US2058565A - Wave signal receiver - Google Patents

Wave signal receiver Download PDF

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Publication number
US2058565A
US2058565A US7169A US716935A US2058565A US 2058565 A US2058565 A US 2058565A US 7169 A US7169 A US 7169A US 716935 A US716935 A US 716935A US 2058565 A US2058565 A US 2058565A
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US
United States
Prior art keywords
receiver
output
audio
carrier wave
frequency
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
Application number
US7169A
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English (en)
Inventor
Nelson P Case
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.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine 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
Application filed by Hazeltine Corp filed Critical Hazeltine Corp
Priority to US7169A priority Critical patent/US2058565A/en
Priority to AT155679D priority patent/AT155679B/de
Priority to DE1936H0146586 priority patent/DE691563C/de
Priority to FR802104D priority patent/FR802104A/fr
Application granted granted Critical
Publication of US2058565A publication Critical patent/US2058565A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H03G3/24—Control dependent upon ambient noise level or sound level
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes

Definitions

  • My invention relates to wave signal receivers and, while it is of general application, it is particularly suitable for embodiment in radio broadcast receivers for use in automobiles or other vehicles.
  • a wave signal receiver including an audio-frequency amplifler, is provided with means for controlling the amplification of one or more of the amplifying or converting stages preceding the audio-frequency ampliferin inverse relation to the coeilicient of modulation of the carrier wave being received and for simultaneously controlling the amplication of one or more of such stages in inverse relation to the intensity of the carrier wave.
  • a rectiiier circuit is connected to be energized from the output of the audio-frequency amplifier and to develop a biasing voltage varying in accordance with the output of the audio-frequency amplifier.
  • This biasing voltage is applied to the amplification control electrodes of one or more of the preceding amplifying or converting tubes of the receiver.
  • a biasing voltage derived from the detector circuit is applied to the amplification control electrodes of one or more of the preceding tubes to assist in maintaining ,the volume output within desired limits, land. to minimize noises produced when the receiver is tuned toan unmodulated carrier wave.
  • Fig. 1 is a circuit diagram of a complete radio broadcast receiver embodying my invention in which certain conventional portionsare indicated schematically since, per se, they form no part of my present invention
  • Fig. 2 is la circuit diagram of a receiver similar to that of Fig. l but including a modified form of my invention
  • Figs. 3 and 4 are curves showing certain operating characteristics of a typical broadcast receiver embodying my invention.
  • Fig. 1 of the drawings there is shown diagrammatically a complete broadcast receiver embodying my in- I stages, such as a radio-frequency amplifier l2,
  • the intermediate-frequency amplitler Il is coupled Vby means of atuned coupling transformer I5 to a connection.
  • the detector circuit just vdescribed is coupled to the amplifier section of the tube I6 through the adjustable connection I8a. and a blocking coil 29 of a loudspeaker 30.
  • which is connected to the amplification control electrode or grid I6d.
  • a leak resistor-24 is connected from the grid I6d to ground to completethe direct-current circuit between grid and cathode.
  • a biasing resistor 22 may be included in the connection from the cathode I6c to ground, preferably by-passed by a condenser 23.
  • the output of the amplifier section of the tube I6 is coupled by means of a resistor 25 to the input section of an audio frequency amplifier 21, the other terminal of the resistor 25 being connected to any suitable source of unidirectional voltage, as indicated by the symbol +B.'
  • A'radiofrequency by-pass condenser 26 is connected between the anode
  • the output of the audio-frequency amplifier 21 is fed through an audio-frequency transformer 28 to the moving A condenser 3
  • the iield 32 of the loudspeaker 30 may be energized from any suitable source' of uni-directionalv voltage.
  • negative biasing voltages varying in relation to the intensity of the carrier are impressed upon the amplification control electrodes of one or more of the vacuum tubes of the: radio-frequencyA amplifier I2, the oscillator-modulator I3, and the intermediatefrequency amplifier I4.
  • the connections 33, 34 and 35 to the amplification control electrodes of the tubes of the stages I2, I3 and I4, respectively are supplied with biasing voltages by connection to suitable points of a voltage divider circuit comprising serially connected resistors 39, 40, 4
  • This voltage divider circuit is effectively connected across the resistor IB from which is derived a unidirectional voltage varying withthe intensity of the carrier wave being received.
  • the relative values .of the several resistors of the voltage divider circuit determine the portions of the volume control that are effected in the several stages..
  • Filtering resistors 36 and'condensers 31 are preferably included in one or more of the connections 33, 34 and 35.
  • the apparatus tl'ius far described is essentially a conventional radio broadcast-receiver of the superheterodyne type provided with automatic amplification control, and its operation need not be described in detail.
  • signal-modulated carrier waves impressed upon the input circuit Il! are amplified by the tuned radio-frequency amplifier I2, the output of which is imized to modulate the carrier Wave, producing a difference frequency or intermediate frequency which is impressed upon, and amplified by, one
  • the detector current owing through the resistor I8 develops thereacross a biasing potential the polarity of which is such that the upper terminal of this resistor is negative ⁇ with respect to its lower terminal, Which is connected to ground through the resistor 22.
  • 'I'his negative biasing voltage varies in magnitude in accordance with the amplitude of the carrier wave .being received and is impressed upon the amplification cit'rl electrodes of one or more of the tubes of the amplifying or converting stages I2, I3 and I4 whereby their amplification or conversion gain is varied in inverse relation to the amplitude of the carrier wave being received.
  • Fig. 2 is shown diagrammatically a broadcast receiver similar to that 0f Fig. '1, but including fa. modified form of my invention.
  • the circuit is the same as that of Fig. 1 and corresponding elements thereof are identified by the same reference characters.
  • the additional biasing voltage for controlling the amplification of one or more of the amplifying or converting stages preceding the detector is derived from a voltage divider 43 connected across the output of the amplifier 21 and provided with an adjustable contact 43a.
  • the adjustable contacts I8a andl 43a are mechanically interconnected by a uni-control def vice to be operated simultaneously but in opposite senses; that is, in case the adjustable contact I8a is moved upwardly to increase the volume output of the receiver, the adjustable contact -43a is moved downwardly to decrease the portion of the output voltage of ⁇ the amplifier 21 impressed between the electrodes I6b and I6c of the tubev I6.
  • the biasing voltage derived from the carrier and that derived from the output of the audio-frequency ampliiier are not combined to control the amplication of each of the several stages, but the automatic volume control bias voltage derived from the resistor I8 is applied to the amplication control electrode of only one of the stages,
  • the intermediate-frequency amplifier I4 for example, the intermediate-frequency amplifier I4; while the automatic volume control bias- ⁇ bias voltages, but embraces any of the many combinations thereof jointly to control the amplification or conversion of the signal in the several stages of the receiver.
  • Condenser 37 ...'microarad-- 0.03 Condenser 38 dn 0.003 Condenser 42 ...,-1 do 0.1 Resistor' 39----. L... --megohm 1 Resistor 40 do 0.5 Resistor 41 do 0.5
  • 'rse relative magnitudes ,er resistere is, asa. fm, ne, 1
  • the curves of Fig. 3 show the audio-frequency output of a typical receiver, for an input of 100 micro-volts, as a function of the modulation percentage both with and without the embodiment of my invention.
  • the dashed curves A, B and C represent the characteristics of a receiver without my invention for three different settings of the volume control I8a', while the solid curves A', B and C represent those of a receiver modied in accordance with my invention, with the volume control
  • detector coupled to said amplifier, aresistor con ⁇ tector, a condenser and a second resistor leectively connected in series across the output circuit of said audio-frequency amplifier, a rectifier connected in circuit with said second resistor Whereby there is developed across said second resistor a unidirectional voltage varying in accordance with the output of said audio-frequency amplifier, and a circuit for applying said last-named unidirectional voltage as a bias to said control electrode.
  • a carrier-frequency amplifier a detector, and an audio-frequency amplifier connected in cascade
  • means for adjusting the output level of said audio-frequency amplifier means for compensating for variations in the coefiicient of modulation of a carrier wave comprising adjustable means for controlling the amplification of said carrier-frequency amplifier in inverse relation to the vamplitude of the output of said audio-frequency amplifier, and unicontrol means for simultaneously adjusting said output level adjusting means and said amplification control means.
  • a carrier-frequency amplifier tube having an amplification control electrode.
  • a detector coupled to said amplifier tube, an audiofrequency amplifier, an adjustable coupling between said detector and said audio-frequency amplifier, means for compensating for variations in the coefficient of modulation of a carrier wave comprising a voltage divider effectively connected across the output of said audio-frequency amplifier, means for deriving a unidirectional biasing voltage from said voltage divider and impressing it on said control electrode, and unicontrol means for simultaneously adjusting said voltage divider and said adjustable coupling.
  • a carrier-frequency amplifier tube having an amplification control electrode, a detector coupled to said amplifier, a signal-frequency amplifier, an adjustable'coupling between variations in the coefcient of modulation of a carrier wave comprising a voltage divider effectively connectedacross the output of said signalfrequency amplifier and provided with an adjustable connection, means for deriving a unidirectional voltage from said voltage divide.' and impressing it negatively on said control elfctrode, and unicontrol means lfor adjusting the connection of said adjustable coupling in a sense to increase the coupling and for adjusting the connection of said voltage divider in a sense to decrease said unidirectional voltage, and vice-versa.
  • a superheterodyne receiver including a plurality of signal-translating stages, a detector, and an audio-frequency amplifier connected in cascade, meansfor adjustingthe output level of said audio-frequency amplifier, means for compensating for variations in the coeiiicient of modulation of a carrier wave comprising adjustable means for controlling the amplification of at least one of said signal-translating stages in inverse relation to the output of -said audio-frequency amplifier, and unicontrol means for simultaneously adjusting said output level adjusting means and said amplification control means.
  • means for compensating for variations in intensity of received carrier waves comprising means for controlling -the amplification of said carrier-frequency amplifier in inverse relation to the intensity of the carrier wave, means for adjusting the output level of said audiofrequency amplifier, means for compensating for variations in the coeiiicient of modulation of a carrier wave comprising adjustable means for controlling the amplification of said carrierfrequency amplifier in inverse relation to the amplitude of the output of said audio-frequency amplifier, and unicontrol means for simultaneously adjusting said output level adjusting means and said last-mentioned amplification control

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
US7169A 1935-02-19 1935-02-19 Wave signal receiver Expired - Lifetime US2058565A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US7169A US2058565A (en) 1935-02-19 1935-02-19 Wave signal receiver
AT155679D AT155679B (de) 1935-02-19 1936-02-14 Schaltung zum Empfang und/oder zur Verstärkung elektrischer Schwingungen.
DE1936H0146586 DE691563C (de) 1935-02-19 1936-02-14 Schaltung zum Empfang und/oder zur Verstaerkung elektrischer Schwingungen
FR802104D FR802104A (fr) 1935-02-19 1936-02-18 Récepteur de radio-diffusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7169A US2058565A (en) 1935-02-19 1935-02-19 Wave signal receiver

Publications (1)

Publication Number Publication Date
US2058565A true US2058565A (en) 1936-10-27

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ID=21724613

Family Applications (1)

Application Number Title Priority Date Filing Date
US7169A Expired - Lifetime US2058565A (en) 1935-02-19 1935-02-19 Wave signal receiver

Country Status (4)

Country Link
US (1) US2058565A (fr)
AT (1) AT155679B (fr)
DE (1) DE691563C (fr)
FR (1) FR802104A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441577A (en) * 1943-04-17 1948-05-18 Katzin Martin Automatic volume control means
US2498730A (en) * 1944-06-27 1950-02-28 Int Standard Electric Corp Thermionic amplifier circuit
US2540643A (en) * 1940-01-12 1951-02-06 Edwin H Armstrong Frequency-modulated carrier signal receiver
US2854630A (en) * 1953-04-21 1958-09-30 Jr Arvid E Fogelberg Peak detection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540643A (en) * 1940-01-12 1951-02-06 Edwin H Armstrong Frequency-modulated carrier signal receiver
US2441577A (en) * 1943-04-17 1948-05-18 Katzin Martin Automatic volume control means
US2498730A (en) * 1944-06-27 1950-02-28 Int Standard Electric Corp Thermionic amplifier circuit
US2854630A (en) * 1953-04-21 1958-09-30 Jr Arvid E Fogelberg Peak detection

Also Published As

Publication number Publication date
AT155679B (de) 1939-03-10
DE691563C (de) 1940-05-30
FR802104A (fr) 1936-08-28

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