CN102386913A - Oscillation frequency correction method and device - Google Patents

Abstract

An oscillation frequency correction method for correcting the oscillation frequency of electronic product includes receiving the time electric wave signal from radio emitting station, converting it to multiple pulse signals, calculating the pulse signals and the frequency signal corresponding to the oscillation frequency to generate corresponding control signal, and regulating the frequency signal of adjustable frequency generating unit in the electronic product by using the control signal to correct the oscillation frequency corresponding to the frequency signal. In addition, the invention also provides an oscillation frequency correction device for realizing the oscillation frequency correction method.

Description

Oscillation frequency correction method and device

technical field

The invention relates to a method and a device for correcting an oscillation frequency, in particular to a method and a device for easily achieving accurate frequency correction for the oscillation frequency of an electronic product.

Background technique

The frequency signal is very important in the operation of electronic products, because the frequency signal (also called oscillation frequency) is the most basic time reference basis for the operation of electronic products. In addition, the operation of the processing unit and other internal units in electronic products must rely on precise frequency signals for accurate communication and transmission. The synchronicity among these devices makes the data transmission between these devices can be performed correctly under the synchronous situation. When electronic products communicate or transmit data with external peripheral devices, the importance of the frequency signal is more obvious, so an accurate frequency signal is very important for electronic products

Generally speaking, frequency signals and their corresponding oscillation frequencies in electronic products are generated by oscillators in frequency signal generators (or called frequency generators). However, the oscillator will affect the stability of the output frequency signal of the frequency generator with factors such as temperature, use time, environment, noise, etc., that is, it may cause the frequency generator (or frequency generator) to generate time (or frequency) An inaccurate frequency signal (or oscillation frequency) that drifts or delays.

Therefore, traditionally, in order to solve the above-mentioned problems, the above-mentioned oscillator is replaced by a precision oscillator to generate an accurate signal of the frequency. However, using the precision oscillator will relatively increase the cost of using the frequency signal generator.

On the other hand, in order to achieve continuous and accurate output of this frequency signal, in addition to using a precision oscillator, it is also necessary to use time signals such as time standards such as NTP, IEEE 1588, GPS or TV on the network to provide dynamic frequency correction. For example, you can refer to the "AGPS SYSTEM USING NTP SERVER AND METHOD FORDETERMINING THE LOCATION OF A TERMINAL USING A NTPSERVER" proposed by US Patent No. 7236126 B2, which utilizes the time information provided by the Network Time Protocol (Network Time Protocol) to determine the time Correction, and through to achieve the purpose of time synchronization. However, to use the network time standard, the network time standard must first be connected to the Internet to obtain the network time standard, which is obviously inconvenient for electronic products that do not have the function of connecting to the Internet, so there are many restrictions on use.

Therefore, the present invention provides a method and a device that can be used to achieve the purpose of low-cost, fast and accurate calibration of the oscillation frequency corresponding to the frequency signal.

Contents of the invention

The purpose of the present invention is to propose a method for calibrating the oscillation frequency to achieve the purpose of calibrating the oscillation frequency of electronic products.

Another object of the present invention is to provide an oscillation frequency calibration device for providing accurate oscillation frequency calibration in electronic products.

In order to achieve the above and other purposes, the present invention proposes a method for correcting the oscillation frequency, which is used to correct the oscillation frequency of an electronic product, and the electronic product has an adjustable frequency generating unit to generate a frequency signal corresponding to the oscillation frequency. The correction method includes receiving a time wave signal transmitted by a radio transmitting station, and converting it into a corresponding complex pulse signal; calculating the pulse signal and the frequency signal, and generating a corresponding control signal; and using the control signal to adjust the adjustable The frequency signal generated by the modulating frequency generating unit is used to correct the corresponding oscillation frequency.

In order to achieve the above purpose and other purposes, the present invention proposes an oscillation frequency correction device, which is used in an environment where the time radio signal transmitted by a radio transmitting station can be received to correct the oscillation frequency of an electronic product. The oscillation frequency correction device includes radio wave A receiving unit, an adjustable frequency generating unit and a processing unit. The electric wave receiving unit has an antenna for receiving the time electric wave signal, and a receiving circuit for converting the electric wave signal into a complex pulse signal; the adjustable frequency generating unit is used for generating a frequency signal corresponding to the oscillation frequency; and the The processing unit is coupled to the radio wave receiving unit and the adjustable frequency generating unit, and is used for receiving and calculating the number of frequency signals generated within the time length of the pulse signals and generating corresponding control signals, and using the control signal feedback to adjust the The frequency signal generated by the adjustable frequency generating unit is used to correct the corresponding oscillation frequency.

Compared with the known technology, the oscillation frequency correction method and device provided by the present invention can accurately correct the adjustable frequency generation in electronic products without using a precise oscillator or using any standard time in the Internet. The frequency signal corresponding to the oscillation frequency generated by the unit.

Description of drawings

Fig. 1 is the flowchart of oscillation frequency correction method;

Fig. 2 is a schematic diagram of a pulse signal and a frequency signal; and

FIG. 3 is a schematic block diagram of an oscillation frequency correction device.

[Description of main component symbols]

1 Oscillation frequency correction device

2 radio transmitters

3 radio wave receiving unit

32 antennas

34 signal processing circuit

4 adjustable frequency generating units

5 processing units

BS radio signal

PS pulse signal

TS frequency signal

CS control signal

Detailed ways

In order to fully understand the purpose, features and effects of the present invention, the present invention will be described in detail by means of the following specific embodiments and accompanying drawings, as follows:

Referring to FIG. 1 , it is a flowchart of an oscillation frequency correction method according to an embodiment of the present invention. In FIG. 1, the oscillation frequency correction method is used to correct the oscillation frequency of an electronic product, and the electronic product has an adjustable frequency generating unit to generate a frequency signal corresponding to the oscillation frequency. The correction method starts at step S1, And the step S1 is to receive the time wave signal transmitted by a radio transmitting station and convert it into a corresponding complex pulse signal. For example, the time wave signal contains time information such as minutes, hours, years, and weeks, and the pulse signals The time information mentioned above is also included, and a start bit is provided to identify the time signal, as described in FIG. 2 .

In addition, the radio transmitter is based on the Japanese calibration signal system (JJY), the Chinese standard radio signal (BPC), the Chinese long-wave timing signal (BPL), the German long-wave time signal and standard frequency radio system (DCFF77), and the British time radio signal ( GBZ), Swiss Low Frequency Time Signal Transmission System (HBG), British Folk Time Radio System (MSF), Russian Time Signal Radio System (RBU), Russian Khabarovsk Time Signal Transmission System (RAB99), Russian Time Signal Radio System (RJH -63), Belarusian Time Signal Radio System (RJH-69), Belarusian Time Signal Radio System (RJH-77), Russian Time Signal Radio System (RJH-86), Russian Time Signal Radio System (RJH-90), Siberia Time Signal (RTZ), French Time Signal Service (TDF), American Time Signal Radio System (WWVB), Japanese Standard Long Wave Time Scale System (JG2AS), or Czech Time Signal System (OMA).

Then step S2 is to calculate the pulse signal and the frequency signal, and generate a corresponding control signal, and the control signal is a voltage level, which can be adjusted by using the change of the voltage level to adjust the frequency generated by the adjustable frequency generating unit. the frequency signal. It should be noted that the change of the voltage level is used to adjust the capacitance of the variable capacitor in the adjustable frequency generating unit, and changing the capacitance can be used to adjust the frequency signal corresponding to the oscillation frequency.

Furthermore, in one embodiment, calculating the pulse signals and the frequency signal can be used to calculate the number of frequency signals generated within the time length of the pulse signals to obtain the corresponding control signal. For example, referring to FIG. 2, The time frame of the time radio signal is 1 minute as the time length, and is further divided into 0-59 seconds, and the pulse signal corresponds to 0-59 pulse signals to represent the time length of the time radio signal , that is, each pulse signal represents 1 second. Here, taking "minute" as an example, the "minute" is composed of 7 pulse signals, then the calculation is based on 7 pulse signals as the time length, and by calculating this The number of frequency signals corresponding to the time length is used to further judge whether the frequency signal is accurate. For example, if the number of frequency signals generated is also 7, it means that the frequency signal is also 7 seconds. On the contrary, if the number exceeds or is less than, then It represents that the frequency signal is advanced or delayed, and a corresponding control signal output is generated according to the result of the advance or delay.

Next step S3 is to use the control signal to adjust the frequency signal generated by the adjustable frequency generating unit to correct the corresponding oscillation frequency. For example, the change of the voltage level of the control signal is used to adjust the capacitance value of the variable capacitor in the adjustable frequency generating unit, so that the change of the capacitance value is used to adjust the frequency signal corresponding to the oscillation frequency, thereby correcting the The frequency should be oscillating.

Referring to FIG. 3 , it is a schematic block diagram of an oscillation frequency correction device according to an embodiment of the present invention. The oscillation frequency correction device 1 is used in an environment where the time radio signal BS transmitted by a radio transmitting station 2 can be received, and is used to correct the oscillation frequency of an electronic product. , the oscillation frequency calibration device 1 includes a radio wave receiving unit 3 , an adjustable frequency generating unit 4 and a processing unit 5 . The radio transmitting station 2 is based on JJY, BPC, BPL, DCFF77, GBZ, HBG, MSF, RBU, RAB99, RJH-63, RJH-69, RJH-77, RJH-86, RJH-90, RTZ, TDF, WWVB , JG2AS, or the time radio signal BS transmitted by OMA. Generally speaking, the radio transmitting station 2 transmits the radio wave signal BS with a standard time signal according to a cesium atomic clock.

The radio wave receiving unit 3 has an antenna 32 for receiving the time radio signal BS, and a signal processing circuit 34 for converting the time radio signal BS into a complex pulse signal PS. Wherein, the time radio signal BS and the pulse signals PS can be illustrated in FIG. 2 .

The adjustable frequency generating unit 4 is used for generating a frequency signal TS corresponding to the oscillation frequency. Wherein, the adjustable frequency generating unit 4 includes a variable capacitor VC with voltage level control capacitance, which can provide a reverse bias voltage of the variable capacitor VC through the voltage level, when the reverse bias applied to the variable capacitor VC When the voltage increases, the distance between the conductor surfaces in the variable capacitor VC will become longer, that is, the capacitance will be reduced, and the frequency signal generation speed will be reduced at the same time; on the contrary, when the reverse direction applied to the variable capacitor VC When the bias voltage is reduced, the distance between the conductor surfaces in the variable capacitor VC will be shortened, that is, the capacitance will be increased, and the frequency signal generation speed will be increased at the same time. Therefore, the frequency signal TS output by the adjustable frequency generating unit 4 can be adjusted by changing the voltage level. For example, the variable capacitor VC is a diode capacitor (Junction Capacitance), a standard metal oxide semiconductor variable capacitor (Standard-mode MOS Varactor), an inversion type metal oxide semiconductor variable capacitor (Inversion-mode MOS Varactor) or an accumulation type Metal oxide semiconductor variable capacitor (Accumulation-mode MOS Varactor).

The processing unit 5 is coupled to the radio wave receiving unit 3 and the adjustable frequency generating unit 4 for receiving and calculating the number of the frequency signal TS generated within the time length of the pulse signal PS and generating a corresponding control signal CS, and utilizing The control signal CS feeds back and adjusts the frequency signal TS generated by the adjustable frequency generating unit 4 to correct the oscillation frequency corresponding to the electronic product. For example, the control signal CS is a voltage level, and is used to change the voltage level corresponding to the number of times the frequency signal TS is generated within the time length of the pulse signal PS according to the calculation, so as to provide the voltage level feedback to adjust the adjustable voltage level. Modulating the frequency signal TS generated by the frequency generating unit 4, and correcting the corresponding oscillation frequency.

Compared with the known technology, the oscillation frequency correction method and device provided by the present invention can accurately correct the adjustable frequency generation in electronic products without using a precise oscillator or using any standard time in the Internet. The frequency signal corresponding to the oscillation frequency generated by the unit.

The present invention has been disclosed above with preferred embodiments, but those skilled in the art should understand that the embodiments are only used to describe the present invention, and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to this embodiment should be included within the scope of the present invention. Therefore, the protection scope of the present invention should be defined by the following claims.

