CN105451128A - LED audio spectrum display method, circuit, and sound equipment - Google Patents
LED audio spectrum display method, circuit, and sound equipment Download PDFInfo
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- CN105451128A CN105451128A CN201410441498.5A CN201410441498A CN105451128A CN 105451128 A CN105451128 A CN 105451128A CN 201410441498 A CN201410441498 A CN 201410441498A CN 105451128 A CN105451128 A CN 105451128A
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Abstract
The invention discloses an LED audio spectrum display method. The method includes the steps of establishing a relational table between a volume and a maximum power value; obtaining a current volume of a power amplifier, querying the relational table between the volume and the maximum power value based on the current volume, and obtaining a maximum power value of the power amplifier at the volume; setting, based on the maximum power value corresponding to the volume and a preset LED brightness order N, (N-1) power threshold values corresponding to a high frequency band under the volume and (N-1) power threshold values corresponding to a low frequency band; obtaining the output power of the power amplifier and frequency information of a current audio signal every preset period of time, and comparing the output power of the power amplifier with the (N-1) power threshold values corresponding to the high frequency band under the volume or the (N-1) power threshold values corresponding to the low frequency band based on the frequency information; and controlling the flashing state of an LED according to the comparison result. The invention can achieve the audio spectrum display function of sound equipment by an LED lamp.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of LED shows the method for audible spectrum, circuit and stereo set.
Background technology
At present, the kind of stereo set gets more and more, and the function of stereo set is also more and more personalized.But, in existing numerous stereo set, currently also there is not the stereo set being realized audible spectrum Presentation Function by LED.
Summary of the invention
Main purpose of the present invention is to provide a kind of method that can be realized the LED display audible spectrum of stereo set audible spectrum Presentation Function by LED.
For achieving the above object, the invention provides a kind of method that LED shows audible spectrum, the method that described LED shows audible spectrum comprises the following steps:
Step S01: obtain the maximum power value of power amplifier under each volume, and set up the relation table of volume and maximum power value;
Step S02: the current volume obtaining power amplifier, and the current volume information of power amplifier is obtained according to described current volume, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier is corresponding under current volume;
Step S03: according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculates (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule; Wherein, N be more than or equal to 2 positive integer;
Step S04: the power output when preset time period obtains power amplifier broadcasting current audio signals and the frequency information of described current audio signals, and according to the frequency information of described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively;
Step S05: according to comparative result, the blink states of control LED.
Preferably, the maximum power value of described power amplifier under each volume be power amplifier play under each volume 0dB sinusoidal wave time power output.
Preferably, the frequency range of described high-frequency band is 5KHZ-20KHZ, and the frequency range of described low frequency frequency range is 20HZ-5KHZ.
Preferably, described step S04 is specially:
Power output when preset time period obtains power amplifier broadcasting current audio signals and the frequency information of described current audio signals; When the frequency of described current audio signals is greater than 5KHZ and is less than 20KHZ, then (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output is compared respectively; When the frequency of described current audio signals is greater than 20HZ and is less than 5KHZ, then (N-1) the individual power threshold described power output and described current volume being bent down frequent section corresponding compares respectively.
Preferably, described preset time period is 10ms.
In addition, for achieving the above object, the present invention also provides a kind of LED to show the circuit of audible spectrum, and the circuit that described LED shows audible spectrum comprises power amplifier, data processing module, control module and LED display circuit; Wherein,
Described data processing module, for obtaining the maximum power value of power amplifier under each volume, and sets up the relation table of volume and maximum power value; And for obtaining the current volume of power amplifier, and the current volume information of power amplifier is obtained according to described current volume, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier is corresponding under current volume; Also for according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculate (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule, and exported to described control module; Wherein, N be more than or equal to 2 positive integer; And, also for detecting power output when described power amplifier plays current audio signals and the frequency information of described current audio signals every preset time period, and export the frequency information of described power output and described current audio signals to described control module;
Described control module, for the frequency information according to described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively, and controls signal to described LED display circuit accordingly according to comparative result output;
LED display circuit, for according to described control signal, glimmers according to the blink states preset;
The input of described data processing module is connected with described power amplifier, and the output of described data processing module is connected with the sampling input of described control module; The control output end of described control module is connected with described LED display circuit.
Preferably, the sample frequency of described control module is 50HZ100HZ.
Preferably, described data processing module is dsp chip; Described control module is single-chip microcomputer.
Preferably, described LED display circuit comprises operating voltage input, a NPN triode, the 2nd NPN triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance and LED group; Wherein,
The anode of described LED group is all connected with described operating voltage input, and the negative electrode of described LED group is connected to the first node, and described first node is connected with the collector electrode of a NPN triode and the collector electrode of the 2nd NPN triode respectively; The base stage of the one NPN triode is connected with an I/O mouth of described control module through the first resistance, and the emitter of a NPN triode is through the 3rd grounding through resistance; The base stage of the 2nd NPN triode is connected with the 2nd I/O mouth of described control module through the second resistance, and the emitter of the 2nd NPN triode is through the 4th grounding through resistance.
In addition, for achieving the above object, the present invention also provides a kind of stereo set, and described stereo set comprises the circuit that LED shows audible spectrum, and the circuit that described LED shows audible spectrum comprises power amplifier, data processing module, control module and LED display circuit; Wherein,
Described data processing module, for obtaining the maximum power value of power amplifier under each volume, and sets up the relation table of volume and maximum power value; And for obtaining the current volume of power amplifier, and the current volume information of power amplifier is obtained according to described current volume, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier is corresponding under current volume; Also for according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculate (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule; Wherein, N be more than or equal to 2 positive integer; And, also for detecting power output when described power amplifier plays current audio signals and the frequency information of described current audio signals every preset time period, and export the frequency information of described power output and described current audio signals to described control module;
Described control module, for the frequency information according to described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively, and controls signal to described LED display circuit accordingly according to comparative result output;
LED display circuit, for according to described control signal, glimmers according to the blink states preset;
The input of described data processing module is connected with described power amplifier, and the output of described data processing module is connected with the sampling input of described control module; The control output end of described control module is connected with described LED display circuit.
LED provided by the invention shows the method for audible spectrum, comprises step S01: first, obtains the maximum power value of power amplifier under each volume, and sets up the relation table of volume and maximum power value; Step S02: then, obtain the current volume of power amplifier, and obtain the current volume information of power amplifier according to described current volume, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value of power amplifier correspondence under current volume; Step S03: then, according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculate (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule; Wherein, N be more than or equal to 2 positive integer; Step S04: then, the power output when preset time period obtains power amplifier broadcasting current audio signals and the frequency information of described current audio signals; And according to the frequency information of described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively; Step S05: last, according to comparative result, the blink states of control LED.The method of this LED display audible spectrum provided by the invention can realize the audible spectrum Presentation Function of stereo set by LED, make stereo set more and more personalized, thus greatly can expand the market of stereo set.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that LED of the present invention shows method one embodiment of audible spectrum;
Fig. 2 is the electrical block diagram that LED of the present invention shows circuit one embodiment of audible spectrum.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of method that LED shows audible spectrum.
It is the schematic flow sheet of method one embodiment of LED of the present invention display audible spectrum with reference to Fig. 1, Fig. 1.
In the present embodiment, the method that this LED shows audible spectrum comprises the following steps:
Step S01: obtain the maximum power value of power amplifier under each volume, and set up the relation table of volume and maximum power value;
Particularly, the maximum power value of power amplifier under each volume is the power output of power amplifier when playing 0dB sine wave (i.e. unpressed signal source) under each volume, namely the present embodiment LED shows the method for audible spectrum, first be obtain power amplifier play under each volume 0dB sinusoidal wave time power output, and set up the relation table of volume and maximum power value.In the present embodiment, if power amplifier has ten single order volumes, be respectively Vol30, Vol31, Vol32, Vol33, Vol34, Vol35, Vol36, Vol37, Vol38, Vol39 and Vol40, the corresponding dB value of every rank volume, the dB value that Vol30 is corresponding is 0dB, the dB value that Vol31 is corresponding is 1dB, the dB value that Vol32 is corresponding is 2dB, the dB value that Vol33 is corresponding is 3dB, the dB value that Vol34 is corresponding is 4dB, the dB value that Vol35 is corresponding is 5dB, the dB value that Vol36 is corresponding is 6dB, the dB value that Vol37 is corresponding is 7dB, the dB value that Vol38 is corresponding is 8dB, the dB value that Vol39 is corresponding is 9dB, the dB value that Vol40 is corresponding is 10dB, namely in the present embodiment, the volume set up and the relation table of maximum power value as shown in table 1.
Table 1
| Volume | Vol30 | Vol31 | Vol32 | Vol33 | Vol34 | Vol35 | Vol36 | Vol37 | Vol38 | Vol39 | Vol40 |
| DB value | 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 obtaining power amplifier, and the current volume information of power amplifier is obtained according to described current volume, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier is corresponding under current volume;
Particularly, the present embodiment LED shows the method for audible spectrum, when after the relation table establishing above-mentioned volume and maximum power value, then obtain the dB value that the current volume of power amplifier is corresponding, and the dB value corresponding according to described current volume inquires about the relation table of above-mentioned volume and maximum power value, namely inquire about above-mentioned table 1, obtain the maximum power value that power amplifier is corresponding under current volume.Such as, if power amplifier current volume is Vol30, then the current volume information of the power amplifier got is 0dB, and by inquiring about above-mentioned table 1, can get the power amplifier maximum power value that (Vol30) is corresponding under current volume is 30W.
Step S03: according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculates (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule; Wherein, N be more than or equal to 2 positive integer;
Particularly, if LED luminance exponent number N value is larger, then the effect of LED display audible spectrum is better, because brightness exponent number is more, then can more close to the sense organ of people, and the brightness change of LED is play music along with power amplifier and changes to allow people feel.The present embodiment with LED luminance exponent number N=3 (namely LED shows 3 kinds of different brightness, is respectively the brightest, brighter and darker three kinds of brightness) for example is described the method that this LED shows audible spectrum.
Because the susceptibility of people's ear to sound increases gradually from bass and high frequency audio, namely under Same Efficieney level, the sound that high frequency audio sounds is smaller, therefore, in the present embodiment, when setting power threshold values, under same volume, the power threshold that the power threshold of high-frequency band bends down frequent section relative to this volume will set more greatly, and namely in the present embodiment, the power threshold that high-frequency band is corresponding and power threshold corresponding to low frequency frequency range are separated.In the present embodiment, due to LED luminance exponent number N=3, therefore, 2 power threshold that 2 power threshold that high-frequency band is corresponding under current volume and current volume bend down frequent section correspondence are needed to set.
In the present embodiment, under current volume, the preset computation rule of 2 power threshold that high-frequency band is corresponding is respectively A1=B × C1% and A2=B × C2%, wherein, A1 is first power threshold that under current volume, high-frequency band is corresponding, A2 is second power threshold that under current volume, high-frequency band is corresponding, B is for the maximum power value of power amplifier correspondence under current volume is (according to step S02, i.e. B=30W), C1% and C2% be all be less than 1 percent value (due to music on the market all with-6dB go compression, namely 0dB is less than, therefore each power threshold in the present embodiment all will be multiplied by a percentage, power threshold is allowed to be less than maximum power value under this volume).Such as, the current volume of power amplifier is Vol30, if first power threshold A1=10W, i.e. 10W=30W × C1%, then C1%=1/3 that under this volume, high-frequency band is corresponding; If second power threshold A2=15W, i.e. 15W=30W × C2%, then C2%=0.5 that under this volume, high-frequency band is corresponding.
In the present embodiment, the preset computation rule that current volume bends down 2 power threshold of frequent section correspondence is respectively A3=B × C3% and A4=B × C4%, wherein, A3 is first power threshold that current volume bends down frequent section correspondence, A4 is second power threshold that current volume bends down frequent section correspondence, B is the maximum power value (according to step S02, i.e. B=30W) that power amplifier is corresponding under current volume, C3% and C4% be all be less than 1 percent value.Such as, when the current volume of power amplifier is Vol30, if this volume bends down first power threshold A3=6W, i.e. 6W=30W × C3%, then C3%=0.2 of frequent section correspondence; If this volume bends down second power threshold A2=10W, i.e. 10W=30W × C4%, then C4%=1/3 of frequent section correspondence.
In the present embodiment, the frequency range of above-mentioned high-frequency band is 5KHZ-20KHZ (treble portion of corresponding music), the frequency range of above-mentioned low frequency frequency range is 20HZ-5KHZ (bass part of corresponding music), namely the present embodiment to be the power threshold of 5KHZ-20KHZ and frequency range by frequency range be power threshold of 20HZ-5KHZ separately, namely, in the present embodiment, LED carries out different blink states to high pitch and bass.
Step S04: the power output when preset time period obtains power amplifier broadcasting current audio signals and the frequency information of described current audio signals; And according to the frequency information of described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively;
Particularly, in the present embodiment, above-mentioned preset time period is 10ms, namely the present embodiment obtains the frequency information of power output when power amplifier plays current audio signals and described current audio signals every the 10ms time, when the frequency of described current audio signals is greater than 5KHZ and is less than 20KHZ (namely falling within the scope of above-mentioned high-frequency band), then above-mentioned 2 power threshold (10W and 15W) corresponding with high-frequency band under power amplifier current volume for the power output of the power amplifier got are compared respectively; (fall in above-mentioned low frequency band limits) when the frequency of described current audio signals is greater than 20HZ and is less than 5KHZ, then above-mentioned 2 power threshold (6W and the 10W) power output of the power amplifier got and power amplifier current volume being bent down frequent section corresponding compare respectively.
Step S05: according to comparative result, the blink states of control LED.
Particularly, if the current volume of power amplifier is Vol30, the current audio signals that power amplifier is play is high frequency audio (namely the frequency of current audio signals falls within the scope of above-mentioned high-frequency band), and power output when sampling power amplifier broadcasting current audio signals is for the first time 20W, power output when sampling power amplifier broadcasting current audio signals is for the second time 8W, then the power output (20W) that samples when power amplifier plays current audio signals is greater than corresponding second power threshold (15W) of high-frequency band under power amplifier current volume first time, thus the display brightness of control LED is the brightest, and the power output (8W) that second time samples when power amplifier plays current audio signals is less than corresponding first power threshold (10W) of high-frequency band under power amplifier current volume, thus the display brightness of control LED is the darkest, thus make the brightness of LED from the brightest become the darkest, namely the brightness of LED presents change, namely makes LED show blink states.By that analogy, when front and back double sampling is different to the power output of power amplifier, LED will present different brightness, thus makes LED show different blink states.
The present embodiment is that 3 of LED kinds of brightness are provided with 2 power threshold under each volume, and, the separately setting of high frequency audio under each volume and the power threshold of bass, when the power output of power amplifier exceedes corresponding power threshold, LED just glimmers accordingly.If the brightness kind of LED is more, then can make more more personalized flicker effect.
The LED that the present embodiment provides shows the method for audible spectrum, first, obtains the maximum power value of power amplifier under each volume, and sets up the relation table of volume and maximum power value; Then, obtain the current volume information of power amplifier, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value of power amplifier correspondence under current volume; Then, according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculate (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule; Wherein, N be more than or equal to 2 positive integer; Then, the power output when preset time period obtains power amplifier broadcasting current audio signals and the frequency information of described current audio signals; And according to the frequency information of described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively; Finally, according to comparative result, the blink states of control LED.The method of this LED display audible spectrum that the present embodiment provides can realize the audible spectrum Presentation Function of stereo set by LED, make stereo set more and more personalized, thus greatly can expand the market of stereo set.
The present invention also provides a kind of LED to show the circuit of audible spectrum.
It is the electrical block diagram of circuit one embodiment of LED of the present invention display audible spectrum with reference to Fig. 2, Fig. 2.
In the present embodiment, the circuit that this LED shows audible spectrum comprises power amplifier 101, data processing module 102, control module 103 and LED display circuit 104.
Particularly, the input of data processing module 102 is connected with power amplifier 101, and the output of data processing module 102 is connected with the sampling input of control module 103; The control output end of control module 103 is connected with LED display circuit 104.
Wherein, above-mentioned data processing module 102, for obtaining the maximum power value of power amplifier 101 under each volume, and sets up the relation table of volume and maximum power value; And for obtaining the current volume information of power amplifier 101, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier 101 is corresponding under current volume; Also for according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculate (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule, and export (N-1) individual power threshold corresponding for high-frequency band under this current volume and (N-1) individual power threshold corresponding to low frequency frequency range to described control module 103; Wherein, N be more than or equal to 2 positive integer; And, also for detecting the frequency information of power output when described power amplifier 101 plays current audio signals and described current audio signals every preset time period, and export the frequency information of described power output and described current audio signals to described control module 103;
Particularly, in the present embodiment, the maximum power value of power amplifier 101 under each volume is the power output of power amplifier 101 when playing 0dB sine wave (i.e. unpressed signal source) under each volume, data processing module 102 when getting the maximum power value of power amplifier 101 under each volume, then sets up the relation table of volume and maximum power value.In the present embodiment, if power amplifier 101 has ten single order volumes, be respectively Vol30, Vol31, Vol32, Vol33, Vol34, Vol35, Vol36, Vol37, Vol38, Vol39 and Vol40, the corresponding dB value of every rank volume, the dB value that Vol30 is corresponding is 0dB, the dB value that Vol31 is corresponding is 1dB, the dB value that Vol32 is corresponding is 2dB, the dB value that Vol33 is corresponding is 3dB, the dB value that Vol34 is corresponding is 4dB, the dB value that Vol35 is corresponding is 5dB, the dB value that Vol36 is corresponding is 6dB, the dB value that Vol37 is corresponding is 7dB, the dB value that Vol38 is corresponding is 8dB, the dB value that Vol39 is corresponding is 9dB, the dB value that Vol40 is corresponding is 10dB, namely in the present embodiment, the relation table of the volume that data processing module 102 is set up and maximum power value is as shown in table 1.
Table 1
| Volume | Vol30 | Vol31 | Vol32 | Vol33 | Vol34 | Vol35 | Vol36 | Vol37 | Vol38 | Vol39 | Vol40 |
| DB value | 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 is after the relation table setting up volume and maximum power value, then obtain the current volume information of power amplifier 101, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier 101 is corresponding under current volume.Such as, if power amplifier 101 current volume is Vol30, the current volume information of power amplifier 101 that then data processing module 102 gets is 0dB, then data processing module 102 is again by the above-mentioned table 1 of inquiry, and can get power amplifier 101 maximum power value that (Vol30) is corresponding under current volume is 30W.
Data processing module 102 is after getting power amplifier 101 maximum power value (30W) that (Vol30) is corresponding under current volume, then according to maximum power value (30W) corresponding under described current volume and the LED luminance exponent number N that presets, calculate (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule; Wherein, N be more than or equal to 2 positive integer.Particularly, LED luminance exponent number N value is larger, then to show the effect of audible spectrum better for LED because brightness exponent number is more, then can more close to the sense organ of people, allow people feel the brightness of LED change along with power amplifier 101 play music and change.The present embodiment is with LED luminance exponent number N=3 (namely LED shows 3 kinds of different brightness, is respectively the brightest, brighter and darker three kinds of brightness).Again because the susceptibility of people's ear to sound increases gradually from bass and high frequency audio, namely under Same Efficieney level, the sound that high frequency audio sounds is smaller, therefore, in the present embodiment, when setting power threshold values, under same volume, the power threshold that the power threshold of high-frequency band bends down frequent section relative to this volume will set more greatly, and namely in the present embodiment, the power threshold that high-frequency band is corresponding and power threshold corresponding to low frequency frequency range are separated.In the present embodiment, due to LED luminance exponent number N=3, therefore, data processing module 102 needs to set 2 power threshold that high-frequency band is corresponding under current volume 2 power threshold and current volume bend down frequent section correspondence.
In the present embodiment, under current volume, the preset computation rule of 2 power threshold that high-frequency band is corresponding is respectively A1=B × C1% and A2=B × C2%, wherein, A1 is first power threshold that under current volume, high-frequency band is corresponding, A2 is second power threshold that under current volume, high-frequency band is corresponding, B is for the maximum power value of power amplifier 101 correspondence under current volume is (according to step S02, i.e. B=30W), C1% and C2% be all be less than 1 percent value (due to music on the market all with-6dB go compression, namely 0dB is less than, therefore each power threshold in the present embodiment all will be multiplied by a percentage, power threshold is allowed to be less than maximum power value under this volume).Such as, the current volume of power amplifier 101 is Vol30, if first power threshold A1=10W, i.e. 10W=30W × C1%, then C1%=1/3 that under this volume, high-frequency band is corresponding; If second power threshold A2=15W, i.e. 15W=30W × C2%, then C2%=0.5 that under this volume, high-frequency band is corresponding.
In the present embodiment, the preset computation rule that current volume bends down 2 power threshold of frequent section correspondence is respectively A3=B × C3% and A4=B × C4%, wherein, A3 is first power threshold that current volume bends down frequent section correspondence, A4 is second power threshold that current volume bends down frequent section correspondence, B is the maximum power value (according to step S02, i.e. B=30W) that power amplifier 101 is corresponding under current volume, C3% and C4% be all be less than 1 percent value.Such as, when the current volume of power amplifier 101 is Vol30, if this volume bends down first power threshold A3=6W, i.e. 6W=30W × C3%, then C3%=0.2 of frequent section correspondence; If this volume bends down second power threshold A2=10W, i.e. 10W=30W × C4%, then C4%=1/3 of frequent section correspondence.
In the present embodiment, the frequency range of above-mentioned high-frequency band is 5KHZ-20KHZ (treble portion of corresponding music), the frequency range of above-mentioned low frequency frequency range is 20HZ-5KHZ (bass part of corresponding music), namely the present embodiment to be the power threshold of 5KHZ-20KHZ and frequency range by frequency range be power threshold of 20HZ-5KHZ separately, namely, in the present embodiment, LED carries out different blink states to high pitch and bass.
Data processing module 102 under setting current volume after 2 power threshold (i.e. above-mentioned A1 and A2) corresponding to high-frequency band and 2 power threshold (i.e. above-mentioned A3 and A4) corresponding to low frequency frequency range, then exports corresponding for high-frequency band under current volume 2 power threshold (i.e. above-mentioned A1 and A2) and 2 power threshold (i.e. above-mentioned A3 and A4) corresponding to low frequency frequency range to control module 103.
And, data processing module 102 is under setting setting current volume after 2 power threshold (i.e. above-mentioned A1 and A2) corresponding to high-frequency band and 2 power threshold (i.e. above-mentioned A3 and A4) corresponding to low frequency frequency range, then detect the frequency information of power output when described power amplifier 101 plays current audio signals and described current audio signals every preset time period, and export the frequency information of described power output and described current audio signals to described control module 103.
Above-mentioned control module 103, for the frequency information according to described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively, and controls signal to described LED display circuit 104 accordingly according to comparative result output;
Particularly, in the present embodiment, when the frequency of described current audio signals is greater than 5KHZ and is less than 20KHZ (namely falling within the scope of above-mentioned high-frequency band), then above-mentioned 2 power threshold (10W and 15W) corresponding with high-frequency band under power amplifier 101 current volume of power output when power amplifier 101 is play current audio signals by control module 103 compare respectively; (fall in above-mentioned low frequency band limits) when the frequency of described current audio signals is greater than 20HZ and is less than 5KHZ, power output when then power amplifier 101 is play current audio signals by control module 103 compares respectively with above-mentioned 2 power threshold (6W and 10W) that power amplifier 101 current volume bends down frequent section corresponding, and exports according to comparative result and control signal to described LED display circuit 104 accordingly.
Above-mentioned LED display circuit 104, for the control signal exported according to control module 103, glimmers according to the blink states preset.
Particularly, if the current volume of power amplifier 101 is Vol30, the current audio signals that power amplifier 101 is play is high frequency audio (namely the frequency of current audio signals falls within the scope of above-mentioned high-frequency band), and the power output that first time samples when power amplifier 101 plays current audio signals is 20W, the power output that second time samples when power amplifier 101 plays current audio signals is 8W, then the power output (20W) sampled when power amplifier 101 plays current audio signals is greater than corresponding second power threshold (15W) of high-frequency band under power amplifier 101 current volume first time, thus the display brightness of control LED is the brightest, the second time power output (8W) sampled when power amplifier 101 plays current audio signals is less than corresponding first power threshold (10W) of high-frequency band under power amplifier 101 current volume, thus the display brightness of control LED is the darkest, namely LED becomes the darkest state from the brightest state, namely the brightness of LED presents change, and namely LED shows blink states.By that analogy, when front and back double sampling is different to the power output of power amplifier 101, LED will present different brightness, thus makes LED show different blink states.
In the present embodiment, above-mentioned data processing module 102 is dsp chip; Above-mentioned control module 103 is single-chip microcomputer.In the present embodiment, the sampling period of single-chip microcomputer to the power output of above-mentioned power amplifier 101 is 10ms, and namely in the present embodiment, the sample frequency of single-chip microcomputer is 100HZ (f=1/T=1/10ms=100HZ).
In the present embodiment, above-mentioned LED display circuit 104 comprises operating voltage input VCC, a NPN triode Q1, the 2nd NPN triode Q2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and LED group 1041, and wherein LED group 1041 comprises the first LED LED1, the second LED LED2, the 3rd LED LED3, the 4th LED LED4 and the 5th LED LED5.In the present embodiment, the voltage of operating voltage input VCC is 5V, and the resistance of the 4th resistance R4 is 10K Ω, and the resistance of the 3rd resistance R3 is 100 Ω.
Particularly, the anode of the first LED LED1, the second LED LED2, the 3rd LED LED3, the 4th LED LED4 and the 5th LED LED5 is all connected with operating voltage input VCC, the negative electrode of the first LED LED1, the second LED LED2, the 3rd LED LED3, the 4th LED LED4 and the 5th LED LED5 is connected to the first node A, and the first node A is connected with the collector electrode of a NPN triode Q1 and the collector electrode of the 2nd NPN triode Q2 respectively; The base stage of the one NPN triode Q1 is connected with an I/O mouth Px1 of control module 103 through the first resistance R1; The base stage of the 2nd NPN triode Q2 is connected with the 2nd I/O mouth Px2 of control module 103 through the second resistance R2; The emitter of the one NPN triode Q1 is through the 3rd resistance R3 ground connection; The emitter of the 2nd NPN triode Q2 is through the 4th resistance R4 ground connection.
The operation principle that the present embodiment LED shows the circuit of audible spectrum specifically describes as follows: if the current volume of power amplifier 101 is Vol30, the current audio signals that power amplifier 101 is play is high frequency audio (namely the frequency of current audio signals falls within the scope of above-mentioned high-frequency band), and the power output that first time samples when power amplifier 101 plays current audio signals is 20W, the power output that second time samples when power amplifier 101 plays current audio signals is 8W, then the power output (20W) sampled when power amplifier 101 plays current audio signals is greater than corresponding second power threshold (15W) of high-frequency band under power amplifier 101 current volume first time, now an I/0 mouth Px1 of control module 103 and the 2nd I/0 mouth Px2 exports high level, make a NPN triode Q1 and the 2nd NPN triode Q2 all conductings, now the 3rd resistance R3 and the 4th resistance R4 is in parallel, make the electric current of LED group 1041 larger, thus make the brightness of LED group 1041 for the brightest, and be less than corresponding first power threshold (10W) of high-frequency band under power amplifier 101 current volume due to the second time power output (8W) sampled when power amplifier 101 plays current audio signals, a now I/0 mouth Px1 output low level of control module 103,2nd I/0 mouth Px2 of control module 103 exports high level, one NPN triode Q1 is ended, the 2nd NPN triode Q2 conducting.Because the resistance (10K Ω) of the 4th resistance R4 is comparatively large, thus make the brightness of LED group 1041 for the darkest, thus make the brightness of LED group 1041 present change, namely make LED group 1041 show blink states.By that analogy, if when third time, the power output sampled when power amplifier 101 plays current audio signals was 12W, namely this power output is greater than corresponding first power threshold (10W) of high-frequency band under power amplifier 101 current volume and corresponding second power threshold (15W) of high-frequency band under being less than power amplifier 101 current volume, now an I/0 mouth Px1 of control module 103 exports high level, 2nd I/0 mouth Px2 output low level of control module 103, make a NPN triode Q1 conducting, the 2nd NPN triode Q2 ends.Because the resistance (100 Ω) of the 3rd resistance R3 is less, thus make the brightness of LED group 1041 between above-mentioned two kinds of brightness.Namely the present embodiment LED shows the circuit of audible spectrum, as long as double sampling is different to the power output of power amplifier 101 before and after control module 103, then LED group 1041 will present different brightness, thus makes LED group 1041 show different blink states.When data processing module 102 (dsp chip) detect the power output of power amplifier 101 be greater than scale belonging to this current audio signals power detection threshold values (namely herein power detection threshold values choose be scale belonging to power amplifier 101 output audio signal difference and choose different power detection threshold values) time, one I/0 mouth Px1 of control module 103 exports high level, 2nd I/0 mouth Px2 output low level of control module 103, make a NPN triode Q1 conducting, the 2nd NPN triode Q2 ends.Because the resistance (100 Ω) of the 3rd resistance R3 is less, thus make the brightness brighter (state 1) of LED (the first LED LED1, the second LED LED2, the 3rd LED LED3, the 4th LED LED4 and the 5th LED LED5);
When data processing module 102 (dsp chip) detects that the power output of power amplifier 101 is less than the power detection threshold values of scale belonging to this current audio signals, one I/0 mouth Px1 output low level of control module 103,2nd I/0 mouth Px2 of control module 103 exports high level, one NPN triode Q1 is ended, the 2nd NPN triode Q2 conducting.Because the resistance (10K Ω) of the 4th resistance R4 is comparatively large, thus make the brightness of LED comparatively dark (state 2);
When power amplifier 101 non-playing audio signal, one I/0 mouth Px1 and the 2nd I/0 mouth Px2 of control module 103 export high level, make a NPN triode Q1 and the 2nd NPN triode Q2 all conductings, now the 3rd resistance R3 and the 4th resistance R4 is in parallel, the electric current making LED is comparatively large, thus makes the brightness of LED relative to two states all brighter (state 3) above.
In addition, it should be noted that, in the present embodiment, because the resistance of the 4th resistance R4 (10K Ω) is much larger than the resistance of the 3rd resistance R3 (100 Ω), therefore, the brightness of the brightness ratio state 1 of above-mentioned state 3 is brighter a little, and human eye is difficult to distinguish, therefore, in fact the present embodiment is exactly 2 rank brightness displays.Further, the present embodiment by the resistance of change the 3rd resistance R3 and the 4th resistance R4, can change the overall brightness (resistance is less, and LED group 1041LED lamp is brighter) of LED group 1041.
Power amplifier 101 is in the process of actual play music (audiorange is 20Hz ~ 20KHz), the a certain moment only has a kind of audio signal of frequency to pass through, and the frequency of this audio signal is in constantly change, thus the control signal that an I/0 mouth Px1 of control module 103 and the 2nd I/0 mouth Px2 is exported is in constantly height change, thus LED group 1041 is made to present different blink states.In the present embodiment, when the audio signal that power amplifier 101 is play is supper bass, LED group 1041 is glimmered faster brighter, and when the audio signal that power amplifier 101 is play is high pitch, LED group 1041 is glimmered slower darker
In addition, it should be noted that, the blink states that the present embodiment realizes LED group 1041 by 2 I/O mouths of control module 103 controls, LED group 1041 in the present embodiment only can be shown according to 3 kinds of brightness, and in actual applications, multistage brightness can be designed according to the real needs of user, and brightness exponent number is different, need the number of NPN triode in the quantity of the I/O mouth using control module 103 and LED display circuit 104, the number of LED and resistance are different, therefore, the number of NPN triode and the number of LED in the quantity of the I/O mouth using control module 103 and LED display circuit 104 is needed to be that the brightness exponent number requiring according to the overall brightness of user to LED and divide requires to carry out concrete setting.
The LED that the present embodiment provides shows the circuit of audible spectrum, control module can according to the power output of power amplifier, the LED controlled in LED display circuit is glimmered according to the blink states preset, during due to power amplifier output different audio signals, its power output is different, therefore, the present embodiment LED shows the circuit of audible spectrum and can realize the difference that LED follows power amplifier output audio signal and carry out rhythmic change display according to different brightness and different flicker frequency, namely the circuit of the present embodiment LED display audible spectrum can realize the audible spectrum Presentation Function of stereo set by LED, make stereo set more and more personalized, thus greatly can expand the market of stereo set.Further, the present embodiment also has circuit structure advantage that is simple and that easily realize.
The present invention also provides a kind of stereo set, and this stereo set comprises the circuit that LED shows audible spectrum, and the circuit structure that this LED shows the circuit of audible spectrum can refer to above-described embodiment, does not repeat them here.Naturally, the stereo set due to the present embodiment have employed the technical scheme of circuit that above-mentioned LED shows audible spectrum, and therefore this stereo set has above-mentioned LED and shows all beneficial effects of the circuit of audible spectrum.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. LED shows a method for audible spectrum, it is characterized in that, comprises the following steps:
Step S01: obtain the maximum power value of power amplifier under each volume, and set up the relation table of volume and maximum power value;
Step S02: the current volume obtaining power amplifier, and the current volume information of power amplifier is obtained according to described current volume, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier is corresponding under current volume;
Step S03: according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculates (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule; Wherein, N be more than or equal to 2 positive integer;
Step S04: the power output when preset time period obtains power amplifier broadcasting current audio signals and the frequency information of described current audio signals; And according to the frequency information of described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively;
Step S05: according to comparative result, the blink states of control LED.
2. LED as claimed in claim 1 shows the method for audible spectrum, it is characterized in that, the maximum power value of described power amplifier under each volume be power amplifier play under each volume 0dB sinusoidal wave time power output.
3. LED as claimed in claim 1 shows the method for audible spectrum, and it is characterized in that, the frequency range of described high-frequency band is 5KHZ-20KHZ, and the frequency range of described low frequency frequency range is 20HZ-5KHZ.
4. LED as claimed in claim 3 shows the method for audible spectrum, and it is characterized in that, described step S04 is specially:
Power output when preset time period obtains power amplifier broadcasting current audio signals and the frequency information of described current audio signals; When the frequency of described current audio signals is greater than 5KHZ and is less than 20KHZ, then (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output is compared respectively; When the frequency of described current audio signals is greater than 20HZ and is less than 5KHZ, then (N-1) the individual power threshold described power output and described current volume being bent down frequent section corresponding compares respectively.
5. LED as claimed in claim 1 shows the method for audible spectrum, and it is characterized in that, described preset time period is 10ms.
6. LED shows a circuit for audible spectrum, it is characterized in that, comprises power amplifier, data processing module, control module and LED display circuit; Wherein,
Described data processing module, for obtaining the maximum power value of power amplifier under each volume, and sets up the relation table of volume and maximum power value; And for obtaining the current volume of power amplifier, and the current volume information of power amplifier is obtained according to described current volume, and according to described current volume information inquiry the relation table of volume and maximum power value, obtain the maximum power value that power amplifier is corresponding under current volume; Also for according to maximum power value corresponding under described current volume and default LED luminance exponent number N, calculate (N-1) individual power threshold corresponding to high-frequency band under current volume and (N-1) individual power threshold corresponding to low frequency frequency range according to preset computation rule, and exported to described control module; Wherein, N be more than or equal to 2 positive integer; And, also for detecting power output when described power amplifier plays current audio signals and the frequency information of described current audio signals every preset time period, and export the frequency information of described power output and described current audio signals to described control module;
Described control module, for the frequency information according to described current audio signals, (N-1) individual power threshold that (N-1) individual power threshold corresponding with high-frequency band under described current volume for described power output or described current volume are bent down frequent section corresponding compares respectively, and controls signal to described LED display circuit accordingly according to comparative result output;
LED display circuit, for according to described control signal, glimmers according to the blink states preset;
The input of described data processing module is connected with described power amplifier, and the output of described data processing module is connected with the sampling input of described control module; The control output end of described control module is connected with described LED display circuit.
7. LED as claimed in claim 6 shows the circuit of audible spectrum, and it is characterized in that, the sample frequency of described control module is 100HZ.
8. LED as claimed in claim 7 shows the circuit of audible spectrum, and it is characterized in that, described data processing module is dsp chip; Described control module is single-chip microcomputer.
9. LED as claimed in claim 8 shows the circuit of audible spectrum, it is characterized in that, described LED display circuit comprises operating voltage input, a NPN triode, the 2nd NPN triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance and LED group; Wherein,
The anode of described LED group is all connected with described operating voltage input, and the negative electrode of described LED group is connected to the first node, and described first node is connected with the collector electrode of a NPN triode and the collector electrode of the 2nd NPN triode respectively; The base stage of the one NPN triode is connected with an I/O mouth of described control module through the first resistance, and the emitter of a NPN triode is through the 3rd grounding through resistance; The base stage of the 2nd NPN triode is connected with the 2nd I/O mouth of described control module through the second resistance, and the emitter of the 2nd NPN triode is through the 4th grounding through resistance.
10. a stereo set, is characterized in that, the described stereo set LED comprised according to any one of claim 6 to 9 shows the circuit of audible spectrum.
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