Method And System For Mixing A Plurality Of Audio Sources In An FM Transmitter

Abstract

A plurality of digital audio signals from a plurality of sources utilizing different clocks may be processed and transmitted via an FM transmitter. The plurality of signals may have different sample rates which are converted to one same sample rate by a plurality of rate adapters. The plurality of rate adapters may be clocked at one same sample rate. The energy levels of the signals may be adjusted relative to one another and as a group. Energy level adjustments may improve FM modulation signal characteristics and audible energy levels for an end listener. The plurality of digital audio signals may be combined into one composite signal and FM modulated in the digital domain. The FM modulated signal may be converted to analog signal prior to being filtered, amplified and coupled to an antenna for transmission.

1 . A method for processing signals, the method comprising:
 converting in an FM radio, sampling rates for a plurality of input digital audio signals to a common sampling rate; and   combining within said FM radio, a corresponding plurality of converted digital signals resulting from said conversion into a single composite digital audio signal.   
   
   
       2 . The method according to  claim 1 , comprising adjusting an energy level of at least a portion of said corresponding plurality of converted digital signals. 
   
   
       3 . The method according to  claim 1 , comprising adjusting an energy level of each of said corresponding plurality of converted digital signals relative to each other. 
   
   
       4 . The method according to  claim 1 , comprising adjusting an energy level of each of said corresponding plurality of converted digital signals prior to said combining and prior to FM modulation. 
   
   
       5 . The method according to  claim 1 , comprising adjusting an energy level of each of said corresponding plurality of converted digital signals subsequent to said combining and prior to FM modulation 
   
   
       6 . The method according to  claim 1 , wherein at least one of said plurality of input digital audio signals is clocked by a clock source that differs from at least a remaining portion of said plurality of input digital audio signals. 
   
   
       7 . The method according to  claim 1 , comprising clocking a plurality of rate adapters utilized for said conversion at a common clock rate. 
   
   
       8 . The method according to  claim 1 , comprising FM modulating said combined corresponding plurality of converted digital signals in digital domain. 
   
   
       9 . The method according to  claim 8 , comprising converting said FM modulated combined corresponding plurality of converted digital signals to an analog signal. 
   
   
       10 . The method according to  claim 9 , comprising transmitting said analog signal. 
   
   
       11 . A system for processing signals, the system comprising:
 at least one processor that enables:
 conversion of sampling rates for a plurality of input digital audio signals to a common sampling rate within an FM radio; and 
 combining within said FM radio, a corresponding plurality of converted digital signals resulting from said conversion into a single composite digital audio signal. 
   
   
   
       12 . The system according to  claim 11 , wherein said at least one processor enables adjustment of an energy level of at least a portion of said corresponding plurality of converted digital signals. 
   
   
       13 . The system according to  claim 11 , wherein said at least one processor enables adjustment an energy level of each of said corresponding plurality of converted digital signals relative to each other. 
   
   
       14 . The system according to  claim 11 , wherein said at least one processor enables adjustment of an energy level of each of said corresponding plurality of converted digital signals prior to said combining and prior to FM modulation. 
   
   
       15 . The system according to  claim 11 , wherein said at least one processor enables adjustment of an energy level of each of said corresponding plurality of converted digital signals subsequent to said combining and prior to FM modulation 
   
   
       16 . The system according to  claim 11 , wherein said at least one processor enables, clocking of at least one of said plurality of input digital audio signals by a clock source that differs from at least a remaining portion of said plurality of input digital audio signals. 
   
   
       17 . The system according to  claim 11 , wherein said at least one processor enables clocking a plurality of rate adapters utilized for said conversion at a common clock rate. 
   
   
       18 . The system according to  claim 11 , wherein said at least one processor enables FM modulation of said combined corresponding plurality of converted digital signals in digital domain. 
   
   
       19 . The system according to  claim 18 , wherein said at least one processor enables conversion said FM modulated combined corresponding plurality of converted digital signals to an analog signal. 
   
   
       20 . The system according to  claim 19 , wherein said at least one processor enables transmission of said analog signal. 
   
   
       21 . A machine-readable storage having stored thereon, a computer program having at least one code section for processing signals, the at least one code section being executable by a machine for causing the machine to perform steps comprising:
 converting in an FM radio, sampling rates for a plurality of input digital audio signals to a common sampling rate; and   combining within said FM radio, a corresponding plurality of converted digital signals resulting from said conversion into a single composite digital audio signal.   
   
   
       22 . The machine-readable storage according to  claim 21 , wherein said at least one code section comprises code for adjusting an energy level of at least a portion of said corresponding plurality of converted digital signals. 
   
   
       23 . The machine-readable storage according to  claim 21 , wherein said at least one code section comprises code for adjusting an energy level of each of said corresponding plurality of converted digital signals relative to each other. 
   
   
       24 . The machine-readable storage according to  claim 21 , wherein said at least one code section comprises code for adjusting an energy level of each of said corresponding plurality of converted digital signals prior to said combining and prior to FM modulation. 
   
   
       25 . The machine-readable storage according to  claim 21 , wherein said at least one code section comprises code for adjusting an energy level of each of said corresponding plurality of converted digital signals subsequent to said combining and prior to FM modulation 
   
   
       26 . The machine-readable storage according to  claim 21 , wherein said at least one code section comprises code for clocking at least one of said plurality of input digital audio signals by a clock source that differs from at least a remaining portion of said plurality of input digital audio signals. 
   
   
       27 . The machine-readable storage according to  claim 21 , wherein said at least one code section comprises code for clocking a plurality of rate adapters utilized for said conversion at a common clock rate. 
   
   
       28 . The machine-readable storage according to  claim 21 , wherein said at least one code section comprises code for FM modulating said combined corresponding plurality of converted digital signals in digital domain. 
   
   
       29 . The machine-readable storage according to  claim 28 , wherein said at least one code section comprises code for converting said FM modulated combined corresponding plurality of converted digital signals to an analog signal. 
   
   
       30 . The machine-readable storage according to  claim 29 , wherein said at least one code section comprises code for transmitting said analog signal.