CN202013492U - Electric wave time signal acquisition device - Google Patents
Electric wave time signal acquisition device Download PDFInfo
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- CN202013492U CN202013492U CN 201020700582 CN201020700582U CN202013492U CN 202013492 U CN202013492 U CN 202013492U CN 201020700582 CN201020700582 CN 201020700582 CN 201020700582 U CN201020700582 U CN 201020700582U CN 202013492 U CN202013492 U CN 202013492U
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Abstract
The utility model relates to an electric wave time signal acquisition device, which comprises a receiving circuit and a demodulator circuit. The receiving circuit is used for processing received analogue amplitude modulation electric wave time signals to obtain digital amplitude modulation electric wave time signals. The demodulator circuit is connected with the receiving circuit and used for demodulating the digital amplitude modulation electric wave time signals to obtain the electric wave time signals. The electric wave time signal acquisition device can improve reliability of receiving and demodulating remote communication complex (RCC) signals.
Description
Technical field
The utility model relates to microelectronic, relates in particular to a kind of device that obtains the electric wave time signal.
Background technology
Along with science and technology development, occurred electric wave to the time technology.Electric wave to the time technology refer to and adopt the electric wave time service (Radio Controlled Clock is called for short: the RCC) technology of signal correction time.Carry date and Hour Minute Second equal time information in the RCC signal because the temporal information of carrying is very accurate in the RCC signal, therefore adopt electric wave to the time time behind the correction of typist's errors also very accurate.The time encoding mode and the transmission carrier frequency of the RCC signal that various countries adopt are not quite similar, and are example with China, and time encoding adopts the BPC sign indicating number, and transmission carrier frequency is 68.5kHz.
Because the raising of people's consumption demand, in common radio, add electric wave to the time function also popularizing gradually.Adopt simulation reception and demodulation method to obtain the RCC signal in the present common radio.But the reliability of simulation reception and demodulation method is relatively poor.
The utility model content
The utility model provides a kind of device that obtains the electric wave time signal, in order to realize that improving the RCC signal receives and demodulation reliability.
The utility model provides a kind of device that obtains the electric wave time signal, comprising:
Receiving circuit is used for the analog AM electric wave time signal that receives handled obtaining digital am electric wave time signal;
Demodulator circuit is connected with described receiving circuit, is used for that described digital am electric wave time signal is carried out demodulation process and obtains the electric wave time signal.
In the utility model, the analog AM RCC signal that receives handled obtain digital am RCC signal, digital am RCC signal is carried out demodulation process obtain the RCC signal, thereby adopt digital processing method to obtain the RCC signal, because, therefore having improved the RCC signal than the reliability height of simulation process method, digital processing method receives and demodulation reliability.
Description of drawings
Fig. 1 obtains the structural representation of device first embodiment of RCC signal for the utility model;
Fig. 2 obtains the structural representation of device second embodiment of RCC signal for the utility model;
Fig. 3 obtains the structural representation of device the 3rd embodiment of RCC signal for the utility model.
Embodiment
The utility model will be further described below in conjunction with specification drawings and specific embodiments.
As shown in Figure 1, for the utility model obtains the structural representation of device first embodiment of RCC signal, can comprise receiving circuit 11 and demodulator circuit 12, demodulator circuit 12 is connected with receiving circuit 11.
Wherein, receiving circuit 11 is used for the analog AM RCC signal that receives handled and obtains digital am RCC signal.Demodulator circuit 12 is used for that digital am RCC signal is carried out demodulation process and obtains the RCC signal.
In the present embodiment, the analog AM RCC signal of 11 pairs of receptions of receiving circuit is handled and is obtained digital am RCC signal, 12 couples of digital am RCC of demodulator circuit signal carries out demodulation process and obtains the RCC signal, thereby adopt digital processing method to obtain the RCC signal, because digital processing method is than the reliability height of simulation process method, so present embodiment has improved reception of RCC signal and demodulation reliability.
As shown in Figure 2, obtain the structural representation of device second embodiment of RCC signal for the utility model, on the basis of reception synoptic diagram shown in Figure 1, digital am RCC signal is a baseband signal, receiving circuit 11 can comprise antenna 1101, simulation quadrature mixting circuit 1102, orthogonal simulation local oscillation circuit 1103, first simulation low-pass filter (Analog Low Pass Filter, be called for short: ALPF) 1105, second simulation low-pass filter 1106, first analog to digital converter (Analog-to-Digital Converter, be called for short: ADC) 1107, second analog to digital converter 1108, digital quadrature mixing circuit 1109, orthogonal digital local oscillation circuit 1110, (Digital Low Pass Filter is called for short: DLPF) 1,112 first wave digital lowpass filter, second wave digital lowpass filter 1113.
Simulation quadrature mixting circuit 1102 is connected with antenna 1101, and the output terminal of simulation quadrature mixting circuit 1102 comprises the first output branch road and the second output branch road; Orthogonal simulation local oscillation circuit 1103 is connected with simulation quadrature mixting circuit 1102; First simulation low-pass filter 1105 is connected with the first output branch road; Second simulation low-pass filter 1106 is connected with the second output branch road; First analog to digital converter 1107 is connected with first simulation low-pass filter 1105; Second analog to digital converter 1108 is connected with second simulation low-pass filter 1106; Digital quadrature mixing circuit 1109 is connected with second analog to digital converter 1108 with first analog to digital converter 1107, and the output terminal of digital quadrature mixing circuit 1109 comprises the 3rd output branch road and the 4th output branch road; Orthogonal digital local oscillation circuit 1110 is connected with digital quadrature mixing circuit 1109; One end of first wave digital lowpass filter 1112 is connected with the 3rd output branch road, and the other end is connected with demodulator circuit 12; One end of second wave digital lowpass filter 1113 is connected with the 4th output branch road, and the other end is connected with demodulator circuit 12.
Alternatively,, improve the performance of receiving circuit 11 for filtering noise, receiving circuit 11 can also comprise low noise amplifier (Low Noise Amplifier, be called for short: LNA) 1114, be connected between antenna 1101 and the simulation quadrature mixting circuit 1102.
In receiving circuit 11, the analog AM RCC signal that 1114 pairs of antennas of low noise amplifier 1101 receive amplifies, and sends to simulation quadrature mixting circuit 1102 then.Orthogonal simulation local oscillation circuit 1103 produces two simulation local oscillated signals, and the phase differential of these two simulation local oscillated signals is 90 °.Simulation quadrature mixting circuit 1102 receives through the analog AM RCC signal of processing and amplifying and two simulation local oscillated signals and will export to first simulation low-pass filter 1105 and second simulation low-pass filter 1106 by the first output branch road and the second output branch road respectively after its mixing, through sending to first analog to digital converter 1107 behind first simulation low-pass filter 1105, obtain a digital medium-frequency signal, the frequency of this digital medium-frequency signal is F
IF, through sending to second analog to digital converter 1108 behind second simulation low-pass filter 1106, obtaining digital medium-frequency signal, the centre frequency of this digital medium-frequency signal is F
IFThe two-way digital medium-frequency signal sends to digital quadrature mixing circuit 1109.Orthogonal digital local oscillation circuit 1110 produces two digital local oscillated signals, and the frequency of these two digital local oscillated signals is F
IFAnd phase differential is 90 °.Digital quadrature mixing circuit 1109 receives two-way digital medium-frequency signal and two digital local oscillated signals and will send to first wave digital lowpass filter 1112 and second wave digital lowpass filter 1113 by the 3rd output branch road and the 4th output branch road respectively after its mixing, after the low-pass filtering through first wave digital lowpass filter 1112, obtain a way word signal, this way word signal is the I road signal of digital quadrature amplitude modulation RCC signal, after the low-pass filtering through second wave digital lowpass filter 1113, obtain a way word signal, this way word signal is the Q road signal of digital quadrature amplitude modulation RCC signal.This digital quadrature amplitude modulation RCC signal is a baseband signal, and this digital quadrature amplitude modulation RCC signal sends to demodulator circuit 12.
Alternatively, receiving circuit 11 includes only antenna 1101, simulation quadrature mixting circuit 1102, orthogonal simulation local oscillation circuit 1103, first simulation low-pass filter 1105, second simulation low-pass filter 1106, first analog to digital converter 1107, second analog to digital converter 1108.
Alternatively, receiving circuit 11 comprises antenna, at least one local oscillation circuit, at least one mixting circuit that is connected in series, at least two low-pass filters and at least one analog to digital converter.Comprise at least one quadrature local oscillation circuit at least one local oscillation circuit, at least one mixting circuit is connected with at least one local oscillation circuit with antenna, comprise at least one quadrature mixting circuit at least one mixting circuit, at least one quadrature local oscillation circuit and at least one quadrature mixting circuit connect one to one; Each output branch road of the output terminal of mixting circuit is connected with a low-pass filter; The input end of arbitrary mixting circuit or each of output terminal output branch road are connected with an analog to digital converter.
Further, in the present embodiment, demodulator circuit 12 can comprise circuit for calculating energy of orthogonal signal 121, Threshold detection circuit 122 and compare decision device 123.
