CN102255680A - Method and device for automatically switching digital audio broadcasting (DAB) signal and frequency modulation (FM) signal - Google Patents
Method and device for automatically switching digital audio broadcasting (DAB) signal and frequency modulation (FM) signal Download PDFInfo
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Abstract
The invention relates to a method and device for automatically switching a digital audio broadcasting (DAB) signal and a frequency modulation (FM) signal. The method comprises the following steps of: decoding the DAB signal and the FM signal and caching; acquiring the time difference between a DAB decoded signal and a decoded FM signal according to the power of the decoded FM signal, the power of the DAB decoded signal and signal quality information; and selecting the DAB decoded signal or the decoded FM signal serving as a switching signal according to the signal quality information and the time difference, or mixing the DAB decoded signal with the decoded FM signal to obtain a switching signal. According to the method and the device, time different is calculated by using power for acquiring corresponding DAB signal and FM signal, and automatic switching is performed; moreover, smoothing is performed to make sound continuous in the process.
Description
Technical field
The present invention relates to broadcast singal and switch the field, relate in particular to a kind of automatically switch method and apparatus of digital audio broadcasting signal and FM signal of time difference that utilizes.
Background technology
Digital audio broadcasting (Digital Audio Broadcasting is called for short DAB) is third generation broadcasting---the digital signal broadcasting after AM, FM case of conventional analog broadcast.Than traditional FM FM receiver, it provides the stereo sound that is similar to CD level quality, and possesses the characteristic of the anti-interference and anti-radio wave attenuation of digital data transmission, and DAB broadcasting is very suitable for using in the mobile environment of fierceness, and is for example vehicle-mounted.
But, though the DAB standard is more superior in some aspects than FM, but because its carrier frequency is higher, its signal penetration power is relatively poor, blocks comparatively serious place at some, often just can not receive signal, cause and can't listen to, and this moment, as the FM of analog signal, though sound quality has been subjected to certain influence, but can listen to.
Be applied as vehicular applications because one of DAB is main, and vehicle can move everywhere, so this situation still takes place through regular meeting.At present, a lot of channels, often FM and DAB play simultaneously, if can automatically switch to the FM signal when the poor signal of DAB, and when the DAB signal is normal, switch on the DAB signal, just can on the continuity of listening under the prerequisite that does not reduce listening quality, increase.
But, in the more existing solution that automatically switches to DAB signal and FM signal, the time difference that may on receiving, exist between not good DAB of estimation and the FM, and do not advance process row smoothing processing to automaticallying switch, so cause sound continuity weak effect.
Summary of the invention
The method that the purpose of this invention is to provide automatic switchover digital audio broadcasting signal and FM signal with by monitoring DAB signal and FM signal simultaneously, by the time difference of two signals of power calculation, and is carried out smoothing processing output mixed signal when switching signal.
For achieving the above object, the invention provides a kind of method of automatically switch digital audio broadcasting signal and FM signal, this method comprises:
The digital audio broadcasting signal and the FM signal of the same program source that gets access to are decoded respectively;
Decoded digital audio broadcasting signal and FM signal are carried out buffer memory respectively, comprise DAB decoded signal and signal quality information in the described decoded digital audio broadcasting signal;
Read the described decoded digital audio broadcasting signal and the FM signal of buffer memory, and according to the power of the described decoded FM signal of described buffer memory and the power of DAB decoded signal, and signal quality information, obtain DAB decoded signal in the described decoded digital audio broadcasting signal and the time difference between the FM signal; And
According to described signal quality information and described time difference, select DAB decoded signal in the digital audio broadcasting of described buffer memory or decoded FM signal as switching signal, perhaps mix DAB decoded signal in the described decoded digital audio broadcasting signal of institute's buffer memory and decoded FM signal as switching signal.
Describedly decoded digital audio broadcasting signal and FM signal are carried out buffer memory respectively be specially, described decoded digital audio broadcasting signal and FM signal are carried out buffer memory by the first in first out buffer respectively.
