MULTIPLE OUTPUT AUDIO SYSTEM

• US 20080165985A1
• Filed: 01/09/2007
• Published: 07/10/2008
• Est. Priority Date: 01/09/2007
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Hsu, Kuang-Hui, Hsu, Chien-Hua, Chang, Pei-Chen
• Granted Patent: US 8,855,795 B2
• Time in Patent Office: Days
• US Class Current: 381/104
• CPC Class Codes: H04H 60/04 Studio equipment; Interconnection of studios
• CPC Class Codes: H04R 2420/01 Input selection or mixing for amplifiers or loudspeakers for hearing aids H04R25/43
• CPC Class Codes: H04R 5/04 Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments combinations of amplifiers H03F3/68; stereophonic systems H04S
• CPC Class Codes: H04S 3/008 in which the audio signals are in digital form, i.e. employing more than two discrete digital channels data reduction aspects thereof based on psychoacoustics G10L19/02

Abstract

The invention provides a multiple audio output system comprising a second input buffer storing a second data stream output from a demodulation unit or a demultiplexing unit, a second processing unit receiving and processing the second data stream to output a third data stream, a data buffer receiving a third data stream from the second processing unit, a multiplexer having input terminals receiving a first audio signal and the third data stream, and an output terminal outputting an output data stream, and a first processing unit receiving and processing the output data stream to output a first output signal to drive a first output device. The second processing unit further comprises a second decoder receiving and decoding the second data stream, and a second post processing unit receiving and processing the decoded second data stream to output a second output signal to drive a second output device.

Claims

1. A multiple output audio system, comprising:

a second input buffer buffering a second data stream;

a second processing unit processing the second data stream received from the second input buffer, outputting a third data stream and a second output signal, wherein the second processing unit comprises;

a second decoder receiving and decoding the second data stream; and

a second post-processing unit receiving and processing the decoded second data stream to output the second output signal to drive a second output device;

a data buffer receiving the third data stream from the second processing unit;

a multiplexer having input terminals receiving a first audio signal and the third data stream from the data buffer, and an output terminal outputting an output data stream; and

a first processing unit coupled to the output terminal of the multiplexer, receiving and processing the output data stream to output a first output signal to drive a first output device.

2. The system as claimed in claim 1, the first processing unit further comprising:

a first decoder receiving and decoding the output data stream; and

a first post processing unit receiving and processing the decoded output data stream to output the first output signal.

3. The system as claimed in claim 2, wherein the first post-processing unit performs a surrounding effect processing, volume control, echo processing, trim, bass management, equalization, time shifting, fade-in/fade-out, or channel delay task.

4. The system as claimed in claim 1, further comprising a processing unit coupled between the second processing unit and the data buffer for processing the third data stream.

5. The system as claimed in claim 4, the processing unit is an encoder.

6. The system as claimed in claim 5, further comprising a decoder coupled between the data buffer and the multiplexer.

7. The system as claimed in claim 4, the processing unit is an encrypting unit.

8. The system as claimed in claim 1, further comprising a first input buffer for buffering the first audio signal.

9. The system as claimed in claim 1, further comprising a sampling unit for digitizing an analog TV audio signal into the second data stream.

10. The system as claimed in claim 1, further comprising a demultiplexing unit for demultiplexing a digital TV audio signal to generate the second data stream.

11. The system as claimed in claim 1, wherein the data buffer comprises a dynamic random access memory (DRAM), static random access memory (SRAM), a PCM data buffer, or a hard disk.

12. The system as claimed in claim 1, wherein the second post processing unit processes a surrounding effect processing, volume control, echo processing, trim, bass management, equalizer, time shift, or delay task.

13. The system as claimed in claim 1, wherein the third data stream is generated by the second decoder or the second post processing unit.

14. The system as claimed in claim 1, wherein the first processing unit comprises a first output buffer buffering the first output signal.

15. The system as claimed in claim 1, wherein the second processing unit comprises a second output buffer buffering the second output signal.

16. A controlling method for a multiple audio output system, wherein the multiple audio output system comprises a first processing unit receiving and processing a first signal, and a second processing unit, comprising:

stopping the first processing unit;

fading out an output signal of the first processing unit;

switching the input of the first processing unit from the first signal to a third signal, wherein the third signal is generated by the second processing unit;

starting processing the third signal by the first processing unit; and

fading in the output signal of the first processing unit.

17. The method as claimed in claim 16, further comprising:

applying a channel delay procedure on the second processing unit for synchronizing output signals of the first processing unit and the second processing unit.

18. The method as claimed in claim 16, wherein the third signal is buffered before inputting to the first processing unit.

19. The method as claimed in claim 16, wherein the output signal of the first processing unit is played by a speaker, and the output signal of the second processing unit is output via a scart connector.