CN106961565A - A kind of tuner of the intelligent information prompting based on DSP single-chip microcomputers - Google Patents
A kind of tuner of the intelligent information prompting based on DSP single-chip microcomputers Download PDFInfo
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- CN106961565A CN106961565A CN201710160172.9A CN201710160172A CN106961565A CN 106961565 A CN106961565 A CN 106961565A CN 201710160172 A CN201710160172 A CN 201710160172A CN 106961565 A CN106961565 A CN 106961565A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
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Abstract
The present invention provides a kind of tuner of the intelligent information prompting based on DSP single-chip microcomputers, including focusing mechanism, low-noise high-frequency amplifier, intermediate frequency amplifying device, gain detection controller, signal noise detection means, decoder, picture noise detection means and central controller, low-noise high-frequency amplifier is electrically connected with focusing mechanism and intermediate frequency amplifying device respectively；Gain detection controller is connected with low-noise high-frequency amplifier and intermediate frequency amplifying device respectively；Signal noise detection means is connected with low-noise high-frequency amplifier and intermediate frequency amplifying device respectively；Decoder is electrically connected with intermediate frequency amplifying device, and decoder is also connected by picture noise detection means with central controller；Central controller is DSP single-chip microcomputers.Compared with the prior art the beneficial effects of the present invention are：The High frequency amplification gain value alpha of the tuner, the first intermediate frequency gain amplifier value β and the second intermediate frequency gain amplifier value γ can carry out real-time update according to noise coefficient, and interference of the noise to vision signal can be eliminated immediately.
Description
Technical field
The present invention relates to high-frequency electromagnetic signal reception technique field, and in particular to a kind of intelligence letter based on DSP single-chip microcomputers
Cease the tuner of prompting.
Background technology
Tuner is that television set is used for receiving high-frequency signal and demodulates a kind of device of video information.Current television set makes
Tuner is generally divided into data signal tuner and analog signal tuner, and wherein data signal tuner referred to as numeral is high
Frequency head, analog signal tuner referred to as simulation tuner.
Tuner includes tuner, high-frequency signal amplifier and the satellite television decoder for receiving TV signal.High frequency
Head is in application process, because microwave signal is weaker, it is necessary to which supporting the use satellite pot carries out signal focus, the peace thus brought
Debugging efforts and noise problem are filled, is always the problem for perplexing domestic consumer.Even if by tuner and for finding satellite
Search the collocation of star instrument to use, the focusing work of high frequency is also abnormal troublesome.Layman can not carry out debugging efforts.
In addition, if signal is received and broken down during demodulating, domestic consumer is can not to judge the event of tuner part
Barrier or signal transmission failure, are often at a loss.
In view of drawbacks described above, creator of the present invention obtains the present invention finally by prolonged research and practice.
The content of the invention
To solve above-mentioned technological deficiency, the technical solution adopted by the present invention is that the present invention provides a kind of based on DSP monolithics
The tuner of the intelligent information prompting of machine, it includes focusing mechanism, low-noise high-frequency amplifier, intermediate frequency amplifying device, gain inspection
Survey controller, signal noise detection means, decoder, picture noise detection means and central controller, the focusing mechanism, for
Match somebody with somebody and receive satellite-signal；The low-noise high-frequency amplifier is electrically connected with the focusing mechanism and the intermediate frequency amplifying device respectively
Connect；The gain detection controller is connected with the low-noise high-frequency amplifier and the intermediate frequency amplifying device respectively；The letter
Number noise detection apparatus is connected with the low-noise high-frequency amplifier and the intermediate frequency amplifying device respectively；The decoder and institute
The electrical connection of intermediate frequency amplifying device is stated, the decoder is also connected by described image noise detection apparatus with the central controller；Institute
Central controller is stated also to be connected with gain detection controller, the signal noise detection means and the focusing mechanism respectively.
Preferably, the intermediate frequency amplifying device includes wave filter, the first frequency mixer, the first intermediate frequency amplifier, the second mixing
Device, the second intermediate frequency amplifier, the first local oscillator and the second local oscillator, the wave filter respectively with the low noise sound pitch
Audio amplifier and first frequency mixer connection；First frequency mixer also respectively with first intermediate frequency amplifier and described
One local oscillator is electrically connected；Second frequency mixer respectively with first intermediate frequency amplifier, second intermediate frequency amplifier
With the connection of the second local oscillator, second intermediate frequency amplifier is also connected with the decoder.
Preferably, the gain detection controller includes the first gain controller, the second gain controller and the 3rd gain
Controller, first gain controller, second gain controller and the 3rd gain controller respectively with it is described in
Control device connection；First gain controller is also electrically connected with the low-noise high-frequency amplifier, for controlling High frequency amplification to increase
Beneficial value α；Second gain controller is also electrically connected with first intermediate frequency amplifier, for controlling the first intermediate frequency gain amplifier
Value β；3rd gain controller is also electrically connected with second intermediate frequency amplifier, for the second intermediate frequency gain amplifier value γ.
Preferably, the signal noise detection means includes the first noise detection apparatus, the second noise detection apparatus and the
Three noise detection apparatus, first noise detection apparatus, second noise detection apparatus and the 3rd noise measuring dress
Put and be connected respectively with the central controller；First noise detection apparatus is also electrically connected with the low-noise high-frequency amplifier, is used
In detection High frequency amplification signal Y (t) noise coefficient Da；First intermediate frequency amplifier described in second noise detection apparatus is electrically connected
Connect, the noise coefficient D for detecting the first intermediate frequency amplification signal Z ' (t)b；3rd noise detection apparatus is used to detect second
Intermediate frequency amplification signal Q (t) noise coefficient Dc。
Preferably, the noise coefficient D of the High frequency amplification signal Y (t)aComputing formula be：
Wherein, DaFor the noise coefficient of the High frequency amplification signal Y (t), M represents High frequency amplification signal Y (t) neutron
The quantity of carrier wave, RM(t) it is the subcarrier in the High frequency amplification signal Y (t)；
The noise coefficient D of the first intermediate frequency amplification signal Z ' (t)bComputing formula：
Wherein, DbAmplify signal Z ' (t) noise coefficient for first intermediate frequency, M represents the first intermediate frequency amplification letter
The quantity of number Z ' (t) sub-carriers, NM(t) subcarrier in signal Z ' (t) is amplified for first intermediate frequency, B is equivalent noise
Bandwidth；
Second intermediate frequency amplification signal Q ' (t) noise coefficient is expressed as：
Wherein, DcAmplify signal Q (t) noise coefficient for second intermediate frequency, M represents the second intermediate frequency amplification signal
The quantity of Q (t) sub-carriers, UM(t) subcarrier in signal Z ' (t) is amplified for second intermediate frequency, C is equivalent noise band
It is wide.
Preferably, the High frequency amplification gain value alpha more new formula is：
Wherein α represents the High frequency amplification yield value after updating, the High frequency amplification yield value before α ' expressions renewal, DaTo be described
High frequency amplification signal Y (t) noise coefficient, TeRepresent equivalent noise temperature, T0Represent normal room temperature, kaRepresent that the high frequency is put
Big signal Y (t) dutycycle；
The renewal computing formula of the first intermediate frequency gain amplifier value β is：
Wherein β represent update after the first intermediate frequency gain amplifier value, β ' expressions update before the first intermediate frequency gain amplifier value,
DbAmplify signal Z ' (t) noise coefficient, T for first intermediate frequencyeRepresent equivalent noise temperature, T0Represent normal room temperature, kbTable
Show that the first intermediate frequency amplifies signal Z ' (t) dutycycle；
The second intermediate frequency gain amplifier value γ updates computing formula：
Wherein γ represents the second intermediate frequency gain amplifier value after updating, the second intermediate frequency gain amplifier before γ ' expressions renewal
Value, DcAmplify signal Q (t) noise coefficient, T for second intermediate frequencyeRepresent equivalent noise temperature, T0Represent normal room temperature, kc
Represent that the second intermediate frequency amplifies signal Q (t) dutycycle.
Preferably, described image noise detection apparatus includes sampling module, abstraction module, grey scale difference detection module is made an uproar
Sound threshold device and decision maker, the sampling module are connected with the decoder and the abstraction module respectively, the gray scale
Differential Detection module is connected with the abstraction module and the noise gate device respectively, the decision maker respectively with it is described in
Control device and noise gate device electrical connection.
Preferably, the grey scale difference detection module, the ash for calculating all regions that the abstraction module is drawn into
Degree is checked the mark gradient, and the check the mark computing formula of gradient of the gray scale is：
Wherein, H be grey scale difference gradient function value, f (i, j) be i, the gray value of j pixels, l and w are respectively that image is long
With wide max pixel value.
