CN214014238U - Frequency calibration system and device - Google Patents
Frequency calibration system and device Download PDFInfo
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- CN214014238U CN214014238U CN202023077662.9U CN202023077662U CN214014238U CN 214014238 U CN214014238 U CN 214014238U CN 202023077662 U CN202023077662 U CN 202023077662U CN 214014238 U CN214014238 U CN 214014238U
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Abstract
The utility model provides a frequency calibration system and device, include: the device comprises an antenna module, a low-noise amplification and frequency division module, an MCU detection and control module and an LCD display module; the antenna module is used for receiving the frequency signal and sending the frequency signal to the low-noise amplification and frequency division module; the low-noise amplification and frequency division module is used for receiving the frequency signal, generating a square wave signal after amplifying, frequency dividing and filtering the frequency signal, and sending the square wave signal to the MCU detection and control module; the MCU detection and control module is used for receiving the square wave signal, and then generating calibration data after internal calculation and error code processing are carried out on the square wave signal; and the LCD display module is used for displaying the calibration data generated by the MCU detection and control module. The frequency calibration system and the device integrate a high-performance receiver, a baseband, a singlechip and a control circuit thereof. Whole small, intelligent calibration frequency is accurate fast, the wide application is in other intercom equipment such as intercom.
Description
Technical Field
The utility model relates to a wireless communication technology field, in particular to frequency calibration system and device.
Background
With the popularization of wireless communication interphones, remote controllers and other products, manufacturers still rely on comprehensive testers and manual work to debug and calibrate the working frequency of the products at present, and the production speed is slow, the error is large, and the cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a frequency calibration system and device solves the drawback that relies on integrated tester and artifical debugging calibration product at present, provides a high integration and complete machine is small, and calibration frequency is accurate fast, can wide application in the intelligent frequency calibration system and the device of intercom and other intercom equipment.
In order to achieve the above object, the present invention provides the following technical solutions:
a frequency calibration system, comprising: the device comprises an antenna module 1, a low-noise amplification and frequency division module 2, an MCU detection and control module 3 and an LCD display module 4;
the antenna module 1 is configured to receive a frequency signal and send the frequency signal to the low-noise amplification and frequency division module 2;
the low-noise amplification and frequency division module 2 is used for receiving a frequency signal, generating a square wave signal after amplifying, frequency dividing and filtering the frequency signal, and sending the square wave signal to the MCU detection and control module 3;
the MCU detection and control module 3 is used for receiving the square wave signal, and then carrying out internal calculation and error code processing on the square wave signal to generate calibration data;
and the LCD display module 4 is used for displaying the calibration data generated by the MCU detection and control module 3.
Preferably, the system also comprises a high-frequency baseband chip, a transceiver module 5 and an audio power amplifier module 6;
the high-frequency baseband chip and transceiver module 5 is configured to receive a frequency signal, check the frequency signal, convert the frequency signal into an audio signal, and transmit the audio signal to the audio power amplifier module;
and the audio power amplifier module 6 is used for receiving the audio signal and amplifying the audio signal and then sending the amplified audio signal.
Preferably, the low-noise amplifying and frequency dividing module comprises a low-noise amplifier 21, a frequency divider 22 and a filter 23, and the frequency divider 22 is respectively connected with the amplifier 21 and the filter 23 through signals;
the low noise amplifier 21 is in signal connection with the antenna module 1, and the filter 23 is in signal connection with the MCU detection and control module 3.
A frequency calibration apparatus including the frequency calibration system according to any one of the above embodiments, comprising: the device comprises an antenna module 1, a low-noise amplification and frequency division module 2, an MCU detection and control module 3 and an LCD display module 4;
the antenna module 1 is in signal connection with the low-noise amplification and frequency division module 2, and the MCU detection and control module 3 is in signal connection with the low-noise amplification and frequency division module 2 and the LCD display module 4 respectively;
the antenna module 1 is configured to receive a frequency signal and send the frequency signal to the low-noise amplification and frequency division module 2;
the low-noise amplification and frequency division module 2 is used for receiving a frequency signal, generating a square wave signal after amplifying, frequency dividing and filtering the frequency signal, and sending the square wave signal to the MCU detection and control module 3;
the MCU detection and control module 3 is used for receiving the square wave signal, and then carrying out internal calculation and error code processing on the square wave signal to generate calibration data;
the LCD display module 4 is used for displaying the calibration data generated by the MCU detection and control module 3;
preferably, the system also comprises a high-frequency baseband chip, a transceiver module 5 and an audio power amplifier module 6,
the high-frequency baseband chip and transceiver module 5 is configured to receive a frequency signal, check the frequency signal, convert the frequency signal into an audio signal, and transmit the audio signal to the audio power amplifier module 6;
and the audio power amplifier module 6 is used for receiving the audio signal and amplifying the audio signal and then sending the amplified audio signal.
Preferably, the low-noise amplification and frequency division module 2 comprises a low-noise amplifier 21, a frequency divider 22 and a filter 23, wherein the frequency divider 22 is in signal connection with the amplifier 21 and the filter 23 respectively;
the low noise amplifier is in signal connection with the antenna module 1, and the filter 23 is in signal connection with the MCU detection and control module 3.
Through implementing above technical scheme, have following technological effect: the utility model provides a frequency calibration system and device, the utility model provides a frequency calibration device supplies power through USB 5V or DC 7V-15V, and this device has integrateed high performance receiver, baseband, singlechip and control circuit. Whole small, intelligent calibration frequency is accurate fast, the wide application is in other intercom equipment such as intercom.
Drawings
Fig. 1 is a schematic block diagram of a frequency calibration system provided by the present invention;
fig. 2 is a schematic block diagram of a frequency calibration system provided by the present invention;
fig. 3 is a schematic diagram of internal components of the frequency calibration device provided by the present invention.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed description of the embodiments provided in the present invention is provided with reference to the accompanying drawings.
A frequency calibration system, as shown in figures 1-2, comprising: the system comprises an antenna module 1, a low-noise amplification and frequency division module 2, an MCU (micro control unit) detection and control module 3 and an LCD (liquid crystal display) display module 4; the antenna module 1 is used for receiving a frequency signal of a device to be tested and sending the frequency signal to the low-noise amplification and frequency division module 2; the low-noise amplification and frequency division module 2 is used for receiving a frequency signal, generating a square wave signal after amplifying, frequency dividing and filtering the frequency signal, and sending the square wave signal to the MCU (micro control unit) detection and control module 3; the MCU (micro control unit) detection and control module 3 is used for receiving the square wave signal, and then carrying out internal calculation and error code processing on the square wave signal to generate calibration data; and the LCD (liquid crystal display) display module 4 is used for displaying the calibration data generated by the MCU (micro control unit) detection and control module 3.
In this embodiment, as shown in fig. 3, the specific technical solution is as follows: the signal received by the antenna end is amplified by Q1 or Q6 with low noise and then input to the input end of the frequency divider U8, and the signal is input to Q7 after frequency division and then transformed into square wave, and then the square wave is provided for MCU (micro control unit) to detect and calculate. The frequency calibration system and the calibration device provided by the embodiment comprise two effective frequency modes, one is an addition/subtraction regulation mode through an IO port control key, and the other is a UART serial port data transmission regulation mode. When an IO port control key adding/subtracting regulation mode, namely an IO port pulse mode, is selected, a 31 th pin of an MCU (micro control unit) is connected to the output end of the square wave shaping, the shaped square wave controls the number of output pulses of Q4 and Q3 after internal calculation and error code processing of the MCU (micro control unit), and Q4 and Q3 are externally connected with adding and subtracting keys of the tested intercom device, so that the error calibration of the frequency is realized. In this embodiment, preferably, the LCD (liquid crystal display) display screen module is composed of an LCD1602, the LCD1602 is connected to an MCU (micro control unit), and the MCU (micro control unit) controls information to be displayed. The display information mainly comprises a reference frequency to be calibrated currently, an error value between the frequency of the current tested intercom device and the reference frequency, and an OK or NG prompt displayed after the calibration is finished. The audio power amplifier module is composed of U4 and peripheral devices, the input end is connected with the audio demodulation output pin of the baseband IC (chip), and the audio signal knot pushes the loudspeaker to make sound after amplification. And detecting whether the tested machine has modulation and the distortion degree of the signal. In this embodiment, the tested intercom device is preferably an intercom, and the connection with the tested intercom device is specifically performed in the following manner, where the antenna test point of the tested intercom device PCBA is connected from the ANT port of the calibration device provided in this embodiment through the radio