AUDIO DEVICE

• US 20120148062A1
• Filed: 06/09/2011
• Published: 06/14/2012
• Est. Priority Date: 06/11/2010
• Status: Active Grant

• Current Assignee: Goodix Technology Co., Ltd. (Shenzhen Goodix Technology Co., Ltd.)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Huijser, Jan-Paul Paulus, Scarlett, Shawn
• Granted Patent: US 8,693,701 B2
• Time in Patent Office: Days
• US Class Current: 381/71.6
• CPC Class Codes: G10K 11/17821 characterised by the analysis of the input signals only
• CPC Class Codes: G10K 11/1783 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
• CPC Class Codes: G10K 11/17855 for improving speed or power requirements
• CPC Class Codes: G10K 11/17873 using a reference signal without an error signal, e.g. pure feedforward
• CPC Class Codes: G10K 11/17885 additionally using a desired external signal, e.g. pass-through audio such as music or speech
• CPC Class Codes: G10K 2210/1081 Earphones, e.g. for telephones, ear protectors or headsets

Abstract

Existing ANC headsets have active noise reduction circuitry and a power supply in the headset. Alternate ANC headsets rely on ANC circuitry in the player and have non-standard connectors meaning that they cannot be used with any other players. An audio headset (90) having an encoder (54) and active noise cancellation audio processing device (80) having a decoder (32) are described. The encoder (54) enables the audio headset to be used in enhanced (ANC) mode when connected to a compatible audio processing device and in normal mode when connected to a non-compatible audio processing device since a standard audio jack plug can be used. Similarly the decoder (62) in the active noise cancellation audio processing device (80) enables the active noise cancellation audio processing device to be used in enhanced mode when connected to a compatible audio headset and in normal mode connected to a non-compatible audio headset since a standard audio socket can be used.

Claims

1. An audio headset compatible with active noise cancelling audio processing devices and audio processing devices without active noise cancelling, the audio headset comprising:

at least one microphone for measuring noise;

an encoder for encoding a noise measurement signal received from the microphone via an input of the encoder, to produce an encoded noise measurement signal; and

a connector for connecting the audio headset to an audio processing device, the connector having a terminal for carrying a microphone signal,

wherein the audio headset is operable when connected to an active noise cancelling audio processing device

to output the encoded noise measurement signal via the terminal; and

to receive a combined audio and anti-noise signal from the active noise cancelling audio processing device; and

when connected to an audio processing device without active noise cancelling;

to output one of a null signal and an unencoded signal from the at least one microphone via the terminal; and

to receive an audio signal from the audio processing device without active noise cancelling.

2. The audio headset of claim 1, further comprising at least one switch coupled to a further input of the encoder, and wherein the audio headset is operable to output an encoded signal reflecting a state of the at least one switch and the encoded microphone signals.

3. The audio headset according to claim 1, wherein a power supply for the encoder is supplied via the terminal.

4. The audio headset according to claim 1, wherein the connector comprises a 3.5 mm audio plug.

5. The audio headset according to claim 1, wherein the connector comprises

a further terminal for receiving an identifying signal for identifying a compatible active noise cancelling audio processing device, and

the encoder comprises

a further input coupled to the further terminal,

wherein the encoder is operable to receive the identifying signal via the further terminal and enable or disable encoding according to a content of the identifying signal.

6. The audio headset of claim 1, wherein the encoder is operable to send an audio headset identifying signal via the terminal of the connector.

7. The audio headset of claim 6 wherein the audio headset identifying signal has a frequency greater than 20 KHz.

8. The audio headset of claim 6 wherein the audio headset identifying signal includes audio headset calibration parameters.

13. An active noise cancellation system comprising:

the audio headset of claim 1 connectable, by their respective connectors, to the active noise cancelling audio processing device including;

a connector for connecting the audio processing device to the audio headset, the connector having a terminal for carrying a microphone signal,

an active noise cancelling processor,

a decoder having an input coupled to the terminal and an output coupled to the active noise cancelling processor;

wherein the audio processing device is operable when connected to an audio headset adapted for active noise cancellation

to receive an encoded noise measurement signal from the audio headset via the terminal;

to use the decoder to decode the encoded noise measurement signal; and

to use the active noise cancelling processor to generate a combined audio and anti-noise signal; and

when connected to an audio headset not adapted for active noise cancelling;

to receive one of an unencoded microphone signal and a null signal from the audio headset via the terminal; and

to generate an audio signal not including an anti-noise signal.

9. An active noise cancelling audio processing device comprising

a connector for connecting the audio processing device to an audio headset, the connector having a terminal for carrying a microphone signal,

an active noise cancelling processor,

a decoder having an input coupled to the terminal and an output coupled to the active noise cancelling processor;

wherein the audio processing device is operable when connected to an audio headset adapted for active noise cancellation

to receive an encoded noise measurement signal from the audio headset via the terminal;

to use the decoder to decode the encoded noise measurement signal; and

to use the active noise cancelling processor to generate a combined audio and anti-noise signal; and

when connected to an audio headset not adapted for active noise cancelling;

to receive one of an unencoded microphone signal and a null signal from the audio headset via the terminal; and

to generate an audio signal not including an anti-noise signal.

10. The active noise cancelling audio processing device of claim 9, wherein the connector comprises a 3.5 mm audio socket.

11. The active noise cancelling audio processing device of claim 9, wherein the decoder is operable to receive an audio headset identifier signal via the terminal and to enable or disable decoding of the input signal according to a content of the audio headset identifier signal.

12. The active noise cancelling audio processing device of claim 9, the connector comprising a further terminal for carrying a headphone signal and an identifying signal, and wherein

a further output of the decoder is coupled to the further terminal, and

the decoder is operable to transmit an identifying signal to a compatible audio headset.

14. A mobile phone comprising the active noise cancelling audio processing device of claim 9.

15. An MP3 player comprising the active noise cancelling audio processing device of claim 9.