| Audio Codec Comparison Table |
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| C-Media (CMI) |
C-Media used to be very popular especially on low-end motherboards and they manufactured both codecs and complete audio controllers. Audio controllers usually need an external codec to do the analog-to-digital and digital-to-analog conversions, but C-Media’s low-end audio controllers have a codec embedded inside the chip and that is why we will include them on the table below. Because of that we included a column called “type” to let you known if the chip is just a codec requiring an external controller (e.g. connected the south bridge chip) or if it is a complete controller with an embedded codec (usually connected to the PCI bus). Chips from C-Media use names starting with the letters “CMI”, as you can see on the example shown on Figure 3. 
click to enlarge
Figure 3: C-Media CMI9739A codec.
Model | Type | Channels | Input Resolution | Output Resolution | Input Max. Sampling Rate | Output Max. Sampling Rate | Input SNR | Output SNR | CMI8738/PCI-6CH | Controller | 5.1 | 16-bit | 16-bit | 48 KHz | 48 KHz | 80 dB | 80 dB | CMI8738/PCI-SX | Controller | 4 | 16-bit | 16-bit | 48 KHz | 48 KHz | 80 dB | 80 dB | CMI8768 | Controller | 7.1 | 16-bit | 24-bit | 48 KHz | 96 KHz | 86 dB | 101 dB | CMI9738 | Codec | 4 | 20-bit | 20-bit | 48 KHz | 48 KHz | 72 dB | 82 dB | CMI9739 | Codec | 5.1 | 20-bit | 20-bit | 48 KHz | 48 KHz | | | CMI9761 | Codec | 5.1 | 20-bit | 24-bit | 48 KHz | 96 KHz | 90 dB | 92 dB |
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