M-Audio Midiman Flying Calf D/A Manual de usuario

Table of Contents

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

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

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

Panels - Fig. 1....................................................................................... 4

Panel Description................................................................................ 5

Front Panel ................................................................................... 5

Rear Panel ..................................................................................... 5

Installation and Typical Setup ......................................................... 6

Typical Setup - Fig. 2 ......................................................................... 7

Operation ............................................................................................ 8

Internal Jumper Settings - Fig. 3 ...................................................... 9

Troubleshooting ............................................................................... 10

Specifications .................................................................................... 11

Lifetime Limited Warranty.............................................................. 12

Flying Calf D/A

™ MANUAL

Version DA 041100

FCC Class B and CE Compliance

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

its for a CLASS B digital device, pursuant to Part 15 of the FCC Rules. These lim-

its 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 instruc-

tions contained in this manual, may cause harmful interference to radio and tele-

vision 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 recep-

tion, 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 experi-

enced audio television technician.

NOTE: Connecting this device to peripheral devices that do not com-

ply with CLASS B requirements or using an unshielded peripheral

data cable could also result in harmful interference to radio or televi-

sion 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 oper-

ate 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

Thank you for choosing the Flying Calf Professional External

Digital Audio Converter Box. This unit provides high-quality

Digital-to-Analog (D/A) conversion and supports the popular

S/PDIF digital audio format.

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

cards (such as the Midiman DiO), DAT machines, or any other

digital audio device that requires high-quality D/A conversion.

This manual assumes you have a basic understanding of D/A

conversion and digital audio. If after reading this manual you

need additional tech support or if you have comments or sugges-

tions, we invite you to contact us directly by any one of the fol-

lowing methods:

MIDIMAN

45 E. Saint Joseph Street

Arcadia CA 91006-2861

Technical Assistance: (626) 445-8495

Fax: (626) 445-7564

Internet Tech Support: [email protected]

Internet:

Home Page: http://www.midiman.net

Tech Support: [email protected]

Sales Info: [email protected]

Refer to the back cover of this manual for addresses and tele-

phone numbers of our overseas office.

Features

• High-quality stereo D/A converter.

• Compact desk-top size: 5.2” x 3.2” x 1.2”.

• S/PDIF digital input on an RCA connector.

• Unbalanced analog outputs on independent left and right

1/4” jacks.

D/A Converter

• 20-bit, stereo D/A, delta-sigma with 128x oversampling.

• Dynamic range of 102 dB (A-weighted).

• Sample rate automatically locks to digital audio signal

received at S/PDIF input.

Front Panel

• “Data Valid” LED indicates valid incoming digital data.

Panels - Fig. 1

S/PDIF IN

ANALOG OUT RL

▲

9VDC

DATA VALID POWER

FLYING CALF D/A

S/PDIF D/A CONVERTER BOX

™

1. 2. 3.

5.4. 6.

Panel Description

Front Panel

1. Data Valid: This LED indicates valid incoming digital data at

the S/PDIF Input. This LED lights whenever the Flying Calf

has acquired and locked to that data.

2. Power LED: The Power LED lights whenever the power is

properly applied to the Flying Calf. For the Power LED to

light the power adapter must be properly plugged in and the

Power button must be depressed.

3. Power switch: When this button is in (and the power adapter

is properly plugged in), power is applied to the unit.

Rear Panel

4. Power connector: For connection to the Calf’s external “wall-

wart” power supply. The Flying Calf uses a 9 Volt DC, 300

milliamp (or larger), center-pin positive supply.

5. Analog Out (Right and Left): These are the analog audio out-

puts from the Flying Calf’s D/A converter. These 1/4" jacks

provide unbalanced line-level signals. Each jack provides a

"tip/sleeve" type of connection.

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

digital audio input. The S/PDIF signal is "stereo," containing

both left channel and right channel audio data. The S/PDIF

data rate also determines the audio sample rate. The Flying

Calf will lock to S/PDIF sample rates of 50 kHz and below.

Installation and Typical Setup

Your Flying Calf should contain this user manual, a "wall-wart"

power adapter and the Flying Calf unit itself. Please save all

packing materials in case you should ever need to ship the unit.

Plug one end of the provided power adapter into the Flying Calf's

power jack, and the other end into a wall socket or power strip.

Verify that the Flying Calf and any other devices you plan to con-

nect to the Flying Calf are powered off. Now connect your

S/PDIF and analog audio cables to the Flying Calf.

NOTE: For best results, use a good-quality S/PDIF cable. The

cable should be coaxial with 75 ohm impedance. For example, a

good quality video cable has these same characteristics.

After all connections are made, power up the Flying Calf by

pressing the Power button on its front panel.

IMPORTANT: Before powering up the Flying Calf, turn off or

turn down any amplifiers (or mixers) connected to the Flying

Calf's audio outputs. Since it may take several milliseconds to

acquire and lock onto an S/PDIF signal, the Flying Calf may

emit a slight "pop" sound while powering up.

A typical configuration in which a Flying Calf would be used

includes a “Calf”, a PC-based digital I/O card, a mixer and an

amplifier/sound system. Such a configuration could be setup as

follows: 1.) the S/PDIF Out of the digital audio card connects to

the S/PDIF In of the Calf, 2.) the Analog Out of the Calf connects

to the line-level audio inputs of the mixer or amplifier/sound sys-

tem.

Typical Setup - Fig. 2

FLYING

Calf D/A

SPEAKERS

POWER

AMP

S/PDIF

Out

DIGITAL AUDIO

CARD

(Inside PC)

S/PDIF

Audio Out

Right

Audio Out

Left

Operation

The Flying Calf is compatible with 20-bit, 18-bit and even 16-bit

S/PDIF data. The more bits per data word, the better the dynam-

ic range of the output signal and better dynamic range equates to

better audio quality.

When a valid signal is present at the Flying Calf's S/PDIF In jack,

the Calf automatically detects the S/PDIF sample rate and syn-

chronizes to it. Once locked to the sample rate, the front panel

"Data Valid" LED will light.

REMEMBER: The Flying Calf accepts any sample rate that is 50

kHz or less.

The Flying Calf then decodes the S/PDIF data to a format recog-

nized by the Calf's D/A converter. The D/A converter then out-

puts stereo analog audio to the internal output amplifiers. The

left channel output amplifier drives unbalanced audio to Left

Analog Out jack, and the right channel output amplifier drives

unbalanced audio to Right Analog Out jack.

The analog outputs of the Flying Calf provide line-level audio sig-

nals typical of most consumer audio components. The output

level is adjustable, however, and may be set for less gain (6 dB

less) by moving two internal jumpers within the Flying Calf. To

do this, 1.) remove power from the Flying Calf and disconnect all

external cables, 2.) carefully remove the Flying Calf chassis cover

by removing the 4 screws from the sides of the chassis, 3.) locate

jumpers JP1 and JP2 on the Flying Calf's circuit board, 4.) posi-

tion JP1 and JP2 as shown in the diagram below, 5.) replace the

Flying Calf chassis cover and screws.

Internal Jumper Settings - Fig. 3

JP1 JP2

for 2 V rms (standard)

JP1 JP2

for 1 V rms (-6 dB option)

Jumpers JP1 & JP2

▲▲

Troubleshooting

Symptom: When power is applied, there are no LED's lit on the

Flying Calf's front panel.

Solution: Make sure the power supply is properly plugged

into the unit and into a live wall source or power

strip. Also, make sure the Calf's Power button is

pushed in and latched.

Symptom: When first turning the unit on, small bursts of noise

or a "pop" sound are sometimes heard.

Symptom: When the S/PDIF source sample rates change, small

bursts of noise or a "pop" sound are sometimes

heard.

Solution: This is normal as it takes a small amount of time for

an S/PDIF receiver to lock onto a digital audio

source. Be sure to turn down your mixer or amplifi-

er before powering up the Flying Calf or changing

sample rates.

Symptom: When applying a digital signal to the Flying Calf, the

Calf's "Data Valid" LED light is erratic or doesn’t

light at all.

Solution: The S/PDIF digital signal may be invalid or the

S/PDIF cable may be faulty.

Symptom: Valid digital data is coming into the S/PDIF input

(the Data Valid LED is lit), but there is no audible

D/A output.

Solution 1: Check your analog output connections from the

Flying Calf.

Solution 2: The digital data source may be sending valid data,

but the data could be static (non-changing or DC).

Verify that digital source material is actually valid.

Solution 3: The digital data source may be sending valid data,

but the data could represent an audio signal that is

so quiet that you are unable to hear it. In this case,

nothing is wrong.

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