Circuit for calculating energy of orthogonal signal 121 is connected with receiving circuit 11, and particularly, circuit for calculating energy of orthogonal signal 121 is connected with second wave digital lowpass filter 1113 with first wave digital lowpass filter 1112; Threshold detection circuit 122 is connected with circuit for calculating energy of orthogonal signal 121; Relatively decision device 123 is connected with circuit for calculating energy of orthogonal signal 121 with Threshold detection circuit 122.
Alternatively, in order to improve the performance of demodulator circuit 12, demodulator circuit 12 can also comprise that narrow band filter 124, one ends are connected with circuit for calculating energy of orthogonal signal 121, and the other end is connected with comparison decision device 123 with Threshold detection circuit 122.
In the present embodiment, circuit for calculating energy of orthogonal signal 121 is used for obtaining according to following formula the energy signal of digital quadrature amplitude modulation RCC signal:
I
2+Q
2
Wherein, I is the I road signal of each discrete signal of digital quadrature amplitude modulation RCC baseband signal, and Q is the Q road signal of each discrete signal in the digital quadrature amplitude modulation RCC baseband signal.Threshold detection circuit 122 is used for obtaining the threshold value of each discrete signal of energy signal.Relatively decision device 123 is used for according to threshold value energy signal being adjudicated, and obtains the RCC signal.Preferably, when the discrete signal of energy signal during greater than its threshold value, decision device 123 output datas 1 relatively, when the discrete signal of energy signal is less than or equal to its threshold value, decision device 123 output datas 0 relatively.
Preferably, the threshold value of discrete signal can obtain according to the maximal value of the energy signal in the schedule time window, and preferably, this maximal value rollback 3dB is as the threshold value of this discrete signal; Alternatively, the threshold value of this discrete signal can also be the mean value of the energy signal in the schedule time window.This schedule time window can be selected according to actual conditions, for example: 0.5 second, 1 second or 2 seconds or the like.
In demodulator circuit 12, at first obtain energy signal through circuit for calculating energy of orthogonal signal 121, pass through narrow band filter 124 again, out-of-band noise is further suppressed.Threshold detection circuit 122 detects the threshold value of each discrete signal in the energy signal, and relatively decision device 123 compares judgement to energy signal and obtains the RCC signal according to threshold value then.Relatively decision device 123 is given peripheral MCU with the RCC signal, and peripheral MCU decodes to this RCC signal according to the agreement of time encoding, can obtain temporal information.
Further, in the present embodiment, Threshold detection circuit 122 can comprise time window counter 1221, maximum value detecting circuit 1222 and thresholding counting circuit 1223.Time window counter 1221 is connected with narrow band filter 124; Maximum value detecting circuit 1222 is connected with time window counter 1221; One end of thresholding counting circuit 1223 is connected with maximum value detecting circuit 1222, and the other end is connected with comparison decision device 123.Alternatively, time window counter 1221 can also directly be connected with circuit for calculating energy of orthogonal signal 121.
Further, in the present embodiment, receiving circuit 11 and demodulator circuit 12 can be integrated on the chip.
In the present embodiment, the analog AM RCC signal of 11 pairs of receptions of receiving circuit is handled and is obtained digital am RCC signal, 12 couples of digital am RCC of demodulator circuit signal carries out demodulation process and obtains the RCC signal, thereby adopt digital processing method to obtain the RCC signal, because digital processing method is than the reliability height of simulation process method, so present embodiment has improved reception of RCC signal and demodulation reliability.
As shown in Figure 3, obtain the structural representation of device the 3rd embodiment of RCC signal for the utility model, on the basis of structural representation shown in Figure 1, receiving circuit 11 can comprise that (External Crystal Oscillator is called for short: XTAL) 1120 and frequency multiplier circuit 1121 for antenna 1101, first Analogue mixer 1115, first bandpass filter 1116, second Analogue mixer 1117, second bandpass filter 1118, the 3rd analog to digital converter 1119, external crystal oscillator.
Wherein, first Analogue mixer 1115 is connected with frequency multiplier circuit 1121 with antenna 1101, and frequency multiplier circuit 1121 is connected with external crystal oscillator 1120.First bandpass filter 1116 is connected with first Analogue mixer 1115, second Analogue mixer 1117 is connected with external crystal oscillator 1120 with first bandpass filter 1116, second bandpass filter 1118 is connected with second Analogue mixer 1117, and the 3rd analog to digital converter 1119 is connected with second bandpass filter 1118.
