APPARATUS AND METHOD FOR PROCESSING AN AUDIO SIGNAL AND FOR PROVIDING A HIGHER TEMPORAL GRANULARITY FOR A COMBINED UNIFIED SPEECH AND AUDIO CODEC (USAC)

摘要

AN APPARATUS FOR PROCESSING AN AUDIO SIGNAL IS PROVIDED. THE APPARATUS COMPRISES A SIGNAL PROCESSOR (110; 205; 405) AND A CONFIGURATOR (120; 208; 408). THE SIGNAL PROCESSOR (110; 205; 405) IS ADAPTED TO RECEIVE A FIRST AUDIO SIGNAL FRAME HAVING A FIRST CONFIGURABLE NUMBER OF SAMPLES OF THE AUDIO SIGNAL, MOREOVER, THE SIGNAL PROCESSOR (110; 205; 405) IS ADAPTED TO UP SAMPLE THE AUDIO SIGNAL BY A CONFIGURABLE UPSAMPLING FACTOR TO OBTAIN A PROCESSED AUDIO SIGNAL. FURTHERMORE, THE SIGNAL PROCESSOR (110; 205; 405) IS ADAPTED TO OUTPUT A SECOND AUDIO SIGNAL FRAME HAVING A SECOND CONFIGURABLE NUMBER OF SAMPLES OF THE PROCESSED AUDIO SIGNAL. THE CONFIGURATOR(120; 208; 408) IS ADAPTED TO CONFIGURE THE SIGNAL PROCESSOR (110; 205; 405) BASED ON CONFIGURATION INFORMATION SUCH THAT THE CONFIGURABLE UPSAMPLING FACTOR IS EQUAL TO A FIRST UPSAMPLING VALUE WHEN A FIRST RATIO OF THE SECOND CONFIGURABLE NUMBER OF SAMPLES TO THE FIRST CONFIGURABLE NUMBER OF SAMPLES HAS A FIRST RATIO VALUE. MOREOVER, THE CONFIGURATOR (120; 208; 408) IS ADAPTED TO CONFIGURE THE SIGNAL PROCESSOR (110; 205; 405) SUCH THAT THE CONFIGURABLE UPSAMPLING FACTOR IS EQUAL TO A DIFFERENT SECOND UPSAMPLING VALUE, WHEN A DIFFERENT SECOND RATIO OF THE SECOND CONFIGURABLE NUMBER OF SAMPLES TO THE FIRST CONFIGURABLE NUMBER OF SAMPLES HAS A DIFFERENT SECOND RATIO VALUE. THE FIRST OR THE SECOND RATIO VALUE IS NOT AN INTEGER VALUE.