WEISS GAMBIT SFC2 Manuel utilisateur

digital audio

weiss engineering ltd.

Florastrasse 42, 8610 Uster, Switzerland

)+41 1 940 20 06 2+41 1 940 22 14

8http://www.weiss.ch / http://www.weiss-highend.com

GAMBIT

SFC2

OPERATING MANUAL

Software Version: 0S: 1.0

OPERATING INSTRUCTIONS FOR GAMBIT SFC2 CONTENTS

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 2of 8

)+41 1 940 20 06 2+41 1 940 22 14 8http://www.weiss.ch

CONTENTS

CONTENTS ___________________________________________________________________2

FRONT PANEL ________________________________________________________________3

INTRODUCTION ______________________________________________________________4

Features_____________________________________________________________________________4

OPERATION __________________________________________________________________5

Connections__________________________________________________________________________5

Changing Output Sampling Frequency _____________________________________________________5

Dither_______________________________________________________________________________5

TECHNICAL DATA ____________________________________________________________6

AES/EBU Input A & B __________________________________________________________________6

AES/EBU Output A & B_________________________________________________________________6

Power_______________________________________________________________________________6

Dither_______________________________________________________________________________7

Conversion Spectra ____________________________________________________________________8

OPERATING INSTRUCTIONS FOR GAMBIT SFC2 FRONT PANEL

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 3of 8

)+41 1 940 20 06 2+41 1 940 22 14 8http://www.weiss.ch

FRONT PANEL

•

Graph 1: Front Panel Elements

The front panel of the SFC2 offers several control and display features. These can be grouped according to Graph 1:

Œ-Control Elements for Channel A

•-Control Elements for Channel B

Ž- Mains power switch

This manual will explain how to operate the SFC2 according to these groups

OPERATING INSTRUCTIONS FOR GAMBIT SFC2 INTRODUCTION

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 4of 8

)+41 1 940 20 06 2+41 1 940 22 14 8http://www.weiss.ch

INTRODUCTION

Congratulations on purchasing the Weiss Gambit Series SFC2 !

The main function of the SFC2 will be inte-

grating playback or outboard equipment into

an environment that either runs at double- or

standard-sampling frequency. To allow this

equipment to be positioned anywhere in the

processing chain, the SFC2 features two com-

pletely independent two-channel sampling fre-

quency converters, A & B, to simultaneously

down- and up-sample a signal. Alternatively, it

can also be used to convert the sample fre-

quency and reduce the wordlength of any two

arbitrary audio signals at the same time.

Standard sampling frequency converter chips

continuously measure the input frequency and

then generate the output frequency and the

filter specifications accordingly. This results in

coefficient "jitter" because the input signal

sampling frequency jitter modulates the cutoff

frequency of the digital filter. However, the

SFC2 uses a fixed-ratio scheme where the

output is directly derived from the input sam-

pling frequency - therefore no coefficient "jit-

ter", no filter modulation, more transparency.

Features

Auto detection and display of input sam-

pling frequency

Selection of output sampling frequency

with large, backlit push buttons

Supported input and output sampling fre-

quenncies:

44.1 / 48 / 88.2 / 96 kHz

Bit transparent for 1:1 conversions

24bit I/O on single wire AES/EBU inter-

faces

Noiseshaped dither for wordlength reduc-

tion of output signal to 16 or 20bit

Selectable autoblacking for dither – mutes

dither if no signal present.

40bit floating point digital signal processing

OPERATING INSTRUCTIONS FOR GAMBIT SFC2 OPERATION

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 5of 8

)+41 1 940 20 06 2+41 1 940 22 14 8http://www.weiss.ch

OPERATION

Connections

Connect the AES/EBU signal to the input and

output plugs at the rear of the SFC2.

The sampling frequency of the connected signal

will either display in Œ(channel A) or in •

(channel B), according to which channel was cho-

sen.

Two stereo signals can be connected simultane-

ously to the the two channels A and B – they

need not be in sync.

Changing Output Sampling Fre-

quency

If none of the push buttons are pressed (none of

the buttons is lit), the SFC is in input signal follow

mode: the output will always be at the same

sampling frequency as the input. If no dither is

selected, then the output will be bit equal to the

input in this mode.

To choose another output sampling frequency,

simply press the appropriate button – it will be lit

so that the status of the SFC can be confirmed

visually.

Dither

The SFC2 is able to apply shaped dither noise to

remove distortion when re-quantizing from 24bit

to 16bit or 20bit output word length (see

TECHNICAL DATA for dither specifications).

To toggle dither on/off, press the button marked

“dither” in the “dither output settings” field. The

button is lit when dither is active.

Word Length and Autoblacking

Pressing the “mode” button int the “dither out-

put settings” field will toggle through the follow-

ing modes:

-16bit without autoblacking

-20bit without autoblacking

-16bit with autoblacking

-20bit with autoblacking

The selected mode is displayed above the

“mode” button.

If auto-blacking is activated, dither will be turned

off if the input signal is digital zero for more than

256 consecutive samples. As soon as the input

signal changes, dither will be turned on again.

This ensures that breaks between programs are

still at digital zero, regardless of dither.

OPERATING INSTRUCTIONS FOR GAMBIT SFC2 TECHNICAL DATA

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 6of 8

)+41 1 940 20 06 2+41 1 940 22 14 8http://www.weiss.ch

TECHNICAL DATA

AES/EBU Input A & B

Sampling Frequencies: 44.1 kHz, 48.0 kHz, 88.2 kHz, 96kHz

Maximum Input Wordlength: 24 Bits

Channel Status Data: Input accepts professional or consumer format.

Channel Status Bits

forwarded to AES/EBU output: all

Connector: XLR female

AES/EBU Output A & B

Sampling Frequencies: 44.1 kHz, 48.0 kHz, 88.2 kHz, 96kHz

Output Wordlength: 24 Bits

Connector: XLR male

Power

Mains Voltage: 110 / 220 Volts with voltage selector

Fuse rating: 500 mA slow blow

Power Consumption: 40VA max

OPERATING INSTRUCTIONS FOR GAMBIT SFC2 TECHNICAL DATA

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 7of 8

)+41 1 940 20 06 2+41 1 940 22 14 8http://www.weiss.ch

Dither

If no dither is applied to the digital signal when recording to 16bit or 20bit media (e.g. DAT, CD-R etc), the signal will

be truncated, which leads to quantization noise. Graphic 2shows a 24bit sine wave at –85dBFS truncated to 16bit.

Graphic 2: Sine wave truncated

Graphic 3shows the same sine wave, but dithered to 16bit. This eliminates quantization distortion.

Graphic 3: Sine wave dithered

OPERATING INSTRUCTIONS FOR GAMBIT SFC2 TECHNICAL DATA

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 8of 8

)+41 1 940 20 06 2+41 1 940 22 14 8http://www.weiss.ch

CONVERSION SPECTRA

1kHz Sine 0dB Converted From 96kHz to 44.1kHz

-180

-160

-140

-120

-100

-80

-60

-40

-20

05383 10767 16150 21533

Frequency [Hz]

Amplitude [dBFS]

1kHz Sine 0dB Converted From 44.1kHz to 96kHz

-180

-160

-140

-120

-100

-80

-60

-40

-20

011719 23438 35156 46875

Frequency [Hz]

Amplitude [dBFS]

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