CN1455518A - Frequency setting method and its apparatus - Google Patents
Frequency setting method and its apparatus Download PDFInfo
- Publication number
- CN1455518A CN1455518A CN 03108078 CN03108078A CN1455518A CN 1455518 A CN1455518 A CN 1455518A CN 03108078 CN03108078 CN 03108078 CN 03108078 A CN03108078 A CN 03108078A CN 1455518 A CN1455518 A CN 1455518A
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- frequency
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- frequency value
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Abstract
In the method, the setting frequency value and the receiving frequency are read in first and then a compared frequency value is outputted after above said two values having been compared, finally the receiving frequency of tuned circuit is adjusted according to the compared frequency value. The device for realizing the method comprises a tunning circuit a variode, an analog-digital convertor, a digital processing unit and a control circuit, of which the variode and the tuning circuit are in parallel connection.
Description
Technical field
The present invention relates to a kind of frequency setting method and device thereof of radio receiving equipment, be specifically related to a kind of frequency setting method and the device thereof of portable digital product.
Technical background
Existing radio receiver all is to utilize the relevant control circuit of hardware divider counter collocation to show and setting with the realization frequency basically, and frequency shows that also mostly being the circuit that utilizes special use realizes.It is big that these circuit exist volume mostly, problems such as power consumption is big, cost height.For day by day becoming popular carry-on digital product or the portable digital product that generally adopts, characteristic compact, easy to carry has determined volume, power consumption and the cost of spare part to become the most important Consideration of product design.
Thereby foregoing circuit is difficult to satisfy the design needs of portable digital product.And it is most devices, because very strict to the requirement of space, power consumption and hardware cost, therefore,, also undesirable if accepting circuit with this dedicated radio frequencies directly applies in the carry-on digital product with digital processing system and D/A conversion circuit.
Summary of the invention
Based on above-mentioned situation, the object of the present invention is to provide a kind of volume little, power consumption is little, cost is low, is applicable to the frequency setting method and the device thereof of carry-on digital product.
The invention provides a kind of frequency setting method, its special character is: at first read into setpoint frequency value and receive frequency value; Then relatively export a comparison frequency value after this setpoint frequency value and this receive frequency value; Adjust the receive frequency of tuning circuit at last according to the comparison frequency value.
In such scheme:
Reading into, the setpoint frequency value also comprises the following step: the magnitude of voltage that reads variable capacitance diode; According to the electric voltage frequency table, this magnitude of voltage is converted into the receive frequency value.
The receive frequency value is between searching the frequency initial value and searching between the ending frequency point value.
Adjust according to the comparison frequency value in the step of receive frequency of tuning circuit and also comprise: if the setpoint frequency value greater than the receive frequency value, is then searched radio signals to searching ending frequency point; Ruo Let decides ， You Tone Harmonic Electricity road, the little what receive frequency of frequency values Zhi ， The replacement The Tone Harmonic Electricity road and searches Look again from searching the frequency initial value; Ruo Let decides what receive frequency Zhi ， The such as frequency values and begins to listen to.
Realize the device of said method, its composition of its special character comprises: a tuning circuit, and a variable capacitance diode, an analog-digital converter, a data processing unit and a control circuit, wherein variable capacitance diode is in parallel with tuning circuit.
In such scheme:
Tuning circuit comprises the antenna received audio signal circuit that is made of common circuit, also has the frequency lock loop circuit (Frequency-Locked-Loop of frequency deviation in search tuning circuit, signal deteching circuit, squelch circuit and the compression; FLL) tuning chip of Zu Chenging.
Description of drawings
The circuit block diagram that Fig. 1 sets for receive frequency of the present invention;
The method flow diagram that Fig. 2 sets for receive frequency of the present invention;
Fig. 3 is for reading the flow chart of receive frequency in the receive frequency establishing method of the present invention.
Embodiment
With reference to Fig. 1, tuning circuit is in order to receive a wireless frequency, variable capacitance diode is then in order to export a tuning voltage according to this wireless frequency, analog-digital converter is then exported a digital tuning voltage according to this tuning voltage, again by data processing unit according to this digital tuning voltage, converse the receive frequency value, more relatively with receive frequency value and a preset frequency value, and export a comparison frequency value, to adjust tuning circuit.The setpoint frequency value is imported by the user, the frequency of radio station signal of desiring to listen to for the user.
Tuning circuit adopts and comprises the antenna received audio signal circuit that is made of common circuit, also has the frequency lock loop circuit (Frequency-Locked-Loop of frequency deviation in search tuning circuit, signal deteching circuit, squelch circuit and the compression; FLL) tuning chip of Zu Chenging.Can not only realize above-mentioned purpose, and can reach and make carry-on digital product reduce volume, power consumption, the effect that reduces cost.
The method that the disclosed wireless frequency of the present invention is set is to realize adjusting automatically the receive frequency purpose by the output voltage of the tuning pin in the tuning chip.When tuning circuit receives the signal of certain intensity, promptly stop the variation of voltage.
The output voltage of tuning pin is in order to judge the frequency values that is received at present, and the output voltage of tuning pin changes between initial voltage and end voltage, the voltage range of general change about O volt (initial voltage) within 3 volts (end voltage).Initial voltage corresponds to a search frequency and opens initial value, and end voltage corresponds to one and searches the ending frequency point value.Divide between initial voltage and end voltage a plurality of magnitudes of voltage are arranged, each magnitude of voltage is to there being a frequency values, FM wave band 87.5MHz to 108MHz for example, with 50kHz is at interval, can distinguish 410 points altogether, so, can find out present frequency values by detecting the output voltage values of tuning pin.
With reference to Fig. 2,3, this frequency setting device is searched the workflow of radio station method:
Before carrying out the radio station search, at first search (search ending frequency point) or (search beginning frequency point) to determine to make progress and search the radio station signal according to present receive frequency value.At first read into setpoint frequency value, then read into receive frequency value, and relatively a comparison frequency value is exported in the back, in order to judge that whether the setpoint frequency value is greater than the receive frequency value.Wherein the setpoint frequency value is to set the frequency of desiring to listen to the radio station by the user, and the receive frequency value is the frequency that present tuning circuit received, and is converted via the microprocessor in the digital product by the voltage of tuning chip pin and gets.
Above-mentioned reading frequency reception value includes two steps, is at first read the magnitude of voltage of variable capacitance diode by the emulation passage in the digital product, and again according to an electric voltage frequency table, converting obtains the receive frequency value.The electric voltage frequency table is stored in the holder of digital product.After obtaining the receive frequency value, more can on the display unit of digital product, show the receive frequency value.
Follow according to the comparison frequency value to search the radio station signal.If the setpoint frequency value is greater than the receive frequency value, then search the radio station signal to searching ending frequency point, that is the output voltage of the variable capacitance diode of tuning circuit with a constant spacing to the end voltage adjustment.If less than the receive frequency value, behind the tuning circuit of then resetting, begin to search from searching beginning frequency point by tuning circuit.Wherein, the given pulse voltage of replacement tuning circuit makes the frequency of oscillation of tuning circuit be returned to the search beginning frequency point to the pin of resetting.Then trigger again and search pin (voltage that will search pin is drawn high), make that tuning circuit begins to begin to search the radio station by searching the frequency initial value.If the setpoint frequency value equals the receive frequency value, then begin to listen to.
Claims (6)
1. the frequency setting method of a radio receiving equipment is characterized in that: at first read into setpoint frequency value and receive frequency value; Then relatively export a comparison frequency value after this setpoint frequency value and this receive frequency value; Adjust the receive frequency of tuning circuit at last according to the comparison frequency value.
2. the frequency setting method of radio receiving equipment as claimed in claim 1 is characterized in that, reading into, the setpoint frequency value also comprises the following step: the magnitude of voltage that reads variable capacitance diode; According to the electric voltage frequency table, this magnitude of voltage is converted into the receive frequency value.
3. the frequency setting method of radio receiving equipment as claimed in claim 1 is characterized in that, the receive frequency value is between searching the frequency initial value and searching between the ending frequency point value.
4. the frequency setting method of radio receiving equipment as claimed in claim 1, it is characterized in that, adjust according to the comparison frequency value in the step of receive frequency of tuning circuit and also comprise: if the setpoint frequency value greater than the receive frequency value, is then searched radio signals to searching ending frequency point; Ruo Let decides ， You Tone Harmonic Electricity road, the little what receive frequency of frequency values Zhi ， The replacement The Tone Harmonic Electricity road and searches Look again from searching the frequency initial value; Ruo Let decides what receive frequency Zhi ， The such as frequency values and begins to listen to.
5. realize the frequency setting device of the described method of claim 1, it is characterized in that its composition comprises: a tuning circuit, one variable capacitance diode, one analog-digital converter, a data processing unit and a control circuit, wherein variable capacitance diode is in parallel with tuning circuit.
6. frequency setting device as claimed in claim 5, it is characterized in that, tuning circuit comprises the antenna received audio signal circuit that is made of common circuit, also has the tuning chip of the frequency-locked loop circuit composition of frequency deviation in search tuning circuit, signal deteching circuit, squelch circuit and the compression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108078 CN1455518A (en) | 2003-05-26 | 2003-05-26 | Frequency setting method and its apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108078 CN1455518A (en) | 2003-05-26 | 2003-05-26 | Frequency setting method and its apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1455518A true CN1455518A (en) | 2003-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03108078 Pending CN1455518A (en) | 2003-05-26 | 2003-05-26 | Frequency setting method and its apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1455518A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457575A (en) * | 2012-06-04 | 2013-12-18 | 半导体元件工业有限责任公司 | Tuning circuit |
-
2003
- 2003-05-26 CN CN 03108078 patent/CN1455518A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457575A (en) * | 2012-06-04 | 2013-12-18 | 半导体元件工业有限责任公司 | Tuning circuit |
| CN103457575B (en) * | 2012-06-04 | 2016-08-10 | 半导体元件工业有限责任公司 | Tuning circuit |
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| WD01 | Invention patent application deemed withdrawn after publication |