SYSTEM TO PROCESS A PLURALITY OF AUDIO SOURCES

• US 20090192639A1
• Filed: 01/28/2009
• Published: 07/30/2009
• Est. Priority Date: 01/28/2008
• Status: Abandoned Application

• Current Assignee: Merging Technologies SA (Sennheiser Electronic GmbH & Company KG)
• Original Assignee: Merging Technologies SA (Sennheiser Electronic GmbH & Company KG)
• Inventors: VAN KEMPEN, Bertrand, CELLIER, Claude
• Application Number:
  US12/361,348
• Publication Number:
  US 20090192639A1
• Time in Patent Office: Days
• US Class Current: 700/94
• CPC Class Codes: G06F 9/52 Program synchronisation; Mutual exclusion, e.g. by means of semaphores
• CPC Class Codes: H04H 60/04 Studio equipment; Interconnection of studios

Abstract

Today, even despite the huge increase of available processing power, the commercial OS are not able to guarantee the response time necessary to process a plurality of audio sources and output the results in a very short time without using additional means such as dedicated DSP or other processing elements such as FPGA. This problem is overcome by means of a system to process a plurality of audio sources, this system having at least a central processing unit CPU and input and output capabilities, this system being characterized in that, the central processing unit comprises at least two cores, each core representing a micro processing unit, at least one core being loaded with a standard operating system and at least one second core being loaded with a real-time operating system (RTOS) in charge of processing audio signals which comprise audio sources and audio outputs.

Claims

1. A system to process a plurality of audio sources, the system comprising:

a central processing unit comprising at least two cores in a symmetric architecture, each core representing a general purpose micro processing unit of similar design, at least one core being loaded with a standard operating system and at least one second core being loaded with a real-time operating system in charge of processing audio signals which comprise audio inputs and audio outputs, and

an interface connected to the central processing unit.

2. The system of claim 1, wherein the standard operating system comprises audio processing capabilities in charge of processing non-critical audio time response resources.

3. The system of claim 1, wherein the standard operating system comprises audio enhancement routines which are accessible by the real-time operating system via interface communication channels.

4. The system of claim 3, wherein the software interface comprises buffer memories to compensate for a processing time difference between the real-time operating system and the standard operating system.

5. The system of claim 4, wherein the buffer memory is a double buffer having simultaneous read/write protection.

6. The system of claim 1, further comprising at least one audio unit to acquire and/or produce audio signals, said audio unit comprising a block generator configured to produce a block signal to synchronize the real-time operating system.

7. The system according to claim 6, wherein the block generator is configured to adjust a frequency of the block signal is in view of a number of audio signals to be processed.

8. The system according to claim 6, further comprising a network interface to connect the audio unit, said real-time operating system having a dedicated driver to said network interface to manage the data flow of said network interface.

9. The system according to claim 6, comprising a plurality of audio units, one of the audio units being a master audio unit comprising the block generator the other audio units being slave audio units, said operating system having reading and/or writing means to the audio units, said reading and/or writing means being synchronized by the block signal.

10. The system according to claim 6, wherein said slave audio units comprise a PLL clock generator which is synchronized by the reading and/or writing means of the real-time operating system.

11. The system according to claim 8, comprising a plurality of network interfaces which are connected to the audio units, each network interface being pre-loaded with data and being configured to send said data according to trigger information derived from the block signal.

12. The system according to claim 8, it further comprising a switch between the network interface and the plurality of audio units, the real-time operating system being configured to send synchronization information to the audio units via the switch in broadcast mode, said synchronization information being triggered by the block signal.

13. The system according to claim 9, further comprising a switch between the network interface and the audio units, and wherein the master audio unit feeds the slave audio units via a dedicated line.

14. The system according to claim 10, wherein the audio units are serially connected, the delay between the real-time operating system performing a read and/or write operation to the first audio unit and to a further serially connected audio unit being stored in said further serially connected audio unit, said system being configured to use said delay to synchronize the PLL clock generator of said audio unit.