BR7804326A - Dispositivo para filtrar um canal de frequencia,receptor de televisao aperfeicoado,e seletor de canais - Google Patents
Dispositivo para filtrar um canal de frequencia,receptor de televisao aperfeicoado,e seletor de canaisInfo
- Publication number
- BR7804326A BR7804326A BR7804326A BR7804326A BR7804326A BR 7804326 A BR7804326 A BR 7804326A BR 7804326 A BR7804326 A BR 7804326A BR 7804326 A BR7804326 A BR 7804326A BR 7804326 A BR7804326 A BR 7804326A
- Authority
- BR
- Brazil
- Prior art keywords
- channel
- filtering
- television receiver
- frequency channel
- perfect
- Prior art date
Links
- 238000001914 filtration Methods 0.000 title 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes
-
- 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
- H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
- H03B5/1841—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a strip line resonator
- H03B5/1847—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a strip line resonator the active element in the amplifier being a semiconductor device
-
- 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
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/326—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator the resonator being an acoustic wave device, e.g. SAW or BAW device
-
- 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
- H03D7/125—Transference of modulation from one carrier to another, e.g. frequency-changing by means of semiconductor devices having more than two electrodes with field effect transistors
-
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6403—Programmable filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
- H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
- H03J5/0254—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being transfered to a D/A converter
-
- 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
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/362—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device the amplifier being a single transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14502—Surface acoustic wave [SAW] transducers for a particular purpose
- H03H9/14508—Polyphase SAW transducers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/813,202 US4162451A (en) | 1977-07-05 | 1977-07-05 | MESFET-device surface-wave-device channel selector |
US05/813,137 US4162452A (en) | 1977-07-05 | 1977-07-05 | Channel selection for a television receiver having low-gain high frequency RF-IF section |
US05/813,198 US4408347A (en) | 1977-07-29 | 1977-07-29 | High-frequency channel selector having fixed bandpass filters in the RF section |
Publications (1)
Publication Number | Publication Date |
---|---|
BR7804326A true BR7804326A (pt) | 1979-04-03 |
Family
ID=27420087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR7804326A BR7804326A (pt) | 1977-07-05 | 1978-07-05 | Dispositivo para filtrar um canal de frequencia,receptor de televisao aperfeicoado,e seletor de canais |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5418208A (fr) |
BR (1) | BR7804326A (fr) |
CA (1) | CA1110356A (fr) |
DE (1) | DE2829538A1 (fr) |
FR (1) | FR2408944B1 (fr) |
GB (1) | GB2000926B (fr) |
NL (1) | NL7807307A (fr) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5776935A (en) * | 1980-10-29 | 1982-05-14 | Matsushita Electric Ind Co Ltd | Tuner |
JPS587934A (ja) * | 1981-07-07 | 1983-01-17 | Matsushita Electric Ind Co Ltd | チャンネルコンバ−タ装置 |
US4397037A (en) * | 1981-08-19 | 1983-08-02 | Rca Corporation | Diplexer for television tuning systems |
US4408348A (en) * | 1981-08-19 | 1983-10-04 | Rca Corporation | Multiband tuning system for a television receiver |
JPS58179005A (ja) * | 1982-04-14 | 1983-10-20 | Toshiba Corp | コンバ−タ装置 |
DE3821716A1 (de) * | 1988-06-28 | 1990-01-04 | Telefunken Electronic Gmbh | Fernsehtuner mit einer bandfilterschaltung |
DE3821715A1 (de) * | 1988-06-28 | 1990-01-04 | Telefunken Electronic Gmbh | Eingangsschaltung eines fernsehtuners |
US5175711A (en) * | 1988-10-03 | 1992-12-29 | Hitachi, Ltd. | Surface acoustic wave apparatus and method of productivity and adjustment of the same |
JP2685537B2 (ja) * | 1988-10-03 | 1997-12-03 | 株式会社日立製作所 | 弾性表面波装置、その製作方法、その調整方法、及びそれを用いた通信装置 |
DE4228834A1 (de) * | 1992-08-29 | 1994-03-03 | Thomson Brandt Gmbh | Verfahren und Vorrichtung zum Abgleich einer PLL Stufe |
DE4332161A1 (de) * | 1993-09-22 | 1995-03-23 | Thomson Brandt Gmbh | Hochfrequenzempfänger |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1142631B (de) * | 1959-07-15 | 1963-01-24 | Loewe Opta Ag | Fernsehempfangsschaltung |
US3686518A (en) * | 1970-09-02 | 1972-08-22 | Clinton S Hartmann | Unidirectional surface wave transducers |
US3787612A (en) * | 1972-07-03 | 1974-01-22 | Zenith Radio Corp | Signal processing system for television receiver having acoustic surface wave devices for improved tuning and video demodulation |
DE2334570B1 (de) * | 1973-07-07 | 1975-03-06 | Philips Patentverwaltung | Abstimmbare Hochfrequenz-Eingangsschaltungsanordnung fuer einen Fernsehempfaenger |
US3946342A (en) * | 1973-08-10 | 1976-03-23 | Texas Instruments Incorporated | Weighting surface wave filters by withdrawing electrodes |
GB1440950A (en) * | 1973-10-12 | 1976-06-30 | Mullard Ltd | Acoustic surface-wave devices |
FR2263635A1 (en) * | 1974-03-05 | 1975-10-03 | Oak Holland Bv | High stability frequency converter - uses three mixing circuits and a quartz controlled pilot oscillator |
US3942120A (en) * | 1974-07-22 | 1976-03-02 | Texas Instruments Incorporated | SWD FM receiver circuit |
US3946338A (en) * | 1975-06-09 | 1976-03-23 | Bell Telephone Laboratories, Incorporated | Acoustic wave devices involving perturbation of acoustic velocity by diffusion of metals |
-
1978
- 1978-06-09 GB GB7826602A patent/GB2000926B/en not_active Expired
- 1978-06-22 CA CA305,989A patent/CA1110356A/fr not_active Expired
- 1978-07-05 JP JP8249678A patent/JPS5418208A/ja active Granted
- 1978-07-05 DE DE19782829538 patent/DE2829538A1/de not_active Ceased
- 1978-07-05 NL NL7807307A patent/NL7807307A/xx not_active Application Discontinuation
- 1978-07-05 BR BR7804326A patent/BR7804326A/pt unknown
- 1978-07-05 FR FR7819988A patent/FR2408944B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2408944B1 (fr) | 1985-12-06 |
CA1110356A (fr) | 1981-10-06 |
DE2829538A1 (de) | 1979-01-25 |
FR2408944A1 (fr) | 1979-06-08 |
NL7807307A (nl) | 1979-01-09 |
GB2000926A (en) | 1979-01-17 |
JPS5418208A (en) | 1979-02-10 |
GB2000926B (en) | 1982-04-28 |
JPH0121648B2 (fr) | 1989-04-21 |
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