GB1119261A - Wave form equalizers - Google Patents
Wave form equalizersInfo
- Publication number
- GB1119261A GB1119261A GB2203163A GB2203163A GB1119261A GB 1119261 A GB1119261 A GB 1119261A GB 2203163 A GB2203163 A GB 2203163A GB 2203163 A GB2203163 A GB 2203163A GB 1119261 A GB1119261 A GB 1119261A
- Authority
- GB
- United Kingdom
- Prior art keywords
- delay line
- equalizer
- signal
- added
- frequency characteristic
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/04—Shaping pulses by increasing duration; by decreasing duration
- H03K5/06—Shaping pulses by increasing duration; by decreasing duration by the use of delay lines or other analogue delay elements
- H03K5/065—Shaping pulses by increasing duration; by decreasing duration by the use of delay lines or other analogue delay elements using dispersive delay lines
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
1,119,261. Automatic equalization. FUJITSU Ltd. 17 Feb., 1965 [17 Nov., 1963], No. 22031/63. Heading H4R. An automatic equalization system uses a differentiated echo type equalizer and a frequency characteristic equalizer in combination, the frequency characteristic equalizer operating of the lower frequency components of the signal. Fig. 5 shows a system for equalizing a line 4 for the transmission of television video signals from a source 1. At the transmitter a synch. separator 2 synchronizes a pilot waveform generator 3 the output of which, e.g. a square wave, is added to the transmitted signal, outside the time or frequency band of the television signal, e.g. during the frame blanking period. At the receiver the signals are applied to the echo type equalizer which includes the tapped delay line DL from the tap Ao of which the signal is applied to the frequency characteristic equalizer LE before the differentiated outputs from the other taps of the delay line are added at the input of amplifier 12. The proportions of the outputs of the various taps of the delay line which are to be added to the output from tap Ao, and the constants of the frequency characteristic equalizer are determined by the automatic adjusting system in which a synchronizing circuit 5 causes generator 7 to produce an appropriately synchronized replica of the pilot wave form added to the television signal at the transmitter. The locally generated pilot waveform is compared with the received pilot waveform in differential amplifier DA and a difference signal is produced which is sampled in circuit S at times determined by the synchronizing circuit 5 and related to the delay in the tapped delay line DL. The sampled difference signal is then fed through gates G-m to Gt2, opened at times corresponding to the time of appearance of the pilot waveform at the delay line tap with which the gate is associated, to operate adjusting motors M-m to Mt2 which adjust the attenuators K-m to Kn on the delay line taps, and the values of the components of the equalizer LE, to tend to reduce the values of the sampled difference signal to zero.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2203163A GB1119261A (en) | 1963-11-17 | 1963-11-17 | Wave form equalizers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2203163A GB1119261A (en) | 1963-11-17 | 1963-11-17 | Wave form equalizers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1119261A true GB1119261A (en) | 1968-07-10 |
Family
ID=10172802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2203163A Expired GB1119261A (en) | 1963-11-17 | 1963-11-17 | Wave form equalizers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1119261A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4388729A (en) | 1973-03-23 | 1983-06-14 | Dolby Laboratories, Inc. | Systems for reducing noise in video signals using amplitude averaging of undelayed and time delayed signals |
-
1963
- 1963-11-17 GB GB2203163A patent/GB1119261A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4388729A (en) | 1973-03-23 | 1983-06-14 | Dolby Laboratories, Inc. | Systems for reducing noise in video signals using amplitude averaging of undelayed and time delayed signals |
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