Method of transmitting voice information and an electronic communications device for transmission of voice information

• US 20020025048A1
• Filed: 03/30/2001
• Published: 02/28/2002
• Est. Priority Date: 03/31/2000
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Lindgren, Ulf, Gustafsson, Harald, Claesson, Ingvar, Dahl, Mattias
• Application Number:
  US09/820,861
• Publication Number:
  US 20020025048A1
• Time in Patent Office: Days
• US Class Current: 381/61
• CPC Class Codes: G10L 19/012 Comfort noise or silence coding
• CPC Class Codes: G10L 21/0208 Noise filtering
• CPC Class Codes: G10L 21/0272 Voice signal separating
• CPC Class Codes: H04M 1/19 Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor circuit arrangements for preventing eavesdropping H04M1/68; telephone cabinets E04H1/14
• CPC Class Codes: H04M 1/6008 in the transmitter circuit
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones

Abstract

A method of transmitting voice information from an electronic communications device (1) comprises the steps of receiving the voice information from the environment of the device together with a first background sound, generating a sound signal having a first signal part representing the voice information and a second signal part representing the first background sound, reducing the signal part representing the first background sound, and transmitting the sound signal through a communications channel to which the device is connected. The method further comprises the step of adding to the sound signal an additional signal representing a second background sound. In this way background noise can be removed, while a natural and comfortable conversation can be maintained without revealing the location of the user of the device.

Claims

1. A method of transmitting voice information from an electronic communications device (1), said method comprising the steps of

receiving said voice information from the environment of the device together with a first background sound,

generating a sound signal having a first signal part representing the voice information and a second signal part representing the first background sound,

reducing the signal part representing the first background sound, and

transmitting said sound signal through a communications channel to which the device is connected,

characterized in that the method further comprises the step of adding to said sound signal an additional signal representing a second background sound.

2. A method according to claim 1, characterized in that the step of adding an additional signal representing the second background sound is performed in said electronic communications device (1).

3. A method according to claim 1 or 2, characterized in that the step of adding the additional signal comprises replaying a pre-recorded background sound stored in the device (1).

4. A method according to claim 1, characterized in that the step of adding an additional signal representing the second background sound is performed in said communications channel.

5. A method according to claim 1, characterized in that the signal part representing the first background sound is reduced to a level where the background sound is substantially removed.

6. An electronic communications device (1) for transmission of voice information, comprising

transducer means (2) for receiving the voice information from the environment of the device together with a first background sound, and for generating a sound signal comprising a first signal part representing the voice information and a second part representing the first background sound,

means (5) for reducing the signal part representing the first background sound, and

means (7, 8) for transmitting the sound signal through a communications channel to which the device is connected,

characterized in that it further comprises means (9, 10) for adding to said sound signal an additional signal representing a second background sound.

7. An electronic communications device according to claim 6, characterized in that the means (9, 10) for adding an additional signal comprises means for playback of audio signals.

8. An electronic communications device according to claim 7, characterized in that the device further comprises means (13) for storing a pre-recorded background sound in the device.

9. An electronic communications device according to claim 8, characterized in that the device further comprises means (14) for recording a background sound for storage in the device.

10. An electronic communications device according to claim 7, characterized in that the device further comprises means (17) for downloading audio files through said communications channel.

11. An electronic communications device according to claim 10, characterized in that the device is adapted to download and play back said audio files on-line.

12. An electronic communications device according to any one of claims 7-11, characterized in that the device is adapted to play back a smooth background sound and to add more distinct sounds at random instances.

13. An electronic communications device according to any one of claims 6-12, characterized in that the device further comprises means for selecting by a user, at the beginning of a call, whether said means for reducing the signal part representing the first background sound and said means for adding an additional signal are to be enabled during the call.

14. An electronic communications device according to any one of claims 6-12, characterized in that the device is adapted to select automatically whether said means for reducing the signal part representing the first background sound and said means for adding an additional signal are to be enabled in dependence on parameters stored in the device.

15. An electronic communications device according to any one of claims 6-14, characterized in that the device is a mobile telephone.