CN101483736A - Television set with spectrum display function - Google Patents
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- CN101483736A CN101483736A CNA2008101882776A CN200810188277A CN101483736A CN 101483736 A CN101483736 A CN 101483736A CN A2008101882776 A CNA2008101882776 A CN A2008101882776A CN 200810188277 A CN200810188277 A CN 200810188277A CN 101483736 A CN101483736 A CN 101483736A
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- 238000001228 spectrum Methods 0.000 title claims abstract description 36
- 230000003321 amplification Effects 0.000 claims abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 5
- 230000005236 sound signal Effects 0.000 claims description 25
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 2
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Abstract
A TV having display function of band-limited spectrum belongs to the technical field of TV image display, comprising a TV main board circuit for inputting the port of the circuit on the motherboard audio sound power amplifier signal, a filter access N detector circuit group, through the filter after the detector circuit, the number of the sinusoidal signal superimposed with each other in accordance with a certain frequency interval, through the selective frequency amplification sample amplification circuit, and the peak detector signal, and then N frequency points, one of the detector signal is connected to its corresponding voltage comparator n-1 with the field scanning synchronization sawtooth signal comparison, and the other signal also be sent to the corresponding voltage comparator n-2 with an adjustable DC voltage (Un) compared by the comparator output voltage signal of the two groups at the same time was admitted with the gate circuit, pulse shaping circuits, pulse output the final video to be displayed on the screen.
Description
Technical field
The invention belongs to TV images Display Technique field, specially refer to a kind of television set with spectrum display function.
Background technology
Now, color television set has entered huge numbers of families, after the sixties in last century, colourcast has obtained breakthrough development in the world, and China broadcasts the eighties since 70 years color television sets, colour TV develops " explosivity ", national colour TV owning amount surpassed 6,000 ten thousand by 1992, and its reliability, production domesticization ratio, price and development technique are all approaching or reached international most advanced level, have every year 2000000 colour TVs to sell to world market.
Along with users to the improving constantly of the every technical indicator of television set, also encouraging the producer of television set production to develop innovative product generation upon generation of, no matter show with everyway such as sound equipment conciliation and carried out professional subject study at image.The present television set that uses, sound accompaniment generally only is provided with a volume control function, seldom be provided with the tone control function, but along with the raising of people to the television set grade requirement, particularly PDP, LCD flat panel show that television screen constantly increases, generally all be provided with external speaker, or external active audio amplifier, correspondingly the grade requirement to television audio also can improve constantly.In some advanced audios, generally all be provided with a small screen LCD or LED frequency response indicating device, be used for the indication of audio frequency output carrying out frequency spectrum; But, do not see also basically at home and abroad that at present the someone uses television screen to come audio frequency output carrying out frequency spectrum is shown for television set.
The user is meticulousr to television audio tonequality in order to satisfy, the demand of richer temperament and interest, also carry out the regulation and control of tone color, tone in order to be convenient to that the user just can be exported television audio by remote controller, the design artificially adapts to above-mentioned requirements, has developed so brand-new problem.
Summary of the invention
The technical issues that need to address of the present invention are, at in the existing television set adjusting of sound accompaniment just being regulated the size of volume intensity by remote controller, and not to tone color, tone is regulated, along with people's improving constantly to the television field frame grade requirement, just can not only rest on the television sound power is controlled, in order to overcome this weak point, just need a kind of regulation and control of exploitation to the sound accompaniment grade, the purpose of this invention is to provide a kind of television set with spectrum display function, it is bright to relate to a kind of TV images Display Technique, a kind of spectrum amplitude to television audio signals carries out technique for displaying, utilize this spectrum amplitude to show (being called for short frequency spectrum shows) technology, can realize the amplitude of each Frequency point correspondence of television audio signals is shown, so that exporting television audio with remote controller, the user carries out tone control, to satisfy the needs that the user promotes the graceful degree of television audio tonequality.
In order to realize purpose of the present invention, the technical scheme that is adopted is as follows: a kind of television set with spectrum display function, comprise the TV SKD circuit, it is characterized in that, the audio signal input end mouth of the sound accompaniment power amplifier in described TV SKD circuit, insert N filtering detector circuit group, wherein N is for intending by the Frequency point number of screen display, by this filtering detector circuit audio signal is taken a sample, promptly the sine wave signal of numerous mutual stacks according to certain frequency interval, by the selective frequency amplifier circuit amplification of taking a sample, and signal carried out peak detection, then the detection output signal Fn one of in N the Frequency point is delivered to the synchronous sawtooth signal of voltage comparator n-1 corresponding and field scan and compare, promptly carry out field phase and handle with it; Meanwhile, another also is sent to the voltage comparator n-2 corresponding with it with the synchronous sawtooth signal of line scanning and a certain adjustable dc voltage Un compares, promptly carrying out line phase handles, two groups of signals through voltage comparator output are admitted to AND circuit, pulse shaper simultaneously, obtain video pulse output at last and are presented on the screen.The described filter of selecting in the sinusoidal wave filter detector circuit can be with active or passive.
Beneficial effect of the present invention is, by circuit of the present invention, can reach the tone color of television audio output, the adjusting control of tone, promoted Television Sound Quality.
Description of drawings
Fig. 1 is shown audio signal spectrum amplitude schematic diagram;
Fig. 2 shows the circuit theory diagrams of looking for audio signal being carried out frequency spectrum;
Fig. 3 is output, the input oscillogram after the signal processing;
Fig. 4 looks circuit theory diagrams for the audio signal frequency spectrum through simplifying shows.
Embodiment
With reference to Fig. 1, be illustrated in the schematic diagram that shows the audio signal spectrum amplitude on the television screen, be called the frequency spectrum displayed map again.This figure can be easy to determine the amplitude and the frequency of each frequency signal (component).We can regard audio signal as by the mutual superposition of a lot of sine wave signals result, therefore, our available filters or filter amplifier, according to certain frequency interval, the audio signal of certain bandwidth is divided into a plurality of Frequency points takes a sample, and the amplitude of each Frequency point shown, promptly spectrum amplitude is shown.It among Fig. 1 the schematic diagram of representing spectrum amplitude with the vertical line height, the corresponding audio frequency signal amplitude that shows a Frequency point of each bar vertical line, for example, article one vertical line height is represented the amplitude of F1 audio signal, second vertical line height is represented the amplitude of F2 audio signal, and other by that analogy.Therefore, we call spectrum line to these vertical lines of representing the amplitude of certain Frequency point audio signal.
The audio signal that receives when television set, when wherein the amplitude of certain frequency signal changes, its corresponding vertical line height will change, the amplitude of each frequency signal is not fixed in the general television audio signal, it can constantly change along with the content of music, therefore, will see that on video screen all spectrum lines are all ceaselessly beating.
With reference to Fig. 2, expression realizes that Fig. 1 carries out the circuit theory diagrams that frequency spectrum shows to audio signal on television screen.Because audio signal can be regarded the result by the mutual superposition of a lot of sine wave signals as, if certain sine wave signal is handled, the simplest method uses filter (active or passive) that sine wave signal is elected exactly, and then handles.Fig. 2 block diagram is the process that the audio signal of F1 is carried out processing for the expression frequency, and we abbreviate this process that audio signal is handled as sound-video conversion process.Among Fig. 2, the effect of filtering wave detector 1 is exactly to be that the audio signal of F1 is carried out frequency-selecting and amplification to frequency, then signal is carried out peak detection.Therefore, there is the frequency spectrum of what Frequency points to show, just in requisition for what filtering detector circuits.In like manner, there is the frequency spectrum of what Frequency points to show, just in requisition for how many road sound-vision signal change-over circuits.Among Fig. 2, only for example expression is the process that the audio signal of F1 is carried out sound-video conversion process to frequency, and the processing procedure of the audio signal of all the other frequencies can be by that analogy.
With reference to Fig. 3, it is the input and output waveform of each signal processing unit among Fig. 2.Among Fig. 2, the signal (Fig. 3 signal 2) that audio signal (Fig. 3 signal 1) is handled back output through the filtering wave detector is a direct current signal or a pulsating direct current signal that rate variation is very slow, its amplitude approximates sinusoidal wave peak value, signal 2 is delivered to voltage comparator 1-1 simultaneously with the sawtooth waveforms (Fig. 3 signal 4) of saw-toothed wave generator 1 output and is compared then, when the amplitude of sawtooth waveforms (Fig. 3 signal 4) equals the amplitude of signal 2, voltage comparator 1-1 just has signal (Fig. 3 signal 5) output, or the polarity of output signal will change (positive pulse or negative pulse).Signal 5 is a pulse synchronous with the field scan lock-out pulse (signal 3) signals.
Field system chronizing impulse signal 3 at first passes through saw-toothed wave generator 1, produce a sawtooth signal 4 synchronous then with field scan, because the phase place and the field scan of voltage comparator 1-1 input signal 4 are synchronous, the pulse duration of voltage comparator 1-1 output signal 5 is relevant with the amplitude of signal 2, and phase place is relevant with the amplitude of sawtooth signal 4, therefore, the length of the just corresponding decision spectrum line of the pulse duration of signal 5, and its phase place will determine the original position of spectrum line in video screen.
For the ease of analyzing, we are drawn as the waveform of each point among Fig. 2 is positive, because, not having specification signal 4 and signal 7 is before the input of which port (in-phase end and end of oppisite phase) of voltage comparator 1-1 and voltage comparator 1-2, specified signal is positive and negative simply, and its meaning is not very big, therefore, waveform and the waveform in the practical application drawn among Fig. 3 are distinguishing, but can not influence our analysis to operation principle.In addition, the positive and negative of indication signal is for AC signal here, and in the practical application, all signals are not simple AC signal, but the AC and DC mixed signal, promptly, contain alternating current component in the direct current signal, or contain DC component in the AC signal.
When the end of oppisite phase input of signal 2 from voltage comparator 1-1, and sawtooth waveforms (signal 4) is during from the input of the in-phase end of voltage comparator 1-1, the pulse duration (positive pulse) of voltage comparator 1-1 output signal 5 and the amplitude of signal 2 are inversely proportional to, and the signal 9 of this moment AND circuit 1 and shaping pulse 1 output and signal 10 are τ 3, τ 4 waveforms (among Fig. 3 shown in the solid line); If need the pulse duration (positive pulse width) of voltage comparator 1-1 output signal 5 to be directly proportional, only need the phase place of filtering wave detector 1 output signal is just in time got final product mutually with anti-of signal 2 phase places shown in Fig. 3 with the amplitude of signal 1.
If signal 2 is from the input of the in-phase end of voltage comparator 1-1, and sawtooth signal (signal 4) is during from the end of oppisite phase input of voltage comparator 1-1, and the pulse duration (or angle of flow) of voltage comparator 1-1 output signal 5 is directly proportional with the amplitude of signal 2; But, the signal 9 and the signal 10 of this moment AND circuit 1 and shaping pulse 1 output are not τ 3, τ 4 waveforms, but τ shown in dotted lines in Figure 31, τ 2 waveforms.
Hence one can see that, if the width of voltage comparator 1-1 output signal 5 preceding half cycle pulses and the amplitude of signal 2 are inversely proportional to, then the width of its second half pulse just is directly proportional with the amplitude of signal 2; If the width of half cycle pulses is directly proportional with the amplitude of signal 2 before the voltage comparator 1-1 output signal 5, then the width of its second half pulse just is inversely proportional to the amplitude of signal 2.Select which type of output result, this will depend on the polarity of voltage comparator input signal, and the polarity of voltage comparator input signal then needs to be decided by the field scan mode and the display mode of television set.For example, for the pal television machine, its field scan mode is from top to bottom, from left to right, if the position that shows spectrum line in screen is just in time below screen, then on phase place, must select the output waveform of τ 3, τ 4, further select the input signal polarity of voltage comparator 1-1 thus again.
By last surface analysis as can be known, when the inversion signal of signal 2 is imported from the end of oppisite phase of voltage comparator 1-1, and sawtooth signal (signal 4) is during from the input of the in-phase end of voltage comparator 1-1, the pulse duration (positive pulse) of voltage comparator 1-1 output signal 5 is directly proportional with the amplitude of signal 1, shows that the height of spectrum line is directly proportional with the amplitude of signal 1 that is:.
But the signal that light has a decision spectrum line vertical height not enough, also needs the signal of a decision spectrum line horizontal line width and horizontal level, could show a vertical line behind two signal superpositions on video screen.Among Fig. 2, the output signal 8 of voltage comparator 1-2 is used for locating the horizontal level of vertical line in image shows, it is synchronous by horizontal synchronizing pulse (signal 6), and the signal 10 of decision horizontal line width is then produced by shaping pulse 1 circuit, pulse duration is wide more, and the horizontal line width is just long more.
Horizontal synchronizing pulse signal 6 at first passes through saw-toothed wave generator 2, produce a sawtooth signal 7 synchronous then with line scanning, then, sawtooth signal 7 is delivered to voltage comparator 1-2 simultaneously with direct voltage U1 and is compared, the output signal 8 of voltage comparator 1-2 just changes when the amplitude of sawtooth waveforms (signal 7) equals the amplitude of direct voltage U1, signal 8 also is a pulse signal, and its phase place is relevant with the amplitude of direct voltage U1.This phase place just determines the horizontal level of spectrum line in video screen, therefore, regulates the amplitude of direct voltage U1, just can regulate the horizontal level of certain spectrum line in video screen.
Because the line-scanning period and the field-scanning period of television set have differed hundred times, therefore the signal 5 of voltage comparator 1-1 and voltage comparator 1-2 output and signal 8 also need mutually synchronously, therefore, the AND circuit among Fig. 21 is used for realizing that two signals are synchronous mutually.The signal 9 of gate circuit 1 output also needs further to carry out shaping pulse through shaping pulse 1 circuit, makes pulse duration and amplitude satisfy the requirement of frequency spectrum screen display fully.
The signal 10 of shaping pulse 1 circuit output among Fig. 2 is (F1) in several frequency spectrum shows signal, and method and above-mentioned analytical method that other frequency spectrum shows signal produces are identical.
Among Fig. 2 and Fig. 3, signal 3,4,5 and field scan are synchronous, and signal 6,7,8,9,10 and line scanning are synchronous, and therefore, in Fig. 3, two groups of signals are different on time scale, and both differ hundred times.
With reference to Fig. 4, the circuit in its presentation graphs 2 can further be reduced to Fig. 4.Comparison diagram 2 and Fig. 4 can know that the AND circuit of Fig. 2 has been simplified, and directly control the working power switching of voltage comparator 1-2 by the output signal 5 of voltage comparator 1-1, thereby reach the purpose of control voltage comparator 1-2 signal output.In addition, other operation principle of Fig. 4 is fully identical with the operation principle of Fig. 2.
Claims (2)
1. television set with spectrum display function, comprise the TV SKD circuit, it is characterized in that, the audio signal input end mouth of the sound accompaniment power amplifier in described TV SKD circuit, insert N filtering detector circuit group, wherein N is for intending by the Frequency point number of screen display, by this filtering detector circuit audio signal is taken a sample, promptly the sine wave signal of numerous mutual stacks according to certain frequency interval, by the selective frequency amplifier circuit amplification of taking a sample, and signal carried out peak detection, then the detection output signal Fn one of in N the Frequency point is sent to the synchronous sawtooth signal of voltage comparator n-1 corresponding and field scan and compares, promptly carry out field phase and handle with it; Meanwhile, another also is sent to the voltage comparator n-2 corresponding with it with the synchronous sawtooth signal of line scanning and a certain adjustable dc voltage Un compares, promptly carrying out line phase handles, two groups of signals through voltage comparator output are admitted to AND circuit, pulse shaper simultaneously, obtain video pulse output at last and are presented on the screen.
2. the television set of band spectrum display function according to claim 1 is characterized in that, the filter in the described filter detector circuit of selecting sine wave signal can be with active or passive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101882776A CN101483736A (en) | 2008-12-23 | 2008-12-23 | Television set with spectrum display function |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101882776A CN101483736A (en) | 2008-12-23 | 2008-12-23 | Television set with spectrum display function |
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| CNA2008101882776A Pending CN101483736A (en) | 2008-12-23 | 2008-12-23 | Television set with spectrum display function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841674A (en) * | 2010-02-10 | 2010-09-22 | 青岛海信电器股份有限公司 | Method and device for spectrum processing, OSD display spectrum processing device and television thereof |
| CN105763895A (en) * | 2016-04-15 | 2016-07-13 | 无锡天脉聚源传媒科技有限公司 | Sound processing method, device and system for multi-channel monitoring interface |
| CN109714500A (en) * | 2019-01-17 | 2019-05-03 | 中孚信息股份有限公司 | A kind of VGA video unidirectional transmission method and device |
-
2008
- 2008-12-23 CN CNA2008101882776A patent/CN101483736A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841674A (en) * | 2010-02-10 | 2010-09-22 | 青岛海信电器股份有限公司 | Method and device for spectrum processing, OSD display spectrum processing device and television thereof |
| CN101841674B (en) * | 2010-02-10 | 2012-07-04 | 青岛海信电器股份有限公司 | Method and device for spectrum processing, OSD display spectrum processing device and television thereof |
| CN105763895A (en) * | 2016-04-15 | 2016-07-13 | 无锡天脉聚源传媒科技有限公司 | Sound processing method, device and system for multi-channel monitoring interface |
| CN109714500A (en) * | 2019-01-17 | 2019-05-03 | 中孚信息股份有限公司 | A kind of VGA video unidirectional transmission method and device |
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Application publication date: 20090715 |