signals received by different antennas are not correlated, and the embodiment of the invention utilizes the two paths of uncorrelated talkback signals to obtain the target talkback signal with a signal-to-noise ratio higher than that of the talkback signal received by the talkback antenna in the prior art.
Since the signal-to-noise ratio of the signal is in positive correlation with the receiving sensitivity, that is, the larger the signal-to-noise ratio of the signal is, the higher the receiving sensitivity of the signal is, compared with the receiving sensitivity of the intercom signal received by the intercom antenna in the prior art, the receiving sensitivity of the target intercom signal of the embodiment of the invention is improved, and the improvement of the receiving sensitivity of the signal can enable the mobile terminal to have the capability of capturing the weak signal more strongly, so that the received intercom signal becomes weak with the increase of the transmission distance, the mobile terminal with high sensitivity can still receive the intercom signal, the stable connection is maintained, the transmission distance is greatly improved, and the intercom communication range is expanded. Therefore, in order to increase the transmission distance and expand the talkback range, the embodiment of the invention multiplexes the diversity antenna for receiving the non-talkback signal into the diversity antenna of the talkback antenna to receive the talkback signal, thereby increasing the receiving path of the talkback signal, further improving the receiving sensitivity of the talkback signal, and avoiding the problems caused by increasing the transmitting power of the mobile terminal for sending the talkback signal in the prior art, such as the increase of the power consumption of the mobile terminal, the generation of noise waves interfering other devices, and the like.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a flowchart of an intercom signal processing method of a mobile terminal according to an embodiment of the present invention;
fig. 2 is a flowchart of another talkback signal processing method of a mobile terminal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an intercom signal processing circuit of a mobile terminal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an intercom signal processing circuit of another mobile terminal disclosed in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of an antenna tuner according to an embodiment of the disclosure;
fig. 6 is a schematic structural diagram of a talkback signal processing circuit of another mobile terminal according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a signal processor in an intercom signal processing circuit of a mobile terminal according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a mixer in a mixer-shared intercom transmitter in a second mixing module according to an embodiment of the present invention.
Detailed Description
When talkbacking through receiving circuit and the transmitter of talkbacking among the prior art, in order to solve the problem that the conversation scope of talkbacking reduces, can increase the transmitting power of signal sending terminal of talkbacking, but this can lead to sending the mobile terminal's of talkbacking consumption to increase, thereby reduce mobile terminal's operating duration, produce the clutter even, influence the normal work of other equipment among the mobile terminal. In order to solve the problem in the prior art, the embodiment of the invention discloses an intercom signal processing method and circuit of a mobile terminal and the mobile terminal.
The first embodiment of the invention discloses an intercom signal processing method of a mobile terminal, wherein an intercom antenna and a diversity antenna for receiving non-intercom signals are arranged in the mobile terminal. In the mobile terminal in the prior art, the main set antenna is generally used for transmitting and receiving non-intercom signals, and the diversity antenna is generally used for receiving the non-intercom signals, so as to assist the operation of the main set antenna and reduce the influence of fast fading on the non-intercom signals received by the main set antenna. The non-intercom signal may specifically be a cellular signal, such as a 2G signal, a 3G signal, or a 4G signal, and may also be a GPS signal or a WIFI signal.
Referring to the schematic workflow diagram shown in fig. 1, the intercom signal processing method includes the following steps:
and step S11, tuning the diversity antenna to an antenna state matched with the talkback frequency band.
It will be appreciated that the intercom antenna and the diversity antenna for receiving the non-intercom signal each operate in different frequency bands. For example, in a cellular phone, the operating band of a diversity antenna is typically 700MHz-2.6GHz, while the operating band of a talk-back antenna is typically 300MHz-800 MHz. The talkback frequency band in this embodiment may be 300MHz to 800 MHz.
In the embodiment of the present invention, in step S11, the diversity antenna is tuned to the working state matched with the intercom frequency band, so that the diversity antenna does not assist the main set antenna to work, but is used for receiving the intercom signal.
And step S12, obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna. The signal-to-noise ratio of the target talkback signal is greater than that of the talkback signal received by the talkback antenna.
In this embodiment, the two paths of intercom signals received by the intercom antenna and the diversity antenna are not correlated with each other, and step S12 obtains a target intercom signal with a higher signal-to-noise ratio than the intercom signal received by the intercom antenna in the prior art by using the two paths of uncorrelated intercom signals.
In the prior art, the formula is followed between the receiving sensitivity and the signal-to-noise ratio: s ═ 10lg (KTB) + NF + SNR, where S is the receive sensitivity, KTB represents the thermal noise power over the bandwidth, NF represents the noise figure, and SNR represents the signal-to-noise ratio. The signal-to-noise ratio of the signal is in positive correlation with the receiving sensitivity, namely, the larger the signal-to-noise ratio of the signal is, the higher the receiving sensitivity of the signal is, so that compared with the receiving sensitivity of the talkback signal received by the talkback antenna in the prior art, the receiving sensitivity of the target talkback signal of the embodiment of the invention is improved, and the improvement of the receiving sensitivity of the signal can enable the mobile terminal to have the capability of capturing weak signals more strongly, so that along with the increase of the transmission distance, the received signal becomes weak, the mobile terminal with high sensitivity can still receive the talkback signal, the stable connection is maintained, the transmission distance is greatly improved, and the talkback communication range is. Compared with the prior art that the transmitting power of the mobile terminal sending the talkback signals is increased, the diversity antenna receiving the non-talkback signals is multiplexed into the diversity antenna of the talkback antenna, so that the talkback signals are received by the diversity antenna, the receiving channel of the talkback signals is increased, the receiving sensitivity of the talkback signals is further improved, and the purposes of increasing the transmission distance and expanding the talkback communication range are achieved.
In an optional implementation manner, when the strength of the non-intercom signal received by the main set antenna in the mobile terminal is greater than a preset threshold, the diversity antenna is tuned to an antenna state matched with an intercom frequency band. In this embodiment, if it is determined that the strength of the non-intercom signal received by the main set antenna is greater than the preset threshold, it is determined that the non-intercom signal received by the main set antenna is stronger, and the non-intercom signal is received by the main set antenna itself, and the diversity antenna is not required to assist the main set antenna to operate.
Specifically, referring to fig. 2, the present embodiment includes the following steps:
and step S21, obtaining the strength of the non-talkback signal received by the main set antenna in the mobile terminal.
The strength of the non-intercom signal received by the main set antenna in the mobile terminal can be generally represented by various forms of signal strength parameters. For example, the Signal strength parameter may be RSCP (Received Signal Code Power) and/or a carrier-to-noise ratio C/N0, and of course, the strength of the non-intercom Signal Received by the main set antenna may also be determined by using other types of Signal strength parameters, which is not limited in this embodiment of the present invention.
And step S22, judging whether the intensity of the non-intercom signal received by the main set antenna in the mobile terminal is greater than a preset threshold value, if so, executing the operation of step S23, and if not, executing the operation of step S25.
And step S23, tuning the diversity antenna to an antenna state matched with the talkback frequency band.
And step S24, obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna. The signal-to-noise ratio of the target talkback signal is greater than that of the talkback signal received by the talkback antenna.
Step S25, the antenna state of the diversity antenna is kept unchanged.
If the intensity of the non-intercom signal received by the main set antenna in the mobile terminal is less than or equal to the preset threshold value, it is indicated that the intensity of the non-intercom signal received by the main set antenna is poor, the diversity antenna is required to receive the non-intercom signal to assist the main set antenna to work, and under the condition, the antenna state of the diversity antenna is kept unchanged.
In the step S12 or S24, the step of obtaining the target intercom signal according to the intercom signal received by the diversity antenna and the intercom signal received by the intercom antenna may be implemented in various ways, so that the signal-to-noise ratio of the obtained target intercom signal is greater than the signal-to-noise ratio of the intercom signal received by the intercom antenna.
In an alternative embodiment, the talkback signals received by the diversity antenna and the talkback signals received by the talkback antenna are synthesized by using a maximum ratio combining mode to obtain the target talkback signal. The Maximum RATIO Combining (MRC) refers to in-phase weighted combining of multiple SIGNALs, the weight is determined by the RATIO of the SIGNAL power and the NOISE power corresponding to each branch SIGNAL, and the SIGNAL-to-NOISE RATIO (SNR) of the maximum RATIO combining is equal to the sum of the SIGNAL-to-NOISE RATIOs of the branches. In this embodiment, the signal-to-noise ratio of the target intercom signal is equal to the sum of the signal-to-noise ratio of the intercom signal received by the diversity antenna and the signal-to-noise ratio of the intercom signal received by the intercom antenna.
In another optional embodiment, if the signal-to-noise ratio of the intercom signal received by the diversity antenna is greater than the signal-to-noise ratio of the intercom signal received by the intercom antenna, the intercom signal received by the diversity antenna is used as the target intercom signal. In this embodiment, if the snr of the intercom signal received by the diversity antenna is greater than the snr of the intercom signal received by the intercom antenna, the intercom signal received by the intercom antenna is discarded, but the intercom signal received by the diversity antenna is directly used as the target intercom signal,
correspondingly, in another embodiment of the invention, a mobile terminal is disclosed. The mobile terminal is provided with a talkback antenna and a diversity antenna for receiving non-talkback signals, and includes a memory and a processor.
Wherein the memory is for storing a computer program.
The processor is configured to execute the computer program to implement the intercom signal processing method disclosed in each of the above embodiments of the present invention.
The invention discloses a talkback signal processing circuit of a mobile terminal, wherein the mobile terminal is provided with a talkback antenna and a diversity antenna for receiving non-talkback signals. Referring to the schematic configuration shown in fig. 3, the intercom signal processing circuit includes an antenna tuner 100 and a signal processor 200. The diversity antenna is connected to the signal processor 200 through the antenna tuner 100, and the intercom antenna is connected to the signal processor 200.
The antenna tuner 100 is used to tune the diversity antenna to an antenna state that matches the intercom frequency band.
The signal processor 200 is configured to obtain a target intercom signal according to the intercom signal received by the diversity antenna and the intercom signal received by the intercom antenna. The signal-to-noise ratio of the target talkback signal is greater than that of the talkback signal received by the talkback antenna.
In an alternative embodiment, referring to the schematic structural diagram shown in fig. 4, the talkback signal processing circuit further includes a controller 210, a switch circuit 220, and a first radio frequency receiver 230, where the switch circuit 220 is connected in series between the diversity antenna and the first radio frequency receiver 230, and the first radio frequency receiver is configured to process a non-talkback signal received by the diversity antenna.
When the strength of the non-intercom signal received by the main set antenna in the mobile terminal is greater than the instruction of the preset threshold, the controller 210 is configured to control the switch circuit 220 to be turned off and enable the antenna tuner 100. At this time, the antenna tuner 100 is in an enabled state, and can tune the diversity antenna to an antenna state matched with the talkback frequency band, that is, the diversity antenna is used to receive talkback signals at this time, in fig. 4, a path between the diversity antenna and the first radio frequency receiver 230 is in an off state, and the signal processor 200 is used to receive the talkback signals received by the diversity antenna and the talkback signals received by the talkback antenna, and obtain the target talkback signals according to the two talkback signals.
When the strength of the non-intercom signal received by the main set antenna in the mobile terminal is less than or equal to the instruction of the preset threshold, the controller 210 is configured to control the switch circuit 220 to be turned on, and disable the antenna tuner 100. At this time, the antenna tuner 100 is in the disabled state, the antenna state of the diversity antenna is maintained unchanged, and is used to assist the main set antenna to receive the non-intercom signal, in fig. 4, the path between the diversity antenna and the first radio frequency receiver 230 is in the conducting state, and the first radio frequency receiver is used to process the non-intercom signal received by the diversity antenna.
In an alternative embodiment, referring to the schematic structural diagram shown in fig. 5, the antenna tuner 100 includes a switch S1, and an adjustable capacitor C and an adjustable inductor L. In this embodiment, the antenna tuner 100 may be enabled by controlling the switch S1 to be turned on, and the antenna tuner 100 may be disabled by controlling the switch S1 to be turned off. The values of the adjustable capacitor C and the adjustable inductor L are specifically adjusted according to the intercom frequency band and the working frequency band of the diversity antenna, that is, the adjusted adjustable capacitor C and the adjusted adjustable inductor L can tune the diversity antenna to an antenna state matched with the intercom frequency band.
The antenna tuner 100 may have other embodiments than the one shown in fig. 5 as long as the diversity antenna can be tuned to the antenna state matching the intercom frequency band, for example, the switch S1 may be connected in series with an adjustable inductor, the adjustable inductor L in fig. 5 may be replaced by an inductor having a fixed inductance value, and the adjustable capacitor C may be replaced by a capacitor having a fixed capacitance value.
In an alternative embodiment, referring to the schematic structural diagram shown in fig. 6, the signal processor 200 includes a second rf receiver 240, a third rf receiver 250, and an output unit 260.
The second rf receiver 240 is configured to process an intercom signal received by the diversity antenna, the third rf receiver 250 is configured to process the intercom signal received by the intercom antenna, and the output unit 260 is configured to obtain a target intercom signal according to the processed intercom signal received by the intercom antenna and the processed intercom signal received by the diversity antenna. The signal-to-noise ratio of the target talkback signal is greater than that of the talkback signal received by the talkback antenna.
Further, in an embodiment of the present invention, the second rf receiver generally includes: the second radio frequency low noise amplifier, a second filter connected with the second radio frequency low noise amplifier, a second frequency mixing module connected with the second filter, and a second intermediate frequency low noise amplifier connected with the second frequency mixing module.
The second radio frequency low noise amplifier is used for receiving the talkback signal transmitted by the diversity antenna and amplifying the received talkback signal to obtain an amplified talkback signal, wherein the amplified talkback signal is usually a high-frequency talkback signal. And after receiving the amplified talkback signal, the second filter performs filtering processing on the amplified talkback signal to filter out interference signals except the talkback signal, and then transmits the filtered talkback signal to the second frequency mixing module. And after receiving the filtered talkback signal, the second frequency mixing module performs frequency mixing processing on the filtered talkback signal to obtain a frequency-mixed talkback signal, wherein the frequency-mixed talkback signal is usually an intermediate-frequency talkback signal. And the first intermediate frequency low noise amplifier amplifies the talkback signal after receiving the frequency mixing processing to obtain an amplified talkback signal, and then transmits the amplified talkback signal to the output unit.
Accordingly, the third radio frequency receiver comprises: the first intermediate frequency low noise amplifier is connected with the first frequency mixing module.
The third radio frequency low noise amplifier is used for receiving the talkback signal transmitted by the talkback antenna, and after receiving the talkback signal transmitted by the talkback antenna, the third radio frequency low noise amplifier amplifies the talkback signal to obtain an amplified talkback signal, wherein the amplified talkback signal is usually a high-frequency talkback signal. And after receiving the amplified talkback signal, the third filter performs filtering processing on the amplified talkback signal to filter out interference signals except the talkback signal, and then transmits the filtered talkback signal to the third frequency mixing module. And after receiving the filtered talkback signal, the third frequency mixing module performs frequency mixing processing on the filtered talkback signal to obtain a frequency-mixed talkback signal, wherein the frequency-mixed talkback signal is usually an intermediate-frequency talkback signal. And the third intermediate frequency low noise amplifier amplifies the talkback signal after receiving the frequency mixing processing to obtain an amplified talkback signal, and then transmits the amplified talkback signal to the output unit.
In the embodiment of the present invention, the second frequency mixing module and the third frequency mixing module may be two independent frequency mixing modules. In this case, the second mixing module includes: a second mixer, a second voltage controlled oscillator, and a second frequency synthesizer. The second mixer is connected with a second voltage-controlled oscillator; a second voltage-controlled oscillator and a second frequency synthesizer form a closed loop, and a second local oscillator signal is output to a second frequency mixer through the second voltage-controlled oscillator; and after receiving the filtering signal and the second local oscillator signal output by the second filter, the second frequency mixer performs frequency mixing processing on the filtering signal and the second local oscillator signal to obtain an intermediate-frequency talkback signal, and then transmits the intermediate-frequency talkback signal to a second intermediate-frequency low-noise amplifier.
Correspondingly, the third mixing module comprises: a third mixer, a third voltage controlled oscillator and a third frequency synthesizer. The third mixer is connected with a third voltage-controlled oscillator; a third voltage-controlled oscillator and a third frequency synthesizer form a closed loop, and a third local oscillator signal is output to a third mixer through the third voltage-controlled oscillator; and after receiving the filtering signal and the third local oscillator signal output by the third filter, the third mixer performs frequency mixing processing on the filtering signal and the third local oscillator signal to obtain an intermediate-frequency talkback signal, and then transmits the intermediate-frequency talkback signal to a third intermediate-frequency low-noise amplifier.
Further, in order to save circuit devices, the voltage controlled oscillator and the frequency synthesizer in the second and third mixer modules may be shared. In this case, referring to the schematic diagram of the structure shown in fig. 7, the third rf receiver in fig. 7 includes: a third rf lna 251, a third filter 252, a third mixing module, and a third if lna 254.
Accordingly, the second radio frequency receiver comprises: a second radio frequency low noise amplifier 241, a second filter 242, a second mixing module, and a second intermediate frequency low noise amplifier 244.
In addition, the third mixing module includes: a third mixer 253, a third voltage controlled oscillator 255 and a third frequency synthesizer 256. The second mixing module comprises: a second mixer 243.
The third mixer 253 and the fourth mixer 243 are both connected to a third voltage controlled oscillator 255. A closed loop is formed between the third voltage controlled oscillator 255 and the third frequency synthesizer 256.
When the third frequency synthesizer 256 receives the first level signal, the third frequency synthesizer 256 controls the third voltage controlled oscillator 255 to output a third local oscillation signal to the third mixer 253 and output a second local oscillation signal to the second mixer 243; after receiving the filtered signal and the third local oscillator signal output by the third filter, the third mixer 253 performs frequency mixing processing on the filtered signal and the third local oscillator signal to obtain an intermediate-frequency intercom signal, and then transmits the intermediate-frequency intercom signal to the third intermediate-frequency low-noise amplifier 254; the second mixer 243 receives the filtered signal and the second local oscillator signal output by the second filter, performs frequency mixing processing on the filtered signal and the second local oscillator signal to obtain an intermediate-frequency intercom signal, and then transmits the intermediate-frequency intercom signal to the second intermediate-frequency low-noise amplifier 244.
In addition, a chip built in the mobile terminal can control the third frequency synthesizer to which signals of different levels are input.
Furthermore, an intercom transmitter is further arranged in the mobile terminal and used for transmitting an intercom signal. The talkback mode is usually a receiving and transmitting common-frequency half-duplex mode, that is, only talkback signals can be received or only talkback signals can be transmitted within the same time, and the two modes can not be performed simultaneously. That is, the mixer in the intercom transmitter does not operate when receiving the intercom signal. In this case, the second RF receiver may share the mixer in the intercom transmitter
When the mixer in the second mixing module in the second radio frequency receiver shares the mixer in the talkback transmitter, the second radio frequency receiver further comprises: a first path selection circuit and a second path selection circuit. The connection structure of the first path selection circuit 300 and the second path selection circuit 400 with other devices is shown in fig. 8, the second rf receiver shares the fourth mixer 300 in the intercom transmitter, and when receiving an intercom signal, the second filter, the first path selection circuit, the fourth mixer, the second path selection circuit, and the second if lna can form a path by controlling the directions of the first path selection circuit and the second path selection circuit.
In the second radio frequency receiver of the embodiment, the mixer in the second mixing module and the mixer in the intercom transmitter are shared, so that circuit devices are saved, and occupation of the internal space of the mobile terminal is reduced.
In another embodiment of the present invention, a mobile terminal is further disclosed, wherein the mobile terminal is provided with an intercom antenna and a diversity antenna for receiving non-intercom signals. Moreover, the mobile terminal comprises the talkback signal processing circuit disclosed in the embodiment of the invention.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. Especially, for the … … embodiment, since it is basically similar to the method embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (6)
1. A talkback signal processing method of a mobile terminal is provided, wherein the mobile terminal is provided with a talkback antenna and a diversity antenna for receiving non-talkback signals, and the talkback signal processing method comprises the following steps:
tuning the diversity antenna to an antenna state matched with the talkback frequency band;
obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna, wherein the signal-to-noise ratio of the target talkback signal is greater than the signal-to-noise ratio of the talkback signal received by the talkback antenna;
the step of obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna specifically includes:
synthesizing the talkback signals received by the diversity antenna and the talkback signals received by the talkback antenna by utilizing a maximum ratio combining mode to obtain target talkback signals;
the synthesizing the talkback signals received by the diversity antenna and the talkback signals received by the talkback antenna in a maximum ratio combining mode to obtain the target talkback signals includes:
determining a first weight by using the ratio of the signal power and the noise power of the talkback signals received by the diversity antenna;
determining a second weight by utilizing the ratio of the signal power and the noise power of the talkback signal received by the talkback antenna;
and carrying out in-phase weighting and combination on the talkback signals received by the diversity antenna and the talkback signals received by the talkback antenna according to the first weight and the second weight to obtain the target talkback signals.
2. The intercom signal processing method according to claim 1, wherein the step of tuning the diversity antenna to an antenna state matched with an intercom frequency band specifically comprises:
and if the intensity of the non-talkback signal received by the main set antenna in the mobile terminal is greater than a preset threshold value, tuning the diversity antenna to an antenna state matched with the talkback frequency band.
3. A mobile terminal is provided with an intercom antenna and a diversity antenna for receiving non-intercom signals, and is characterized by comprising a memory and a processor;
the memory is used for storing a computer program;
the processor is adapted to execute the computer program to implement the method of claim 1 or 2.
4. A talkback signal processing circuit of a mobile terminal is provided with a talkback antenna and a diversity antenna for receiving non-talkback signals, and is characterized in that the talkback signal processing circuit comprises an antenna tuner and a signal processor;
the diversity antenna is connected with the signal processor through the antenna tuner, and the talkback antenna is connected with the signal processor;
the antenna tuner is used for tuning the diversity antenna to an antenna state matched with the talkback frequency band;
the signal processor is used for obtaining a target talkback signal according to the talkback signal received by the diversity antenna and the talkback signal received by the talkback antenna, wherein the signal-to-noise ratio of the target talkback signal is greater than that of the talkback signal received by the talkback antenna;
the signal processor is specifically configured to synthesize the intercom signal received by the diversity antenna and the intercom signal received by the intercom antenna in a maximum ratio combining manner to obtain a target intercom signal;
the signal processor is specifically configured to determine a first weight by using a ratio of signal power to noise power of the intercom signal received by the diversity antenna; determining a second weight by utilizing the ratio of the signal power and the noise power of the talkback signal received by the talkback antenna; and carrying out in-phase weighting and combination on the talkback signals received by the diversity antenna and the talkback signals received by the talkback antenna according to the first weight and the second weight to obtain the target talkback signals.
5. The intercom signal processing circuit according to claim 4, further comprising a controller, a switching circuit, and a first radio frequency receiver, wherein the switching circuit is connected in series between the diversity antenna and the first radio frequency receiver, and the first radio frequency receiver is configured to process the non-intercom signal received by the diversity antenna;
when the strength of the non-intercom signal received by the main set antenna in the mobile terminal is larger than a preset threshold value, the controller is used for controlling the switch circuit to be switched off and enabling the antenna tuner;
otherwise, the controller is used for controlling the switch circuit to be conducted and forbidding the antenna tuner.
6. A mobile terminal provided with a talkback antenna and a diversity antenna for receiving non-talkback signals, characterized in that the mobile terminal comprises a talkback signal processing circuit as claimed in claim 4 or 5.
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| CN110299930B (en) * | 2019-06-25 | 2021-07-13 | Oppo广东移动通信有限公司 | Antenna switching method and related equipment |
| CN110311704B (en) * | 2019-06-25 | 2021-04-13 | Oppo广东移动通信有限公司 | Antenna switching method and related product |
| CN111211817A (en) * | 2019-12-20 | 2020-05-29 | 青岛海信移动通信技术股份有限公司 | Mobile terminal device and multi-antenna debugging method |
| CN111294704B (en) * | 2020-01-22 | 2021-08-31 | 北京小米松果电子有限公司 | Audio processing method, device and storage medium |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |