CN101420564A - Audio system identifying circuit and terminal - Google Patents
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- CN101420564A CN101420564A CNA2008102279413A CN200810227941A CN101420564A CN 101420564 A CN101420564 A CN 101420564A CN A2008102279413 A CNA2008102279413 A CN A2008102279413A CN 200810227941 A CN200810227941 A CN 200810227941A CN 101420564 A CN101420564 A CN 101420564A
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Abstract
The invention discloses an audio frequency standard identify circuit and a terminal using the circuit. The circuit comprises a matching circuit and a controller. The matching circuit is used for receiving intermediate frequency signals without knowing the audio frequency standard, matches the intermediate frequency signals without knowing the audio frequency standard according to setting frequency points, decides whether the intermediate frequency signals without knowing the audio frequency standard is in line with the audio frequency standard of the setting frequency point or not, and outputs matching results. The controller comprises a frequency point setting unit and a result output unit. The frequency point setting unit is used for setting the frequency points according to the set of carrier wave frequency points with the known audio frequency standard; when the absolute difference value of the carrier wave frequency points with the known audio frequency standard is less than a threshold value, frequency points displacement is carried out on the carrier wave frequency points, the absolute difference value of which is less then the threshold value; the frequency points are set according to the set of the carrier waver frequency points which are displaced; the result output unit is used for outputting the distinguishing result of the audio frequency standard according to the matching results, and controls the frequency point setting unit to set the frequency points according to the distinguishing result of the audio frequency standard. The invention increases the reliability of the identification of the audio frequency standard.
Description
Technical field
The present invention relates generally to field of audio processing, relates in particular to a kind of audio system identifying circuit and uses the terminal of this audio system identifying circuit.
Background technology
Along with science and technology development, television broadcasting and radio broadcasting are increasing to the influence of people's lives, can receive various audio-frequency informations and video information by television broadcasting.The different countries and regions in the world, there is multiple different standard in the simulated television sound accompaniment, as following table:
| Numbering | Standard | Carrier wave 1 (MHz) | Carrier wave 2 (MHz) |
| 1 | BTSC | 4.5 | 0 |
| 2 | A2?BG | 5.5 | 5.74 |
| 3 | A2?DK?option?1 | 6.5 | 6.62 |
| 4 | A2?DK?option?2 | 6.5 | 6.74 |
| 5 | A2?DK?option?3 | 6.5 | 5.74 |
| 6 | A2?M | 4.5 | 4.7 |
| 7 | NICAMI | 6.55 | 6.0 |
| 8 | NICAM?BG | 5.85 | 5.5 |
| 9 | NICAM?DK | 5.85 | 6.5 |
| 10 | FM?mono?1 | 0 | 6.5 |
| 11 | FM?mono?2 | 0 | 5.5 |
| 12 | FM?mono?3 | 0 | 6.0 |
Multiple different audio mode standard has been described in the above-mentioned table, and the carrier frequency point of each audio mode.Therefrom can see: the carrier frequency point of described A2 BG and these two kinds of audio modes of NICAM BG has one to be the same, all be 5.5MHz, and the another one carrier frequency point of these two kinds of audio modes is respectively 5.74MHz and 5.85MHz.Because therefore only poor 0.11MHz between 5.74MHz and the 5.85MHz is easy to cause mistake identification.For other audio mode, also there is same problem.
Summary of the invention
The present invention proposes a kind of audio system identifying circuit and uses the terminal of this audio system identifying circuit, by the method for frequency displacement, can not cause the mistake identification between the close different audio modes of frequency, has improved the reliability of audio mode identification.
Technical scheme of the present invention is achieved in that
A kind of audio system identifying circuit comprises:
Match circuit is used to receive the intermediate-freuqncy signal of unknown audio mode, and according to setting the intermediate-freuqncy signal that frequency mates described unknown audio mode, whether the intermediate-freuqncy signal of judging described unknown audio mode the audio mode of compound described setting frequency, the output matching result;
Controller, described controller comprises frequency setup unit and output unit as a result, described frequency setup unit is used for according to the carrier frequency point of known audio mode the setting frequency being set, when the absolute difference of known audio mode carrier frequency point during less than threshold value, absolute difference is carried out the frequency displacement less than the carrier frequency point of threshold value, the setting frequency is set according to the carrier frequency point after the described displacement;
Described output unit as a result is used for according to described matching result output audio standard recognition result, and controls described frequency setup unit according to described audio mode recognition result the setting frequency is set.
Preferably, described match circuit comprises:
First match circuit, described first match circuit comprise that first frequency mixer, first energy detector, first compare to determine device and energy threshold unit;
Described first frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the first setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described first energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described first comparator is used for the energy of more described first energy detector output and the energy of described energy threshold unit output, judges that whether the described first setting frequency place has carrier wave, exports first matching result.
Preferably, described match circuit also comprises:
Second match circuit, described second match circuit comprise that second frequency mixer, second energy detector, second compare to determine device;
Described second frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the second setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described second energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described second comparator is used for the energy of more described second energy detector output and the energy of described energy threshold unit output, judges that whether the described second setting frequency place has carrier wave, exports second matching result.
Preferably, described first energy detector comprises:
First low pass filter is used for low-pass filtering, filters non-baseband signal;
First integrator is used for integral and calculating baseband signal energy.
Preferably, described second energy detector comprises:
Second low pass filter is used for low-pass filtering, filters non-baseband signal;
The second integral device is used for integral and calculating baseband signal energy.
Preferably, described frequency setup unit comprises:
Memory cell is used to store the carrier frequency point of known audio mode;
Setup unit is used to set the frequency shift value;
Computing unit, when being used for absolute difference when known audio mode carrier frequency point less than threshold value, the frequency shift value of setting according to described setup unit carries out the frequency displacement with absolute difference less than the carrier frequency point of threshold value;
Selected cell is used for according to the audio mode recognition result of the described output of output unit as a result the setting frequency being set, and described setting frequency is according to the carrier frequency point of known audio mode or the carrier frequency point setting after the displacement.
A kind of terminal comprises receiving element, is used for also comprising audio system identifying circuit from the network side received audio signal, and described audio system identifying circuit comprises:
Match circuit is used to receive the intermediate-freuqncy signal of unknown audio mode, and according to setting the intermediate-freuqncy signal that frequency mates described unknown audio mode, whether the intermediate-freuqncy signal of judging described unknown audio mode the audio mode of compound described setting frequency, the output matching result;
Controller, described controller comprises frequency setup unit and output unit as a result, described frequency setup unit is used for according to the carrier frequency point of known audio mode the setting frequency being set, when the absolute difference of known audio mode carrier frequency point during less than threshold value, absolute difference is carried out the frequency displacement less than the carrier frequency point of threshold value, the setting frequency is set according to the carrier frequency point after the described displacement;
Described output unit as a result is used for according to described matching result output audio standard recognition result, and controls described frequency setup unit according to described audio mode recognition result the setting frequency is set.
Preferably, described match circuit comprises:
First match circuit, described first match circuit comprise that first frequency mixer, first energy detector, first compare to determine device and energy threshold unit;
Described first frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the first setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described first energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described first comparator is used for the energy of more described first energy detector output and the energy of described energy threshold unit output, judges that whether the described first setting frequency place has carrier wave, exports first matching result.
Preferably, described match circuit also comprises:
Second match circuit, described second match circuit comprise that second frequency mixer, second energy detector, second compare to determine device;
Described second frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the second setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described second energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described second comparator is used for the energy of more described second energy detector output and the energy of described energy threshold unit output, judges that whether the described second setting frequency place has carrier wave, exports second matching result.
Preferably, described first energy detector comprises:
First low pass filter is used for low-pass filtering, filters non-baseband signal;
First integrator is used for integral and calculating baseband signal energy.
Preferably, described second energy detector comprises:
Second low pass filter is used for low-pass filtering, filters non-baseband signal;
The second integral device is used for integral and calculating baseband signal energy.
Preferably, described frequency setup unit comprises:
Memory cell is used to store the carrier frequency point of known audio mode;
Setup unit is used to set the frequency shift value;
Computing unit, when being used for absolute difference when known audio mode carrier frequency point less than threshold value, the frequency shift value of setting according to described setup unit carries out the frequency displacement with absolute difference less than the carrier frequency point of threshold value;
Selected cell is used for according to the audio mode recognition result of the described output of output unit as a result the setting frequency being set, and described setting frequency is according to the carrier frequency point of known audio mode or the carrier frequency point setting after the displacement.
Technical solutions according to the invention, the method that enlarges by frequency difference can not cause mistake identification to the different audio modes of frequency close (absolute difference of frequency is less than threshold value), thereby improve the reliability of audio mode identification.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the composition structure chart of a kind of audio system identifying circuit first embodiment of the present invention;
Fig. 2 is the composition structure chart of a kind of audio system identifying circuit second embodiment of the present invention;
Fig. 3 is the composition structure chart of first energy detector in the described audio system identifying circuit;
Fig. 4 is the composition structure chart of a kind of audio system identifying circuit the 3rd embodiment of the present invention;
Fig. 5 is the composition structure chart of second energy detector in the described audio system identifying circuit;
Fig. 6 is the composition structure chart of frequency setup unit described in the described audio system identifying circuit;
Fig. 7 is the schematic diagram that identification error takes place in the prior art;
Fig. 8 is for adopting the schematic diagram of discerning after the technical solution of the present invention;
Fig. 9 is the composition structural representation of a kind of terminal first embodiment of the present invention;
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
With reference to Fig. 1, show the composition structure chart of a kind of audio system identifying circuit first embodiment of the present invention.Described audio system identifying circuit comprises controller 10 and match circuit 20, and described controller 10 comprises frequency setup unit 110 and output unit 120 as a result.
Wherein, described frequency setup unit 110 is used for according to the carrier frequency point of known audio mode the setting frequency being set, when the absolute difference of known audio mode carrier frequency point during less than threshold value, absolute difference is carried out the frequency displacement less than the carrier frequency point of threshold value, the setting frequency is set according to the carrier frequency point after the described displacement;
Described output unit as a result 120 is used for according to described matching result output audio standard recognition result, and controls described frequency setup unit 110 according to described audio mode recognition result the setting frequency is set.
Described match circuit 20, receive the intermediate-freuqncy signal (SIF of unknown audio mode, sound intermediatefrequency), according to setting the intermediate-freuqncy signal that frequency mates described unknown audio mode, whether the intermediate-freuqncy signal of judging described unknown audio mode the audio mode of compound described setting frequency, the output matching result.
Described frequency setup unit 110 is under controller 10 and the control of output unit 120 as a result, carrier frequency point according to known audio mode is provided with the setting frequency, when the carrier frequency point close (absolute difference of carrier frequency point is less than threshold value) of different audio modes, absolute difference is carried out the frequency displacement less than the carrier frequency point of threshold value, the setting frequency is set according to the carrier frequency point after the described displacement.
With A2 BG and NICAM BG is example, the carrier frequency point of A2 BG and these two kinds of audio modes of NICAM BG has one to be the same, all be 5.5MHz, and the another one carrier frequency point of these two kinds of audio modes is respectively 5.74MHz and 5.85MHz, in order under the close situation of these two carrier frequency points, to distinguish this two kinds of audio modes more accurately, the present invention is by enlarging the frequency difference of carrier frequency point, be moved to 5.70MHz as a carrier frequency point from 5.74MHz A2 BG, the carrier frequency point of NICAM BG is moved to 5.95MHz from 5.85MHz, thereby make the carrier beat of A2 BG and NICAM BG expand 0.25MHz to from 0.11MHz, owing to enlarged frequency difference, thereby mistake identification can not take place in the identification of back, improve the accuracy of identification.
When the carrier frequency point not close (absolute difference of carrier frequency point is more than or equal to threshold value) of different audio modes, directly carrier frequency point is set to set frequency, when the carrier frequency point of different audio modes is close, will be set to set frequency after the corresponding carrier frequency point displacement.
Described threshold value can be set accordingly according to corresponding required precision, when very high, can set the threshold to a less value as required precision, as 0.1, when not high, can set the threshold to a bigger value, as 0.5 as required precision.To the not strict qualification of described threshold value, can get different numerical value as required in the various embodiments of the present invention.Described shift value also can be provided with different displacements according to the processing of reality, as 5.74MHz being moved to 5.70MHz, also it can be moved to 5.65MHz or other numerical value, 5.85MHz is moved to 5.95MHz, also it can be moved to 5.90MHz or other numerical value.In order to enlarge frequency difference each other and better to handle, usually with past littler numerical value direction displacement less in two carrier frequency points, past bigger numerical value direction displacement that will be bigger, thereby enlarge frequency difference each other, as between 5.74MHz and 5.85MHz, with the past little displacement of 5.74MHz, with the past big displacement of 5.85MHz, thus expansion frequency difference between the two.
Described match circuit 20 is used to receive the intermediate-freuqncy signal of unknown audio mode, according to setting the intermediate-freuqncy signal that frequency mates described unknown audio mode, whether the intermediate-freuqncy signal of judging described unknown audio mode the audio mode of compound described setting frequency, the output matching result.
Because waveform all has certain width, so though the carrier frequency point of known audio mode has passed through certain displacement, but when in the described unknown audio mode during compound this audio mode, still can mate accurately, described matching result is binary number 1 or 0 in embodiments of the present invention.
Described output unit as a result 120 is used for according to described matching result output audio standard recognition result, and controls described frequency setup unit 110 according to described audio mode recognition result the setting frequency is set.
The course of work of described each several part, operation principle and beneficial effect will make a more detailed description in the back, get final product with reference to the description of relevant portion.
Technical solutions according to the invention, the method by frequency difference enlarges can not cause mistake identification to the close different audio modes of frequency, thereby has improved the reliability of audio mode identification.
With reference to Fig. 2, show the composition structure chart of a kind of audio system identifying circuit second embodiment of the present invention.Described audio system identifying circuit comprises controller 10 and match circuit 20, described controller 10 comprises frequency setup unit 110 and output unit 120 as a result, described match circuit 20 comprises first match circuit 210, and described first match circuit 210 comprises that first frequency mixer 211, first energy detector 212, first compare to determine device 213 and energy threshold unit 214.
Described first frequency mixer 211 is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the first setting frequency, converts described intermediate-freuqncy signal to baseband signal.
Described first energy detector 212 is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy.
Described first comparator is used for the energy of more described first energy detector 212 outputs and the energy of described energy threshold unit 214 outputs, judges that whether the described first setting frequency place has carrier wave, exports first matching result.
With reference to Fig. 3, show the composition structure chart of first energy detector 212 in the described audio system identifying circuit, wherein, described first energy detector 212 comprises first low pass filter 2121 and first integrator 2122.
Described first low pass filter 2121 is used for low-pass filtering, filters non-baseband signal.
Described first integrator 2122 is used for integral and calculating baseband signal energy.
Present embodiment has only the situation of a carrier wave at audio mode.Thereby only intermediate-freuqncy signal and setting frequency of unknown audio mode need be compared.
With reference to Fig. 4, show the composition structure chart of a kind of audio system identifying circuit the 3rd embodiment of the present invention.Described audio system identifying circuit comprises controller 10 and match circuit 20, described controller 10 comprises frequency setup unit 110 and output unit 120 as a result, described match circuit 20 comprises first match circuit 210 and second match circuit 220, described first match circuit 210 comprises that first frequency mixer 211, first energy detector 212, first compare to determine device 213 and energy threshold unit 214, and described second match circuit 220 comprises that second frequency mixer 221, second energy detector 222, second compare to determine device 223.
Described first frequency mixer 211 is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the first setting frequency, converts described intermediate-freuqncy signal to baseband signal.
Described first energy detector 212 is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy.
Described first comparator is used for the energy of more described first energy detector 212 outputs and the energy of described energy threshold unit 214 outputs, judges that whether the described first setting frequency place has carrier wave, exports first matching result.
Described second frequency mixer 221 is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the second setting frequency, converts described intermediate-freuqncy signal to baseband signal.
Described second energy detector 222 is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy.
Described second compares to determine device 223 is used for the energy of more described second energy detector 222 outputs and the energy of described energy threshold unit output, judges that whether the described second setting frequency place has carrier wave, exports second matching result.
Described first match circuit 210 and described second match circuit 220 are arranged side by side, and first frequency mixer 211 in described first match circuit 210, first energy detector 212, first compare to determine device 213 and second frequency mixer 221, second energy detector 222, second in described second match circuit 220 to compare to determine device 223 all be identical on the course of work and operation principle.
The energy threshold unit of described energy threshold unit in can shared first match circuit 210 also can be provided with an independently energy threshold unit, the energy threshold unit in shared first match circuit 210 of present embodiment.
Because on the course of work and the operation principle all is identical, under description in unification is described, do not distinguish first, second.The intermediate-freuqncy signal of unknown audio mode is displaced downwardly to intermediate-freuqncy signal near the base band through the two-way frequency mixer simultaneously, and the complicated low-pass filtering of energy detector filters non-baseband signal, and integral and calculating baseband signal energy.Compare to determine device and compare, judge whether set the frequency place has carrier wave by energy and threshold energy with energy detector output.If set the frequency place carrier wave is arranged, energy detector just has bigger output so, and greater than energy threshold, compare to determine device like this and just export 1, showing has the setting frequency in the SIF signal, just export 0 otherwise compare to determine device, does not set frequency in the expression SIF signal.Controller 10 is recurrent state machines, it can be controlled described frequency setup unit 110 and go to attempt different frequency combinations, and analysis compares to determine the output of device, thereby judge compound which kind of audio mode of SIF, when capturing correct standard, by the 120 output recognition results of output unit as a result, and be locked under this standard.
With reference to Fig. 3, show the composition structure chart of first energy detector 212 in the described audio system identifying circuit, wherein, described first energy detector 212 comprises first low pass filter 2121 and first integrator 2122.
Described first low pass filter 2121 is used for low-pass filtering, filters non-baseband signal.
Described first integrator 2122 is used for integral and calculating baseband signal energy.
Equally, with reference to Fig. 5, described second energy detector 222 comprises second low pass filter 2221 and second integral device 2222.
Described second low pass filter 2221 is used for low-pass filtering, filters non-baseband signal.
Described second integral device 2222 is used for integral and calculating baseband signal energy.
With reference to Fig. 6, show the composition structure chart of frequency setup unit 110 described in the audio system identifying circuit of the present invention.Described frequency setup unit 110 comprises:
The front is described, and described shift value can be set accordingly according to the characteristic of each audio mode carrier frequency point.No longer illustrate at this.
When the carrier frequency point not close (absolute difference of carrier frequency point is more than or equal to threshold value) of different audio modes, described selected cell 614 directly carrier frequency point is set to set frequency, when the carrier frequency point of different audio modes was close, described selected cell 614 was selected to be set to set frequency through the carrier frequency point after described computing unit 613 displacements.
Technical solutions according to the invention, the method by frequency difference enlarges can not cause mistake identification to the close different audio modes of frequency, thereby has improved the reliability of audio mode identification.
With reference to Fig. 7, for the schematic diagram of identification error takes place in the prior art.
As can be seen from the figure, no matter unknown input SIF is A2 BG or NICAM is BG, when frequency being set to A2 BG and NICAM BG, the output testing result may be the same, so just causes the mistake of A2 BG and NICAM BG to discern.
With reference to Fig. 8, for adopting the schematic diagram of discerning after the technical solution of the present invention.
To moving to left, the frequency of the NICAM BG of setting moves right with the frequency of the A2 BG that sets.Like this, A2 BG that the script frequency is very approaching and the 2nd frequency of NICAM BG have separated now, and the energy determinant just can provide result very accurately like this, have increased the reliability of standard identification.
Use same scheme to distinguish at A2 DK and NICAM DK and NICAM I.It is the same that A2 DK has a frequency with NICAM DK, all is 6.5MHz, and the another one frequency is respectively 5.74 and 5.85MHz, this with above-mentioned be the same, can enlarge their frequency difference with same scheme, increase the reliability of identification.
With reference to Fig. 9, show the composition structural representation of a kind of terminal first embodiment of the present invention.Described terminal 900 comprises receiving element 910 and audio system identifying circuit 100.The concrete composition of described audio system identifying circuit 100 and the course of work thereof and operation principle are described in detail in front, in order to save length, do not repeat them here.
Described terminal can also comprise other parts, and the present invention does not limit this, and described terminal can be the device that television receiver and other need carry out audio mode identification.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. an audio system identifying circuit is characterized in that, comprising:
Match circuit is used to receive the intermediate-freuqncy signal of unknown audio mode, and according to setting the intermediate-freuqncy signal that frequency mates described unknown audio mode, whether the intermediate-freuqncy signal of judging described unknown audio mode the audio mode of compound described setting frequency, the output matching result;
Controller, described controller comprises frequency setup unit and output unit as a result, described frequency setup unit is used for according to the carrier frequency point of known audio mode the setting frequency being set, when the absolute difference of known audio mode carrier frequency point during less than threshold value, absolute difference is carried out the frequency displacement less than the carrier frequency point of threshold value, the setting frequency is set according to the carrier frequency point after the described displacement;
Described output unit as a result is used for according to described matching result output audio standard recognition result, and controls described frequency setup unit according to described audio mode recognition result the setting frequency is set.
2. audio system identifying circuit according to claim 1 is characterized in that, described match circuit comprises:
First match circuit, described first match circuit comprise that first frequency mixer, first energy detector, first compare to determine device and energy threshold unit;
Described first frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the first setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described first energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described first comparator is used for the energy of more described first energy detector output and the energy of described energy threshold unit output, judges that whether the described first setting frequency place has carrier wave, exports first matching result.
3. audio system identifying circuit according to claim 2 is characterized in that, described match circuit also comprises:
Second match circuit, described second match circuit comprise that second frequency mixer, second energy detector, second compare to determine device;
Described second frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the second setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described second energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described second comparator is used for the energy of more described second energy detector output and the energy of described energy threshold unit output, judges that whether the described second setting frequency place has carrier wave, exports second matching result.
4. audio system identifying circuit according to claim 2 is characterized in that, described first energy detector comprises:
First low pass filter is used for low-pass filtering, filters non-baseband signal;
First integrator is used for integral and calculating baseband signal energy.
5. audio system identifying circuit according to claim 3 is characterized in that, described second energy detector comprises:
Second low pass filter is used for low-pass filtering, filters non-baseband signal;
The second integral device is used for integral and calculating baseband signal energy.
6. according to each described audio system identifying circuit of claim 1 to 5, it is characterized in that described frequency setup unit comprises:
Memory cell is used to store the carrier frequency point of known audio mode;
Setup unit is used to set the frequency shift value;
Computing unit, when being used for absolute difference when known audio mode carrier frequency point less than threshold value, the frequency shift value of setting according to described setup unit carries out the frequency displacement with absolute difference less than the carrier frequency point of threshold value;
Selected cell is used for according to the audio mode recognition result of the described output of output unit as a result the setting frequency being set, and described setting frequency is according to the carrier frequency point of known audio mode or the carrier frequency point setting after the displacement.
7. a terminal comprises receiving element, is used for it is characterized in that from the network side received audio signal, and also comprise audio system identifying circuit, described audio system identifying circuit comprises:
Match circuit is used to receive the intermediate-freuqncy signal of unknown audio mode, and according to setting the intermediate-freuqncy signal that frequency mates described unknown audio mode, whether the intermediate-freuqncy signal of judging described unknown audio mode the audio mode of compound described setting frequency, the output matching result;
Controller, described controller comprises frequency setup unit and output unit as a result, described frequency setup unit is used for according to the carrier frequency point of known audio mode the setting frequency being set, when the absolute difference of known audio mode carrier frequency point during less than threshold value, absolute difference is carried out the frequency displacement less than the carrier frequency point of threshold value, the setting frequency is set according to the carrier frequency point after the described displacement;
Described output unit as a result is used for according to described matching result output audio standard recognition result, and controls described frequency setup unit according to described audio mode recognition result the setting frequency is set.
8. terminal according to claim 7 is characterized in that, described match circuit comprises:
First match circuit, described first match circuit comprise that first frequency mixer, first energy detector, first compare to determine device and energy threshold unit;
Described first frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the first setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described first energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described first comparator is used for the energy of more described first energy detector output and the energy of described energy threshold unit output, judges that whether the described first setting frequency place has carrier wave, exports first matching result.
9. terminal according to claim 8 is characterized in that, described match circuit also comprises:
Second match circuit, described second match circuit comprise that second frequency mixer, second energy detector, second compare to determine device;
Described second frequency mixer is used to receive the intermediate-freuqncy signal of unknown audio mode, and carries out mixing with the second setting frequency, converts described intermediate-freuqncy signal to baseband signal;
Described second energy detector is used for the non-baseband signal of low-pass filter, integral and calculating baseband signal energy;
Described second comparator is used for the energy of more described second energy detector output and the energy of described energy threshold unit output, judges that whether the described second setting frequency place has carrier wave, exports second matching result.
10. terminal according to claim 8 is characterized in that, described first energy detector comprises:
First low pass filter is used for low-pass filtering, filters non-baseband signal;
First integrator is used for integral and calculating baseband signal energy.
11. terminal according to claim 9 is characterized in that, described second energy detector comprises:
Second low pass filter is used for low-pass filtering, filters non-baseband signal;
The second integral device is used for integral and calculating baseband signal energy.
12., it is characterized in that described frequency setup unit comprises according to each described terminal of claim 7 to 11:
Memory cell is used to store the carrier frequency point of known audio mode;
Setup unit is used to set the frequency shift value;
Computing unit, when being used for absolute difference when known audio mode carrier frequency point less than threshold value, the frequency shift value of setting according to described setup unit carries out the frequency displacement with absolute difference less than the carrier frequency point of threshold value;
Selected cell is used for according to the audio mode recognition result of the described output of output unit as a result the setting frequency being set, and described setting frequency is according to the carrier frequency point of known audio mode or the carrier frequency point setting after the displacement.
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| CNA2008102279413A CN101420564A (en) | 2008-12-02 | 2008-12-02 | Audio system identifying circuit and terminal |
| CN 200910126596 CN101505387B (en) | 2008-12-02 | 2009-03-16 | Audio mode identification circuit and audio mode identification method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102279413A CN101420564A (en) | 2008-12-02 | 2008-12-02 | Audio system identifying circuit and terminal |
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| CNA2008102279413A Pending CN101420564A (en) | 2008-12-02 | 2008-12-02 | Audio system identifying circuit and terminal |
| CN 200910126596 Active CN101505387B (en) | 2008-12-02 | 2009-03-16 | Audio mode identification circuit and audio mode identification method |
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| CN106961598B (en) | 2017-03-17 | 2019-02-12 | 浙江大华技术股份有限公司 | A kind of signaling mode judgment method and device |
| CN107345828B (en) * | 2017-07-31 | 2019-12-06 | 迈克医疗电子有限公司 | Liquid level detection method, device and system |
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| CN1057936A (en) * | 1990-06-26 | 1992-01-15 | 机械电子工业部石家庄第五十四研究所 | Capacity extended digital and analog mixed transmission method |
| KR960007407B1 (en) * | 1993-03-12 | 1996-05-31 | 삼성전자주식회사 | Stereo/dual voice checking system |
| HU219256B (en) * | 1994-03-31 | 2001-03-28 | Arbitron Co | Apparatus and method for including a code having at least one code frequency component with an audio signal having a plurality of audio signal frequency components |
| JP4928737B2 (en) * | 2005-04-26 | 2012-05-09 | 株式会社東芝 | Electronic device and broadcasting method judgment method |
| CN2790071Y (en) * | 2005-04-27 | 2006-06-21 | 陕西凌华电子有限公司 | Television assembly |
| JP2007201912A (en) * | 2006-01-27 | 2007-08-09 | Orion Denki Kk | Broadcasting station extracting method by language of program audio and electronic device equipped with the same |
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| CN101505387B (en) | 2013-04-17 |
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