Preferably, the central controller includes DSP single-chip microcomputers and isolating device, the isolating device is used to isolate low frequency signal
With high frequency signal.
Preferably, it, which also includes satellite-signal, detects indicator lamp and signal strength sensors, the signal strength sensors
Electrically connected with the focusing mechanism, for detecting the signal intensity received, the satellite-signal detection indicator lamp and the letter
Number intensity sensor respectively with the DSP monolithics mechatronics；When signal intensity meets signal strength threshold, the DSP is mono-
Piece machine controls the satellite-signal detection indicator lamp to light.
Compared with the prior art the beneficial effects of the present invention are：A kind of intelligence based on DSP single-chip microcomputers that the present invention is provided
The High frequency amplification gain value alpha of the tuner of energy information alert, the first intermediate frequency gain amplifier value β and the second intermediate frequency gain amplifier value γ
Real-time update can be carried out according to noise coefficient, interference of the noise to vision signal can be eliminated immediately.DSP single-chip microcomputers should be based on
Intelligent information prompting tuner its internal fault position can also be judged according to noise coefficient.A kind of base that the present invention is provided
The tuner pointed out in the intelligent information of DSP single-chip microcomputers can be with satellite auto-focusing.
Brief description of the drawings
, below will be to being wanted needed for embodiment description in order to illustrate more clearly of the technical scheme in various embodiments of the present invention
The accompanying drawing used is briefly described.
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the internal structure schematic diagram of gain detection controller and signal noise detection means in the present invention；
Fig. 3 is picture noise detection means internal structure schematic diagram in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the technical characteristic above-mentioned and other to the present invention and advantage are described in more detail.
Embodiment 1
As shown in figure 1, being the structural representation of the present invention.
The present invention provide it is a kind of based on DSP single-chip microcomputers intelligent information prompting tuner, it include focusing mechanism 10,
Low-noise high-frequency amplifier 15, intermediate frequency amplifying device 20, gain detection controller 30, signal noise detection means 40, decoder
50th, picture noise detection means 60, central controller 70.
Focusing mechanism 10, for matching the frequency of docking of tuner and satellite, and receives satellite-signal X (t).
Low-noise high-frequency amplifier 15 is electrically connected with focusing mechanism 10.Because the satellite-signal received is microwave signal,
Therefore, low-noise high-frequency amplifier 15 is used for the amplitude and power for increasing the microwave signal X (t) received, microwave signal X (t)
It is changed into High frequency amplification signal Y (t) after High frequency amplification.Low-noise high-frequency amplifier 15 also by High frequency amplification signal Y (t) transmit to
Intermediate frequency amplifying device 20.High frequency amplification yield value is α.
Intermediate frequency amplifying device 20 is electrically connected with low-noise high-frequency amplifier 15, mixed for High frequency amplification signal Y (t) to be passed through
The mode of frequency carries out down conversion process.Intermediate frequency amplifying device 20 includes wave filter 201, the first frequency mixer 202, the first intermediate frequency amplifier
203rd, the second frequency mixer 204, the second intermediate frequency amplifier 205, the first local oscillator 206 and the second local oscillator 207.
Wave filter 201 is used to carry out bandpass filtering to High frequency amplification signal Y (t), filters by the interference signal of High frequency amplification.
Wave filter 201 is electrically connected with low-noise high-frequency amplifier 15.Filtered signal is expressed as Y ' (t).
First local oscillator 206 is used to provide local oscillated signal for the first frequency mixer 202.
First frequency mixer 202 is connected with the local oscillator 206 of wave filter 201 and first respectively.First frequency mixer 202 will filter
Signal Y ' (t) after ripple provides local oscillated signal with the first local oscillator 206 and is mixed.During high-frequency signal is converted to
Frequency signal, facilitates the demodulation of signal.The first mixed frequency signal after being exported through the first frequency mixer 202 is expressed as Z (t).First mixing
Device 202 transmits the first mixed frequency signal Z (t) to the first intermediate frequency amplifier 203.
First intermediate frequency amplifier 203 is electrically connected with the first frequency mixer 202, according to the first intermediate frequency gain amplifier value β by first
Mixed frequency signal Z (t) carries out intermediate frequency amplification, improves the first mixed frequency signal Z (t) amplitudes.After being exported through the first intermediate frequency amplifier 203
First intermediate frequency amplification signal is expressed as Z ' (t).First intermediate frequency amplifier 203 is also connected with the second frequency mixer 204, and the first intermediate frequency is put
First intermediate frequency is amplified signal Z ' (t) by big device 203 to be transmitted to the second frequency mixer 204.
Second local oscillator 207 is used to provide local oscillated signal for the second frequency mixer 204.
Second frequency mixer 204 is connected with the first intermediate frequency amplifier 203 and the second local oscillator 207 respectively, the second mixing
First intermediate frequency amplification signal Z ' (t) local oscillated signals provided with the second local oscillator 207 are mixed by device 204.Through
Second mixed frequency signal of the second frequency mixer 204 output is expressed as Q (t).Second frequency mixer 204 transmits the second mixed frequency signal Q (t)
To the second intermediate frequency amplifier 205.
Second intermediate frequency amplifier 205 is electrically connected with the second frequency mixer 204, according to the second intermediate frequency gain amplifier value γ by second
Mixed frequency signal Q (t) carries out intermediate frequency amplification, improves the second mixed frequency signal Q (t) amplitude.After being exported through the second intermediate frequency amplifier 205
The second intermediate frequency amplification signal be expressed as Q ' (t).Second intermediate frequency amplifier 205 by the second intermediate frequency amplify signal Q ' (t) transmit to
Decoder 50, is further decoded.
As shown in Fig. 2 being the internal structure schematic diagram of gain detection controller and signal noise detection means in the present invention.
Gain detection controller 30 is used for control low-noise high-frequency amplifier 15, the first intermediate frequency amplifier 203 and the respectively
The gain amplifier value of two intermediate frequency amplifiers 205.Gain detection controller 30 includes the first gain controller 301, the second gain control
The gain controller 303 of device 302 and the 3rd processed.First gain controller 301 is electrically connected with low-noise high-frequency amplifier 15, and first increases
Beneficial controller 301 controls the High frequency amplification gain value alpha of low-noise high-frequency amplifier 15.In second gain controller 302 and first
Audio amplifier 203 is electrically connected, and the second gain controller 302 controls the first intermediate frequency gain amplifier value of the first intermediate frequency amplifier 203
β.3rd gain controller 303 and the second intermediate frequency amplifier 205 are connected, and the 3rd gain controller 303 controls the amplification of the second intermediate frequency
Second intermediate frequency gain amplifier value γ of device 205.
Signal noise detection means 40, for detecting through low-noise high-frequency amplifier 15, the first intermediate frequency amplifier 203 and
Noise in the signal of two intermediate frequency amplifiers 205 amplification.Signal noise detection means 40 include the first noise detection apparatus 401,
Second noise detection apparatus 402 and the 3rd noise detection apparatus 403.First noise detection apparatus 401 and low noise High frequency amplification
Device 15 is connected, and the first noise detection apparatus 401 can detect High frequency amplification signal Y (t) noise and noise coefficient.Second noise
Detection means 402 is connected with the first intermediate frequency amplifier 203, and the second noise detection apparatus 402 can detect the first intermediate frequency amplification letter
Number Z ' (t) noise and noise coefficient.3rd noise detection apparatus 403 and the second intermediate frequency amplifier 205 are connected, the inspection of the 3rd noise
Surveying device 403 can detect that the second intermediate frequency amplifies signal Q ' (t) noise and noise coefficient.
High frequency amplification signal Y (t) noise coefficient is expressed as:
Wherein, DaFor High frequency amplification signal Y (t) noise coefficient, M represents the number of High frequency amplification signal Y (t) sub-carriers
Amount, RM(t) it is the subcarrier in High frequency amplification signal Y (t).Its advantage is that calculating high frequency by subcarrier function puts
Big signal Y (t) noise coefficient can avoid the erroneous judgement of the noise in signal, improve the accuracy that noise judges.
First intermediate frequency amplification signal Z ' (t) noise coefficient is expressed as：
Wherein, DbAmplify signal Z ' (t) noise coefficient for the first intermediate frequency, M represents that the first intermediate frequency amplifies in signal Z ' (t)
The quantity of subcarrier, NM(t) subcarrier in signal Z ' (t) is amplified for the first intermediate frequency, B is equivalent noise bandwidth.Its beneficial effect
Fruit is that the noise coefficient for calculating the first intermediate frequency amplification signal Z ' (t) by subcarrier function can avoid the noise in signal
Erroneous judgement, improve noise judge accuracy.
Second intermediate frequency amplification signal Q ' (t) noise coefficient is expressed as：
Wherein, DcAmplify signal Q (t) noise coefficient for the second intermediate frequency, M represents that the second intermediate frequency amplifies signal Q (t) neutron
The quantity of carrier wave, UM(t) subcarrier in signal Z ' (t) is amplified for the second intermediate frequency, C is equivalent noise bandwidth.Its advantage
It is that the noise coefficient for calculating the second intermediate frequency amplification signal Q (t) by subcarrier function can avoid the mistake of the noise in signal
Sentence, improve the accuracy that noise judges.
Decoder 50, for multicarrier Composite Video Baseband Signal to be converted into digital video signal.50 points of decoder
It is not connected with the intermediate frequency amplifier 205 of picture noise detection means 60 and second.
As shown in figure 3, being picture noise detection means internal structure schematic diagram in the present invention.
Picture noise detection means 60 is used to detect the noise through the decoded digital video signal of decoder 50.It includes
Sampling module 61, abstraction module 62, grey scale difference detection module 63, noise gate device 64, decision maker 65.
Sampling module 61, sampling module 61 is electrically connected with decoder 50, for being gathered according to sample frequency through decoder 50
Digital video signal picture after conversion.Sampling module 61 is also by the picture transmission of collection to abstraction module 62.
Abstraction module 62, each frame picture for sampling module 61 to be gathered splits into the region of predetermined number, enters
Row noise analysis.Abstraction module 62 is electrically connected with grey scale difference detection module 63, and the regional display of extraction is transmitted to gray scale
Differential Detection module 63.
Grey scale difference detection module 63, checks the mark gradient for calculating the gray scale in all regions that abstraction module 62 is drawn into,
The check the mark computing formula of gradient of the gray scale is：
Wherein, H be grey scale difference gradient function value, f (i, j) be i, the gray value of j pixels, l and w are respectively that image is long
With wide max pixel value.Its advantage is that it is possible to efficiently find out the pulse that brightness is higher and appearance is more, therefore
Speckle noise signal can quickly and accurately be recognized.
Noise gate device 64, the root-mean-square value setting noise gate for gradient of being checked the mark according to the gray scale in all regions.
Noise gate device 64 is connected with grey scale difference detection module 63.
Decision maker 65, noise gate described in digital signal noise is compared, and judges digital signal noise situation.Judge
Device 65 is electrically connected with decoder 50 and noise gate device 64 respectively.
Central controller 70 is made an uproar with focusing mechanism 10, gain detection controller 30, signal noise detection means 40 and image respectively
Sound detection device 60 is electrically connected.
The signal noise detection means 40 of central controller 70 is electrically connected, and signal noise detection means 40 is by High frequency amplification signal Y (t)
Noise coefficient Da, the first intermediate frequency amplification signal Z ' (t) noise coefficient Db, the second intermediate frequency amplification signal Q (t) noise coefficient Dc
Transmit to central controller 70.Central controller 70 is by High frequency amplification signal Y (t) noise coefficient DaTransmit to low-noise high-frequency amplifier
15, for changing High frequency amplification gain value alpha.First intermediate frequency is amplified signal Z ' (t) noise coefficient D by central controller 70bTransmit to
One intermediate frequency amplifier 203, for changing the first intermediate frequency gain amplifier value β.Second intermediate frequency is also amplified signal Q (t) by central controller 70
Noise coefficient DcTransmit to the second intermediate frequency amplifier 205, for changing the second intermediate frequency gain amplifier value γ.
Central controller 70 detects controller 30 to change High frequency amplification gain value alpha, the first intermediate frequency gain amplifier value β by gain
With the second intermediate frequency gain amplifier value γ.High frequency amplification gain value alpha can be according to High frequency amplification signal Y (t) noise coefficient DaValue
Carry out real-time update.First intermediate frequency gain amplifier value β can amplify signal Z ' (t) noise coefficient D according to the first intermediate frequencybValue is carried out
Real-time update.Second intermediate frequency gain amplifier value γ can amplify signal Q (t) noise coefficient D according to the second intermediate frequencycValue carries out real
Shi Gengxin.
High frequency amplification yield value more new formula is：
Wherein α represents the High frequency amplification yield value after updating, the High frequency amplification yield value before α ' expressions renewal, DaFor high frequency
Amplify signal Y (t) noise coefficient, TeRepresent equivalent noise temperature, T0Represent normal room temperature, kaRepresent High frequency amplification signal Y
(t) dutycycle.
First intermediate frequency gain amplifier value more new formula is：
Wherein β represent update after the first intermediate frequency gain amplifier value, β ' expressions update before the first intermediate frequency gain amplifier value,
DbAmplify signal Z ' (t) noise coefficient, T for the first intermediate frequencyeRepresent equivalent noise temperature, T0Represent normal room temperature, kbRepresent the
One intermediate frequency amplification signal Z ' (t) dutycycle.
Second intermediate frequency gain amplifier value more new formula is：
Wherein γ represents the second intermediate frequency gain amplifier value after updating, the second intermediate frequency gain amplifier before γ ' expressions renewal
Value, DcAmplify signal Q (t) noise coefficient, T for the second intermediate frequencyeRepresent equivalent noise temperature, T0Represent normal room temperature, kcRepresent
Second intermediate frequency amplification signal Q (t) dutycycle.
The real-time update of High frequency amplification yield value, the first intermediate frequency gain amplifier value and the second intermediate frequency gain amplifier value, it has
Beneficial effect is that gain can be adjusted in real time, can reduce influence of the signal noise to decoded picture step by step, can
The snowflake noise for characterizing the picture televised out is relatively minimal, so as to reduce the snowflake of broadcasting pictures, improves picture
Quality.
Central controller 70 is electrically connected with focusing mechanism 10 and picture noise detection means 60 respectively.Central controller 70 is made an uproar according to image
The picture noise detection result of determination of sound detection device 60, the matching frequency of adjustment focusing mechanism 10 and satellite-signal, to make
Tuner can with the automatic accurate focusing of satellite,.
Broken down if signal is received, central controller 70 can be by High frequency amplification signal Y (t) noise coefficient Da,
One intermediate frequency amplification signal Z ' (t) noise coefficient Db, the second intermediate frequency amplification signal Q (t) noise coefficient DcIt is quick to judge that tuner goes out
The part of existing failure.
Central controller 70 includes DSP single-chip microcomputers, because DSP single-chip microcomputers working frequency is low frequency, what tuner was received and handled
Signal is high frequency signal, and to avoid influencing each other for signal, therefore central controller 70 also includes isolating device.Isolating device is used
In isolation low frequency signal and high frequency signal.
A kind of tuner of intelligent information prompting based on DSP single-chip microcomputers of the present invention also includes satellite-signal and detected
Indicator lamp and signal strength sensors, signal strength sensors are electrically connected with focusing mechanism 10, for detecting the signal received
Intensity.Satellite-signal detect indicator lamp and signal strength sensors respectively with DSP monolithic mechatronics.DSP single-chip microcomputers are by signal
The signal intensity that intensity sensor is got is contrasted with the signal intensity given tacit consent to, when signal intensity meets signal strength threshold
When, DSP Single-chip Controllings satellite-signal detection indicator lamp is lighted.
Presently preferred embodiments of the present invention is the foregoing is only, is merely illustrative for the purpose of the present invention, and it is non-limiting
's.Those skilled in the art understands, many changes can be carried out to it in the spirit and scope that the claims in the present invention are limited,
Modification, in addition it is equivalent, but fall within protection scope of the present invention.
Claims (10)
1. a kind of tuner of the intelligent information prompting based on DSP single-chip microcomputers, it is characterised in that including focusing mechanism, low noise
High-frequency amplifier, intermediate frequency amplifying device, gain detection controller, signal noise detection means, decoder, picture noise detection dress
Put and central controller, the focusing mechanism, for matching and receiving satellite-signal；The low-noise high-frequency amplifier respectively with it is described
Focusing mechanism and intermediate frequency amplifying device electrical connection；Gain detection controller respectively with the low-noise high-frequency amplifier
With intermediate frequency amplifying device connection；The signal noise detection means respectively with the low-noise high-frequency amplifier and it is described in
Frequency amplifying device is connected；The decoder is electrically connected with the intermediate frequency amplifying device, and the decoder is also made an uproar by described image
Sound detection device is connected with the central controller；The central controller also detects controller, the signal noise with the gain respectively
Detection means and focusing mechanism connection.
2. tuner as claimed in claim 1, it is characterised in that the intermediate frequency amplifying device includes wave filter, the first mixing
Device, the first intermediate frequency amplifier, the second frequency mixer, the second intermediate frequency amplifier, the first local oscillator and the second local oscillator, institute
Wave filter is stated to be connected with the low-noise high-frequency amplifier and first frequency mixer respectively；First frequency mixer also respectively with
First intermediate frequency amplifier and first local oscillator electrical connection；Second frequency mixer respectively with first intermediate frequency
Amplifier, second intermediate frequency amplifier and the second local oscillator connection, second intermediate frequency amplifier also with the decoding
Device is connected.
3. tuner as claimed in claim 2, it is characterised in that the gain detection controller is controlled including the first gain
Device, the second gain controller and the 3rd gain controller, first gain controller, second gain controller and described
3rd gain controller is connected with the central controller respectively；First gain controller also with the low-noise high-frequency amplifier
Electrical connection, for controlling High frequency amplification gain value alpha；Second gain controller is also electrically connected with first intermediate frequency amplifier
Connect, for controlling the first intermediate frequency gain amplifier value β；3rd gain controller is also electrically connected with second intermediate frequency amplifier
Connect, for the second intermediate frequency gain amplifier value γ.
4. tuner as claimed in claim 3, it is characterised in that the signal noise detection means includes the first noise measuring
Device, the second noise detection apparatus and the 3rd noise detection apparatus, first noise detection apparatus, second noise measuring
Device and the 3rd noise detection apparatus are connected with the central controller respectively；First noise detection apparatus also with it is described low
Noise high frequency amplifier is electrically connected, the noise coefficient D for detecting High frequency amplification signal Y (t)a；The second noise measuring dress
Put the first intermediate frequency amplifier electrical connection, the noise coefficient D for detecting the first intermediate frequency amplification signal Z ' (t)b；Described 3rd
Noise detection apparatus is used for the noise coefficient D for detecting the second intermediate frequency amplification signal Q (t)c。
5. tuner as claimed in claim 4, it is characterised in that the noise coefficient D of the High frequency amplification signal Y (t)aMeter
Calculating formula is：
Wherein, DaFor the noise coefficient of the High frequency amplification signal Y (t), M represents High frequency amplification signal Y (t) sub-carriers
Quantity, RM(t) it is the subcarrier in the High frequency amplification signal Y (t)；
The noise coefficient D of the first intermediate frequency amplification signal Z ' (t)bComputing formula：
Wherein, DbAmplify signal Z ' (t) noise coefficient for first intermediate frequency, M represents the first intermediate frequency amplification signal Z '
(t) quantity of sub-carriers, NM(t) subcarrier in signal Z ' (t) is amplified for first intermediate frequency, B is equivalent noise bandwidth；
Second intermediate frequency amplification signal Q ' (t) noise coefficient is expressed as：
Wherein, DcAmplify signal Q (t) noise coefficient for second intermediate frequency, M represents the second intermediate frequency amplification signal Q (t)
The quantity of sub-carriers, UM(t) subcarrier in signal Z ' (t) is amplified for second intermediate frequency, C is equivalent noise bandwidth.
6. tuner as claimed in claim 5, it is characterised in that the High frequency amplification gain value alpha more new formula is：
Wherein α represents the High frequency amplification yield value after updating, the High frequency amplification yield value before α ' expressions renewal, DaFor the high frequency
Amplify signal Y (t) noise coefficient, TeRepresent equivalent noise temperature, T0Represent normal room temperature, kaRepresent the High frequency amplification letter
Number Y (t) dutycycle；
The renewal computing formula of the first intermediate frequency gain amplifier value β is：
Wherein β represents the first intermediate frequency gain amplifier value after updating, the first intermediate frequency gain amplifier value before β ' expressions renewal, DbFor
The noise coefficient of the first intermediate frequency amplification signal Z ' (t), TeRepresent equivalent noise temperature, T0Represent normal room temperature, kbRepresent the
One intermediate frequency amplification signal Z ' (t) dutycycle；
The second intermediate frequency gain amplifier value γ updates computing formula：
Wherein γ represents the second intermediate frequency gain amplifier value after updating, the second intermediate frequency gain amplifier value before γ ' expressions renewal, Dc
Amplify signal Q (t) noise coefficient, T for second intermediate frequencyeRepresent equivalent noise temperature, T0Represent normal room temperature, kcRepresent
Second intermediate frequency amplification signal Q (t) dutycycle.
7. the tuner as described in claim 1-6 is any, it is characterised in that described image noise detection apparatus includes sampling mould
Block, abstraction module, grey scale difference detection module, noise gate device and decision maker, the sampling module respectively with the solution
Code device and abstraction module connection, the grey scale difference detection module are filled with the abstraction module and the noise gate respectively
Connection is put, the decision maker is electrically connected with the central controller and the noise gate device respectively.
8. tuner as claimed in claim 7, it is characterised in that the grey scale difference detection module, for calculating described take out
The gray scale in all regions that modulus block is drawn into is checked the mark gradient, and the check the mark computing formula of gradient of the gray scale is：
Wherein, H be grey scale difference gradient function value, f (i, j) be i, the gray value of j pixels, l and w are respectively image length and width
Max pixel value.
9. tuner as claimed in claim 8, it is characterised in that the central controller includes DSP single-chip microcomputers and isolating device, institute
Stating isolating device is used to isolate low frequency signal and high frequency signal.
10. tuner as claimed in claim 9, it is characterised in that it also includes satellite-signal and detects that indicator lamp and signal are strong
Sensor is spent, the signal strength sensors are electrically connected with the focusing mechanism, it is described for detecting the signal intensity received
Satellite-signal detect indicator lamp and the signal strength sensors respectively with the DSP monolithics mechatronics；When signal intensity is full
During sufficient signal strength threshold, satellite-signal detection indicator lamp is lighted described in the DSP Single-chip Controllings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160172.9A CN106961565A (en) | 2017-03-17 | 2017-03-17 | A kind of tuner of the intelligent information prompting based on DSP single-chip microcomputers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160172.9A CN106961565A (en) | 2017-03-17 | 2017-03-17 | A kind of tuner of the intelligent information prompting based on DSP single-chip microcomputers |
Publications (1)
| Publication Number | Publication Date |
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| CN106961565A true CN106961565A (en) | 2017-07-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0720800A1 (en) * | 1993-09-22 | 1996-07-10 | Deutsche Thomson-Brandt Gmbh | High-frequency receiver |
| CN2912171Y (en) * | 2006-06-06 | 2007-06-13 | 海信集团有限公司 | TV set having integrated fault auto checking and alarming circuit |
| CN201075824Y (en) * | 2007-08-14 | 2008-06-18 | 青岛海信电器股份有限公司 | Antenna feeding circuit |
| US7499087B2 (en) * | 2002-06-13 | 2009-03-03 | Panasonic Corporation | Noise reducing device and noise reducing method |
| CN102324946A (en) * | 2011-06-10 | 2012-01-18 | 武汉理工大学 | The high intermediate frequency front-end circuit of numerical control short-wave receiver |
| CN105450954A (en) * | 2014-08-29 | 2016-03-30 | Tcl海外电子（惠州）有限公司 | High-frequency tuner automatic gain control (AGC) circuit and method |
-
2017
- 2017-03-17 CN CN201710160172.9A patent/CN106961565A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0720800A1 (en) * | 1993-09-22 | 1996-07-10 | Deutsche Thomson-Brandt Gmbh | High-frequency receiver |
| US7499087B2 (en) * | 2002-06-13 | 2009-03-03 | Panasonic Corporation | Noise reducing device and noise reducing method |
| CN2912171Y (en) * | 2006-06-06 | 2007-06-13 | 海信集团有限公司 | TV set having integrated fault auto checking and alarming circuit |
| CN201075824Y (en) * | 2007-08-14 | 2008-06-18 | 青岛海信电器股份有限公司 | Antenna feeding circuit |
| CN102324946A (en) * | 2011-06-10 | 2012-01-18 | 武汉理工大学 | The high intermediate frequency front-end circuit of numerical control short-wave receiver |
| CN105450954A (en) * | 2014-08-29 | 2016-03-30 | Tcl海外电子（惠州）有限公司 | High-frequency tuner automatic gain control (AGC) circuit and method |
Non-Patent Citations (2)
| Title |
|---|
| 谈文心: "《高频电子线路》", 31 October 1996 * |
| 高如云: "《通信电子线路》", 29 February 2016 * |
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Application publication date: 20170718 |