frequency shielding line. The UP port of the calibration device of the present embodiment is connected to the UP key during the frequency modulation of the intercom via a wire, the DOWN port is connected to the DOWN key during the frequency modulation of the intercom, and the GND port is connected to the ground wire of the intercom. The specific operation mode is that a frequency calibration mode key of the tester is pressed for a short time on the starting interface, the device enters a frequency calibration mode, the PCBA of the tested interphone enters a frequency modulation mode, and the device reads the interphone frequency and compares the interphone frequency with the originally set center frequency of the device. The device can automatically calculate the frequency error (the current transmitting frequency and the error frequency of the tested interphone can be displayed above the display screen). When the center frequency of the interphone is higher than the center frequency of the equipment, the equipment can automatically control the interphone to reduce the frequency through the DOWN port. When the center frequency of the interphone is lower than that of the equipment, the equipment can automatically control the interphone to increase the frequency through the UP port. When the central frequency of the buzzer is adjusted to be less than +/-500 HZ, the debugging is automatically stopped, the display screen prompts OK, and the buzzer clicks one time. And after the frequency correction is finished, taking out the interphone plate, placing a second interphone plate in the same way, and enabling the interphone to enter a frequency modulation mode to continue automatic frequency modulation.
When a UART serial port data sending regulation mode is selected, namely a UART serial port (data packet) mode, a 31 th pin of an MCU (micro control unit) is connected to the output end of the square wave shaping, the shaped square wave is subjected to internal calculation and error code processing of the MCU (micro control unit), and then the data packet is directly sent to the MCU (micro control unit) of the tested machine through a USB connecting line, so that the error calibration of the frequency is realized. Specifically, the test point is connected to the intercom to be tested through the radio frequency shielding line from the ANT port of the calibration device provided in this embodiment. The calibration device provided by the specific implementation is used for connecting the TXD with the RXD of the intercom to be tested through a USB interface, the RXD is connected with the TXD of the intercom to be tested, and the GND is connected with the GND of the intercom to be tested. The specific operation mode is that the frequency calibration mode key of the tester is pressed for a short time on the starting interface, and the calibration device enters the frequency calibration mode. The interphone sends an instruction to enter a debugging mode through the serial port (the interphone supports the serial port debugging function), and the calibrating device reads that the interphone frequency can be compared with the center frequency originally set by the calibrating device. After the calibration device automatically calculates the frequency error frequency, the error value is directly written into the interphone MCU through the serial port. After writing, the device reads the frequency of the interphone again, the debugging is automatically stopped when the center frequency of the interphone is smaller than the range of +/-500 HZ, the display screen prompts OK, and meanwhile, the buzzer clicks one sound. And after frequency correction is finished, taking out the interphone plate. The second interphone plate is placed in the same way, and the automatic frequency modulation can be continued by pressing the PTT key for a short time. And the short-press frequency correction mode key exits the current mode.
On the basis of the above embodiment, in other embodiments, the wireless communication device further includes a high-frequency baseband chip and transceiver module 5 and an audio power amplifier module 6; the high-frequency baseband chip and transceiver module 5 is configured to receive a frequency signal, check the frequency signal, convert the frequency signal into an audio signal, and transmit the audio signal to the audio power amplifier module; and the audio power amplifier module 6 is used for receiving the audio signal and amplifying the audio signal and then sending the amplified audio signal. On the basis of the above embodiment, it is preferable that the low noise amplifying and frequency dividing module includes a low noise amplifier 21, a frequency divider 22 and a filter 23, and the frequency divider 22 is respectively connected to the amplifier 21 and the filter 23; the low noise amplifier 21 is in signal connection with the antenna module 1, and the filter 23 is in signal connection with the MCU detection and control module 3.
