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NVP6124

Data sheet

02.11.2015 (REV 0.2)

27/125

4-CH AHD2.0 RX and 9-CH Audio Codec

3. Audio Codec

3.1. Description

NVP6124 outputs PCM digital audio signals converted from analog audio input signals and

analog audio signals converted from PCM digital audio signals. NVP6124 has 9 channels ADC

and 1 channel DAC for audio signal.

Audio data convert to G.711 PCM and Linear PCM data, and these converted data is outputted

via DSP/SSP/I2S interfaces. The output data will be saved at hard disk or any other storages.

This process - to convert and save audio data into storage - is usually called as "Record Output".

The saved audio data is inputted to NVP6124 via DSP/SSP/I2S interfaces. The input audio data

is outputted via audio DAC. This process is named as "Playback Output".

NVP6124 selects one audio input signal among 9 analog audio input(8-Ch Audio/1-Ch mic) and

this audio is outputted through audio ADC and audio DAC. And it also supports directly mixed

audio output signal which 9 analog audio inputs are mixed. This function usually is called by

"Live Output".

In addition, NVP6124 supports audio mute detection and cascade function up to 2 chips - 18

audio channels(16-Ch Audio/2-Ch mic)

3.2. Record Output

Analog audio data is converted to PCM data and this data is outputted to the other NVP6124 or

other IC via DSP/SSP/I2S interfaces. Record output is useful function to save compressed audio

data into storage. Analog audio signal is finally outputted to ADATA_REC pin used for data of

each channel and ADATA_SP pin used for one mixed signal of each channel's data. The output

data from ADATA_SP pin is either same data of ADATA_REC pin or mixed signal of each

channel's data.

PCM data is categorized based on sampling frequency, sampling data bit width and PCM

method. G.711 (A-law/Mu-law), unsigned linear PCM and linear PCM are supported. 8KHz /

16KHz and 8bit/16bit are used for sampling frequency and sampling data bit width, respectively.

Refer the following table when you set the register value.

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