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Albalá Ingenieros | Manual

DAT3000C01

6. REGULATIONS

AES11

(2009)

AES recommended practice for digital audio engineering - Synchronization of digital
audio equipment in studio operations.

AES3

(2003)

AES Recommended practice for digital audio engineering - Serial transmission format
for two-channel linearly represented digital audio data.

See also: EBU Tech. 3250-E, ITU-R BS.647-2

AES3id

(1995)

AES information document for digital audio engineering - Transmission of AES3
formatted data by unbalanced coaxial cable.

EBU Tech. 3250-E

(1992)

Specificacion of the digital audio interface.

See also: AES3, ITU-R BS.647-2

ITU-R BT.470-6

(1998)

Conventional analogue television systems.

See also: ITU-R BT.1700, SMPTE 170M

Содержание DAT3000C01

Страница 1: ...DAT3000C01 DUAL AES EBU DIGITAL AUDIO SAMPLING RATE CONVERTER DELAY LINE Version 1 0 Albalá Ingenieros S A Medea 4 28037 Madrid Spain 21 December 2016 Albalá Ingenieros S A All rights reserved ...

Страница 2: ...DAT3000C01 ...

Страница 3: ... 5 5 Termination of the digital audio inputs 14 3 5 6 Selection of automatic mode or manual mode for the reference input 14 3 5 7 Selection of the sampling frequency 15 3 6 Installing the module in the mounting frame 15 3 7 Interconnection 17 3 7 1 Digital audio connections 17 3 7 2 Connections for analog video word clock and the delay signal 18 4 OPERATION 19 4 1 Front panel description 19 4 2 Fu...

Страница 4: ...n of the variable speed varispeed operating mode 27 4 2 8 2 Operation in Automatic Mode 27 4 2 8 3 Operation in Manual Mode 28 4 3 Module remote control and supervision 29 4 3 1 Details of the DAT3000C01 registers 30 5 GLOSSARY 33 6 REGULATIONS 35 7 VERSIONS 37 ...

Страница 5: ... frequency can be set to any of the following standard values 32 44 1 48 64 88 2 or 96 kHz If a frequency other than those listed is required the DAT3000C01 can be operated in varispeed mode A quartz crystal oscillator together with a digital direct synthesis circuit DDS is used to generate the master clock for the standard sampling frequencies guaranteeing low jitter operation The DAT3000C01 also...

Страница 6: ...nsformer isolated digital audio outputs Each digital audio output is available on two connectors Accepts three different reference signal types black burst word clock and AES EBU digital audio Digital audio reference input provides loop through is balanced and is transformer isolated Word clock and black burst reference inputs provide loop through and are coaxial Both the sampling frequency and th...

Страница 7: ...Albalá Ingenieros Manual DAT3000C01 1 3 Block diagram 7 ...

Страница 8: ...Albalá Ingenieros Manual DAT3000C01 DAT3000C01 8 ...

Страница 9: ...nced Encoding and electrical characteristics According to EBU Tech 3250 E AES3 standard Sampling rate 32 kHz 44 1 kHz 48 kHz 64 kHz 88 2 kHz and 96 kHz Number of outputs 2 per section Jitter 300 psRMS AES digital audio signal Sample rate converter Number of bits 24 Input to output sample ratios 7 1 to 1 7 Harmonic distortion plus noise THD N 116 dB measured with a 997 Hz 1 dBFS tone Input to outpu...

Страница 10: ... digital audio reference signal input Connector Plug in terminal 3 81 mm pitch Impedance Loop Through or 110 Ω loaded Type Transformer balanced Encoding and electrical characteristics According to EBU Tech 3250 E AES3 standard Sampling rate 32 kHz 44 1 kHz 48 kHz 64 kHz 88 2 kHz and 96 kHz Word clock reference signal input Connector BNC Type Passive Loop Through or 75 Ω loaded Sampling rate 32 kHz...

Страница 11: ...ns This equipment must be connected to a mains outlet with a protective earth connection Never use extension cords that do not have protective earthing connection The lack of an effective electrical connection between the ground pin in the mains input connector of the equipment and the protective earth of the electrical power distribution can cause serious harm All modules of the Albalá Ingenieros...

Страница 12: ...hat this equipment must be deposited at a collection point for proper waste treatment once it has reached the end of its useful life 3 4 Power considerations The UR3000 and UR3100 mounting frames can house as many DAT3000C01 modules as will fit in them 3 5 Module configuration The DAT3000C01 provides multiple program jumpers for configuration In addition to mechanical installation of the module in...

Страница 13: ...ples delivered at the outputs of the DAT3000C01 can be 20 or 24 bits This selection is made via switch 2 of S1 as shown in the following table LEVEL SW2 0 dBfs OFF 18 dBfs ó 20 dBfs ON 3 5 3 Selection of the external reference The word clock and black burst external reference inputs use the same connectors on the rear board and the type of signal that will be applied must be programmed These input...

Страница 14: ...00C01 module has two operating modes for selection of the reference input and the sampling frequency automatic or manual In automatic mode the reference input and the sampling frequency are adjusted automatically based upon a prioritized set of criteria In manual mode the user selects the desired reference input and the sampling frequency for the converter Selection of the operating mode is made v...

Страница 15: ...wn in the following table S1 SELECTIONS FOR VARISPEED MODE SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 X X ON OFF OFF ON ON ON The DAT3000C01 comes from the factory with the following settings Operation at 20 bits at the inputs and outputs Automatic mode for selection of the reference input and the sampling frequency Loop through for the signal inputs The coaxial reference set for black burst signal 3 6 Insta...

Страница 16: ...nfigured according to the user requirements The configuration process is detailed later in the INSTALLATION section of this manual 6 Insert the DAT3000P01 board main board of the DAT3000C01 module into the front of the mounting frame The edges of the card slide into two plastic guides inside the mounting frame 7 Affix the main board to the mounting frame using the two screws included on the front ...

Страница 17: ...ough inputs AES EBU REF LOOP IN and REFERENCE IN BB WCLK for reference signals and one input for a delay signal TTL DELAY The rear interconnection board is not designed to withstand mechanical stress The wiring must be fastened properly to the frame where the mounting frame is housed to prevent the rear board from supporting the weight of the cables 3 7 1 Digital audio connections Digital audio in...

Страница 18: ... audio outputs are balanced use 3 81 mm pitch terminal block connectors and their characteristic impedance is 110 Ω If an output signal in AES3id format is needed an adapter as shown in the figure can be built Albalá Ingenieros does not provide this adapter TWISTED PAIR TO COAXIAL ADAPTER AS PER AES3id For digital audio connections 110 Ω characteristic impedance two wire shielded cable is preferre...

Страница 19: ...ont panel indicators of the DAT3000C01 module and their remote control and monitoring ability 4 1 Front panel description The appearance of the front panel and the elements it contains are shown in the following illustration Front panel of the DAT3000C01 The panel contains the following elements 19 ...

Страница 20: ... of the range of 32 to 96 kHz then all LEDs remain off These LEDs indicate the sampling frequency at which the stream is being received not the true sampling frequency of the audio contained in the stream Therefore when a signal is received at twice a given sampling frequency for example at 192 kHz then the LED for 96 kHz lights up In the center box on the right 1250ms 1000ms 750ms 500ms 250ms 0ms...

Страница 21: ...ows the signal flow within the DAT3000C01 handy SIGNAL FLOW DIAGRAM 4 2 1 Description of the sampling frequency converter Conversion of the sampling frequency is performed with an initial oversampling process followed by low pass digital filtering to limit the bandwidth and provide decimation to the new sampling frequency This entire process if performed by a modern highly integrated circuit The s...

Страница 22: ... the module operates as two completely independent delayers capable of processing two AES EBU streams of different frequencies or even different sampling modes normal or double frequency The frequency conversion process is not instantaneous due to the need for digital filters The audio delay between the input and the output is always less than 1 5 ms as long as the delay input is set to its minimu...

Страница 23: ...nnel information and relocating the corresponding bits to the output status channel In the second mode a portion of the status bits can be replaced by other bits stored in the EEPROM of the module that can be modified by the user Selection of the status channel operation mode is performed via the control software This is done by acting upon four of the 24 blocks of bytes contained in the status ch...

Страница 24: ...ning that it substitutes the contents in Block 1 2 3 and 4 with the values stored in the module s memory The default values are displayed in the previous table 4 2 4 Description of the processing unit The DAT3000C01 contains an audio signal processing unit that includes a small selection matrix from four inputs to four outputs independent level adjustment for each output of the matrix and two summ...

Страница 25: ...y the possibility of overload is avoided AUDIO POST PROCESSING BLOCK OF THE DAT3000C01 Pay particular attention to the configuration of this processing block when using audio signals at 192 kbit s It is also important to pay attention to the channel management when the sampling rate frequency converter is not used Each section has its own data clock and for this reason audio channels from one sect...

Страница 26: ...e channels received Channel A in Section 1 and Channel B in Section 2 The following table shows the distribution of the channels that are obtained for the different combinations of doubled sampling frequency at the input and output Keep in mind that the input of Section 2 is not used when a doubled sampling frequency is needed at the output only and that if a doubled sampling frequency is needed o...

Страница 27: ...e to operate with any sampling frequency in the range from 32 to 96 kHz This mode is employed with non standard sampling rates meaning frequencies other than 32 44 1 48 64 88 2 or 96 kHz The variable speed mode only functions when the reference input is digital audio in AES EBU format as per AES11 4 2 8 2 Operation in Automatic Mode When the DAT3000C01 functions in Automatic Mode selection of the ...

Страница 28: ...es that should correspond to one of the standard values If the frequency of the TTL signal is not a standard value then the DAT3000C01 s oscillator will not be able to sync The same connector is used for both the video reference input and the word clock reference input Selection between the two input types is performed using the module s internal program jumpers 4 2 8 3 Operation in Manual Mode Th...

Страница 29: ...ion The DAT3000C01 can optionally be remotely controlled supervised In order to perform remote configuration and supervision of the module an optional TL3000 family remote communications controller must be installed in the mounting frame The main function of the communications control module is to interface between a 10 100 Ethernet port an EIA RS232 or an EIA RS485 serial port and the internal bu...

Страница 30: ...n be controlled and supervised remotely for each version of the firmware are listed below VERSION 1 X CONTROL Name add ext msk snmp trap Description IN_BITS 0x00 0x01 Y N Allows selecting the number of bits in inputs 0 20 1 24 OUT_BITS 0x00 0x02 Y N Allows selecting the number of bits in outputs 0 20 1 24 MODE 0x00 0x04 Y N Allows selecting the reference selection mode 0 Auto 1 Manual INPUT_REF 0x...

Страница 31: ... AES2 channel B 0 AES1_chA 1 AES1_chB 2 AES2_chA 3 AES2_chB STATUS Name add ext msk snmp trap Description DET_625 0x00 0x01 N N 625 lines signal detected 0 No 1 Yes DET_525 0x00 0x02 N N 525 lines signal detected 0 No 1 Yes OUT_FREQ 0x00 0x70 Y N Indicates the actual output sampling frequency 1 32 kHz 2 44 1 kHz 3 48 kHz 4 64 kHz 5 88 2 kHz 6 96 kHz AES_DET_FREQ 0x01 0x07 N N Indicates the AES ref...

Страница 32: ...Albalá Ingenieros Manual DAT3000C01 DAT3000C01 32 ...

Страница 33: ...interface originally transmitted two channels one pair with PCM coding with a bit depth of 20 or 24 bit and a sampling frequency between 32 kHz and 192 kHz Today the interface is also used as a framework to transmit digital signals that may or may not be audio with linear PCM encoding The physical interface defined by the original AES EBU standard was a 110 ohm balanced line The AES3 id standard l...

Страница 34: ...Albalá Ingenieros Manual DAT3000C01 DAT3000C01 34 ...

Страница 35: ...Serial transmission format for two channel linearly represented digital audio data See also EBU Tech 3250 E ITU R BS 647 2 AES3id 1995 AES information document for digital audio engineering Transmission of AES3 formatted data by unbalanced coaxial cable EBU Tech 3250 E 1992 Specificacion of the digital audio interface See also AES3 ITU R BS 647 2 ITU R BT 470 6 1998 Conventional analogue televisio...

Страница 36: ...Albalá Ingenieros Manual DAT3000C01 DAT3000C01 36 ...

Страница 37: ...Albalá Ingenieros Manual DAT3000C01 7 VERSIONS Ver Date Description 0 0 13 06 2013 Preliminary Version 1 0 21 12 2016 First version ...

Страница 38: ...Albalá Ingenieros S A Medea 4 28037 Madrid Spain 34 913274453 www albalaing com info albalaing com ...

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