CN105099590A - Viewing switching method for wireless broadcast signal and wireless network signal - Google Patents
Viewing switching method for wireless broadcast signal and wireless network signal Download PDFInfo
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Abstract
The objective of the invention is to provide a viewing switching method for a wireless broadcast signal and a wireless network signal so that a user is enabled to continuously view high-definition video information and wireless network use fees can be reduced. First searching processing is performed after network high-definition videos of a certain television station are searched and when the channel wireless broadcast signal of the television station in receiving is better; and second searching processing is performed under the condition that the network high-definition videos of the television station are viewed. Therefore, possibility that the wireless high-definition videos of the same television station cannot be continuously viewed due to poor wireless broadcast signals in the vehicle movement process can be reduced, and fees generated by viewing the network high-definition videos of the television station by using a wireless network can also be reduced.
Description
Technical field
The present invention relates to the rating changing method of a kind of radio broadcasting signal and wireless network signal, the radio broadcasting signal particularly in a kind of vehicle travel process and the rating changing method of wireless network signal.
Background technology
Past, in vehicle travel process, in-car TV TV receiving system utilizes radio broadcasting signal to carry out watch broadcast HD video information, when the radio broadcasting signal received can not ensure the broadcast HD video information of a certain channel of a certain TV station of rating continuously, while other channels of search this TV station same, automatically switch to the broadcast SD video information that the picture quality of this TV station of rating is lower.But this can bring the impact on appreciation effect to user.
Again, in the area that radio broadcasting signal is very weak, owing to being difficult to correctly to receive radio broadcasting signal, user can be caused to carry out continuous print rating.The rating changing method of a kind of radio broadcasting signal and wireless network signal is proposed in referenced patent document 1.When the signal strength signal intensity of the radio broadcasting signal received is not enough to ensure continuous print rating, stops receiving this radio broadcasting signal and starting connecting wireless network, utilize wireless network to carry out the identical network HD video information of rating content.But, connecting wireless network is also found corresponding network HD video information and can be spent the regular hour on network, user cannot carry out rating in the meantime, and if always utilize wireless network, a suitable expense can be produced according to institute's usage data flow.
Existing patent documentation
Patent documentation 1: Japanese Patent Laid-Open 2009-74881 publication
Summary of the invention
The object of the invention is to, provide a kind of user of enabling continuously rating HD video information and reduce the radio broadcasting signal of wireless network cost of use and the rating changing method of wireless network signal.
To achieve these goals, the rating changing method of radio broadcasting signal involved in the present invention and wireless network signal receives and/or searches for described radio broadcasting signal by the wireless broadcast receiving device with n (n >=2 and be natural number) individual high-frequency reception path, and receive described wireless network signal by 1 wireless network communication apparatus, wherein, high-frequency reception path comprises the tuner that an antenna and follow described antenna, and characteristic of antenna is identical described in each, described in each, the characteristic of tuner is identical, receiving and/or searching in the process of described radio broadcasting signal, described wireless broadcast receiving device can be allowed to include the receiving element of a part of described high-frequency reception path formation to receive the described radio broadcasting signal of a certain channel A of a certain TV station, simultaneously, the search unit including high-frequency reception path formation described in another part is allowed to search for, wherein, described search refers to the described radio broadcasting signal of all channels of the described TV station be received in one by one on whole television broadcast band,
The rating changing method of radio broadcasting signal involved in the present invention and wireless network signal comprises the following steps: step (1-1), utilizes the receiving element R be made up of whole n described high-frequency reception path
nreceive the described radio broadcasting signal of the described channel A of described TV station, and play the broadcast HD video information of described TV station, now, the described channel A of described TV station is as current receiving channels; Step (1-2), monitors the signal strength signal intensity of the described radio broadcasting signal of described current receiving channels; Step (1-3), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is more than or equal to described threshold value t
n-1time, return step (1-2), otherwise, enter step (1-4); Step (1-4), utilize described wireless network communication apparatus to find on network and whether there is network HD video information, described network HD video information is identical with the content of the described broadcast HD video information of described TV station, when searching out described network HD video information, enter step (1-5), otherwise, enter step (1-12); Step (1-5), starts to receive the described wireless network signal corresponding to described network HD video information; Step (1-6), if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is less than threshold value t
n, then keep receiving the described radio broadcasting signal of described current receiving channels but the described broadcast HD video information of the described TV station of stopping broadcasting, switch to and play described network HD video information and enter step (1-7), wherein, described threshold value t
n-1be greater than described threshold value t
n, otherwise, stop receiving described wireless network signal and carrying out the first search process; Step (1-7), carries out the second search process; Step (1-8), utilizes described receiving element R
nthe described radio broadcasting signal obtaining a certain channel B of described TV station by described second search process is received, now, the described channel B of described TV station, as described current receiving channels, monitors the signal strength signal intensity of the described radio broadcasting signal of described current receiving channels; Step (1-9), if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored in step (1-8) is more than or equal to described threshold value t
nso stop receiving described wireless network signal and stop playing described network HD video information, switch to the described broadcast HD video information playing described TV station, and carry out described first search process, if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored in step (1-8) is less than described threshold value t
n, then step (1-10) is entered; Step (1-10), if wireless network cost of use exceedes preset value, so enters step (1-11), otherwise returns step (1-7); Step (1-11), if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored in step (1-8) is more than or equal to threshold value t
n+1, then stop receiving described wireless network signal and stop playing described network HD video information, entering step (1-12), wherein said threshold value t
nbe greater than described threshold value t
n+1, otherwise, return step (1-7); Step (1-12), start the broadcast SD video information playing described TV station, the content of the broadcast SD video information of described TV station is identical with the content of the described broadcast HD video information of described TV station, but the definition of the broadcast SD video information of described TV station is less than the definition of the described broadcast HD video information of described TV station; Step (1-13), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is more than or equal to described threshold value t
ntime, stop the described broadcast SD video information playing described TV station, switch to the described broadcast HD video information of the described TV station of broadcasting and carry out described first search process, when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is less than described threshold value t
ntime, then enter step (1-14); Step (1-14), if want to start to play described network HD video information, then returns step (1-4), otherwise, return step (1-13).
Further, described first search process comprises: step (2-1), obtains the signal strength signal intensity of the described radio broadcasting signal of described current receiving channels, step (2-2), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is more than or equal to threshold value t
1time, utilize the receiving element R be made up of 1 described high-frequency reception path
1receive the described radio broadcasting signal of described current receiving channels, utilize the search unit S be made up of n-1 described high-frequency reception path simultaneously
1carry out described search, at described search unit S
1described search process in, when with described search unit S
1corresponding described receiving element R
1the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, just stop described search, utilize the receiving element R be made up of 2 described high-frequency reception paths
2receive the described radio broadcasting signal of described current receiving channels, and utilize the receiving element S be made up of n-2 described high-frequency reception path
2re-start described search, otherwise, complete described search and enter step (2-4), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is more than or equal to threshold value t
2and be less than described threshold value t
1time, utilize described receiving element R
2receive the described radio broadcasting signal of described current receiving channels, utilize described search unit S simultaneously
2carry out described search, wherein, described threshold value t
1be greater than described threshold value t
2, at described search unit S
2described search process in, when with described search unit S
2corresponding described receiving element R
2the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, just stop described search, utilize the receiving element R be made up of 3 described high-frequency reception paths
3receive the described radio broadcasting signal of described current receiving channels, and utilize the receiving element S be made up of n-3 described high-frequency reception path
3re-start described search, otherwise, complete described search and enter step (2-4), the like, when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is more than or equal to threshold value t
k(1≤k≤n-1 and k is natural number) and be less than described threshold value t
k-1time, utilize described receiving element R
kreceive the described radio broadcasting signal of described current receiving channels, utilize described search unit S simultaneously
kcarry out described search, wherein, described threshold value t
k-1be greater than described threshold value t
k, at described search unit S
kdescribed search process in, when with described search unit S
kcorresponding described receiving element R
kthe signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, just stop described search, utilize the receiving element R be made up of k+1 described high-frequency reception path
k+1receive the described radio broadcasting signal of described current receiving channels, and utilize the search unit S be made up of n-k-1 described high-frequency reception path
k+1re-start described search, complete described search and enter step (2-4), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is less than described threshold value t
n-1time, enter step (2-3), step (2-3), utilizes described receiving element R
nthe signal of the described radio broadcasting signal of described current receiving channels, as described receiving element R
nthe signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, terminate described first search and process and enter step (1-4), otherwise, return step (2-1), step (2-4), if the described radio broadcasting signal of channel corresponding to the described broadcast HD video information that can search multiple and described TV station, so with described receiving element R
nreceive the described radio broadcasting signal that in the described radio broadcasting signal of channel corresponding to the described broadcast HD video information of the multiple and described TV station searched, signal strength signal intensity is maximum, and play the described broadcast HD video information of the described TV station corresponding with it, now, using the channel of described radio broadcasting signal maximum for the signal strength signal intensity searched as new described current receiving channels, return step (2-1), if the described radio broadcasting signal of a channel corresponding with the described broadcast HD video information of described TV station can only be searched, so use receiving element R
nreceive the described radio broadcasting signal of the channel searched, and play the described HD video information of the described TV station corresponding with it, now, using the channel of described radio broadcasting signal that searches as new described current receiving channels, step (2-1) is returned.
Further, described threshold value t
k, described threshold value t
n, described threshold value t
n+1the signal strength values be determined in advance, described threshold value t
nbe set as follows: when the signal strength signal intensity of the described radio broadcasting signal received is less than described threshold value t
ntime, just can not play the described HD video information that the described radio broadcasting signal that receives is corresponding continuously, described threshold value t
n+1be set as follows: when the signal strength signal intensity of the described radio broadcasting signal received is less than described threshold value t
n+1time, just can not play the described SD video information that the described radio broadcasting signal that receives is corresponding continuously.
Further, step (4-1), utilizes described receiving element R
nreceive the described radio broadcasting signal of described current receiving channels; Step (4-2), if monitor by described receiving element R
nin any one described in the signal strength signal intensity of described radio broadcasting signal of described current receiving channels that receives of high-frequency reception path be all less than described threshold value t
n+1, so whole n described high-frequency reception path is formed search unit S respectively
h1with search unit S
h2, utilize described search unit S
h1the described television broadcast band of half carries out described search, utilizes described search unit S
h2second half described television broadcast band carries out described search, wherein, when n is even number, described search unit S
h1with described search unit S
h2the quantity of the described high-frequency reception path comprised is identical, when n is odd number, and described search unit S
h1with described search unit S
h2the quantity of the described high-frequency reception path comprised only differs one; As search unit S
h1and S
h2when can not search the described radio broadcasting signal corresponding with the described broadcast HD video information of described TV station, two described search units are merged into 1 search unit S
n, utilize described search unit S
nstart search until search the described radio broadcasting signal corresponding with the described broadcast HD video information of described TV station, enter step (4-4); Step (4-3), if monitor by described receiving element R
nin any one described in the signal strength signal intensity of described radio broadcasting signal of described current receiving channels that receives of high-frequency reception path be more than or equal to described threshold value t
n+1, so utilize described receiving element R
1while receiving the described radio broadcasting signal of described current receiving channels, also utilize described search unit S
1carry out described search, after completing described search, enter step (4-4); Step (4-4), if the described radio broadcasting signal of channel corresponding to the described broadcast HD video information that can search multiple and described TV station, so with described receiving element R
nreceive the described radio broadcasting signal that in the described radio broadcasting signal of channel corresponding to the described broadcast HD video information of multiple and described TV station, signal strength signal intensity is maximum, using the channel corresponding to it as new described current receiving channels, terminate described second search process, enter step (1-8), if the described radio broadcasting signal of a channel corresponding with the described broadcast HD video information of described TV station can only be searched, so with described receiving element R
nreceive the described radio broadcasting signal of the channel searched, using the channel corresponding to it as new described current receiving channels, terminate described second search process, enter step (1-8).
Compared to prior art, the present invention can obtain following technique effect: be deteriorated to a certain extent at the radio broadcasting signal of a certain channel of certain TV station, but when this radio broadcasting signal can also be utilized to carry out continuous print rating to HD video information, just received the network HD video information of this TV station by wireless network, thus ensure that user can carry out continuous print rating.Simultaneously, by n high-frequency reception path is divided into receiving element and search unit, while receive this radio broadcasting signal with receiving element while search for all channels of same TV station with search unit, when can ensure when there being the radio broadcasting signal of arbitrary above-mentioned channel to carry out continuous print rating to broadcast HD video information, just then utilize the radio broadcasting signal of this channel to carry out watch broadcast HD video information, thus reduce the cost of use of wireless network.
Accompanying drawing explanation
Fig. 1 is the structural representation of the in-car TV TV receiving system of the embodiment that the rating changing method using radio broadcasting signal involved in the present invention and wireless network signal is shown.
Fig. 2 is the threshold value schematic diagram that the signal strength signal intensity according to radio broadcasting signal of an embodiment of rating changing method based on radio broadcasting signal involved in the present invention and wireless network signal sets.
Fig. 3 is the flow chart of an embodiment of the rating changing method that radio broadcasting signal involved in the present invention and wireless network signal are shown.
Fig. 4 is the flow chart that first in the rating changing method of radio broadcasting signal involved in the present invention and wireless network signal searches for the embodiment processed.
Fig. 5 is the flow chart that second in the rating changing method of radio broadcasting signal involved in the present invention and wireless network signal searches for the embodiment processed.
Embodiment
Below, by reference to the accompanying drawings and embodiment to involved in the present invention to radio broadcasting signal and the rating changing method of wireless network signal be described in detail.But technical scope of the present invention is not limited to these execution modes, and relate to invention described in claims and equivalent thereof.In addition, in the description of the drawings, prosign is accompanied by same or considerable part, and the repetitive description thereof will be omitted.
Fig. 1 is the structural representation of the in-car TV TV receiving system of the embodiment that the rating changing method using radio broadcasting signal involved in the present invention and wireless network signal is shown.User can utilize in-car TV watching device 1 in vehicle moving process, receive radio broadcasting signal and/or wireless network signal and watch corresponding video information (that is, broadcasting HD video information, network HD video information, broadcast SD video information).In addition, " high definition " and " SD " described in the present invention is not to the definition of video information is defined as a certain or some specific definition, and being interpreted as the video information of " SD ", the video information of " high definition " has higher definition.Again, in the present embodiment, under being set in a channel, utilizing the different frequency in this channel to bring and broadcast the broadcast HD video information of same content simultaneously and broadcast SD video information.In addition, in the present embodiment, the signal strength signal intensity also setting the network wireless signal that in-car TV watching device 1 is received substantially not be provided with in-car TV watching device 1 vehicle movement and there is excessive change, namely move period in-car TV watching device at vehicle and 1 can receive wireless network signal all the time and play corresponding network HD video information continuously.In addition, the finger that is meant to of " rating " is above received the radio broadcasting signal of a certain channel and plays the broadcast HD video information corresponding with the radio broadcasting signal of this channel or broadcast SD video information, or receives certain wireless network signal and play the network HD video information corresponding with this wireless network signal.
In the present embodiment, in-car TV TV receiving system 1 comprises wireless broadcast receiving device 2, radio communication device 3, control device 4, display unit 5, operating means 6 and storage device 7.Wireless broadcast receiving device 2 for receiving and/or search radio broadcasting signal, comprise high-frequency reception path 21,22,23,24, demodulation integral unit 25, first decoding unit 26 and the second decoding unit 27.
As shown in Figure 1,1 high-frequency reception path comprises the tuner that 1 antenna and follow this antenna, and the characteristic of antenna 211,221,231,241 is identical, and the characteristic of tuner 212,222,232,242 is identical.High-frequency reception path 21,22,23,24 receives the radio broadcasting signal of a certain channel respectively and this radio broadcasting signal is sent to decoding integral unit 25.Further, control device 4 is connected with tuner 212,222,232,242 respectively, and thus control high-frequency reception path 21,22,23,24, make it receive the broadcast wireless signal of the channel of being specified by control device 4.
Receiving and/or searching in the process of radio broadcasting signal, wireless broadcast receiving device 2 can be allowed to include the receiving element of a part of high-frequency reception path formation to receive the radio broadcasting signal of a certain channel of a certain TV station, simultaneously, the search unit including another part high-frequency reception path formation is allowed to search for, wherein, search mentioned here refers to the radio broadcasting signal of all channels being received in this TV station on television broadcast band with search unit one by one.The channel searched for is instruction according to control device and is designated.
Demodulation integral unit 25 carries out demodulation respectively to the radio broadcasting signal coming from each high-frequency reception path, obtains corresponding demodulated signal.And, control device 4 makes demodulation integral unit 25 according to certain Integration Mode, each demodulated signal of the high-frequency reception path coming from receiving element is integrated into demodulated received signal, and each demodulated signal of the high-frequency reception path coming from search unit is integrated into demodulation search signal.As an example of Integration Mode, such as, maximum-ratio combing can be adopted.In addition, as hereinafter described in detail, if any high-frequency reception path is not formed receiving element, and all high-frequency reception paths divided equally (quantity of high-frequency reception path is even number) or approximate divide equally (quantity of high-frequency reception path is odd number) and form two search units: the first search unit and the second search unit, so by come from the first search unit each demodulated signal of high-frequency reception path be integrated into demodulation first search signal, and by come from the second search unit each demodulated signal of high-frequency reception path be integrated into demodulation second search signal.Wherein, refer to that the quantity of the high-frequency reception path comprised in number ratio second search unit of the high-frequency reception path comprised in the first search unit is many or lack one approximate dividing equally.
Demodulation integral unit 25 is from demodulated received signal and demodulation search signal, or extract corresponding TS (TransportStream) signal from demodulation first search signal with out demodulation second search signal, and corresponding TS signal is sent to respectively the first decoding unit 26 and the second decoding unit 27.Demodulation integral unit 25 is also by the information relevant with the signal strength signal intensity of demodulation search signal with the signal strength signal intensity of demodulated received signal, or the information (such as MER (ModulationErrorRate)) relevant to the signal strength signal intensity of the signal strength signal intensity of demodulation first search signal and demodulation second search signal is sent to control device 4, obtains the signal strength signal intensity of radio broadcasting signal for control device 4.
First decoding unit 26 is identical with the characteristic of the second decoding unit 27, may be used to carry out identical decoding process to the TS signal from demodulation integral unit 25, thus obtain corresponding video information (broadcast HD video information, broadcast SD video information) and be sent to control device 4.The information (station symbol of such as TV station) of this video information from which TV station can be judged, so the channel receiving or search which TV station corresponding can be known in conjunction with control device because include in the video information obtained by the first decoding unit 26 and/or the second decoding unit 27.
Radio communication device 3 adopts wireless communication technology to receive wireless network signal, and from the wireless network signal received, obtain corresponding network HD video information, and this network video information is sent to control device 4.Meanwhile, according to the instruction of control device 4, radio communication device is also used to the wireless network high definition video information finding particular station.Such as, as an example of above-mentioned wireless communication technology, G mobile communication (3G).
Control device 4 is the equipment for carrying out information processing.As shown in Figure 1, control device 4 and tuner 212,222,232,242, demodulation integral unit 25, first decoding unit 26, second decoding unit 27, radio communication device 2, display unit 5, operating means 6, storage device 7 be connected respectively.
Display unit 5 is for showing the video information from certain TV station coming from control device 4.According to the rating changing method of radio broadcasting signal described later and wireless network signal, control device 4 by select by the first decoding unit 26 or the second decoding unit 27 decode certain TV station obtained a certain channel broadcast HD video information, broadcast SD video information, and a video information in the network HD video information of this TV station obtained by radio communication device 3 is as the video information being sent to control device 4 and carrying out showing.
Operating means 6 for carrying out information input to control device 4, such as, can be keyboard.Also can become one as an input-output apparatus with display unit 5, such as, can be touch-screen.
The program that storage device 7 uses for control device 4, data.
Fig. 2 is the threshold value schematic diagram that the signal strength signal intensity according to radio broadcasting signal of an embodiment of rating changing method based on radio broadcasting signal involved in the present invention and wireless network signal sets.The longitudinal axis of Fig. 2 represents signal strength signal intensity, horizontal axis representing time, and the curve in Fig. 2 schematically shows the time dependent signal strength signal intensity of a certain signal, has nothing to do with the variation tendency of the signal strength signal intensity of reality.In the present embodiment, because the maximum number that can form the high-frequency reception path of a receiving element is four, so the threshold value that setting five is relevant to the signal strength signal intensity of the radio broadcasting signal utilizing receiving element to receive: threshold value t
1, threshold value t
2, threshold value t
3, threshold value t
4with threshold value t
5.Further, these five threshold values are all numerical value that be determined in advance, that represent signal strength signal intensity, and meet threshold value t
1> threshold value t
2> threshold value t
3> threshold value t
4> threshold value t
5.
When the signal strength signal intensity using whole four high-frequency reception paths 21,22,23,24 to form the radio broadcasting signal of a certain channel of certain TV station that a receiving element receives is more than or equal to threshold value t
1time, mean that the receiving element be made up of any one high-frequency reception path can ensure the broadcast HD video information that rating is corresponding to this channel continuously.Therefore, this timed unit 4 will control high-frequency reception path 21,22,23,24, make wherein any one high-frequency reception path form a receiving element to receive the radio broadcasting signal of this channel, and make its excess-three high-frequency reception path form a search unit to search for all channels of this TV station.
When the signal strength signal intensity using whole four high-frequency reception paths 21,22,23,24 to form the radio broadcasting signal of a certain channel of certain TV station that a receiving element receives is more than or equal to threshold value t
2and be less than threshold value t
1time, mean that the receiving element be made up of any two high-frequency reception paths can ensure the broadcast HD video information that rating is corresponding to this channel continuously.Therefore, this timed unit 4 will control high-frequency reception path 21,22,23,24, make wherein any two high-frequency reception paths form a receiving element to receive the radio broadcasting signal of this channel, and make all the other two high-frequency reception paths form a search unit to search for all channels of this TV station.
When the signal strength signal intensity using whole four high-frequency reception paths 21,22,23,24 to form the radio broadcasting signal of a certain channel of certain TV station that a receiving element receives is more than or equal to threshold value t
3and be less than threshold value t
2time, mean that the receiving element be made up of any three high-frequency reception paths can ensure the broadcast HD video information that rating is corresponding to this channel continuously.Therefore, this timed unit 4 will control high-frequency reception path 21,22,23,24, make wherein any three high-frequency reception paths form a receiving element to receive the radio broadcasting signal of this channel, and make all the other high-frequency reception paths form a search unit to search for all channels of this TV station.
When the signal strength signal intensity using whole four high-frequency reception paths 21,22,23,24 to form the radio broadcasting signal of a certain channel of certain TV station that a receiving element receives is more than or equal to threshold value t
4and be less than threshold value t
3time, mean and the receiving element be made up of whole four high-frequency reception paths must be used to ensure to carry out continuous print rating to the broadcast HD video information corresponding to this channel, in other words, if the signal strength signal intensity of the radio broadcasting signal of this channel continues to be deteriorated (be less than threshold value t
4), even if use the receiving element be made up of whole four high-frequency reception paths also possibly cannot ensure to carry out continuous print rating to the broadcast HD video information corresponding to this channel.Therefore, this timed unit 4 will control high-frequency reception path 21,22,23,24, make whole four high-frequency reception paths form a receiving element to receive the radio broadcasting signal of this channel.And, in order to also cannot seeing the network HD video information identical with the content of this broadcast HD video information during the broadcast HD video information of this channel of rating continuously at once, control device 4 also utilizes wireless network communication apparatus 3, the networks such as such as the Internet find the network HD video information that whether there is this TV station, and when finding this network HD video information, utilize wireless network communication apparatus 3 to receive the corresponding wireless network signal of this network HD video information and (but do not play this network HD video information, still above-mentioned broadcast HD video information is play).
When the signal strength signal intensity using whole four high-frequency reception paths 21,22,23,24 to form the radio broadcasting signal of a certain channel of certain TV station that a receiving element receives is more than or equal to threshold value t
5and be less than threshold value t
4time, use the receiving element be made up of whole four high-frequency reception paths also possibly cannot ensure to carry out continuous print rating to the broadcast HD video information corresponding with the radio broadcasting signal of this channel even if mean.Therefore, stop playing this broadcast HD video information (but still receiving the radio broadcasting signal of this channel), then play the network HD video information of this TV station.And, because rating network HD video can produce wireless network cost of use, so (such as can judge according to under type: the of that month network traffic data used exceedes the data traffic of regulation when wireless network cost of use exceedes preset value, or the Web vector graphic time in this month exceeds schedule time), stop receiving wireless network signal and then the broadcast SD video information of this channel of broadcasting.
When the signal strength signal intensity using whole four high-frequency reception paths 21,22,23,24 to form the radio broadcasting signal of a certain channel of certain TV station that a receiving element receives is less than threshold value t
5time, use the receiving element be made up of whole four high-frequency reception paths also possibly cannot ensure to carry out continuous print rating to the broadcast SD video information corresponding with the radio broadcasting signal of this channel even if mean.That is, at this moment, if want the video information continuing this TV station of rating, wireless network communication apparatus 3 can only be utilized to carry out the high-definition network video information of this TV station of rating.
Fig. 3 is the flow chart of an embodiment of the rating changing method that radio broadcasting signal involved in the present invention and wireless network signal are shown.In the present embodiment, at the beginning, user selects to want the TV station carrying out rating by operating means 6, and thus, in-car TV receiving system 1 utilizes the receiving element R be made up of whole four high-frequency reception paths 21,22,23,24
4receive the radio broadcasting signal of a certain channel A of this TV station and play the broadcast HD video information (step S301) corresponding with the radio broadcasting signal of channel A.The corresponding relation of this channel A and this TV station is known, and this corresponding relation is previously stored in storage device 7.Now, the channel A of this TV station is as current receiving channels.
While the radio broadcasting signal receiving current receiving channels, the radio broadcasting signal of the current receiving channels received is monitored (step S302).Here, monitoring refers to every specific time interval, obtains the signal strength signal intensity of the radio broadcasting signal as monitoring target.Specific time interval can be such as 1 second.
Along with the movement of vehicle being provided with in-car TV receiving system 1, the signal strength signal intensity of the radio broadcasting signal of current receiving channels also can change.As step S303, when the signal strength signal intensity of the radio broadcasting signal of the current receiving channels monitored is more than or equal to described threshold value t
3time, return step S302, otherwise, enter step S304.
As step S304, the control device 4 in in-car TV receiving system 1 utilizes wireless network communication apparatus 3 to find on network whether to exist the network HD video information of this TV station.This network HD video information is identical with the content of the broadcast HD video information of this TV station.When searching out this network HD video information, start to receive the wireless network signal (step S305) corresponding to network HD video information, otherwise, enter step S315.In addition, in order to the broadcast HD video information of this network HD video information and this TV station can be synchronous, the synchronous process spending certain hour can be carried out in step S305.
Realize this network HD video information and this TV station broadcast HD video information synchronous after, whether threshold value t is less than to the signal strength signal intensity of the radio broadcasting signal of the current receiving channels monitored
4carry out judging (step S306).If above-mentioned judged result is yes, then keep receiving the radio broadcasting signal of current receiving channels but the broadcast HD video information of this TV station of stopping broadcasting, switch to and play this network HD video information (step S307) and enter step S309 (the second search process).Otherwise, stop receiving above-mentioned wireless network signal and enter step S308 (the first search process).About the first search process and the second search process, by composition graphs 4 and Fig. 5 are described in detail respectively below.
Utilize receiving element R
4the radio broadcasting signal being obtained a certain channel B of this TV station by the second search process is received, now, the channel B of this TV station, as current receiving channels, monitors the signal strength signal intensity (step S310) of the radio broadcasting signal of current receiving channels.
Whether threshold value t is more than or equal to the signal strength signal intensity of the radio broadcasting signal of the current receiving channels monitored in step S310
4carry out judging (step S311).If the judged result of step S311 is yes, so stopping receives above-mentioned wireless network signal and stops corresponding playing network HD video information, switches to the broadcast HD video information (step S313) of this TV station of broadcasting and enters step S308.Now, the broadcast HD video information of this TV station corresponds to the broadcast wireless signal of channel B.If the judged result of step S311 is no, then judge whether wireless network cost of use exceedes preset value (step S312) further.
If the judged result of step S312 is yes, judge whether the signal strength signal intensity of the radio broadcasting signal of the current receiving channels monitored in step S310 is more than or equal to threshold value t so further
5(step S314).If the judged result of step S314 is yes, then stops receiving above-mentioned wireless network signal and stop playing corresponding network HD video information, entering step S315, otherwise, return step S309.On the other hand, if the judged result of step S312 is no, so step S309 is returned.
As step S315, start the broadcast SD video information playing this TV station.Further, judge whether the signal strength signal intensity of the radio broadcasting signal of the current receiving channels monitored is more than or equal to described threshold value t
4(step S316).If the judged result of step S316 is yes, so stop the broadcast SD video information playing this TV station, switch to the broadcast HD video information (step S313) of this TV station of broadcasting and enter step S308, if the judged result of step S316 is no, then entering step S317.In step S317, if want the network HD video information starting to play this TV station, then return step S304, otherwise, return step S316.
Fig. 4 is the flow chart that first in the rating changing method of radio broadcasting signal involved in the present invention and wireless network signal searches for the embodiment processed.In step S306, judged result is no or after starting to carry out step S313, carries out the first search process.
First, the signal strength signal intensity (step S401) of the radio broadcasting signal of current receiving channels is obtained.Now, in-car TV TV receiving system uses receiving element R
4the radio broadcasting signal of current receiving channels is received.
Then, judge whether the signal strength signal intensity of the radio broadcasting signal of the current receiving channels obtained in step S401 is more than or equal to threshold value t
1(step S402).If it is then enter step S405 that the judgement of step S402 is become, otherwise, enter step S403.In step S403, judge whether the signal strength signal intensity of the radio broadcasting signal of current receiving channels is less than threshold value t
1and be more than or equal to threshold value t
2.If it is then enter step S409 that the judgement of step S403 is become, otherwise, enter step S404.In step s 404, judge whether the signal strength signal intensity of the radio broadcasting signal of current receiving channels is less than threshold value t
2and be more than or equal to threshold value t
3.If it is then enter step S413 that the judgement of step S404 is become, otherwise, enter step S417.
In step S405, utilize the receiving element R be made up of any one the high-frequency reception path in four high-frequency reception paths 21,22,23,24
1receive the radio broadcasting signal of current receiving channels, utilize the search unit S be made up of the high-frequency reception path of its excess-three in four high-frequency reception paths 21,22,23,24 simultaneously
1whole television broadcast band is searched for all channels of this TV station.Search unit S
1start to search for (step S406), and at search unit S
1search procedure in, judge with search unit S
1corresponding receiving element R
1whether the radio broadcasting signal of the current receiving channels received is less than threshold value t
3(step S407).As receiving element R
1the radio broadcasting signal of the current receiving channels received is less than threshold value t
3time, search unit S
1just stop search (step S408) and enter step S409, otherwise, search unit S
1complete the search (step S419) of all channels of this TV station on whole television broadcast band and enter step S422.
In step S409, utilize the receiving element R be made up of any two the high-frequency reception paths in four high-frequency reception paths 21,22,23,24
2receive the radio broadcasting signal of current receiving channels, utilize the search unit S be made up of two the high-frequency reception paths of all the other in four high-frequency reception paths 21,22,23,24 simultaneously
2whole television broadcast band is searched for all channels of this TV station.Search unit S
2start to search for (step S410), and at search unit S
2search procedure in, judge with search unit S
2corresponding receiving element R
2whether the radio broadcasting signal of the current receiving channels received is less than threshold value t
3(step S411).As receiving element R
2the radio broadcasting signal of the current receiving channels received is less than threshold value t
3time, search unit S
2just stop search (step S412) and enter step S413, otherwise, search unit S
2complete the search (step S420) of all channels of this TV station on whole television broadcast band and enter step S422.
In step S413, utilize the receiving element R be made up of wantonly three the high-frequency reception paths in four high-frequency reception paths 21,22,23,24
3receive the radio broadcasting signal of current receiving channels, utilize the search unit S be made up of the high-frequency reception path of all the other in four high-frequency reception paths 21,22,23,24 simultaneously
3whole television broadcast band is searched for all channels of this TV station.Search unit S
3start to search for (step S414), and at search unit S
3search procedure in, judge with search unit S
3corresponding receiving element R
3whether the radio broadcasting signal of the current receiving channels received is less than threshold value t
3(step S415).As receiving element R
3the radio broadcasting signal of the current receiving channels received is less than threshold value t
3time, search unit S
3just stop search (step S416) and enter step S417, otherwise, search unit S
3complete the search (step S421) of all channels of this TV station on whole television broadcast band and enter step S422.
In step S417, utilize receiving element R
4receive the radio broadcasting signal of current receiving channels.As receiving element R
4the radio broadcasting signal of the current receiving channels received is less than threshold value t
3time, terminate the first search and process and enter step S304, otherwise, return step S401.
In step S422, judge whether the radio broadcasting signal searching multiple channel corresponding with the broadcast HD video information of this TV station.If the judged result of step S422 is yes, so use receiving element R
4receive that radio broadcasting signal that in the radio broadcasting signal of channel corresponding to the broadcast HD video information of above-mentioned multiple and this TV station searched, signal strength signal intensity is maximum, and play the broadcast HD video information (step S423) of this TV station corresponding with it.Now, using the channel of radio broadcasting signal maximum for the signal strength signal intensity that searches as new current receiving channels, step S401 is returned.In addition, when a channel of this TV station is then searched, the signal strength signal intensity of the radio broadcasting signal of this channel is namely as the signal strength signal intensity of the radio broadcasting signal of this channel compared with the signal strength signal intensity of the radio broadcasting signal of other channels of this TV station in step S422.
If the judged result of step S422 is no, so use receiving element R
4receive the radio broadcasting signal searched, and play the HD video information (step S424) of this TV station corresponding with it.Now, using the channel of radio broadcasting signal that searches as new current receiving channels, step S401 is returned.
Fig. 5 is the flow chart that second in the rating changing method of radio broadcasting signal involved in the present invention and wireless network signal searches for the embodiment processed.
First, receiving element R is utilized
4receive the described radio broadcasting signal (step S501) of described current receiving channels.
Judge monitor by receiving element R
4in the signal strength signal intensity of radio broadcasting signal of current receiving channels that receives of any one high-frequency reception path whether be more than or equal to threshold value t
5(step S502).
If the judged result of step S502 is no, so whole four high-frequency reception paths 21,22,23,24 are divided into two groups, thus form search unit S respectively
h1with search unit S
h2, utilize search unit S
h1at the enterprising line search of the television broadcast band of half, utilize search unit S
h2second half television broadcast band carries out described search (step S503).Wherein, search unit S
h1with search unit S
h2two the high-frequency reception paths respectively comprised.Then, if search unit S
h1with search unit S
h2all complete respective search, judge whether to search the radio broadcasting signal (step S504) corresponding with the broadcast HD video information of described TV station.If the judged result of step S504 is yes, then enter step S507.Otherwise, by search unit S
h1with search unit S
h2merge into the search unit S being made up of 21,22,23,24 whole four high-frequency reception paths
4, utilize search unit S
4start search until search the radio broadcasting signal (step S505) corresponding with the broadcast HD video information of this TV station.
If the judged result of step S502 is yes, then carry out step S506, namely utilize receiving element R
1while receiving the radio broadcasting signal of current receiving channels, also utilize search unit S
1carry out described search, after completing search, enter step S507.
