CN1728787A - Method for determining whether there is digital signal in digital TV set - Google Patents
Method for determining whether there is digital signal in digital TV set Download PDFInfo
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- CN1728787A CN1728787A CNA200410053169XA CN200410053169A CN1728787A CN 1728787 A CN1728787 A CN 1728787A CN A200410053169X A CNA200410053169X A CN A200410053169XA CN 200410053169 A CN200410053169 A CN 200410053169A CN 1728787 A CN1728787 A CN 1728787A
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Abstract
The method carries out following flow: if signal received from each channel, the method determines PWL (Power Level) of kernel point setup in advance at specific location of the said each received signal, and determines whether the PWL value is within critical range; if yes, then determining whether deviation of PWL value is within critical range setup in advance; if yes, then the said input signal is determined as digital signal. The method ensures that decoding function is operated only for meaningful digital signal so as to guarantee stability and service time of chip.
Description
Technical field
The present invention relates to the method that a kind of Digital Television judges that whether digital signal exists, during the Digital Television auto channel search, VSB (vestigial sideband amplitudemodulation)/QAM (quadrature amplitude modulation) decoder judges that whether digital signal exists.
Background technology
Along with the development of digital Age,, also carry out the relevant work of standards for digital broadcasting in high gear in the television broadcasting field.Buy Digital Television, during initial the installation or when moving at every turn, in order to grasp the state of network (network), Digital Television starts the relevant internal memory memory function that can receive effective channel information, and this is called ACS (Auto-channel scan auto channel search).The channel information of above-mentioned search is stored in the internal memory of above-mentioned Digital Television inside, makes the relevant above-mentioned information of startup action reference of channel of Digital Television.
In general, the default channel quantity of Digital Television will reach tens times of simulated television, and factor word TV provides tens, even a hundreds of channel, and the leeway that the user selects is more, and simultaneously, it is complicated more that its program selection operation method also becomes.
Because of such factor, the user is with reference to each channel additional information of accepting from the outside, only registers in the above-mentioned digital TV channel some and likes the specific channel watched, and the situation of only appreciating the registry channel program is comparatively general.
That is to say, but during the initial purchase Digital Television or in using in order to confirm viewing channel, the user uses the function of auto channel search.
During the Digital Television tuning in to channels, decoder receiving inputted signal that can decoded digital signal, and, judge whether normally receiving digital signals of channel correlation by multistage decode procedure.
That is to say that to each channel, above-mentioned decoder judges that whether signal exists, if there is signal in channel correlation, just judges that whether the normal signal of channel correlation exists.That is, above-mentioned decoder the digital signal of input, analog signal, without any the signal of meaning through decode procedure, even signal has no when existence, also passes through decode procedure, judges that whether the normal signal of channel correlation exists.
But there is such problem in above-mentioned current technology, promptly can only judge from the signal of terminal input whether to exist, and can not respond to digital VSB/QAM signal, therefore, can not use effectively.
In addition, the VSB/QAM decoder is an example, though have the chip of processing digital signal, during Digital Television operation auto channel search function, to all signals, carry out VSB or QAM earlier and set, after decoding afterwards, judge that whether channel exists, therefore, have the long problem of required time.
In addition, utilize and only judge the BLOCK (functional block) whether input signal exists in the chip functions before this, in the automatic search procedure of channel, save time, but because of not being that the analog signal of digital signal or noise are when being present in tuning in to channels, also be judged as signal and exist, to channel unnecessary, the time of waste decoding.
In addition, not the analog signal of digital signal, insignificant signal, even under the signal situation that has no to exist, also pass through the decode procedure of decoder, therefore, whether channel correlation is existed the judgement of normal signal, also need the time, and influence the chip service time and the performance thereof of decoder.
Summary of the invention
Therefore, the objective of the invention is to, during channel searching, shorten decoder to channel, the channel that does not have signal, decoding stand-by period, provide to the user to make the skimble-skamble stand-by period become the method whether the shortest Digital Television judgement digital signal exists with channel of meaningless signal with analog signal.
Other purpose of the present invention is, only to having the digital signal operation decoding function of meaning, provides the stability and the Digital Television of service time that can guarantee chip to judge the method whether digital signal exists.
According to a side of the present invention, in order to achieve the above object, during the Digital Television auto channel search, judge that the method whether digital signal exists has following characteristics: if from each channel received signal, ad-hoc location to above-mentioned received signal, confirm to set in advance the PWL (Power Level energy level) of core point, judge whether above-mentioned each PWL value belongs in the critical range.If above-mentioned judged result is that above-mentioned each PWL value belongs in its critical range, judge then whether the PWL value deviation of above-mentioned each core point belongs in the deviation range of setting in advance.Above-mentioned judged result if the PWL value deviation of above-mentioned each core point belongs in the deviation range of setting in advance, is a digital signal with above-mentioned input-signal judging.
The method whether the judgement digital signal exists also comprises the stage of the digital signal induction information that stores above-mentioned judgement.
Above-mentioned digital signal induction information is a channel number.
The ad-hoc location of above-mentioned received signal is the center of the 2nd intermediate frequency signal, and the above-mentioned core point of setting in advance is meant that the center with above-mentioned the 2nd intermediate frequency signal is the point of the left and right sides certain distance of standard.
If the PWL value of above-mentioned each core point does not belong in the critical field, just receive the signal of next channel, judge that whether digital signal exists; If the PWL value deviation of above-mentioned each core point does not belong in the deviation range of setting in advance, just receive next channel signals, judge that whether digital signal exists.
As mentioned above, because of the present invention has increased the digital signal inducing function, during channel searching, shortened the decoding stand-by period of decoder, can provide the method whether the shortest Digital Television judgement digital signal of blindly stand-by period change is existed to the user to no signal channel, analog signal channel, meaningless signal channel.
In addition, according to the present invention, to having the digital signal operation decoding function of meaning, can give security chip stability and the Digital Television of service time are judged the method whether digital signal exists because of only.
Description of drawings
Fig. 1 is the example more satisfactory according to the present invention, roughly shows the integration map of Digital Television structure.
Fig. 2 is the example more satisfactory according to the present invention, shows that specifically decoder judges the integration map whether digital signal of channel exists.
Fig. 3 is the example more satisfactory according to the present invention, shows that Digital Television judges the flow process of digital signal method.
Fig. 4 is the example more satisfactory according to the present invention, shows the drawing of digital signal determination methods.
* accompanying drawing major part symbol description *
100:IR (infrared ray) acceptance division 110: control part
120: tuner 130: decoder
140: video processor (Video Processor) 150: transport part
160: reservoir 200: signal receiving part
210: digital signal induction part 220: register
Embodiment
Below, the drawing with reference to additional specifies more satisfactory example of the present invention.
Fig. 1 is the example more satisfactory according to the present invention, roughly represents the integration map of Digital Television structure, and Fig. 2 is the example more satisfactory according to the present invention, specifies and judges the integration map that whether has the decoder of digital signal in the channel.
According to Fig. 1, Digital Television comprises IR acceptance division 100, control part 110, tuner 120, decoder 130, video processor 140, transport part 150, reservoir 160.
Above-mentioned IR acceptance division 100 receives the code of remote control (code) that the user selects, and is sent to control part 110.
Above-mentioned control part 110 is analyzed the code of remote control that above-mentioned IR acceptance division 100 transmits, and the code of remote control analytical information is sent to relevant device.
Give one example, if above-mentioned code of remote control analytical information belongs to the order that channel is confirmed requirement, the affirmation that above-mentioned control part 110 will be relevant with above-mentioned channel requires order to be sent to decoder 130.
Above-mentioned reservoir 160 comprises the flash room (quickflashing room) that stores operation architecture and so on software and dynamic random access memory (DRAM) two parts with bitmap (bitmap) form virtual screen that storage is presented at CRT (cathode ray tube) field.
Above-mentioned tuner 120, is converted to intermediate frequency (IF) signal to the wireless signal that transmits, and is sent to decoder 130 by antenna according to the analytical information of the code of remote control of user's selection.
Above-mentioned decoder 130 is the IF conversion of signals that above-mentioned tuner 120 transmits TP (teleprocessing) data, and is sent to video processor 140.
In addition, during above-mentioned decoder 130 auto channel searches, judge whether input signal belongs to normal signal, judge that with this whether channel exists.That is to say, during above-mentioned decoder 130 auto channel searches, judge whether the IF signal that transmits from above-mentioned tuner 120 belongs to digital signal.
Above-mentioned judged result, if above-mentioned IF signal belongs to digital signal, above-mentioned decoder 130 just is judged as and has digital signal, and moves other decode procedure; But if do not belong to digital signal, no longer further confirm,, judge that whether digital signal exists next channel signals.
To above-mentioned decoder 130, will carry out more specific description with reference to figure 2.According to Fig. 2, decoder comprises signal receiving part 200, digital signal induction part 210, register 220.
Above-mentioned signal receiving part 200 receives the IF signal that transmits by above-mentioned tuner 120, and is sent to digital signal induction part 210.
To the IF signal that above-mentioned signal receiving part 200 transmits, above-mentioned digital signal induction part 210 judges whether to belong to digital signal.If above-mentioned judged result is that above-mentioned input signal belongs to digital signal, above-mentioned digital signal induction part 210 just is sent to register 220 to the digital signal induction information.
Here, above-mentioned digital signal induction part 210 judges that the method whether above-mentioned IF signal belong to digital signal is as follows:
To the input signal ad-hoc location that above-mentioned tuner 120 transmits, above-mentioned digital signal induction part 210 confirms to set in advance the PWL value of core point, judges whether the PWL value of above-mentioned affirmation belongs in the specific area.
Above-mentioned judged result, if above-mentioned PWL belongs in the specific area, above-mentioned digital signal induction part 210 is judged whether the PWL value deviation of above-mentioned each core point belongs to and is shifted to an earlier date within the setting range.If this judged result is the PWL value deviation of above-mentioned each core point to be belonged to and shift to an earlier date in the setting range, above-mentioned digital signal induction part 210 is sent to register 220 to the digital signal induction information.
Above-mentioned register 220 stores the digital signal induction information that above-mentioned digital signal induction part 210 transmits.Above-mentioned digital signal induction information comprises channel correlation number etc.
Therefore, the user confirms above-mentioned register 220, judges with this whether input signal belongs to digital VSB/QAM.
Above-mentioned video processor 140 is converted to picture signal with the TP data that above-mentioned decoder transmits, and is sent to transport part 150.
The view data that above-mentioned video processor 140 transmits is proofreaied and correct in above-mentioned transport part 150, and view data is suitably shown according to picture.
Below, according to Fig. 3 explanation, above-mentioned Digital Television is judged the method whether digital signal exists.
Fig. 3 is the example more satisfactory according to the present invention, and the expression Digital Television is judged the flow chart whether digital signal exists.
According to Fig. 3, after the Digital Television received signal (S300),, confirm to set in advance the PWL value (S302) of core point to the ad-hoc location of above-mentioned input signal.
Here, the ad-hoc location of above-mentioned input signal is meant the 2nd intermediate frequency signal center of input signal, and the above-mentioned core point of setting in advance is meant with above-mentioned center to be the point of the left and right sides certain distance of standard.
After stages 302 operation, above-mentioned Digital Television judges whether each core point PWL value of above-mentioned affirmation belongs to specific area with interior (S304).Here, above-mentioned specific area is set to upper restriction field in advance from the next restriction PWL value.
The judged result in stage 304, if the PWL value of above-mentioned each core point belongs in the specific area, above-mentioned Digital Television just judges whether the signal of above-mentioned input belongs to digital signal, and moves other decode procedure (S308).
The judged result in stage 304, if the PWL value of above-mentioned each core point does not belong to specific area, above-mentioned Digital Television no longer further confirms, receives (S310) behind the signal that next channel imports the operation phase 302.
As mentioned above, whether belong to the longest 200ms of being of required time of digital signal, use the time of 200ms therefore, can significantly reduce the required time of auto channel search by other channel the channel that exists except digital signal if judge input signal.
Fig. 4 is the example more satisfactory according to the present invention, the determination methods whether the expression digital signal exists.
According to Fig. 4, to input signal, Digital Television is a standard with the center 400 of the 2nd intermediate frequency signal, judges the PWL value of left and right sides certain distance point 410,420, judges with this whether the PWL value of above-mentioned judgement belongs between the next restriction PWL D and the upper restriction PWL C.
Above-mentioned judged result, if the PWL of a fixed point 410,420 belongs between the next restriction PWL D and upper restriction PWL C that sets in advance about above-mentioned, above-mentioned Digital Television just judges whether above-mentioned each core point PWL value difference distance belongs to the scope E that sets in advance.Above-mentioned judged result, if above-mentioned each core point PWL value difference is apart from belonging to the scope E that sets in advance, above-mentioned Digital Television judges that above-mentioned input signal is a digital signal.
The present invention is not limited to above-mentioned example, and under the prerequisite that does not break away from the technology of the present invention thought, it is possible thing that senior colleague carries out more change.
Claims (6)
1, during a kind of Digital Television auto channel search, judge the method whether digital signal exists, it comprises:
After each channel received signal, to the ad-hoc location of above-mentioned received signal, the stage of the PWL of core point is set in affirmation in advance;
Whether the PWL value of judging above-mentioned each core point belongs to critical range with the interior stage;
Above-mentioned judged result if the PWL value of above-mentioned each core point belongs in the critical range, just judges whether the PWL value deviation of above-mentioned each core point belongs to the deviation range of appointment in advance with the interior stage;
Above-mentioned judged result if the PWL value deviation of each core point belongs in the deviation range of setting in advance, just is judged as the stage that above-mentioned input signal is a digital signal.
2, the method that whether exists of judgement digital signal as claimed in claim 1 also comprises: the stage that stores the digital signal induction information of above-mentioned judgement.
3, the method that whether exists of judgement digital signal as claimed in claim 1 is characterized in that the ad-hoc location of above-mentioned received signal is the center of the 2nd intermediate frequency signal.
4, the method that whether exists of judgement digital signal as claimed in claim 1 is characterized in that, the center that the above-mentioned core point of setting in advance is the 2nd intermediate frequency signal is a standard, the point of left and right sides certain distance.
5, the method that whether exists of judgement digital signal as claimed in claim 1 is characterized in that, if the PWL value of above-mentioned each core point does not belong in the critical range, just receives the signal of next channel, judges whether to exist digital television signal.
6, the method that whether exists of judgement digital signal as claimed in claim 1 is characterized in that, if the PWL value deviation of each core point does not belong in the deviation range of setting in advance, just receives the signal of next channel, judges whether to exist digital television signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200410053169XA CN1728787A (en) | 2004-07-27 | 2004-07-27 | Method for determining whether there is digital signal in digital TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200410053169XA CN1728787A (en) | 2004-07-27 | 2004-07-27 | Method for determining whether there is digital signal in digital TV set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1728787A true CN1728787A (en) | 2006-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200410053169XA Pending CN1728787A (en) | 2004-07-27 | 2004-07-27 | Method for determining whether there is digital signal in digital TV set |
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| Country | Link |
|---|---|
| CN (1) | CN1728787A (en) |
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- 2004-07-27 CN CNA200410053169XA patent/CN1728787A/en active Pending
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