Claims (10)

1. frequency of oscillation bearing calibration is used for the frequency of oscillation of correcting electronic product, and this electronic product has adjustable frequency generation unit to produce frequency signal that should frequency of oscillation, it is characterized in that this bearing calibration comprises:

The time radio wave signal that reception is launched from the radio-transmitting station, and convert corresponding plural pulse signal to;

Calculate these pulse signals and this frequency signal and the corresponding control signal of generation; And

This frequency signal that utilizes this this adjustable frequency generation unit of control signal adjustment to be produced is to proofread and correct this corresponding frequency of oscillation.

2. frequency of oscillation bearing calibration as claimed in claim 1 is characterized in that, calculates the step of these pulse signals and this frequency signal, is used to calculate this frequency signal generation number in the time span of these pulse signals.

3. frequency of oscillation bearing calibration as claimed in claim 1 is characterized in that this control signal is a voltage level, and utilizes the variation of this voltage level to adjust this frequency signal that this adjustable frequency generation unit is produced.

4. frequency of oscillation bearing calibration as claimed in claim 3; It is characterized in that; The variation of this voltage level is used for adjusting the capacitance of this adjustable frequency generation unit variable capacitance, and the variation of this capacitance is used to adjust to this frequency signal that should frequency of oscillation.

5. frequency of oscillation bearing calibration as claimed in claim 1; It is characterized in that this radio-transmitting station is this time radio wave signal of being launched with Japanese calibrating signal system (JJY), Chinese Industrial Standards (CIS) electric wave signal (BPC), Chinese long wave time signal (BPL), German long wave time signal and standard frequency electric wave system (DCFF77), British Time electric wave signal (GBZ), Switzerland's low frequency time signal transmission system (HBG), Britain's time among the people wide wave system system (MSF), Russian time signal electric wave system (RBU), Russian Bai Li city time signal transmission system (RAB99), Russian time signal electric wave system (RJH-63), Byelorussia time signal electric wave system (RJH-69), Byelorussia time signal electric wave system (RJH-77), Russian time signal electric wave system (RJH-86), Russian time signal electric wave system (RJH-90), Siberia time signal (RTZ), French time signal service system (TDF), U.S. time signal electric wave system (WWVB), Nippon Standard long wave timestamp system (JG2AS) or Czech's system time signal (OMA).

6. a frequency of oscillation means for correcting is applied to receive in the environment of radio-transmitting station institute electric wave signal launch time, supplies the frequency of oscillation of correcting electronic product, it is characterized in that this frequency of oscillation means for correcting comprises:

The electric wave receiving element has and is used to receive the antenna of this time radio wave signal and is used for the pluralize signal processing circuit of pulse signal of this time radio wave conversion of signals;

Adjustable frequency generation unit is used to produce to frequency signal that should frequency of oscillation; And

Processing unit; Be this electric wave receiving element of coupling and this adjustable frequency generation unit; Be used to receive and calculate that this frequency signal produces number and produces corresponding control signal in the time span of these pulse signals; And utilize this control signal to feedback and adjust this frequency signal that this adjustable frequency generation unit is produced, to proofread and correct this corresponding frequency of oscillation.

7. frequency of oscillation means for correcting as claimed in claim 6 is characterized in that this control signal is a voltage level, and is used in according to calculation this voltage level of the corresponding change of this frequency signal generation number in the time span of these pulse signals.

8. frequency of oscillation means for correcting as claimed in claim 6 is characterized in that, this adjustable frequency generation unit comprises the variable capacitance of tool voltage level control capacitance amount.

9. frequency of oscillation means for correcting as claimed in claim 8; It is characterized in that this variable capacitance is diode capacitance (Junction Capacitance), standard metal oxide semiconductor variable capacitance (Standard-mode MOS Varactor), counter-rotative type metal-oxide semiconductor (MOS) variable capacitance (Inversion-mode MOS Varactor) or accumulation type metal oxide semiconductor variable capacitance (Accumulation-mode MOS Varactor).

10. frequency of oscillation means for correcting as claimed in claim 6; It is characterized in that this radio-transmitting station is with JJY, BPC, BPL, DCFF77, GBZ, HBG, MSF, RBU, RAB99, RJH-63, RJH-69, RJH-77, RJH-86, RJH-90, RTZ, TDF, WWVB, JG2AS or this time radio wave signal of OMA emission.

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