User manual M-AUDIO AD-20B

[. . . ] 1 Version AD20 080699 24-Bit Flying Calf A/D TM MANUAL Table of Contents FCC Class B and CE Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The S/PDIF data rate will be determined by the Sample Rate selector button on the front of the Flying Calf. Panels - Fig. 1 FL YING CALF A/D TM 224 B I T S / P D I F A / D C O N V E R T E R 0 48 44. 1 R - 60 - 20 - 10 -6 -3 CLIP l INPUT LEVEL AUDIO L SAMPLE RATE POWER TM 1. 2. 3. 4. 9 VDC L ANALOG IN R S/PDIF OUT 5. 6. 7. Installation and Typical Setup Your Flying Calf box should contain this user manual, a power adapter and the Flying Calf unit itself. Remove the Flying Calf and power adapter from the box and plug one end of the power adapter into the Flying Calf's power jack. With the Flying Calf's power button in the "out" position (power off), plug the other end of the power adapter into a wall socket or power strip. Verify that the Flying Calf and any other devices you plan to connect to it, 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 dubbing cable has these characteristics. 5 Typical Setup - Fig. 2 In 4 In 3 In 2 In 1 Line Out Left Right Mixer S/PDIF In DIGITAL AUDIO CARD (Inside PC) S/PDIF Out Analog In Right Analog In Left FL YING Calf A/D 6 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, mixers, or audio converters connected to the Flying Calf's S/PDIF output. Since it may take several milliseconds for the Flying Calf to output valid S/PDIF, you may hear a slight "pop" or "buzz" sound while powering up if you are monitoring the S/PDIF out . 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 stereo line-level audio outs of the mixer goes into the analog ins of the Calf, 2. ) the S/PDIF out of the Calf goes to the S/PDIF in of the digital audio card, 3. ) another audio out of the mixer may go to an amplifier/sound system or alternately to an audio out of the audio card can go to an amplifier/sound system. Operation The Flying Calf A/D converter accepts analog audio from the left and right Analog In jacks. These 1/4" audio input jacks expect unbalanced (tip-sleeve) signals. The analog signals pass through some analog buffers to the A/D converter, where the audio is digitized at the current sample rate. The A/D converter then drives the Input Level displays and sends the digitized audio data to the S/PDIF transmitter. The transmitter formats and outputs the actual S/PDIF data stream through a transformer to the S/PDIF Out jack. The A/D converter always digitizes the analog data at the sample rate that is set from the front panel of the Flying Calf. When the Sample Rate select button is in the "out" position, the sample rate is 44. 1 kHz. If the button is in the "in" position, the sample rate is 48 kHz. The current sample rate is always indicated by the front panel Sample Rate LED's. 7 The level of the analog signal that goes into the Flying Calf should be adjusted for optimum A/D sampling quality. [. . . ] Symptom: The front panel Input Level CLIP LED is always lit (or frequently lit). Solution 1: Check your source signal levels and analog input cables. Solution 2: The input signal is too strong. Reduce the volume of the source and adjust it so that the clipping level indicators rarely or never light. [. . . ]