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US3167614A - Multiplicative stereophonic sound signalling system - Google Patents

Multiplicative stereophonic sound signalling system Download PDF

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Publication number
US3167614A
US3167614A US799680A US79968059A US3167614A US 3167614 A US3167614 A US 3167614A US 799680 A US799680 A US 799680A US 79968059 A US79968059 A US 79968059A US 3167614 A US3167614 A US 3167614A
Authority
US
United States
Prior art keywords
signal
carrier wave
channel
modulation
signals
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
US799680A
Other languages
English (en)
Inventor
Francis R Holt
Avins Jack
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.)
RCA Corp
Original Assignee
RCA 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 DENDAT1252283D priority Critical patent/DE1252283B/de
Application filed by RCA Corp filed Critical RCA Corp
Priority to US799680A priority patent/US3167614A/en
Priority to GB7616/60A priority patent/GB946562A/en
Priority to BE588627A priority patent/BE588627A/fr
Priority to NL249448D priority patent/NL249448A/xx
Priority to DE19601441835 priority patent/DE1441835B2/de
Priority to SE2668/60A priority patent/SE300017B/xx
Priority to FR821517A priority patent/FR1259065A/fr
Application granted granted Critical
Publication of US3167614A publication Critical patent/US3167614A/en
Priority to SE2622/68A priority patent/SE310374B/xx
Priority to NL7104525A priority patent/NL7104525A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
    • H04H20/49—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for AM stereophonic broadcast systems

Definitions

  • the present invention relates to new and improved apparatus for the transmission and reception of sterophonic sound signal information and, more particularly, to such apparatus capable of operation in compatibility with existing amplitude modulation (AM) radio broadcasts and receivers and AM bandwidth standards.
  • AM amplitude modulation
  • Another object of the present invention is to provide a new and improved stereophonic signal transmitter capable of producing and transmitting within the standard AM broadcast channel band a stereophonic signal which may be received and reproduced stereophonically in a stereophonic receiver or monophonically by a standard AM broadcast receiver.
  • the (A+B) signal is amplified by successive audio amplification stages 30 and 32 and is, in turn, suitably applied, as by a cathode follower circuit 34, to the amplitude modulator 23 wherein it serves to amplitude modulate the frequency modulated carrier wave.
  • FIG. 3 further illustrates, in accordance with the present invention, an FM channel connected to receive the intermediate frequency signal from the common IF amplifier 52 via a lead 60.
  • the FM channel the purpose of which is to recover the (A -B) information from the received carrier wave, comprises an FM detector circuit 62, with suitable limiting action to be described more fully hereinafter, and a deemphasis circuit 64.
  • the circuit 64 has a deemphasis characteristic which complements the preemphasis characteristic described in connection with the transmitter of FIG. 2.
  • the circuit 64 serves to remove the preemphasis of the (A -B) signal at audio frequencies, rendering it a substantial replica of the (A .B) signal applied to the preemphasis circuit 22 at the transmitter.
  • the deemphasized (A -B) signal is amplified in an audio amplifier 68 and applied to a second terminal of the matrix circuit 58.
  • An ordinary AM receiver with conventional AGC action ⁇ such as that illustrated in FIG. 3, does not have a flat input-output characteristic. Rather, its characteristic is of gradual slope, such as is shown by the curve 74 in FIG. 4, which curve represents a plot of the AM detector output as a function of the RF input to the receiver, with normal AGC action.
  • the -B signal from the terminal 124 and the A signal from the terminal are also coupled, respectively, to the control electrode 136 of an adder tube 138, so that the input signal to that tube is the (A -B) signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Transmitters (AREA)
US799680A 1959-03-16 1959-03-16 Multiplicative stereophonic sound signalling system Expired - Lifetime US3167614A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DENDAT1252283D DE1252283B (es) 1959-03-16
US799680A US3167614A (en) 1959-03-16 1959-03-16 Multiplicative stereophonic sound signalling system
GB7616/60A GB946562A (en) 1959-03-16 1960-03-03 Stereophonic radio signal receiver
BE588627A BE588627A (fr) 1959-03-16 1960-03-14 Dispositif de signalisation sonore stéréophonique multiplicatif.
NL249448D NL249448A (es) 1959-03-16 1960-03-15
DE19601441835 DE1441835B2 (de) 1959-03-16 1960-03-15 Empfaenger fuer mit einem stereosignal und einem pilotton modulierte elektrische hochfrequenzschwingungen
SE2668/60A SE300017B (es) 1959-03-16 1960-03-16
FR821517A FR1259065A (fr) 1959-03-16 1960-03-16 Dispositif pour l'émission et la réception de signaux acoustiques stéréophoniques
SE2622/68A SE310374B (es) 1959-03-16 1968-02-29
NL7104525A NL7104525A (es) 1959-03-16 1971-04-05

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US799680A US3167614A (en) 1959-03-16 1959-03-16 Multiplicative stereophonic sound signalling system

Publications (1)

Publication Number Publication Date
US3167614A true US3167614A (en) 1965-01-26

Family

ID=25176496

Family Applications (1)

Application Number Title Priority Date Filing Date
US799680A Expired - Lifetime US3167614A (en) 1959-03-16 1959-03-16 Multiplicative stereophonic sound signalling system

Country Status (7)

Country Link
US (1) US3167614A (es)
BE (1) BE588627A (es)
DE (2) DE1441835B2 (es)
FR (1) FR1259065A (es)
GB (1) GB946562A (es)
NL (2) NL249448A (es)
SE (2) SE300017B (es)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2323658A1 (de) 1972-05-10 1973-11-29 Kahn Leonard R Stereophones uebertragungs- und empfangssystem und -verfahren
US3908090A (en) * 1972-05-10 1975-09-23 Leonard R Kahn Compatible AM stereophonic transmission system
US3944749A (en) * 1972-05-10 1976-03-16 Kahn Leonard R Compatible AM stereophonic receivers involving sideband separation at IF frequency
DE2911487A1 (de) * 1978-03-27 1979-10-11 Ray Milton Dolby Fm-stereophonie-empfangs-schaltungsanordnung
US4218586A (en) * 1976-04-07 1980-08-19 Motorola, Inc. Compatible AM stereo broadcast system
WO1981002822A1 (en) * 1980-03-24 1981-10-01 Motorola Inc Am stereophonic decoder
US4302626A (en) * 1977-03-21 1981-11-24 Magnavox Consumer Electronics Company Low frequency AM stereophonic broadcast and receiving apparatus
US4332978A (en) * 1977-03-21 1982-06-01 The Magnavox Consumer Electronics Co. Low frequency AM stereophonic broadcast and receiving apparatus
US4349696A (en) * 1979-02-05 1982-09-14 Hitachi, Ltd. AM Stereophonic demodulator circuit for amplitude/angle modulation system
US4468537A (en) * 1980-06-19 1984-08-28 Pioneer Electronic Corporation Sound system having suppression of AM stereophonic receiving circuit-induced noise
US20070041481A1 (en) * 2005-08-16 2007-02-22 Agere Systems Inc. Single path architecture & automatic gain control (SAGC) algorithm for low power SDARS receivers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155852A (en) * 1981-03-20 1982-09-27 Sony Corp Stereo reproducing device

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2098561A (en) * 1934-02-09 1937-11-09 Rca Corp System for producing stereosonic effects
GB540185A (en) * 1939-06-30 1941-10-08 Standard Telephones Cables Ltd System of transmission of electrical waves
US2357975A (en) * 1942-03-16 1944-09-12 Rca Corp Frequency modulation system
US2474244A (en) * 1944-05-19 1949-06-28 Standard Telephones Cables Ltd Amplitude modulated time modulated pulse system
US2491918A (en) * 1949-12-20 Stereophonic receiving system
US2512530A (en) * 1947-06-18 1950-06-20 Gen Railway Signal Co Radio communication system
US2532150A (en) * 1944-06-06 1950-11-28 Hartford Nat Bank & Trust Co Stereophonic sound recording system
US2617923A (en) * 1949-08-31 1952-11-11 Kxok Inc Radio broadcasting system with selective program elimination
US2698379A (en) * 1951-04-28 1954-12-28 Philips Nv Transmission system for stereophonic signals
US2714633A (en) * 1953-10-08 1955-08-02 Perspecta Sound Inc Perspective sound systems
US2851532A (en) * 1953-04-21 1958-09-09 Murray G Crosby Multiplex communication system
US2878319A (en) * 1957-06-25 1959-03-17 Nathaniel L Leek Multiplex transmission system
US2912492A (en) * 1953-02-09 1959-11-10 Philips Corp Multiplex transmission system

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491918A (en) * 1949-12-20 Stereophonic receiving system
US2098561A (en) * 1934-02-09 1937-11-09 Rca Corp System for producing stereosonic effects
GB540185A (en) * 1939-06-30 1941-10-08 Standard Telephones Cables Ltd System of transmission of electrical waves
US2357975A (en) * 1942-03-16 1944-09-12 Rca Corp Frequency modulation system
US2474244A (en) * 1944-05-19 1949-06-28 Standard Telephones Cables Ltd Amplitude modulated time modulated pulse system
US2532150A (en) * 1944-06-06 1950-11-28 Hartford Nat Bank & Trust Co Stereophonic sound recording system
US2512530A (en) * 1947-06-18 1950-06-20 Gen Railway Signal Co Radio communication system
US2617923A (en) * 1949-08-31 1952-11-11 Kxok Inc Radio broadcasting system with selective program elimination
US2698379A (en) * 1951-04-28 1954-12-28 Philips Nv Transmission system for stereophonic signals
US2912492A (en) * 1953-02-09 1959-11-10 Philips Corp Multiplex transmission system
US2851532A (en) * 1953-04-21 1958-09-09 Murray G Crosby Multiplex communication system
US2714633A (en) * 1953-10-08 1955-08-02 Perspecta Sound Inc Perspective sound systems
US2878319A (en) * 1957-06-25 1959-03-17 Nathaniel L Leek Multiplex transmission system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908090A (en) * 1972-05-10 1975-09-23 Leonard R Kahn Compatible AM stereophonic transmission system
US3944749A (en) * 1972-05-10 1976-03-16 Kahn Leonard R Compatible AM stereophonic receivers involving sideband separation at IF frequency
DE2323658A1 (de) 1972-05-10 1973-11-29 Kahn Leonard R Stereophones uebertragungs- und empfangssystem und -verfahren
DE2366604C2 (es) * 1972-05-10 1988-04-21 Leonard Richard Westbury N.Y. Us Kahn
US4218586A (en) * 1976-04-07 1980-08-19 Motorola, Inc. Compatible AM stereo broadcast system
US4332978A (en) * 1977-03-21 1982-06-01 The Magnavox Consumer Electronics Co. Low frequency AM stereophonic broadcast and receiving apparatus
US4302626A (en) * 1977-03-21 1981-11-24 Magnavox Consumer Electronics Company Low frequency AM stereophonic broadcast and receiving apparatus
DE2911487A1 (de) * 1978-03-27 1979-10-11 Ray Milton Dolby Fm-stereophonie-empfangs-schaltungsanordnung
US4349696A (en) * 1979-02-05 1982-09-14 Hitachi, Ltd. AM Stereophonic demodulator circuit for amplitude/angle modulation system
US4371747A (en) * 1980-03-24 1983-02-01 Motorola, Inc. AM Stereophonic decoder
WO1981002822A1 (en) * 1980-03-24 1981-10-01 Motorola Inc Am stereophonic decoder
US4468537A (en) * 1980-06-19 1984-08-28 Pioneer Electronic Corporation Sound system having suppression of AM stereophonic receiving circuit-induced noise
US20070041481A1 (en) * 2005-08-16 2007-02-22 Agere Systems Inc. Single path architecture & automatic gain control (SAGC) algorithm for low power SDARS receivers
US8260240B2 (en) * 2005-08-16 2012-09-04 Agere Systems Inc. Single path architecture and automatic gain control (SAGC) algorithm for low power SDARS receivers

Also Published As

Publication number Publication date
FR1259065A (fr) 1961-04-21
DE1441835B2 (de) 1972-06-22
DE1441835A1 (de) 1969-01-23
DE1252283B (es)
BE588627A (fr) 1960-07-01
NL249448A (es) 1964-04-10
GB946562A (en) 1964-01-15
NL7104525A (es) 1971-07-26
SE310374B (es) 1969-04-28
SE300017B (es) 1968-04-01

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