Mobile telephone

• US 20050272407A1
• Filed: 01/23/2004
• Published: 12/08/2005
• Est. Priority Date: 01/23/2003
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kayamori, Manabu
• Application Number:
  US10/523,905
• Publication Number:
  US 20050272407A1
• Time in Patent Office: Days
• US Class Current: 455/412.100
• CPC Class Codes: H04M 19/041 Encoding the ringing signal, i.e. providing distinctive or selective ringing capability

Abstract

It is an object of the present invention to provide a portable telephone in which external sound can be used as a call receiving sound and a pause of sound can be avoided even when the switching operation of a base station is generated during reproducing the call receiving sound.

Sound picked up by a microphone (180) is subjected to an AD conversion, then encoded by an ADPCM system in an encoding part (141) and stored in an ADPCM encoded data storing area (150b). The stored audio data of a partner to talk with is encoded by the ADPCM system in the encoding part (141) via a digital audio signal processing part (122) and stored in the ADPCM encoded data storing area (150b). Upon receiving a call, the stored data is read, decoded to an analog audio signal in a decoding part (142) and outputted as the call receiving sound from a speaker (181) via an audio output circuit (136). Since the decoding part (142) does not depend on the operation of a communication control part (121), even when the communication control part (121) is reset by switching a channel during reproducing the call receiving sound, the pause of the call receiving sound is nor generated.

Claims

1. A portable telephone comprising:

a sound picking up unit for picking-up external sound;

an audio encoding unit for encoding an audio signal picked up by the sound picking up unit;

an encoded data storing unit for storing the audio data encoded by the audio encoding unit;

an audio decoding unit for decoding the audio data stored in the encoded data storing unit;

a call receiving sound output unit for outputting the audio data decoded by the audio decoding unit as a call receiving sound; and

a communication control unit for switching a base station, characterized in that the function of the audio decoding unit is provided in another circuit block that does not depend on the operation of a circuit block functioning as the communication control unit.

3. The portable telephone according to claim 1 or 2, characterized in that the audio encoding unit encodes the inputted audio signal by an ADPCM system and the audio decoding unit decodes the inputted audio data by the ADPCM system.

4. The portable telephone according to claim 1, 2 or 3, characterized in that a noise component removing unit is provided for removing the noise component of the audio signal inputted to the audio encoding unit.

5. The portable telephone according to claim 1, 2 or 3, characterized in that a musical scale adjusting unit is provided for adjusting the musical scale of the audio signal inputted to the audio encoding unit.

2. A portable telephone comprising:

an audio recording unit for recording an audio signal of a partner to talk with;

an audio encoding unit for encoding the audio signal recorded by the audio recording unit;

an encoded data storing unit for storing the audio data encoded by the audio encoding unit;

an audio decoding unit for decoding the audio data stored in the encoded data storing unit;

a call receiving sound output unit for outputting the audio data decoded by the audio decoding unit as a call receiving sound; and

a communication control unit for switching a base station, characterized in that the function of the audio decoding unit is provided in another circuit block that does not depend on the operation of a circuit block functioning as the communication control unit.