The ASD8V is a new generation crystal controlled AES GRADE-1 Digital Reference Generator designed to operate as a master or as a slave in a Video/Audio studio environment. It generates PAL 25 Hz, 625 lines interlaced composite video,NTSC 29.97 Hz, 525 lines interlaced composite video, AES 11 and SDIF-2 Word clock. It supports the standard 44.1 kHz, 48 kHz and 96 kHz output sample rate frequencies, but it is also able to output a wide range of non-standard clocks (like f.ex. ProTools superclock) on the AUX outputs It synchronizes to standard PAL 25 Hz, NTSC 29.97 Hz or SECAM video, 10 MHz GPS clock, 1PPS GPS (the global time update pulse), 2.048 MHz clock (optionally E1 G703/G704 ), SDIF-2 Word and AES/EBU. The 1PPS GPS input works in combination with the 10 MHz signal from a GPS receiver, providing the positional information necessary to align the video frame (frame 1 in the PAL-8 sequence) to the global time update pulse of the GPS satellite system.

An optional decoder board for the 2Mbit E1 CCIT G703 line is available. The board has a transformer balanced E1 line receiver interface, which performs clock recovery and jitter attenuation. The jitter attenuator is based on a crystal controlled reference clock, able to phase lock to the recovered clock.

The General Purpose Unit is a sturdy 19 inch 1 Unit frame made from 1,5 mm plated steel. It has a linear "quiet" mains power supply and four individually HF screened compartments, interconnected by a power supply bus and a 10 bit digital communications bus. The GPU module mounted in the frame is fully encapsulated in a Faraday metal cage, and it is electrically isolated from the PSU bus by efficient on card low pass filters on all power lines. The interference between modules is extremely low, as signals have to cross a 6th order filter barrier and two Faraday cages. The result is an electrical isolation between modules in excess of 140 dB. The 10 bit GPU bus enables reference signals from generator modules to run digital asynchronous devices in perfect controlled sync. Due to the broad range of modules that already are available, the Yamaha Standard was adopted using I/O connections via industry standard 25 pole SUB-D connectors on the back panel. The pin configuration on the SUB-D connectors depends on the module installed in the corresponding slot. Converter panels between SUB-D and XLR/BNC connectors are available upon request.

A crystal controlled reference and master clock generator. A powerful building block, used when asynchronous digital output modules installed in the GPU frame has to be synchronized by the GPU bus. It synchronizes all digital outputs by means of an internal  crystal oscillator, able to phase lock to an external PAL Video, Word or an AES digital audio signal. Besides controlling the modules via the GPU bus, two 75 Ohms Word outputs and two 110 Ohms RS422 transformer balanced AES outputs are available on the back panel. 44.1 kHz, 48 kHz or 96 kHz sampling frequency is selected by the pushbutton on the front. It locks the AES Z-preamble (at 48 and 96 kHz) or the AES X-preamble (at 44.1 kHz) to the video frame start, as prescribed in the AES recommendations. The design is based on an extensive sync safety philosophy, featuring a unique glide principle and an internal flywheel, guarding efficiently against sync drop outs. The phase locked loop exhibits an excellent Jitter Rejection Ratio, and is able to clean up and stabilize a jittery house sync.

A crystal controlled reference and master clock generator. A powerful building block, used when asynchronous digital output modules installed in the GPU frame has to be synchronized by the GPU bus. It synchronizes all digital outputs by means of an internal AES GRADE 1 crystal oscillator, able to phase lock to an AMI (Alternate Mark Inversion) coded 2Mbit E1 CCITT G.703 signal, a 2.048 MHz. E1clock or a 10 MHz clock from GPS receivers. Besides controlling the modules via the GPU bus, two 75 Ohms Word outputs and two 110 Ohms RS422 transformer balanced AES outputs are available on the back panel. 44.1 kHz, 48 kHz or 96 kHz sampling frequency is selected by the pushbutton on the front. The Generator has a transformer balanced E1 line receiver interface, which performs clock recovery and jitter attenuation by means of a local crystal controlled reference. It phase locks the AES and word output sampling frequency to the incoming sync by an advanced two step phase lock process, providing an impressive jitter and wander attenuation which enables the generator to clean up and stabilize an erratic and jittery house sync. The input circuit has a jitter tolerance exceeding the requirements of publications 43802,43801, 62411 amended, TR-TSY-000170 and CCITT REC. G.823. .

A 96 kHz, 24 bit, low noise, 7th order Sigma Delta Digital/Analog Converter with 128x oversampling and on-chip 8x interpolation filter. It has Out of Band noise filtering and excellent linearity performance. It features digitally controlled analog soft mute and a true balanced analog architecture with electrically balanced output buffers. The AES input is transformer balanced 110 Ohms. Excellent data: Resolution 24 bits. Sample rate range 30 – 100 kHz. D-range 115 dB (A) THD+N –96 dB. Linearity 0 dBFs to -110 dBFs is better than 1 dB.

The DAA192 is a truly high-end advanced reference class DA converter. It features digital asynchronous 24 bit sample rate conversion, 192 kHz 24 bit DA converters operating in a complimentary coupling, crystal controlled output clock and State of The Art analog filtering. It has a transformer balanced AES input and a S/PDIF consumer input. Switching between inputs is automatic by priority: 1. AES, 2. S/PDIF. The incoming digital audio signal is internally upsampled to 108 kHz before it is applied to the DA converters. The transfer of audio data from the SRC to the DA converters is controlled by a crystal clock providing excellent jitter isolation and optimum working conditions for the analog conversion process. The DA conversion is performed by two 24 bit 192 kHz sigma-delta converters operating in a balanced complimentary coupling, canceling out the main part of the HF components generated by the sigma-delta process, and at the same time lowering the general noise floor. Removal of the remaining noise above the audio band is performed by State of The Art analog filters with flat group delay and linear phase characteristics. Typical data: 16- 24 bit input word. Input sampling rate 36 kHz – 108kHz. D-range 120 dB (A). THD+N –102 dBFs. Linearity 0 dBFs to -120 dBFs is better than 1 dB. AES input transformer balanced 110 ohms. S/PDIF input unbalanced 75 ohms. Electrically balanced outputs 15 ohms.

96 kHz, 24 bit dual-bit Sigma Delta Analog/Digital Converter with linear phase digital anti aliasing filter and digital decimation. It has electrically balanced input circuitry and transformer balanced 110 Ohms RS422 AES output. It is able to synchronize to external AES or to local GPU bus. When the converter synchronizes to external AES, all channel status bits, validity bits and user bits are transparently transferred from the external AES sync to the AES output, substituting only the incoming audio data bits with the audio data bits from the A/D converter chip. When the converter synchronizes to the GPU bus, an Out of Sync Detector constantly compares the block position of the AES output with the block position of the GPU bus, ensuring perfect sync between the digital outputs of all modules installed in the GPU frame. Excellent data: 24 bit output word. Sampling rate range 30 kHz – 100 kHz. D-range 115 dB (A). THD+N –105 dBFs. Crosstalk L/R –100 dB. Input CMRR 80 dB. Linearity from 0 dBFs to -120 dBFs is better than 1 dB.

Two independent digital asynchronous 24 bit sample rate converters in one module. All AES inputs and outputs are 110 Ohms transformer balanced. It is able to synchronize to external AES or to local GPU bus. When the converter synchronizes to external AES, all channel status bits, validity and user bits are transparently transferred from external AES to the AES output, substituting only the incoming audio data bits with the data bits from the SRC converter chip. When the converter synchronizes to the GPU bus, an Out of Sync Detector constantly compares the block position of the AES output with the block position of the GPU bus, ensuring perfect sync between the digital outputs of all modules installed in the GPU frame. Excellent data: 24 bit I/O words. Sampling rate range 30 kHz – 108 kHz. D-range 120 dB. THD+N –115 dBFs. Conversion range 3:1/1:3.

AES distribution amplifier with eight individually buffered outputs available when receiving AES from other modules via the GPU bus. One input and seven outputs when used to distribute an external AES input. All in and outputs are 110 Ohms transformer balanced

A word distribution amplifier module with eight individually buffered outputs. All eight outputs are available when receiving signals via the GPU bus. One input and seven outputs are available when the external Word input is used. The WDIS8 is more than just a word distribution amplifier It is able to decode the GPU signals from a reference generator (like the DSG3 or DSG5E) into a variety of clock signals, used to synchronize a range of popular PC based signal processors, HD recording systems, DVD mastering equipment etc. Each output can be individually configured by internal jumpers to: 1xFs, 2xFs, 4xFs, 8xFs, 16xFs, 32xFs, 64xFs, 128xFs or 256xFs. When used with the DSG3 or DSG5E Reference Generators, Fs can be selected to 44.1 kHz, 48 kHz or 96 kHz, giving output frequencies from 44,1 kHz to 24,576 MHz. The external input has pulse shaping circuitry with 0,3 Volt sensitivity, impedance 10 kohms. All outputs are TTL compatible, 75 ohms single ended.

The T535E Transmitter Interface module is designed to operate in the GPU frame as an extension of the DSG3 or the DSG5E Reference Generators. It will  lock to the GPU bus output from the DSG3/DSG5E or to an external 2.048MHz clock and generate a  2Mbit E1 ITU-T G703/G704 reference signal. The Transmitter Interface supports AMI or HDB3 line encoding, unframed G703 (All Ones Mode), basic G704 framing or G704 CRC-4 multiframe mode. Four ITU G703 compliant E1 line outputs and four TTL compatible 2.048 MHz clock outputs are available. When the Transmitter Interface is used with the DSG3/DSG5E, the outputs exhibits all the qualities of the DSG3/DSG5E signal, when it comes to sync safety and low jitter. When it is used with an external 2.048 MHz reference, the circuit performs direct conversion into E1 signal, with a basic jitter attenuation but no flywheel operation. The combination of the DSG3 and the T535E provides reference conversion from PAL or SECAM Video, Word or AES to 2Mbit E1 ITU-T G703/704 and 2.048 MHz clock. The combination of the DSG5E and the T535E provides reference conversion from 2Mbit E1, 2.048 MHz clock or 10 MHz GPS to 2Mbit E1 ITU-T G703/704 and 2.048 MHz clock.

The AS41 is an automatic and manual 4 into 1 data switch intended for use in the GPU frame. The switch runs in two distinct modes, E1 G703/704 or 2.048 MHz mode, selected by a jumper on the PCB. When the G703/704 mode is selected, input signals are routed to four independent transformer balanced receiver channels, compliant with ITU G.703 Pulse Mask Template for 2.048Mbps (E1) Rates. Each channel performs the receiver functions necessary to provide a LOS indication signal with thresholds and delay that comply with the ITU G.775 requirements. The LOS signals are sent to the microprocessor to facilitate auto switching. When the 2.048 MHz mode is selected, input signals are routed to four independent TTL compatible input circuits with peak detectors and comparators with fixed thresholds and fast attack and release times. The LOS signals are sent to the microprocessor to facilitate auto switching. The data switch circuitry performs active pulse shaping before the selected input signal is routed to the output. The auto/manual switching function is identical in both modes and has a fast and a slow mode setting. In fast mode, the circuit switches IMMEDIATELY when the input detector declares the input not valid. In slow mode, the circuit will accept an absence of signal for 1 second before declaring the input not valid. If the signal returns before the 1 second time out, the switch will not initiate an input jump.

The ROSTEC LDIS8 is a general purpose DC - 30 MHz linear distribution amplifier intended for use in the studio and broadcast environment. The amplifier architecture is bipolar throughout, which means it can handle signals with both positive and negative voltage swing.

It is especially well suited to distribute such signals as PAL/NTSC video, T1/E1 G704/703 signals, SPDIF digital audio or various impulse and DC control signals. Eight outputs are available when receiving signals via the GPU bus. One input and seven outputs are available when the external input is used.

 

The input circuit is unterminated and electronically balanced but can be configured to unbalanced configuration by means of a jumper. The gain can be set to 1x for unterminated signals and 2x for terminated signals (termination halves the amplitude). The input circuit also features an adjustable shelving equalizer enabling it to compensate for high frequency loss in cables. A low cut filter at 3 Hz for AC operation is also available.

 

The signal from the input circuit is fed to eight identical buffers. Each buffer has an adjustable gain of +/- 6 dB. The output impedance is 75 ohms and the maximum voltage swing is 14 volts PP with no load, 7 Volts PP into 75 ohms.

The input signal is also fed to the GPU bus buffer to be routed to the other cards in the frame, thus allowing for 4 cards in the GPU frame to distribute the same signal, i.e. one input and 31 outputs.

 

Although the LDIS8 is not intended for high quality audio, it actually handles analog audio signals up to +12 dB pretty well, with reasonable low noise and low distortion. The noise in the audio band is 104 dB(A), the distortion is 0.01 %.

 

 

The ASD16HD is a high performance, high precision Digital Reference Generator designed to operate as master or as slave in a broadcast, video or audio studio environment. It runs on an internal low jitter AES Grade 1 oven crystal reference oscillator.
It generates 16 different SD and HD video sync output formats (bi-level and tri-level), 44.1 kHz, 48 kHz and 96 kHz AES3, AES3id and Word Clock.

It features two AUX outputs that functions as Word clock multipliers, supporting up to 256 times the sample rate frequency.

 

The ASD16HD is able to synchronize to a range of input signals. It can lock the outputs to sixteen formats of incoming video sync, three AES sampling frequencies and eight clock frequencies. It has the ability to align the video frame to the 1PPS GPS pulse. A video output interlaced format will align the first frame (odd frame) to the 1PPS leading edge. A video output progressive format will align any frame to the 1PPS.

The 1PPS works together with the 10 MHz input. Both signals must originate from the same GPS receiver.

 

The ASD16HD has an extensive ability to bridge sync formats across various platforms. Whenever an integer relationship exists between the input and output Video Frame/AES block/Clock edges, the generator will lock the incoming and outgoing signals in perfect position sync.
A separate processor calculates and applies the necessary time delay for the various format combinations in order to align frames and edges perfectly.