GB1365222A - Method of testing a video amplifier - Google Patents
Method of testing a video amplifierInfo
- Publication number
- GB1365222A GB1365222A GB2370772A GB2370772A GB1365222A GB 1365222 A GB1365222 A GB 1365222A GB 2370772 A GB2370772 A GB 2370772A GB 2370772 A GB2370772 A GB 2370772A GB 1365222 A GB1365222 A GB 1365222A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stages
- amplifier
- gain control
- automatic gain
- testing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010998 test method Methods 0.000 title abstract 3
- 238000012360 testing method Methods 0.000 abstract 4
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Picture Signal Circuits (AREA)
Abstract
1365222 Method of testing a video amplifier ROBERT BOSCH FERNSEHANLAGEN GmbH 19 May 1972 [21 May 1971] 23707/72 Heading G1U A method of testing a video amplifier including automatic gain control stages, is characterized in that before a test signal is applied to the amplifier, and for the duration of the test signal, the automatic gain control stages are rendered inoperative and the gain of the amplifier is set at a known level, such as unity. In the preferred embodiment a conventional video amplifier Fig. 1, comprising stages 1, 11 to 14 and a positive/ negative switch 2, the stages 11 to 14 compensating respectively for stray light, black value, gamma and colour match, is provided with switches 18a to 18f between automatic gain control signals shown originating from potentiometers 80 to 85, which switches, when activatedby signals N1 and N2, over-ride the automatic gain control signals and set the stages at unity gain. A test signal can then be passed through the amplifier and examined for distortion. As shown the signals N1 and N2 can be applied either singly or together in order to effect tests under different conditions. Suitable switching circuits 18a to 18f and amplifier stages are described Figs. 2 to 5 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712125223 DE2125223A1 (en) | 1971-05-21 | 1971-05-21 | METHOD OF MEASURING THE TEST SIGNALS OF TEST LINES THAT HAVE CROSSED AN AMPLIFIER, IN PARTICULAR A VIDEO AMPLIFIER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1365222A true GB1365222A (en) | 1974-08-29 |
Family
ID=5808525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2370772A Expired GB1365222A (en) | 1971-05-21 | 1972-05-19 | Method of testing a video amplifier |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2125223A1 (en) |
| FR (1) | FR2143669B3 (en) |
| GB (1) | GB1365222A (en) |
| NL (1) | NL7206812A (en) |
-
1971
- 1971-05-21 DE DE19712125223 patent/DE2125223A1/en active Pending
-
1972
- 1972-05-17 FR FR7217560A patent/FR2143669B3/fr not_active Expired
- 1972-05-19 GB GB2370772A patent/GB1365222A/en not_active Expired
- 1972-05-19 NL NL7206812A patent/NL7206812A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2143669A1 (en) | 1973-02-09 |
| FR2143669B3 (en) | 1974-10-31 |
| NL7206812A (en) | 1972-11-23 |
| DE2125223A1 (en) | 1973-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |