CN108880718B - Frequency modulation broadcast real-time monitoring system, receiver and frequency modulation broadcast real-time monitoring method - Google Patents
Frequency modulation broadcast real-time monitoring system, receiver and frequency modulation broadcast real-time monitoring method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/12—Arrangements for observation, testing or troubleshooting
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- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/18—Monitoring during normal operation
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Abstract
The invention provides a frequency modulation broadcast real-time monitoring system, a receiver and a frequency modulation broadcast real-time monitoring method, which are characterized by comprising the following steps: a signal generator outputting an audio signal; the transmitter receives the audio signal and transmits an audio modulation signal after modulation; and the receiver receives and demodulates the audio modulation signal to obtain an audio demodulation signal, wherein the receiver comprises a real-time monitoring module and receives and processes the audio signal and the audio demodulation signal in real time to output a transmitter performance index parameter. By the technical scheme provided by the invention, the performance of the frequency modulation broadcast transmitter can be monitored on the premise of not adopting other special test instrument equipment, and the normal work of the frequency modulation broadcast transmitter is not required to be interrupted so as to meet the requirement of real-time monitoring.
Description
Technical Field
The invention relates to the field of testing of frequency modulation broadcast transmitters, in particular to a frequency modulation broadcast real-time monitoring system, a receiver with a real-time monitoring function and a frequency modulation broadcast real-time monitoring method.
Background
In the prior art, any broadcast station, regardless of its size, for example: the national radio station, the provincial radio station, the municipal radio station, the county radio station, the campus radio station, the enterprise and public institution radio station, the army barracks radio station and the like are all composed of audio broadcasting control equipment, audio transmission equipment, a frequency modulation broadcasting transmitter and a transmitting antenna feeder. The frequency modulation broadcast transmitter sends out the audio signal in a frequency modulation mode.
In a conventional performance test of an fm broadcast transmitter, a receiver usually needs to use a dedicated device to complete measurement of indexes such as a signal-to-noise ratio, a distortion degree, and a frequency response value, such as a level meter, a distortion degree meter, and the like, which is inconvenient and inefficient. In addition, the performance test of the fm broadcast transmitter needs to interrupt the normal broadcast program, i.e. the off-line test, and cannot monitor the performance index of the fm broadcast transmitter in real time when the fm broadcast transmitter is working normally, which does not meet the current requirement for monitoring the performance of the fm broadcast transmitter in real time.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in the performance test of the frequency modulation broadcast transmitter, the performance index needs to be measured by means of special equipment, so that the test process lacks convenience and efficiency, the test must be performed off-line, and a normal broadcast program needs to be interrupted, so that the performance test method is not suitable for the requirement of monitoring the performance of the frequency modulation broadcast transmitter in real time at present.
In order to solve the above problem, an embodiment of the present invention provides a system for monitoring fm broadcast in real time, including: a signal generator outputting an audio signal; the transmitter receives the audio signal and transmits an audio modulation signal after modulation; and the receiver receives and demodulates the audio modulation signal to obtain an audio demodulation signal, wherein the receiver comprises a real-time monitoring module and receives and processes the audio signal and the audio demodulation signal in real time to output a transmitter performance index parameter.
Optionally, the real-time monitoring module includes: the sampling synchronization unit is used for respectively carrying out sampling, delay and Fourier transform processing on the audio signal and the audio demodulation signal and searching and judging a processing result; and the calculating unit is used for calculating according to the processing result so as to obtain the performance index parameter of the transmitter.
Optionally, the sampling frequency of the sampling synchronization unit is at least 44.1KHZ, and the sampling bit width is at least 16 bits.
Optionally, the sampling synchronization unit and the computation unit include at least one of a field programmable gate array chip, a digital signal processing chip, and a processing chip based on an ARM architecture.
Optionally, the audio signal is a mono signal, a stereo signal or a mono signal.
Optionally, the transmitter performance indicator parameter includes at least one of a signal-to-noise ratio, a distortion degree, and a frequency response value.
An embodiment of the present invention further provides a receiver having a function of monitoring fm broadcast in real time, which receives an audio signal and a modulated audio modulation signal from an external device, and demodulates the received audio modulation signal to obtain an audio demodulation signal, including: and the real-time monitoring module receives and processes the audio signal and the audio demodulation signal in real time so as to output the performance index parameter of the transmitter.
Optionally, the real-time monitoring module includes: the sampling synchronization unit is used for respectively carrying out sampling, delay and Fourier transform processing on the audio signal and the audio demodulation signal and searching and judging a processing result; and the calculating unit is used for calculating according to the processing result so as to obtain the performance index parameter of the transmitter.
The embodiment of the invention also provides a frequency modulation broadcast real-time monitoring method, which comprises the following steps: step S1: sending an audio signal by a signal generator; step S2: receiving the audio signal by a transmitter, and transmitting an audio modulation signal after modulation; and step S3: and receiving and demodulating the audio modulation signal by the receiver to obtain an audio demodulation signal, wherein the audio modulation signal and the audio demodulation signal are received and processed in real time by a real-time monitoring module in the receiver so as to output the performance index parameter of the transmitter.
Optionally, the step S3 specifically includes the following steps: step S31: the sampling synchronization unit respectively carries out sampling, delay and Fourier transform processing on the audio signal and the audio demodulation signal, and searches and judges a processing result; and step S32: and calculating by the calculating unit according to the processing result to obtain the performance index parameter of the transmitter.
Optionally, the step S31 specifically includes the following steps: step S311: sampling an audio signal to obtain a first sampling signal, sampling an audio demodulation signal to obtain a second sampling signal, and obtaining the time delay of the second sampling signal relative to the first sampling signal through correlation processing and correlation peak maximum value searching; step S312: delaying the first sampling signal by the time delay, performing Fourier transform to obtain a first Fourier signal, searching for an amplitude maximum value to obtain a first amplitude maximum value and a corresponding first frequency, performing Fourier transform on the second sampling signal to obtain a second Fourier signal, and searching for an amplitude maximum value to obtain a second amplitude maximum value and a corresponding second frequency; and step S313: and judging whether the first frequency is equal to the second frequency, if not, performing correlation processing and correlation peak maximum value searching on the audio signal and the audio demodulation signal again, and if so, executing the subsequent steps.
Optionally, the step S32 specifically includes the following steps: step S321: the value of the first Fourier signal at the first frequency is a first complex value, the value of the second Fourier signal at the second frequency is a second complex value, the amplitude difference value is estimated according to the ratio of the first amplitude maximum value and the second amplitude maximum value, and the sampling frequency offset estimation value is estimated according to the ratio of the first complex value and the second complex value and the first frequency; step S322: compensating the amplitude difference value and the sampling frequency offset estimation value of the first Fourier signal to obtain a first compensation signal; step S323: subtracting the first compensation signal from the second Fourier signal to obtain a noise signal; and step S324: and calculating to obtain the performance index parameter of the transmitter according to the second Fourier signal and the noise signal.
Optionally, in step S311, the sampling frequency for sampling the audio signal and the audio demodulation signal is at least 44.1KHZ, and the sampling bit width is at least 16 bits.
Optionally, in step S1, the audio signal is a mono signal, a stereo signal or a mono signal.
Optionally, in step S3, the transmitter performance index parameter includes at least one of a signal-to-noise ratio, a distortion factor and a frequency response value.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
according to the frequency modulation broadcast real-time monitoring system, the receiver and the frequency modulation broadcast real-time monitoring method provided by the invention, the performance of the frequency modulation broadcast transmitter can be monitored in real time on the premise of not adopting other special testing instrument equipment aiming at the performance monitoring of the frequency modulation broadcast transmitter, so that the convenience and the efficiency of monitoring are improved. In addition, the performance test of the FM broadcast transmitter does not need to interrupt the normal work of the FM broadcast transmitter, can monitor the performance index of the FM broadcast transmitter on line in real time, and better meets the requirement of monitoring the performance of the FM broadcast transmitter in real time at present.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a real-time monitoring system for fm broadcast according to the present invention;
fig. 2 is a schematic flow chart of an embodiment of a real-time monitoring method for fm broadcasting according to the present invention;
fig. 3 is a schematic flow chart of an embodiment of sampling and processing an audio signal and an audio demodulation signal in a real-time monitoring method for fm broadcast according to the present invention; and
fig. 4 is a schematic flow chart illustrating an embodiment of processing, determining and calculating an audio signal and an audio demodulation signal in the fm broadcast real-time monitoring method according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the invention provides a frequency modulation broadcast real-time monitoring system. As shown in fig. 1, fig. 1 is a schematic diagram of an embodiment of a real-time monitoring system for fm broadcast according to the present invention. The FM broadcast real-time monitoring system comprises a signal generator 1, a transmitter 2 and a receiver 3. The signal generator 1 outputs an audio signal, wherein the audio signal may be a mono signal, a stereo signal or a mono signal. The transmitter 2 receives the audio signal, modulates the audio signal, and transmits an audio modulation signal. If the transmitter 2 is of the stereo type, the signal generator 1 outputs a stereo signal; and if the transmitter 2 is of the mono type, the signal generator 1 outputs a mono signal. The receiver 3 receives and demodulates the audio modulation signal to obtain an audio demodulation signal. The structures and functions of the signal generator 1 and the transmitter 2 are the same as those of the prior art, and therefore, the detailed description thereof is omitted. The modulation of the audio signal by the transmitter 2 and the demodulation of the audio modulated signal by the receiver 3 are also in accordance with the prior art and will not be described in detail herein.
Further, the receiver 3 further includes a real-time monitoring module 30, which receives and processes the audio signal output by the signal generator 1 in real time, and the audio demodulated signal obtained after the demodulation processing by the receiver 3, so as to output the transmitter performance index parameter. The real-time monitoring module 30 is integrated in the receiver 3, and the transmitter performance index parameter includes at least one of a signal-to-noise ratio, a distortion degree, and a frequency response value.
The real-time monitoring module 30 comprises a sampling synchronization unit 31 and a calculation unit 32. The sampling synchronization unit 31 performs sampling, delay, and fourier transform processing on the audio signal and the audio demodulation signal, respectively, and searches and judges a processing result. The sampling frequency of the sampling synchronization unit 31 is at least 44.1KHZ, and the sampling bit width is at least 16 bits. The calculation unit 32 performs calculation according to the processing result to obtain the transmitter performance index parameter. The sampling synchronization unit 31 and the calculation unit 32 include at least one of a Field-Programmable Gate Array (FPGA) chip, a Digital Signal Processing (DSP) chip, and an ARM architecture-based Processing chip.
The embodiment of the invention also provides a frequency modulation broadcast real-time monitoring method. As shown in fig. 2, fig. 2 is a schematic flow chart of an embodiment of a method for monitoring fm broadcast in real time according to the present invention. In one embodiment, the method can be applied to the aforementioned fm broadcast real-time monitoring system. The method comprises the following steps:
step S1: sending an audio signal by the signal generator 1;
step S2: the transmitter 2 receives the audio signal and transmits an audio modulation signal after modulation; and
step S3: the receiver 3 receives and demodulates the audio modulation signal to obtain an audio demodulation signal, wherein the real-time monitoring module 30 in the receiver 3 receives and processes the audio signal and the audio demodulation signal in real time to output a transmitter performance index parameter.
In steps S2 and S3, the process of modulating the audio signal and the process of demodulating the audio modulated signal are the same as those of the prior art, and will not be described herein again.
In step S3, the processing of the audio signal and the audio demodulation signal is performed in real time.
In step S3, the real-time monitoring module 30 performs further sampling and calculation processing on the received audio signal and the audio demodulation signal. Fig. 3 is a schematic flow chart of an embodiment of sampling and processing an audio signal and an audio demodulation signal in the fm broadcast real-time monitoring method according to the present invention. As shown in fig. 3, step S3 specifically includes the following steps:
step S31: the sampling synchronization unit 31 respectively performs sampling, delay and fourier transform processing on the audio signal and the audio demodulation signal, and searches and judges a processing result; and
step S32: the calculation unit 32 performs calculation according to the processing result to obtain the transmitter performance index parameter.
In step S31, the sampling frequency of the audio signal and the audio demodulation signal is at least 44.1KHZ, and the sampling bit width is at least 16 bits.
Fig. 4 is a schematic flow chart illustrating an embodiment of processing, determining and calculating an audio signal and an audio demodulation signal in the fm broadcast real-time monitoring method according to the present invention. As shown in fig. 4, step S31 specifically includes the following steps:
step S311: sampling the audio signal to obtain a first sampling signal, sampling the audio demodulation signal to obtain a second sampling signal, and obtaining the time delay of the second sampling signal relative to the first sampling signal through correlation processing and correlation peak maximum value searching;
step S312: delaying the first sampling signal by the time delay, performing Fourier transform to obtain a first Fourier signal, searching for an amplitude maximum value to obtain a first amplitude maximum value and a corresponding first frequency, performing Fourier transform on the second sampling signal to obtain a second Fourier signal, and searching for an amplitude maximum value to obtain a second amplitude maximum value and a corresponding second frequency; and
step S313: and judging whether the first frequency is equal to the second frequency, if not, performing correlation processing and correlation peak maximum value searching on the audio signal and the audio demodulation signal again, and if so, executing the subsequent steps.
In step S311, the first sampling signal and the second sampling signal are correlated, and the position of the maximum value of the correlation peak is searched, so as to obtain the time delay of the second sampling signal relative to the first sampling signal.
In step S312, the maximum amplitude value of the first fourier signal is searched for a first maximum amplitude value and a first frequency corresponding to the first maximum amplitude value. The amplitude maxima of the second fourier signal are searched for a second amplitude maximum and a second frequency corresponding to the second amplitude maximum.
In step S313, if the first frequency is equal to the second frequency, the detailed steps of step S32 are executed. As shown in fig. 4, step S32 specifically includes the following steps:
step S321: the value of the first Fourier signal at the first frequency is a first complex value, the value of the second Fourier signal at the second frequency is a second complex value, the amplitude difference value is estimated according to the ratio of the first amplitude maximum value and the second amplitude maximum value, and the sampling frequency offset estimation value is estimated according to the ratio of the first complex value and the second complex value and the first frequency;
step S322: compensating the amplitude difference value and the sampling frequency offset estimation value of the first Fourier signal to obtain a first compensation signal;
step S323: subtracting the first compensation signal from the second Fourier signal to obtain a noise signal; and
step S324: and calculating to obtain the performance index parameter of the transmitter according to the second Fourier signal and the noise signal.
Compared with the prior art, the FM broadcast real-time monitoring system, the receiver and the FM broadcast real-time monitoring method provided by the invention can complete the monitoring of the performance of the FM broadcast transmitter on the premise of not adopting other special test instrument equipment, and the normal work of the FM broadcast transmitter is not required to be interrupted in the test process, so that the performance index of the FM broadcast transmitter can be monitored on line in real time, the system is more convenient and higher in efficiency, and can better meet the requirement of the current FM broadcast transmitter performance real-time monitoring.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. A real-time monitoring system for fm broadcasts, comprising:
a signal generator outputting an audio signal;
the transmitter is used for receiving the audio signal and transmitting an audio modulation signal after modulation; and
a receiver for receiving and demodulating the audio modulation signal to obtain an audio demodulation signal,
the receiver comprises a real-time monitoring module, a receiving module and a processing module, wherein the real-time monitoring module is used for receiving and processing the audio signal and the audio demodulation signal in real time so as to output a transmitter performance index parameter;
the real-time monitoring module comprises:
the sampling synchronization unit is used for respectively carrying out sampling, delay and Fourier transform processing on the audio signal and the audio demodulation signal, and searching and judging a processing result, and specifically comprises the following steps:
sampling the audio signal to obtain a first sampling signal, sampling the audio demodulation signal to obtain a second sampling signal, and obtaining the time delay of the second sampling signal relative to the first sampling signal through correlation processing and correlation peak maximum value searching;
delaying the first sampling signal by the time delay, performing Fourier transform to obtain a first Fourier signal, searching for an amplitude maximum value to obtain a first amplitude maximum value and a corresponding first frequency, performing Fourier transform on the second sampling signal to obtain a second Fourier signal, and searching for an amplitude maximum value to obtain a second amplitude maximum value and a corresponding second frequency; and
judging whether the first frequency is equal to the second frequency, if not, performing correlation processing and correlation peak maximum value searching on the audio signal and the audio demodulation signal again, and if so, executing the subsequent steps; and
the calculating unit calculates according to the processing result to obtain the transmitter performance index parameter, and specifically includes the following steps:
the value of the first fourier signal at the first frequency is a first complex value and the value of the second fourier signal at the second frequency is a second complex value, estimating a magnitude difference value based on the ratio of the first magnitude maximum and the second magnitude maximum, and estimating a sample frequency offset estimate based on the ratio of the first complex value and the second complex value and the first frequency;
compensating the amplitude difference value and the sampling frequency offset estimation value for the first Fourier signal to obtain a first compensation signal;
subtracting the first compensation signal from the second Fourier signal to obtain a noise signal; and
and calculating to obtain the performance index parameter of the transmitter according to the second Fourier signal and the noise signal.
2. A fm broadcast real-time monitoring system as claimed in claim 1, wherein said sampling synchronization unit has a sampling frequency of at least 44.1KHZ and a sampling bit width of at least 16 bits.
3. A fm broadcast real-time monitoring system as claimed in claim 1, wherein said sampling synchronization unit and said computing unit includes at least one of a field programmable gate array chip, a digital signal processing chip and an ARM architecture based processing chip.
4. A fm broadcast real time monitoring system as claimed in claim 1, wherein said audio signal is a mono signal, a stereo signal or a mono signal.
5. A fm broadcast real-time monitoring system as claimed in claim 1, wherein said transmitter performance index parameter includes at least one of signal-to-noise ratio, distortion level and frequency response value.
6. A receiver with real-time monitoring function of FM broadcast, which receives audio signal and modulated audio modulation signal from external device, and demodulates the received audio modulation signal to obtain audio demodulation signal, comprising: the real-time monitoring module receives and processes the audio signal and the audio demodulation signal in real time to output a transmitter performance index parameter;
the real-time monitoring module comprises:
the sampling synchronization unit is used for respectively carrying out sampling, delay and Fourier transform processing on the audio signal and the audio demodulation signal, and searching and judging a processing result, and specifically comprises the following steps:
sampling the audio signal to obtain a first sampling signal, sampling the audio demodulation signal to obtain a second sampling signal, and obtaining the time delay of the second sampling signal relative to the first sampling signal through correlation processing and correlation peak maximum value searching;
delaying the first sampling signal by the time delay, performing Fourier transform to obtain a first Fourier signal, searching for an amplitude maximum value to obtain a first amplitude maximum value and a corresponding first frequency, performing Fourier transform on the second sampling signal to obtain a second Fourier signal, and searching for an amplitude maximum value to obtain a second amplitude maximum value and a corresponding second frequency; and
judging whether the first frequency is equal to the second frequency, if not, performing correlation processing and correlation peak maximum value searching on the audio signal and the audio demodulation signal again, and if so, executing the subsequent steps; and
the calculating unit calculates according to the processing result to obtain the transmitter performance index parameter, and specifically includes the following steps:
the value of the first fourier signal at the first frequency is a first complex value and the value of the second fourier signal at the second frequency is a second complex value, estimating a magnitude difference value based on the ratio of the first magnitude maximum and the second magnitude maximum, and estimating a sample frequency offset estimate based on the ratio of the first complex value and the second complex value and the first frequency;
compensating the amplitude difference value and the sampling frequency offset estimation value for the first Fourier signal to obtain a first compensation signal;
subtracting the first compensation signal from the second Fourier signal to obtain a noise signal; and
and calculating to obtain the performance index parameter of the transmitter according to the second Fourier signal and the noise signal.
7. A real-time monitoring method for frequency modulation broadcast is characterized by comprising the following steps:
step S1: sending an audio signal by a signal generator;
step S2: receiving the audio signal by a transmitter, and transmitting an audio modulation signal after modulation; and
step S3: receiving and demodulating the audio modulation signal by a receiver to obtain an audio demodulation signal, wherein a real-time monitoring module in the receiver receives and processes the audio signal and the audio demodulation signal in real time to output a transmitter performance index parameter;
the step S3 specifically includes the following steps:
step S31: the sampling synchronization unit respectively carries out sampling, delay and Fourier transform processing on the audio signal and the audio demodulation signal, and searches and judges a processing result; and
step S32: calculating by a calculating unit according to the processing result to obtain the transmitter performance index parameter;
the step S31 specifically includes the following steps:
step S311: sampling the audio signal to obtain a first sampling signal, sampling the audio demodulation signal to obtain a second sampling signal, and obtaining the time delay of the second sampling signal relative to the first sampling signal through correlation processing and correlation peak maximum value searching;
step S312: delaying the first sampling signal by the time delay, performing Fourier transform to obtain a first Fourier signal, searching for an amplitude maximum value to obtain a first amplitude maximum value and a corresponding first frequency, performing Fourier transform on the second sampling signal to obtain a second Fourier signal, and searching for an amplitude maximum value to obtain a second amplitude maximum value and a corresponding second frequency; and
step S313: judging whether the first frequency is equal to the second frequency, if not, performing correlation processing and correlation peak maximum value searching on the audio signal and the audio demodulation signal again, and if so, executing the subsequent steps;
the step S32 specifically includes the following steps:
step S321: the value of the first fourier signal at the first frequency is a first complex value and the value of the second fourier signal at the second frequency is a second complex value, estimating a magnitude difference value based on the ratio of the first magnitude maximum and the second magnitude maximum, and estimating a sample frequency offset estimate based on the ratio of the first complex value and the second complex value and the first frequency;
step S322: compensating the amplitude difference value and the sampling frequency offset estimation value for the first Fourier signal to obtain a first compensation signal;
step S323: subtracting the first compensation signal from the second Fourier signal to obtain a noise signal; and
step S324: and calculating to obtain the performance index parameter of the transmitter according to the second Fourier signal and the noise signal.
8. A method for real-time monitoring frequency modulation broadcast according to claim 7, wherein in step S311, the sampling frequency for sampling the audio signal and the audio demodulation signal is at least 44.1KHZ, and the sampling bit width is at least 16 bits.
9. A method for monitoring fm broadcast according to claim 7, wherein in step S1, said audio signal is a mono signal, a stereo signal or a mono signal.
10. A fm broadcast real-time monitoring method as claimed in claim 7, wherein in said step S3, said transmitter performance index parameter includes at least one of a signal-to-noise ratio, a distortion factor and a frequency response value.
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