CN201234318Y - Television receiving system and vehicle-mounted television device - Google Patents
Television receiving system and vehicle-mounted television device Download PDFInfo
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- CN201234318Y CN201234318Y CNU2008200951929U CN200820095192U CN201234318Y CN 201234318 Y CN201234318 Y CN 201234318Y CN U2008200951929 U CNU2008200951929 U CN U2008200951929U CN 200820095192 U CN200820095192 U CN 200820095192U CN 201234318 Y CN201234318 Y CN 201234318Y
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Abstract
The utility model provides a television receiving system, belonging to the field of multimedia technology, which comprises a decoding unit. The television receiving system further comprises a plurality of antennae for receiving audio/video signals; a plurality of tuning/demodulating units which are one-to-one corresponding to the antennae for tuning/demodulating the received audio/video signals; and an integrating unit which is connected between the plurality of tuning/demodulating units and the decoding unit to integrate the signals from the plurality of tuning/demodulating units and output an optimal audio/video signal. The television receiving system can obtain the optimal signal with the maximum signal to noise ratio by continuously integrating two or more paths of signals, and can maximally optimize the signals in the case of being placed in a mobile terminal or an environment with unstable peripheral signals, resulting in an optimal receiving effect of the television signals and high practicability.
Description
Technical field
The utility model belongs to multimedia technology field, relates in particular to a kind of TV receiving system and in-car TV equipment.
Background technology
Be equipped with at present various multimedia terminal system on the automobile,, make the user can enjoy various amusements at any time and receive real time information as in-car TV receiving system, navigation system etc.TV is as obtaining the simplest of up-to-date information and method the most easily, even can satisfy the requirement that people also can obtain up-to-date information onboard at any time, therefore, a lot of automobile manufacturing companies the in-car TV receiving system a most important configuration be integrated in the automobile product.
The in-car TV system that prior art provides, as shown in Figure 1, adopt single antenna receive around the TV signal point of maximum intensity TV signal and send coupled tuning/demodulating unit to, after tuning/demodulating unit carries out tuning, demodulation to the TV signal that receives, send coupled adjunct circuit to, after adjunct circuit carried out error correction, leaches program channel number etc. and handle signal, after sending coupled decoding unit again to and decoding, the output television audio and video signals also showed.Because during automobile is in and constantly moves, the point of maximum intensity of the TV signal of motor vehicle environment also constantly changes, and the single antenna position is single fixing, can not capture the point of maximum intensity of the motor vehicle environment TV signal in moving, make the poor effect of the TV signal that receives in the in-car TV system most of the time, poor practicability.
The utility model content
The purpose of this utility model is to provide a kind of TV receiving system, is intended to solve the TV signal poor effect that has the in-car TV receiving system now and receive, the problem of poor practicability.
The utility model is achieved in that a kind of TV receiving system, comprises decoding unit, and described TV receiving system further comprises:
Many the antennas that receive audio-video signal;
Connect one to one with described antenna, the audio-video signal that described antenna is received carries out a plurality of tuning/demodulating unit tuning, demodulation process; And
Be connected in described a plurality of tuning/demodulating unit and described decoding unit between, to described a plurality of tuning/signal that demodulating unit is handled output integrates, and exports the integral unit of optimum audio-video signal.
Another purpose of the present utility model is to provide a kind of in-car TV equipment, comprises a TV receiving system, and described TV receiving system comprises decoding unit, and described TV receiving system further comprises:
Many the antennas that receive audio-video signal;
Connect one to one with described antenna, the audio-video signal that described antenna is received carries out a plurality of tuning/demodulating unit tuning, demodulation process; And
Be connected in described a plurality of tuning/demodulating unit and described decoding unit between, to described a plurality of tuning/signal that demodulating unit is handled output integrates, and exports the integral unit of optimum audio-video signal.
The utility model is by to the two-way that receives or the continuous integration of multiple signals, to obtain the Optimal Signals that has maximum signal to noise ratio and have maximum amplitude.When placing portable terminal or be in the unsettled environment of ambient signals, can optimize signal to greatest extent, make reception the best of TV signal, practical.
Description of drawings
Fig. 1 is the schematic diagram of the in-car TV receiving system that provides of prior art;
Fig. 2 is the structure principle chart of the TV receiving system that provides of the utility model first embodiment;
Fig. 3 is the structure chart of the TV receiving system that provides of the utility model second embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model embodiment obtains to have the Optimal Signals of maximum signal to noise ratio and maximum amplitude by to the two-way that receives or the continuous integration of multichannel high frequency audio vision signal, and this Optimal Signals is handled back output through error correction, filtration, decoding etc.
Fig. 2 shows the structural principle of the TV receiving system that the utility model first embodiment provides, and for convenience of description, only shows the part relevant with present embodiment.
For the TV receiving system in moving, the continuous variation of environment makes the strong and weak of ambient signals constantly change.With reference to Fig. 2, the utility model embodiment adopts n (n 〉=2) strip antenna to receive the high-frequency signal of different directions, and respectively by first tuning/demodulating unit 21, second tuning/demodulating unit 22...... n tuning/demodulating unit 2n sends the first classification integron unit 251, the second classification integron unit 252...... n classification integron unit 25n in the integral unit 25 to.
For arbitrary classification integron unit, the two paths of signals that receives is integrated, and the signal of output after integration processing.Constantly integrate through n-1 time, n classification integron unit 25n obtains to have the Optimal Signals of maximum signal to noise ratio and maximum amplitude, and sends decoding unit 27 to.After decoding unit 27 is decoded to the received signal, the output audio-video signal.When specific implementation, can also between n classification integron unit 25n and decoding unit 27, add an adjunct circuit 26.The Optimal Signals of 26 pairs of n classification integrons of adjunct circuit unit 25n output carries out error correction, leach program channel number etc. handle after, export decoding unit 27 to.
In the utility model embodiment, the user can be provided with the quantity of tuning/demodulating unit and its corresponding classification integron unit flexibly according to the environment needs.When most of times of TV receiving system were in the stronger operational environment of TV signal, the quantity of tuning/demodulating unit and its corresponding classification integron unit can be selected few, to save cost, dwindled small product size, guaranteed that product is attractive in appearance; When most of times of TV receiving system were in the more weak operational environment of TV signal, tuning/demodulating unit and its corresponding classification integron unit can be selected more, to strengthen the effect to the demodulating and decoding of the TV signal that receives.Usually, select 2 tuning/demodulating units and its corresponding classification integron unit at least, certainly, in order to obtain better Optimal Signals, can not limit increase a plurality of tuning/demodulating unit and its corresponding classification integron unit.
In the utility model embodiment, the signal input part of tuning/demodulating unit is connected with antenna, be used for the high-frequency signal that antenna receives is detuned into intermediate-freuqncy signal, and the intermediate-freuqncy signal after will detuning is carried out demodulation.Signal after demodulation exports the internal signal input of classification integron unit to by the signal output part of tuning/demodulating unit.Among the utility model embodiment, each classification integron unit according to circumstances, can comprise in internal signal input, external signal input, internal signal output and the external signal output one or more, during concrete the application, for integrated standardization, integral unit can all comprise internal signal input, external signal input, internal signal output and external signal output.Each classification integron unit adopts the diversity folding, the input signal of inner signal input part and the input signal of external signal input is integrated, to obtain optimum signal such as signal to noise ratio, amplitude.Wherein, the diversity folding can be high specific merging, equal gain combining or selectivity merging etc.
Describe the operation principle of TV receiving system shown in Fig. 2 below in detail:
The signal input part that the signal input part of first tuning/demodulating unit 21 connects antenna 1, the second tuning/demodulating unit 22 connects antenna 2 ... n is tuning/and the signal input part of demodulating unit 2n connects antenna n.The signal output part of first tuning/demodulating unit 21 links to each other with the internal signal input of the first classification integron unit 251, and the signal output part of second tuning/demodulating unit 22 links to each other with the internal signal input of the second classification integron unit 252 ... and n is tuning/and the signal output part of demodulating unit 2n links to each other with the internal signal input of n classification integron unit 25n.In integral unit 25 inside, the external signal output of a last classification integron unit is connected to the external signal input of next classification integron unit, wherein the internal signal output of n classification integron unit 25n connects the input of decoding unit 27, certainly when specific implementation, also can according to circumstances be connected to the signal input part of adjunct circuit 26.For the ease of integration standardization, in the utility model embodiment, integral unit 25 comprises with each tuning/demodulating unit of n distinguishes n classification integron unit one to one, when concrete the application, can as required the first classification integron unit 251 be removed, and the signal output part of first tuning/demodulating unit 21 directly is connected with the external signal input of the second classification integron unit 252.
Adopting high specific merging mode to integrate input signal with n classification integron unit is example, merges principle, the amplitude of combined signal according to diversity
, a wherein
iBe i (weight coefficient of road input signal of 1≤i≤n), r
iBe the amplitude of i road input signal, the general density of noise power of establishing every road input signal is N
0/ 2, merge principle according to diversity, the general density of noise power that merges the back output signal is
。Can get the signal to noise ratio of output signal by the signal to noise ratio formula
Can prove by Cauchy inequality for following formula, work as a
i 2=r
i 2/ N
0The time, the γ maximum, at this moment,
, promptly total signal to noise ratio of combined signal be each branch road signal to noise ratio and.
For first tuning/demodulating unit 21 and the first classification integron unit, the 251 and second tuning/demodulating units 22 and the second classification integron unit 252, the internal signal input of the second classification integron unit 252 receives the signal after second tuning/demodulating unit 22 demodulation, the external signal input of the second classification integron unit 252 receives the external output signal of the first classification integron unit 251, by above derivation as can be known, after the above-mentioned two paths of signals that second 252 pairs of the classification integron unit receive is integrated, by the signal to noise ratio of the signal of the external signal output output of the second classification integron unit 252 be: γ
1.2=γ
1+ γ
2, the signal to noise ratio of the signal after promptly integrating through the second classification integron unit 252 is greater than the signal to noise ratio through signal after first tuning/demodulating unit 21 demodulation and the signal after second tuning/demodulating unit 22 demodulation.In addition, by the signal to noise ratio formula as can be known, the signal to noise ratio of one road signal is proportional to the squared magnitude of this road signal, therefore, the amplitude of the signal after integrating through the second classification integron unit 252 is greater than the amplitude through signal after first tuning/demodulating unit 21 demodulation and the signal after second tuning/demodulating unit 22 demodulation.
If n 〉=4, then (3≤k≤n-1) tuning/demodulating unit and k classification integron unit, k classification integron unit receives the output signal of the external output port of k-1 classification integron unit for middle k.K classification integron unit receive simultaneously k tuning/output signal of demodulating unit, by above derivation as can be known, after the above-mentioned two paths of signals that receives integrated, be by the signal of the external signal output port output of k classification integron unit:
, the signal to noise ratio of the signal after promptly integrating through k classification integron unit greater than the signal after integrating through k-1 classification integron unit and through k tuning/signal to noise ratio of signal after the demodulating unit demodulation.In addition, by the signal to noise ratio formula as can be known, the signal to noise ratio of one road signal is proportional to the squared magnitude of this road signal, therefore, the amplitude of the signal after integrating through k classification integron unit greater than the signal after integrating through k-1 classification integron unit and through k tuning/amplitude of signal after the demodulating unit demodulation.
For n tuning/demodulating unit 2n and n classification integron unit 25n, the internal signal input of n classification integron unit 25n receive n tuning/signal after the demodulating unit 2n demodulation, the external signal input of n classification integron unit 25n receives the external output signal of n-1 classification integron unit simultaneously, by above derivation as can be known, after n classification integron unit 25n integrated the above-mentioned two paths of signals that receives, the signal of being exported by the external signal output of n classification integron unit 25n was:
The signal to noise ratio of the signal after promptly integrating through n classification integron unit 25n greater than the signal after integrating through n-1 classification integron unit and through n tuning/signal to noise ratio of signal after the demodulating unit 2n demodulation.In addition, by the signal to noise ratio formula as can be known, the signal to noise ratio of one road signal is proportional to the squared magnitude of this road signal, therefore, the amplitude of the signal after integrating through n classification integron unit 25n greater than the signal after integrating through n-1 classification integron unit and through n tuning/amplitude of signal after the demodulating unit 2n demodulation.
Fig. 3 shows the structure of the TV receiving system that the utility model embodiment second embodiment provides, and for convenience of description, only shows the part relevant with present embodiment.
The utility model embodiment adopts n (n 〉=2) strip antenna to receive the high-frequency signal of different directions, and send to respectively first tuning/demodulating unit 21 until n tuning/demodulating unit 2n.N is tuning/after demodulating unit carries out tuning, demodulation process to the high-frequency signal that receives respectively, export to centralized integration unit 31 in the integral unit 25.Centralized integration unit 31 adopts the diversity folding, centralized integration is carried out in signal unification after n tuning/demodulating unit processing, obtaining a signal to noise ratio, and send decoding unit 27 to greater than the signal to noise ratio of arbitrary input signal, amplitude Optimal Signals greater than arbitrary input signal amplitude.Wherein, the diversity folding can be high specific merging, equal gain combining or selectivity merging etc., and it is described that it integrates a same embodiment of principle, do not repeat them here.
Described each diversity of first embodiment of the invention merges subelement and the described centralized integration of second embodiment of the invention unit all can adopt existing diversity combiner to realize.
The utility model embodiment also provides a kind of in-car TV equipment, and this in-car TV equipment comprises the TV receiving system that the arbitrary embodiment of the utility model provides.
The utility model embodiment adopts the high-frequency signal on two or more antennas reception different directions, and the high-frequency signal that receives detuned and processing such as demodulation, by to the two-way after handling or the continuous integration of multiple signals, to obtain the Optimal Signals that has maximum signal to noise ratio and have maximum amplitude.When placing portable terminal or be in the unsettled environment of ambient signals, can optimize signal to greatest extent, make reception the best of TV signal, practical.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1, a kind of TV receiving system comprises decoding unit, it is characterized in that, described TV receiving system further comprises:
Many the antennas that receive audio-video signal;
Connect one to one with described antenna, the audio-video signal that described antenna is received carries out a plurality of tuning/demodulating unit tuning, demodulation process; And
Be connected in described a plurality of tuning/demodulating unit and described decoding unit between, to described a plurality of tuning/signal that demodulating unit is handled output integrates, and exports the integral unit of optimum audio-video signal.
2, TV receiving system as claimed in claim 1 is characterized in that, described integral unit comprises:
At least one the classification integron unit that connects one to one with other tuning/demodulating units except that first tuning/demodulating unit, wherein:
The internal signal input of first classification integron unit connects the signal output part of corresponding detuning/demodulating unit, and its external signal output connects the external signal input of next stage classification integron unit;
The internal signal input of last classification integron unit connects the signal output part of corresponding detuning/demodulating unit, its external signal input connects the external signal output of upper level classification integron unit, the Optimal Signals after its internal signal output output is integrated;
The internal signal input that removes the described first order and other classification integron unit of afterbody classification integron unit is connected the signal output part of corresponding detuning/demodulating unit, its external signal input connects the external signal output of upper level classification integron unit, and its external signal output connects the external signal input of next stage classification integron unit.
3, TV receiving system as claimed in claim 1 or 2 is characterized in that, described TV receiving system further comprises:
Be connected in the adjunct circuit that carries out error correction, filtration treatment between described integral unit and the described decoding unit, to the audio-video signal after the described integral unit processing.
4, TV receiving system as claimed in claim 1 or 2, it is characterized in that, described integral unit comprises a centralized integration unit that the signal unification after described a plurality of detuning/demodulating unit processing is carried out centralized integration, and described centralized integration unit links to each other with described a plurality of detuning/demodulating unit.
5, a kind of in-car TV equipment comprises a TV receiving system, and described TV receiving system comprises decoding unit, it is characterized in that, described TV receiving system further comprises:
Many the antennas that receive audio-video signal;
Connect one to one with described antenna, the audio-video signal that described antenna is received carries out a plurality of tuning/demodulating unit tuning, demodulation process; And
Be connected in described a plurality of tuning/demodulating unit and described decoding unit between, to described a plurality of tuning/signal that demodulating unit is handled output integrates, and exports the integral unit of optimum audio-video signal.
6, in-car TV equipment as claimed in claim 5 is characterized in that, described integral unit comprises:
At least one the classification integron unit that connects one to one with other tuning/demodulating units except that first tuning/demodulating unit, wherein:
The internal signal input of first classification integron unit connects the signal output part of corresponding detuning/demodulating unit, and its external signal output connects the external signal input of next stage classification integron unit;
The internal signal input of last classification integron unit connects the signal output part of corresponding detuning/demodulating unit, its external signal input connects the external signal output of upper level classification integron unit, the Optimal Signals after its internal signal output output is integrated;
The internal signal input that removes the described first order and other classification integron unit of afterbody classification integron unit is connected the signal output part of corresponding detuning/demodulating unit, its external signal input connects the external signal output of upper level classification integron unit, and its external signal output connects the external signal input of next stage classification integron unit.
7, as claim 5 or 6 described in-car TV equipment, it is characterized in that described TV receiving system further comprises:
Be connected in the adjunct circuit that carries out error correction, filtration treatment between described integral unit and the described decoding unit, to the audio-video signal after the described integral unit processing.
8, as claim 5 or 6 described in-car TV equipment, it is characterized in that, described integral unit comprises a centralized integration unit that the signal after described a plurality of detuning/demodulating unit processing is carried out centralized integration, and described centralized integration unit links to each other with described a plurality of detuning/demodulating unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200951929U CN201234318Y (en) | 2008-07-07 | 2008-07-07 | Television receiving system and vehicle-mounted television device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200951929U CN201234318Y (en) | 2008-07-07 | 2008-07-07 | Television receiving system and vehicle-mounted television device |
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| CN201234318Y true CN201234318Y (en) | 2009-05-06 |
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| CN102951088A (en) * | 2011-08-31 | 2013-03-06 | 深圳光启高等理工研究院 | Antenna internally arranging structure and mobile multimedia broadcasting device |
| CN103037641B (en) * | 2011-08-31 | 2017-02-01 | 深圳光启高等理工研究院 | Casing fixing structure and movable multimedia broadcasting device |
| CN104614606A (en) * | 2015-01-23 | 2015-05-13 | 青岛海信电器股份有限公司 | Method and device for detecting electromagnetic interference equipment |
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