Manipulating spatial processing in an audio system
A vehicle audio system that includes a source of audio signals, which may include both entertainment audio signals and announcement audio signals, speakers for radiating audio signals, and spatial enhancement circuitry comprising circuitry to avoid applying spatial enhancement processing to the announcement audio signals.
1. A vehicle audio system comprising:
an input for receiving input audio signals;
an announcement audio extractor configured to extract announcement audio content from the input audio signals and output the extracted announcement audio content and entertainment audio content remaining in the input audio signals after extraction of the announcement audio content;
a spatial processor configured to receive the entertainment audio content from the announcement audio extractor and apply spatial processing to the entertainment audio content to output spatially processed entertainment audio content; and
an output matrixer configured to
receive the announcement audio content from the announcement audio extractor and the spatially processed entertainment audio content from the spatial processor, and
combine the announcement audio content and the spatially processed entertainment audio content to generate output audio signals; and
an output for providing the output audio signals,
wherein the input receives front and rear input audio signals, and
the announcement audio extractor compares at least one front audio input signal to at least one rear audio input signal and extracts the difference between the compared front and rear audio input signals as the announcement audio content, and inserts the announcement audio signal in the front audio signal only.
2. The vehicle audio system of claim 1 , further comprising speakers for radiating the output audio signals.
3. The vehicle audio system of claim 1 , wherein the spatial processor is configured to apply the spatial processing by adding channels to the entertainment audio content.
4. The vehicle audio system of claim 1 , wherein the spatial processor is configured to apply the spatial processing by widening the sound stage of the entertainment audio content.
5. The vehicle audio system of claim 1 , wherein
the input audio signals include front audio signals and rear audio signals; and
the spatial processor is configured to apply the spatial processing by applying fader settings to the front and rear audio signals.
6. A method for operating a vehicle audio system comprising:
receiving input audio signals;
extracting announcement audio content from the input audio signals;
applying spatial processing to entertainment audio content remaining in the input audio signals after extraction of the announcement audio content;
combining the extracted announcement audio content and the spatially processed entertainment audio content to generate output audio signals; and
outputting the output audio signals,
wherein the input audio signals comprise front and rear audio signals, and
extracting the announcement audio content comprises comparing at least one front audio signal to at least one rear audio signal and extracting the difference between the compared front and rear audio signals as the announcement audio content, and inserting the announcement audio signal in the front audio signal only.
7. The method of claim 6 , further comprising operating speakers to radiate the output audio signals.
8. The method of claim 6 , wherein applying spatial processing comprises adding channels to the entertainment audio content.
9. The method of claim 6 , wherein applying spatial processing comprises widening the sound stage of the entertainment audio content.
10. The method of claim 6 , wherein
the input audio signals include front audio signals and rear audio signals; and
applying spatial processing comprises applying fader settings to the front and rear audio signals.
11. A vehicle audio amplifier comprising:
input terminals for receiving input audio signals; and
an announcement audio extractor configured to extract announcement audio content from the input audio signals and output the extracted announcement audio content and entertainment audio content remaining in the input audio signals after extraction of the announcement audio content;
a spatial processor configured to receive the entertainment audio content from the announcement audio extractor and apply spatial processing to the entertainment audio content to output spatially processed entertainment audio content;
an output matrixer configured to
receive the announcement audio content from the announcement audio extractor and the spatially processed entertainment audio content from the spatial processor, and
combine the announcement audio content and the spatially processed entertainment audio content to generate output audio signals;
an output amplifier stage configured to amplify the output audio signals; and
output terminals for providing the output audio signals,
wherein the input terminals comprise at least two input terminals for receiving front and rear input audio signals, and
the announcement audio extractor compares at least one front audio input signal to at least one rear audio input signal and extracts the difference between the compared front and rear audio input signals as the announcement audio content, and inserts the announcement audio signal in the front audio signal only.
12. The vehicle audio amplifier of claim 11 , wherein the spatial processor is configured to apply the spatial processing by adding channels to the entertainment audio content.
13. The vehicle audio amplifier of claim 11 , wherein the spatial processor is configured to apply the spatial processing by widening the sound stage of the entertainment audio content.
14. The vehicle audio amplifier of claim 11 , wherein
the input audio signals include front audio signals and rear audio signals; and
the spatial processor is configured to apply the spatial processing by applying fader settings to the front and rear audio signals.