CN105451128B - LED shows method, circuit and the stereo set of audible spectrum - Google Patents
LED shows method, circuit and the stereo set of audible spectrum Download PDFInfo
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- CN105451128B CN105451128B CN201410441498.5A CN201410441498A CN105451128B CN 105451128 B CN105451128 B CN 105451128B CN 201410441498 A CN201410441498 A CN 201410441498A CN 105451128 B CN105451128 B CN 105451128B
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Abstract
The invention discloses a kind of methods that LED shows audible spectrum, and this method includes establishing the relation table of volume and maximum power value；The current volume of power amplifier is obtained, and inquires the relation table of volume and maximum power value according to current volume, obtains maximum power value of the power amplifier under the volume；According to corresponding maximum power value under the volume and preset LED luminance exponent number N, a power threshold of high-frequency band under the volume corresponding (N-1) and corresponding (N-1) a power threshold of low frequency band are set；The output power of power amplifier and the frequency information of current audio signals are obtained every preset time period, and according to the frequency information, a power threshold of the output power of power amplifier (N-1) corresponding with high-frequency band under the volume or corresponding (N-1) a power threshold of low frequency band are compared respectively；According to comparison result, the flicker state of LED is controlled.The present invention can realize the audible spectrum display function of stereo set by LED light.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of LED shows that method, circuit and the sound equipment of audible spectrum are set
It is standby.
Background technology
Currently, the type of stereo set is more and more, the function of stereo set is also more and more personalized.But existing
Numerous stereo sets in, do not occur also currently by LED light realize audible spectrum display function stereo set.
Invention content
The main object of the present invention is to provide a kind of can realize stereo set audible spectrum display function by LED light
The method that LED shows audible spectrum.
To achieve the above object, the present invention provides a kind of method that LED shows audible spectrum, and the LED shows audio frequency
The method of spectrum includes the following steps：
Step S01：Maximum power value of the power amplifier under each volume is obtained, and establishes volume and the relationship of maximum power value
Table；
Step S02：The current volume of power amplifier is obtained, and obtains the current volume information of power amplifier according to the current volume,
And according to the relation table of volume and maximum power value described in the current volume information inquiry, it is right under current volume to obtain power amplifier
The maximum power value answered；
Step S03：According to corresponding maximum power value under the current volume and preset LED luminance exponent number N, according to pre-
It is corresponding (N-1) to set a power threshold of high-frequency band corresponding (N-1) and low frequency band under computation rule calculating current volume
A power threshold；Wherein, N is the positive integer more than or equal to 2；
Step S04：Output power when power amplifier plays current audio signals is obtained every preset time period and described is worked as
The frequency information of preceding audio signal, and according to the frequency information of the current audio signals, the output power is worked as with described
Corresponding (N-1) a power threshold of high-frequency band is compared or respectively by the output power and the current sound under preceding volume
Lower corresponding (N-1) a power threshold of low frequency band of amount is compared respectively；
Step S05：According to comparison result, the flicker state of LED is controlled.
Preferably, when maximum power value of the power amplifier under each volume is that power amplifier plays 0dB sine waves under each volume
Output power.
Preferably, the frequency range of the high-frequency band is 5KHZ-20KHZ, and the frequency range of the low frequency band is
20HZ-5KHZ。
Preferably, the step S04 is specially：
Output power and the present video letter when power amplifier plays current audio signals are obtained every preset time period
Number frequency information；When the frequency of the current audio signals be more than 5KHZ and less than 20KHZ when, then by the output power with
Corresponding (N-1) a power threshold of high-frequency band is compared respectively under the current volume；When the current audio signals
It is when frequency is more than 20HZ and is less than 5KHZ, then the output power is corresponding with low frequency band under the current volume (N-1)
A power threshold is compared respectively.
Preferably, the preset time period is 10ms.
In addition, to achieve the above object, the present invention also provides the circuit that a kind of LED shows audible spectrum, the LED is shown
The circuit of audible spectrum includes power amplifier, data processing module, control module and LED display circuit；Wherein,
The data processing module for obtaining maximum power value of the power amplifier under each volume, and establishes volume and maximum
The relation table of performance number；And the current volume for obtaining power amplifier, and according to the current sound of current volume acquisition power amplifier
Information is measured, and according to the relation table of volume and maximum power value described in the current volume information inquiry, obtains power amplifier current
Corresponding maximum power value under volume；It is additionally operable to bright according to corresponding maximum power value under the current volume and preset LED
Exponent number N is spent, a power threshold of high-frequency band corresponding (N-1) and low frequency frequency under current volume are calculated according to preset computation rule
Corresponding (N-1) a power threshold of section, and output this to the control module；Wherein, N is the positive integer more than or equal to 2；And
And it is additionally operable to detect output power and the current sound when power amplifier plays current audio signals every preset time period
The frequency information of frequency signal, and the frequency information of the output power and the current audio signals is exported to the control
Module；
The control module, for according to the frequency informations of the current audio signals, by the output power with it is described
Under current volume corresponding (N-1) a power threshold of high-frequency band be compared respectively or by the output power with it is described current
Corresponding (N-1) a power threshold of low frequency band is compared respectively under volume, and exports corresponding control according to comparison result
Signal is to the LED display circuit；
LED display circuit, for according to the control signal, according to preset flicker state into line flicker；
The input terminal of the data processing module is connect with the power amplifier, the output end of the data processing module with it is described
The sampling input terminal of control module connects；The control output end of the control module is connect with the LED display circuit.
Preferably, the sample frequency of the control module is 50HZ100HZ.
Preferably, the data processing module is dsp chip；The control module is microcontroller.
Preferably, the LED display circuit include operating voltage input terminal, the first NPN triode, the second NPN triode,
First resistor, second resistance, 3rd resistor, the 4th resistance and LED light group；Wherein,
The anode of the LED light group is connect with the operating voltage input terminal, and the cathode of the LED light group is connected to
One node, first node are connect with the collector of the collector of the first NPN triode and the second NPN triode respectively；The
The base stage of one NPN triode through first resistor and the control module the first I/O mouthfuls connect, the transmitting of the first NPN triode
Pole is grounded through 3rd resistor；The base stage of second NPN triode through second resistance and the control module the 2nd I/O mouthfuls connect,
The emitter of second NPN triode is through the 4th resistance eutral grounding.
In addition, to achieve the above object, the present invention also provides a kind of stereo set, the stereo set includes that LED is shown
The circuit of audible spectrum, the LED show that the circuit of audible spectrum includes power amplifier, data processing module, control module and LED aobvious
Show circuit；Wherein,
The data processing module for obtaining maximum power value of the power amplifier under each volume, and establishes volume and maximum
The relation table of performance number；And the current volume for obtaining power amplifier, and according to the current sound of current volume acquisition power amplifier
Information is measured, and according to the relation table of volume and maximum power value described in the current volume information inquiry, obtains power amplifier current
Corresponding maximum power value under volume；It is additionally operable to bright according to corresponding maximum power value under the current volume and preset LED
Exponent number N is spent, a power threshold of high-frequency band corresponding (N-1) and low frequency frequency under current volume are calculated according to preset computation rule
Corresponding (N-1) a power threshold of section；Wherein, N is the positive integer more than or equal to 2；Also, it is additionally operable to examine every preset time period
The frequency information of the output power and the current audio signals when power amplifier plays current audio signals is surveyed, and will be described
Output power and the frequency information of the current audio signals are exported to the control module；
The control module, for according to the frequency informations of the current audio signals, by the output power with it is described
Under current volume corresponding (N-1) a power threshold of high-frequency band be compared respectively or by the output power with it is described current
Corresponding (N-1) a power threshold of low frequency band is compared respectively under volume, and exports corresponding control according to comparison result
Signal is to the LED display circuit；
LED display circuit, for according to the control signal, according to preset flicker state into line flicker；
The input terminal of the data processing module is connect with the power amplifier, the output end of the data processing module with it is described
The sampling input terminal of control module connects；The control output end of the control module is connect with the LED display circuit.
The method that LED provided by the invention shows audible spectrum, including step S01：First, power amplifier is obtained under each volume
Maximum power value, and establish the relation table of volume and maximum power value；Step S02：Then, the current volume of power amplifier is obtained,
And according to the current volume obtain power amplifier current volume information, and according to volume described in the current volume information inquiry with
The relation table of maximum power value obtains power amplifier corresponding maximum power value under current volume；Step S03：Then, according to described
Corresponding maximum power value and preset LED luminance exponent number N under current volume are calculated according to preset computation rule under current volume
A power threshold of high-frequency band corresponding (N-1) and corresponding (N-1) a power threshold of low frequency band；Wherein, N be more than etc.
In 2 positive integer；Step S04：Then, every preset time period obtain power amplifier play current audio signals when output power with
And the frequency information of the current audio signals；And according to the frequency information of the current audio signals, by the output power
(N-1) corresponding with high-frequency band under the current volume a power threshold is compared or respectively by the output power and institute
Corresponding (N-1) a power threshold of low frequency band under current volume is stated to be compared respectively；Step S05：Finally, according to compare knot
Fruit controls the flicker state of LED.The method that the LED provided by the invention shows audible spectrum can realize sound equipment by LED light
The audible spectrum display function of equipment so that stereo set is more and more personalized, so as to greatly expand stereo set
Market.
Description of the drawings
Fig. 1 is the flow diagram for one embodiment of method that LED of the present invention shows audible spectrum；
Fig. 2 is the electrical block diagram for one embodiment of circuit that LED of the present invention shows audible spectrum.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of method that LED shows audible spectrum.
Referring to Fig.1, Fig. 1 is the flow diagram for one embodiment of method that LED of the present invention shows audible spectrum.
In the present embodiment, the method which shows audible spectrum includes the following steps：
Step S01：Maximum power value of the power amplifier under each volume is obtained, and establishes volume and the relationship of maximum power value
Table；
Specifically, maximum power value of the power amplifier under each volume is that power amplifier plays 0dB sine waves under each volume and (do not press
The signal source of contracting) when output power, i.e. the present embodiment LED show audible spectrum method, first be obtain power amplifier in each sound
Output power when 0dB sine waves is played under amount, and establishes the relation table of volume and maximum power value.In the present embodiment, if work(
Be placed with ten single order volumes, respectively Vol30, Vol31, Vol32, Vol33, Vol34, Vol35, Vol36, Vol37, Vol38,
Vol39 and Vol40 corresponds to a dB value per rank volume, and the corresponding dB values of Vol30 are 0dB, and the corresponding dB values of Vol31 are 1dB,
The corresponding dB values of Vol32 are 2dB, and the corresponding dB values of Vol33 are 3dB, and the corresponding dB values of Vol34 are 4dB, the corresponding dB of Vol35
Value is 5dB, and the corresponding dB values of Vol36 are 6dB, and the corresponding dB values of Vol37 are 7dB, and the corresponding dB values of Vol38 are 8dB, Vol39
Corresponding dB values are 9dB, and the corresponding dB values of Vol40 are 10dB, i.e., in the present embodiment, the volume of foundation and the pass of maximum power value
It is that table is as shown in table 1.
