CN101674442B - Device and method used for detecting audio mode of intermediate frequency signal - Google Patents
Device and method used for detecting audio mode of intermediate frequency signal Download PDFInfo
- Publication number
- CN101674442B CN101674442B CN200910093870.7A CN200910093870A CN101674442B CN 101674442 B CN101674442 B CN 101674442B CN 200910093870 A CN200910093870 A CN 200910093870A CN 101674442 B CN101674442 B CN 101674442B
- Authority
- CN
- China
- Prior art keywords
- frequency point
- value
- signal
- point values
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000010355 oscillation Effects 0.000 claims description 33
- 238000001914 filtration Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 9
- 108010001267 Protein Subunits Proteins 0.000 claims description 2
- 230000003534 oscillatory effect Effects 0.000 abstract 2
- DFPAKSUCGFBDDF-UHFFFAOYSA-N Nicotinamide Chemical compound NC(=O)C1=CC=CN=C1 DFPAKSUCGFBDDF-UHFFFAOYSA-N 0.000 description 12
- 230000005236 sound signal Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
The invention discloses a device and a method used for detecting audio mode of an intermediate frequency signal. The device comprises a control logic module used for reading a plurality of standard frequency point values. Among the plurality of standard frequency point values, a similar frequency point group is selected, wherein the absolute value of the difference between a first standard frequency point value and a second standard frequency point value in the similar frequency point group is less than a preset numerical value; the first standard frequency point value is less than the second standard frequency point value; the first standard frequency point value minus a preset frequency deviation value is set as a first substitute frequency point value and the second standard frequency point value plus a preset frequency deviation value is set as a second substitute frequency point value; and the first substitute frequency point value and the second substitute frequency point value substitute for the first standard frequency point value and the second standard frequency point value, thus obtaining an input frequency point value. Besides, the device also comprises a signal processing module which uses the input frequency point value to generate oscillatory wave and judges the type and frequency point of the intermediate frequency signal according to a signal energy value obtained after the frequency mixing of the received intermediate frequency signal and the oscillatory wave. The device and the method can enhance the accuracy of detecting audio mode.
Description
Technical field
The present invention relates to the Sound processing technical field of simulated television, referring in particular to a kind of apparatus and method for detecting intermediate-freuqncy signal audio mode.
Background technology
In the audio frequency process of simulated television, sound intermediate frequency (SIF, Sound Intermediate Frequency) signal after transforming through AD, before carrying out demodulation, need first to detect modulation type and the modulation frequency of the intermediate-freuqncy signal SIF that will modulate.
What present country variant in the world and area adopted is different audio standards, audio mode as main has BTSC, NICAM, A2, EIAJ etc., and often kind of standard has the difference of carrier wave, as the difference due to carrier wave, NICAM audio mode is divided into again NICAM BG, NICAM DK, NICAM I, NICAM L several, therefore there is very big-difference in the intermediate-freuqncy signal SIF in country variant and area, and in demodulator, how accurately to detect that the type of intermediate-freuqncy signal SIF becomes the key technology of audio frequency process.
If Fig. 1 is the structure drawing of device of prior art for intermediate frequency SIF signal type detection, SIF signal is quantized into the digital subsignal of 11 by AD conversion unit 1, the intermediate-freuqncy signal SIF that this process quantizes enters the wave of oscillation that mixing unit 2 and internal oscillator source 3 produce and carries out mixing, audio signal modulation is moved on to base band, after after low-pass filter unit 4 carries out filtering, carry out energy measuring by energy detection unit 5.And control logic unit 6 is for the frequency by existing known each audio mode, input to internal oscillator source 3 successively, produce the wave of oscillation of different frequency.The each value of frequency point inputing to internal oscillator source 3 is also fed back to decision logic unit 7 by this control logic unit 6 successively, and decision logic unit 7 just can judge to input type and the frequency of SIF signal after the signal energy value obtained after each for employing frequency vibration being compared.Afterwards, determined SIF signal type and frequency are input to audio demodulation unit 8 and carry out demodulation.
But because the carrier frequency point of a lot of audio mode is very close, the carrier frequency point as NICAM BG is 5.85MHz and 5.5MHz, and the carrier frequency point of A2 BG is 5.75MHz and 5.5MHz.Find in practical application, the energy value that carrying out using the 5.75MHz of 5.85MHz and the A2 BG of NICAM BG as frequency vibrates obtains closely, therefore when determining type and the frequency inputting SIF signal, easily produces erroneous judgement, causes audio mode to detect inaccurate.
Summary of the invention
The object of technical solution of the present invention is to provide a kind of apparatus and method for detecting intermediate-freuqncy signal audio mode, adopts described apparatus and method, can detect the difference exported when close frequency by energization, thus increase the accuracy that audio mode detects automatically.
For achieving the above object, one aspect of the present invention provides a kind of device for detecting intermediate-freuqncy signal audio mode, comprising:
Control logic module, for: the multiple standard frequency point values reading multiple conventional audio mode carrier wave;
Close frequency group is chosen in multiple described standard frequency point values, described close frequency group comprises two described standard frequency point values, the absolute value of the first standard frequency point values in described close frequency group and the difference of the second standard frequency point values is less than a default value, and described first standard frequency point values is less than described second standard frequency point values, set described first standard frequency point values and deduct a default frequency deviation value as the first replacement value of frequency point, set described second standard frequency point values and add described default frequency deviation value as the second replacement value of frequency point; Described first replaces value of frequency point and described second replaces value of frequency point and replaces described first standard frequency point values in multiple described standard frequency point values and described second standard frequency point values respectively, obtains the multiple input value of frequency point corresponding with multiple described standard frequency point values;
Signal processing module, for utilizing described multiple input value of frequency point to produce multiple wave of oscillation, according to the signal energy value obtained after the intermediate-freuqncy signal of received speech data and wave of oscillation mixing described in each, judges type and the frequency of described intermediate-freuqncy signal.
Preferably, device described above, described signal processing module comprises:
Internal oscillator unit, produces multiple wave of oscillation for utilizing described multiple input value of frequency point;
Mixing unit, for described intermediate-freuqncy signal and the wave of oscillation described in each are carried out mixing respectively, obtains multiple mixed frequency signal;
Low-pass filter unit, for carrying out low-pass filtering to mixed frequency signal described in each;
Energy detection unit, for detecting the described signal energy value obtaining mixed frequency signal described in each after low-pass filtering;
Decision logic unit, for judging type and the frequency of described intermediate-freuqncy signal according to described signal energy value.
Preferably, device described above, described decision logic unit comprises:
Energy judgment sub-unit, determines the peak signal energy value in described signal energy value for judging;
Value of frequency point determination subelement, for determining the described input value of frequency point corresponding with described peak signal energy value;
Signal type determination subelement, for according to described input value of frequency point, determine the corresponding standard frequency point values of described input value of frequency point, described corresponding standard frequency point values is the frequency of described intermediate-freuqncy signal, determines the type of described intermediate-freuqncy signal according to described corresponding standard frequency point values.
Preferably, device described above, described device also comprises: analog-to-digital conversion module, before carrying out mixing in described intermediate-freuqncy signal and the described wave of oscillation, carries out analog-to-digital conversion to described intermediate-freuqncy signal.
Preferably, device described above, described default value is between 100kHz to 150kHz.
Preferably, device described above, described default frequency deviation value is between 30kHz to 80kHz.
The present invention also provides a kind of method for detecting intermediate-freuqncy signal audio mode on the other hand, and described method comprises:
Read multiple standard frequency point values of multiple conventional audio mode carrier wave;
Choose the close frequency group in multiple described standard frequency point values, described close frequency group comprises two described standard frequency point values, the absolute value of the first standard frequency point values in described close frequency group and the difference of the second standard frequency point values is less than a default value, and described first standard frequency point values is less than described second standard frequency point values;
Set described first standard frequency point values and deduct a default frequency deviation value as the first replacement value of frequency point, set described second standard frequency point values and add described default frequency deviation value as the second replacement value of frequency point; Described first replaces value of frequency point and described second replaces value of frequency point and replaces described first standard frequency point values in multiple described standard frequency point values and described second standard frequency point values respectively, obtains the multiple input value of frequency point corresponding with multiple described standard frequency point values;
Utilize described multiple input value of frequency point to produce multiple wave of oscillation, according to the signal energy value obtained after the intermediate-freuqncy signal of received speech data and wave of oscillation mixing described in each, judge type and the frequency of described intermediate-freuqncy signal.
Preferably, method described above, the signal energy value obtained after the described intermediate-freuqncy signal according to received speech data and wave of oscillation mixing described in each, judges that the type of described intermediate-freuqncy signal and the step of frequency comprise:
Judge the peak signal energy value determined in described signal energy value;
Determine the described input value of frequency point corresponding with described peak signal energy value;
According to described input value of frequency point, determine the corresponding standard frequency point values of described input value of frequency point, described corresponding standard frequency point values is the frequency of described intermediate-freuqncy signal, determines the type of described intermediate-freuqncy signal according to described corresponding standard frequency point values.
Preferably, method described above, the signal energy value produced after according to the intermediate-freuqncy signal of received speech data and described wave of oscillation mixing, before judging the type of described intermediate-freuqncy signal and the step of frequency, also comprises:
Described intermediate-freuqncy signal and the wave of oscillation described in each are carried out mixing respectively, obtains multiple mixed frequency signal;
Low-pass filtering is carried out to mixed frequency signal described in each;
Obtain the described signal energy value of mixed frequency signal described in each after low-pass filtering.
Preferably, method described above, before described intermediate-freuqncy signal and the wave of oscillation described in each are carried out the step of mixing respectively, carries out analog-to-digital conversion to described intermediate-freuqncy signal.
Preferably, method described above, described default value is between 100kHz to 150kHz.
Preferably, method described above, described default frequency deviation value is between 30kHz to 80kHz.
At least one in technique scheme has following beneficial effect: described apparatus and method, the wave of oscillation at SIF signal and different frequent points place is utilized to carry out mixing, obtain different energy values, frequency and the type of this SIF signal is detected by this different-energy value, wherein before reception SIF signal, when configuring the frequency in internal oscillator source, two close frequencies are offset respectively, carry out negative bias to the less frequency in two close frequencies to move, larger frequency is just offset, carry out energization and detect the difference exported at this two close frequency, thus obtain the effect increasing the automatic detection accuracy of audio mode.
Accompanying drawing explanation
Fig. 1 is the structure drawing of device of prior art for SIF signal type detection;
Fig. 2 for described in the specific embodiment of the invention for detecting the structural representation of the device of intermediate-freuqncy signal audio mode;
Fig. 3 for described in the specific embodiment of the invention for detecting the schematic flow sheet of the method for intermediate-freuqncy signal audio mode.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
For detecting the method and apparatus of intermediate-freuqncy signal audio mode described in the specific embodiment of the invention, by changing the frequency inputing to internal oscillator source, close in conventional audio mode two standard frequency point is offset respectively, carry out negative bias to the less standard frequency point in two close standard frequency point to move, larger standard frequency point is just offset, carry out energization and detect the difference exported at this two close frequency, to increase the accuracy that audio mode detects automatically.
Fig. 2 for described in the specific embodiment of the invention for detecting the apparatus structure schematic diagram of intermediate-freuqncy signal audio mode, this device mainly comprises: control logic module 10 and signal processing module 20, wherein:
This control logic module 10, for reading multiple standard frequency point values of multiple conventional audio mode carrier wave, and for choosing close frequency group in the plurality of standard frequency point values, this close frequency group comprises two standard frequency point values, the first standard frequency point values in this close frequency group and the second absolute value marking the difference of value of frequency point are less than a default value, and this first standard frequency point values is less than this second standard frequency point values, set this first standard frequency point values and deduct a default frequency deviation value as the first replacement value of frequency point, set this second standard frequency point values and add that this default frequency deviation value replaces value of frequency point as second, this first replaces value of frequency point and this second is replaced value of frequency point and replace this first standard frequency point values in the plurality of standard frequency point values and this second standard frequency point values respectively, obtains the multiple input value of frequency point corresponding with the plurality of standard frequency point values difference.
Wherein this control logic module 10 can complete above-mentioned function by standard frequency point reading unit 11, memory cell 12 and input frequency generation unit 13 3 unit, wherein:
Standard frequency point reading unit 11, for reading the standard frequency point values of multiple conventional audio mode carrier wave; As the frequency table that table 1 is conventional audio mode in the world, this frequency table can be pre-stored within memory cell 12;
Input frequency generation unit 13, for choosing close frequency group in above-mentioned multiple standard frequency point values, this close frequency group comprises two standard frequency point values, and the absolute value of the first standard frequency point values in this close frequency group and the difference of the second standard frequency point values is less than a default value.This default value can preset according to the standard frequency point values easily producing erroneous judgement, when absolute value as the difference experimentally learning two standard frequency point values is less than 100kHz, the wave of oscillation after adopting these two standard frequency point to vibrate and the mixing of SIF signal, and the signal energy value obtained after low-pass filtering is more close, easy generation erroneous judgement, then can set this default value is 100kHz.Best, according to modulating characteristic and the analysis of those standard frequency point values of conventional audio mode, in the specific embodiment of the invention, this default value is between 100kHz to 150kHz.
Table 1
| Numbering | Standard | Carrier wave 1 (MHz) | Carrier wave 2 (MHz) |
| 1 | BTSC | 4.5 | 0 |
| 2 | A2 BG | 5.5 | 5.75 |
| 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 | NICAM I | 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 |
When the absolute value of the difference of judgement two standard frequency point values is less than above-mentioned default value, then the less value of frequency point among two standard frequency point values is carried out negative bias to move, this less value of frequency point deducts one and presets frequency deviation value, larger value of frequency point among these two standard frequency point values then just offsets, this larger value of frequency point adds this default frequency deviation value, obtains corresponding with these two standard frequency point values two and inputs value of frequency point; When the absolute value of the difference judging these two standard frequency point values is greater than above-mentioned default value, then direct using these two standard frequency point values as input value of frequency point.
In the specific embodiment of the invention, best, this default frequency deviation value setting range is between 30kHz to 80kHz.
As table 1, when received SIF signal be carrier wave is the A2BG audio signal of 5.75MHz, because the carrier wave of NICAM BG audio signal to be the carrier wave of 5.85MHz and A2BG audio signal be 5.75MHz is close respectively, when the local frequency arranging internal oscillator source is 5.75MHz and 5.85MHz, signal energy value for detecting output may be the same, therefore correctly can not judge the type of this audio signal.
Therefore, in device described in the specific embodiment of the invention, in order to increase judgement reliability, when arranging the input frequency of internal oscillator unit 21, judge that the absolute value of the difference of the frequency of this two signal carrier is 100kHz, therefore for the frequency of 5.75MHz by input frequency generation unit 13, increase the negative frequency deviation of a 50kHz, for the frequency of 5.85MHz, increase the positive frequency deviation of a 50KHz, make received signal respectively under this two frequency bins institute obtain the difference increase of signal energy.
The process that above-mentioned control logic module 10 sets each input frequency can frequently complete before SIF signal in the reception, each standard frequency point values correspondence of conventional audio mode has an input value of frequency point, when wherein two standard frequency point values comparatively close to time, these two standard frequency point values are carried out positive and negative skew respectively and are obtained corresponding input value of frequency point, when in conventional audio mode, wherein a standard frequency point values be not close standard frequency point values time, then this wherein a standard frequency point values correspondence input value of frequency point remain unchanged.
For detecting the device of intermediate-freuqncy signal audio mode described in the specific embodiment of the invention, after reception SIF signal, first by AD conversion module 30, intermediate-freuqncy signal is quantified as digital subsignal.
Consult Fig. 2, configured a series of input value of frequency point are inputed to internal oscillator unit 21 by the input frequency generation unit 13 of control logic module 10, and this internal oscillator unit 21 utilizes this each input value of frequency point to produce the wave of oscillation that each input value of frequency point is corresponding with this.
This digital subsignal quantized through AD conversion module 30 carries out mixing respectively by signal processing module 20 and each wave of oscillation, obtain multiple mixed frequency signal, and obtain the signal energy value of each mixed frequency signal after respectively low-pass filtering treatment is carried out to each this mixed frequency signal.
Particularly, this signal processing module 20 comprises:
Mixing unit 22, for the digital signal after AD conversion and each wave of oscillation are carried out mixing respectively, obtains multiple mixed frequency signal;
Low-pass filter unit 23, for carrying out low-pass filtering respectively to each mixed frequency signal;
Energy detection unit 24, obtains for detecting the signal energy value that each mixed frequency signal is corresponding after low-pass filtering.
Consult Fig. 2, for detecting the device of intermediate-freuqncy signal audio mode described in the specific embodiment of the invention, also comprise decision logic unit 25, this decision logic unit 25 judges according to multiple signal energy values that energy detection unit 24 obtains the type and the frequency that receive intermediate frequency SIF signal.
Particularly, this decision logic unit 25 comprises:
Energy judgment sub-unit 251, determines the peak signal energy value in above-mentioned acquisition signal energy value for judging;
Value of frequency point determination subelement 252, for determining the input value of frequency point corresponding with this peak signal energy value, the input frequency generation unit 13 of described control logic module 10 is when inputing to internal oscillator unit 21 by each configured input value of frequency point, the input value of frequency point that this configures again by this input frequency generation unit 13 simultaneously feeds back to this value of frequency point determination subelement 252, make value of frequency point determination subelement 252 can the energy value that obtains of each input value of frequency point record corresponding, and after determining maximum energy value, the input value of frequency point that this maximum energy value is corresponding can be determined,
Signal type determination subelement 253, for according to this input value of frequency point, determine the corresponding standard frequency point values of this input value of frequency point, also namely judge whether this input value of frequency point is that skew obtains on the basis of standard frequency point values, if, then calculate corresponding standard frequency point values according to described default frequency deviation value and this input value of frequency point, if not, then directly determine that this input value of frequency point is corresponding standard frequency point values, then this corresponding standard frequency point values is the frequency of received SIF signal, consult table 1, the type of institute receiving intermediate frequency signal SIF can be determined according to this corresponding standard frequency point values.
Afterwards, determined type and frequency are fed back to audio frequency demodulation module 40 by this decision logic unit 25, and this audio frequency demodulation module 40 carries out demodulation according to the SIF signal type and frequency that detect acquisition to institute receiving intermediate frequency signal SIF.
According to above-mentioned, for detecting the device of intermediate-freuqncy signal audio mode described in the specific embodiment of the invention, by the frequency inputing to internal oscillator source is offset, energy measuring is exported and increases, to increase the accuracy that audio mode detects automatically in the difference of two close frequencies.
In addition, the specific embodiment of the invention also provides a kind of method for detecting intermediate-freuqncy signal audio mode on the other hand, consult Fig. 3, the method is from step S301, at reception SIF signal, before detecting SIF signal type, the pre-configured frequency exporting the different frequency wave of oscillation for internal oscillator source, the method comprising the steps of:
S302, read multiple standard frequency point values of multiple conventional audio mode carrier wave, the standard frequency point values of this conventional audio mode carrier wave can be consulted shown in table 1, and the frequency table of this conventional audio mode carrier wave can prestore;
S303, chooses the close frequency group in multiple standard frequency point values, and the absolute value of the first standard frequency point values in this close frequency group and the difference of the second standard frequency point values is less than a default value, and the first standard frequency point values is less than the second standard frequency point values; Wherein this default value can according to the modulating characteristic of conventional audio mode, and analyze the several standard frequency point values easily producing erroneous judgement in advance and set, best, this default value is between 100kHz to 150kHz;
S304, the first standard frequency point values deducts one and presets frequency deviation value as the first replacement value of frequency point, and the second standard frequency point values adds this default frequency deviation value and replaces value of frequency point as second; First, second is replaced value of frequency point and replaces this first standard frequency point values and this second standard frequency point values respectively, obtain corresponding with these two standard frequency point values two and input value of frequency point, in the specific embodiment of the invention, best, this default frequency deviation value setting range is between 30kHz to 80kHz;
S305, obtain the multiple input value of frequency point corresponding respectively with multiple standard frequency point values, each standard frequency point values correspondence has an input value of frequency point, and those input value of frequency point are as the frequency in internal oscillator source;
S306, utilizes and inputs value of frequency point described in each and produce the corresponding wave of oscillation;
S307, receiving intermediate frequency signal, carries out analog-to-digital conversion to SIF signal, is digital subsignal by SIF signal quantization;
S308, carries out mixing respectively by the SIF signal after analog-to-digital conversion conversion and each wave of oscillation, obtains multiple mixed frequency signal;
S309, obtains the signal energy value of each mixed frequency signal to each mixed frequency signal after carrying out low-pass filtering treatment respectively, wherein the corresponding input value of frequency point of each signal energy value;
S310, determine the peak signal energy value in multiple signal energy value, the input value of frequency point corresponding with this peak signal energy value is determined according to this peak signal energy value, and further according to this input value of frequency point, determine the corresponding standard frequency point values of this input value of frequency point, also namely judge whether this input value of frequency point is that skew obtains on the basis of standard frequency point values, if, then calculate corresponding standard frequency point values according to presetting frequency deviation value with this input value of frequency point, if not, then directly determine that this input value of frequency point is corresponding standard frequency point values, then this corresponding standard frequency point values is the frequency of institute receiving intermediate frequency signal SIF, consult table 1, the type of institute receiving intermediate frequency signal SIF can be determined according to this corresponding standard frequency point values,
S311, terminates.
Method described in the specific embodiment of the invention, the wave of oscillation at SIF signal and various criterion frequency place is utilized to carry out mixing, obtain different energy values, frequency and the type of this SIF signal is detected by this different-energy value, wherein before reception SIF signal, when configuring the frequency in internal oscillator source, two close frequencies are offset respectively, carry out negative bias to the less frequency in two close frequencies to move, larger frequency is just offset, carry out energization and detect the difference exported at this two close frequency, thus obtain the effect increasing the automatic detection accuracy of audio mode.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. for detecting a device for intermediate-freuqncy signal audio mode, it is characterized in that, comprising:
Control logic module, for: the multiple standard frequency point values reading multiple conventional audio mode carrier wave;
Close frequency group is chosen in multiple described standard frequency point values, described close frequency group comprises two described standard frequency point values, the absolute value of the first standard frequency point values in described close frequency group and the difference of the second standard frequency point values is less than a default value, and described first standard frequency point values is less than described second standard frequency point values, set described first standard frequency point values and deduct a default frequency deviation value as the first replacement value of frequency point, set described second standard frequency point values and add that described default frequency deviation value replaces value of frequency point as second; Described first replaces value of frequency point and described second replaces value of frequency point and replaces described first standard frequency point values in multiple described standard frequency point values and described second standard frequency point values respectively, obtains the multiple input value of frequency point corresponding with multiple described standard frequency point values;
Signal processing module, multiple wave of oscillation is produced for utilizing described multiple input value of frequency point, and described signal processing module comprises decision logic unit, for the signal energy value obtained after the intermediate-freuqncy signal according to received speech data and wave of oscillation mixing described in each, judge type and the frequency of described intermediate-freuqncy signal; Wherein said decision logic unit comprises: energy judgment sub-unit, determines the peak signal energy value in described signal energy value for judging; Value of frequency point determination subelement, for determining the described input value of frequency point corresponding with described peak signal energy value; Signal type determination subelement, for according to described input value of frequency point, determine the corresponding standard frequency point values of described input value of frequency point, described corresponding standard frequency point values is the frequency of described intermediate-freuqncy signal, determines the type of described intermediate-freuqncy signal according to described corresponding standard frequency point values.
2. device as claimed in claim 1, it is characterized in that, described signal processing module comprises:
Internal oscillator unit, produces multiple wave of oscillation for utilizing described multiple input value of frequency point;
Mixing unit, for described intermediate-freuqncy signal and the wave of oscillation described in each are carried out mixing respectively, obtains multiple mixed frequency signal;
Low-pass filter unit, for carrying out low-pass filtering to mixed frequency signal described in each;
Energy detection unit, for detecting the described signal energy value obtaining mixed frequency signal described in each after low-pass filtering.
3. device as claimed in claim 1, it is characterized in that, described device also comprises:
Analog-to-digital conversion module, before carrying out mixing in described intermediate-freuqncy signal and the described wave of oscillation, carries out analog-to-digital conversion to described intermediate-freuqncy signal.
4. device as claimed in claim 1, it is characterized in that, described default value is between 100kHz to 150kHz.
5. device as claimed in claim 1, it is characterized in that, described default frequency deviation value is between 30kHz to 80kHz.
6., for detecting a method for intermediate-freuqncy signal audio mode, described method comprises:
Read multiple standard frequency point values of multiple conventional audio mode carrier wave;
Choose the close frequency group in multiple described standard frequency point values, described close frequency group comprises two described standard frequency point values, the absolute value of the first standard frequency point values in described close frequency group and the difference of the second standard frequency point values is less than a default value, and described first standard frequency point values is less than described second standard frequency point values;
Set described first standard frequency point values and deduct a default frequency deviation value as the first replacement value of frequency point, set described second standard frequency point values and add that described default frequency deviation value replaces value of frequency point as second; Described first replaces value of frequency point and described second replaces value of frequency point and replaces described first standard frequency point values in multiple described standard frequency point values and described second standard frequency point values respectively, obtains the multiple input value of frequency point corresponding with multiple described standard frequency point values;
Utilize described multiple input value of frequency point to produce multiple wave of oscillation, according to the signal energy value obtained after the intermediate-freuqncy signal of received speech data and wave of oscillation mixing described in each, judge type and the frequency of described intermediate-freuqncy signal;
The signal energy value obtained after the wherein said intermediate-freuqncy signal according to received speech data and wave of oscillation mixing described in each, judges that the type of described intermediate-freuqncy signal and the step of frequency comprise:
Judge the peak signal energy value determined in described signal energy value;
Determine the described input value of frequency point corresponding with described peak signal energy value;
According to described input value of frequency point, determine the corresponding standard frequency point values of described input value of frequency point, described corresponding standard frequency point values is the frequency of described intermediate-freuqncy signal, determines the type of described intermediate-freuqncy signal according to described corresponding standard frequency point values.
7. method as claimed in claim 6, is characterized in that, the signal energy value produced after according to the intermediate-freuqncy signal of received speech data and described wave of oscillation mixing, before judging the type of described intermediate-freuqncy signal and the step of frequency, also comprises:
Described intermediate-freuqncy signal and the wave of oscillation described in each are carried out mixing respectively, obtains multiple mixed frequency signal;
Low-pass filtering is carried out to mixed frequency signal described in each;
Obtain the described signal energy value of mixed frequency signal described in each after low-pass filtering.
8. method as claimed in claim 7, is characterized in that, before described intermediate-freuqncy signal and the wave of oscillation described in each are carried out the step of mixing respectively, carry out analog-to-digital conversion to described intermediate-freuqncy signal.
9. method as claimed in claim 6, it is characterized in that, described default value is between 100kHz to 150kHz.
10. method as claimed in claim 6, it is characterized in that, described default frequency deviation value is between 30kHz to 80kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910093870.7A CN101674442B (en) | 2009-09-22 | 2009-09-22 | Device and method used for detecting audio mode of intermediate frequency signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910093870.7A CN101674442B (en) | 2009-09-22 | 2009-09-22 | Device and method used for detecting audio mode of intermediate frequency signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101674442A CN101674442A (en) | 2010-03-17 |
| CN101674442B true CN101674442B (en) | 2015-01-21 |
Family
ID=42021399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910093870.7A Active CN101674442B (en) | 2009-09-22 | 2009-09-22 | Device and method used for detecting audio mode of intermediate frequency signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101674442B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4818450B1 (en) * | 2010-06-30 | 2011-11-16 | 株式会社東芝 | Graphics processing unit and information processing apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237544A (en) * | 2008-02-20 | 2008-08-06 | 深圳市同洲电子股份有限公司 | A TV program search method and its system |
| CN101340601A (en) * | 2008-08-15 | 2009-01-07 | 北京航空航天大学 | Measurement receiver for digital television |
| CN102510459A (en) * | 2011-10-18 | 2012-06-20 | 深圳Tcl新技术有限公司 | Digital television channel search method and digital television |
-
2009
- 2009-09-22 CN CN200910093870.7A patent/CN101674442B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237544A (en) * | 2008-02-20 | 2008-08-06 | 深圳市同洲电子股份有限公司 | A TV program search method and its system |
| CN101340601A (en) * | 2008-08-15 | 2009-01-07 | 北京航空航天大学 | Measurement receiver for digital television |
| CN102510459A (en) * | 2011-10-18 | 2012-06-20 | 深圳Tcl新技术有限公司 | Digital television channel search method and digital television |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101674442A (en) | 2010-03-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103199942B (en) | A kind of voice communication method and the terminal using the method | |
| CN101089641B (en) | Method, system for implementing audio-frequency equipment test | |
| CN1708898A (en) | Integrated RF signal level detector usable for automatic power level control | |
| CN105376004B (en) | A kind of adaptive tuning device and method and FM receiver | |
| CN101175060A (en) | System, apparatus, and method for processing a received orthogonal frequency division multiplexing signal | |
| CN103731767B (en) | A kind of wireless microphone system and its method of work based on digital pilot frequency | |
| CN104616660A (en) | Intelligent voice broadcasting system and method based on environmental noise detection | |
| JP2007523578A (en) | Devices that convert digital audio broadcast (DAB) signals | |
| CN110031905B (en) | Remote microwave detection device and detection method | |
| CN101674442B (en) | Device and method used for detecting audio mode of intermediate frequency signal | |
| CN1166252A (en) | Appts. and method for demodulating multi-level signal | |
| CN1317829C (en) | Signal processing circuit for tuner | |
| CN104780280A (en) | Audio signal detection method and device | |
| US7518661B2 (en) | System and method of audio detection | |
| CN103033705A (en) | Test method and test system of electronic equipment | |
| CN203416395U (en) | Multipath audio input automatic detection and output priority control apparatus | |
| CN101523777B (en) | Methods and apparatus for power measurement in communication system | |
| CN107196672B (en) | A kind of tuning methods of FM receiver, tuning chip and FM receiver | |
| CN1161888C (en) | Synthesizer type receiver | |
| CN109756236B (en) | Method and system for balancing channel searching effect of vehicle-mounted radio between different regions | |
| CN103079161A (en) | Method and system for testing audio port of handheld equipment | |
| CN2774057Y (en) | Induction device for detecting address on wireless vehicle of movable locomotive | |
| CN1118995C (en) | Four phase frequency shift keying receiver and method for determining its signals | |
| CN114500201B (en) | ASK data decoding device, method, microcontroller and equipment | |
| CN1750607A (en) | Device and method for processing picture of network TV |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210202 Address after: No. 607, 6th floor, shining building, 35 Xueyuan Road, Haidian District, Beijing 100083 Patentee after: BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECHNOLOGY Co.,Ltd. Address before: 100083, Haidian District, Xueyuan Road, Beijing No. 35, Nanjing Ning building, 15 Floor Patentee before: Vimicro Corp. |