CN106656363B - Parameter extraction circuit of broadcast monitoring receiver and parameter extraction method thereof - Google Patents
Parameter extraction circuit of broadcast monitoring receiver and parameter extraction method thereof Download PDFInfo
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- CN106656363B CN106656363B CN201611099397.XA CN201611099397A CN106656363B CN 106656363 B CN106656363 B CN 106656363B CN 201611099397 A CN201611099397 A CN 201611099397A CN 106656363 B CN106656363 B CN 106656363B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
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Abstract
The invention provides a parameter extraction circuit of a broadcast monitoring receiver and a parameter extraction method thereof, belonging to the field of communication and circuits. The parameter extraction circuit mainly comprises a power supply circuit, a detection circuit, a low-frequency amplification circuit and a signal output circuit, wherein the power supply circuit supplies power for the detection circuit, the operational amplification circuit and the signal output circuit, the detection circuit receives a target intermediate-frequency signal of which parameters need to be extracted, and sequentially performs rectification, signal amplification and filtering, the detected signal is input into the low-frequency amplification circuit to be subjected to low-frequency amplification, the signal subjected to low-frequency amplification is input into the signal output circuit, the signal output circuit processes the received signal and outputs an audio signal, and meanwhile, the peak voltage, the valley voltage and the mean voltage of the detection signal subjected to low-frequency amplification are output. The invention relates to a parameter extraction method of a broadcast monitoring receiver, which comprises the following steps: signal input, rectification, signal amplification and filtering, low frequency amplification, signal voltage extraction and audio output.
Description
Technical Field
The invention relates to a parameter extraction circuit of a broadcast monitoring receiver and a parameter extraction method thereof, belonging to the field of communication.
Background
With the increase of broadcast programs and the rapid development of broadcast technologies, people have higher and higher requirements on broadcast program contents, and the coverage scale of broadcast transmitting stations is also larger and larger. In addition, due to the lack of effective program content and source supervision means, illegal advertisement insertion events in remote areas are countless, so that the monitoring of broadcast programs is always a problem which is emphasized in China.
Currently, china sets up more than two thousand broadcast facilities. The management of such many broadcasting mechanisms establishes corresponding broadcasting and television departments at all levels, which are the industry management departments of the broadcasting and television, specially perform administrative management on programs played on the broadcasting and television, and mainly perform post supervision from the aspects of playing contents, playing time and the like. The current broadcast monitoring means mainly comprises manual monitoring, measuring equipment and multi-path monitoring equipment. The monitoring accuracy is not high, and the monitoring data cannot be recorded in real time. The broadcast monitoring system capable of monitoring broadcast playing by automatically collecting broadcast signal parameters is urgently needed by the current broadcast monitoring department.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a parameter extraction circuit of a broadcast monitoring receiver and a parameter extraction method thereof, which can extract the peak voltage, the valley voltage and the mean voltage of a detection signal, and output an audio signal at the same time, and can calculate the modulation degree of the signal through the data, and can also be used as a feedback parameter of automatic gain control to realize the automatic gain control of the local oscillator signal.
The technical scheme adopted by the invention is as follows: a parameter extraction circuit of a broadcast monitoring receiver comprises a power circuit 1, a detection circuit 2, a low-frequency amplification circuit 3 and a signal output circuit 4,
the power supply circuit 1 is connected to the corresponding power supply ends of the detection circuit 2, the low-frequency amplification circuit 3 and the signal output circuit 4, the output end of the detection circuit 2 is connected with the input end of the low-frequency amplification circuit 3, the output end of the low-frequency amplification circuit 3 is connected with the input end of the signal output circuit 4, the power supply circuit 1 comprises a direct-current voltage source U1, the direct-current voltage source U1 can output direct-current voltages of +12V and-12V, the detection circuit 2 is used for rectifying, signal amplifying and filtering received target intermediate-frequency signals needing parameter extraction, the low-frequency amplification circuit 3 is used for carrying out low-frequency amplification on the signals processed by the detection circuit 2, and the signal output circuit 4 is used for extracting peak voltage, mean voltage, valley voltage and audio signals of the detection signals after low-frequency amplification.
Specifically, the detector circuit 2 includes resistors R10, R11, R12, R13, R14, R15, diodes D1 and two D2, a ceramic capacitor C8, and an operational amplifier UC1, where the resistors R10, R11, R12, the diodes D1, D2, and the operational amplifier UC1 form a rectifying circuit, the resistors R13, R14, and the operational amplifier UC1 form an operational amplifier circuit, the resistor R15 and the ceramic capacitor C8 form a filtering circuit, the operational amplifiers used by the rectifying circuit and the operational amplifier circuit are different ports on the same integrated operational amplifier UC, and the operational amplifier UC is an operational amplifier with a model AD 827;
one end of the resistor R10 is connected with a target intermediate frequency signal of which the parameters need to be extracted, and the other end of the resistor R10 is connected with one end of the resistor R11, the anode of the diode D1 and the 2-pin of the operational amplifier UC 1; the other end of the resistor R11 is connected with the cathode of the diode D2, one end of the resistor R12 and one end of the resistor R13; the cathode of the diode D1 is connected to the anode of the diode D2 and the 1 pin of the operational amplifier UC1, and the 3 pin of the operational amplifier UC1 and the other end of the operational amplifier UC 12 are grounded; the other end of the resistor R13 is connected with one end of R14 and the 6 th pin of the operational amplifier UC 1; the other end of the resistor R14 is connected with one end of a resistor R15 and a 7 pin of an operational amplifier UC1, and a 5 pin of the operational amplifier UC1 and one end of a ceramic capacitor C8 are grounded; the other end of the resistor R15 is connected with the other end of the ceramic capacitor C8, and the connection point is connected into the low-frequency amplifying circuit 3 as an output end.
Specifically, the low-frequency amplification circuit 3 comprises resistors R16 and R18, a potentiometer R17 and an operational amplifier UA, wherein the operational amplifier UA adopts an operational amplifier with the model number of T L084, one end of the resistor R16 is connected with the output end of the detection circuit 2, the other end of the resistor R16 is connected with one end of the potentiometer R17 and a pin 2 of the operational amplifier UA, one end of the resistor R18 is grounded with a pin 3 of the operational amplifier UA, a pin 4 and a pin 11 of the operational amplifier UA are respectively connected with +12V and-12V of a direct-current voltage source U1 in the power supply circuit 1, and two ends and three ends of the potentiometer R17 are connected with the other end of the resistor R18 and a pin 1 of the operational amplifier UA, and are connected to the signal output circuit 4 by taking the pin 1 of the operational amplifier.
Specifically, the signal output circuit 4 includes resistors R, potentiometer R, operational amplifier UA, the operational amplifier UA adopts an operational amplifier with a model T084, diodes D, electrolytic capacitors C, ceramic capacitors C, and an output interface U, wherein the resistors R, the diodes D, the operational amplifier UA and the electrolytic capacitors C form a dc voltage peak value extraction circuit, the resistors R, the operational amplifier UA and the electrolytic capacitors C form a dc voltage mean value extraction circuit, the resistors R, the diodes D, the operational amplifier UA and the electrolytic capacitors C form a dc voltage valley value extraction circuit, and the resistors R, the potentiometers R and the ceramic capacitors C form an audio output circuit;
one end of the resistors R19, R22, R24 and R27 is connected to serve as the input end of the signal output circuit 4 and receives the signal from the output end of the low-frequency amplifying circuit 3; the other ends of the resistors R19, R22, R24 and R27 are respectively connected with the 5 pin, the 12 pin and the 10 pin of the operational amplifier UA and one end of a potentiometer R28; the 7 pin of the operational amplifier UA is connected with the anode of the diode D3 and the cathode of the diode D4, the 6 pin of the operational amplifier UA is connected with the anode of the diode D4 and one end of the resistor R20, the other end of the resistor R20 is connected with the cathode of the diode D3 and one end of the 1 pin of the output interface U14 and one end of the resistor R21, the other end of the resistor R21 is connected with the anode of the electrolytic capacitor C9, and the cathode of the electrolytic capacitor C9 is grounded; the 13 pin of the operational amplifier UA is connected with the 14 pin of the operational amplifier UA and one end of a resistor R23, the other end of the resistor R23 is connected with the 2 pin of an output interface U14 and the anode of an electrolytic capacitor C10, and the cathode of the electrolytic capacitor C10 is grounded; the 8 pin of the operational amplifier UA is connected with the cathode of the diode D5 and the anode of the diode D6, the 9 pin of the operational amplifier UA is connected with the cathode of the diode D6 and one end of the resistor R25, the other end of the resistor R25 is connected with the anode of the diode D5 and one end of the 3 pin of the output interface U14 and one end of the resistor R26, the other end of the resistor R26 is connected with the anode of the electrolytic capacitor C11, and the cathode of the electrolytic capacitor C11 is grounded; two ends and three ends of the potentiometer R28 are respectively connected with one end of the ceramic capacitor C12 and the ground, and the other end of the ceramic capacitor C12 is connected with the 4-pin of the output interface U14.
Preferably, the diodes D1, D2, D3, D4, D5 and D6 are diodes with the model number of 1N 60.
Preferably, the amplification factor of the low-frequency amplification can be controlled in the low-frequency amplification circuit 3 by adjusting the resistance value of the potentiometer R17.
A parameter extraction method of a broadcast monitoring receiver comprises the following steps:
firstly, receiving a target intermediate frequency signal of which parameters need to be extracted by an input end of a detection circuit 2, sequentially performing rectification, signal amplification and filtering, and outputting the detected signal to a low-frequency amplification circuit 3;
secondly, the input end of the low-frequency amplification circuit 3 receives the signal from the output end of the detection circuit 2, performs low-frequency amplification, and outputs the signal after low-frequency amplification to the signal output circuit 4;
and thirdly, the input end of the signal output circuit 4 receives the signal from the output end of the low-frequency amplification circuit 3, and the peak voltage, the mean voltage, the valley voltage and the audio signal of the detection signal after low-frequency amplification are output through a direct-current voltage peak value extraction circuit, a direct-current voltage mean value extraction circuit, a direct-current voltage valley value extraction circuit and an audio output circuit in the signal output circuit 4.
The working principle of the invention is as follows: the power supply circuit 1 supplies power to the detection circuit 2, the operational amplification circuit 3 and the signal output circuit 4, the detection circuit 2 receives a target intermediate frequency signal of which parameters need to be extracted, and sequentially performs rectification, signal amplification and filtering, the detected signal is input to the low-frequency amplification circuit 3 to be subjected to low-frequency amplification, the low-frequency amplified signal is input to the signal output circuit 4, the signal output circuit 4 processes the received signal, an audio signal is output, and meanwhile, the peak voltage, the valley voltage and the mean voltage of the low-frequency amplified detection signal are output.
The circuit has the advantages that the integrated circuits such as the operational amplifiers AD827 and T L084 are adopted, the integration level of the circuit is increased, the complexity of the circuit is reduced, and the circuit is more convenient to install and debug, the peak voltage, the valley voltage and the mean voltage of a detection signal can be extracted by the circuit, an audio signal is output at the same time, the modulation degree of the signal can be calculated through the data, and the data can also be used as a feedback parameter of automatic gain control to realize the automatic gain control of a local oscillator signal.
Drawings
FIG. 1 is a circuit block diagram of a parameter extraction circuit according to the present invention;
FIG. 2 is a flow chart of a parameter extraction method of the present invention;
fig. 3 is a circuit diagram of the power supply circuit 1 in fig. 1;
fig. 4 is a circuit diagram of the detection circuit 2 in fig. 1;
fig. 5 is a circuit diagram of the low frequency amplification circuit 3 in fig. 1;
fig. 6 is a circuit diagram of the signal output circuit 4 in fig. 1;
FIG. 7 is a circuit diagram showing the complete connection of the parameter extraction circuit according to the present invention.
The reference numbers in the figures are: the circuit comprises a power supply circuit 1, a detection circuit 2, a low-frequency amplification circuit 3 and a signal output circuit 4.
Detailed Description
The invention will be further elucidated with reference to the drawings and examples, without however being limited to the described scope of the inventive concept.
Example 1: as shown in fig. 1-7, a parameter extraction circuit of a broadcast monitoring receiver comprises a power circuit 1, a detection circuit 2, a low-frequency amplification circuit 3, and a signal output circuit 4,
the power supply circuit 1 is connected to the corresponding power supply ends of the detection circuit 2, the low-frequency amplification circuit 3 and the signal output circuit 4, the output end of the detection circuit 2 is connected with the input end of the low-frequency amplification circuit 3, the output end of the low-frequency amplification circuit 3 is connected with the input end of the signal output circuit 4, the power supply circuit 1 comprises a direct-current voltage source U1, the direct-current voltage source U1 can output direct-current voltages of +12V and-12V, the detection circuit 2 is used for rectifying, signal amplifying and filtering received target intermediate-frequency signals needing parameter extraction, the low-frequency amplification circuit 3 is used for carrying out low-frequency amplification on the signals processed by the detection circuit 2, and the signal output circuit 4 is used for extracting peak voltage, mean voltage, valley voltage and audio signals of the detection signals after low-frequency amplification.
Furthermore, the detector circuit 2 includes resistors R10, R11, R12, R13, R14, R15, diodes D1 and two D2, a ceramic capacitor C8, and an operational amplifier UC1, where the resistors R10, R11, R12, the diodes D1, D2, and the operational amplifier UC1 form a rectifier circuit, the resistors R13, R14, and the operational amplifier UC1 form an operational amplifier circuit, the resistor R15 and the ceramic capacitor C8 form a filter circuit, the operational amplifiers used by the rectifier circuit and the operational amplifier circuit are different ports on the same integrated operational amplifier UC, and the operational amplifier UC is an operational amplifier with a model AD 827;
one end of the resistor R10 is connected with a target intermediate frequency signal of which the parameters need to be extracted, and the other end of the resistor R10 is connected with one end of the resistor R11, the anode of the diode D1 and the 2-pin of the operational amplifier UC 1; the other end of the resistor R11 is connected with the cathode of the diode D2, one end of the resistor R12 and one end of the resistor R13; the cathode of the diode D1 is connected to the anode of the diode D2 and the 1 pin of the operational amplifier UC1, and the 3 pin of the operational amplifier UC1 and the other end of the operational amplifier UC 12 are grounded; the other end of the resistor R13 is connected with one end of R14 and the 6 th pin of the operational amplifier UC 1; the other end of the resistor R14 is connected with one end of a resistor R15 and a 7 pin of an operational amplifier UC1, and a 5 pin of the operational amplifier UC1 and one end of a ceramic capacitor C8 are grounded; the other end of the resistor R15 is connected with the other end of the ceramic capacitor C8, and the connection point is connected into the low-frequency amplifying circuit 3 as an output end.
The low-frequency amplifying circuit 3 further comprises resistors R16 and R18, a potentiometer R17 and an operational amplifier UA, wherein the operational amplifier UA adopts an operational amplifier with the model number of T L084, one end of the resistor R16 is connected with the output end of the detection circuit 2, the other end of the resistor R16 is connected with one end of the potentiometer R17 and a pin 2 of the operational amplifier UA, one end of the resistor R18 is grounded with a pin 3 of the operational amplifier UA, pins 4 and 11 of the operational amplifier UA are respectively connected with +12V and-12V of a direct current voltage source U1 in the power circuit 1, and the two end and the three end of the potentiometer R17 are connected with the other end of the resistor R18 and a pin 1 of the operational amplifier UA, and are connected to the signal output circuit 4 by taking the pin 1 of the operational amplifier UA as an output.
Further, the signal output circuit 4 includes resistors R19, R20, R21, R22, R23, R24, R25, R26, R27, a potentiometer R28, an operational amplifier UA, the operational amplifier UA adopts an operational amplifier with a model T L084, diodes D3, D4, D5, D6, electrolytic capacitors C9, C10, C11, a ceramic capacitor C12, and an output interface U14, wherein the resistors R19, R20, R21, the diodes D3, the operational amplifier UA, and the electrolytic capacitor C3 constitute a dc voltage peak value extraction circuit, the resistors R3, the diodes D3, the electrolytic capacitors C3, the operational amplifier UA and the electrolytic capacitor C3 constitute a dc voltage average value extraction circuit, the resistors R3, the electrolytic capacitors R3, the audio frequency output circuit, and the resistor R3;
one end of the resistors R19, R22, R24 and R27 is connected to serve as the input end of the signal output circuit 4 and receives the signal from the output end of the low-frequency amplifying circuit 3; the other ends of the resistors R19, R22, R24 and R27 are respectively connected with the 5 pin, the 12 pin and the 10 pin of the operational amplifier UA and one end of a potentiometer R28; the 7 pin of the operational amplifier UA is connected with the anode of the diode D3 and the cathode of the diode D4, the 6 pin of the operational amplifier UA is connected with the anode of the diode D4 and one end of the resistor R20, the other end of the resistor R20 is connected with the cathode of the diode D3 and one end of the 1 pin of the output interface U14 and one end of the resistor R21, the other end of the resistor R21 is connected with the anode of the electrolytic capacitor C9, and the cathode of the electrolytic capacitor C9 is grounded; the 13 pin of the operational amplifier UA is connected with the 14 pin of the operational amplifier UA and one end of a resistor R23, the other end of the resistor R23 is connected with the 2 pin of an output interface U14 and the anode of an electrolytic capacitor C10, and the cathode of the electrolytic capacitor C10 is grounded; the 8 pin of the operational amplifier UA is connected with the cathode of the diode D5 and the anode of the diode D6, the 9 pin of the operational amplifier UA is connected with the cathode of the diode D6 and one end of the resistor R25, the other end of the resistor R25 is connected with the anode of the diode D5 and one end of the 3 pin of the output interface U14 and one end of the resistor R26, the other end of the resistor R26 is connected with the anode of the electrolytic capacitor C11, and the cathode of the electrolytic capacitor C11 is grounded; two ends and three ends of the potentiometer R28 are respectively connected with one end of the ceramic capacitor C12 and the ground, and the other end of the ceramic capacitor C12 is connected with the 4-pin of the output interface U14.
