BU26154MUV_15 Datasheet, PDF (24/90 Pages) Rohm – Monaural Audio CODEC with Touch Panel Interface

BU26154MUV
Signal Flow
It uses signal flow Case1 or Case2 at the time of recording (analog microphone).
Case1:
Recording
AMIC
VOL
ADC
HPF1
HPF2
ALC
Filter
REC
LPF
Filter Block
REC
ALCVOL
Noise
Gate
DV
MUTE
REC
DATT
Digital
Interface
Datasheet
Case2:
Recording
AMIC
VOL
ADC
HPF1
HPF2
ALC
Filter
REC
LPF
Filter Block
REC
ALCVOL
Figure 27
Noise
Gate
DV
MUTE
REC
DATT
Digital
Interface
Name
AMICVOL
HPF1
HPF2
Filter
RECLPF
REC
ALCVOL
ALC
Noise Gate
RECDATT
Function
Analog Microphone volume
High path filter for record DC cut
High pass Filter for Record
Notch filter is available
Low pass Filter for recording.
ALC use:ALC controls volume
ALC not use: It’s available as
Boost volume
Auto Level Controller Function.
ALC is processed to recording
data
The purpose is for reducing a floor
noise
Record Digital Attenuator.
It’s available fader function for
reducing a Pop-noise when
changing volume.
Related Register
Mic input volume control
DSP Filter Function Enable
DSP Filter Function Enable
High Pass Filter2 Cut-off Control
Sound Effect Mode
DSP Filter Function Enable
EQ Band N Gain Setting
Programmable EQ Band N
Coeffeicient-a0/1
Rec Programmable LPF Setting
Rec Programmable LPF Cutoff
Coef
refer to application note
Record Digital Attenuator Control
Digital Volume Control Function
Enable
Mixer & Volume Control
Setting
Volume setting
9dB to +35.25dB
HPF Enable/Disable
HPF Enable/Disable
order setting
Cut-off frequency setting
Sound Effect mode setting
Each filters Enable/Disable setting
Each filters gain setting
Each sound effects characteristics
setting
LPF Enable/Disable setting
order setting
Cut-off frequency setting
Record Digital Attenuator Control
Digital Volume Control Function
Enable
Mixer & Volume Control
DVMUTE Record Digital Volume Mute
Digital Volume Control Function Digital Volume Control Function
Enable
Enable
* Please refer to the Sound Effect Mode register for Filter Block. When Filter Block is connected with the reproduction route, nothing is processed in the
recording route.
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