Vehicle computer system audio entertainment system
First Claim
1. A vehicle computer system comprising:
- a voice input device to generate analog voice data;
a converter to convert the analog voice data to digital voice data at a first sampling rate;
a logic unit coupled to receive the digital voice data from the converter and to output the digital voice data as a serial stream piggybacked with a command stream via a serial peripheral interface (SPI);
an audio processor connected to receive the serial stream and to resample the digital voice data at a second sampling rate, the audio processor returning the resampled digital voice data as a serial stream piggybacked with the command stream back to the SPI of the logic unit; and
the logic unit transferring the resampled digital voice data to a speech recognition system for processing.
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Accused Products
Abstract
A vehicle computer system has an audio entertainment system implemented in a logic unit and audio digital signal processor (DSP) independent from the host CPU. The audio entertainment system employs a set of ping/pong buffers and direct memory access (DMA) circuits to transfer data between different audio devices. Audio data is exchanged using a mapping overlay technique, in which the DMA circuits for two audio devices read and write to the same memory buffer. The computer system provides an audio manager API (application program interface) to enable applications running on the computer to control the various audio sources without knowing the hardware and implementation details of the underlying sound system. Different audio devices and their drivers control different functionality of the audio system, such as equalization, volume controls and surround sound decoding. The audio manager API transfers calls made by the applications to the appropriate device driver(s). The computer system also supports a speech recognition system. Speech utterances are picked up by a microphone and sampled at an internal sampling rate. However, the speech recognition system employs a lower sampling rate. The computer system converts microphone data from the higher internal sampling rate to the desired sampling rate by piggybacking the microphone data on command/message streams to an SPI (serial peripheral interface) of the audio DSP. The DSP performs normal low-pass filtering and down sampling on the data stream and then uses the SPI to send out the microphone data at the lower sampling rate.
120 Citations
20 Claims
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1. A vehicle computer system comprising:
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a voice input device to generate analog voice data; a converter to convert the analog voice data to digital voice data at a first sampling rate; a logic unit coupled to receive the digital voice data from the converter and to output the digital voice data as a serial stream piggybacked with a command stream via a serial peripheral interface (SPI); an audio processor connected to receive the serial stream and to resample the digital voice data at a second sampling rate, the audio processor returning the resampled digital voice data as a serial stream piggybacked with the command stream back to the SPI of the logic unit; and the logic unit transferring the resampled digital voice data to a speech recognition system for processing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle computer system comprising:
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a voice input device to generate analog voice data; a converter to convert the analog voice data to digital voice data at a first sampling rate; a logic unit coupled to receive the digital voice data from the converter and to output the digital voice data as a serial stream piggybacked with a message stream via a serial peripheral interface (SPI); an audio processor connected to receive the serial stream and to resample the digital voice data at a second sampling rate, the audio processor returning the resampled digital voice data as a serial stream piggybacked with the message stream back to the SPI of the logic unit; and the logic unit transferring the resampled digital voice data to a speech recognition system for processing. - View Dependent Claims (11, 12, 13)
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14. A method of supporting a speech recognition system in a vehicle, comprising:
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converting analog voice data to digital voice data at a first sampling rate; receiving the digital voice data in a logic unit; outputting the digital voice data from the logic unit to an audio processor as a serial stream piggybacked with a command stream via a serial peripheral interface (SPI); resampling the digital voice data at a second sampling rate at the audio processor; returning the resampled digital voice data from the audio processor as a serial stream piggybacked with the command stream back to the SPI of the logic unit; and transferring the resampled digital voice data to the speech recognition system for processing. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification