US2083239A - Tuning control - Google Patents

Tuning control Download PDF

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Publication number
US2083239A
US2083239A US34572A US3457235A US2083239A US 2083239 A US2083239 A US 2083239A US 34572 A US34572 A US 34572A US 3457235 A US3457235 A US 3457235A US 2083239 A US2083239 A US 2083239A
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United States
Prior art keywords
oscillator
receiver
detector
intermediate frequency
tuning
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 - Lifetime
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US34572A
Inventor
Oosterhuis Ekko
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
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Publication of US2083239A publication Critical patent/US2083239A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/12—Electrically-operated arrangements for indicating correct tuning

Definitions

  • this visible tuning control has the drawback, that it requires more attention on the part of the operator of the receiver.
  • the present invention has for its purpose to 5 provide a radio-receiving set with automatic volume control, measures being taken which allow tuning by ear.
  • this is achieved by coupling an oscillator with the high or interme- 0 diate frequency amplifier of the receiver, said oscillator being tuned to the same wave length as the high or the intermediate frequency amplifier.
  • the intermediate frequency is determined either by the difference or the sum of the received carrier frequency and the frequency of the oscillations generated by the local superheterodyne oscillator.
  • the tuning means of the high frequency arrangement preceding the first detector are mechanically coupled with the tuning means of the superheterodyne oscillator, so that upon detuning of the receiver relatively to the carrier wave to be received, the intermediate frequency supplied to the intermediate frequency amplifier depends on the frequency to which the intermediate frequency amplifier. is tuned.
  • an oscillator is coupled with the intermediate frequency amplifier, which oscillator is tuned to the same frequency as the intermediate frequency amplifier, a low frequency interference tone occurs at a slight detuning of the receiver in the output of the second detector,thi s interference tone manifesting itself in the loudspeaker.
  • the occurrence of such a tone intimates that the tuning of the receiver should be altered in the direction of the low tones until it disappears.
  • the oscillator may be disconnected.
  • the receiver comprises a high frequency amplifier I, a first detector 2, with which a superheterodyne oscillator 3 is coupled in a known manner, an intermediate frequency amplifier 4, a rectifier 5 with a succeeding low frequency amplifier 6 and finally, a loudspeaker 1.
  • the input circuit of the second detector 5 is coupled with an oscillator 8 which is tuned to the same frequency as the intermediate frequency amplifier.
  • the automatic volume control is represented conventionally, and is designated by the letters AVC.
  • the oscillator 8 may be disconnected from the input of the second detector by reducing the coupling between coils 5 and 8', as denoted by the arrow 9, when the'beat note has disappeared.
  • a superheterodyne receiver of the type comprising a converter, intermediate frequency amplifier, second detector, audio reproducer network and an automatic volume control network for reducing the gain of at least one stage ahead of the second detector as the received signal amplitude increases
  • an arrangement for securing accurate tuning of the receiver which includes a local oscillator coupled to said second detector input for impressing on the latter waves of a frequency equal to the frequency of the intermediate frequency energy fed to the second detector input, whereby an audible beat note is produced by the reproducer network when the receiver is slightly de-tuned with respect to a desired signal carrier frequency, and means for rendering the oscillator inoperative to impress waves on the detector input when the receiver has been tuned to said carrier and the beat note has disappeared.

Description

Patented June 8 1937 PATENT OFFICE TUNING CONTROL Ekko Ousterhuis, Eindhoven, Netherlands, as-
signor to N. V. Philips Gloellampenfabrieken, Eindhoven, Netherlands 7 Application August 3, 1935, Serial No. 34,572 In Germany August 16, 1934 1 Claim.
10 er to be accurately tuned to the carrier wave to be received, this visible tuning control has the drawback, that it requires more attention on the part of the operator of the receiver.
The present invention has for its purpose to 5 provide a radio-receiving set with automatic volume control, measures being taken which allow tuning by ear.
According to the invention this is achieved by coupling an oscillator with the high or interme- 0 diate frequency amplifier of the receiver, said oscillator being tuned to the same wave length as the high or the intermediate frequency amplifier.
With superheterodyne receivers, as is well known, the intermediate frequency is determined either by the difference or the sum of the received carrier frequency and the frequency of the oscillations generated by the local superheterodyne oscillator. With modern receivers the tuning means of the high frequency arrangement preceding the first detector are mechanically coupled with the tuning means of the superheterodyne oscillator, so that upon detuning of the receiver relatively to the carrier wave to be received, the intermediate frequency supplied to the intermediate frequency amplifier depends on the frequency to which the intermediate frequency amplifier. is tuned.
When according to the invention an oscillator is coupled with the intermediate frequency amplifier, which oscillator is tuned to the same frequency as the intermediate frequency amplifier, a low frequency interference tone occurs at a slight detuning of the receiver in the output of the second detector,,thi s interference tone manifesting itself in the loudspeaker. The occurrence of such a tone intimates that the tuning of the receiver should be altered in the direction of the low tones until it disappears. When this point has been reached so that the receiver is accurately adjusted, the oscillator may be disconnected. The advantage of this arrangement is that the tuning can be effected by ear independently of the operation of the automatic volume control.
The invention will be more clearly understood with reference to the accompanying drawing by means of which the circuit arrangement, according to the invention, will be explained in a superheterodyne receiver. The receiver comprises a high frequency amplifier I, a first detector 2, with which a superheterodyne oscillator 3 is coupled in a known manner, an intermediate frequency amplifier 4, a rectifier 5 with a succeeding low frequency amplifier 6 and finally, a loudspeaker 1.
According to the invention the input circuit of the second detector 5 is coupled with an oscillator 8 which is tuned to the same frequency as the intermediate frequency amplifier. The automatic volume control is represented conventionally, and is designated by the letters AVC. The oscillator 8 may be disconnected from the input of the second detector by reducing the coupling between coils 5 and 8', as denoted by the arrow 9, when the'beat note has disappeared.
What I claim is: In a superheterodyne receiver of the type comprising a converter, intermediate frequency amplifier, second detector, audio reproducer network and an automatic volume control network for reducing the gain of at least one stage ahead of the second detector as the received signal amplitude increases, an arrangement for securing accurate tuning of the receiver which includes a local oscillator coupled to said second detector input for impressing on the latter waves of a frequency equal to the frequency of the intermediate frequency energy fed to the second detector input, whereby an audible beat note is produced by the reproducer network when the receiver is slightly de-tuned with respect to a desired signal carrier frequency, and means for rendering the oscillator inoperative to impress waves on the detector input when the receiver has been tuned to said carrier and the beat note has disappeared.
EKKO OOSTERHUIS.
US34572A 1934-08-16 1935-08-03 Tuning control Expired - Lifetime US2083239A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2083239X 1934-08-16

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US2083239A true US2083239A (en) 1937-06-08

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US34572A Expired - Lifetime US2083239A (en) 1934-08-16 1935-08-03 Tuning control

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US (1) US2083239A (en)
FR (1) FR792399A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926304A (en) * 1958-04-21 1960-02-23 Itt Frequency determining system
US4475245A (en) * 1982-02-17 1984-10-02 Trio Kabushiki Kaisha Transceiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926304A (en) * 1958-04-21 1960-02-23 Itt Frequency determining system
US4475245A (en) * 1982-02-17 1984-10-02 Trio Kabushiki Kaisha Transceiver

Also Published As

Publication number Publication date
FR792399A (en) 1935-12-30

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