GB1294996A

GB1294996A – – Google Patents

GB1294996A – – Google Patents

Info

Publication number
GB1294996A

GB1294996A

GB1294996DA
GB1294996A
GB 1294996 A
GB1294996 A
GB 1294996A

GB 1294996D A
GB1294996D A
GB 1294996DA
GB 1294996 A
GB1294996 A
GB 1294996A
Authority
GB
United Kingdom
Prior art keywords
transistor
signal
switching
gates
resistor
Prior art date
1969-01-18
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

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.)
1969-01-18
Filing date
1970-01-19
Publication date
1972-11-01

1969-01-18
Priority claimed from JP44004299A
external-priority
patent/JPS4840407B1/ja

1969-01-18
Priority claimed from JP44004301A
external-priority
patent/JPS4840409B1/ja

1970-01-19
Application filed
filed
Critical

1972-11-01
Publication of GB1294996A
publication
Critical
patent/GB1294996A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

G—PHYSICS

G10—MUSICAL INSTRUMENTS; ACOUSTICS

G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE

G10H1/00—Details of electrophonic musical instruments

G10H1/18—Selecting circuits

G10H1/22—Selecting circuits for suppressing tones; Preference networks

Abstract

1294996 Transistor tone gating circuits MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 19 Jan 1970 [18 Jan 1969 (2)] 2576/70 Heading H3T [Also in Division G5] A signal selecting system is so arranged that, however, many switches 20-24 are closed, provided that switch 80 is also closed, one only of the gates 6-10 is opened to pass a signal to the output from the corresponding control terminal 152-156. Switches 20-24 are connected to the keyboard of an electronic musical instrument and depression of pedal 81 ensures that the tone corresponding to either the highest or lowest frequency is passed to the output if frequency generators f1-f5 are in progressive order. Transistors 29a-33a are normally conductive, but when any of keys 20-24 are closed, as well as key 80, the transistor corresponding to the uppermost key, and all those between it and the resistor 79 are cut off, and of the normally non-conductive transistors 29b-33b only the one whose emitter is connected to the base of the uppermost non-conducting transistor 29a-33a conducts, producing a switching voltage fed via one of diodes 39-43 to open one of the gates 152-156. Supply 96 is provided to make the switching action more reliable. The gate circuit, Fig. 3 (not shown), includes 3 transistors (128-130) for 41 , 81 , 161 tones, with separate inputs and outputs, and with bases connected together and to the control input (153). The input signal also charges capacitor (105) via a resistor (134b) giving a rise time to the gate, and the capacitor discharges via a series chain of resistors (134a, 134b) and transistor (110) whose base is connected to a variable supply to give controlled sustaining of tones transmitted through the gate. Whenever any one or more keys 20-24 are depressed, the current increase in resistor 82 gives rise to a signal which when amplified and differentiated triggers a monostable multivibrator 92, 98 to open transistor 100 for a short time, thus saturating transistor (110), Fig. 3 (not shown), and switching off all gates. When any key 20-24 is released, negative going pulses are fed via one of diodes 44-48 to a similar circuit to cause transistor 28 to be switched off for a short time interval, thus clearing the circuit. The switch 80 may be in series with the transistor 28. The switching may be performed by contacts. The signal from the output is fed via tone colour circuits (11), and amplifier (12) to a loud-speaker (13), Fig. 1 (not shown).

GB1294996D
1969-01-18
1970-01-19

Expired

GB1294996A
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

JP44004299A

JPS4840407B1
(en)

1969-01-18
1969-01-18

JP44004301A

JPS4840409B1
(en)

1969-01-18
1969-01-18

Publications (1)

Publication Number
Publication Date

GB1294996A
true

GB1294996A
(en)

1972-11-01

Family
ID=26338043
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB1294996D
Expired

GB1294996A
(en)

1969-01-18
1970-01-19

Country Status (4)

Country
Link

US
(1)

US3585892A
(en)

FR
(1)

FR2028585A1
(en)

GB
(1)

GB1294996A
(en)

NL
(1)

NL157439B
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2121173A
(en)

*

1982-04-28
1983-12-14
West Electric Co
Pulsed ultrasonic auto-focussing device

Family Cites Families (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3190951A
(en)

*

1961-11-15
1965-06-22
Chicago Musical Instr Co
Electrical musical instrument

US3488515A
(en)

*

1965-10-08
1970-01-06
Nippon Musical Instruments Mfg
Circuit arrangement for selective and durable signal coupling

US3446904A
(en)

*

1968-01-04
1969-05-27
Warwick Electronics Inc
Key system for electrical musical instrument

1970

1970-01-13
NL
NL7000437.A
patent/NL157439B/en
not_active
IP Right Cessation

1970-01-16
FR
FR7001594A
patent/FR2028585A1/fr
active
Pending

1970-01-19
US
US3921A
patent/US3585892A/en
not_active
Expired – Lifetime

1970-01-19
GB
GB1294996D
patent/GB1294996A/en
not_active
Expired

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2121173A
(en)

*

1982-04-28
1983-12-14
West Electric Co
Pulsed ultrasonic auto-focussing device

Also Published As

Publication number
Publication date

DE1964826B2
(en)

1975-11-20

DE1964826A1
(en)

1970-08-27

NL157439B
(en)

1978-07-17

FR2028585A1
(en)

1970-10-09

NL7000437A
(en)

1970-07-21

US3585892A
(en)

1971-06-22

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Legal Events

Date
Code
Title
Description

1973-03-14
PS
Patent sealed [section 19, patents act 1949]

1990-02-21
PE20
Patent expired after termination of 20 years

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