Audio Sample Rate Converter
Audio sample rate conversion (SRC) or audio resampling is the process of changing the audio sample rate without affecting the quality. Broadcast audio infrastructure equipment typically requires 48-kHz synchronous sampling rate audio signals. However, the audio inputs to the audio equipment can be from sources with different sampling rates. For example, CD audio signals have a sampling rate of 44.1 kHz, while other audio sources have sampling rates from 32 kHz to 192 kHz.
Altera’s SRC core was developed and optimized for Altera® devices and comes with demonstrations for Altera development boards. The audio SRC converts audio signals with different sampling rates into a single, synchronous audio stream sampled at 48 kHz. The design can accept audio signals in either AES3/EBU or I2S format and can be targeted to the low-cost Cyclone® series FPGAs or the high-performance Stratix® series FPGAs. Typical applications of the audio SRC are digital mixing consoles, broadcast studio equipment, and audio workstations.
Block Diagram
Figure 1 shows the audio sample rate converter block diagram.
Figure 1. Audio Sample Rate Converter
Features and Benefits
- Broadcast quality performance
- 24-bit resolution, -120 dB THD+N 32-kHz to 192-kHz input rates
- Senses input sample frequency automatically
- Output sampling frequency range from 32 kHz to 192 kHz
- Support for up to 16 audio channels (8 stereo pairs)
- MegaWizard® Plug-In configurable
- Easy-to-use IP toolbench interface
- Automatic output mute during error condition
- AES3/EBU channel status interfaces (in and out)
- Bypass and secondary mute implemented externally
- AES3/EBU and I2S interface support
- Cost-effective solution
- Can be implemented in both low-cost Cyclone and high-performance Stratix device families
Altera has verified the SRC intellectual property (IP) through software simulation and extensive hardware testing with the state-of-the-art audio analyzer. For more information on this core, contact your local Altera® sales representative.
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