Alternatively, in order to improve the performance of receiving circuit 11, receiving circuit 11 can also comprise that (Variable Gain Amplifier is called for short: VGA) 1123 and second variable gain amplifier 1124 for the 3rd bandpass filter 1122, first variable gain amplifier.Wherein, the 3rd bandpass filter 1122 is connected between the antenna 1101 and first Analogue mixer 1115, first variable gain amplifier 1123 is connected between first bandpass filter 1116 and second Analogue mixer 1117, and second variable gain amplifier 1124 is connected between second bandpass filter 1118 and the 3rd analog to digital converter 1119.
Further, in the present embodiment, demodulator circuit 12 can comprise digital carrier restoring circuit 124, digital mixer 125, wave digital lowpass filter 126, decision circuit 127 and clock extracting circuit 128.Digital carrier restoring circuit 124 is connected with receiving circuit 11, digital mixer 125 is connected with digital carrier restoring circuit 124 with receiving circuit 11, wave digital lowpass filter 126 is connected with digital mixer 125, clock extracting circuit 128 is connected with low-pass filter 126, and decision circuit 127 is connected with clock extracting circuit 128 with wave digital lowpass filter 126.
In receiving circuit 11, antenna 1101 receives analog AM RCC signal.Analog AM RCC signal is through the 3rd bandpass filter 1122 filtering out-of-band noises.External crystal oscillator 1120 produces local oscillated signal, and this local oscillated signal provides reference clock for frequency multiplier circuit 1121 simultaneously, and the signal of frequency multiplier circuit 1121 outputs sends to first Analogue mixer 1115.The signal that radiofrequency signal that first Analogue mixer 1115 receptions the 3rd bandpass filter 1122 sends and frequency multiplier circuit 1121 send also will obtain simulating signal after its mixing, this simulating signal is through first bandpass filter 207, obtain first analog if signal, first analog if signal is delivered to second Analogue mixer 1117 after through first variable gain amplifier 1123.Second Analogue mixer 1117 receives the local oscillated signal of first analog if signal and external crystal oscillator 1120 transmissions and will send to second bandpass filter 1118 after its mixing, obtain second analog if signal through second bandpass filter 1118, second analog if signal sends to the 3rd analog to digital converter 1119 after amplifying through second variable gain amplifier 1124, obtain a digital medium-frequency signal through the 3rd analog to digital converter, this digital medium-frequency signal sends to demodulator circuit 12 and carries out demodulation.
In demodulator circuit 12, behind this digital medium-frequency signal process digital carrier restoring circuit 124, obtain carrier signal, digital mixer 125 receives digital medium-frequency signal and carrier signal, wave digital lowpass filter 126 will be sent to after its mixing, obtain digital baseband signal through wave digital lowpass filter 126, this digital baseband signal sends to decision circuit 127 and clock extracting circuit 128, clock extracting circuit 128 extracts clock signal and this clock signal is sent to decision circuit 127 from digital baseband signal, decision circuit 127 adopts this clock signal that digital baseband signal is sampled, then sampled signals is adjudicated output RCC signal.Preferably, when sampled signals greater than 0 the time, decision circuit 128 output datas 1, when sampled signals is less than or equal to 0, decision circuit 128 output datas 0.Decision circuit 127 is given peripheral MCU with the RCC signal, and peripheral MCU decodes to this RCC signal according to the agreement of time encoding, can obtain temporal information.
Alternatively, receiving circuit 11 includes only the 3rd analog to digital converter 1119.
Alternatively, receiving circuit 11 includes only antenna 1101, first Analogue mixer 1115, first bandpass filter 1116, the 3rd analog to digital converter 1119 and external crystal oscillator 1120.
Alternatively, receiving circuit 11 comprises antenna, at least one local oscillation circuit, at least one mixting circuit that is connected in series, at least one bandpass filter and an analog to digital converter.At least one mixting circuit is connected with at least one local oscillation circuit with antenna; The output terminal of each mixting circuit is connected with a bandpass filter; The input end of arbitrary mixting circuit or output terminal are connected with an analog to digital converter.
In the present embodiment, the analog AM RCC signal of 11 pairs of receptions of receiving circuit is handled and is obtained digital am RCC signal, 12 couples of digital am RCC of demodulator circuit signal carries out demodulation process and obtains the RCC signal, thereby adopt digital processing method to obtain the RCC signal, because digital processing method is than the reliability height of simulation process method, so present embodiment has improved reception of RCC signal and demodulation reliability.
It should be noted that at last: above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (6)
1. a device that obtains the electric wave time signal is characterized in that, comprising:
Receiving circuit is used for the analog AM electric wave time signal that receives handled obtaining digital am electric wave time signal;
Demodulator circuit is connected with described receiving circuit, is used for that described digital am electric wave time signal is carried out demodulation process and obtains the electric wave time signal.
