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GB502423A - Improvements in dictating machines - Google Patents

Improvements in dictating machines

Info

Publication number
GB502423A
GB502423A GB25596/37A GB2559637A GB502423A GB 502423 A GB502423 A GB 502423A GB 25596/37 A GB25596/37 A GB 25596/37A GB 2559637 A GB2559637 A GB 2559637A GB 502423 A GB502423 A GB 502423A
Authority
GB
United Kingdom
Prior art keywords
switch
amplifier
circuit
recording
lead
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
Application number
GB25596/37A
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.)
Dictaphone Corp
Original Assignee
Dictaphone 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 Dictaphone Corp filed Critical Dictaphone Corp
Publication of GB502423A publication Critical patent/GB502423A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/02—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using cylindrical record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/06—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using web-form record carriers, e.g. tape

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Recording Measured Values (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Stringed Musical Instruments (AREA)
  • Studio Devices (AREA)

Abstract

502,423. Gramophone recording and reproducing circuits. DICTAPHONE CORPORATION. Sept. 21, 1937, No. 25596. Convention date, Oct. 5, 1936. [Class 40 (iv)] [Also in Group XXXVIII] A dictating machine of the kind comprising recording and reproducing styli is provided with a piezo-crystal recorder-reproducer unit 22 which is operated in conjunction with a switch 35, whereby the microphone 33 of the mouthpiece 7 of the instrument may be connected to the input circuit of an amplifier 32 to function as a transmitter during' recording, and to the output circuit of the amplifier to function as a reproducing microphone during reproduction. The switch 35, which is provided with two arms, is operated through a system of levers 41, 38, 37, Fig. 4, by the manual control lever 27 which actuates the recorder-reproducer unit. The amplifier input and output leads 77, 78 are connected to the pivoted ends of the switch arms, the recorder-reproducer lead 93 to the centre one of three contacts and the microphone lead 94 to the two outer contacts. Fig. 6 shows the circuit connections during reproducing, the lead 93 being connected to the input circuit of the amplifier and the lead 94 to the output circuit. For recording, the arms of the switch are moved to the right to reverse the connections to the amplifier. In order to supply a small current to the heating elements 79 of the amplifier when the machine is not in use, a switch 31 in series with a resistance 80 is provided in the power supply circuit, and when this switch is closed a signal lamp 30 is illuminated to indicate that the machine is connected to the power supply. When the motor switch 6 is closed to operate the machine, the switch 31 and resistance 80 are 'shortcircuited by a connection to the contact head 82 of the motor switch, and full operating current is passed through the heating circuit of the amplifier. The piezo-crystal recorderreproducer unit forms the subject of Specification 502,445.
GB25596/37A 1936-10-05 1937-09-21 Improvements in dictating machines Expired GB502423A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US103960A US2143819A (en) 1936-10-05 1936-10-05 Dictating machine
US194807A US2181437A (en) 1936-10-05 1938-03-09 Dictating machine

Publications (1)

Publication Number Publication Date
GB502423A true GB502423A (en) 1939-03-17

Family

ID=26801032

Family Applications (2)

Application Number Title Priority Date Filing Date
GB25596/37A Expired GB502423A (en) 1936-10-05 1937-09-21 Improvements in dictating machines
GB12127/38A Expired GB502445A (en) 1936-10-05 1937-09-21 Improvements in piezo-electric recording and reproducing devices suitable for use in dictating machines

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB12127/38A Expired GB502445A (en) 1936-10-05 1937-09-21 Improvements in piezo-electric recording and reproducing devices suitable for use in dictating machines

Country Status (4)

Country Link
US (2) US2143819A (en)
CH (1) CH203475A (en)
FR (1) FR827478A (en)
GB (2) GB502423A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485137A (en) * 1944-10-30 1949-10-18 Brush Dev Co Connection means for phonograph pickups
US2545652A (en) * 1945-07-11 1951-03-20 Edison Inc Thomas A Phonograph recorder and reproducer
US2547227A (en) * 1948-11-09 1951-04-03 Philco Corp Phonograph pickup having a quadrilateral crystal with only one corner free to flex
US2634336A (en) * 1949-02-09 1953-04-07 Magnavox Co Dual stylus phonograph pickup
US2670407A (en) * 1949-02-17 1954-02-23 Magnavox Co Drive system for crystal pickups
US2681388A (en) * 1949-03-03 1954-06-15 Columbia Broadcasting Syst Inc Phonograph pickup
US2586362A (en) * 1949-03-11 1952-02-19 Magnavox Co Dual point phonograph pickup stylus
US2575999A (en) * 1949-05-18 1951-11-20 Astatic Corp Piezoelectric phonograph pickup
DE936653C (en) * 1951-03-22 1955-12-15 Electroacustic Ges M B H Pickup systems on speaking machines
DE967840C (en) * 1951-03-22 1957-12-19 Electroacustic Gmbh Stylus with one or more stylus carrying leaf spring for pickups

Also Published As

Publication number Publication date
US2181437A (en) 1939-11-28
US2143819A (en) 1939-01-10
FR827478A (en) 1938-04-27
GB502445A (en) 1939-03-17
CH203475A (en) 1939-03-15

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