GB1447391A

GB1447391A – Grooved record playback system
– Google Patents

GB1447391A – Grooved record playback system
– Google Patents
Grooved record playback system

Info

Publication number
GB1447391A

GB1447391A
GB3847873A
GB3847873A
GB1447391A
GB 1447391 A
GB1447391 A
GB 1447391A
GB 3847873 A
GB3847873 A
GB 3847873A
GB 3847873 A
GB3847873 A
GB 3847873A
GB 1447391 A
GB1447391 A
GB 1447391A
Authority
GB
United Kingdom
Prior art keywords
transducers
pick
stylus arm
stylus
motions
Prior art date
1972-08-17
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
GB3847873A
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.)

NAGAMURA F

Original Assignee
NAGAMURA F
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.)
1972-08-17
Filing date
1973-08-14
Publication date
1976-08-25

1972-08-17
Priority claimed from JP8263372A
external-priority
patent/JPS4940104A/ja

1972-09-11
Priority claimed from JP9104172A
external-priority
patent/JPS4949601A/ja

1972-09-11
Priority claimed from JP9104072A
external-priority
patent/JPS4946902A/ja

1972-09-16
Priority claimed from JP47093024A
external-priority
patent/JPS4951906A/ja

1973-02-05
Priority claimed from JP1452773A
external-priority
patent/JPS49104608A/ja

1973-02-05
Priority claimed from JP1452973A
external-priority
patent/JPS49104609A/ja

1973-03-22
Priority claimed from JP48032949A
external-priority
patent/JPS49121501A/ja

1973-08-14
Application filed by NAGAMURA F
filed
Critical
NAGAMURA F

1976-08-25
Publication of GB1447391A
publication
Critical
patent/GB1447391A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H04—ELECTRIC COMMUNICATION TECHNIQUE

H04S—STEREOPHONIC SYSTEMS 

H04S3/00—Systems employing more than two channels, e.g. quadraphonic

H04S3/006—Systems employing more than two channels, e.g. quadraphonic in which a plurality of audio signals are transformed in a combination of audio signals and modulated signals, e.g. CD-4 systems

G—PHYSICS

G11—INFORMATION STORAGE

G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor

G11B20/00992—Circuits for stereophonic or quadraphonic recording or reproducing

H—ELECTRICITY

H04—ELECTRIC COMMUNICATION TECHNIQUE

H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS

H04R11/00—Transducers of moving-armature or moving-core type

H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

H04R11/12—Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

H—ELECTRICITY

H04—ELECTRIC COMMUNICATION TECHNIQUE

H04S—STEREOPHONIC SYSTEMS 

H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups

H04S2400/15—Aspects of sound capture and related signal processing for recording or reproduction

H—ELECTRICITY

H04—ELECTRIC COMMUNICATION TECHNIQUE

H04S—STEREOPHONIC SYSTEMS 

H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 

H04S5/005—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo five- or more-channel type, e.g. virtual surround

Abstract

1447391 Multichannel pick-ups; multichannel systems F NAGAMURA 14 Aug 1973 [17 Aug 1972 11 Sept 1972 (2) 16 Sept 1972 5 Feb 1973 (2)] 38478/73 Headings H4J and H4R A multichannel pick-up has at least three transducers mounted in spaced angular relationship to one another and responsive to movement of a stylus. The transducers have main detecting axes which are oriented in different directions and which, in the case of an even number of transducers are symmetrically disposed on opposite sides of a plane perpendicular to the surface of the record and tangential to the groove at the point of contact and in the case of an odd number one is disposed in the plane and the remainder are symmetrically disposed on opposite sides of the plane. A pick-up (Fig. 12) has a stylus arm 1031, 10311 connected by coupling members 111, 112, 113, 114 to transducers D 1 , D 2 , D 3 , D 4 , which may be piezoelectric or semi-conductor type. In use coupling members 111, 112 are at angles of 22¢ degrees to the plane of the record surface while coupling members 113, 114 are at angles of 22¢ degrees to the normal to the record surface. Two elastomeric damping elements 101, 102 (these may be a single member) are of oblong form so that freedom of movement of stylus arm portion 1031 is a maximum along the diagonals Lf, Rf of element 101 (Fig. 9) and freedom of movement of stylus arm portion 10311 is a maximum along the diagonals Lb, Rb of element 102. Transducers D 1 , D 2 detect Lf and Rf motions maximally and transducers D 3 , D 2 detect Lb and Rb motions maximally. The damping elements 101, 102 are such that transducers D 1 , D 4 hardly respond to Lb and Rb motions while transducers D 3 , D 2 hardly respond to Lf and Rf motions. In a moving armature pick-up (Fig. 13) the stylus arm is of magnetic material and co-operates with core structures 115, 116, 117, 118. If desired the damping elements may be at one end of the stylus arm, the stylus being at the other end to form a cantilever structure (not shown). An alternative moving armature pick-up (Fig. 15) has a cantilever stylus arm carrying four projections DRF1, DRB1, DLB1, DLF1 adjacent ones of which are spaced apart 45 degrees. Each carries a magnetic member 132a … &c. which co-operates with a pair of spaced core arms D 1 1, D 2 1 … &c. to define air gaps. Radial motion of a projection varies the reluctance of the associated air gap, thereby generating an E.M.F. in an associated winding (139), Fig. 18 (not shown). Circuitry.-A pick-up having four transducers D 1 , D 2 , D 3 , D 4 (Fig. 7c) has built-in crosstalk reduction circuitry and feeds a quadraphonic amplifier which feeds separate signals to four loud-speakers LF, RF, LB and RB. If desired, adder networks also feed additional loud-speakers CF, CB, CL and CR. When playing a stereophonic record the crosstalk reduction circuitry is replaced by two adder networks which feed a stereophonic amplifier to supply loud-speakers L and R. Crosstalk reduction between the four signals from the transducers is provided by resistors (Fig. 22) which interconnect the four channels, some including inverter amplifiers INV. 1, INV. 2 and by buffer amplifiers BF1, BF2. Phase shift circuits PS3 and PS4 are also used. An alternative crosstalk reduction circuit is also described (Fig. 23, not shown).

GB3847873A
1972-08-17
1973-08-14
Grooved record playback system

Expired

GB1447391A
(en)

Applications Claiming Priority (7)

Application Number
Priority Date
Filing Date
Title

JP8263372A

JPS4940104A
(en)

1972-08-17
1972-08-17

JP9104172A

JPS4949601A
(en)

1972-09-11
1972-09-11

JP9104072A

JPS4946902A
(en)

1972-09-11
1972-09-11

JP47093024A

JPS4951906A
(en)

1972-09-16
1972-09-16

JP1452773A

JPS49104608A
(en)

1973-02-05
1973-02-05

JP1452973A

JPS49104609A
(en)

1973-02-05
1973-02-05

JP48032949A

JPS49121501A
(en)

1973-03-22
1973-03-22

Publications (1)

Publication Number
Publication Date

GB1447391A
true

GB1447391A
(en)

1976-08-25

Family
ID=27563684
Family Applications (2)

Application Number
Title
Priority Date
Filing Date

GB1028376A
Expired

GB1447392A
(en)

1972-08-17
1973-08-14
Recording apparatus

GB3847873A
Expired

GB1447391A
(en)

1972-08-17
1973-08-14
Grooved record playback system

Family Applications Before (1)

Application Number
Title
Priority Date
Filing Date

GB1028376A
Expired

GB1447392A
(en)

1972-08-17
1973-08-14
Recording apparatus

Country Status (5)

Country
Link

US
(1)

US3987256A
(en)

CA
(1)

CA1023668A
(en)

DE
(1)

DE2341681A1
(en)

GB
(2)

GB1447392A
(en)

NL
(1)

NL7311311A
(en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US5883750A
(en)

*

1992-12-22
1999-03-16
Thomson-Csf
Method and system for the magnetic recording of information elements and information medium by providing current correction for cross-talk magnetic flux

US9820073B1
(en)

2017-05-10
2017-11-14
Tls Corp.
Extracting a common signal from multiple audio signals

Family Cites Families (8)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

NL106582C
(en)

*

1957-10-30

US3118977A
(en)

*

1960-07-01
1964-01-21
Rca Corp
Multi-groove stereophonic sound recording and reproducing system

US3691316A
(en)

*

1969-05-09
1972-09-12
Matsushita Electric Ind Co Ltd
Semiconductor stress transducer

US3687461A
(en)

*

1969-09-10
1972-08-29
Minoru Kamiya
Three dimensional sound recording and reproducing system

CA938560A
(en)

*

1969-11-28
1973-12-18
Victor Company Of Japan
System for recording and/or reproducing four channel signals on a record disc

US3710034A
(en)

*

1970-03-06
1973-01-09
Fibra Sonics
Multi-dimensional sonic recording and playback devices and method

JPS4944884B1
(en)

*

1971-07-02
1974-11-30

JPS5213082B1
(en)

*

1971-07-19
1977-04-12

1973

1973-08-14
GB
GB1028376A
patent/GB1447392A/en
not_active
Expired

1973-08-14
GB
GB3847873A
patent/GB1447391A/en
not_active
Expired

1973-08-16
NL
NL7311311A
patent/NL7311311A/xx
not_active
Application Discontinuation

1973-08-16
CA
CA178,919A
patent/CA1023668A/en
not_active
Expired

1973-08-17
DE
DE19732341681
patent/DE2341681A1/en
active
Pending

1974

1974-03-20
US
US05/452,989
patent/US3987256A/en
not_active
Expired – Lifetime

Also Published As

Publication number
Publication date

GB1447392A
(en)

1976-08-25

US3987256A
(en)

1976-10-19

CA1023668A
(en)

1978-01-03

DE2341681A1
(en)

1974-02-28

NL7311311A
(en)

1974-02-19

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Legal Events

Date
Code
Title
Description

1977-01-06
PS
Patent sealed [section 19, patents act 1949]

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