Tascam DA-78HR User Manual download pdf (Page 44)

7 - Advanced operations

TASCAM DA-78HR

(for instance 16, the DA-78HR’s non-HR tape word

length) to improve quantization.

Paradoxically, this technique of adding noise

removes quantization noise and distortion at low sig-

nal levels and improves the overall distortion fig-

ures.

Though quantization noise is reduced, there is a loss

of a few dB in the signal-to-noise ratio. For this rea-

son, the DA-78HR does not implement dither as a

standard, but allows you to choose between no dither,

rectangular or triangular (the shapes refer to the dis-

tribution of values in the digital noise). Rectangular

gives about 3dB better signal-to-noise ratio than tri-

angular, but there is noise modulation, which may be

audible when recording and playi ng back low-level

program sources.

NOTE

Dither can be turned on and off while recording is

taking place. However, there will probably be an audi-

ble change in the sound quality. We suggest making

a test recording before a session. In this way you will

be able to make an instant assessment of the effects

of the different dither settings on your program mate-

rial.

7.11.1 Selecting dither settings

Press the

SHIFT

key so that the

SHIFT

indicator

is flashing, and then press the

key until

the display shows

Audio. 1-- (

AUDIO1--

Press the

SUB MENU

key until the display

shows

DITH. ;;; (

DITH xxx

where

xxx

is the

current setting).

Use the ▲ and ▼ to select the dither function

you want (either

OFF

(

OFF

RECT

(

RECT

)

(rectangular) or

TRI

(

TRI

) (triangular)).

7.12Advanced output options

7.12.1 Output word length

The output word length from the

TDIF-1

(and the

SPDIF (

COAXIAL

)) outputs can be set to either 16 or

24 bits.

Press the

SH IFT

key so that the unit is in shift

mode (

SHIFT

indicator is flashing).

Press the

key until the display shows

Audio. 2-- (

AUDIO2--

Press the

SUB MENU

key until the display

briefly shows

Out. bit. ;; (

OUT BIT xx)

where xx is the current setting.

Use the ▲ and ▼ keys to change between 16

and 24 bits.

NOTE

Simply changing the output word length to 24 bits will

not automatically provide better sound quality, if the

equipment being fed by the DA-78HR is not capable

of accepting 24-bit audio.

7.12.2 Output patchbay

In addition to the integral input patchbay, the DA-

78HR also features a patchbay which allows tracks to

be routed to different output channels.

This routing is carried out in parallel to both the

TDIF digital and the analog sets of outputs.

The default setting is

NORMAL (

NORMAL

), i.e.

tracks are output to their correspondingly-numbered

output channels.

To make an output patch setting:

Press the

SH IFT

key so that the unit is in shift

mode (

SHIFT

indicator is flashing).

Press the

key until the display shows

Audio. 2-- (

AUDIO2--

Press the

SUB MENU

key until the display

briefly shows

Out. Patch (

OUT PATCH

), fol-

lowed by the current setting.

Press any of the

REC FUNCTION

keys to select

an output channel (not a track) which will have

a track assigned to it.

The display shows the current setting of this

output channel, e.g.

Ch. 1 Tr. 3 (

Ch1 tr3

)

means that output channel 1 is fed by tape

track 3. Use the ▲ and ▼ keys to change the

track number.

1. A full discussion of dither and other digital

audio techniques is outside the scope of this

manual. However, a good starting point for

learning about this, and other aspects of digital

audio, is John Watkinson’s

The Art of Digital

Audio

, pub Focal Press.

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