2. device according to claim 1 is characterized in that, described digital am electric wave time signal is a digital quadrature amplitude-modulated wave time signal, and described receiving circuit comprises:
Antenna;
At least one local oscillation circuit comprises at least one quadrature local oscillation circuit in described at least one local oscillation circuit;
At least one mixting circuit that is connected in series, be connected with described at least one local oscillation circuit with described antenna, comprise at least one quadrature mixting circuit in described at least one mixting circuit, described quadrature local oscillation circuit and described quadrature mixting circuit connect one to one;
At least two low-pass filters, each output branch road of the output terminal of described mixting circuit is connected with a low-pass filter;
At least one analog to digital converter, the input end of arbitrary mixting circuit or each of output terminal output branch road are connected with an analog to digital converter.
3. device according to claim 2 is characterized in that, described receiving circuit comprises:
Simulation quadrature mixting circuit is connected with described antenna, and the output terminal of described simulation quadrature mixting circuit comprises the first output branch road and the second output branch road;
The orthogonal simulation local oscillation circuit is connected with described simulation quadrature mixting circuit;
First simulation low-pass filter is connected with the described first output branch road;
Second simulation low-pass filter is connected with the described second output branch road;
First analog to digital converter is connected with described first simulation low-pass filter;
Second analog to digital converter is connected with described second simulation low-pass filter;
The digital quadrature mixing circuit is connected with described second analog to digital converter with described first analog to digital converter, and the output terminal of described digital quadrature mixing circuit comprises the 3rd output branch road and the 4th output branch road;
The orthogonal digital local oscillation circuit is connected with described digital quadrature mixing circuit;
First wave digital lowpass filter, an end is connected with described the 3rd output branch road, and the other end is connected with described demodulator circuit;
Second wave digital lowpass filter, an end is connected with described the 4th output branch road, and the other end is connected with described demodulator circuit.
4. according to claim 2 or 3 described devices, it is characterized in that described demodulator circuit comprises:
Circuit for calculating energy of orthogonal signal is connected with described receiving circuit, is used for obtaining according to following formula the energy signal of described digital am electric wave time signal:
I
2+Q
2
Wherein, I is the I road signal of each discrete signal in the described digital quadrature amplitude-modulated wave time signal, and Q is the Q road signal of each discrete signal in the described digital quadrature amplitude-modulated wave time signal;
The Threshold detection circuit is connected with described circuit for calculating energy of orthogonal signal, is used for obtaining the threshold value of each discrete signal of described energy signal;
Relatively decision device is connected with described circuit for calculating energy of orthogonal signal with described Threshold detection circuit, is used for according to described threshold value described energy signal being adjudicated, and obtains described electric wave time signal.
5. device according to claim 4 is characterized in that, described Threshold detection circuit comprises:
The time window counter is connected with described circuit for calculating energy of orthogonal signal, is used to set schedule time window;
Maximum value detecting circuit is connected with described time window counter, is used for each discrete signal for described energy signal, obtains the maximal value of described schedule time window self-energy signal;
The thresholding counting circuit, an end is connected with described maximum value detecting circuit, and the other end is connected with described relatively decision device, is used for obtaining the thresholding of described discrete signal according to described maximal value.
6. device according to claim 4 is characterized in that, described receiving circuit and described demodulator circuit are integrated on the chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020700582 CN202013492U (en) | 2010-12-31 | 2010-12-31 | Electric wave time signal acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020700582 CN202013492U (en) | 2010-12-31 | 2010-12-31 | Electric wave time signal acquisition device |
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| Publication Number | Publication Date |
|---|---|
| CN202013492U true CN202013492U (en) | 2011-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020700582 Expired - Lifetime CN202013492U (en) | 2010-12-31 | 2010-12-31 | Electric wave time signal acquisition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109814A (en) * | 2010-12-31 | 2011-06-29 | 北京昆腾微电子有限公司 | Device and method for acquiring electric wave time signals |
-
2010
- 2010-12-31 CN CN 201020700582 patent/CN202013492U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109814A (en) * | 2010-12-31 | 2011-06-29 | 北京昆腾微电子有限公司 | Device and method for acquiring electric wave time signals |
| CN102109814B (en) * | 2010-12-31 | 2013-03-06 | 北京昆腾微电子有限公司 | Device and method for acquiring electric wave time signals |
| US9008229B2 (en) | 2010-12-31 | 2015-04-14 | Beijing Kt Micro, Ltd. | Device and a method for obtaining a radio controlled clock signal |
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Granted publication date: 20111019 Effective date of abandoning: 20130306 |
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