US 2002/0118824 A1 · Mobile phone having a detachable keypad and the detachable keypad thereof

Abstract

Disclosed are a detachable keypad and a mobile phone with the detachable keypad. The detachable keypad includes an earphone-microphone jack, a key array, and a DTMF generator. When a key is pressed while an earphone plug is inserted into the earphone-microphone jack, a DTMF signal corresponding to the pressed key is transmitted to a microphone of a mobile phone through an earphone-microphone speaker. In the mobile phone, an earphone-microphone speaker fixing portion fixes an earphone-microphone speaker at a position suitable for a microphone to receive sound from the earphone-microphone speaker. An audio/DTMF separator separates a signal received at the microphone into an audio signal and a DTMF signal. A controller analyzes the DTMF signal and performs an operation according to the analysis result.

Claims7

Dependent claims

A detachable keypad comprising:

an earphone-microphone jack;
a key array;
and
a DTMF (Dual Tone Multi-Frequency) generator,
wherein when a key is pressed while an earphone plug is inserted into the earphone-microphone jack, a DTMF signal is generated by the DTMF generator corresponding to the pressed key and is transmitted to a microphone of a mobile phone through an earphone-microphone speaker.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/085,599Filed 27 Feb 2002

Priority

KR 2001-1056628 Feb 2001

Published

29 Aug 2002

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04M 1/0256
Comprising one or a plurality of mechanically detachable modules: wherein the modules are operable in the detached state, e.g. one module for the…
H04M 1/0214
Characterized by the relative motions of the body parts: foldable telephones, i.e. with body parts pivoting to an open position around an axis…
H04M 1/2155
By non-intrusive coupling means, e.g. acoustic couplers: acoustic coupling
H04M 1/23
Constructional features of telephone sets: construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof

Mobile phone having a detachable keypad and the detachable keypad thereof

Life of this patent

Mobile phone having a detachable keypad and the detachable keypad thereof

Life of this patent

Abstract

Claims7