In step s 507, the radio broadcasting signal searching multiple channel corresponding with the broadcast HD video information of this TV station is judged whether.If the judged result of step S507 is yes, so carry out step S508, namely use receiving element R
4receive the radio broadcasting signal that in the radio broadcasting signal of multiple channel corresponding with the broadcast HD video information of this TV station, signal strength signal intensity is maximum, using the channel corresponding to it as new current receiving channels, terminate the second search process, enter step S310.In addition, when a channel of this TV station is then searched, the signal strength signal intensity of the radio broadcasting signal of this channel is namely as the signal strength signal intensity of the radio broadcasting signal of this channel compared with the signal strength signal intensity of the radio broadcasting signal of other channels of this TV station in step s 507.
If the judged result of step S507 is no, so carry out step S509, namely use receiving element R
4receive the radio broadcasting signal of that channel searched, using the channel corresponding to it as new current receiving channels, terminate described second search process, enter step S310.
Although below illustrate invention has been in conjunction with the accompanying drawings and embodiments, be appreciated that above-mentioned explanation does not limit the present invention in any form.Those skilled in the art can be out of shape the present invention when not departing from connotation of the present invention and scope as required and change, and these distortion and change all fall within the scope of the present invention.
Claims (4)
1. the rating changing method of a radio broadcasting signal and wireless network signal, receive and/or search for described radio broadcasting signal by the wireless broadcast receiving device with n (n >=2 and for natural number) individual high-frequency reception path, and receive described wireless network signal by 1 wireless network communication apparatus, wherein, high-frequency reception path comprises the tuner that an antenna and follow described antenna, and characteristic of antenna is identical described in each, described in each, the characteristic of tuner is identical, receiving and/or searching in the process of described radio broadcasting signal, described wireless broadcast receiving device can be allowed to include the receiving element of a part of described high-frequency reception path formation to receive the described radio broadcasting signal of a certain channel A of a certain TV station, simultaneously, the search unit including high-frequency reception path formation described in another part is allowed to search for, wherein, described search refers to the described radio broadcasting signal of all channels of the described TV station be received in one by one on television broadcast band, it is characterized in that, comprise:
Step (1-1), utilizes the receiving element R be made up of whole n described high-frequency reception path
nreceive the described radio broadcasting signal of the described channel A of described TV station, and play the broadcast HD video information of described TV station, now, the described channel A of described TV station is as current receiving channels;
Step (1-2), monitors the signal strength signal intensity of the described radio broadcasting signal of described current receiving channels;
Step (1-3), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is more than or equal to described threshold value t
n-1time, return step (1-2), otherwise, enter step (1-4);
Step (1-4), utilize described wireless network communication apparatus to find on network and whether there is network HD video information, described network HD video information is identical with the content of the described broadcast HD video information of described TV station, when searching out described network HD video information, enter step (1-5), otherwise, enter step (1-12);
Step (1-5), starts to receive the described wireless network signal corresponding to described network HD video information;
Step (1-6), if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is less than threshold value t
n, then keep receiving the described radio broadcasting signal of described current receiving channels but the described broadcast HD video information of the described TV station of stopping broadcasting, switch to and play described network HD video information and enter step (1-7), wherein, described threshold value t
n-1be greater than described threshold value t
n, otherwise, stop receiving described wireless network signal and carrying out the first search process;
Step (1-7), carries out the second search process;
Step (1-8), utilizes described receiving element R
nthe described radio broadcasting signal obtaining a certain channel B of described TV station by described second search process is received, now, the described channel B of described TV station, as described current receiving channels, monitors the signal strength signal intensity of the described radio broadcasting signal of described current receiving channels;
Step (1-9), if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored in step (1-8) is more than or equal to described threshold value t
nso stop receiving described wireless network signal and stop playing described network HD video information, switch to the described broadcast HD video information playing described TV station, and carry out described first search process, if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored in step (1-8) is less than described threshold value t
n, then step (1-10) is entered;
Step (1-10), if wireless network cost of use exceedes preset value, so enters step (1-11), otherwise returns step (1-7);
Step (1-11), if the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored in step (1-8) is more than or equal to threshold value t
n+1, then stop receiving described wireless network signal and stop playing described network HD video information, entering step (1-12), wherein said threshold value t
nbe greater than described threshold value t
n+1, otherwise, return step (1-7);
Step (1-12), start the broadcast SD video information playing described TV station, the content of the broadcast SD video information of described TV station is identical with the content of the described broadcast HD video information of described TV station, but the definition of the broadcast SD video information of described TV station is less than the definition of the described broadcast HD video information of described TV station;
Step (1-13), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is more than or equal to described threshold value t
ntime, stop the described broadcast SD video information playing described TV station, switch to the described broadcast HD video information of the described TV station of broadcasting and carry out described first search process, when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels monitored is less than described threshold value t
ntime, then enter step (1-14);
Step (1-14), if want to start to play described network HD video information, then returns step (1-4), otherwise, return step (1-13).
