CN101453223B - Signal receiving method and related receiving apparatus - Google Patents
Signal receiving method and related receiving apparatus Download PDFInfo
- Publication number
- CN101453223B CN101453223B CN 200710196132 CN200710196132A CN101453223B CN 101453223 B CN101453223 B CN 101453223B CN 200710196132 CN200710196132 CN 200710196132 CN 200710196132 A CN200710196132 A CN 200710196132A CN 101453223 B CN101453223 B CN 101453223B
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- switching signal
- channel
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
A signal receiving device comprises a frequency conversion circuit, a calculation device and a control circuit. The frequency conversion circuit is used for receiving a radio-frequency signal, and converting the radio-frequency signal according to a first conversion frequency and a second conversion frequency so as to respectively generate a first conversion signal and a second conversion signal;the calculation device is used for calculating signal quality parameters of the first conversion signal and the second conversion signal; and the control circuit is used for outputting a control signal according to the signal quality parameters, and the control signal is corresponding to the conversion frequency of the frequency conversion circuit.
Description
Technical field
The present invention is particularly to the receiving system of broadcast system relevant for broadcast system.
Background technology
Digital broadcast signal can be divided into digital audio broadcasting (Digital Audio Broadcasting, DAB) and digital video broadcasting (Digital Video Broadcasting, and DAB has all size if any European specification Eureka-147 (this specification is followed in Taiwan), American I BOC and French DRM DVB); DVB has DVB-T and DVB-H etc. again, and the different bandwidth of signal tool of every kind of specification, have 6,7 or 8MHz as DVB-T, and DAB is 1.536MHz.In addition, also there are other specifications various countries, as T-DMB (Korea S's mobile TV exploitation standard).So if will receive the signal of these different sizes, receiving system also need have special design.
For comprehensively plurality of specifications is in single receiver, a method so so can increase cost for using the SAW filter of a plurality of different bandwidths.Another feasible way is for sharing a tuner (Tuner) and since in the tuner with the SAW filter as channel select filter, can use digital filter to select channel for the narrower specification of signal bandwidth (for example being DAB).Fig. 1 is known receiving system 100 structure charts of comprehensive DVB-T and DAB specification.This receiving system 100 comprises a tuner 101, an analog to digital converter 103, a frequency demultiplier (down-converter) 105, a low pass filter 107, fast fourier conversion (FFT) circuit 109, a post processing circuitry 111 and a synchronous circuit 113.Wherein, 113 of synchronous circuits are in order to provide a synchronous information to fast fourier change-over circuit 109.Because the detailed construction of known receiving system 100 and running are understood by those skilled in the art, so do not repeat them here.What deserves to be mentioned is: when receiving the DAB specification signal, because the output signal SIF of tuner 101 includes adjacent channel signal (adjacent channel signal, ACS), owing to be subjected to the influence of adjacent channel signal, can cause ADC and digital circuit to need more figure place (resolution), the output signal of tuner 101 contains the composition of adjacent channel signal simultaneously, and the intensity of adjacent channel signal can be greater than the channel signal of desire reception, so can reduce usefulness and the sensitivity (sensitivity) of whole system usually.For this reason, need the invention of a novelty badly to address the above problem.
Summary of the invention
One of purpose of the present invention provides a kind of signal acceptance method and relevant apparatus, can make the radiofrequency signal receiving system can be same surface acoustic wave filter handle the signal of different size.
One of purpose of the present invention provides a kind of signal acceptance method and relevant apparatus, can make the radiofrequency signal receiving system operate in preferable frequency and disturb to exempt adjacent signal (ACS).
One of purpose of the present invention provides a kind of signal acceptance method and relevant apparatus, utilizes the inversion frequency of control frequency change-over circuit, to reduce the influence of ACS.
The invention provides a kind of signal receiving device, comprise: a freq converting circuit, in order to receiving a radiofrequency signal, and come this radiofrequency signal is changed and one first switching signal and one second switching signal of generation respectively according to one first inversion frequency and one second inversion frequency; One calculation element is coupled to this freq converting circuit, in order to calculate the signal quality parameter of this first switching signal and this second switching signal; An and control circuit, be coupled to this freq converting circuit and this calculation element, this control circuit according to the signal quality parameter of this first switching signal and this second switching signal to export a control signal, wherein, this control signal is corresponding with the inversion frequency of this freq converting circuit, wherein this first inversion frequency is that benchmark is added and subtracted a predetermined value with a centre frequency of a required channel signal, wherein this freq converting circuit also comprises: a surface acoustic wave filter, be coupled to this control circuit, in order to adjust the frequency band position of this surface acoustic wave filter according to this control signal, this surface acoustic wave filter is changed an intermediate-freuqncy signal with this radiofrequency signal; An and frequency demultiplier, in order to convert this intermediate-freuqncy signal to a fundamental frequency signal, wherein this control circuit comes the inversion frequency of this freq converting circuit is adjusted according to centre frequency and this predetermined value of this required channel signal, and wherein the scope of the bandwidth of this this required channel signal of predetermined value foundation, this surface acoustic wave filter and the channel distance that transmits this required channel signal are set.
The present invention also provides a kind of signal acceptance method that is applied on the receiving system, and this receiving system comprises a radio frequency change-over circuit, and this method comprises: receive a radiofrequency signal; According to a selected channel, be one first frequency band with a band setting of this radio frequency change-over circuit, wherein this first frequency band is that benchmark is added and subtracted a predetermined value with a centre frequency of a required channel signal, comes the inversion frequency of this radio frequency change-over circuit is adjusted according to centre frequency and this predetermined value of this required channel signal; This first frequency band according to this radio frequency change-over circuit converts this radiofrequency signal to one first switching signal; According to this first switching signal to calculate one first mass parameter; According to should selected channel, be one second frequency band with this band setting of this radio frequency change-over circuit, wherein the position of this first frequency band and this second frequency band is inequality; This second frequency band according to this radio frequency change-over circuit converts this radiofrequency signal to one second switching signal; According to this second switching signal to calculate one second mass parameter; An and target band that determines this radio frequency change-over circuit according to this first, second mass parameter, wherein this radio frequency change-over circuit comprises a surface acoustic wave filter, the filter range of this predetermined value and this surface acoustic wave filter, the bandwidth of this radiofrequency signal, relevant with the channel distance of this radiofrequency signal.
Description of drawings
Fig. 1 represents the receiving system of known DVB-T specification.
Fig. 2 represents the signal acceptance method of one embodiment of the invention.
Fig. 3 represents the signal acceptance method of one embodiment of the invention.
Fig. 4 represents the signal acceptance method of one embodiment of the invention.
Fig. 5 represents the calcspar of the signal receiving device of one embodiment of the invention.
The main element symbol description
101 tuners, 103 analog to digital converters
105 frequency eliminators, 107 low pass filters
109 fast fourier change-over circuits, 111 post processing circuitries
113 synchronous circuits
600 signal receiving devices, 601 tuners
603 digital to analog converters, 605 frequency demultipliers
607 control units, 609 calculation elements
611 freq converting circuits
Embodiment
Generally speaking, for for a plurality of channel signals in the radiofrequency signal, its signal strength signal intensity is cumulative or decrescence.For example be the signal strength signal intensity of left side ACS greater than the signal strength signal intensity of required channel signal, and the signal strength signal intensity of required channel signal is greater than the signal strength signal intensity of the right ACS; Or the signal strength signal intensity of left side ACS is less than the signal strength signal intensity of required channel signal, and the signal strength signal intensity of required channel signal is less than the signal strength signal intensity of the right ACS.This characteristics of signals can be understood for those skilled in the art.