The embodiment of the utility model provides a still provide a frequency calibration device, including any of the above-mentioned specific embodiments frequency calibration system, a serial communication port, include: the device comprises an antenna module 1, a low-noise amplification and frequency division module 2, an MCU detection and control module 3 and an LCD display module 4; the antenna module 1 is in signal connection with the low-noise amplification and frequency division module 2, and the MCU detection and control module 3 is in signal connection with the low-noise amplification and frequency division module 2 and the LCD display module 4 respectively; the antenna module 1 is used for receiving a frequency signal of a device to be tested and sending the frequency signal to the low-noise amplification and frequency division module 2; the low-noise amplification and frequency division module 2 is used for receiving a frequency signal, generating a square wave signal after amplifying, frequency dividing and filtering the frequency signal, and sending the square wave signal to the MCU detection and control module 3; the MCU detection and control module 3 is used for receiving the square wave signal, and then carrying out internal calculation and error code processing on the square wave signal to generate calibration data; the LCD display module 4 is used for displaying the calibration data generated by the MCU detection and control module 3;
on the basis of the above embodiment, in other embodiments, the wireless communication device further includes a high-frequency baseband chip and transceiver module 5 and an audio power amplifier module 6, where the high-frequency baseband chip and transceiver module 5 is configured to receive a frequency signal, check the frequency signal, convert the frequency signal into an audio signal, and transmit the audio signal to the audio power amplifier module 6; and the audio power amplifier module 6 is used for receiving the audio signal and amplifying the audio signal and then sending the amplified audio signal.
On the basis of the above embodiment, in other embodiments, furthermore, the low-noise amplifying and frequency dividing module 2 includes a low-noise amplifier 21, a frequency divider 22 and a filter 23, where the frequency divider 22 is respectively connected to the amplifier 21 and the filter 23 by signals; the low noise amplifier is in signal connection with the antenna module 1, and the filter 23 is in signal connection with the MCU detection and control module 3.
In this embodiment, the operation mode of the calibration device provided by the utility model is that the antenna test point of the tested interphone PCBA is connected from the ANT port of the calibration device through the radio frequency shielding wire; connecting a PTT port of the calibration device with a PTT key of a PCBA of the tested interphone through a wire; connecting the TONE port of the calibrating device with the MIC + test point of the tested interphone PCBA through a wire; a loudspeaker (16 omega) is required to be externally connected between the SPK + and the SPK-ports of the calibration device. Then, after the interphone is connected with the calibration device, the interphone is normally started (does not enter a frequency modulation mode), the startup interface of the calibration device presses a test mode key for a short time, and the test mode interface is entered to display Auto Testing, so that the channel frequency of the interphone is ensured to be consistent with the equipment frequency. A short press of the test mode key will exit the current mode. After the calibration device enters the test mode interface, the device is already in an RX test state (it is ensured that the PTT port and the TONE port of the device are connected to the intercom respectively). The PTT port of the calibration device can automatically control the interphone to enter the transmitting state, and meanwhile, the TONE port can generate 1KHZ audio frequency to be modulated through the MIC + of the interphone. When the calibration device receives the signal sent by the interphone, the loudspeaker of the calibration device can send out 1KHZ audio sound (the loudspeaker is connected between the SPK + and SPK-ports of the equipment is ensured), which indicates that the transmitting path of the interphone is normal. The calibration device enters a TX test state (the interphone is automatically switched to an RX state after the PTT key is pressed) when the PTT key on the panel is not pressed, and at the moment, 1KHZ audio frequency generated in the calibration device is transmitted to the interphone to be received through radio frequency. The tested interphone sends out 1KHZ audio sound from the loudspeaker after receiving the signal demodulation (ensuring that the tested interphone is connected with the loudspeaker). The receiving channel of the interphone is normal. And releasing the RX test state of the PTT key cut off, and taking out the interphone PCB. A second PCB board was tested in the same manner. And the current mode is exited by pressing the test mode key for a short time.
In this embodiment, the frequency calibration device further includes a frequency sweep mode, and the frequency sweep mode is first connected to the PCBA antenna test point of the tested interphone from the ANT port of the calibration device through the radio frequency shielding line. The equipment starting interface enters a frequency sweep mode interface (a common frequency meter function) by pressing a frequency sweep mode key for a short time. The frequency range of 20 MHZ-800 MHZ can be read in the frequency sweep mode without being limited by the measured center frequency, and the current mode is exited by short pressing of the frequency sweep mode key.
