Synchronous and asynchronous ASRC has a broad channel capacity, high conversion ratios,
and fast performance, all with outstanding low distortion.
Woodcliff Lake, New Jersey — April 29, 2025 — Semiconductor intellectual property core
provider CAST today introduced a high-performance Audio Sample Rate Converter (ASRC) IP
core that delivers real-time and batch-mode sample rate conversion with exceptional signal
integrity, ultra-low
distortion, and unmatched
scalability. The company
believes the new Audio
Sample Rate Converter
(ASRC) IP core offers the
best combination of
capabilities, performance,
and hardware efficiency
available on the market
today.
The new multi-channel
digital audio sample rate
converter core provides
competitive features in
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either FPGA or ASIC implementations, including:
• Scalable Performance, with both synchronous and asynchronous modes, conversion
ratios from 1:24 to 24:1, and the scalable handling of tens to hundreds of audio channels
without hardware replication.
• Studio-Grade Audio Quality, with a Total Harmonic Distortion Plus Noise (THD+N)
averaging -130 dB—and never exceeding -126 dB for conversions between 8kHz and
192kHz—plus prevention of artifacts caused by jitter or drift. more New Audio Sample
Rate Converter (ASRC) IP Core from CAST Offers Versatility with High Fidelity
• Fast Operation, with a short synchronization time of <100ms with a 100Mhz clock,
and a low input-to-output delay, e.g., a latency of just 50µs converting a 44.1kHz
signal to 96kHz.
• Memory-Optimized Filtering, using an innovative linear interpolation method to
calculate filter coefficients (filter taps) on the fly—no massive precomputed lookup table
is needed—to reduce memory requirements, maintain high-quality f iltering, and minimize
implementation size and power.
• Easy Integration, using standard AMBA® bus interfaces or a generic microcontroller
interface—with other interfaces available—plus the reliability, complete deliverables,
and great support that come with all the cores from CAST.
Sourced from partner IObundle (www.iobundle.com), the new ASRC IP core builds on advanced
digital audio research performed at Portugal’s esteemed Instituto Superior Técnico while also
satisfying CAST’s high standards for IP quality, reliability, and reusability.
“With this new core, we have more than met our goal to develop one of the best available ASRCs
while also supporting the widest range of audio sampling situations, with hardware that can meet
the performance, power, and silicon requirements of nearly any audio system project,” said Dr.
Jose T. de Sousa, founder and general manager of IObundle.
The potential applications of the ASRC core are wide-ranging. Its unique dual-mode operation
means it can support asynchronous, real-time rate conversion as well as synchronous conversion
suitable for batch audio processing. Its high fidelity and fast operation benefit professional and
broadcast-level systems, while its reliability and efficiency suit automotive, telecommunications,
mission-critical, and other stringent environments.
The new ASRC IP core is available now for ASICs and FPGAs, with flexible licensing including
royalty-free terms. It joins the existing I2S/TDM Multichannel Audio Transceiver core in CAST’s
growing Audio Interfaces IP family. Visit the ASRC IP Core product page or contact CAST Sales
for more information.
About CAST
Computer Aided Software Technologies, Inc. (CAST) is a silicon IP provider founded in 1993.
The company’s ASIC and FPGA IP product line includes security primitives and comprehensive
SoC security modules; microcontrollers and processors; compression engines for data, images,
and video; interfaces for automotive, aerospace, and other applications; and various common
peripheral devices. Learn more by visiting www.cast-inc.com.
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CAST is a trademark of Computer Aided Software Technologies Inc.
Other trademarks are the property of their respective owners.
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