Philips UDA1325

1999 May 10 18

Philips Semiconductors Preliminary speciﬁcation

Universal Serial Bus (USB) CODEC UDA1325

Treble control

For the playback channel, treble can be regulated in three audio modes: minimum, flat and maximum mode. In flat mode

the audio is not influenced. In minimum and maximum mode, the treble range is from 0 to 6 dB in steps of 2 dB.

The programmable treble filter is implemented digitally and has a fixed corner frequency of 3000 Hz for the minimum

mode and 1500 Hz for the maximum mode. Because of the exceptional amount of programmable gain, treble should be

used with adequate prior attenuation, using volume control.

Table 11 Treble settings

Bass control

For the playback channel, bass can be regulated in three audio modes: minimum, flat and maximum mode. In flat mode

the audio is not influenced. In minimum mode the bass range is from 0 to approximately 14 dB in steps of 1.5 dB.

In maximum mode, the bass range is from 0 to approximately 24 dB in steps of 2 dB. The programmable bass filters are

implemented digitally and have a fixed corner frequency of 100 Hz for the minimum mode and 75 Hz for the maximum

mode. Because of the exceptional amount of programmable gain, bass should be used with adequate prior attenuation,

using volume control.

TR4 TR3 TR2 TR1 TR0 TREBLE (dB)

FLAT SET MIN. SET MAX. SET

00000000

00001000

00010000

00011000

00100022

00101022

00110022

00111022

01000044

01001044

01010044

01011044

01100066

01101066

01110066

01111066

... ... ... ... ... 0 6 6

11111066