GB502423A - Improvements in dictating machines - Google Patents
Improvements in dictating machinesInfo
- 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
Links
- 239000013078 crystal Substances 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
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)
- Recording Measured Values (AREA)
- Stringed Musical Instruments (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (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.
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)
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 |
DE967840C (en) * | 1951-03-22 | 1957-12-19 | Electroacustic Gmbh | Stylus with one or more stylus carrying leaf spring for pickups |
DE936653C (en) * | 1951-03-22 | 1955-12-15 | Electroacustic Ges M B H | Pickup systems on speaking machines |
-
1936
- 1936-10-05 US US103960A patent/US2143819A/en not_active Expired - Lifetime
-
1937
- 1937-09-21 GB GB25596/37A patent/GB502423A/en not_active Expired
- 1937-09-21 GB GB12127/38A patent/GB502445A/en not_active Expired
- 1937-10-04 FR FR827478D patent/FR827478A/en not_active Expired
- 1937-10-04 CH CH203475D patent/CH203475A/en unknown
-
1938
- 1938-03-09 US US194807A patent/US2181437A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CH203475A (en) | 1939-03-15 |
US2143819A (en) | 1939-01-10 |
US2181437A (en) | 1939-11-28 |
FR827478A (en) | 1938-04-27 |
GB502445A (en) | 1939-03-17 |
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