The power of described decoded FM signal according to buffer memory and the power of DAB decoded signal, and signal quality information, the time difference of obtaining between described decoded digital audio broadcasting signal and the FM signal is specially:
When described signal quality information is characterized by when not being cached with the data that write when existing digital audio broadcasting signal bad,
Obtain second power of each frame of first power of each frame of described digital audio broadcasting signal and FM signal;
Obtain the correlation function of described first power and second power;
Choose the maximum of described correlation function argument;
With the product of the value of the sampled point of each frame of described maximum and described digital audio broadcasting signal as the described time difference.
DAB decoded signal in the described decoded digital audio broadcasting signal of described mixing institute buffer memory and decoded FM signal are carried out smoothing processing during as switching signal.
The described smoothing processing of carrying out is specially:
If current what choose is decoded frequcny modulation data, and when described signal quality information is characterized by when not being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this outputting digital audio broadcast singal; Perhaps
If current what choose is decoded digital video broadcast data, and when described signal quality information is characterized by when being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this export FM signal.
A further object of the present invention provides the device of automatic switchover digital audio broadcasting signal and FM signal, with by monitoring DAB signal and FM signal simultaneously, by the time difference of two signals of power calculation, and when switching signal, carry out smoothing processing output mixed signal.
The present invention also provides a kind of device of automatically switch digital audio broadcasting signal and FM signal to achieve these goals, and this device comprises:
The digital audio broadcasting signal decoder, the digital audio broadcasting signal that is used for the same program source that will get access to is decoded;
The FM signal decoder, the FM signal that is used for the same program source that will get access to is decoded;
The digital audio broadcasting signal buffer is used for decoded digital audio broadcasting signal is carried out buffer memory, comprises signal quality information in the described decoded digital audio broadcasting signal;
The FM signal buffer is used for decoded FM signal is carried out buffer memory;
Lock in time calculator, be used to read the described decoded digital audio broadcasting signal and the FM signal of buffer memory, and according to the power of the described decoded FM signal of described buffer memory and the power of DAB decoded signal, and signal quality information, obtain the time difference between described decoded digital audio broadcasting signal DAB decoded signal and the FM signal; And
The signal gating mixture control, be used for according to described signal quality information and described time difference, select the decoded digital audio broadcasting signal DAB decoded signal of described buffer memory or FM signal as switching signal, perhaps mix the described decoded digital audio broadcasting signal DAB decoded signal of the buffer memory that reads and FM signal as switching signal.Described digital audio broadcasting signal buffer and FM signal buffer are respectively the first in first out buffer.
Described lock in time, calculator specifically comprised:
The power acquiring unit, be used for being characterized by when not being cached with the data that write when existing digital audio broadcasting signal bad, obtain second power of each frame of first power of each frame of described digital audio broadcasting signal and FM signal when described signal quality information;
The correlation function value acquiring unit is used to obtain the correlation function of described first power and second power;
Determining unit is used to choose the maximum of described correlation function argument, with the product of the value of the sampled point of each frame of described maximum and described digital audio broadcasting signal as the described time difference.Described signal gating mixture control comprises the smoothing processing device, is used for during as switching signal, carrying out smoothing processing in the DAB decoded signal of the described decoded digital audio broadcasting signal of described mixing institute buffer memory and decoded FM signal.
Described smoothing processing implement body comprises:
First signal output unit, be used for if current what choose is decoded frequcny modulation data, and when described signal quality information is characterized by when not being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this outputting digital audio broadcast singal; And/or
The secondary signal output unit, be used for that current what choose is decoded digital video broadcast data, and when described signal quality information is characterized by when being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this export FM signal.
The present invention has realized utilizing the power calculation time difference to obtain corresponding DAB signal and FM signal by the method and apparatus of automatic switchover digital audio broadcasting signal and FM signal, automatically switch, and in order to make sound continuous, carried out smoothing processing during the course.
Description of drawings
Fig. 1 is the automatically switch flow chart of method of digital audio broadcasting signal and FM signal of the present invention;
Fig. 2 is the automatically switch structural representation of device of digital audio broadcasting signal and FM signal of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
As shown in Figure 1, be the automatically switch flow chart of method of digital audio broadcasting signal and FM signal of the present invention.Fig. 2 is the automatically switch structural representation of device of digital audio broadcasting signal and FM signal of the present invention.As seen from Figure 2, the device of this automatic switchover digital audio broadcasting signal and FM signal by digital audio broadcasting signal (DAB) decoder 21, FM signal (FM) decoder 22, digital audio broadcasting signal buffer 23, FM signal buffer 24, lock in time calculator 25 and signal gating mixture control 26 form.This device also can comprise player 27.
In conjunction with Fig. 1 and Fig. 2, the inventive method is described, specifically may further comprise the steps:
When the DAB decoder is decoded to the DAB signal, this DAB decoder is not only decoded to a frame DAB signal, also obtain signal quality information simultaneously, therefore in the decoded DAB signal, not only include the DAB decoded signal, also have signal quality information, be written in the buffering area of DAB buffer subsequently together; Described decoded digital audio broadcasting signal and FM signal are carried out buffer memory by the first in first out buffer respectively, and length is roughly 0.5-2 second.
Because the DAB coded system is to carry out lossy coding at frequency domain, and Frequency Domain Coding has utilized people's ear for the insensitive characteristic of sound phase place, so after the decoding reduction, bigger variation has taken place in the form in detail of the information on its time domain, but the variation of phase place does not cause the variation of one section long-time slightly energy, so can calculate the energy of a period of time signal, and then by relevant mode computing time.
If the data in the DAB buffer are by M sampled point, according to time sequencing difference D0, D1, D2, D3......DM-1, data in the FM buffer are by N sampled point, according to time sequencing be respectively respectively F0, F1, F2, F3 ... FN-1, the sample rate of data is S (being between Da and the Da-1 or the time phase difference 1/S of Fa and Fa-1), and the every frame of DAB signal comprises L sampled point.Needs roughly differ from t computing time, and just Da and Fa-t are the signal of same time.Therefore, step 13 is specially:
When DAB decodes a frame when being written in the DAB buffering area, if the data that write when not having the DAB poor signal in this buffering area, promptly the signal quality information of institute's buffer memory is characterized by and is not cached with the data that write when existing digital audio broadcasting signal bad in the DAB buffer.
Step 131 is obtained second power of each frame length of first power of each frame length of DAB decoded signal and decoded FM signal;
Promptly calculate power P D0, PD1, PD2......, the PDm of each frame length of DAB decoded signal in the buffer, wherein
M=[M/L], wherein, bracket is for rounding operation downwards, and for example [4.7]=4 are together following
Power FD0, the FD1 of decoded each frame length of FM signal, FD2......, FDn are wherein in the calculating buffer
Step 132 is obtained the correlation function R (x) of described first power and second power;
Step 133 is chosen the maximum of described correlation function argument x; With the product t=x * L of the sum of the sampled point of each frame of described maximum and described digital audio broadcasting signal as the described time difference.
Except above-mentioned situation, when the DAB decoder decode went out in the buffering area that a frame is written to the DAB buffer, if find that wherein the signal quality information of buffer memory shows the data that write when having the DAB poor signal in this buffering area, then t was constant.Because this time, the DAB quality is not good, so may there be mistake in the data that decode, the t that utilize misdata to calculate this moment is insecure, so use the t that last time, correct signal solved, the initial value of t is made as 0.
At first, the signal gating mixture control is selected exportable play signal, and initial conditions are: the junior one is equivalent to the data in the gating FM decoded data buffer memory among for example above-mentioned 0.5m of time of the maximum data that can store of DAB buffer after system reset.Do not satisfying under this condition,
If what current play signal was selected is data in the FM decode buffer,, then continue the data in the gating FM decoded data buffer memory if signal quality information is characterized by data when having poor signal in the DAB buffer;
If what current play signal was chosen is data in the DAB decode buffer,, then continue the data in the gating DAB decoded data buffer memory if signal quality information is characterized by data when not having poor signal in the DAB decode buffer.Above-mentioned both of these case is existing situation.
The signal gating mixture control is selected exportable play signal, and its basic principle is that selection DAB signal when the DAB signal is not good, is selected the FM signal when the DAB signal quality has been.But in the present invention, continuous in order to make sound in the process that play signal is switched, adopt the mode that adds triangular window to carry out transition.I.e. DAB decoded signal and the decoded FM signal during as switching signal of this method in the described decoded digital audio broadcasting signal of described mixing institute buffer memory, carry out smoothing processing, export to player as play signal through the switching signal of smoothing processing.Specify this smoothing processing process below:
Promptly in this embodiment, under the situation that does not satisfy initial condition, if current play signal is chosen is data in the FM decoding buffer memory, if signal quality information is characterized by the data when not having poor signal in the buffer memory in the DAB decode buffer, then export mixed signal in the time of a DAB frame length under connecing, and export the DAB signal in the back, specific as follows:
If the mixed signal of the current buffering area of delivering to player that will read is A0, the back is followed successively by A1, A2, A3......, and a last signal of choosing is A-1, and the signal that correspondence is chosen is Fc-1,, then
F wherein
C+xAnd D
C+t+xBe the signal of same time, t is meant the time difference, wherein selects DAB data D
C+t+xFM data F with correspondence
C+xBe to select by the time difference t that the mode of above-mentioned steps 13 is calculated.
Except above-mentioned situation, also comprise following this situation: under the situation that does not satisfy initial condition, if what current play signal was chosen is data in the DAB decode buffer, if signal quality information is characterized by the data when having poor signal in the buffering in the DAB decode buffer, then export mixed signal in the time of a DAB frame length under connecing, and export the FM signal in the back, specific as follows:
If the mixed signal in the current buffering area of delivering to player that will read is A0, the back is followed successively by A1, A2, A3......, and a last signal of choosing is A-1, and the signal that correspondence is chosen is Dc-1, then
D wherein
C+xAnd F
C+t+xBe the signal of same time, t is meant the time difference, wherein selects DAB data D
C+t+xFM data F with correspondence
C+xBe to select by the time difference t that the mode of above-mentioned steps 13 is calculated.
When above-mentioned signal gating mixture control is selected switching signal as play signal, be to automatically switch to the FM signal during to traditional poor signal as DAB, and the method that switches to the DAB signal when the DAB signal is normal has been made improvement, promptly it has been carried out smoothing processing output mixed signal, thereby make sound not only continuous, and effect is better.
The present invention also provides another embodiment, it is execution in step 11 to 13, promptly utilize in the step 13 and calculate the time difference according to power, thereby find DAB signal and the FM signal of same time, afterwards according to described signal quality information and described time difference, select the decoded digital audio broadcasting signal of described buffer memory or FM signal as switching signal, that is to say under the situation that does not satisfy initial condition, if current play signal is chosen is data in the FM decoding buffer memory, if signal quality information is characterized by the data when not having poor signal in the buffer memory in the DAB decode buffer, then in the time of a DAB frame length under connecing with the DAB signal as switching signal, export to player as play signal; Perhaps under the situation that does not satisfy initial condition, if what current play signal was chosen is data in the DAB decode buffer, if signal quality information is characterized by the data when having poor signal in the buffering in the DAB decode buffer, then in the time of a DAB frame length under connecing with the FM signal as switching signal, export to player as play signal.
The present invention monitors DAB signal and FM signal simultaneously, by the time difference of two signals of power calculation, when the DAB signal is not good, play the audio frequency of FM signal, after the DAB signal recovers well, continue to play the audio frequency of DAB signal, but in order to make sound continuous, carried out smoothing processing during the course.
Continue as shown in Figure 2, wherein DAB decoder and FM decoder are all basic identical with traditional decoder.Different is, the two is worked simultaneously in this device, and the signal of decoding is the identical program that sends with DAB and FM mode.Two decoders directly do not output to player 27 with decoded signal, but output to buffer memory in DAB buffer 23 and the FM data device 24.The sample rate of FM decoder 22 outputs is identical with DAB decoder 21.DAB buffer, FM buffer are the FIFO buffer memorys of two storage decoded datas, and length is roughly 0.5-2 second.
DAB decoding signals 21 in the device of this automatic switchover DAB signal and FM signal, the digital audio broadcasting signal that is used for the same program source that will get access to is decoded; FM signal 22 decoders, the FM signal that is used for the same program source that will get access to is decoded; DAB signal buffer 23 is used for decoded digital audio broadcasting signal is carried out buffer memory, comprises DAB decoded signal and signal quality information in the described decoded digital audio broadcasting signal; FM signal buffer 24 is used for decoded FM signal is carried out buffer memory; Lock in time, calculator 25, be used to read the described decoded digital audio broadcasting signal and the FM signal of buffer memory, and according to the power of the described decoded FM signal of described buffer memory and the power of DAB decoded signal, and signal quality information, obtain the time difference between described decoded digital audio broadcasting signal and the FM signal; Signal gating mixture control 26, be used for according to described signal quality information and described time difference, select the decoded DAB decoded signal of described buffer memory or FM signal as switching signal, perhaps mix DAB decoded signal in the described decoded digital audio broadcasting signal of the buffer memory that reads and FM signal as switching signal.
As shown in Figure 2, this, calculator 25 specifically comprised lock in time:
Correlation function value acquiring unit 252 is used to obtain the correlation function of described first power and second power;
Determining unit 253 is used to choose the maximum of described correlation function argument, with the product of the value of the sampled point of each frame of described maximum and described digital audio broadcasting signal as the described time difference.
Comprise smoothing processing device 261 in the signal gating mixture control 26, be used for during as switching signal, carrying out smoothing processing in the DAB decoded signal of the described decoded digital audio broadcasting signal of described mixing institute buffer memory and decoded FM signal.Except this smoothing processing device 261, also can also comprise being used for according to described signal quality information and described time difference, select the decoded digital audio broadcasting signal of described buffer memory or FM signal switch 262 as switching signal.Signal gating mixture control 26 also can have smoothing processing device 261 and switch 262 simultaneously, perhaps has separately.
Described smoothing processing device 261 specifically comprises:
First signal output unit 2611, be used for if current what choose is decoded frequcny modulation data, and when described signal quality information is characterized by when not being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this outputting digital audio broadcast singal; And/or
Secondary signal output unit 2612, be used for that current what choose is decoded digital video broadcast data, and when described signal quality information is characterized by when being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this export FM signal.
In with signal gating mixture control specific productization, first signal output unit and secondary signal output unit can possess simultaneously, also can only possess one.
The detailed process of computing time difference and smoothing processing, as above-mentioned described in the method, do not repeat them here.
The present invention has realized utilizing the power calculation time difference to obtain corresponding DAB signal and FM signal by the device of automatic switchover digital audio broadcasting signal and FM signal, automaticallyes switch, and during the course in order to make sound continuous, has carried out smoothing processing.The present invention has handled does not effectively have well to estimate time difference that may exist between DAB and the FM on receiving, and do not advance process row smoothing processing to automaticallying switch, cause these problems of sound continuity weak effect, the user is switched under the situation of subjective sensation not having.
The professional should further recognize, the unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, the composition and the step of each example described prevailingly according to function in the above description.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each specific should being used for, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can use the software device of hardware, processor execution, and perhaps the combination of the two is implemented.The software device can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for digital audio broadcasting signal and FM signal that automaticallyes switch is characterized in that, comprising:
The digital audio broadcasting DAB signal and the FM signal of the same program source that gets access to are decoded respectively;
Decoded digital audio broadcasting signal and FM signal are carried out buffer memory respectively, comprise DAB decoded signal and signal quality information in the described decoded digital audio broadcasting signal;
Read the described decoded digital audio broadcasting signal and the FM signal of buffer memory, and according to the power of the described decoded FM signal of described buffer memory and the power of DAB decoded signal, and signal quality information, obtain DAB decoded signal in the described decoded digital audio broadcasting signal and the time difference between the FM signal; And
According to described signal quality information and described time difference, select DAB decoded signal in the digital audio broadcasting of described buffer memory or decoded FM signal as switching signal, perhaps mix DAB decoded signal in the described decoded digital audio broadcasting signal of institute's buffer memory and decoded FM signal as switching signal.
2. the method for automatic switchover digital audio broadcasting signal according to claim 1 and FM signal, it is characterized in that, describedly decoded digital audio broadcasting signal and FM signal are carried out buffer memory respectively be specially, described decoded digital audio broadcasting signal and FM signal are carried out buffer memory by the first in first out buffer respectively.
3. the method for automatic switchover digital audio broadcasting signal according to claim 1 and FM signal, it is characterized in that, the power of described decoded FM signal according to buffer memory and the power of DAB decoded signal, and signal quality information, the time difference of obtaining between described decoded digital audio broadcasting signal and the FM signal is specially:
When described signal quality information is characterized by when not being cached with the data that write when existing digital audio broadcasting signal bad,
Obtain second power of each frame of first power of each frame of described digital audio broadcasting signal and FM signal;
Obtain the correlation function of described first power and second power;
Choose the maximum of described correlation function argument;
With the product of the value of the sampled point of each frame of described maximum and described digital audio broadcasting signal as the described time difference.
4. the method for automatic switchover digital audio broadcasting signal according to claim 1 and FM signal, it is characterized in that, also comprise: DAB decoded signal in the described decoded digital audio broadcasting signal of described mixing institute buffer memory and decoded FM signal are carried out smoothing processing during as switching signal.
5. the method for automatic switchover digital audio broadcasting signal according to claim 4 and FM signal is characterized in that, the described smoothing processing of carrying out is specially:
If current what choose is decoded frequcny modulation data, and when described signal quality information is characterized by when not being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this outputting digital audio broadcast singal; Perhaps
If current what choose is decoded digital video broadcast data, and when described signal quality information is characterized by when being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this export FM signal.
6. the device of digital audio broadcasting signal and FM signal that automaticallyes switch is characterized in that, comprising:
The digital audio broadcasting signal decoder, the digital audio broadcasting signal that is used for the same program source that will get access to is decoded;
The FM signal decoder, the FM signal that is used for the same program source that will get access to is decoded;
The digital audio broadcasting signal buffer is used for decoded digital audio broadcasting signal is carried out buffer memory, comprises signal quality information in the described decoded digital audio broadcasting signal;
The FM signal buffer is used for decoded FM signal is carried out buffer memory;
Lock in time calculator, be used to read the described decoded digital audio broadcasting signal and the FM signal of buffer memory, and according to the power of the described decoded FM signal of described buffer memory and the power of DAB decoded signal, and signal quality information, obtain the time difference between described decoded digital audio broadcasting signal DAB decoded signal and the FM signal; And
The signal gating mixture control, be used for according to described signal quality information and described time difference, select the decoded digital audio broadcasting signal DAB decoded signal of described buffer memory or FM signal as switching signal, perhaps mix the described decoded digital audio broadcasting signal DAB decoded signal of the buffer memory that reads and FM signal as switching signal.
7. the device of automatic switchover digital audio broadcasting signal according to claim 6 and FM signal is characterized in that, described digital audio broadcasting signal buffer and FM signal buffer are respectively the first in first out buffer.
8. the device of automatic switchover digital audio broadcasting signal according to claim 6 and FM signal is characterized in that, described lock in time, calculator specifically comprised:
The power acquiring unit, be used for being characterized by when not being cached with the data that write when existing digital audio broadcasting signal bad, obtain second power of each frame of first power of each frame of described digital audio broadcasting signal and FM signal when described signal quality information;
The correlation function value acquiring unit is used to obtain the correlation function of described first power and second power;
Determining unit is used to choose the maximum of described correlation function argument, with the product of the value of the sampled point of each frame of described maximum and described digital audio broadcasting signal as the described time difference.
9. the device of automatic switchover digital audio broadcasting signal according to claim 6 and FM signal, it is characterized in that, described signal gating mixture control comprises the smoothing processing device, be used for during as switching signal, carrying out smoothing processing in the DAB decoded signal of the described decoded digital audio broadcasting signal of described mixing institute buffer memory and decoded FM signal.
10. the device of automatic switchover digital audio broadcasting signal according to claim 9 and FM signal is characterized in that, described smoothing processing implement body comprises:
First signal output unit, be used for if current what choose is decoded frequcny modulation data, and when described signal quality information is characterized by when not being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this outputting digital audio broadcast singal; And/or
The secondary signal output unit, be used for that current what choose is decoded digital video broadcast data, and when described signal quality information is characterized by when being cached with the data that digital audio broadcasting signal writes when bad, then in the time of next digital audio broadcasting signal frame, export mixed signal, after this export FM signal.
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| CN102833022A (en) * | 2012-08-22 | 2012-12-19 | 中兴通讯股份有限公司 | Device, method and terminal for broadcast switching |
| CN106330366A (en) * | 2016-08-19 | 2017-01-11 | 广州番禺巨大汽车音响设备有限公司 | DAB (Digital Audio Broadcasting) and FM (Frequency Modulation) switching control method and system based on playing device |
| CN107026701A (en) * | 2017-03-02 | 2017-08-08 | 广州小鹏汽车科技有限公司 | A kind of vehicle radio station signal remaining method and device |
| CN110224772A (en) * | 2019-05-16 | 2019-09-10 | 惠州市德赛西威智能交通技术研究院有限公司 | A kind of automatic switchover system and method for FM and CDR broadcast |
| CN110299955A (en) * | 2018-03-21 | 2019-10-01 | 厦门歌乐电子企业有限公司 | A kind of broadcast receiver and method |
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| CN102833022A (en) * | 2012-08-22 | 2012-12-19 | 中兴通讯股份有限公司 | Device, method and terminal for broadcast switching |
| WO2014029244A1 (en) * | 2012-08-22 | 2014-02-27 | 中兴通讯股份有限公司 | Broadcast switching device and method, and terminal |
| US9236961B2 (en) | 2012-08-22 | 2016-01-12 | Zte Corporation | Broadcast switching device, method and terminal |
| CN106330366A (en) * | 2016-08-19 | 2017-01-11 | 广州番禺巨大汽车音响设备有限公司 | DAB (Digital Audio Broadcasting) and FM (Frequency Modulation) switching control method and system based on playing device |
| CN107026701A (en) * | 2017-03-02 | 2017-08-08 | 广州小鹏汽车科技有限公司 | A kind of vehicle radio station signal remaining method and device |
| CN110299955A (en) * | 2018-03-21 | 2019-10-01 | 厦门歌乐电子企业有限公司 | A kind of broadcast receiver and method |
| CN110299955B (en) * | 2018-03-21 | 2024-02-13 | 厦门歌乐电子企业有限公司 | Broadcast receiving device and method |
| CN110224772A (en) * | 2019-05-16 | 2019-09-10 | 惠州市德赛西威智能交通技术研究院有限公司 | A kind of automatic switchover system and method for FM and CDR broadcast |
| CN110224772B (en) * | 2019-05-16 | 2021-05-14 | 惠州市德赛西威智能交通技术研究院有限公司 | Automatic switching system and method for FM and CDR broadcast |
| CN114142955A (en) * | 2020-09-04 | 2022-03-04 | 华为技术有限公司 | Broadcast signal playing method and map generating method and device |
| CN114142955B (en) * | 2020-09-04 | 2024-04-12 | 华为技术有限公司 | Broadcasting signal playing method, map generating method and device |
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