Personal audio playback device having gain control responsive to environmental sounds

• US 7,903,825 B1
• Filed: 03/03/2006
• Issued: 03/08/2011
• Est. Priority Date: 03/03/2006
• Status: Active Grant

• Current Assignee: Cirrus Logic Incorporated
• Original Assignee: Cirrus Logic Incorporated
• Inventors: Melanson, John L.
• Primary Examiner(s): Chin; Vivian
• Assistant Examiner(s): Fahnert; Friedrich
• Application Number:
  US11/367,224
• Time in Patent Office: 1,831 Days
• Field of Search: 381/57, 381/74, 381/106, 381/103, 381/108, 375/260, 375/346, 455/186.1, 455/343, 455/550.1, 367/136, 345/619, 725/47
• US Class Current: 381/57
• CPC Class Codes: G10L 15/20 Speech recognition techniques specially adapted for robustness in adverse environments, e.g. in noise, of stress induced speech G10L21/02 takes precedence
• CPC Class Codes: H03G 3/32 the control being dependent upon ambient noise level or sound level
• CPC Class Codes: H03G 9/005 of digital or coded signals
• CPC Class Codes: H03G 9/025 frequency-dependent volume compression or expansion, e.g. multiple-band systems H03G9/10, H03G9/18 take precedence

Abstract

A personal audio playback device having gain control responsive to environmental sounds provides for improved enjoyment of program material played back through headphones, while further providing features for personal safety and communications with others. A microphone is incorporated on the surface of the playback device, which includes an audio output connection for headphones and internal storage for audio program material. The entire device may be incorporated within the headphones, or the headphones may connect through a connector on the housing of the device. The gain, type or position of the program material is controlled in conformity with a detected characteristic of ambient sounds received by the microphone, which may be the amplitude of the signals in one or more frequency bands, or a particular type of sound, such as speech or vehicular sounds. Multiple modes are selectable for processing the audio, selecting program material type and/or re-positioning the program material.

Claims

1. A portable consumer audio playback device, comprising:

a compact consumer audio device housing;

an audio output adapted for connection to headphones for transforming one or more output electrical signals to sound;

a microphone input for connection to a microphone element for sensing ambient sounds external to said housing and producing an ambient measuring audio signal;

an audio program source for providing input of audio program information, wherein said audio program information is stored within said housing;

an audio processor for detecting an event in said ambient sounds from said ambient measuring audio signal and adjusting a characteristic of said audio program information in response to detection of said event to produce said one or more output electrical audio signals;

a control circuit coupled to an output of said processor for controlling playback position of said audio program information, and wherein said processor further determines when said audio program information is substantially interrupted by action of said processor in response to said detected event and automatically resumes playback of said audio program information after said action of said processor in response to said detected event has ceased at a playback position substantially corresponding to the beginning of said interrupting action; and

a battery receptacle within said housing for accepting a battery for supplying power to said portable personal audio device.

2. The device of claim 1, further comprising a mode selector for selecting a processing mode, wherein in response to selection of a particular operating mode said audio processor partially or completely attenuates said audio program information in response to detection of said event.

3. The device of claim 1, wherein said audio processor further detects a characteristic of said audio program information, and further processes said audio program information in conformity with said detected characteristic of said audio program information.

4. The device of claim 1, wherein said processor further distinguishes the event as one to which a wearer of said device should be alerted, and wherein said processor delivers said ambient sound to said audio output and attenuates said audio program information in response to detection of the event.

5. The device of claim 4, wherein said processor distinguishes said event in said ambient sounds as speech when said processor is in a mode selected as a social mode, whereby conversations can be conducted with a user of said device.

6. The device of claim 4, wherein said processor distinguishes said event in said ambient sounds as hazard indications speech when said processor is in a mode selected as a personal safety social mode, whereby a user of said device is alerted to said hazard indications.

7. The device of claim 1, further comprising a transceiver for communicating with another audio reproduction device equipped with a receiver, wherein said processor distinguishes said event within said ambient sounds as speech of a user of said device, and wherein said processor delivers said ambient measuring audio signal to said transceiver for transmission to said other audio reproduction device in response to said processor detecting said speech of said user, when said processor is in a mode selected as a linked chat mode.

8. The device of claim 1, further comprising a transceiver for communicating with another audio reproduction device equipped with a receiver, wherein said processor is responsive to receptions made by said transceiver, and wherein said processor delivers said ambient measuring audio signal to said transceiver for transmission to said other audio reproduction device and delivers said reception to said audio output, when said processor is in a mode selected as a linked chat mode.

9. The device of claim 1, further comprising at least one other microphone, wherein said audio processor further detects a directionality and wherein said adjusting another characteristic is further qualified by said detected directionality.

10. The device of claim 1, further comprising a program selector for selecting said audio program information, and wherein said program selector selects said audio program information in conformity said detected event.

11. The device of claim 1, wherein said compact consumer audio device housing houses at least one headphone element, and wherein said audio output is adapted for connection to headphones at least in part by an internal connection within said housing.

12. The device of claim 11, wherein said compact consumer audio device housing further houses said microphone.

13. The device of claim 1, further comprising a connector disposed on an external surface of said compact consumer audio device housing for connecting said headphones.

14. The device of claim 11, wherein said connector also includes electrical connections for connecting said microphone element.

15. The device of claim 1, further comprising a connector disposed on an external surface of said compact consumer audio device housing for connecting said microphone.

16. The device of claim 1, wherein said audio processor includes an audio analog-to-digital converter having a selectable power consumption mode, and wherein said audio processor selects a lower power consumption mode of said analog-to-digital converter when said audio processor is detecting a characteristic of said ambient sounds.

17. The device of claim 16, wherein said device has a selectable recording mode, and wherein said audio processor selects a higher power consumption mode of said analog-to-digital converter when said device is in said recording mode.

18. The device of claim 16, wherein said lower power consumption mode is a mode in which at least one of a preamplifier amplifying said ambient measuring audio signal and said audio analog-to-digital converter are disabled, and wherein said audio processor periodically enables said at least one of said preamplifier and said audio analog-to-digital converter when said audio processor is detecting a characteristic of said ambient sounds, wherein said detecting is performed periodically.

19. A portable consumer audio playback device, comprising:

a compact consumer audio device housing;

an audio output adapted for connection to headphones for transforming one or more output electrical signals to sound;

a microphone input for connection to a microphone element for sensing ambient sounds external to said housing and producing an ambient measuring audio signal;

an audio program source for providing input of audio program information, wherein said audio program information is stored within said housing and comprises multiple audio program information types;

an ambient characteristic detector for detecting a characteristic of said ambient sounds from said ambient measuring audio signal;

a control circuit for automatically selecting the audio program information from among said multiple program types for compatibility with said ambient sounds in conformity with said detected characteristic; and

a battery receptacle within said housing for accepting a battery for supplying power to said portable personal audio device.

20. An electronic audio device, comprising:

an analog-to-digital converter having selectable operating modes with corresponding differing power consumption levels;

a control circuit for selecting between said selectable operating modes of said analog-to-digital converter;

at least one microphone coupled to said analog-to-digital converter, wherein said at least one microphone is provided for monitoring background noise and for providing input of other sounds, and wherein said control circuit selects a lower power consumption operating mode of said analog-to-digital converter when said microphone is monitoring said background noise and a higher power consumption mode when said at least one microphone is providing input of said other sounds.

21. The device of claim 20, wherein said lower power consumption operating mode is a lower sampling rate operating mode.

22. The device of claim 20, wherein said lower power consumption operating mode is a lower bit-depth operating mode.

23. A portable consumer audio playback device, comprising:

a compact consumer audio device housing;

an audio output adapted for connection to headphones for transforming one or more output electrical signals to sound;

a microphone input for connection to a microphone element for sensing ambient sounds external to the housing and producing an ambient measuring audio signal;

an audio program source for providing input of audio program information, wherein the audio program information is stored within the housing;

an audio processor for detecting a first characteristic of the ambient sounds from the ambient measuring audio signal, detecting a second characteristic of the audio program information that is independent of the first characteristic of the ambient sounds, and adjusting a third characteristic of the audio program information in conformity with the detected first characteristic of the ambient sounds and the detected second characteristic of the audio program information to produce the one or more output electrical audio signals; and

a battery receptacle within the housing for accepting a battery for supplying power to the portable personal audio device.

24. The device of claim 23, wherein the audio processor detects the characteristic of the ambient sounds for each of a plurality of frequency bands, further detects a level of the audio program information in corresponding frequency bands and further implements a multi-frequency band compressor having bands corresponding to the plurality of frequency bands for independently compressing the audio program information in each band, and wherein an amount of compression applied within each band of the multi-frequency band compressor is determined in conformity with both the detected characteristic of the ambient sounds for each corresponding frequency band and the detected level of the audio program information in the corresponding frequency bands.

25. The device of claim 23, further comprising a control circuit for selecting the audio program information from among the multiple program types for compatibility with the ambient sounds in conformity with the detected first characteristic, and wherein the adjusting a third characteristic comprises selecting the audio program information.

26. The device of claim 23, further comprising a control circuit coupled to an output of the processor for controlling playback position of the audio program information, and wherein the processor further determines when the audio program information is substantially interrupted by action of the processor in response to the detected characteristic of the ambient sounds and resumes playback of the audio program information after the action of the processor in response to the detected characteristic of the ambient sound has ceased at a playback position corresponding to the beginning of the interrupting action.

27. A portable consumer audio playback device, comprising:

a compact consumer audio device housing;

an audio output adapted for connection to headphones for transforming one or more output electrical signals to sound;

a microphone input for connection to a microphone element for sensing ambient sounds external to the housing and producing an ambient measuring audio signal;

an audio program source for providing input of audio program information, wherein the audio program information is stored within the housing;

an audio processor for detecting an event in the ambient sounds from the ambient measuring audio signal and adjusting a characteristic of the audio program information in response to detection of the event to produce the one or more output electrical audio signals;

a transceiver for communicating with another audio reproduction device equipped with a receiver, wherein the processor distinguishes the event within the ambient sounds as speech of a user of the device, and wherein the processor delivers the ambient measuring audio signal to the transceiver for transmission to the other audio reproduction device in response to the processor detecting the speech of the user, when the processor is in a mode selected as a linked chat mode; and

a battery receptacle within the housing for accepting a battery for supplying power to the portable personal audio device.

28. A portable consumer audio playback device, comprising:

a compact consumer audio device housing;

an audio output adapted for connection to headphones for transforming one or more output electrical signals to sound;

microphone inputs for connection of at least two microphone element for sensing ambient sounds external to the housing and producing multiple ambient measuring audio signals;

an audio program source for providing input of audio program information, wherein the audio program information is stored within the housing;

an audio processor for detecting an event in the ambient sounds from the ambient measuring audio signals and adjusting a characteristic of the audio program information in response to detection of the event to produce the one or more output electrical audio signals, wherein the audio processor further detects a directionality of the event from the multiple ambient measuring audio signals and wherein the adjusting another characteristic is further qualified by the detected directionality; and

a battery receptacle within the housing for accepting a battery for supplying power to the portable personal audio device.