Table of Contents
Advertisement
Advertisement
Table of Contents
Related Manuals for Digital audio adda 2402
Summary of Contents for Digital audio adda 2402
- Page 1 ADDA 2402 User manual...
- Page 2 The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to CAUTION alert the user to the presence of uninsulated RISK OF ELECTRIC SHOCK DO NOT OPEN "dangerous voltage" within the product's ATTENTION enclosure that may be of sufficient magnitude : RISQUE DE CHOCK ELECTRIQUE NE PAS OUVRIR to constitute a risk of electric shock to persons.
- Page 3 Trademarks of Digital Audio Denmark a/s. Product features and specifications are subject to change without notice . Digital Audio Denmark a/s shall not be liable for technical or editorial errors contained herein, nor for incidental or consequential damages resulting from the furnishing, performance or use of this manual.
-
Page 4: Table Of Contents
ONTROLS Analog Input Digital Input Digital Output Source Sample Rate Dither Sync. Power ETER 4. BLOCK DIAGRAM 5. SPECIFICATIONS NALOG DIGITAL CONVERSION IGITAL ANALOG CONVERSION IGITAL DIGITAL CONVERSION ENEREL 6. References 7. Appendix, Distortion Effects from Aliasing in Digital Audio... -
Page 6: Introduction
44,1 kHz 48 kHz, 64 kHz, 88,2 kHz to 96 kHz, and convert between the professional and the consumer AES/EBU format. ADDA 2402 has high precision internal oscillators with a stability of +/- 5 parts per million (PPM) controlling the sample-rates. The ADDA2402 can also be synchronised to an external reference signal complying with AES 11 Please refer to section 5, references for an explanation of AES 3. -
Page 8: Installing The Adda 2402
2402 is labelled on the AC power connector with the main voltage setting which can be either 110-120V, 220-240V or 110-240 V at 50-60 Hz. · Set your ADDA 2402 on a hard and dry surface or mount it onto a 19” rack, and leave plenty of room for ventilation. ·... -
Page 9: Connecting The Analog Audio Cabels
Connecting the analog audio cabels After you have turned down the level on your sound system, you can rig the ADDA 2402’s analog audio cables. You will find two balanced XLR input connectors marked L-Analog in-R. On The right side of the XLR input connectors you will find two Jack input connectors marked L/R for unbalanced input. -
Page 10: Operation
After start-up the ADDA 2402 has to calibrate for about 20 seconds. It is recommended to leave the ADDA 2402 on for approximately 5 minutes in order to warm up, and then activate the sample-rate selection or digital input source switch. This will cause the converter to recalibrate, and improve the dynamic range in a region of 1 to 2 dB. -
Page 11: Sample Rate
By pressing the Power Button in stand-by mode, the converter re-enters the operation mode, with all power restored. If the main switch on the rear panel is switched off there will be no power on the ADDA 2402. The Peak Meter The ADDA 2402 is equipped with a very precise Fast Peak Programme Meter (PPM) for monitoring the level of the analog input signal. -
Page 12: Block Diagram
–60 dBFS, but still the A/D converter will have a dynamic range better than 116 dB (A). With a 12 dB headroom, the noise floor will thus be below 104 dBrel(A) to the nominal level of 6dBu (0dBrel). 3. Block diagram The following figure shows a block diagram of the ADDA 2402. -
Page 14: Specifications
4. Specifications: Analog to Digital Audio Conversion Cross-talk: · Cross-talk at 997 Hz, -3 db Fs < 110 dB Processing delay: · Processing delay < 1,0 ms Frequency response · Fs 32kHz, 18 Hz-13,5 kHz:±0.1dB · Fs 44,1kHz, 18 Hz-18,8 kHz:±0.1dB ·... - Page 15 THD+Noise The THD+N vs. input amplitude is shown in the figure below. At a nominel input level of 6 dBu, the THD+N is below – 104 dB. Digital Audio Denmark a/s A-D: THD vs Amplitude@997 Hz at 48 kHz sampling...
-
Page 16: Digital - To - Analog Conversion
The dynamic range is better than 117 dB (A-weighted) at 44,1 kHz sampling. The dynamic range with a –60 dB FS input signal is better than 140 dB measured as a FFT. D-A Dynamic range Digital Audio Denmark level: -60 dBFS. -100... - Page 17 THD+Noise THD+N output signal is measured relative to a nominal output level of 6 dBu, THD+N is below 90 dBr. Digital Audio Denmark a/s D-A: THD+N vs Amplitude @997 Hz at 48 kHz sampling -100 -105 -110 -115 -120 dBFS Linearity Linearity better than +/- 0,5 dB down-to –105 dB.
-
Page 18: Digital - To - Digital Conversion
Digital to Digital Audio Conversion Cross-talk: · Cross-talk at 997 Hz, 3 dB Fs < 100dB Processing delay: · Processing delay 2,0 ms Frequency response 44,1 to 48 kHz 18 Hz-19,0 kHz 44,1 to 96 kHz 18 Hz-21,0 kHz Digital Audio Denmark... -
Page 20: Generel
3,3 kg Mains Voltage: 110 - 120 VAC or 220 - 240 VAC Power Consumption: 10 Watts Due to our policy of continous improvement of our products, Digital Audio Denmark reserves the right to make feature and specifications changes without notice. -
Page 22: References
DITHER The dither of the ADDA 2402 is implemented by using a psychoacoustic noise shaping filter for truncating the 24 bit audio word to 16, 18 or 20 bits, while the 24 bit sound quality is preserved. A detailed description of the dither algorithm can be found in the AES paper: “Psychoacoustically Optimal Noise Shaping”... - Page 23 ABSTRACT When converting audio between the analog and digital audio domains, the well-known effects from alias signals have to be taken into consideration. Generally, audio converters do not have adequate filtering to eliminate this kind of spectral distortion. During recent works it has been concluded that the sound quality of digital recordings can be drastically improved when applying efficient stop-band filtering.
-
Page 24: Appendix, Distortion Effects From Aliasing In Digital Audio
INTERMODULATION DISTORTION Nyquist Frequency Intermodulation distortion is a type of distortion 44.1 kHz sample rate where non-linearities in the signal path generate modulation between all the frequency components of the signal. The primary source for IM distortion in the audio signal path is the loudspeaker. This is due to the non-linear behaviour of the speaker cone, which of course depends on the loudspeaker type and quality. - Page 25 44.1/ 48 kHz even with a NF stop-band filter applied. The ADDA 2402 A/D, D/A and D/D converter from However the primary issue when considering the Digital Audio Denmark has implemented NF stop-band different sample-rates for high quality sampling is to filtering for eliminating the risk of AID.