Table 1
| Volume | Vol30 | Vol31 | Vol32 | Vol33 | Vol34 | Vol35 | Vol36 | Vo137 | Vol38 | Vol39 | Vol40 |
| DB values | 0dB | 1dB | 2dB | 3dB | 4dB | 5dB | 6dB | 7dB | 8dB | 9dB | 10dB |
| Maximum power value | 30W | 35W | 40W | 45W | 50W | 52W | 54W | 56W | 58W | 60W | 62W |
Step S02：The current volume of power amplifier is obtained, and obtains the current volume information of power amplifier according to the current volume,
And according to the relation table of volume and maximum power value described in the current volume information inquiry, it is right under current volume to obtain power amplifier
The maximum power value answered；
Specifically, the method that the present embodiment LED shows audible spectrum, when the pass for establishing above-mentioned volume and maximum power value
It is then to obtain the corresponding dB values of current volume of power amplifier, and above-mentioned sound is inquired according to the corresponding dB values of the current volume after table
The relation table of amount and maximum power value inquires above-mentioned table 1, obtain power amplifier corresponding maximum power value under current volume.Example
Such as, if power amplifier current volume is Vol30, the current volume information of the power amplifier got is that 0dB can by inquiring above-mentioned table 1
With get power amplifier under current volume (Vol30) corresponding maximum power value be 30W.
Step S03：According to corresponding maximum power value under the current volume and preset LED luminance exponent number N, according to pre-
It is corresponding (N-1) to set a power threshold of high-frequency band corresponding (N-1) and low frequency band under computation rule calculating current volume
A power threshold；Wherein, N is the positive integer more than or equal to 2；
Specifically, if LED luminance exponent number N values are bigger, LED shows that the effect of audible spectrum is better, because of luminance step
Number is more, then people can be allowed to feel that the brightness change of LED is exactly to become with the played music of power amplifier closer to the sense organ of people
Change.With LED luminance exponent number N=3, (i.e. LED shows 3 kinds of different brightness to the present embodiment, respectively most bright, brighter and dark three
Kind of brightness) for illustrated the method that shows audible spectrum to the LED.
Since human ear to the susceptibility of sound is gradually increased from bass and high frequency audio, i.e., under Same Efficieney level,
The sound that high frequency audio sounds is smaller, therefore, high again and again under same volume when setting power threshold in the present embodiment
The power threshold of section will be set to be large a bit relative to the power threshold of low frequency band under the volume, i.e., in the present embodiment, high frequency
The corresponding power threshold of frequency range and the corresponding power threshold of low frequency band are separated.In the present embodiment, due to LED luminance exponent number
N=3, it is necessary to set low frequency band corresponds under corresponding 2 power thresholds of high-frequency band and current volume under current volume
2 power thresholds.
In the present embodiment, the preset computation rule of corresponding 2 power thresholds of high-frequency band is respectively A1 under current volume
=B × C1% and A2=B × C2%, wherein A1 is corresponding first power threshold of high-frequency band under current volume, and A2 is to work as
Corresponding second power threshold of high-frequency band under preceding volume, B be power amplifier under current volume corresponding maximum power value (according to
Described in step S02, i.e. B=30W), C1% and C2% be respectively less than 1 percent value (due to music on the market be all with-
6dB goes compression, that is, is less than 0dB, therefore each power threshold in the present embodiment will will be multiplied by a percentage, allows power valve
Value is less than the maximum power value under the volume).For example, the current volume of power amplifier is Vol30, if high-frequency band corresponds under the volume
First power threshold A1=10W, i.e. 10W=30W × C1%, then C1%=1/3；If high-frequency band is corresponding under the volume
Second power threshold A2=15W, i.e. 15W=30W × C2%, then C2%=0.5.
In the present embodiment, the preset computation rule of corresponding 2 power thresholds of low frequency band is respectively A3 under current volume
=B × C3% and A4=B × C4%, wherein A3 is corresponding first power threshold of low frequency band under current volume, and A4 is to work as
Corresponding second power threshold of low frequency band under preceding volume, B be power amplifier under current volume corresponding maximum power value (according to
Described in step S02, i.e. B=30W), C3% and C4% are the percent value for being respectively less than 1.For example, the current volume of power amplifier is
When Vol30, if low frequency band corresponding first power threshold A3=6W, i.e. 6W=30W × C3% under the volume, then C3%=
0.2；If low frequency band corresponding second power threshold A2=10W, i.e. 10W=30W × C4% under the volume, then C4%=1/
3。
In the present embodiment, the frequency range of above-mentioned high-frequency band is 5KHZ-20KHZ (treble portion of corresponding music), on
The frequency range for stating low frequency band is 20HZ-5KHZ (bass part of corresponding music), i.e., frequency range is by the present embodiment
The power threshold that the power threshold and frequency range of 5KHZ-20KHZ is 20HZ-5KHZ separates, i.e., in the present embodiment, LED is to height
Sound and bass carry out different flicker states.
Step S04：Output power when power amplifier plays current audio signals is obtained every preset time period and described is worked as
The frequency information of preceding audio signal；And according to the frequency information of the current audio signals, the output power is worked as with described
Corresponding (N-1) a power threshold of high-frequency band is compared or respectively by the output power and the current sound under preceding volume
Lower corresponding (N-1) a power threshold of low frequency band of amount is compared respectively；
Specifically, in the present embodiment, above-mentioned preset time period is 10ms, i.e. the present embodiment is to obtain one every the 10ms times
The frequency information of output power and the current audio signals when secondary power amplifier broadcasting current audio signals, when the current sound
The frequency of frequency signal is more than 5KHZ and when less than 20KHZ (falling within the scope of above-mentioned high-frequency band), then the power amplifier that will get
Output power above-mentioned 2 power thresholds (10W and 15W) corresponding with high-frequency band under power amplifier current volume compared respectively
Compared with；It (is fallen within the scope of above-mentioned low frequency band) when the frequency of the current audio signals is more than 20HZ and is less than 5KHZ, then
By the output power of the power amplifier got above-mentioned 2 power thresholds corresponding with low frequency band under power amplifier current volume (6W and
10W) it is compared respectively.
Step S05：According to comparison result, the flicker state of LED is controlled.
Specifically, if the current volume of power amplifier is Vol30, the current audio signals that power amplifier is played are that high frequency audio (is worked as
The frequency of preceding audio signal is fallen within the scope of above-mentioned high-frequency band), and for the first time sample power amplifier play current audio signals when
Output power be 20W, sample for the second time power amplifier play current audio signals when output power be 8W, then for the first time sample
Output power (20W) when playing current audio signals to power amplifier is more than high-frequency band under power amplifier current volume and corresponds to second work(
Rate threshold values (15W), the display brightness to control LED are most bright；And when sampling power amplifier broadcasting current audio signals for the second time
Output power (8W) be less than power amplifier current volume under high-frequency band correspond to first power threshold (10W), to control LED's
Display brightness is most dark, so that the brightness of LED becomes most dark from most bright, i.e. the brightness of LED presents variation, that is, makes
LED shows flicker state.And so on, when the output power difference of front and back double sampling to power amplifier, LED just will present not
Same brightness, so that LED shows different flicker states.
The present embodiment is that 3 kinds of brightness of LED are provided with to 2 power thresholds, also, each volume under each volume
Under high frequency audio and the power threshold of bass all separately set, when the output power of power amplifier is more than corresponding power threshold,
LED is just flickered accordingly.If the brightness type of LED is more, more more personalized flicker effect can be made.
The method that LED provided in this embodiment shows audible spectrum obtains maximum power of the power amplifier under each volume first
Value, and establish the relation table of volume and maximum power value；Then, the current volume information of power amplifier is obtained, and according to described current
Information volume inquires the relation table of the volume and maximum power value, obtains power amplifier corresponding maximum power under current volume
Value；Then, it according to corresponding maximum power value under the current volume and preset LED luminance exponent number N, is advised according to preset calculating
Then calculate a power threshold of high-frequency band under current volume corresponding (N-1) and corresponding (N-1) a power valve of low frequency band
Value；Wherein, N is the positive integer more than or equal to 2；Then, it is obtained when power amplifier plays current audio signals every preset time period
The frequency information of output power and the current audio signals；And according to the frequency information of the current audio signals, by institute
State low frequency frequency under output power (N-1) corresponding with high-frequency band under the current volume a power threshold or the current volume
Corresponding (N-1) a power threshold of section is compared respectively；Finally, according to comparison result, the flicker state of LED is controlled.This reality
The method that the LED for applying example offer shows audible spectrum can realize the audible spectrum display function of stereo set by LED light,
So that stereo set is more and more personalized, so as to greatly expand the market of stereo set.
The present invention also provides the circuits that a kind of LED shows audible spectrum.
It is the electrical block diagram for one embodiment of circuit that LED of the present invention shows audible spectrum with reference to Fig. 2, Fig. 2.
In the present embodiment, which shows that the circuit of audible spectrum includes power amplifier 101, data processing module 102, control mould
Block 103 and LED display circuit 104.
Specifically, the input terminal of data processing module 102 is connect with power amplifier 101, the output end of data processing module 102 with
The sampling input terminal of control module 103 connects；The control output end of control module 103 is connect with LED display circuit 104.
Wherein, above-mentioned data processing module 102 for obtaining maximum power value of the power amplifier 101 under each volume, and is established
The relation table of volume and maximum power value；And the current volume information for obtaining power amplifier 101, and according to the current volume
The relation table of volume and maximum power value described in information inquiry obtains the corresponding maximum power value under current volume of power amplifier 101；
It is additionally operable to according to corresponding maximum power value under the current volume and preset LED luminance exponent number N, according to preset computation rule
A power threshold of high-frequency band corresponding (N-1) and corresponding (N-1) a power threshold of low frequency band under current volume are calculated,
And by a power threshold of high-frequency band under the current volume corresponding (N-1) and corresponding (N-1) a power valve of low frequency band
Value is exported to the control module 103；Wherein, N is the positive integer more than or equal to 2；Also, it is additionally operable to examine every preset time period
Survey the power amplifier 101 play current audio signals when output power and the current audio signals frequency information, and will
The output power and the frequency information of the current audio signals are exported to the control module 103；
Specifically, in the present embodiment, maximum power value of the power amplifier 101 under each volume is that power amplifier 101 is broadcast under each volume
Output power when 0dB sine waves (i.e. unpressed signal source) is put, data processing module 102 is getting power amplifier 101 each
When maximum power value under volume, then the relation table of volume and maximum power value is established.In the present embodiment, if power amplifier 101 has ten
Single order volume, respectively Vol30, Vol31, Vol32, Vol33, Vol34, Vol35, Vol36, Vol37, Vol38, Vol39 and
Vol40, corresponds to a dB value per rank volume, and the corresponding dB values of Vol30 are 0dB, and the corresponding dB values of Vol31 are 1dB, Vol32 pairs
The dB values answered are 2dB, and the corresponding dB values of Vol33 are 3dB, and the corresponding dB values of Vol34 are 4dB, and the corresponding dB values of Vol35 are 5dB,
The corresponding dB values of Vol36 are 6dB, and the corresponding dB values of Vol37 are 7dB, and the corresponding dB values of Vol38 are 8dB, the corresponding dB of Vol39
Value is 9dB, and the corresponding dB values of Vol40 are 10dB, i.e., in the present embodiment, volume and maximum work that data processing module 102 is established
The relation table of rate value is as shown in table 1.
Table 1
| Volume | Vol30 | Vol31 | Vol32 | Vol33 | Vol34 | Vol35 | Vol36 | Vol37 | Vol38 | Vol39 | Vol40 |
| DB values | 0dB | 1dB | 2dB | 3dB | 4dB | 5dB | 6dB | 7dB | 8dB | 9dB | 10dB |
| Maximum power value | 30W | 35W | 40W | 45W | 50W | 52W | 54W | 56W | 58W | 60W | 62W |
Data processing module 102 then obtains the current sound of power amplifier 101 after establishing the relation table of volume and maximum power value
Information is measured, and according to the relation table of volume and maximum power value described in the current volume information inquiry, obtains power amplifier 101 and is working as
Corresponding maximum power value under preceding volume.For example, if 101 current volume of power amplifier is Vol30, data processing module 102 obtains
The current volume information of the power amplifier 101 arrived is 0dB, and then data processing module 102 can obtain again by inquiring above-mentioned table 1
To power amplifier 101, (Vol30) corresponding maximum power value is 30W under current volume.
Data processing module 102 is getting (Vol30) the corresponding maximum power value under current volume of power amplifier 101
After (30W), then according to corresponding maximum power value (30W) under the current volume and preset LED luminance exponent number N, according to pre-
It is corresponding (N-1) to set a power threshold of high-frequency band corresponding (N-1) and low frequency band under computation rule calculating current volume
A power threshold；Wherein, N is the positive integer more than or equal to 2.Specifically, LED luminance exponent number N values are bigger, then LED shows audio
The effect of frequency spectrum is better, because brightness exponent number is more, then people can be allowed to feel that the brightness of LED becomes closer to the sense organ of people
Change is exactly to change with 101 played music of power amplifier.With LED luminance exponent number N=3, (i.e. LED shows 3 kinds not to the present embodiment
Same brightness, respectively most bright, brighter and dark three kinds of brightness).Again due to human ear to the susceptibility of sound be from bass and
High frequency audio gradually increases, i.e., under Same Efficieney level, the sound that high frequency audio sounds is smaller, therefore, in the present embodiment,
When setting power threshold, under same volume, the power valve of the power threshold of high-frequency band relative to low frequency band under the volume
Value will be set to be large a bit, i.e., in the present embodiment, the corresponding power threshold of high-frequency band and the corresponding power threshold of low frequency band
It is separated.In the present embodiment, due to LED luminance exponent number N=3, data processing module 102 needs to set current volume
Corresponding 2 power thresholds of low frequency band under corresponding 2 power thresholds of lower high-frequency band and current volume.
In the present embodiment, the preset computation rule of corresponding 2 power thresholds of high-frequency band is respectively A1 under current volume
=B × C1% and A2=B × C2%, wherein A1 is corresponding first power threshold of high-frequency band under current volume, and A2 is to work as
Corresponding second power threshold of high-frequency band under preceding volume, B are the corresponding maximum power value under current volume of power amplifier 101
The percent value that (according to step S02, i.e. B=30W), C1% and C2% are respectively less than 1 is (since music on the market is all
Compression is gone with -6dB, that is, is less than 0dB, therefore each power threshold in the present embodiment will will be multiplied by a percentage, allow work(
Rate threshold values is less than the maximum power value under the volume).For example, the current volume of power amplifier 101 is Vol30, if high frequency under the volume
Frequency range corresponding first power threshold A1=10W, i.e. 10W=30W × C1%, then C1%=1/3；If high again and again under the volume
Section corresponding second power threshold A2=15W, i.e. 15W=30W × C2%, then C2%=0.5.
In the present embodiment, the preset computation rule of corresponding 2 power thresholds of low frequency band is respectively A3 under current volume
=B × C3% and A4=B × C4%, wherein A3 is corresponding first power threshold of low frequency band under current volume, and A4 is to work as
Corresponding second power threshold of low frequency band under preceding volume, B are the corresponding maximum power value under current volume of power amplifier 101
(according to step S02, i.e. B=30W), C3% and C4% are the percent value for being respectively less than 1.For example, the current sound of power amplifier 101
When amount is Vol30, if low frequency band corresponding first power threshold A3=6W, i.e. 6W=30W × C3% under the volume, then
C3%=0.2；If low frequency band corresponding second power threshold A2=10W, i.e. 10W=30W × C4% under the volume, then
C4%=1/3.
In the present embodiment, the frequency range of above-mentioned high-frequency band is 5KHZ-20KHZ (treble portion of corresponding music), on
The frequency range for stating low frequency band is 20HZ-5KHZ (bass part of corresponding music), i.e., frequency range is by the present embodiment
The power threshold that the power threshold and frequency range of 5KHZ-20KHZ is 20HZ-5KHZ separates, i.e., in the present embodiment, LED is to height
Sound and bass carry out different flicker states.
Corresponding 2 power thresholds of the high-frequency band in the case where setting current volume of data processing module 102 (i.e. above-mentioned A1 and
A2) and after corresponding 2 power thresholds of low frequency band (i.e. above-mentioned A3 and A4), then high-frequency band under current volume is corresponding
2 power thresholds (i.e. above-mentioned A1 and A2) and corresponding 2 power thresholds of low frequency band (i.e. above-mentioned A3 and A4) output are extremely controlled
Molding block 103.
Also, data processing module 102 setting set current volume under corresponding 2 power thresholds of high-frequency band (i.e.
Above-mentioned A1 and A2) and corresponding 2 power thresholds of low frequency band (i.e. above-mentioned A3 and A4) after, then every preset time period detect
The frequency information of output power and the current audio signals when power amplifier 101 plays current audio signals, and by institute
The frequency information for stating output power and the current audio signals is exported to the control module 103.
Above-mentioned control module 103, for the frequency information according to the current audio signals, by the output power and institute
Corresponding (N-1) a power threshold of high-frequency band under current volume is stated to be compared respectively or work as the output power with described
Corresponding (N-1) a power threshold of low frequency band is compared respectively under preceding volume, and exports corresponding control according to comparison result
Signal processed is to the LED display circuit 104；
Specifically, in the present embodiment, when the frequency of the current audio signals is more than 5KHZ and (is fallen into less than 20KHZ
Within the scope of above-mentioned high-frequency band) when, then output power and work(when control module 103 is by the broadcasting current audio signals of power amplifier 101
Corresponding above-mentioned 2 power thresholds (10W and 15W) of high-frequency band under 101 current volumes are put to be compared respectively；When described current
The frequency of audio signal is more than 20HZ and (is fallen within the scope of above-mentioned low frequency band) when being less than 5KHZ, then control module 103 will
Power amplifier 101 plays output power above-mentioned 2 work(corresponding with low frequency band under 101 current volume of power amplifier when current audio signals
Rate threshold values (6W and 10W) is compared respectively, and exports corresponding control signal to the LED display circuit according to comparison result
104。
Above-mentioned LED display circuit 104, the control signal for being exported according to control module 103, according to preset flicker shape
State is into line flicker.
Specifically, if the current volume of power amplifier 101 is Vol30, the current audio signals that power amplifier 101 is played are high frequency audio
(i.e. the frequency of current audio signals is fallen within the scope of above-mentioned high-frequency band), and sampling power amplifier 101 plays current sound for the first time
Output power when frequency signal is 20W, and the output power sampled for the second time when power amplifier 101 plays current audio signals is 8W,
The output power (20W) when power amplifier 101 plays current audio signals is then sampled for the first time is more than height under 101 current volume of power amplifier
Frequent section corresponds to second power threshold (15W), and the display brightness to control LED is most bright；Power amplifier 101 is sampled for the second time
Output power (8W) when playing current audio signals is less than high-frequency band under 101 current volume of power amplifier and corresponds to first power valve
It is worth (10W), the display brightness to control LED is most dark, i.e. LED becomes most dark state from most bright state, i.e. the brightness of LED is in
Variation is showed, i.e. LED shows flicker state.And so on, when the output power of front and back double sampling to power amplifier 101 is different
When, LED just will present different brightness, so that LED shows different flicker states.
In the present embodiment, above-mentioned data processing module 102 is dsp chip；Above-mentioned control module 103 is microcontroller.This reality
It applies in example, microcontroller is 10ms, i.e., the sampling of microcontroller in the present embodiment to the sampling period of the output power of above-mentioned power amplifier 101
Frequency is 100HZ (f=1/T=1/10ms=100HZ).
In the present embodiment, above-mentioned LED display circuit 104 includes operating voltage input terminal VCC, the first NPN triode Q1, the
Two NPN triode Q2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and LED light group 1041, wherein
LED light group 1041 includes the first LED light LED1, the second LED light LED2, third LED light LED3, the 4th LED light LED4 and the 5th
LED light LED5.In the present embodiment, the voltage of operating voltage input terminal VCC is 5V, and the resistance value of the 4th resistance R4 is 10K Ω, third
The resistance value of resistance R3 is 100 Ω.
Specifically, the first LED light LED1, the second LED light LED2, third LED light LED3, the 4th LED light LED4 and the 5th
The anode of LED light LED5 is connect with operating voltage input terminal VCC, the first LED light LED1, the second LED light LED2, the 3rd LED
The cathode of lamp LED3, the 4th LED light LED4 and the 5th LED light LED5 are connected to the first node A, and the first node A is respectively with first
The collector of the collector of NPN triode Q1 and the second NPN triode Q2 connect；The base stage of first NPN triode Q1 is through first
Resistance R1 is connect with the first I/O mouthfuls of Px1 of control module 103；The base stage of second NPN triode Q2 is through second resistance R2 and control
2nd I/O mouthfuls of Px2 connections of module 103；The emitter of first NPN triode Q1 is grounded through 3rd resistor R3；Tri- poles 2nd NPN
The emitter of pipe Q2 is through the 4th resistance R4 ground connection.
The present embodiment LED shows that the operation principle of the circuit of audible spectrum is described in detail below：If the current sound of power amplifier 101
Amount is Vol30, and the current audio signals that power amplifier 101 is played are that (i.e. the frequency of current audio signals falls within above-mentioned height to high frequency audio
In frequent segment limit), and the output power sampled for the first time when power amplifier 101 plays current audio signals is 20W, is adopted for the second time
Output power when sample plays current audio signals to power amplifier 101 is 8W, then samples power amplifier 101 for the first time and play present video
Output power (20W) when signal is more than high-frequency band under 101 current volume of power amplifier and corresponds to second power threshold (15W), this
When control module 103 the first I/0 mouthfuls of Px1 and the 2nd I/0 mouthfuls of Px2 all export high level so that the first NPN triode Q1 and
Two NPN triode Q2 are connected, and 3rd resistor R3 and the 4th resistance R4 are in parallel at this time so that and the electric current of LED light group 1041 is larger,
So that the brightness of LED light group 1041 is most bright；And due to sample for the second time power amplifier 101 play current audio signals when
Output power (8W) is less than high-frequency band under 101 current volume of power amplifier and corresponds to first power threshold (10W), at this time control module
103 the first I/0 mouthfuls of Px1 export low level, and the 2nd I/0 mouthfuls of Px2 of control module 103 export high level so that the first NPN tri-
Pole pipe Q1 cut-offs, the second NPN triode Q2 conductings.Since the resistance value (10K Ω) of the 4th resistance R4 is larger, so that LED light
The brightness of group 1041 is most dark, so that variation is presented in the brightness of LED light group 1041, i.e., so that LED light group 1041 is shown
Flicker state.And so on, if output power when sampling the broadcasting current audio signals of power amplifier 101 for the third time is 12W, i.e.,
The output power is more than high-frequency band under 101 current volume of power amplifier and corresponds to first power threshold (10W) and work as less than power amplifier 101
High-frequency band corresponds to second power threshold (15W) under preceding volume, at this time the I/0 mouthfuls of high electricity of Px1 outputs of the first of control module 103
Flat, the 2nd I/0 mouthfuls of Px2 of control module 103 export low level so that the first NPN triode Q1 is connected, the second NPN triode
Q2 ends.Since the resistance value (100 Ω) of 3rd resistor R3 is smaller, so that the brightness of LED light group 1041 is located above two
Between brightness.That is the present embodiment LED shows the circuit of audible spectrum, as long as double sampling is to power amplifier 101 before and after control module 103
Output power it is different, then LED light group 1041 just will present different brightness, so that LED light group 1041 shows difference
Flicker state.Deserve preceding audio letter when data processing module 102 (dsp chip) detects that the output power of power amplifier 101 is more than
(i.e. the selection of power detection threshold values herein is according to 101 exports audio signal institute of power amplifier to the power detection threshold values of scale belonging to number
The difference of dominant rank and choose different power detection threshold values) when, the first I/0 mouthfuls of Px1 of control module 103 export high level,
2nd I/0 mouthfuls of Px2 of control module 103 export low level so that the first NPN triode Q1 is connected, and the second NPN triode Q2 is cut
Only.Since the resistance value (100 Ω) of 3rd resistor R3 is smaller so that LED light (the first LED light LED1, the second LED light LED2,
Third LED light LED3, the 4th LED light LED4 and the 5th LED light LED5) brightness it is brighter (state 1)；
When data processing module 102 (dsp chip) detects that the output power of power amplifier 101 is less than the current audio signals institute
First I/0 mouthfuls of Px1 of the power detection threshold values of dominant rank, control module 103 export low level, the 2nd I/0 of control module 103
Mouth Px2 exports high level so that the first NPN triode Q1 is ended, the second NPN triode Q2 conductings.Due to the 4th resistance R4's
Resistance value (10K Ω) is larger, so that the brightness of LED light is dark (state 2)；
When 101 non-playing audio signal of power amplifier, the first I/0 mouthfuls of Px1 of control module 103 and the 2nd I/0 mouthfuls of Px2 are defeated
Go out high level so that the first NPN triode Q1 and the second NPN triode Q2 are connected, at this time 3rd resistor R3 and the 4th resistance
R4 is in parallel so that the electric current of LED light is larger, so that the brightness of LED light is relative to all brighter (state of both above state
3)。
In addition, it is necessary to illustrate, in the present embodiment, since the resistance value of the 4th resistance R4 (10K Ω) is much larger than third electricity
The resistance value of R3 (100 Ω) is hindered, therefore, the brightness of the brightness ratio state 1 of above-mentioned state 3 is slightly brighter, and human eye is to be difficult to differentiate between
, therefore, the present embodiment is actually that 2 rank brightness are shown.Also, the present embodiment can be by changing 3rd resistor R3 and the
The resistance value of four resistance R4, to change the overall brightness of LED light group 1041 (resistance value is smaller, and LED light group 1041LED lamps are brighter).
For power amplifier 101 during actual play music (audiorange is 20Hz~20KHz), a certain moment only has one kind
The audio signal of frequency passes through, and the frequency of the audio signal is in continually changing, so that control module 103
First I/0 mouthfuls of Px1 and the control signal of the 2nd I/0 mouthfuls of Px2 outputs change in continuous height, so that LED light group
1041 are presented different flicker states.In the present embodiment, when the audio signal that power amplifier 101 plays is supper bass, LED light group
1041 flicker faster brighter, and when the audio signal that power amplifier 101 plays is high pitch, LED light group 1041 flickers slower darker
In addition, it is necessary to which explanation, the present embodiment realize LED light group 1041 by 2 I/O mouthfuls of control module 103
Flicker state control so that LED light group 1041 can only be shown according to 3 kinds of brightness in the present embodiment, and actually answered
In, multistage brightness can be designed according to the specific requirements of user, and brightness exponent number is different, needs to use control module 103
The number of NPN triode, the number of LED light and resistance are different in I/O mouthfuls of quantity and LED display circuit 104, because
This, needs the quantity for the I/O mouths for using control module 103 and the number and LED light of NPN triode in LED display circuit 104
Number be that the brightness exponent number requirement of overall brightness requirement and the division of LED light is specifically arranged according to user.
LED provided in this embodiment shows that the circuit of audible spectrum, control module can be controlled according to the output power of power amplifier
LED light in LED display circuit processed according to preset flicker state into line flicker, when exporting different audio signals due to power amplifier,
Its output power is different, and therefore, the present embodiment LED shows that the circuit of audible spectrum can realize that LED light follows power amplifier defeated
Go out the different of audio signal to show according to different brightness and the variations of different flicker frequency progress rhythms, i.e. the present embodiment LED
Show that the circuit of audible spectrum can realize the audible spectrum display function of stereo set by LED light so that stereo set is got over
Come it is more personalized, so as to greatly expand the market of stereo set.Also, the present embodiment also have circuit structure simple and
The advantages of easily realizing.
The present invention also provides a kind of stereo set, which includes the circuit that LED shows audible spectrum, and the LED is aobvious
Show that the circuit structure of the circuit of audible spectrum can refer to above-described embodiment, details are not described herein.Naturally, due to this implementation
The stereo set of example uses the technical solution that above-mentioned LED shows the circuit of audible spectrum, therefore the stereo set is with above-mentioned
LED shows all advantageous effects of the circuit of audible spectrum.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of method that LED shows audible spectrum, which is characterized in that include the following steps：
Step S01：Maximum power value of the power amplifier under each volume is obtained, and establishes the relation table of volume and maximum power value；
Step S02：The current volume of power amplifier is obtained, and obtains the current volume information of power amplifier according to the current volume, and root
According to the relation table of volume and maximum power value described in the current volume information inquiry, it is corresponding under current volume to obtain power amplifier
Maximum power value；
Step S03：According to corresponding maximum power value under the current volume and preset LED luminance exponent number N, according to preset meter
It calculates rule and calculates a power threshold of high-frequency band corresponding (N-1) and corresponding (N-1) a work(of low frequency band under current volume
Rate threshold values；Wherein, N is the positive integer more than or equal to 2；
Step S04：Output power and the current sound when power amplifier plays current audio signals are obtained every preset time period
The frequency information of frequency signal, and according to the frequency information of the current audio signals, by the output power and the current sound
Lower corresponding (N-1) a power threshold of high-frequency band of amount is compared or will be under the output power and the current volume respectively
Corresponding (N-1) a power threshold of low frequency band is compared respectively；
Step S05：According to comparison result, the flicker state of LED is controlled.
2. the method that LED as described in claim 1 shows audible spectrum, which is characterized in that the power amplifier is under each volume
Maximum power value is output power when power amplifier plays 0dB sine waves under each volume.
3. the method that LED as described in claim 1 shows audible spectrum, which is characterized in that the frequency model of the high-frequency band
It encloses for 5KHZ-20KHZ, the frequency range of the low frequency band is 20HZ-5KHZ.
4. the method that LED as claimed in claim 3 shows audible spectrum, which is characterized in that the step S04 is specially：
Output power and the current audio signals when power amplifier plays current audio signals are obtained every preset time period
Frequency information；When the frequency of the current audio signals be more than 5KHZ and less than 20KHZ when, then by the output power with it is described
Corresponding (N-1) a power threshold of high-frequency band is compared respectively under current volume；When the frequency of the current audio signals
When more than 20HZ and less than 5KHZ, then by the output power (N-1) corresponding with low frequency band under the current volume a work(
Rate threshold values is compared respectively.
5. the method that LED as described in claim 1 shows audible spectrum, which is characterized in that the preset time period is 10ms.
6. a kind of LED shows the circuit of audible spectrum, which is characterized in that including power amplifier, data processing module, control module and
LED display circuit；Wherein,
The data processing module for obtaining maximum power value of the power amplifier under each volume, and establishes volume and maximum power
The relation table of value；And the current volume for obtaining power amplifier, and believed according to the current volume of current volume acquisition power amplifier
Breath, and according to the relation table of volume and maximum power value described in the current volume information inquiry, power amplifier is obtained in current volume
Under corresponding maximum power value；It is additionally operable to according to corresponding maximum power value under the current volume and preset LED luminance rank
Number N calculates a power threshold of high-frequency band corresponding (N-1) and low frequency band pair under current volume according to preset computation rule
(N-1) a power threshold answered, and output this to the control module；Wherein, N is the positive integer more than or equal to 2；Also,
It is additionally operable to detect output power and the present video when power amplifier plays current audio signals every preset time period
The frequency information of signal, and the frequency information of the output power and the current audio signals is exported to the control mould
Block；
The control module, for according to the frequency informations of the current audio signals, by the output power with it is described current
Corresponding (N-1) a power threshold of high-frequency band is compared or respectively by the output power and the current volume under volume
Corresponding (N-1) a power threshold of lower low frequency band is compared respectively, and exports corresponding control signal according to comparison result
To the LED display circuit；
LED display circuit, for according to the control signal, according to preset flicker state into line flicker；
The input terminal of the data processing module is connect with the power amplifier, the output end of the data processing module and the control
The sampling input terminal of module connects；The control output end of the control module is connect with the LED display circuit.
7. LED as claimed in claim 6 shows the circuit of audible spectrum, which is characterized in that the sampling frequency of the control module
Rate is 100HZ.
8. LED as claimed in claim 7 shows the circuit of audible spectrum, which is characterized in that the data processing module is DSP
Chip；The control module is microcontroller.
9. LED as claimed in claim 8 shows the circuit of audible spectrum, which is characterized in that the LED display circuit includes work
Make voltage input end, the first NPN triode, the second NPN triode, first resistor, second resistance, 3rd resistor, the 4th resistance
And LED light group；Wherein,
The anode of the LED light group is connect with the operating voltage input terminal, and the cathode of the LED light group is connected to the first knot
Point, first node are connect with the collector of the collector of the first NPN triode and the second NPN triode respectively；First NPN
The base stage of triode through first resistor and the control module the first I/O mouthfuls connect, the emitter of the first NPN triode is through
Three resistance eutral groundings；The base stage of second NPN triode through second resistance and the control module the 2nd I/O mouthfuls connect, the 2nd NPN
The emitter of triode is through the 4th resistance eutral grounding.
10. a kind of stereo set, which is characterized in that the stereo set includes the LED described in any one of claim 6 to 9
Show the circuit of audible spectrum.
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| CN107306462A (en) * | 2016-04-19 | 2017-10-31 | 齐鲁工业大学 | A kind of LED battle array Audio presentation device and its Fourier modes fuzzy control method |
| CN106170108B (en) * | 2016-09-07 | 2021-05-04 | 合肥中感微电子有限公司 | Earphone device with decibel reminding mode |
| CN107182159A (en) * | 2017-06-20 | 2017-09-19 | 上海展扬通信技术有限公司 | A kind of control method and control system of intelligent terminal flash lamp |
| CN109754824A (en) * | 2017-11-08 | 2019-05-14 | 国民技术股份有限公司 | A kind of audio file play method and system, tone playing equipment and luminaire |
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