The rectifying circuit and the operational amplifier circuit in the detection circuit 2 use different ports on the same integrated operational amplifier UC, the operational amplifier UC uses an AD827 operational amplifier, the dc voltage peak value extraction circuit, the dc voltage mean value extraction circuit, and the dc voltage valley value extraction circuit in the low frequency amplification circuit 3 and the signal output circuit 4 use different ports on the same integrated operational amplifier UA, and the operational amplifier UA uses an T L084 operational amplifier.
Further, the diodes D1, D2, D3, D4, D5 and D6 are diodes with the model number of 1N 60.
Further, in the low-frequency amplification circuit 3, the amplification factor of the low-frequency amplification can be controlled by adjusting the resistance value of the potentiometer R17.
A parameter extraction method of a broadcast monitoring receiver comprises signal input, rectification, signal amplification and filtering, low-frequency amplification, parameter extraction and audio output, and specifically comprises the following steps:
firstly, receiving a target intermediate frequency signal of which parameters need to be extracted by an input end of a detection circuit 2, sequentially performing rectification, signal amplification and filtering, and outputting the detected signal to a low-frequency amplification circuit 3;
secondly, the input end of the low-frequency amplification circuit 3 receives the signal from the output end of the detection circuit 2, performs low-frequency amplification, and outputs the signal after low-frequency amplification to the signal output circuit 4;
and thirdly, the input end of the signal output circuit 4 receives the signal from the output end of the low-frequency amplification circuit 3, and the peak voltage, the mean voltage, the valley voltage and the audio signal of the detection signal after low-frequency amplification are output through a direct-current voltage peak value extraction circuit, a direct-current voltage mean value extraction circuit, a direct-current voltage valley value extraction circuit and an audio output circuit in the signal output circuit 4.
The output terminal of the low frequency amplifier circuit in fig. 5 is connected to one terminal of R16 in the low frequency amplifier circuit in fig. 5, and the output terminal of the low frequency amplifier circuit in fig. 5 is connected to one terminal of R22 in the signal output circuit in fig. 6.
Referring to fig. 1, 2 and 7, a target intermediate frequency signal whose parameters need to be extracted is input to a receiving end of a detector circuit, i.e., one end of a resistor R10, sequentially passes through a rectifier circuit, an operational amplifier circuit and a filter circuit in the detector circuit, a connection point of a resistor R15 and a ceramic capacitor C8 is used as an output end, a detected signal is input to a receiving end of a low frequency amplifier circuit, i.e., one end of a resistor R16, the low frequency amplification factor is controlled by adjusting a potentiometer R17, a signal amplified at low frequency is input to a receiving end of a signal output circuit by using a pin 1 of an operational amplifier UA as an output end, and the signal amplified at low frequency sequentially outputs a peak voltage, a valley voltage, a peak voltage, and a peak voltage of the detected signal amplified at low frequency through a dc peak value extraction circuit, a dc voltage average value extraction circuit, a dc voltage valley value extraction, The average voltage and the audio signal.
The modulation degree of the broadcast amplitude modulation wave can be obtained by analyzing and calculating the extracted parameters of the peak voltage, the valley voltage and the mean voltage, and the parameters can also be used as feedback parameters of automatic gain control, for example, the extracted parameters of the mean voltage are returned to the input end of the local oscillation signal of the receiver, and the voltage value of the local oscillation signal can be controlled by judging whether the mean voltage exceeds a set threshold value, so that the output mean voltage is stabilized within the threshold range, and the purpose of automatic gain control is achieved. And the audio signal output by the signal output circuit is accessed into equipment such as a sound device and the like for playing.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (5)
1. A parameter extraction circuit of a broadcast supervisory receiver, characterized by: comprises a power circuit (1), a detection circuit (2), a low-frequency amplification circuit (3) and a signal output circuit (4),
the power supply circuit (1) is connected to the corresponding power supply ends of the detection circuit (2), the low-frequency amplification circuit (3) and the signal output circuit (4), the output end of the detection circuit (2) is connected with the input end of the low-frequency amplification circuit (3), the output end of the low-frequency amplification circuit (3) is connected with the input end of the signal output circuit (4), the power supply circuit (1) comprises a direct-current voltage source U1, the direct-current voltage source U1 can output direct-current voltages of +12V and-12V, the detection circuit (2) is used for rectifying, amplifying and filtering received target intermediate-frequency signals needing parameter extraction, the low-frequency amplification circuit (3) is used for performing low-frequency amplification on the signals processed by the detection circuit (2), and the signal output circuit (4) is used for extracting peak voltages, mean voltages, valley voltages and audio signals of the detection signals after low-frequency amplification;
the detector circuit (2) comprises resistors R10, R11, R12, R13, R14, R15, diodes D1 and D2, a ceramic capacitor C8 and an operational amplifier UC1, wherein the resistors R10, R11, R12, diodes D1, D2 and the operational amplifier UC1 form a rectifier circuit, the resistors R13, R14 and the operational amplifier UC1 form an operational amplifier circuit, the resistor R15 and the ceramic capacitor C8 form a filter circuit, the operational amplifiers used by the rectifier circuit and the operational amplifier circuit are different ports on the same integrated operational amplifier UC, and the operational amplifier UC adopts an operational amplifier with the model AD 827;
one end of the resistor R10 is connected with a target intermediate frequency signal of which the parameters need to be extracted, and the other end of the resistor R10 is connected with one end of the resistor R11, the anode of the diode D1 and the pin 2 of the negative input end of the operational amplifier UC 1; the other end of the resistor R11 is connected with the cathode of the diode D2, one end of the resistor R12 and one end of the resistor R13; the cathode of the diode D1 is connected to the anode of the diode D2 and the output terminal 1 pin of the operational amplifier UC1, and the positive input terminal 3 pin of the operational amplifier UC1 and the other end of R12 are grounded; the other end of the resistor R13 is connected to one end of R14 and the negative input terminal 6 pin of the operational amplifier UC 1; the other end of the R14 is connected to one end of a resistor R15 and a pin of an output terminal 7 of an operational amplifier UC1, and a pin of a positive input terminal 5 of the operational amplifier UC1 and one end of a ceramic capacitor C8 are grounded; the other end of the resistor R15 is connected with the other end of the ceramic capacitor C8, and the connection point is used as an output end to be connected into the low-frequency amplifying circuit (3);
the low-frequency amplification circuit (3) comprises resistors R16 and R18, a potentiometer R17 and an operational amplifier UA, wherein the operational amplifier UA adopts an operational amplifier with the model number of T L084, one end of the resistor R16 is connected with the output end of the detection circuit (2), the other end of the resistor R16 is connected with one end of the potentiometer R17 and the negative input end 2 pin of the operational amplifier UA, one end of the resistor R18 is grounded with the positive input end 3 pin of the operational amplifier UA, the power supply positive input end 4 pin and the power supply negative input end 11 pin of the operational amplifier UA are respectively connected with +12V and-12V of a direct current voltage source U1 in the power supply circuit (1), the two ends and the three ends of the potentiometer R17 are connected with the other end of the resistor R18 and the output end 1 pin of the operational amplifier UA, and the 1 pin of the operational amplifier UA is used as;
