Method and apparatus for digital mixing of audio signals in multimedia platforms
First Claim
Patent Images
1. A digital multimedia system for producing a combined digital output signal from multiple signal sources, comprising:
- a first input, for receiving a first digital input signal having a first sampling rate;
a second input, for receiving a second digital input signal having a second sampling rate that differs from the first sampling rate;
a pre-processing circuit, having a plurality of inputs and outputs, a first pre-processing circuit input receiving the first digital input signal, a second pre-processing circuit input receiving the second digital input signal, a first pre-processing circuit output providing the first digital input signal at the first sampling rate, the preprocessing circuit including a sampling rate modification circuit for receiving the second digital input signal at the second sampling rate, converting the sampling rate of the second digital input signal from the second sampling rate to the first sampling rate, and outputting the second digital input signal at the first sampling rate to a second pre-processing circuit output; and
,a mixer circuit, having a plurality of inputs and an output, a first mixer circuit input receiving, from the first pre-processing circuit output, the first digital signal at the first sampling rate, a second mixer circuit input receiving, from the second pre-processing circuit output, the second digital signal at the first sampling rate, the mixer circuit digitally mixing the first and second digital signals to provide a combined digital output signal.
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Abstract
A multimedia method and apparatus is able to digitally mix audio signals to produce combined audio output signals. Prior to digital mixing, the audio input signals are de-formatted using a digital de-formatter, volume adjusted using digital volume controllers and converted to a common sampling rate utilizing a digital interpolator or decimator.
78 Citations
22 Claims
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1. A digital multimedia system for producing a combined digital output signal from multiple signal sources, comprising:
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a first input, for receiving a first digital input signal having a first sampling rate; a second input, for receiving a second digital input signal having a second sampling rate that differs from the first sampling rate; a pre-processing circuit, having a plurality of inputs and outputs, a first pre-processing circuit input receiving the first digital input signal, a second pre-processing circuit input receiving the second digital input signal, a first pre-processing circuit output providing the first digital input signal at the first sampling rate, the preprocessing circuit including a sampling rate modification circuit for receiving the second digital input signal at the second sampling rate, converting the sampling rate of the second digital input signal from the second sampling rate to the first sampling rate, and outputting the second digital input signal at the first sampling rate to a second pre-processing circuit output; and
,a mixer circuit, having a plurality of inputs and an output, a first mixer circuit input receiving, from the first pre-processing circuit output, the first digital signal at the first sampling rate, a second mixer circuit input receiving, from the second pre-processing circuit output, the second digital signal at the first sampling rate, the mixer circuit digitally mixing the first and second digital signals to provide a combined digital output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a system comprising a first input, a second input, a pre-processing circuit, a sampling rate modification circuit, and a mixer circuit, a method for producing a a combined digital output signal from multiple signal sources, the method comprising:
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receiving a first digital input signal having a first sampling rate at the first input; receiving a second digital input signal having a second sampling rate that differs from the first sampling rate at the second input; providing the first digital input signal to a first pre-processing circuit input;
outputting, at a first pre-processing circuit output, the first digital input signal at the first sampling rate;providing the second digital input signal to a second pre-processing circuit input; providing the second digital input signal from the second pre-processing circuit input to a sampling rate modification circuit; converting the sampling rate of the second digital input signal from the second sampling rate to the first sampling rate; outputting, at a second pre-processing circuit output, the second digital input signal at the first sampling rate; providing the first digital input signal at the first sampling rate from the first pre-processing circuit output to a first mixer circuit input; providing the second digital input signal at the first sampling rate from the second pre-processing circuit output to a second mixer circuit input; and digitally mixing the first and second digital signals using the mixer circuit to produce the combined digital output signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification