M-Audio Flying Cow Bedienungsanleitung

Table of Contents

FCC Class B and CE Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

D/A Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

A/D Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Panels - Fig. 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Installation and Typical Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Typical Setup - Fig. 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Selecting Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

D/A Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

A/D Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Appendix A - Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Appendix B - Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

S/PDIF Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

AES/EBU Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Appendix C - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Appendix D - Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Lifetime Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

FCC Class B and CE Compliance

WARNING: This equipment has been tested and found to comply with

the limits for a CLASS B digital device, pursuant to Part 15 of the FCC

Rules. These limits are designed to provide reasonable protection

against harmful interference in a residential installation. This equipment

generates, uses and can radiate radio frequency energy and, if not

installed and used in accordance with the instructions contained in this

manual, may cause harmful interference to radio and television

communications. However, there is no guarantee that interference will

not occur in a particular installation.

If this equipment does cause harmful interference to radio or television

reception, which can be determined by turning the equipment off and

on, the user is encouraged to try to correct the interference by one or

more of the following measures: 1) reorient or relocate the receiving

antenna; 2) increase the separation between the equipment and the

receiver; 3) connect the equipment into an outlet on a circuit different

from that of the receiver; 4) consult the dealer or an experienced audio

television technician.

NOTE: Connecting this device to peripheral devices that do not

comply with CLASS B requirements or using an unshielded

peripheral data cable could also result in harmful interference to

radio or television reception.

The user is cautioned that any changes or modifications not expressly

approved by the party responsible for compliance could void the user’s

authority to operate this equipment.

To ensure that the use of this product does not contribute to

interference, it is necessary to use shielded I/O cables.

This product also complies with European CE requirements.

Overview

Thanks for choosing the Flying Cow, professional external digital

audio converter box. The unit provides high quality, 24-bit A/D

and D/A converters and supports the popular digital audio

formats S/PDIF and AES/EBU. The Flying Cow’s unique design

allows it to fit into half of a standard 19” rack space — two

Flying Cows may be mounted side by side in a single 19” rack

space!

The Flying Cow is a perfect companion for computer digital I/O

cards, or any other digital audio device that requires high-quality

A/D and/or D/A conversion. It can even be used as a

replacement for lower performance DAT or DVD converters.

This manual assumes that you have a basic understanding of

A/D and D/A conversion, and digital audio. If after reading this

manual you need additional technical support or if you have

comments or suggestions, we invite you to contact us directly by

any one of the following methods:

MIDIMAN

45 E. Saint Joseph Street

Arcadia CA 91006-2861

Technical Assistance: (626) 445-8495

Fax: (626) 445-7564

Sales: (626) 445-2842

Internet Tech Support: [email protected]

Internet:

Web Site: http://www.midiman.net

Tech Support: [email protected]

Sales Info: [email protected]

Features

•Pro quality, stereo A/D and D/A converters.

•Simultaneous A/D and D/A conversion.

•Standard single height, half-rack dimensions.

•AES/EBU digital I/O on XLR connectors.

•S/PDIF digital I/O on RCA connectors.

•Balanced analog inputs on either XLR or 1/4”

tip-ring-sleeve connectors.

•Unbalanced analog inputs on 1/4” tip-sleeve connectors.

•Balanced analog outputs on XLR connectors.

•Unbalanced analog outputs on 1/4” connectors.

D/A Converter

•24-bit stereo D/A, delta-sigma converters with

128x oversampling.

•Dynamic range of 104dB (A-weighted).

•THD = 0.001% @ 0dBFS.

•Frequency Response:† 20Hz-22kHz, -0.5,-0.3dB

A/D Converter

•24-bit stereo A/D, delta-sigma converters with

128x oversampling.

•Dynamic range of 102dB (A-weighted).

• THD: 0.0015% @ 0dBFS.

•Frequency Response:† 20Hz-20kHz, -0.5,-0.3dB.

•Sample Rates:† 32, 44.1, 48 kHz and "EXT".

Front Panel

•Analog Input Level knob allows optimum gain setting of

input signal to A/D.

•Dual LED level ladders accurately depict incoming signal

levels to A/D.

•A/D sample rate adjustable from front panel.

•“D/A Valid” LED indicates valid incoming digital data.

•LEDs indicate current digital format and A/D sample rate.

•Unit remembers system setup even after power-off.

Panels - Fig. 1

POWER

D/A

VALID DIGITAL

FORMAT

AES/

EBU S/P

DIF 48 32 EXT

44.1

MODE

SELECT A/D INPUT LEVEL ANALOG

INPUT LEVEL

A/D

SAMPLE RATE L

-40 -20 -10 -6 -3 CLIP

0 MAX

ANALOG OUT L

R ANALOG INAES/EBU

OUT S/PDIF AES/EBU

9VAC

OUT

1. 2. 3. 4. 5. 6. 7.

8. 11. 14.12. 13.9. 10.

FLYING COW

™

AUDIO

124 BIT

Panel Description

Front Panel

1. D/A Valid: This LED indicates valid incoming digital data

for the D/A converter. When in AES/EBU mode, this LED

lights whenever there is a valid digital signal present at the

AES/EBU In jack. When in S/PDIF mode, this LED lights

whenever there is a valid digital signal present at the S/PDIF

In jack.

2. Digital Format: These two LED’s indicate the current digital

interface mode as either AES/EBU (professional) or S/PDIF

(consumer). The mode applies to digital data both entering

and exiting the Flying Cow. The Digital Format is selected

via the Mode Select Button.

3. A/D Sample Rate: These four LED’s indicate the current

sample rate in use by the A/D converter (48kHz, 44.1 kHz, 32

kHz, or EXT). The first three are standard sample rates. EXT

is a special mode in which A/D conversion is synchronized

with the sample rate of some external source. It is often used

to sync with less common and non-standard sample rates.

4. Mode Select: Repeatedly pressing this button will cycle

through all of the available sample rates and digital formats.

When powered up, the Flying Cow will restore the mode and

sample rate that was set before the previous power-down.

5. A/D Input Level LED’s: These LED meters indicate the left

and right analog audio levels entering the A/D converter.

CLIP indicates an overload condition to the A/D channel and

will result in distortion.

6. Analog Input Level: This knob sets the level of the incoming

analog audio signal as it enters the A/D converter. For the

greatest dynamic range (and signal-to-noise ratio), it is best to

set these levels as high as possible without making the CLIP

LED’s light. When turned all the way down (0) attenuation is

full, and when turned all the way up (Max) gain is maximum.

7. Power: When this button is in, power is applied to the unit.

When out, power is off. When power is turned off, the

Digital Format and A/D Sample Rate settings are saved, and

restored upon power up.

Rear Panel

8. Power connector: For connection to the unit’s external “wall-

wart” power supply. The Flying Cow uses an external 8.5 or

9 volt A/C power supply with 1 amp or greater current

capacity.

9. Analog Out (Right and Left): These are the analog audio

outputs from the Flying Cow’s D/A converters. These

unique combination jacks mate with either male XLR-type

connectors or 1/4” phone plugs. The XLR (outer) portions of

the jacks provide balanced outs. The 1/4” (inner) portions

provide unbalanced outs.

10. Analog In (Right and Left): These are the analog audio

inputs to the Flying Cow’s A/D converters. These unique

combination jacks mate with either male XLR-type connectors

or 1/4” phone plugs. The XLR (outer) portions of the jacks

are compatible with balanced inputs. The 1/4” (inner)

portions are compatible with both balanced (tip-ring-sleeve)

and unbalanced (tip-sleeve) inputs.

11. AES/EBU Out: This male XLR jack provides standard

AES/EBU digital output from the Flying Cow’s A/D

converters. The digital audio signal is stereo, containing

both left and right channel data.

12. S/PDIF In: This female RCA jack accepts standard S/PDIF

input to the Flying Cow’s D/A converters. The digital audio

signal is stereo, containing both left and right channel data.

This jack may also be used to accept S/PDIF “Word Clock” to

the Flying Cow when operating with EXT sample rate.

13. S/PDIF Out: This female RCA jack provides standard

S/PDIF digital output from the Flying Cow’s A/D converters.

The digital audio signal is stereo, containing both left and

right channel data.

14. AES/EBU In: This female XLR jack accepts standard

AES/EBU input to the Flying Cow’s D/A converters. The

digital audio signal is stereo, containing both left and right

channel data. This jack may also be used to accept AES/EBU

“Word Clock” to the Flying Cow when operating with EXT

sample rate.

Installation and Typical Setup

Your Flying Cow box should contain this manual, a “wallwart”

power transformer (U.S. customers only) and the Flying Cow

unit itself. Please save all packing materials in case you should

ever need to ship the unit.

The Flying Cow may be operated on any flat surface or it may be

installed in a standard 19” rack equipment tray. For installation

in a 19” rack tray you will first need to remove the four rubber

feet from the unit. Next, left or right justify the Flying Cow in

the rack tray. Lastly, tighten the included rack-mount screw,

through the rack tray hole, into the single threaded hole on the

bottom of the Flying Cow chassis.

Plug in the power supply. With the Flying Cow’s power turned

off, make your connections to any analog or digital cables you

will be using. Next, power up the Flying Cow by pressing the

Power button on the front panel.

IMPORTANT: Before powering up the Flying Cow, turn down

any amplifiers (or mixers) connected to the Flying Cow’s outputs.

Since it takes several milliseconds for the Flying Cow to acquire

and lock onto an incoming digital signal, there may be a slight

“pop” sound while powering up.

Atypical configuration in which a Flying Cow would be used

includes a Flying Cow, a PC based digital I/O card, a mixer and

an amplifier/sound system (see Typical Setup figure). Such a

configuration could be setup as follows: 1.) the unbalanced stereo

audio out of the mixer goes to the 1/4” audio inputs on the

Flying Cow, 2.) the S/PDIF out of the digital audio card goes to

the S/PDIF In on the Flying Cow, 3.) the S/PDIF in of the digital

audio card goes to the S/PDIF Out on the Flying Cow, 4.) the

unbalanced Analog Out on the Flying Cow goes to a line level

audio in on the amplifier/sound system.

Typical Setup - Fig. 2

GAIN

•

00 +20

••

SEND

•

0 +6

••

SEND

•

0 +6

••

SEND

•

0 +6

••

SEND

•

0 +6

••

SEND

•

0 +6

••

SEND

•

0 +6

••

LOW

•

-15 +15

••

MID

•

-15 +15

••

HIGH

IN 1

MIC 1

IN 2

MIC 2

•

-15 +15

••

LOW

•

-15 +15

••

MID

•

-15 +15

••

HIGH

•

-15 +15

••

LOW

•

-15 +15

••

MID

•

-15 +15

••

HIGH

•

-15 +15

••

LOW

•

-15 +15

••

MID

•

-15 +15

••

HIGH

•

-15 +15

••

PAN

•

L R

•

GAIN

•

00 +20

••

PAN

•

L R

•

GAIN

•

00 +20

••

PAN

•

L R

•

GAIN

•

00 +20

••

PAN

•

L R

•

GAIN

•

00 +20

••

BAL

•

L R

•

GAIN

•

00 +20

••

BAL

•

L R

•

5/6 7/8

2 3 4

3 mon

4 mon

5L mon

6R str

7L mon

8R str

9L mon OUT L OUT R

STR RET SEND10R str

TAPE IN

LEFT RIGHT

TAPE OUT

LEFT RIGHT

POWER

STEREO RTN

•

00 Max

••

PHONES

MAIN

•

00 Max

••

CLIP

MI IM TM

10 CHANNEL MIXER

FLYING

COW

SPEAKERS

POWER

AMP

MIXER S/PDIF

Out/In

DIGITAL AUDIO

CARD

(Inside PC)

S/PDIF

In/Out

AUDIO

Out

Operation

The A/D and D/A sections of the Flying Cow operate

simultaneously, even though you may sometimes choose to use

only one or the other at any given time. The A/D and D/A are

both set up from the Flying Cow’s front panel.

Selecting Modes

The Mode Select button is used to select the A/D Sample Rate

and the Digital Audio Format. As the Mode Select button is

repeatedly pressed, the Flying Cow cycles between the four

Sample Rate settings: 48 kHz, 44.1 kHz, 32 kHz, and EXT. After

every four presses of the button the Digital Format will also

change — between AES/EBU and S/PDIF settings. Therefore, it

should never take more than 8 presses of the button to get to

your desired setup.

As they are changed, the Sample Rate and Digital Format settings

are stored inside the Flying Cow. When the Flying Cow is turned

off and then back on, these changed settings will be retained.

D/A Operation

The Flying Cow D/A converter is compatible with 24bit, 20bit,

18bit, and even 16bit digital data — the more bits per data word,

the better the dynamic range of the output signal — and

therefore, the better the audio quality. The D/A converter

receives a continuous digital audio stream from either the

AES/EBU In or S/PDIF In jack, depending on the setting of the

Digital Format on the Flying Cow’s front panel. The digital data

is converted to stereo analog audio, and output through the left

and right Analog Out jacks. The Analog Out jacks can accept

either XLR connections or 1/4” connections. On the XLR audio

out connections, the audio is balanced; on the 1/4” audio out

connections, the audio is unbalanced.

The D/A does not require you to manually select a sample rate.

Instead, it automatically detects the sample rate of the incoming

digital audio data and adjusts it accordingly. If a valid digital

stream is detected, the front panel “D/A Valid” LED will light.

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