the signal output circuit (4) comprises resistors R, potentiometer R, an operational amplifier UA, wherein the operational amplifier UA adopts an operational amplifier with the model number of T084, diodes D, electrolytic capacitors C, ceramic capacitors C and an output interface U, wherein the resistors R, the diodes D, the operational amplifier UA and the electrolytic capacitors C form a direct current voltage peak value extraction circuit, the resistors R, the operational amplifier UA and the electrolytic capacitors C form a direct current voltage mean value extraction circuit, the resistors R, the diodes D, the operational amplifier UA and the electrolytic capacitors C form a direct current voltage valley value extraction circuit, and the resistor R, the potentiometer R and the ceramic capacitors C form an audio output circuit;
one ends of the resistors R19, R22, R24 and R27 are connected to be used as the input end of the signal output circuit (4) and receive the signal from the output end of the low-frequency amplifying circuit (3); the other ends of the resistors R19, R22, R24 and R27 are respectively connected with a pin 5 at the positive input end, a pin 12 at the positive input end, a pin 10 at the positive input end and one end of a potentiometer R28 of the operational amplifier UA; the output end 7 pin of the operational amplifier UA is connected with the anode of the diode D3 and the cathode of the diode D4, the negative input end 6 pin of the operational amplifier UA is connected with the anode of the diode D4 and one end of the resistor R20, the other end of the resistor R20 is connected with the cathode of the diode D3, the 1 pin of the output interface U14 and one end of the resistor R21, the other end of the resistor R21 is connected with the anode of the electrolytic capacitor C9, and the cathode of the electrolytic capacitor C9 is grounded; the pin of the negative input end 13 of the operational amplifier UA is connected with the pin of the output end 14 of the operational amplifier UA and one end of a resistor R23, the other end of the resistor R23 is connected with the pin 2 of an output interface U14 and the anode of an electrolytic capacitor C10, and the cathode of the electrolytic capacitor C10 is grounded; the pin 8 of the output end of the operational amplifier UA is connected with the cathode of the diode D5 and the anode of the diode D6, the pin 9 of the negative input end of the operational amplifier UA is connected with the cathode of the diode D6 and one end of the resistor R25, the other end of the resistor R25 is connected with the anode of the diode D5, the pin 3 of the output interface U14 and one end of the resistor R26, the other end of the resistor R26 is connected with the anode of the electrolytic capacitor C11, and the cathode of the electrolytic capacitor C11 is grounded; two ends and three ends of the potentiometer R28 are respectively connected with one end of the ceramic capacitor C12 and the ground, and the other end of the ceramic capacitor C12 is connected with the 4-pin of the output interface U14.
2. The parameter extraction circuit of a broadcast supervisory receiver as claimed in claim 1, wherein: the diodes D1 and D2 are 1N 60.
3. The parameter extraction circuit of a broadcast supervisory receiver as claimed in claim 1, wherein: the diodes D3, D4, D5 and D6 are 1N 60.
4. The parameter extraction circuit of a broadcast supervisory receiver as claimed in claim 1, wherein: the amplification factor of the low-frequency amplification can be controlled by adjusting the resistance value of the potentiometer R17 in the low-frequency amplification circuit (3).
5. A method for extracting parameters of a broadcast supervisory receiver, which is performed by the parameter extraction circuit of the broadcast supervisory receiver according to claim 1, wherein: the method comprises the following steps:
firstly, receiving a target intermediate frequency signal of which parameters need to be extracted by an input end of a detection circuit (2), sequentially rectifying, amplifying and filtering the target intermediate frequency signal, and outputting the detected signal to a low-frequency amplification circuit (3);
secondly, the input end of the low-frequency amplification circuit (3) receives a signal from the output end of the detection circuit (2), performs low-frequency amplification, and outputs the signal after the low-frequency amplification to a signal output circuit (4);
and thirdly, the input end of the signal output circuit (4) receives the signal from the output end of the low-frequency amplification circuit (3), and the peak voltage, the mean voltage, the valley voltage and the audio signal of the detection signal after low-frequency amplification are output through a direct-current voltage peak value extraction circuit, a direct-current voltage mean value extraction circuit, a direct-current voltage valley value extraction circuit and an audio output circuit in the signal output circuit (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611099397.XA CN106656363B (en) | 2016-12-02 | 2016-12-02 | Parameter extraction circuit of broadcast monitoring receiver and parameter extraction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611099397.XA CN106656363B (en) | 2016-12-02 | 2016-12-02 | Parameter extraction circuit of broadcast monitoring receiver and parameter extraction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106656363A CN106656363A (en) | 2017-05-10 |
| CN106656363B true CN106656363B (en) | 2020-07-31 |
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