2. the rating changing method of radio broadcasting signal as claimed in claim 1 and wireless network signal, is characterized in that, described first search process comprises:
Step (2-1), obtains the signal strength signal intensity of the described radio broadcasting signal of described current receiving channels;
Step (2-2), when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is more than or equal to threshold value t
1time, utilize the receiving element R be made up of 1 described high-frequency reception path
1receive the described radio broadcasting signal of described current receiving channels, utilize the search unit S be made up of n-1 described high-frequency reception path simultaneously
1carry out described search,
At described search unit S
1described search process in, when with described search unit S
1corresponding described receiving element R
1the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, just stop described search, utilize the receiving element R be made up of 2 described high-frequency reception paths
2receive the described radio broadcasting signal of described current receiving channels, and utilize the receiving element S be made up of n-2 described high-frequency reception path
2re-start described search, otherwise, complete described search and enter step (2-4),
When the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is more than or equal to threshold value t
2and be less than described threshold value t
1time, utilize described receiving element R
2receive the described radio broadcasting signal of described current receiving channels, utilize described search unit S simultaneously
2carry out described search, wherein, described threshold value t
1be greater than described threshold value t
2,
At described search unit S
2described search process in, when with described search unit S
2corresponding described receiving element R
2the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, just stop described search, utilize the receiving element R be made up of 3 described high-frequency reception paths
3receive the described radio broadcasting signal of described current receiving channels, and utilize the receiving element S be made up of n-3 described high-frequency reception path
3re-start described search, otherwise, complete described search and enter step (2-4),
The like, when the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is more than or equal to threshold value t
k(1≤k≤n-1 and k is natural number) and be less than described threshold value t
k-1time, utilize described receiving element R
kreceive the described radio broadcasting signal of described current receiving channels, utilize described search unit S simultaneously
kcarry out described search, wherein, described threshold value t
k-1be greater than described threshold value t
k,
At described search unit S
kdescribed search process in, when with described search unit S
kcorresponding described receiving element R
kthe signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, just stop described search, utilize the receiving element R be made up of k+1 described high-frequency reception path
k+1receive the described radio broadcasting signal of described current receiving channels, and utilize the search unit S be made up of n-k-1 described high-frequency reception path
k+1re-start described search, complete described search and enter step (2-4),
When the signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels obtained in step (2-1) is less than described threshold value t
n-1time, enter step (2-3);
Step (2-3), utilizes described receiving element R
nthe signal of the described radio broadcasting signal of described current receiving channels, as described receiving element R
nthe signal strength signal intensity of the described radio broadcasting signal of the described current receiving channels received is less than described threshold value t
n-1time, terminate described first search and process and enter step (1-4), otherwise, return step (2-1);
Step (2-4), if the described radio broadcasting signal of channel corresponding to the described broadcast HD video information that can search multiple and described TV station, so with described receiving element R
nreceive the described radio broadcasting signal that in the described radio broadcasting signal of channel corresponding to the described broadcast HD video information of the multiple and described TV station searched, signal strength signal intensity is maximum, and play the described broadcast HD video information of the described TV station corresponding with it, now, using the channel of described radio broadcasting signal maximum for the signal strength signal intensity searched as new described current receiving channels, return step (2-1)
If the described radio broadcasting signal of a channel corresponding with the described broadcast HD video information of described TV station can only be searched, so use receiving element R
nreceive the described radio broadcasting signal of the channel searched, and play the described HD video information of the described TV station corresponding with it, now, using the channel of described radio broadcasting signal that searches as new described current receiving channels, step (2-1) is returned.
3. the rating changing method of radio broadcasting signal and wireless network signal as claimed in claim 2, is characterized in that, described threshold value t
k, described threshold value t
n, described threshold value t
n+1the signal strength values be determined in advance,
Described threshold value t
nbe set as follows: when the signal strength signal intensity of the described radio broadcasting signal received is less than described threshold value t
ntime, just can not play the described HD video information that the described radio broadcasting signal that receives is corresponding continuously,
Described threshold value t
n+1be set as follows: when the signal strength signal intensity of the described radio broadcasting signal received is less than described threshold value t
n+1time, just can not play the described SD video information that the described radio broadcasting signal that receives is corresponding continuously.
4. the rating changing method of radio broadcasting signal and wireless network signal as claimed in claim 3, is characterized in that, described second search process comprises:
Step (4-1), utilizes described receiving element R
nreceive the described radio broadcasting signal of described current receiving channels;
Step (4-2), if monitor by described receiving element R
nin any one described in the signal strength signal intensity of described radio broadcasting signal of described current receiving channels that receives of high-frequency reception path be all less than described threshold value t
n+1, so whole n described high-frequency reception path is formed search unit S respectively
h1with search unit S
h2, utilize described search unit S
h1the described television broadcast band of half carries out described search, utilizes described search unit S
h2second half described television broadcast band carries out described search, wherein, when n is even number, described search unit S
h1with described search unit S
h2the quantity of the described high-frequency reception path comprised is identical, when n is odd number, and described search unit S
h1with described search unit S
h2the quantity of the described high-frequency reception path comprised only differs one;
As search unit S
h1and S
h2when can not search the described radio broadcasting signal corresponding with the described broadcast HD video information of described TV station, two described search units are merged into 1 search unit S
n, utilize described search unit S
nstart search until search the described radio broadcasting signal corresponding with the described broadcast HD video information of described TV station, enter step (4-4);
Step (4-3), if monitor by described receiving element R
nin any one described in the signal strength signal intensity of described radio broadcasting signal of described current receiving channels that receives of high-frequency reception path be more than or equal to described threshold value t
n+1, so utilize described receiving element R
1while receiving the described radio broadcasting signal of described current receiving channels, also utilize described search unit S
1carry out described search, after completing described search, enter step (4-4);
Step (4-4), if the described radio broadcasting signal of channel corresponding to the described broadcast HD video information that can search multiple and described TV station, so with described receiving element R
nreceive the described radio broadcasting signal that in the described radio broadcasting signal of channel corresponding to the described broadcast HD video information of multiple and described TV station, signal strength signal intensity is maximum, using the channel corresponding to it as new described current receiving channels, terminate described second search process, enter step (1-8)
If the described radio broadcasting signal of a channel corresponding with the described broadcast HD video information of described TV station can only be searched, so with described receiving element R
nreceive the described radio broadcasting signal of the channel searched, using the channel corresponding to it as new described current receiving channels, terminate described second search process, enter step (1-8).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410175337.6A CN105099590B (en) | 2014-04-28 | 2014-04-28 | The rating switching method of in-car TV TV receiving system and radio broadcasting signal and wireless network signal |
| JP2015078143A JP2015211467A (en) | 2014-04-28 | 2015-04-07 | On-vehicle television viewing system, and viewing switching method between wireless broadcast signal and wireless network signal |
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|---|---|---|---|
| CN201410175337.6A CN105099590B (en) | 2014-04-28 | 2014-04-28 | The rating switching method of in-car TV TV receiving system and radio broadcasting signal and wireless network signal |
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| CN105099590B CN105099590B (en) | 2019-02-19 |
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| CN113661663A (en) * | 2019-02-07 | 2021-11-16 | 奥迪股份公司 | Method for operating a media playback device and media playback device |
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| CN105099590B (en) | 2019-02-19 |
| JP2015211467A (en) | 2015-11-24 |
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