GB176019A - Improvements in or connected with telephonic instruments - Google Patents

Improvements in or connected with telephonic instruments

Info

Publication number
GB176019A
GB176019A GB24988/20A GB2498820A GB176019A GB 176019 A GB176019 A GB 176019A GB 24988/20 A GB24988/20 A GB 24988/20A GB 2498820 A GB2498820 A GB 2498820A GB 176019 A GB176019 A GB 176019A
Authority
GB
United Kingdom
Prior art keywords
electrode
rheostat
microphone
battery
contact
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
GB24988/20A
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.)
DICTOGRAPH PRODUCTS CORP
Original Assignee
DICTOGRAPH PRODUCTS 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 DICTOGRAPH PRODUCTS CORP filed Critical DICTOGRAPH PRODUCTS CORP
Priority to GB24988/20A priority Critical patent/GB176019A/en
Priority to FR524219A priority patent/FR524219A/en
Publication of GB176019A publication Critical patent/GB176019A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/247—Telephone sets including user guidance or feature selection means facilitating their use
    • H04M1/2474—Telephone terminals specially adapted for disabled people
    • H04M1/2475—Telephone terminals specially adapted for disabled people for a hearing impaired user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72475—User interfaces specially adapted for cordless or mobile telephones specially adapted for disabled users
    • H04M1/72478—User interfaces specially adapted for cordless or mobile telephones specially adapted for disabled users for hearing-impaired users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/73—Battery saving arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Otolaryngology (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Human Computer Interaction (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

176,019. Pattison, E. W., (Dictograph Products Corporation). Aug. 30, 1920. Microphones.-In a portable telephone set, particularly adapted for persons with impaired hearing, the microphone is provided with an internal rheostat the resistance of which is altered by means of a moving arm rotated with the carbon electrode, in order to maintain a constant intensity of sound as the battery runs down, or to compensate for varying distances of the source. A disc member 8, Fig. 2, is let into the back of the microphone casing and is connected with the electrode 10, containing granules 11, by means of a screw 13. A nut 15 engages the end of the screw, and by compressing a spring 17 holds the disc 8 and electrode in frictional contact. As the disc 8 is rotated it carries with it the electrode 10 and a contact arm 24 which is clamped between the two. This arm engages the rheostat 25 which is arranged inside the casing concentrically with the electrode. As shown in Fig. 5, current from the battery B passes by a terminal 30 through a strip 24 to the receiver R, thence by way of a strip 35 to a conducting ring 4 in contact with the diaphragm 3, Fig. 2, through the microphone, and back via the contact arm 24 and rheostat 25 to the battery
GB24988/20A 1920-08-30 1920-08-30 Improvements in or connected with telephonic instruments Expired GB176019A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB24988/20A GB176019A (en) 1920-08-30 1920-08-30 Improvements in or connected with telephonic instruments
FR524219A FR524219A (en) 1920-08-30 1920-09-14 Rheostat for telephone devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB24988/20A GB176019A (en) 1920-08-30 1920-08-30 Improvements in or connected with telephonic instruments
FR524219T 1920-09-14

Publications (1)

Publication Number Publication Date
GB176019A true GB176019A (en) 1922-02-28

Family

ID=10220392

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24988/20A Expired GB176019A (en) 1920-08-30 1920-08-30 Improvements in or connected with telephonic instruments

Country Status (2)

Country Link
FR (1) FR524219A (en)
GB (1) GB176019A (en)

Also Published As

Publication number Publication date
FR524219A (en) 1921-08-31

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