The above is to the frequency calibration system and device provided by the embodiments of the present invention described in detail, and to the general technical personnel in the field, according to the embodiments of the present invention, there are all the changes on the specific implementation and the application scope, to sum up, the content of this specification should not be understood as the limitation of the present invention.
Claims (6)
1. A frequency calibration system, comprising: the device comprises an antenna module (1), a low-noise amplification and frequency division module (2), an MCU detection and control module (3) and an LCD display module (4);
the antenna module (1) is used for receiving a frequency signal and sending the frequency signal to the low-noise amplification and frequency division module (2);
the low-noise amplification and frequency division module (2) is used for receiving a frequency signal, then generating a square wave signal after amplifying, frequency dividing and filtering the frequency signal, and sending the square wave signal to the MCU detection and control module (3);
the MCU detection and control module (3) is used for receiving the square wave signal, and then carrying out internal calculation and error code processing on the square wave signal to generate calibration data;
and the LCD display module (4) is used for displaying the calibration data generated by the MCU detection and control module (3).
2. The frequency calibration system of claim 1, further comprising a high frequency baseband chip and transceiver module (5) and an audio power amplifier module (6);
the high-frequency baseband chip and transceiver module (5) is used for receiving a frequency signal, checking the frequency signal, converting the frequency signal into an audio signal and transmitting the audio signal to the audio power amplifier module;
and the audio power amplifier module (6) is used for receiving the audio signal and amplifying the audio signal and then sending the amplified audio signal.
3. The frequency calibration system of claim 1, wherein the low noise amplification and frequency division module comprises a low noise amplifier (21), a frequency divider (22) and a filter (23), the frequency divider (22) being in signal connection with the amplifier (21) and the filter (23), respectively;
the low noise amplifier (21) is in signal connection with the antenna module (1), and the filter (23) is in signal connection with the MCU detection and control module (3).
4. A frequency calibration device comprising the frequency calibration system of any one of claims 1 to 3, comprising: the device comprises an antenna module (1), a low-noise amplification and frequency division module (2), an MCU detection and control module (3) and an LCD display module (4);
the antenna module (1) is in signal connection with the low-noise amplification and frequency division module (2), and the MCU detection and control module (3) is in signal connection with the low-noise amplification and frequency division module (2) and the LCD display module (4) respectively;
the antenna module (1) is used for receiving a frequency signal and sending the frequency signal to the low-noise amplification and frequency division module (2);
the low-noise amplification and frequency division module (2) is used for receiving a frequency signal, then generating a square wave signal after amplifying, frequency dividing and filtering the frequency signal, and sending the square wave signal to the MCU detection and control module (3);
the MCU detection and control module (3) is used for receiving the square wave signal, and then carrying out internal calculation and error code processing on the square wave signal to generate calibration data;
and the LCD display module (4) is used for displaying the calibration data generated by the MCU detection and control module (3).
5. The frequency calibration device according to claim 4, further comprising a high frequency baseband chip and transceiver module (5) and an audio power amplifier module (6),
the high-frequency baseband chip and transceiver module (5) is used for receiving a frequency signal, checking the frequency signal, converting the frequency signal into an audio signal and transmitting the audio signal to the audio power amplifier module (6);
and the audio power amplifier module (6) is used for receiving the audio signal and amplifying the audio signal and then sending the amplified audio signal.
6. The frequency calibration device according to claim 5, wherein the low-noise amplification and frequency division module (2) comprises a low-noise amplifier (21), a frequency divider (22) and a filter (23), the frequency divider (22) being in signal connection with the amplifier (21) and the filter (23), respectively;
the low noise amplifier is in signal connection with the antenna module (1), and the filter (23) is in signal connection with the MCU detection and control module (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023077662.9U CN214014238U (en) | 2020-12-19 | 2020-12-19 | Frequency calibration system and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023077662.9U CN214014238U (en) | 2020-12-19 | 2020-12-19 | Frequency calibration system and device |
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| CN214014238U true CN214014238U (en) | 2021-08-20 |
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| CN202023077662.9U Active CN214014238U (en) | 2020-12-19 | 2020-12-19 | Frequency calibration system and device |
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