GB1353018A - Automatic transversal equalizer - Google Patents
Automatic transversal equalizerInfo
- Publication number
- GB1353018A GB1353018A GB1903970A GB1353018DA GB1353018A GB 1353018 A GB1353018 A GB 1353018A GB 1903970 A GB1903970 A GB 1903970A GB 1353018D A GB1353018D A GB 1353018DA GB 1353018 A GB1353018 A GB 1353018A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- amplifier
- fed
- transversal filter
- equalizer
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
1353018 Automatic equalizers XEROX CORP 20 April 1971 [21 April 1970] 19039/70 Heading H4R An automatically adjusting equalizer has a transversal filter with its taps fixed to give an amplitude frequency response having a rising characteristic, following a raised cosine curve, between 600 and 3000 Hz. The output, 30, from the transversal filter is fed via a potentiometer 56 to a summing amplifier where it is added to the signal appearing at the centre tapping 40, of the transversal filter delay line. The potentiometer is automatically adjusted to provide equalization for two different frequency pilot signals transmitted over the transmission system and fed through the equalizer. As described with respect to Fig. 8 the full equalizer comprises a transversal filter including delay line sections T with the signal appearing at the input, output, and middle, taps fed through respective resistors 24, 26, 28, to an inverting amplifier 50. The output of amplifier 50 is mixed with the signal appearing at the two other taps, fed through respective resistors 25, 27, at the input to a second inverting amplifier 54. The resulting signal, constituting the output of the transversal filter, is fed through a variable resistor 56 to be mixed with the signal appearing at the centre tap of the filter at the input of a third amplifier 58, the output from which constitutes the equalizer output. The received signal includes two reference or pilot signals at 1200 and 2400 Hz, the relative levels of which, at the transmitter, are known; these reference signals are separated by filters 67 and 68, amplified, and rectified to provide opposing D.C. voltages at the input of amplifier 72 to provide a control signal for driving motor 73 in such a way as to adjust potentiometer 56 to restore the relative levels of the two pilots to the values they had at the transmitter.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1903970 | 1970-04-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1353018A true GB1353018A (en) | 1974-05-15 |
Family
ID=10122741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1903970A Expired GB1353018A (en) | 1970-04-21 | 1970-04-21 | Automatic transversal equalizer |
Country Status (3)
Country | Link |
---|---|
US (1) | US3670269A (en) |
CA (1) | CA932412A (en) |
GB (1) | GB1353018A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE793458A (en) * | 1971-12-30 | 1973-06-28 | Philips Nv | AUTOMATIC EQUALIZATION DEVICE |
US3798576A (en) * | 1971-12-30 | 1974-03-19 | Xerox Corp | Automatic equalization method and apparatus |
US4096454A (en) * | 1976-04-06 | 1978-06-20 | Rca Corporation | Amplitude and delay equalization of surface acoustic wave filters in amplitude modulation system |
IT1113607B (en) * | 1977-09-01 | 1986-01-20 | Sits Soc It Telecom Siemens | CIRCUIT ARRANGEMENT FOR THE AUTOMATIC EQUALIZATION OF A WIDE-CABLE TRANSMISSION SYSTEM |
GB2036509B (en) * | 1978-10-27 | 1983-01-26 | Kokusai Denshin Denwa Co Ltd | Automatic phase and amplitude equalisation of fm signals |
US4283693A (en) * | 1979-01-17 | 1981-08-11 | Rockwell International Corporation | Amplitude tilt compensating apparatus |
EP0080544B1 (en) * | 1981-11-30 | 1986-03-19 | International Business Machines Corporation | Method for receiving a data signal with double side-band quadrature carrier modulation |
YU47270B (en) * | 1986-10-31 | 1995-01-31 | Siemens Aktiengesellschaft Berlin I Minhen | ADAPTIVE FREQUENCY DOMAIN CORRECTOR FOR DIGITAL RADIO RELAY SYSTEMS |
JP2531699B2 (en) * | 1987-09-08 | 1996-09-04 | 株式会社日立製作所 | Waveform equalization method and device |
EP0363500B1 (en) * | 1988-09-29 | 1993-06-16 | Siemens Aktiengesellschaft | Circuit arrangement for the correction of digital signals received in an analogous form |
US5293405A (en) * | 1991-10-31 | 1994-03-08 | International Business Machines Corp. | Adaptive equalization and regeneration system |
US9762417B1 (en) * | 2016-09-28 | 2017-09-12 | Integra Research And Development, Llc | Adaptive equalization for vestigial sideband (VSB) transmissions |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3017508A (en) * | 1959-09-14 | 1962-01-16 | Gen Electric | Automatic gain control system |
US3011135A (en) * | 1960-07-25 | 1961-11-28 | Gen Dynamics Corp | Automatic dynamic delay equalizer for reducing distortion |
US3292116A (en) * | 1964-03-20 | 1966-12-13 | Hazeltine Research Inc | Dynamic speech equalizing system having a control circuit that separates and compares the high and low frequency energy |
US3292110A (en) * | 1964-09-16 | 1966-12-13 | Bell Telephone Labor Inc | Transversal equalizer for digital transmission systems wherein polarity of time-spaced portions of output signal controls corresponding multiplier setting |
-
1970
- 1970-04-21 GB GB1903970A patent/GB1353018A/en not_active Expired
- 1970-11-06 US US87546A patent/US3670269A/en not_active Expired - Lifetime
-
1971
- 1971-03-19 CA CA108217A patent/CA932412A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3670269A (en) | 1972-06-13 |
CA932412A (en) | 1973-08-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |