GB1342052A - Multi-carrier transmisssion system - Google Patents
Multi-carrier transmisssion systemInfo
- Publication number
- GB1342052A GB1342052A GB5575770A GB5575770A GB1342052A GB 1342052 A GB1342052 A GB 1342052A GB 5575770 A GB5575770 A GB 5575770A GB 5575770 A GB5575770 A GB 5575770A GB 1342052 A GB1342052 A GB 1342052A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- signals
- signal
- television
- fed
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/12—Arrangements for reducing cross-talk between channels
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
- H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
- H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/12—Transference of modulation from one carrier to another, e.g. frequency-changing by means of semiconductor devices having more than two electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Details Of Television Systems (AREA)
- Superheterodyne Receivers (AREA)
Abstract
1342052 Television distribution; radio receiving apparatus SPENCER-KENNEDY LABORATORIES Inc 24 Nov 1970 [28 Nov 1969] 55757/70 Headings H3Q and H4R A converter for selecting any one of a number of television signals on a transmission path comprises a broad band input circuit for coupling to the path and translating the signals to a higher frequency, a narrow band circuit for selecting a predetermined one of the signals and means for translating that signal to the frequency of a predetermined television channel. As described the signals on the transmisson path are each on carriers of a frequency which is a different odd multiple of a reference frequency, e.g. 4À75 MHz. The signals are fed via a broad band amplifying stage Q1, Figs. 6 and 7, to a mixer stage Q2 fed with a signal from the voltage controlled oscillator Q to translate the required television channel to an intermediate frequency, e.g. 230 MHz, a three stage band pass filter including inductors L5 to L9 and capacitors C14-C16 feeds the intermediate frequency signal via tuned amplifier Q to a mixer Q5 fed with a signal from oscillator Q6 whose frequency is such as to shift the intermediate frequency to the frequency of an unused channel in a standard television set 1.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US88083969A | 1969-11-28 | 1969-11-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1342052A true GB1342052A (en) | 1973-12-25 |
Family
ID=25377221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5575770A Expired GB1342052A (en) | 1969-11-28 | 1970-11-24 | Multi-carrier transmisssion system |
Country Status (2)
Country | Link |
---|---|
US (1) | US3639840A (en) |
GB (1) | GB1342052A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2191370A (en) * | 1986-06-04 | 1987-12-09 | British Telecomm | Cable television distribution system |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3798548A (en) * | 1971-09-08 | 1974-03-19 | Ameco Inc | Discrete cable television distribution system |
US3898566A (en) * | 1972-10-02 | 1975-08-05 | Phasecom Corp | Method and apparatus for reducing distortion in multicarrier communication systems |
US3935534A (en) * | 1972-11-15 | 1976-01-27 | Columbia Pictures Industries, Inc. | Converter-tuner for information transmission system |
US3882266A (en) * | 1973-01-11 | 1975-05-06 | Oak Industries Inc | Apparatus for converting selected channels |
DE2334570B1 (en) * | 1973-07-07 | 1975-03-06 | Philips Patentverwaltung | Tunable radio frequency input circuitry for a television receiver |
NL7405405A (en) * | 1974-04-22 | 1975-10-24 | Philips Nv | TELEVISION DISTRIBUTION SYSTEM. |
US3942120A (en) * | 1974-07-22 | 1976-03-02 | Texas Instruments Incorporated | SWD FM receiver circuit |
US4077006A (en) * | 1975-03-14 | 1978-02-28 | Victor Nicholson | Bidirectional unicable switching system |
USRE31639E (en) * | 1975-03-14 | 1984-07-31 | Bidirectional unicable switching system | |
US4200839A (en) * | 1975-10-29 | 1980-04-29 | Gargini Eric J | Wired television broadcasting systems |
JPS5823978B2 (en) * | 1975-11-11 | 1983-05-18 | ソニー株式会社 | Chuyuna |
JPS5826699B2 (en) * | 1975-11-13 | 1983-06-04 | ソニー株式会社 | Chuyuna |
JPS5399811A (en) * | 1977-02-14 | 1978-08-31 | Torio Kk | Double superheterodyne system fm receiver |
US4408347A (en) * | 1977-07-29 | 1983-10-04 | Texas Instruments Incorporated | High-frequency channel selector having fixed bandpass filters in the RF section |
CA1173176A (en) * | 1979-06-04 | 1984-08-21 | Isao Fujimoto | Tuner apparatus |
FR2482388A1 (en) * | 1980-05-08 | 1981-11-13 | Visiodis | Channel selector for cable TV redistribution system - has two local intermediate frequency oscillators controlled by PLL operated by single quartz clock |
FR2487149B1 (en) * | 1980-07-18 | 1985-09-20 | Visiodis | TELEVISION SIGNAL DISTRIBUTION EQUIPMENT WITH INCORPORATED STABILIZATION DEVICE FOR CABLE NETWORK |
US4328590A (en) * | 1980-10-31 | 1982-05-04 | Westinghouse Electric Corp. | Single sideband receiver |
US4761825A (en) * | 1985-10-30 | 1988-08-02 | Capetronic (Bsr) Ltd. | TVRO earth station receiver for reducing interference and improving picture quality |
JPH0243822A (en) * | 1988-08-03 | 1990-02-14 | Toshiba Corp | Television tuner |
US5168214A (en) * | 1991-02-19 | 1992-12-01 | General Electric Company | Multi-rate superresolution time series spectrum analyzer |
JP3004105B2 (en) * | 1991-11-15 | 2000-01-31 | 株式会社東芝 | Television receiver |
KR0119499Y1 (en) * | 1993-08-20 | 1998-07-15 | 김광호 | Sound carrier detection circuit |
US6057876A (en) * | 1996-12-18 | 2000-05-02 | General Instrument Corporation | Dual conversion settop terminal including a system for avoiding oscillator difference beats |
AU768012B2 (en) * | 1998-09-08 | 2003-11-27 | Asvan Technology, Llc. | Enhanced security communications system |
US7043211B1 (en) * | 1998-11-30 | 2006-05-09 | General Instrument Corporation | Universal modulator |
JP2003223992A (en) * | 2002-01-31 | 2003-08-08 | Toyota Industries Corp | Organic el color display device |
US20040060074A1 (en) * | 2002-09-19 | 2004-03-25 | Ganesh Basawapatna | Video distribution system with increased centralized processing |
US7690022B2 (en) * | 2002-10-02 | 2010-03-30 | Ganesh Basawapatna | Video distribution system for digital and analog subscribers |
US7502587B2 (en) * | 2004-05-28 | 2009-03-10 | Echostar Technologies Corporation | Method and device for band translation |
US8000274B2 (en) * | 2005-04-05 | 2011-08-16 | Samsung Electronics Co., Ltd. | Versatile system for transceiver noise reduction in a time-division duplexing wireless network |
US9825772B2 (en) * | 2010-04-15 | 2017-11-21 | Time Warner Cable Enterprises Llc | Apparatus and method for increasing upstream capacity in a broadband communications system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2935607A (en) * | 1959-02-09 | 1960-05-03 | Rca Corp | Frequency variation response circuit |
US3209271A (en) * | 1961-08-17 | 1965-09-28 | Radiation Inc | Phase-locked loops |
GB1043231A (en) * | 1962-05-30 | 1966-09-21 | Communications Patents Ltd | Improved wired broadcasting systems and apparatus therefor |
US3358240A (en) * | 1965-03-11 | 1967-12-12 | George A Mckay | Extended phase detector for phaselocked loop receivers |
US3333198A (en) * | 1965-12-29 | 1967-07-25 | Ampli Vision Corp | Television converter for catv system |
US3510776A (en) * | 1966-02-16 | 1970-05-05 | Motorola Inc | Fm tone signal receiving circuit |
US3518376A (en) * | 1966-06-02 | 1970-06-30 | Educasting Systems Inc | Low frequency television system |
-
1969
- 1969-11-28 US US880839A patent/US3639840A/en not_active Expired - Lifetime
-
1970
- 1970-11-24 GB GB5575770A patent/GB1342052A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2191370A (en) * | 1986-06-04 | 1987-12-09 | British Telecomm | Cable television distribution system |
Also Published As
Publication number | Publication date |
---|---|
US3639840A (en) | 1972-02-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |