CXD2508AQ

更新时间： 2024-01-22 08:36:10

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CXD2508AQ 数据手册

CXD2508AQ/AR

4-4. Description of Functions

No-Sound Data Detection

The no-sound data detection function detects low-level data on both the left and right channels in audio data

from the 1Fs 48-bit slot and outputs a zero detection signal when that data continues unchanged for a certain

period of time.

The audio data is in two's complement format and data in which the upper 12 bits are all "0" or all "1" is

regarded as low level data. When this data continues unchanged for 32,768 samples (743ms when Fs =

44.1kHz), the zero detection signal is output. In other words, once a certain period of time during which low-

level data is detected elapses, the signal is regarded to be in the no-sound state.

The zero detection signal is output from ZEROL (left channel) and ZEROR (right channel) pins. The zero

detection output timing is shown in Fig. 4-5.

Lch

Rch

LRCK

32,768th sample of 32,768th sample of

low-level data low-level data

ZEROR and ZEROL

Lch

Rch

Lch

Rch

Lch

Rch

Lch

Rch

Lch

LRCK

Low-level data Low-level data Sound data Sound data Low-level data Low-level data Low-level data Low-level data Low-level data

ZEROL

ZEROR

Fig. 4-5. Zero Detection Output Timing

– 45 –

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