CN113271274B - Method and device for judging continuous frequency modulation signal and non-continuous frequency modulation signal and terminal - Google Patents
Method and device for judging continuous frequency modulation signal and non-continuous frequency modulation signal and terminal Download PDFInfo
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- CN113271274B CN113271274B CN202110546864.3A CN202110546864A CN113271274B CN 113271274 B CN113271274 B CN 113271274B CN 202110546864 A CN202110546864 A CN 202110546864A CN 113271274 B CN113271274 B CN 113271274B
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Abstract
A method, a device and a terminal for judging continuous frequency modulation signals and non-continuous frequency modulation signals are provided, wherein the method comprises the following steps: receiving a frequency modulation signal of a first unit duration; determining the number of frequency deviation exceeding points of the frequency modulation signal of the first unit duration; if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, receiving the frequency modulation signal of the second unit duration and judging whether the number of the frequency deviation exceeding points is smaller than the preset threshold or not until the frequency modulation signal of the second unit duration with the number of the frequency deviation exceeding points larger than or equal to the preset threshold occurs or the receiving frequency of the frequency modulation signal of the second unit duration reaches a preset receiving frequency; and if the frequency deviation exceeding point number of the frequency modulation signal with the second unit duration is larger than or equal to the frequency modulation signal with the preset threshold, judging that the frequency modulation signal is a discontinuous frequency modulation signal. The invention optimizes analog and digital dual-mode technology.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method, a device and a terminal for judging continuous frequency modulation signals and discontinuous frequency modulation signals.
Background
The existing trunking intercom communication interphone adopts Frequency Modulation modes including a traditional analog Frequency Modulation (FM) mode and a Digital Frequency Shift Keying (FSK) mode, is generally used for short data or voice communication, and in the current market, most of the interphones adopt analog of the traditional FM Modulation, a small part of the interphones adopt Digital FSK Modulation of a Digital Mobile Radio (DMR) mode, most of the Digital interphones are analog-Digital dual-mode, but all the interphones need to be Digital or analog in a preset receiving mode, and cannot receive analog signals in the preset Digital mode or Digital signals in the preset analog mode.
In the existing technical scheme, in order to realize digital and analog dual-mode reception, hardware manufacturing cost and complexity are often increased, or the problems of large delay and word and sentence loss in severe cases are caused.
There is a need for a method for determining continuous frequency modulation signals and discontinuous frequency modulation signals, which can reliably and quickly identify whether the frequency modulation signal is in an FM system or in a DMR FSK system, so as to optimize analog and digital dual-mode technologies.
Disclosure of Invention
The invention aims to provide a method, a device and a terminal for judging continuous frequency modulation signals and discontinuous frequency modulation signals, which can quickly and accurately judge whether received signals are continuous frequency modulation signals or discontinuous frequency modulation signals, thereby optimizing analog and digital dual-mode technology.
In order to solve the above technical problem, an embodiment of the present invention provides a method for determining a continuous frequency modulation signal and a discontinuous frequency modulation signal, including: receiving a frequency modulation signal of a first unit time length; determining the number of frequency deviation exceeding points of the frequency modulation signal of the first unit time length, wherein the frequency deviation exceeding points are points of which the frequency deviation is greater than a preset frequency deviation threshold value in the frequency modulation signal of the first unit time length; if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, receiving the frequency modulation signal of the second unit duration and judging whether the number of the frequency deviation exceeding points is smaller than the preset threshold or not until the frequency modulation signal of the second unit duration is greater than or equal to the preset threshold or the receiving frequency of the frequency modulation signal of the second unit duration reaches the preset receiving frequency, wherein the preset threshold is the number of the frequency deviation exceeding points predetermined based on the discontinuous frequency modulation signal; if the frequency deviation exceeding point number of the frequency modulation signal with the second unit duration is larger than or equal to the frequency modulation signal with the preset threshold, judging that the frequency modulation signal is a discontinuous frequency modulation signal; if the receiving times of the frequency modulation signals of the second unit duration reach the preset receiving times and the number of the frequency deviation limit points of the frequency modulation signals of each second unit duration is smaller than the preset threshold value, judging that the frequency modulation signals are continuous frequency modulation signals; the discontinuous frequency modulation signal is of a multi-slot frame structure, and the signal is transmitted on only a part of the slots in the multiple slots.
Optionally, each frame duration of the discontinuous frequency modulation signal is divided into a transmission duration of a transmission signal and an idle duration of a non-transmission signal; the first unit duration is less than a smaller duration; and/or the second unit duration is less than the smaller duration; wherein the smaller duration is the smaller value of the sending duration and the idle duration.
Optionally, the total duration of the second unit durations of the preset receiving times is greater than the sending duration, and the preset receiving times is the minimum.
Optionally, the preset frequency offset threshold is determined according to a maximum modulation frequency offset of the frequency modulation signal.
Optionally, the preset frequency offset threshold is selected from 1.5 times to 3 times of a maximum modulation frequency offset of the frequency modulation signal.
Optionally, the continuous frequency modulation signal is an analog FM signal, and the discontinuous frequency modulation signal is a DMR digital signal.
Optionally, before receiving the frequency modulation signal of the second unit duration and determining whether the number of the frequency offset exceeding points is smaller than the preset threshold, the determining method further includes: if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is larger than or equal to a preset threshold, performing dormancy in a preset dormancy duration, then continuously receiving the frequency modulation signal of the first unit duration and judging whether the number of the frequency deviation exceeding points is smaller than the preset threshold.
To solve the above technical problem, an embodiment of the present invention provides a device for determining a continuous frequency modulation signal and a discontinuous frequency modulation signal, including: the receiving module is used for receiving the frequency modulation signal of the first unit duration; a quantity determining module, configured to determine the quantity of frequency offset exceeding points of the frequency modulation signal of the first unit duration, where the frequency offset exceeding points are points where frequency offset in the frequency modulation signal of the first unit duration is greater than a preset frequency offset threshold; a comparison module, configured to receive the frequency modulation signal of the second unit duration and determine whether the number of frequency offset exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, until the number of frequency offset exceeding points of the frequency modulation signal of the second unit duration is greater than or equal to the preset threshold or the number of times of receiving the frequency modulation signal of the second unit duration reaches a preset number of times of reception, when the number of frequency offset exceeding points of the frequency modulation signal of the first unit duration is smaller than the preset threshold, where the preset threshold is a number of frequency offset exceeding points predetermined based on the discontinuous frequency modulation signal; the continuous signal judgment module is used for judging that the frequency modulation signal is a discontinuous frequency modulation signal when the frequency deviation limit point number of the frequency modulation signal with the second unit duration is greater than or equal to the frequency modulation signal with the preset threshold value; the discontinuous signal judgment module is used for judging that the frequency modulation signal is a continuous frequency modulation signal when the receiving times reach the preset receiving times and the number of frequency deviation limit points of the frequency modulation signal of each second unit duration is smaller than the preset threshold; the discontinuous frequency modulation signal is of a multi-slot frame structure, and the signal is transmitted on only a part of the slots in the multiple slots.
To solve the above technical problem, an embodiment of the present invention provides a readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the method for determining continuous frequency modulation signals and discontinuous frequency modulation signals.
In order to solve the above technical problem, an embodiment of the present invention provides a terminal, which includes a memory and a processor, where the memory stores a computer program capable of being executed on the processor, and the processor executes the steps of the method for determining a continuous frequency modulation signal and a non-continuous frequency modulation signal when executing the computer program.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than the preset threshold, the frequency modulation signal of the second unit duration is received and whether the number of the frequency deviation exceeding points is smaller than the preset threshold is judged until the frequency modulation signal of which the number of the frequency deviation exceeding points of the frequency modulation signal of the second unit duration is larger than or equal to the preset threshold occurs or the frequency of receiving the frequency modulation signal of the second unit duration reaches the preset receiving frequency, and then the frequency modulation signal is judged to be a continuous frequency modulation signal or a discontinuous frequency modulation signal. By adopting the scheme, whether the received frequency modulation signal in unit time length is an effective frequency modulation signal can be detected, and whether the received signal is a continuous frequency modulation signal or a discontinuous frequency modulation signal can be quickly and accurately judged by judging whether the current signal accords with the frame structure characteristics sent by the interval time slot of the discontinuous frequency modulation signal, so that the analog-digital dual-mode technology is optimized.
Further, the first unit duration is less than a smaller duration, and/or the second unit duration is less than the smaller duration; the smaller time length is the smaller value of the sending time length and the idle time length, and the frequency modulation signals in a single unit time length can be switched at most once by selecting the proper unit time length, such as switching from continuous frequency modulation signals to discontinuous frequency modulation signals or switching from the discontinuous frequency modulation signals to the continuous frequency modulation signals, thereby avoiding misjudgment caused by excessive switching.
Further, the total duration of the second unit durations of the preset receiving times is greater than the sending duration, the preset receiving times is the minimum value, so that the proper unit duration can be selected, the total duration of the received frequency modulation signals is ensured to be longer by setting the total duration to be greater than the sending duration, and misjudgment caused by too short duration is avoided; the minimum value is obtained by setting the preset receiving times, so that misjudgment caused by excessive noise proportion in the received frequency modulation signal can be avoided, and the judgment accuracy is improved.
Further, the preset frequency offset threshold is selected from 1.5 times to 3 times of the maximum modulation frequency offset of the frequency modulation signal, and the difference between the discontinuous frequency modulation signal and the continuous frequency modulation signal can be represented by setting a proper and uniform preset frequency offset threshold, so that the number of frequency offset limit points of the received frequency modulation signal is compared with the number of frequency offset limit points predetermined by the predetermined continuous frequency modulation signal, and the accuracy of judgment is improved.
Further, before receiving the frequency modulation signal of the second unit duration and determining whether the number of the frequency offset exceeding points is smaller than the preset threshold, the method further includes: if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is larger than or equal to the preset threshold, the sleep is carried out in the preset sleep duration, then the frequency modulation signal of the first unit duration is continuously received, and whether the number of the frequency deviation exceeding points is smaller than the preset threshold is judged, so that the detection frequency for firstly detecting whether the received frequency modulation signal of the unit duration is an effective frequency modulation signal can be reduced, and the power consumption of the terminal is effectively reduced.
Drawings
FIG. 1 is a diagram of a frame structure of a speech signal in the prior art;
FIG. 2 is a flowchart illustrating a method for determining continuous FM signals and discontinuous FM signals according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the frequency discriminated output of various signals in an embodiment of the present invention;
FIG. 4 is a diagram illustrating ranges of instantaneous frequency offsets at different SINRs in an embodiment of the present invention;
FIG. 5 is a flow chart of another method for determining continuous FM signals and non-continuous FM signals according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of an FM analog signal and DMR digital mode determination system according to an embodiment of the invention;
fig. 7 is a schematic structural diagram of a device for determining continuous fm signals and discontinuous fm signals according to an embodiment of the invention.
Detailed Description
In the existing trunking intercom communication technology, most digital interphones are in an analog-digital dual mode, but all digital interphones need to be preset with a digital or analog receiving mode, and cannot receive analog signals in the preset digital mode or digital signals in the preset analog mode. In the existing technical scheme, in order to realize digital and analog dual-mode reception, hardware manufacturing cost and complexity are often increased, or the problems of large delay and word and sentence loss in severe cases are caused.
The inventor of the invention finds out through research that in the prior art, two sets of interphone receivers can be used, one set of interphone receivers is responsible for receiving the analog system, the other set of interphone receivers simultaneously receives the digital system, and the digital and analog dual-mode receiving is realized, but the hardware manufacturing cost and the complexity are undoubtedly increased.
In another existing technical scheme, an analog sub-tone can be used to identify whether a received signal is in an analog system or a digital system, but many times, a user cannot use the method without setting the analog sub-tone when using an analog mode, which increases the complexity of the user. Further, even if the user sets the sub-tone, reliable detection requires receiving signals of about 100ms, which results in a 100ms delay. For example, it is determined that the non-analog signal is switched to the digital DMR receiving mode, and it is likely that a DMR head frame is missed due to a delay, and a word is lost, but it is also possible to distinguish between digital and analog signals by using a sync word of the DMR, but if the DMR head frame is missed, the sync word is only one at every 6 frames (the frame period is 60ms), and after the DMR head frame is received for 360ms, it is determined whether the DMR head frame is a digital or analog signal, and then the DMR receiving mode is switched to the analog mode, so that a very large delay is caused, and a word is lost, or even a sentence is lost.
Referring to fig. 1, fig. 1 is a schematic diagram of a frame structure of a speech signal in the prior art.
Specifically, the voice signal shown in fig. 1 may include a DMR dual-slot discontinuous frequency modulation signal, which is described as a discontinuous frequency modulation signal of a DMR digital interphone, where a single slot is 30ms, a communication signal occupies 27.5ms, 1.25ms on both sides is a guard time, the middle of 27.5ms is a synchronous or embedded signaling, and voice or data to be transmitted is on both sides.
Wherein, only one Time slot is used for transmitting in the DMR direct mode, and two Time slots are used simultaneously only in the relay mode or the Pacific Daylight Time (PDT) base station networking mode.
The voice signal shown in fig. 1 may further include an analog FM continuous modulation signal, wherein the analog FM continuous modulation signal exemplifies a voice signal.
The inventor of the present invention has further studied and found that, in the DMR through mode, only one slot transmits a 4FSK signal, and the other slot stops transmitting, so that when the receiver continuously receives, one segment of 30ms is a valid signal, and the next segment of 30ms is a noise floor; and for the analog FM talkback mode, the FM modulation signal is continuously transmitted, and the situation that the receiver continuously receives bottom noise does not occur. Specifically, after one frame is detected to be an FSK/FM modulation signal, the DMR digital signal is considered to be a DMR digital signal when bottom noise is detected in the next frame, and the FSK/FM modulation signal is considered to be an analog signal when 2 frames are detected and demodulated in an FM analog mode.
In the embodiment of the present invention, if the number of frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, the frequency modulation signal of the second unit duration is received and it is determined whether the number of frequency deviation exceeding points is smaller than the preset threshold, until the number of frequency deviation exceeding points of the frequency modulation signal of the second unit duration is greater than or equal to the frequency modulation signal of the preset threshold or the frequency of receiving the frequency modulation signal of the second unit duration reaches a preset receiving frequency, and it is determined that the frequency modulation signal is a continuous frequency modulation signal or a discontinuous frequency modulation signal. By adopting the scheme, whether the received frequency modulation signal in unit time length is an effective frequency modulation signal can be detected, and whether the received signal is a continuous frequency modulation signal or a discontinuous frequency modulation signal can be quickly and accurately judged by judging whether the current signal accords with the frame structure characteristics sent by the interval time slot of the discontinuous frequency modulation signal, so that the analog-digital dual-mode technology is optimized.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 2, fig. 2 is a flowchart of a method for determining a continuous frequency modulation signal and a discontinuous frequency modulation signal according to an embodiment of the present invention. The method for judging the continuous frequency modulation signal and the discontinuous frequency modulation signal may include steps S21 to S25:
step S21: receiving a frequency modulation signal of a first unit duration;
step S22: determining the number of frequency deviation exceeding points of the frequency modulation signal of the first unit time length, wherein the frequency deviation exceeding points are points of which the frequency deviation is greater than a preset frequency deviation threshold value in the frequency modulation signal of the first unit time length;
step S23: if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, receiving the frequency modulation signal of the second unit duration and judging whether the number of the frequency deviation exceeding points is smaller than the preset threshold or not until the frequency modulation signal of the second unit duration is greater than or equal to the preset threshold or the receiving frequency of the frequency modulation signal of the second unit duration reaches the preset receiving frequency, wherein the preset threshold is the number of the frequency deviation exceeding points predetermined based on the discontinuous frequency modulation signal;
step S24: if the frequency deviation exceeding point number of the frequency modulation signal of the second unit time length is larger than or equal to the frequency modulation signal of the preset threshold, judging that the frequency modulation signal is a discontinuous frequency modulation signal;
step S25: and if the receiving times of the frequency modulation signals of the second unit duration reach the preset receiving times and the number of the frequency deviation exceeding points of the frequency modulation signals of each second unit duration is smaller than the preset threshold, judging that the frequency modulation signals are continuous frequency modulation signals.
The discontinuous frequency modulation signal is of a multi-slot frame structure, and the signal is transmitted on only a part of the slots in the multiple slots.
It will be appreciated that in a specific implementation, the method may be implemented in the form of a software program running on a processor integrated within a chip or chip module.
In an implementation of step S21, the frequency modulated signal is received for a first unit of time and then measured.
The frequency modulation signal is a frequency modulation signal to be judged, and can be one of a discontinuous frequency modulation signal and a continuous frequency modulation signal of a multi-slot frame structure. Specifically, the multi-slot frame structure discontinuous frequency modulation signal is a signal transmitted only on a part of the plurality of slots.
As shown in fig. 1, DMR dual-slot discontinuous fm signals transmit only on one of the dual slots.
Further, each frame duration of the discontinuous frequency modulation signal may be divided into a transmission duration of a transmission signal and an idle duration of an unsent signal; the first unit duration is less than a smaller duration; and/or the second unit duration is less than the smaller duration; wherein the smaller duration is the smaller value of the sending duration and the idle duration.
Taking the DMR dual-slot discontinuous fm signal shown in fig. 1 as an example, the transmission duration and the idle duration are both 30 ms.
In a specific implementation, the number of timeslots of the frame structure may be set to other numbers, and the ratio of the transmission duration to the idle duration may be set to other ratios. For example, the frame structure is set to 3 slots, the transmission duration is 2 slots, and the idle duration is 1 slot.
In the embodiment of the present invention, the first unit duration is less than a smaller duration, and/or the second unit duration is less than the smaller duration, where the smaller duration is a smaller value of the transmission duration and the idle duration, and it is possible to ensure that at most one switching occurs in a single received frequency modulation signal by selecting a suitable first unit duration and a suitable second unit duration, for example, switching from a continuous frequency modulation signal to a discontinuous frequency modulation signal, or switching from the discontinuous frequency modulation signal to the continuous frequency modulation signal, thereby avoiding erroneous determination due to excessive switching.
Furthermore, the total duration of the second unit durations of the preset receiving times is greater than the sending duration, and the preset receiving times is the minimum.
In the embodiment of the present invention, the total duration of the second unit durations of the preset receiving times is greater than the sending duration, and the preset receiving times is the minimum value, so that a suitable second unit duration can be selected, and the total duration of the received frequency modulation signal is ensured to be longer by setting the total duration to be greater than the sending duration, thereby avoiding misjudgment caused by too short duration; the minimum value is obtained by setting the preset receiving times, so that misjudgment caused by excessive noise proportion in the received frequency modulation signal can be avoided, and the judgment accuracy is improved.
Further, the first unit duration may be equal to the second unit duration, so that the operation complexity may be reduced by setting a uniform unit duration.
Furthermore, the first unit duration may be smaller than the second unit duration, so that by setting the smaller first unit duration, when determining whether the frequency modulation signal is valid or not, the receiving time is reduced, and the determination efficiency is improved.
Further, the first unit duration may be greater than the second unit duration, so that by setting a smaller second unit duration, when the type of the frequency modulation signal is determined to be a continuous frequency modulation signal or a discontinuous frequency modulation signal, a shorter frequency modulation signal is adopted, and the determination accuracy is improved.
In a specific implementation of step S22, the number of frequency offset exceeding points of the frequency modulated signal of the first unit duration is determined, where the frequency offset exceeding points are points where the frequency offset in the frequency modulated signal of the first unit duration is greater than a preset frequency offset threshold.
Specifically, since the general reception level is close to the background noise in the actual environment, the error is very large and it is basically unusable. In the embodiment of the invention, whether the frequency discrimination signal is a valid frequency modulation signal can be detected by counting the frequency of the frequency discrimination output is greater than a certain frequency modulation threshold number.
Further, the step of determining the number of frequency offset exceeding points of the frequency modulated signal of the first unit duration may include: and carrying out digital frequency discrimination on the frequency modulation signal with the first unit time length so as to determine the number of the frequency deviation exceeding limit points.
Specifically, the following formula may be used to determine the instantaneous frequency offset of the frequency modulated signal:
m(n)×k f ＝φ d (n)/2πTs
where m (n) is used to represent a frequency modulated signal, k f M (n) x k for expressing the degree of modulation f For indicating the instantaneous frequency offset of the frequency modulated signal and Ts for indicating the period of the digital samples.
In the FM/FSK frequency modulation system, the digital FSK Signal before synchronization cannot measure the Signal to Interference plus Noise Ratio (SINR), so that the number of the glitches far larger than the maximum frequency offset of the system design in the current received frame can be counted to determine whether the digital FSK Signal is an effective frequency modulation Signal.
Referring to fig. 3, fig. 3 is a schematic diagram of frequency discrimination output of various signals according to an embodiment of the present invention.
Specifically, fig. 3 shows the DMR 4FSK one-frame signal frequency discrimination output results based on a plurality of SINRs, for example, the output results including SINRs of 30dB, 10dB, 3dB, -3dB, respectively, and the white noise signal frequency discrimination output results.
It can be seen that the smaller the SINR, the stricter the criterion, and the greater the number of spurs.
The 4FSK modulator may be a conventional 4FSK modulator, for example, composed of a square root raised cosine filter and a frequency modulator cascaded together, and in the embodiment of the present invention, the specific structure of the 4FSK modulator is not limited.
In a specific implementation manner of the embodiment of the present invention, taking a 4FSK modulation mode of a digital interphone as an example, it is counted that a glitch far larger than the maximum frequency offset of the system design occurs in the next frame (30ms) of frequency modulation signals with different input SINR ratios.
Referring to table 1, table 1 is a DMR FSK modulation frequency offset table.
TABLE 1
Specifically, the DMR FSK modulation frequency offset shown in table 1 may be a frequency offset corresponding to a digital symbol of a DMR digital interphone.
In the embodiment of the present invention, for each SINR, a sampling rate of 38.4kHz may be selected, 1152 sampling points are sampled within 30ms, and digital frequency discrimination and frequency offset statistics are performed.
In specific implementation, in order to improve accuracy, the same frequency modulation signal may be sampled successively to count frequency offset limit points under different SINRs, and the strength of the frequency modulation signal may be set to be consistent.
With reference to table 2 and fig. 4, table 2 is a statistical result of the frequency offset exceeding point under the above conditions, fig. 4 is a schematic diagram of the range of instantaneous frequency offset under different SINRs in the embodiment of the present invention, and is also a result of imaging the numbers in table 2.
TABLE 2
Specifically, taking SINR-3 dB and preset frequency offset threshold of 7kHz as an example, the predetermined frequency offset limit point statistic shown in table 2 is 49; taking SINR as 0dB and the preset frequency offset threshold as 10kHz as an example, the statistical value of the predetermined frequency offset limit point shown in table 2 is 15.
It can be understood that, if the second unit duration is different from the sampling duration adopted when the statistics of the frequency offset exceeding point is predetermined, and if the number of sampling points is different from the number of sampling points adopted when the statistics of the frequency offset exceeding point is predetermined, the statistics of the frequency offset exceeding point can be increased or decreased in equal proportion. For example, if the SINR is 0dB and the preset frequency offset threshold is 10kHz, if the second unit duration is 15ms (half of 30ms) and the number of sampling points is 576 (i.e., half of 1152), then 15/4 ≈ 4 can be calculated according to the predetermined frequency offset limit statistic value 15 shown in table 2.
In a specific implementation, the parameter of the preset frequency offset threshold may be set to freq _ OffsetLmt, and may be determined according to a maximum modulation frequency offset of the frequency modulation signal.
Wherein, the maximum modulation frequency offset of the frequency modulation signal can be uniquely determined according to a communication protocol, for example, can be determined according to technical specifications of the PDT digital trunking communication system.
It should be noted that, if the preset frequency offset threshold is set too high, the number of detected glitches is too small, and the discontinuous frequency modulation signal is easily determined as a continuous frequency modulation signal by mistake; if the preset frequency offset threshold value is too low, the number of detected burrs is too large, and the continuous frequency modulation signal is easily judged to be a discontinuous frequency modulation signal by mistake.
In the embodiment of the present invention, as a non-limiting example, the preset frequency offset threshold may be selected from 1.5 times to 3 times of the maximum modulation frequency offset of the frequency modulation signal, and may be set to be 2 times, for example.
In a specific embodiment, a national standard GB12192 signal is used, and if the maximum modulation frequency offset is 4kHz, the preset frequency offset threshold may be set to 8kHz, or the preset frequency offset threshold may be set to 7 kHz.
In the embodiment of the present invention, the preset frequency offset threshold is selected from 1.5 times to 3 times of the maximum modulation frequency offset of the frequency modulation signal, and the difference between the discontinuous frequency modulation signal and the continuous frequency modulation signal can be represented by setting an appropriate and uniform preset frequency offset threshold, so as to compare the number of frequency offset limit points of the received frequency modulation signal with the number of predetermined frequency offset limit points of the predetermined continuous frequency modulation signal, thereby improving the accuracy of the judgment.
With continued reference to fig. 2, in a specific implementation of step S23, if the number of frequency deviation exceeding points of the frequency modulated signal of the first unit duration is smaller than a preset threshold, receiving the frequency modulated signal of the second unit duration and determining whether the number of frequency deviation exceeding points is smaller than the preset threshold, until the number of frequency deviation exceeding points of the frequency modulated signal of the second unit duration is greater than or equal to the preset threshold or the number of times of receiving the frequency modulated signal of the second unit duration reaches a preset number of times of receiving, where the preset threshold is the number of frequency deviation exceeding points predetermined based on the discontinuous frequency modulated signal.
Specifically, if it is determined in step S22 that the number of frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than the preset threshold, it may be determined that the frequency modulation signal is an invalid frequency modulation signal, and may wait for receiving the frequency modulation signal for a while or immediately receive the frequency modulation signal.
The preset threshold may be the number of frequency offset exceeding points predetermined based on the discontinuous frequency modulation signal of the unit duration, and more specifically, may be determined based on the statistics of the frequency offset exceeding points, for example, the statistics of the frequency offset exceeding points after sampling 1152 sampling points within 30ms and performing digital frequency discrimination and frequency offset statistics shown in table 2.
Further, a preset threshold may be set as the statistic of the frequency offset exceeding point, and may also be set as M times the statistic of the frequency offset exceeding point, where M may be a rational number, for example, selected from 0.8 to 1.5.
Further, before receiving the frequency modulation signal of the second unit duration and determining whether the number of the frequency offset exceeding points is smaller than the preset threshold, the method may further include: if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is larger than or equal to a preset threshold, performing dormancy in a preset dormancy duration, then continuously receiving the frequency modulation signal of the first unit duration and judging whether the number of the frequency deviation exceeding points is smaller than the preset threshold.
Specifically, if the number of frequency offset exceeding points of the frequency modulation signal of the first unit duration is greater than or equal to a preset threshold, it may be determined that the frequency modulation signal is an invalid frequency modulation signal, and then a power-saving sleep may be performed for a period of time, that is, the sleep is performed within a preset sleep duration, and then the frequency modulation signal of the first unit duration continues to be received.
In a specific implementation manner of the embodiment of the present invention, the step of sleep may be set only in the phase of receiving the frequency modulated signal of the first unit duration, and the continuous receiving manner may be adopted in the phase of receiving the frequency modulated signal of the second unit duration, so as to more accurately determine the type of the current frequency modulated signal.
In this embodiment of the present invention, before receiving the frequency modulation signal of the second unit duration and determining whether the number of the frequency offset exceeding points is smaller than the preset threshold, the method may further include: if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is larger than or equal to the preset threshold, the sleep is carried out in the preset sleep duration, then the frequency modulation signal of the first unit duration is continuously received, and whether the number of the frequency deviation exceeding points is smaller than the preset threshold is judged, so that the detection frequency for firstly detecting whether the received frequency modulation signal of the first unit duration is an effective frequency modulation signal can be reduced, and the power consumption of the terminal is effectively reduced.
In step S24, if the frequency offset exceeding point number of the frequency modulation signal of the second unit duration is greater than or equal to the frequency modulation signal of the preset threshold, it is determined that the frequency modulation signal is a discontinuous frequency modulation signal.
In step S25, if the frequency of receiving the frequency modulation signal of the second unit duration reaches the preset receiving frequency and the number of frequency offset exceeding points of the frequency modulation signal of each second unit duration is smaller than the preset threshold, it is determined that the frequency modulation signal is a continuous frequency modulation signal.
Specifically, the frequency modulation signal of the second unit duration may be continuously received, the digital frequency discrimination output result of the received signal is compared with the preset frequency offset threshold, and the number of points greater than the preset frequency offset threshold within each second unit duration, that is, the frequency offset overrun point, is counted, where the frequency offset overrun point may be represented by a parameter freq _ outrangennum.
If the frequency modulation signals with the frequency deviation exceeding points more than or equal to the preset threshold value appear in the continuously received frequency modulation signals with one or more second unit time lengths, the frequency modulation signals are considered to be frequency modulation signals sent at intervals, and the frequency modulation signals are judged to be discontinuous frequency modulation signals (such as DMR digital mode systems, DMR digital mode demodulation decoding receiving is carried out); and if the number of the frequency deviation exceeding points of the frequency modulation signals which all meet the second unit time length is smaller than the preset threshold, the received continuous frequency modulation signals are considered (for example, FM analog mode, FM analog demodulation and reception are carried out).
Further, the continuous frequency modulation signal may be an analog FM signal, and the discontinuous frequency modulation signal may be a DMR digital signal.
Taking the civil interphone as an example, most of the applications of the civil interphone are in the direct mode, so the method for distinguishing the analog mode and the digital mode by using the frame structure in the DMR direct mode can cover most of the applications of the civil interphone.
In the embodiment of the invention, the continuous frequency modulation signal can be an analog FM signal, and the discontinuous frequency modulation signal can be a DMR digital signal, so that the modulation technology of the civil interphone can be effectively optimized.
In the embodiment of the invention, if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than the preset threshold, the frequency modulation signal of the second unit duration is received and whether the number of the frequency deviation exceeding points is smaller than the preset threshold is judged until the frequency modulation signal of which the number of the frequency deviation exceeding points of the frequency modulation signal of the second unit duration is larger than or equal to the preset threshold occurs or the frequency of receiving the frequency modulation signal of the second unit duration reaches the preset receiving frequency, and then the frequency modulation signal is judged to be a continuous frequency modulation signal or a discontinuous frequency modulation signal. By adopting the scheme, whether the received frequency modulation signal in unit time length is an effective frequency modulation signal can be detected, and whether the received signal is a continuous frequency modulation signal or a discontinuous frequency modulation signal can be quickly and accurately judged by judging whether the current signal accords with the frame structure characteristics sent by the interval time slot of the discontinuous frequency modulation signal, so that the analog-digital dual-mode technology is optimized.
Referring to fig. 5, fig. 5 is a flowchart of another method for determining continuous frequency modulation signals and discontinuous frequency modulation signals according to an embodiment of the present invention. The other method for determining a continuous fm signal and a discontinuous fm signal may include steps S501 to S514, which are described below.
In step S501, a frequency modulation signal of a first unit duration is received.
In step S502, the number of frequency offset exceeding points of the frequency modulated signal of the first unit duration is determined.
In step S503, it is determined whether the number of frequency offset exceeding points is smaller than a preset threshold, and if yes, step S504 may be executed; otherwise, the execution may return to step S501.
In a specific embodiment, the sampling frequency may be set to 38.4kHz, and the preset frequency offset threshold may be set to 7kHz, and specifically, the maximum modulation frequency offset may be determined according to the national standard GB12192 signal to be 4 kHz.
It may also set SINR to be 0, set the first unit time length to be T to be 15ms, specifically, may be the time length of half DMR timeslot, and then obtain a statistical value of a point where the frequency offset is greater than 7kHz according to the foregoing table 2 to be 26, at this time, 26 may be used as the preset threshold, and reference may also be made to the preset multiple of 26 as the preset threshold.
It should be noted that step S501 may be executed after the sleep is performed within the preset sleep time period.
In step S504, a frequency modulation signal of a second unit duration is received and the number of frequency offset exceeding points is determined.
In step S505, it is determined whether the number of frequency offset exceeding points of the frequency modulation signal of the second unit duration is smaller than a preset threshold, and if the determination result is yes, step S506 may be executed; otherwise, step S514 may be performed.
Specifically, if the second time unit is equal to the first time unit, 26 may be continuously adopted as the preset threshold, and a preset multiple of 26 may also be referred to as the preset threshold.
In step S506, it is determined whether the receiving frequency of the frequency modulation signal received in the second unit duration reaches a preset receiving frequency, and when the determination result is yes, step S513 may be executed; otherwise, step S507 may be performed.
In step S507, the frequency modulation signal of the second unit duration is received and the number of frequency offset exceeding points is determined.
In step S508, it is determined whether the frequency offset of the frequency modulation signal of the second unit duration exceeds the number of the threshold, and if yes, step S509 may be executed; otherwise, step S514 may be performed.
In step S509, it is determined whether the receiving frequency of the frequency modulation signal received for the second unit duration reaches a preset receiving frequency, and when the determination result is yes, step S513 may be executed; otherwise, step S510 may be performed.
It is noted that in the embodiment of the present invention, the preset number of times of reception may be set to 2, and then in step S509, the number of times of reception of the frequency modulated signal of the second unit duration has reached 2, and step S513 may be performed.
In step S510, a frequency modulated signal of a second unit duration is received and the number of frequency offset exceeding points is determined.
It should be noted that, between step S509 and step S510, an ellipsis is used to indicate that if the preset receiving frequency has not been reached, step S507 to step S510 may be executed for multiple times until the receiving frequency of the frequency modulation signal received in the second unit duration reaches the preset receiving frequency minus one, and then step S510 is executed again.
In step S511, it is determined whether the frequency offset of the frequency modulation signal of the second unit duration exceeds the number of the threshold, and if yes, step S512 may be executed; otherwise, step S514 may be performed.
In step S512, the receiving frequency of the frequency modulation signal received in the second unit duration reaches the preset receiving frequency.
In step S513, it is determined that the frequency is continuously modulated.
In step S514, it is determined that the frequency modulation signal is discontinuous.
Specifically, if the number of frequency offset exceeding points of any frequency modulation signal of the second unit duration is greater than or equal to the preset threshold, it may be determined that there are many glitches, and it may be determined that the frequency modulation signal is sent at an interval time slot, for example, the frequency modulation signal may be in a DMR digital mode system, and needs to be demodulated, decoded and received in a DMR digital mode; if the number of the frequency deviation exceeding points is less than the preset threshold value continuously, the received continuous frequency modulation signal can be considered as a continuous frequency modulation signal, the FM analog system can be judged, and FM analog demodulation receiving is required.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an FM analog signal and DMR digital mode determining system in an embodiment of the invention.
Specifically, a Radio Frequency (RF) chip 61 may be used to receive a frequency modulated signal from an antenna, and then an analog-to-Digital conversion (a/D) module 62 may be used to input the converted signal to a Digital Front-end (DFE) module 63.
The digital frequency discrimination module 64 may then be used to perform digital frequency discrimination processing, and then the FM analog/DMR digital mode determining module 65 may be used to determine whether the FM signal is an FM analog signal or a DMR digital mode signal.
For more details of step S64 to step S65, please refer to the above and the detailed description of fig. 2 to fig. 5 for further description.
If the FM analog signal is determined, the analog audio processing and playing module 66 may be used to play, and if the DMR digital mode signal is determined, the DMR digital time-frequency and frequency offset synchronization module 67 may be used to perform frequency offset synchronization.
The digital receive decision and FEC channel decoding module 68 may then be used for decoding, processing with the upper protocol stack processing module 69, and decoding with the audio vocoder decoding module 610.
It should be noted that steps S66 to S70 only show one type of signal processing steps that can be used, and are not intended to limit the embodiments of the present application.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a device for determining continuous frequency modulation signals and discontinuous frequency modulation signals according to an embodiment of the present invention. The device for judging the continuous frequency modulation signal and the discontinuous frequency modulation signal can comprise:
a receiving module 71, configured to receive a frequency modulated signal of a first unit duration;
a quantity determining module 72, configured to determine a quantity of frequency offset exceeding points of the frequency modulation signal of the first unit duration, where the frequency offset exceeding points are points where frequency offset in the frequency modulation signal of the first unit duration is greater than a preset frequency offset threshold;
a comparing module 73, configured to receive the frequency modulation signal of the second unit duration and determine whether the number of frequency offset exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, until the number of frequency offset exceeding points of the frequency modulation signal of the second unit duration is greater than or equal to the preset threshold or the number of times of receiving the frequency modulation signal of the second unit duration reaches a preset receiving number, where the preset threshold is the number of frequency offset exceeding points predetermined based on the discontinuous frequency modulation signal;
a discontinuous signal determining module 74, configured to determine that the frequency modulation signal is a discontinuous frequency modulation signal when the frequency offset exceeding point number of the frequency modulation signal of the second unit duration is greater than or equal to the frequency modulation signal of the preset threshold;
a continuous signal determining module 75, configured to determine that the frequency modulation signal is a continuous frequency modulation signal when the number of receiving times reaches the preset receiving times and the number of frequency offset exceeding points of the frequency modulation signal of each second unit duration is smaller than the preset threshold;
the discontinuous frequency modulation signal is of a multi-slot frame structure, and the signal is transmitted on only a part of the slots in the multiple slots.
In a specific implementation, the apparatus may correspond to a chip having a data processing function in a user equipment; or to a chip module comprising a chip with data processing function in the user equipment, or to the user equipment.
For the principle, specific implementation and beneficial effects of the continuous fm signal and the discontinuous fm signal determining apparatus, please refer to the related description of the continuous fm signal and the discontinuous fm signal determining method described above, and details thereof are not repeated herein.
Embodiments of the present invention also provide a readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the above method. The readable storage medium may be a computer readable storage medium, and may include, for example, a non-volatile (non-volatile) or non-transitory (non-transitory) memory, and may further include an optical disc, a mechanical hard disk, a solid state hard disk, and the like.
Specifically, in the embodiment of the present invention, the processor may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will also be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash memory. Volatile memory may be Random Access Memory (RAM) which acts as external cache memory. By way of example and not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM), SDRAM (SLDRAM), synchlink DRAM (SLDRAM), and direct bus RAM (DR RAM).
The embodiment of the invention also provides a terminal, which comprises a memory and a processor, wherein the memory is stored with a computer program capable of running on the processor, and the processor executes the steps of the method when running the computer program.
Specifically, the terminal in the embodiment of the present application may refer to an intercom, such as a civil intercom.
Further, a terminal in this embodiment may also refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal device), a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with a Wireless communication function, a computing device or other processing devices connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment.
It should be understood that the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this document indicates that the former and latter related objects are in an "or" relationship.
The "plurality" appearing in the embodiments of the present application means two or more.
The descriptions of the first, second, etc. appearing in the embodiments of the present application are only for illustrating and differentiating the objects, and do not represent the order or the particular limitation of the number of the devices in the embodiments of the present application, and do not constitute any limitation to the embodiments of the present application.
With regard to each module/unit included in each apparatus and product described in the above embodiments, it may be a software module/unit, or may also be a hardware module/unit, or may also be a part of a software module/unit and a part of a hardware module/unit. For example, for each device or product applied to or integrated into a chip, each module/unit included in the device or product may be implemented by hardware such as a circuit, or at least a part of the module/unit may be implemented by a software program running on a processor integrated within the chip, and the rest (if any) part of the module/unit may be implemented by hardware such as a circuit; for each device or product applied to or integrated with the chip module, each module/unit included in the device or product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least some of the modules/units may be implemented by using a software program running on a processor integrated within the chip module, and the rest (if any) of the modules/units may be implemented by using hardware such as a circuit; for each device and product applied to or integrated in the terminal, each module/unit included in the device and product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components in the terminal, or at least part of the modules/units may be implemented by using a software program running on a processor integrated in the terminal, and the rest (if any) part of the modules/units may be implemented by using hardware such as a circuit.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for judging continuous frequency modulation signals and discontinuous frequency modulation signals is characterized by comprising the following steps:
receiving a frequency modulation signal of a first unit duration;
determining the number of frequency offset exceeding points of the frequency modulation signal of the first unit duration, wherein the frequency offset exceeding points are points of which the frequency offset is greater than a preset frequency offset threshold value in the frequency modulation signal of the first unit duration;
if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, receiving the frequency modulation signal of the second unit duration and judging whether the number of the frequency deviation exceeding points is smaller than the preset threshold or not until the frequency modulation signal of the second unit duration is greater than or equal to the preset threshold or the receiving frequency of the frequency modulation signal of the second unit duration reaches the preset receiving frequency, wherein the preset threshold is the number of the frequency deviation exceeding points predetermined based on the discontinuous frequency modulation signal;
if the frequency deviation exceeding point number of the frequency modulation signal with the second unit duration is larger than or equal to the frequency modulation signal with the preset threshold, judging that the frequency modulation signal is a discontinuous frequency modulation signal;
if the receiving times of the frequency modulation signals of the second unit duration reach the preset receiving times and the number of the frequency deviation limit points of the frequency modulation signals of each second unit duration is smaller than the preset threshold value, judging that the frequency modulation signals are continuous frequency modulation signals;
the discontinuous frequency modulation signal is of a multi-slot frame structure, and the signal is transmitted on only a part of the slots in the multiple slots.
2. The method according to claim 1, wherein each frame duration of the discontinuous frequency modulation signal is divided into a transmission duration of a transmission signal and an idle duration of a non-transmission signal;
the first unit duration is less than a lesser duration;
and/or the presence of a gas in the atmosphere,
the second unit duration is less than the smaller duration;
wherein the smaller duration is the smaller value of the sending duration and the idle duration.
3. The judgment method according to claim 2,
the total time length of the second unit time length of the preset receiving times is larger than the sending time length, and the preset receiving times is the minimum value.
4. The method of claim 1, wherein the predetermined frequency offset threshold is determined according to a maximum modulation frequency offset of the frequency modulation signal.
5. The method of claim 1, wherein the predetermined frequency offset threshold is selected from 1.5 times to 3 times of a maximum modulation frequency offset of the frequency modulation signal.
6. The method according to claim 1, wherein the continuous frequency modulation signal is an analog FM signal, and the discontinuous frequency modulation signal is a DMR digital signal.
7. The method of claim 1, before receiving the frequency modulated signal of the second unit duration and determining whether the number of frequency offset exceeding points is less than the preset threshold, further comprising:
if the number of the frequency deviation exceeding points of the frequency modulation signal of the first unit duration is larger than or equal to a preset threshold, performing dormancy in a preset dormancy duration, then continuously receiving the frequency modulation signal of the first unit duration and judging whether the number of the frequency deviation exceeding points is smaller than the preset threshold.
8. A device for judging continuous frequency modulation signals and discontinuous frequency modulation signals is characterized by comprising:
the receiving module is used for receiving the frequency modulation signal of the first unit duration;
a quantity determining module, configured to determine the quantity of frequency offset exceeding points of the frequency modulation signal of the first unit duration, where the frequency offset exceeding points are points at which frequency offset in the frequency modulation signal of the first unit duration is greater than a preset frequency offset threshold;
a comparison module, configured to receive the frequency modulation signal of the second unit duration and determine whether the number of frequency offset exceeding points of the frequency modulation signal of the first unit duration is smaller than a preset threshold, until the number of frequency offset exceeding points of the frequency modulation signal of the second unit duration is greater than or equal to the preset threshold or the number of times of receiving the frequency modulation signal of the second unit duration reaches a preset number of times of reception, when the number of frequency offset exceeding points of the frequency modulation signal of the first unit duration is smaller than the preset threshold, where the preset threshold is a number of frequency offset exceeding points predetermined based on the discontinuous frequency modulation signal;
the discontinuous signal judgment module is used for judging that the frequency modulation signal is a discontinuous frequency modulation signal when the frequency offset limit point number of the frequency modulation signal with the second unit duration is greater than or equal to the frequency modulation signal with the preset threshold value;
the continuous signal judgment module is used for judging that the frequency modulation signal is a continuous frequency modulation signal when the receiving times reach the preset receiving times and the number of frequency deviation limit points of the frequency modulation signal of each second unit duration is smaller than the preset threshold;
the discontinuous frequency modulation signal is of a multi-slot frame structure, and the signal is transmitted on only a part of the slots in the multiple slots.
9. A readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, performs the steps of the method for determining a chirp and a non-chirp according to any one of claims 1 to 7.
10. A terminal comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor executes the computer program to perform the steps of the method of determining chirp signals and non-chirp signals of any one of claims 1 to 7.
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| CN111294304A (en) * | 2019-04-12 | 2020-06-16 | 展讯通信（上海）有限公司 | Frequency modulation signal processing method and device, storage medium and frequency modulation receiver |
| CN111294124A (en) * | 2019-04-12 | 2020-06-16 | 展讯通信（上海）有限公司 | Method and device for detecting quality of frequency modulation signal, storage medium and frequency modulation receiver |
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| CN107404450A (en) * | 2017-08-02 | 2017-11-28 | 锐捷网络股份有限公司 | The method and device of demodulated signal |
| CN111294304A (en) * | 2019-04-12 | 2020-06-16 | 展讯通信（上海）有限公司 | Frequency modulation signal processing method and device, storage medium and frequency modulation receiver |
| CN111294124A (en) * | 2019-04-12 | 2020-06-16 | 展讯通信（上海）有限公司 | Method and device for detecting quality of frequency modulation signal, storage medium and frequency modulation receiver |
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