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Cmedia Audio-Visual Tech Q&A | Symmetry Blog

Ray Pan in Blogs on February 24, 2021

About Ray Pan

Ray Pan is an Applications Engineer at Symmetry Electronics. He has a Bachelor’s in Electrical Engineering from San Jose State University. With over 15 years of hands-on experience in the electronics industry, Ray serves as an excellent technical consulting resource for design engineers. Specializing in consumer and professional audio-video, FPGA, and mmWave applications–Ray develops insightful technical articles, conducts technical trainings for inside sales and customers, provides system architecture analyses, and interprets market trends covering technical products. Recognized for his talents and contributions, Ray is the proud recipient of the Lattice Semiconductor FAE of the Year 2020 Award for America.


1. Does Cmedia USB audio codec require vendor drivers for a designated operating system?

Cmedia USB audio codecs are classified as UAC 1.0, USB 2.0 Full Speed or UAC 2.0, or USB 2.0 High Speed. The UAC 1.0 has long been supported by built-in drivers for Windows, Linux, MacOS and iOS with known cross-platform compatibility. With the latest updates to Windows 10, UAC 2.0 built-in drivers are now found in Linux, MacOS and iOS, and Windows 10.

2. How do you choose between UAC 1.0 and 2.0 devices from Cmedia?

It depends on the required sample rate of your audio stream. UAC 1.0 devices are capable of supporting up to 24-bit@96KHz and UAC 2.0 aims for high bitrate audio up to 32-bit@768KHz in PCM and 22.4MHz in DSD format.

3. Does Cmedia USB codec require firmware development?

It depends on your device and application requirement. Most USB codecs can operate as plug and play without any firmware development. Source code is available upon request from Cmedia for custom firmware development.  

4. Is it possible to customize the Cmedia USB codec design without developing firmware?

Yes, Cmedia offers a PC GUI configuration tool that can be accessed upon request. This tool allows you to customize the USB descriptor (VID/PID), product and manufacturer strings, and audio performance (gain, filtering, EQ, mixer). It also provides a firmware binary base for customization.

5. Does the Cmedia USB Audio Codec depend on USB VBUS power for normal operation, or does it require an external power supply?

Cmedia USB audio codec can operate solely on USB VBUS power; however, an external power supply may be used based on application requirements.

6. Do I need to acquire VID/PID from USB.ORG for my USB audio product?

The VID/PID is the unique identifier to distinguish USB devices and are used by operating systems to locate designated drivers for the USB device. Cmedia allows developers to adopt Cmedia VID along with chip specified PID to be used in their products.  


Browse Cmedia products available at Symmetry Electronics.

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Ray Pan in Blogs on February 24, 2021

About Ray Pan

Ray Pan is an Applications Engineer at Symmetry Electronics. He has a Bachelor’s in Electrical Engineering from San Jose State University. With over 15 years of hands-on experience in the electronics industry, Ray serves as an excellent technical consulting resource for design engineers. Specializing in consumer and professional audio-video, FPGA, and mmWave applications–Ray develops insightful technical articles, conducts technical trainings for inside sales and customers, provides system architecture analyses, and interprets market trends covering technical products. Recognized for his talents and contributions, Ray is the proud recipient of the Lattice Semiconductor FAE of the Year 2020 Award for America.

Why partner with Symmetry Electronics? Symmetry's technical staff is specially trained by our suppliers to provide a comprehensive level of technical support. Our in-house Applications Engineers provide free design services to help customers early in the design cycle, providing solutions to save them time, money and frustration. Contact Symmetry for more information.

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