CN203691554U - TV main board audio frequency output test system - Google Patents
TV main board audio frequency output test system Download PDFInfo
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- CN203691554U CN203691554U CN201320752025.8U CN201320752025U CN203691554U CN 203691554 U CN203691554 U CN 203691554U CN 201320752025 U CN201320752025 U CN 201320752025U CN 203691554 U CN203691554 U CN 203691554U
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- audio frequency
- waveform display
- motherboard
- display apparatus
- frequency output
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Abstract
A TV main board audio frequency output test system relates to an audio frequency output test system; an output end of a TV main board power amplifier is connected with a loudspeaker; the test system comprises a sampling resistor and a waveform display both connected with the loudspeaker; the sampling resistor is used for generating sample voltage signals, and the waveform display is used for collecting the sample voltage signals and displaying the waveform of the sample voltage signals; the waveform display is connected in parallel with the sampling resistor being a non-inductive resistor; the output end of the TV main board power amplifier is connected with the loudspeaker so as to accurately simulate real usage condition; simultaneously the loudspeaker is connected in series with the non-inductive resistor so as to sample current signals outputted by the audio frequency; the non-inductive resistor converts the audio frequency output current signals into voltage signals with equal proportion; the voltage signals can be processed by the waveform display so as to present the voltage waveform; test personnel can accurately determine whether audio frequency output is distorted or not, the sound is low or not, and left and right sound channel outputs are balanced or not according to the voltage waveform.
Description
Technical field
The utility model relates to a kind of audio frequency output test macro, is specifically related to a kind of TV motherboard audio frequency output test macro.
Background technology
When production TV SKD, need to test the audio frequency output of TV SKD, existing generally have two kinds of test modes, a kind of is to use the alternative loud speaker of fixed resistance to receive the output of TV SKD power amplifier as load, detect ohmically signal and learn the audio frequency output performance of TV SKD, this mode time can not produce noise in test, but fixed resistance lacks the inductive load characteristic of loud speaker, in the time of the voice signal of audio frequency output distortion, detects not out; Another kind is to connect loud speaker at the output of TV SKD power amplifier, tester is by directly listening the sound that loud speaker sends to test, this mode can detect the situation of audio frequency output distortion, but because being adopts manually to listen to the sound that loud speaker sends the audio frequency output performance of TV SKD is tested, so cannot detect the signal strength signal intensity of TV SKD audio frequency output, not by tester, tester is more difficult accurately detects that sound is less than normal, left and right acoustic channels is exported unbalanced situation.
Summary of the invention
The purpose of this utility model is to provide one can detect audio frequency output distortion, can detect again the less than normal and left and right acoustic channels of audio frequency output sound and export unbalanced TV motherboard audio frequency output test macro.
For achieving the above object, the utility model provides following technical scheme.
TV motherboard audio frequency output test macro, the output of described TV motherboard power amplifier connects loud speaker, comprise with described loud speaker and connecting, for generation of the sample resistance of sampling voltage signal with for gathering sampling voltage signal and showing the Waveform display apparatus of sampling voltage signal waveform, Waveform display apparatus is in parallel with sample resistance, and sample resistance is noninductive resistance.
Wherein, also comprise for disappearing of filtering interference signals and disturb electric capacity, disappear and disturb electric capacity and connect with filtering low-frequency interference signal with filtering high-frequency interferencing signal or with Waveform display apparatus with Waveform display apparatus parallel connection.
Wherein, Waveform display apparatus is oscilloscope.
Wherein, described oscilloscope is dual trace oscilloscope.
Wherein, also comprise power amplifier for separating described TV motherboard and the voltage transformer of Waveform display apparatus, Waveform display apparatus is in parallel with sample resistance via described voltage transformer, described voltage transformer parallel connection of primary windings sample resistance, parallel connection of secondary windings Waveform display apparatus.
Wherein, the magnetic core of described voltage transformer is amorphous silicon steel magnet ring.
Wherein, also comprise the sound arrester for eliminating the sound that described loud speaker sends.
Wherein, sound arrester comprises tool box and be arranged on the acoustical cotton in tool box, and described loud speaker is arranged in tool box.
The beneficial effects of the utility model are: at the output termination loud speaker of TV motherboard power amplifier, the accurately actual situation about using of simulation, noninductive resistance of loud speaker series connection is simultaneously sampled to the current signal of audio frequency output, convert to the current signal equal proportion that noninductive resistance is exported audio frequency voltage signal to, then show voltage waveform out by Waveform display apparatus, tester can accurately judge and comprise that audio frequency exports the situations such as the less than normal and left and right acoustic channels output of whether distortion, sound is uneven according to this voltage waveform; In addition, reduce even to eliminate the sound that in test process, loud speaker sends by sound arrester, avoid producing noise.
Accompanying drawing explanation
Fig. 1 is the principle schematic of TV motherboard audio frequency output test macro of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
As shown in Figure 1, TV motherboard audio frequency output test macro of the present utility model, the output of described TV motherboard power amplifier connects loud speaker BZ, TV motherboard audio frequency of the present utility model output test macro comprise with described loud speaker BZ connect, for generation of the sample resistance R1 of sampling voltage signal with for gathering sampling voltage signal and showing the Waveform display apparatus of sampling voltage signal waveform, Waveform display apparatus is in parallel with sample resistance R1, and sample resistance R1 is noninductive resistance.Because loud speaker BZ is inductive load, if sample resistance R1 is also perceptual device, will have influence on test effect, so will adopt noninductive resistance as sample resistance R1.The audio signal of TV motherboard is from the output output of power amplifier after the power amplifier in TV motherboard amplifies, and the loud speaker BZ being connected with the output of power amplifier just can sound.Owing to flowing through the electric current of loud speaker BZ and can reflect the situation of TV motherboard audio frequency output, thus the electric current that can cross loud speaker BZ by sample streams to TV motherboard audio frequency output test.TV motherboard audio frequency output test macro of the present utility model is connected sample resistance R1 with loud speaker BZ, the electric current of sample resistance R1 is just identical with the electric current of loud speaker BZ like this, and sample resistance R1 electric current is detected and can learn TV motherboard audio frequency output performance.Because the resistance value of sample resistance R1 is constant, so the voltage at sample resistance R1 two ends is directly proportional with the electric current that flows through sample resistance R1, therefore using the voltage at sample resistance R1 two ends as sampling voltage signal, by the Waveform display apparatus in parallel with sample resistance R1, the waveform of described sampling voltage signal is shown, can learn TV motherboard audio frequency output performance according to the waveform of sampling voltage signal.Particularly, learn TV motherboard audio frequency output performance by waveform and the reference waveform of comparing this sampling voltage signal, first draw the error range of parameters according to reference waveform, corresponding parameter assert that in error range TV motherboard audio frequency output performance to be measured is qualified, otherwise assert that TV motherboard audio frequency output performance to be measured is defective.When the peak value of the waveform of sampling voltage signal exceeds the error range of peak value, show that volume is bigger than normal or less than normal; The waveform of the sampling voltage signal of left and right acoustic channels is inconsistent, shows that left and right acoustic channels output is uneven; The waveform defectiveness of sampling voltage signal, shows TV motherboard audio frequency to be measured output distortion.Particularly, in the present embodiment, Waveform display apparatus is dual trace oscilloscope.
As shown in Figure 1, TV motherboard audio frequency of the present utility model output test macro also comprises for disappearing of filtering interference signals disturbs capacitor C 1, disappears to disturb capacitor C 1 and connect with filtering high-frequency interferencing signal or with Waveform display apparatus with Waveform display apparatus parallel connection with filtering low-frequency interference signal (only illustrating in Fig. 1 disappears disturbs capacitor C 1 situation in parallel with Waveform display apparatus).
As shown in Figure 1, TV motherboard audio frequency of the present utility model output test macro also comprises power amplifier for separating described TV motherboard and the voltage transformer L1 of Waveform display apparatus, Waveform display apparatus is in parallel with sample resistance R1 via described voltage transformer L1, described voltage transformer L1 parallel connection of primary windings sample resistance R1, parallel connection of secondary windings Waveform display apparatus.This is because two outputs of most of TV motherboard power amplifier can not ground connection, two outputs of this TV motherboard power amplifier just can not directly connect the Waveform display apparatus of ground connection, therefore need to isolate by voltage transformer L1, to guarantee the normal output of TV motherboard power amplifier.In the present embodiment, the magnetic core of voltage transformer L1 is amorphous silicon steel magnet ring, and this voltage transformer L1 uses while being relatively applicable to test low frequency audio frequency, when test high-frequency audio, need select the magnetic core of other materials just can obtain best test effect.
Further, as shown in Figure 1, TV motherboard audio frequency of the present utility model output test macro also comprises the sound arrester for eliminating the sound that described loud speaker BZ sends, in the present embodiment, sound arrester comprises tool box and be arranged on the acoustical cotton in tool box, and described loud speaker BZ is arranged in tool box.Sound arrester can reduce even to eliminate the sound that in test process, loud speaker BZ sends, and avoids producing noise.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (8)
1. TV motherboard audio frequency output test macro, the output of described TV motherboard power amplifier connects loud speaker, it is characterized in that: comprise with described loud speaker and connecting, for generation of the sample resistance of sampling voltage signal with for gathering sampling voltage signal and showing the Waveform display apparatus of sampling voltage signal waveform, Waveform display apparatus is in parallel with sample resistance, and sample resistance is noninductive resistance.
2. TV motherboard audio frequency output test macro according to claim 1, it is characterized in that: also comprise for disappearing of filtering interference signals and disturb electric capacity, disappear and disturb electric capacity and connect with filtering low-frequency interference signal with filtering high-frequency interferencing signal or with Waveform display apparatus with Waveform display apparatus parallel connection.
3. TV motherboard audio frequency output test macro according to claim 1 and 2, is characterized in that: Waveform display apparatus is oscilloscope.
4. TV motherboard audio frequency output test macro according to claim 3, is characterized in that: described oscilloscope is dual trace oscilloscope.
5. TV motherboard audio frequency output test macro according to claim 1, it is characterized in that: also comprise power amplifier for separating described TV motherboard and the voltage transformer of Waveform display apparatus, Waveform display apparatus is in parallel with sample resistance via described voltage transformer, described voltage transformer parallel connection of primary windings sample resistance, parallel connection of secondary windings Waveform display apparatus.
6. TV motherboard audio frequency output test macro according to claim 5, is characterized in that: the magnetic core of described voltage transformer is amorphous silicon steel magnet ring.
7. TV motherboard audio frequency according to claim 1 output test macro, is characterized in that: also comprise the sound arrester for eliminating the sound that described loud speaker sends.
8. TV motherboard audio frequency according to claim 7 output test macro, is characterized in that: sound arrester comprises tool box and be arranged on the acoustical cotton in tool box, and described loud speaker is arranged in tool box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320752025.8U CN203691554U (en) | 2013-11-25 | 2013-11-25 | TV main board audio frequency output test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320752025.8U CN203691554U (en) | 2013-11-25 | 2013-11-25 | TV main board audio frequency output test system |
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| Publication Number | Publication Date |
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| CN203691554U true CN203691554U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320752025.8U Expired - Fee Related CN203691554U (en) | 2013-11-25 | 2013-11-25 | TV main board audio frequency output test system |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106162486A (en) * | 2015-04-28 | 2016-11-23 | 深圳市祈飞科技有限公司 | Power amplifier chips adjustment method and system, template power amplifier chips for adaptive loudspeaker |
| CN109040719A (en) * | 2018-10-19 | 2018-12-18 | 天津英田视讯科技有限公司 | A kind of supervisor's spherical camera |
| CN112584292A (en) * | 2020-12-01 | 2021-03-30 | 广州朗国电子科技有限公司 | Mainboard sound detection method and device and terminal |
-
2013
- 2013-11-25 CN CN201320752025.8U patent/CN203691554U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106162486A (en) * | 2015-04-28 | 2016-11-23 | 深圳市祈飞科技有限公司 | Power amplifier chips adjustment method and system, template power amplifier chips for adaptive loudspeaker |
| CN106162486B (en) * | 2015-04-28 | 2019-05-17 | 深圳市祈飞科技有限公司 | For being adapted to the power amplifier chips adjustment method and system, simulation power amplification chip of loudspeaker |
| CN109040719A (en) * | 2018-10-19 | 2018-12-18 | 天津英田视讯科技有限公司 | A kind of supervisor's spherical camera |
| CN112584292A (en) * | 2020-12-01 | 2021-03-30 | 广州朗国电子科技有限公司 | Mainboard sound detection method and device and terminal |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20211125 |
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| CF01 | Termination of patent right due to non-payment of annual fee |