Title:
PORTABLE TELEPHONE USING SINGLE EARPHONE HAVING MICROPHONE FUNCTION
Document Type and Number:
WIPO Patent Application WO/2001/052595
Kind Code:
A1
Abstract:
A portable telephone which is compact, wherein audio equipment used in the portable telephone includes only one earphone having a reversible microphone function and electrical feedback is based on practically necessary -60 dB, the earphone being housed in the portable telephone and removably supported. The characteristics of the earphone having the microphone function for effecting electrical feedback based on 60 dB are utilized to combine a compressor and an expander with a cancellation circuit, and the cord of the earphone is housed in the portable telephone, it being arranged that the earphone is not separated from the portable telephone.
Inventors:
MASUDA MASAHISA (JP)
Application Number:
PCT/JP2000/009432
Publication Date:
July 19, 2001
Filing Date:
December 28, 2000
Export Citation:
Assignee:
MICRO M S INC (JP)
MASUDA MASAHISA (JP)
MASUDA MASAHISA (JP)
International Classes:
H04B7/26; H04M1/05; H04M1/15; H04M1/60; (IPC1-7): H04R1/10; H04M1/60; H04R3/00
Foreign References:
| JP3063454U | 1999-11-05 | |||
| JPS5834486U | 1983-03-05 | |||
| JPS53164826U | 1978-12-23 | |||
| JPS50124619A | 1975-09-30 | |||
| JPH0262864U | 1990-05-10 |
Attorney, Agent or Firm:
Seya, Toru (8-14 Akasaka 3-chome Minato-ku, Tokyo, JP)
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