GB1281061A - Channel selector and tuner combination - Google Patents

Channel selector and tuner combination

Info

Publication number
GB1281061A
GB1281061A GB4229869A GB4229869A GB1281061A GB 1281061 A GB1281061 A GB 1281061A GB 4229869 A GB4229869 A GB 4229869A GB 4229869 A GB4229869 A GB 4229869A GB 1281061 A GB1281061 A GB 1281061A
Authority
GB
United Kingdom
Prior art keywords
channel
circuits
channels
tuning
diode
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
Application number
GB4229869A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to JP43062206A priority Critical patent/JPS4821169B1/ja
Priority to JP7207268A priority patent/JPS4828561B1/ja
Priority to JP7207368A priority patent/JPS4828562B1/ja
Priority to JP7210468 priority
Priority to JP8886568A priority patent/JPS4814361B1/ja
Priority to JP1309969 priority
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of GB1281061A publication Critical patent/GB1281061A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00Discontinuous 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
    • H03J5/02Discontinuous 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
    • H03J5/0218Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, by selecting the corresponding analogue value between a set of preset values
    • H03J5/0227Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, by selecting the corresponding analogue value between a set of preset values using a counter

Abstract

1281061 Tuning circuits; gating circuits; colour television MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 25 Aug 1969 [30 Aug 1968 1 Oct 1968 (2) 3 Oct 1968 4 Dec 1968 21 Feb 1969] 42298/69 Headings H3Q H3T and H4F [Also in Division G4] A channel selector controls a tuner having variable capacitance diodes as tuning elements by means of n signals of binary "1" or "0" to select one of 2<SP>n</SP> channels. As shown in Fig. 12 the binary code required is set up in bi-stable circuits 95-98 so that one column of diodes of the diode matrix 151 are biased off, such as column 1, whereas at least one diode in each of thr other column is biased on. This biases the diode 108 connected to column 1 on so that the voltage set by potentiometer 88 is applied to tune the capacitance diodes 84-87 of a colour television to channel 1. The diodes 109-114 connected to the other columns of the diode matrix 151 are biased off. The channel selected is indicated by a lamp, neon or number indicating tube controlled by a transistor 52 associated with the selected channel. A pulse generator or astable multivibrator 137 is started by closing switch 139 and the bi-stable circuits 95-98 then count the output pulses from generator 137 so as to alter the code stored in the bi-stable circuits and sequentially change the channels until the required channel is obtained. The channels may be sequentially tuned in either direction by means of change-over switch 147- 150 or by a change-over switch (153-155, Fig. 15, not shown), interchanging the input-output connections between the bi-stable circuits 95- 98. Channel selection can be obtained by pressing a push button and remote control may be achieved by applying a coded pulse train to the bi-stable circuit 95. In a modification (Fig. 10, not shown), where the television has a monitor Braun tube (135, Fig. 9, not shown) and a colour telecast indicator (136) if when the channels are being sequentially selected by the operation of the pulse generator 137 a selected channel is telecasting in colour a signal is picked up from the mixer 82 and is detected by a diode 145. This detected signal in the form of the colour carrier signal is passed via a video amplifier 144 to operate a transistor 142 which turns on an indicator lamp 141 during telecast reception and turns this lamp off when the telecast is interrupted. The television signals broadcasting on the different channels are monitored on the monitor picture tube (135). The number of channels to be selected may be varied by varying the number of stages of the counter 95-98 or by applying negative feedback. In an alternative embodiment (Fig. 16) the channel selector is formed as an integrated circuit 160 having an integrated circuit 169 for applying output 168 to the channel indicators and having a frequency discriminator circuit 158 for effecting AFC. To match the integrated circuit to the receiver a trimmer capacitor may be provided. Motor driven tuning (Fig. 5).-The channel selected corresponds to a frequency f 1 -f 4 selected from an oscillator 51 which is received at 52 and tuned by circuits 53. On rotation of a motor 59, each time a different number is indicated on a dial 58 the contacts 63 open and close to produce a pulse input for bi-stable circuits 66-69. When the outputs from the bi-stable circuits 66-69 and from the tuning circuits 53 produce a zero output from the comparator C1-C4 transistor 61 cuts off to stop the motor 59. The selected tuning voltage is applied to the variable capacitance diodes of the tuner via 72 and 77. Waveband switching between high and low VHF bands may be obtained by a switching diode by means of a waveband switch 79. In a prior art circuit described (Fig. 2, not shown), when an ultrasonic signal is received at (17) it switches on a transistor (20) which operates a relay 23 controlling a tuning motor 11.
GB4229869A 1968-08-30 1969-08-25 Channel selector and tuner combination Expired GB1281061A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP43062206A JPS4821169B1 (en) 1968-08-30 1968-08-30
JP7207268A JPS4828561B1 (en) 1968-10-01 1968-10-01
JP7207368A JPS4828562B1 (en) 1968-10-01 1968-10-01
JP7210468 1968-10-03
JP8886568A JPS4814361B1 (en) 1968-12-04 1968-12-04
JP1309969 1969-02-21

Publications (1)

Publication Number Publication Date
GB1281061A true GB1281061A (en) 1972-07-12

Family

ID=27548443

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4229869A Expired GB1281061A (en) 1968-08-30 1969-08-25 Channel selector and tuner combination

Country Status (4)

Country Link
DE (1) DE1944067C3 (en)
FR (1) FR2016659A1 (en)
GB (1) GB1281061A (en)
NL (1) NL152725B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2522247A1 (en) * 1974-05-20 1975-11-27 Matsushita Electric Ind Co Ltd CHANNEL SELECTION

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2043259A1 (en) * 1969-04-14 1971-02-12 Matsushita Electric Ind Co Ltd
JPS503883B1 (en) * 1969-04-16 1975-02-12
GB1316871A (en) * 1969-05-20 1973-05-16 Matsushita Electric Ind Co Ltd Tuning system for selecting channels
DE2026107C3 (en) * 1969-05-29 1975-05-15 Rca Corp
DE2019376B2 (en) * 1970-04-22 1978-04-13 Standard Elektrik Lorenz Ag, 7000 Stuttgart
DE2028400B2 (en) * 1970-06-09 1978-04-27 Standard Elektrik Lorenz Ag, 7000 Stuttgart
JPS5119921B1 (en) * 1970-11-28 1976-06-21
JPS515883B1 (en) * 1970-12-18 1976-02-24
DE2107714C3 (en) * 1971-02-18 1981-08-06 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co Kg, 8510 Fuerth, De
JPS5234162B2 (en) * 1972-04-27 1977-09-01
DE2221773C2 (en) * 1972-05-04 1979-04-05 Loewe Opta Gmbh, 1000 Berlin
JPS5338041B2 (en) * 1973-03-29 1978-10-13
DE2330739C2 (en) * 1973-06-16 1982-03-04 Philips Patentverwaltung Gmbh, 2000 Hamburg, De
JPS5637728B2 (en) * 1974-07-05 1981-09-02

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2553366A (en) * 1949-06-15 1951-05-15 Pye Ltd Crystal controlled high-frequency oscillator
US3079462A (en) * 1958-07-21 1963-02-26 Rosenthal Walter Television receiver with picture selector device
US3264566A (en) * 1962-07-13 1966-08-02 Gen Instrument Corp Electronic switching of tuned circuits
FR1431746A (en) * 1965-01-21 1966-03-18 Thomson Houston Comp Francaise Improvements to active electric filters
US3287494A (en) * 1966-02-17 1966-11-22 Motorola Inc Indicator for color television receivers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2522247A1 (en) * 1974-05-20 1975-11-27 Matsushita Electric Ind Co Ltd CHANNEL SELECTION

Also Published As

Publication number Publication date
DE1944067C3 (en) 1973-01-04
NL152725B (en) 1977-03-15
DE1944067B2 (en) 1972-06-22
NL6913222A (en) 1970-03-03
DE1944067A1 (en) 1970-03-05
FR2016659A1 (en) 1970-05-08

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Legal Events

Date Code Title Description
PS Patent sealed
49R Reference inserted (sect. 9/1949)
PE20 Patent expired after termination of 20 years