United States Patent  [ii] Patent Number: 4,980,910
Oba et al.  Date of Patent: Dec. 25,1990
 PORTABLE AUTOMATIC DIALING UNIT
 Inventors: Toshiro Oba; Eichika Matsuda, both of Nara; Hisao Kunita, Mie, all of Japan
 Assignee: Sharp Kabushiki Kaisha, Osaka,
 Appl. No.: 343,791
 Filed: Apr. 27,1989
 Foreign Application Priority Data
Apr. 28, 1988 [JP] Japan 63-106654
Apr. 28, 1988 [JP] Japan 63-106652
 Int. CI.* H04M 1/272
 U.S. CI 379/355; 379/354
 Field of Search 379/354, 355, 357, 96,
 References Cited
U.S. PATENT DOCUMENTS
4,117,542 9/1978 Klausner 379/355 X
4,201,887 5/1980 Bums 379/96
4,800,255 1/1989 Imran 235/382
Radio Shack 1987 Catalog, 12-1986, p. 153.
Radio Shack 1985 Catalog, 12-1984, p. 86.
Primary Examiner—James L. Dwyer
In a portable dialing unit dial data inputted through a keyboard are registered in an internal memory. When desired dial data is retrieved from the registered dial data and a dial key is pressed, the retrieved dial data is converted to corresponding tone signals and supplied to a speaker. The speaker outputs corresponding tones. A portable automatic dialing unit is acoustically coupled to a mouthpiece of a telephone set. The tones outputted from the speaker are again converted to tone signals by the telephone set, and transmitted to a telephone line. A switchboard is driven by the tone signals. The unit includes two modes: The first mode includes registered target numbers and the second mode includes data for special telephone service. The target number in the first mode can be inserted into any position of the data in the second mode.
7 Claims, 7 Drawing Sheets