SU120619A1 - Method of measuring aperture characteristics of transmitting television tubes - Google Patents
Method of measuring aperture characteristics of transmitting television tubesInfo
- Publication number
- SU120619A1 SU120619A1 SU587218A SU587218A SU120619A1 SU 120619 A1 SU120619 A1 SU 120619A1 SU 587218 A SU587218 A SU 587218A SU 587218 A SU587218 A SU 587218A SU 120619 A1 SU120619 A1 SU 120619A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- video signal
- aperture characteristics
- transmitting television
- measuring aperture
- television tubes
- Prior art date
Links
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Description
Известны способы измерени апертурных характеристик передающих трубок, осиоваиные на выделении видеосигнала с определенного участка изображени , и определении амплитуды этого сигнала путем визуального сравнени его с П-образным импульсом известной величины.Methods are known for measuring the aperture characteristics of transmitting tubes, which are based on extracting a video signal from a certain part of the image, and determining the amplitude of this signal by visually comparing it with a U-shaped pulse of a known magnitude.
Недостаток подобных способов состоит в том, что они не дают возможности обеспечить объективность измерени апертурных характеристик трубок, так как при малых значени х сигналов особенно в нижней части характеристики, когда эти значени соизмеримы с уровнем шумов„ точно измерить амплитуды видеосигналов визуальным способом не удаетс .The disadvantage of such methods is that they do not provide for the objectivity of measuring the aperture characteristics of the tubes, since at low signal values, especially in the lower part of the characteristic, when these values are commensurate with the noise level, the video signal amplitudes cannot be measured visually.
В описываемом снособе этот недостаток устранен тем, что уровен видеосигнала, пропущенного через дифференцирующую цепочку, измер ют ламповым вольтметролг.In the described procedure, this disadvantage is eliminated by the fact that the level of the video signal passed through the differentiating chain is measured by a lamp volt meter.
По предлагаемому способу на дифференцирующую цепочку с исследуемого участка изображени подают видеосигнал, состо щий из П-образного импульса и сигнала изображени . Частотную характеристику дифференцирующей цепочки выбирают так, чтобы минимальна частота видеосигнала, образующегос на выходе передающей трубки при разложении вертикальных линий, была бы выще граничной частоты, при которой дифференцировани практически не происходит.According to the proposed method, a video signal consisting of a U-shaped pulse and an image signal is supplied to the differentiating chain from the investigated image area. The frequency response of the differentiating chain is chosen so that the minimum frequency of the video signal that is formed at the output of the transmitting tube when decomposing vertical lines is higher than the cut-off frequency at which differentiation practically does not occur.
При подобном выборе параметров дифференцирующей цепочки нроисходит выделение видеосигнала, который усиливаетс , усилителем и измер етс ламповым вольтметром.With such a choice of the parameters of the differentiating chain, there is a selection of the video signal, which is amplified by the amplifier and measured by a lamp voltmeter.
Предмет изобретени Subject invention
Способ измерени апертурных характеристик передающих телевизионных трубок с использованием прибора, выдел ющего видеосигнал с определенного участка изображени и вспомогательного П-образногоA method of measuring the aperture characteristics of transmitting television tubes using an instrument that extracts a video signal from a specific portion of the image and an auxiliary U-shaped
№ 120619No. 120619
импульса, отличающийс тем, что, с целью объективности измерени , достигаемой вследствие отсчета показаний по шкале лампового вольтметра, видеосигнал с исследуемого участка изображени пропускают через дифференцирующую цепочку, параметры которой подобраны так, чтобы она отдел ла видеосигнал от вспомогательного П-образного импульса, образующегос при выделении видеосигнала с участка изображени , и измер ют ламповым вольтметром на выходе дифференцирующей цепочки уровень видеосигнала, по которому суд т о апертурной характеристике трубки.pulse, characterized in that, for the purpose of measurement objectivity achieved due to reading the lamp voltmeter scale, the video signal from the investigated image area is passed through a differentiating chain, the parameters of which are chosen so that it separates the video signal from the auxiliary U-shaped pulse formed during extracting the video signal from the image section, and measuring the level of the video signal measured by the lamp voltmeter at the output of the differentiating chain, which determines the aperture characteristic tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU587218A SU120619A1 (en) | 1957-12-02 | 1957-12-02 | Method of measuring aperture characteristics of transmitting television tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU587218A SU120619A1 (en) | 1957-12-02 | 1957-12-02 | Method of measuring aperture characteristics of transmitting television tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU120619A1 true SU120619A1 (en) | 1958-11-30 |
Family
ID=48392473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU587218A SU120619A1 (en) | 1957-12-02 | 1957-12-02 | Method of measuring aperture characteristics of transmitting television tubes |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU120619A1 (en) |
-
1957
- 1957-12-02 SU SU587218A patent/SU120619A1/en active
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