The signal acceptance method of Fig. 2 to 4 expression one embodiment of the invention.Show as Fig. 2, earlier the tuner centre frequency is set to first frequency f1, this moment signal the center can be corresponding transferred to second frequency f2 (being generally intermediate frequency) by tuner, and with the frequency setting of frequency demultiplier to second frequency f2, after signal then converts fundamental frequency signal to, measure and note down the signal quality parameter of fundamental frequency signal again.Then, the tuner centre frequency is set to the 3rd frequency f 3, if the 3rd frequency f 3 adds a predetermined value for first frequency f1, then the relation of signal and surface acoustic wave filter just as shown in Figure 3, if the 3rd frequency f 3 deducts a predetermined value for first frequency f1, then the relation of signal and surface acoustic wave filter just as shown in Figure 4.The center of signal can be corresponding then is transferred to the 4th frequency f 4 (being generally intermediate frequency) by tuner, if with frequency setting to the four frequency f 4 of frequency demultiplier, signal just is convertible into fundamental frequency signal.Then, measure and note down the signal quality parameter of fundamental frequency signal and select preferable tuner frequencies and frequency demultiplier frequency according to signal quality parameter, so, can exempt the adjacent signal interference phenomenon when receiving signal.The 2nd to embodiment shown in Figure 4, the scope of surface acoustic wave filter is that the distance between 6MHZ, channel is 1.712MHZ, and the bandwidth of desired signal is 1.536MHZ.In Fig. 2, can be considered have the center frequently the fundamental frequency signal of f3 comprise the required passage that transmit desired signal and the adjacent channel that transmits adjacent signal, and the frequency of adjacent channel signal is all in fact greater than the frequency of required channel signal.Same, in Fig. 4, can be considered have the center frequently the fundamental frequency signal of f3 comprise the required passage that transmit desired signal and the adjacent channel that transmits adjacent signal, and the frequency of adjacent channel signal is all in fact less than the frequency of required channel signal.
Be noted that, above-mentioned though (first frequency f1 and the 3rd frequency f 3) more as an illustration with two frequencies, after also available a plurality of frequency is obtained its signal quality parameter respectively, obtain the optimum frequency that the release adjacent signal when receiving signal is disturbed according to signal quality again.For instance, elder generation deducts a predetermined value and notes down signal quality parameter after using first frequency f1 and noting down signal quality parameter; Then, again first frequency f1 is added a predetermined value and note down signal quality parameter; Can exempt the preferable frequency that adjacent signal is disturbed when being chosen in the reception signal according to signal quality parameter more at last.
And, the 3rd and Fig. 4 in, though the 3rd frequency f 3 all drops in the adjacent signal, be not in order to limit the present invention.First frequency f1 can fall within Anywhere (fx as shown in Figure 3 or fy) after deducting or add a predetermined value.In an embodiment, predetermined value is according to the bandwidth (being 1.536MHZ in this example) of desired signal, the scope of surface acoustic wave filter (being 6MHZ in this example), and the channel distance of the channel of transmission signal is set (being 1.712MHZ in this example).Among this embodiment, predetermined value can be tried to achieve by following formula:
The usefulness of this practice is intended to desire to be allowed surface acoustic wave filter can contain desired signal itself but not to contain the edge part of desired signal, that is can cause the adjacent signal of interference, but this is not in order to limit the present invention.
One embodiment, use the radiofrequency signal receiving system of the method shown in the 2-4 figure, set and receive a target radio frequency signal that meets the DAB specification, the 3rd frequency is that first frequency is added and subtracted a predetermined value, the bandwidth of the corresponding target radio frequency signal of this predetermined value, scope and the channel distance of surface acoustic wave filter.So the radiofrequency signal receiving system can be utilized identical surface acoustic wave filter and receive the signal that meets the DAB specification.In addition, aforesaid signal quality parameter can be a signal to noise ratio (snr) or a bit error rate (BER).So, these narrations are not in order to limit the present invention only in order to for example.For example, the radiofrequency signal receiving system can receive the out-of-spec signal of DAB, predetermined value also can not corresponding target radio frequency signal bandwidth and is certain value or a random value, but the also running situation of dynamic detection system and change predetermined value immediately, and this a bit all should be within the scope of the present invention.
Fig. 5 represents the calcspar of the signal receiving device 600 of one embodiment of the invention, and in order to implement above-mentioned method.Signal receiving device 600 comprises a tuner 601, an analog to digital converter 603, a frequency demultiplier 605, a control unit 607 and a calculation element 609.Tuner 601 converts a radiofrequency signal RF to an intermediate-freuqncy signal IF.Analog to digital converter 603 converts intermediate-freuqncy signal IF to digital signal DS.Frequency demultiplier 605 according to digital signal DS to produce a fundamental frequency signal BS.The frequency of control unit 607 control tuners 601 and frequency demultiplier 605, wherein control unit 607 makes tuner 601 produce a plurality of different IF signals with different frequency, and makes frequency demultiplier 605 produce a plurality of fundamental frequency signals that correspond to intermediate-freuqncy signal with different frequencies; Wherein the frequency of frequency demultiplier 605 corresponds to the frequency of tuner 601.Calculation element 609 is coupled to control unit 607, and in order to calculate and to store the signal quality parameter of those fundamental frequency signals, wherein control unit 607 determines tuner 601 and frequency demultiplier 605 required frequencies according to signal quality parameter.In this, calculation element 609 can calculate signal to noise ratio (snr) or the bit error rate (BER) of received signal or both are to export corresponding signal quality parameter.The field is known for this reason for the technology of calculating signal to noise ratio (snr) or bit error rate (BER), these computational methods of Therefore, omited and its interlock circuit structure.
As mentioned above, tuner 601, analog to digital converter 603 and frequency demultiplier 605 can be considered a freq converting circuit 611, therefore the function mode of signal receiving device 600 can be considered: utilize freq converting circuit 611 to convert radiofrequency signal to different frequency one first switching signal and second switching signal (being one first fundamental frequency signal and one second fundamental frequency signal in the present embodiment) respectively, and then the mass parameter of calculating first switching signal and second switching signal is respectively operated under that frequency to determine freq converting circuit 605.Be noted that analog to digital converter 603 can replace to other elements or be omitted because of the difference of processing signals.
Be noted that signal receiving device 600 can use in DVB-T receiving system shown in Figure 1, but be not in order to limit the present invention.Signal receiving device 600 be when can using in other receiving system, if when using in the receiving system of anaiog signal, then can omit digital to analog converter 603.The How It Works of this system described in detail as before, so repeat no more in this.
The above only is preferred embodiment of the present invention, and all equivalences of carrying out according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (7)
1. signal receiving device comprises:
One freq converting circuit in order to receiving a radiofrequency signal, and comes this radiofrequency signal is changed and one first switching signal and one second switching signal of generation respectively according to one first inversion frequency and one second inversion frequency;
One calculation element is coupled to this freq converting circuit, in order to calculate the signal quality parameter of this first switching signal and this second switching signal; And
One control circuit, be coupled to this freq converting circuit and this calculation element, this control circuit according to the signal quality parameter of this first switching signal and this second switching signal to export a control signal, wherein, this control signal is corresponding with the inversion frequency of this freq converting circuit
Wherein this first inversion frequency is that benchmark is added and subtracted a predetermined value with a centre frequency of a required channel signal,
Wherein this freq converting circuit also comprises:
One surface acoustic wave filter is coupled to this control circuit, and in order to adjust the frequency band position of this surface acoustic wave filter according to this control signal, this surface acoustic wave filter is changed an intermediate-freuqncy signal with this radiofrequency signal; And
One frequency demultiplier, in order to converting this intermediate-freuqncy signal to a fundamental frequency signal,
Wherein this control circuit comes the inversion frequency of this freq converting circuit is adjusted according to centre frequency and this predetermined value of this required channel signal,
Wherein this predetermined value is set according to the scope of the bandwidth of this required channel signal, this surface acoustic wave filter and the channel distance that transmits this required channel signal.
2. device as claimed in claim 1, wherein this calculation element calculate the signal to noise ratio of this first switching signal and this second switching signal or bit error rate or its both to determine each signal quality parameter.
3. device as claimed in claim 1, wherein this first switching signal includes this required channel signal and at least one adjacent channel signal.
4. device as claimed in claim 1, the receiving system of composite digital video broadcasting DVB specification and digital audio broadcasting DAB specification.
5. signal acceptance method that is applied on the receiving system, this receiving system comprises a radio frequency change-over circuit, and this method comprises:
Receive a radiofrequency signal;
According to a selected channel, be one first frequency band with a band setting of this radio frequency change-over circuit, wherein this first frequency band is that benchmark is added and subtracted a predetermined value with a centre frequency of a required channel signal, comes the inversion frequency of this radio frequency change-over circuit is adjusted according to centre frequency and this predetermined value of this required channel signal;
This first frequency band according to this radio frequency change-over circuit converts this radiofrequency signal to one first switching signal;
According to this first switching signal to calculate one first mass parameter;
According to should selected channel, be one second frequency band with this band setting of this radio frequency change-over circuit, wherein the position of this first frequency band and this second frequency band is inequality;
This second frequency band according to this radio frequency change-over circuit converts this radiofrequency signal to one second switching signal;
According to this second switching signal to calculate one second mass parameter; And
Determine a target band of this radio frequency change-over circuit according to this first, second mass parameter,
Wherein this radio frequency change-over circuit comprises a surface acoustic wave filter, the filter range of this predetermined value and this surface acoustic wave filter, the bandwidth of this radiofrequency signal, relevant with the channel distance of this radiofrequency signal.
6. method as claimed in claim 5, wherein, calculate the signal to noise ratio of this first switching signal and this second switching signal or bit error rate or its both to determine this first, second mass parameter.
7. method as claimed in claim 5, wherein this first switching signal comprises a channel signal corresponding with this selected channel and at least one adjacent channel signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710196132 CN101453223B (en) | 2007-11-28 | 2007-11-28 | Signal receiving method and related receiving apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710196132 CN101453223B (en) | 2007-11-28 | 2007-11-28 | Signal receiving method and related receiving apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101453223A CN101453223A (en) | 2009-06-10 |
| CN101453223B true CN101453223B (en) | 2013-09-04 |
Family
ID=40735275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710196132 Active CN101453223B (en) | 2007-11-28 | 2007-11-28 | Signal receiving method and related receiving apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101453223B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7187913B1 (en) * | 2002-01-25 | 2007-03-06 | Sige Semiconductor Inc. | Integrated circuit tuner with broad tuning range |
| CN1984414A (en) * | 2005-11-16 | 2007-06-20 | 美国博通公司 | Multimode communication device and method of receiving multiple radio frequency signal therein |
-
2007
- 2007-11-28 CN CN 200710196132 patent/CN101453223B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7187913B1 (en) * | 2002-01-25 | 2007-03-06 | Sige Semiconductor Inc. | Integrated circuit tuner with broad tuning range |
| CN1984414A (en) * | 2005-11-16 | 2007-06-20 | 美国博通公司 | Multimode communication device and method of receiving multiple radio frequency signal therein |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101453223A (en) | 2009-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10615828B2 (en) | Flexible multi-channel wireless audio receiver system | |
| TWI723098B (en) | Method and apparatus for automatic audio alignment in a hybrid radio system | |
| US20090197556A1 (en) | Adjacent channel interference detection apparatus and method | |
| US20120115421A1 (en) | Apparatus and method for automatic replacement of wireless link | |
| US8537284B2 (en) | Adjacent channel power scan | |
| US8213889B2 (en) | Multi-channel receiver and method of reducing interference of the same | |
| KR101040256B1 (en) | System and method for finding direction of signal with improved direction finding accuracy | |
| CN101459481A (en) | General purpose radio for amplitude modulation, frequency modulation and DRM | |
| CN101453223B (en) | Signal receiving method and related receiving apparatus | |
| US8548407B2 (en) | Apparatus to communicate multiple signals from multiple antennas on a single cable | |
| US20170024183A1 (en) | Seamless linking of multiple audio signals | |
| US8090054B2 (en) | Method for receiving signal and apparatus thereof | |
| US20090278994A1 (en) | Method and system for an integrated multi-standard audio/video receiver | |
| US8184741B2 (en) | Multi-system signal receiving device and method thereof | |
| CN101283524A (en) | Method and device for compensating the doppler effect for a digital signal receiver | |
| RU2562423C2 (en) | Method and system for receiving signals from radio station | |
| US8223889B2 (en) | Opportunistic radio frequency communications | |
| JP4530833B2 (en) | Terrestrial digital broadcast signal level adjusting apparatus and television joint receiving method | |
| US20110187938A1 (en) | Multistandard Receiver Circuit For Analogue And Digital Broadcasting | |
| US11902013B2 (en) | Signal processing circuit and signal processing system | |
| EP1566934B1 (en) | OFDM diversity receiver | |
| KR100651835B1 (en) | Digital Multimedia Broadcasting a receiving set | |
| US20060190967A1 (en) | Multi-channel satellite signal receiving apparatus | |
| CN101505159A (en) | Receiving apparatus | |
| JP2010050663A (en) | Broadcast receiver and broadcast receiving method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |