Method and apparatus for an in-vehicle audio system

• US 20040078104A1
• Filed: 10/22/2002
• Published: 04/22/2004
• Est. Priority Date: 10/22/2002
• Status: Abandoned Application

• Current Assignee: Hitachi Semiconductor Incorporated (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamamoto, Tatsuo, Nguyen, Cong
• Application Number:
  US10/278,586
• Publication Number:
  US 20040078104A1
• Time in Patent Office: Days
• US Class Current: 700/94
• CPC Class Codes: H03G 3/3078 Circuits generating control signals for digitally modulated signals

Abstract

An in-vehicle audio system provides audio paths for a variety of audio sources. Volume control is provided to vary the volume level of audible sound of one or more audio sources when produced by a plurality of speakers. Audio path control is provided to enable communication with a communication device to occur at the same time the audio is delivered to the speakers.

Claims

1. A method for operating an in-vehicle audio system to provide audio to occupants in a vehicle comprising:

receiving first audio information;

producing a first audio signal from the first audio information;

providing the first audio signal to a first speaker system and to a second speaker system;

receiving second audio information;

producing a second audio signal from the second audio information; and

in response to receiving the second audio information, altering the first audio signal to produce an altered-volume signal, mixing the altered-volume signal and the second audio signal to produce a mixed audio signal, and providing the mixed audio signal to the first speaker system.

2. The method of claim 1 wherein a volume level of a first sound corresponding to the altered-volume signal is lower than a volume level of a second sound corresponding to the first audio signal, the first sound being produced by the first speaker system, the second sound being produced by the second speaker system.

3. The method of claim 1 wherein the first audio information is a digital signal and the step of producing the first audio signal includes converting the digital signal to produce an analog signal.

4. The method of claim 1 wherein the first audio information is received by a first coder-decoder (codec) device and the second audio signal is received by a second codec device.

5. The method of claim 1 wherein the altered-volume signal in the mixed audio signal is substantially muted.

6. The method of claim 1 further including altering the second audio signal to produce a second altered-volume signal, mixing the second altered-volume signal and the second audio signal to produce a second mixed audio signal, and providing the second mixed audio signal to the second speaker system.

7. The method of claim 1 further including receiving a volume control signal, wherein a volume level associated with the altered-volume signal is determined based on the volume control signal.

8. The method of claim 1 wherein the first audio information is provided by a compact disc player, a radio tuner, an audio tape player, or an MP3 source.

9. The method of claim 1 wherein the second audio information is provided by a navigation system or a telephonic device.

10. The method of claim 1 wherein the second audio information is an audio output of a telephonic device, the method further including receiving an ambient noise signal, receiving a speaker voice signal, performing noise cancellation on the speaker voice signal based on the ambient noise signal to produce a noise-reduced speaker voice signal, and providing the noise-reduced speaker voice signal to a voice input of the telephonic device.

11. A method of producing audio in a vehicle comprising:

receiving first audio information;

producing a first audible sound at a first location in the vehicle, the first audible sound comprising a first sound component corresponding to the first audio information and having a first volume level;

producing a second audible sound at a second location in the vehicle, the second audible sound comprising a second sound component corresponding to the first audio information and having a second volume level;

receiving second audio information; and

in response to receiving the second audio information, producing a third audible sound at the first location in the vehicle, the third audible sound comprising a third sound component and a fourth sound component, the third sound component corresponding to the first audio information and having a third volume level, the fourth sound component corresponding to the second audio information and having a fourth volume level,

wherein the first volume level is greater than the third volume level.

12. The method of claim 11 wherein the step of producing a third audible sound includes processing the first audio information through a first coder/decoder (codec) device to produce a first audio signal, processing the second audio information through a second codec device to produce a second audio signal, and mixing the first and second audio signals to produce a mixed signal, wherein the third audible sound is generated from the mixed signal.

13. The method of claim 11 wherein the first volume level is substantially equal to the second volume level.

14. The method of claim 11 wherein the first volume level is different from the second volume level.

15. The method of claim 11 wherein the step of producing a first audible sound includes providing a first audio signal to a first speaker system and the step of producing a second audible sound includes providing a second audio signal to a second speaker system.

16. The method of claim 11 wherein the first location is a front portion of the vehicle and the second location is a rear portion of the vehicle.

17. The method of claim 11 further including, in response to receiving the second audio information, producing a fourth audible sound at the second location in the vehicle, the fourth audible sound comprising a fifth sound component and a sixth sound component, the fifth sound component representative of the first audio information and having a fifth volume level, the sixth sound component representative of the second audio information and having a sixth volume level.

18. The method of claim 11 wherein the first and second audio information are first and second digital signals, respectively.

19. An in-vehicle audio system comprising audio circuitry operative to provide audio signals to a first speaker system and to a second speaker system, the audio circuitry comprising:

a first circuit operable to receive first audio information and configured to provide the first audio information to the first speaker system along a first audio path, the first circuit configured to provide the first audio information to the second speaker system along a second audio path;

a second circuit operable to receive second audio information;

a mixer circuit operable to produce a mixed signal representative of a combination of the first audio information and the second audio information, the mixer configured to provide the mixed signal to the first speaker along a third audio path; and

a first volume control component operable to reduce a volume level of a first sound produced by the first speaker system when the first speaker system receives the mixed signal, wherein the sound corresponds to the first audio information,

the first volume control component being configured to vary the volume level in response to presence of the second audio information.

20. The audio circuitry of claim 19 further comprising a second volume control component operable to reduce a volume level of a second sound produced by the second speaker system when the second speaker system receives the mixed signal, wherein the sound corresponds to the first information,

the second volume control component being configured to vary the volume level in response to presence of the second audio information.

21. The audio circuitry of claim 19 wherein the first audio information originates from a compact disc player, a radio tuner, an audio tape player, or an MP3 source.

22. The audio circuitry of claim 19 wherein the second audio information originates from navigation system or a telephonic device.

23. The audio circuitry of claim 19 wherein the first and second circuitry each is a coder/decoder (codec) device.

24. An in-vehicle audio system comprising an audio control component, a first speaker system and a second speaker system, the audio control component comprising:

first means for processing first audio information, the first means having first and second outputs;

second means for processing second audio information, the second means having first and second outputs;

first path means for providing an audio signal from the first output of the first means and an audio signal from the second output of the second means to the first speaker system to produce a first sound; and

second path means for providing at least an audio signal from the second output of the first means to the second speaker system to produce a second sound,

wherein the first means is operable to alter the audio signal from its first output such that the first audio information produced in the first sound has a lower volume than the first audio information produced in the second sound when the second audio information is present.

25. The in-vehicle audio system of claim 24 wherein the first means is a first coder/decoder and the second means is a second coder/decoder.

26. The in-vehicle audio system of claim 24 wherein the first path means includes a mixer circuit having:

a first input coupled to receive the audio signal from the first output of the first means;

a second input coupled to receive the audio signal from the first output of the second means; and

an output coupled provide a mixed signal to the first speaker system,

the mixer circuit operative to produce the mixed signal from the audio signals.