Amiga Hardware DatabaseManufacturer “Albrecht Computer Technik”
5 expansions in database
Manufacturer Albrecht Computer Technik, Germany | Date 1998 | Amiga A2000, A3000, A4000 |
- digital audio interface
- connects to Prelude's 40 pin expansion connector
- built in Prelude-Bus extension so other expansions (MPEG-it! or Rombler) can still be connected
- up to 24 bit resolution, up to 96 kHz sampling rate
- fast, synchronous FIFO buffer memory and control logic for reliable and smooth full duplex operation
- own clock generation (no need to connect a reference signal to the input just to get playback)
- support for all sampling rates (32, 44.1, 48 and 96 kHz) without the need for rate conversion
- can be used to disable copy protection and to eliminate jitter
- optical and coaxial inputs and outputs (TOSLink and RCA)
Manufacturer Albrecht Computer Technik, Germany | Date 1998 | Amiga A2000, A3000, A4000 |
- MP3 decoder
- Micronas-ITT embedded MPEG decoder DSP
- plays back MPEG1, MPEG2, MPEG2.5 Layer2 (mp2) and Layer3 (mp3) audio streams with up to 48 kHz and bitrates up to 384 kbps
- almost zero processor overhead while playing back mp3 audio streams
- 24 bit DA converter
- own volume, bass and treble control
- connects to Prelude's 40 pin expansion connector
- audio is output to the AUX1 channel of Prelude's sound mixer, otherwise reserved for CD-ROM audio
- there's no direct access to decompressed audio, just the resampling through Prelude's analogue inputs
- supported by AmigaAMP
Manufacturer Albrecht Computer Technik, Germany | Date 1997 | Amiga A2000, A3000, A4000 | Interface Zorro II | Autoconfig ID 16945 / 1 |
- Crystal Semiconductor Sound Codec 4231A
- 5510-64000 Hz frequency range
- ALaw, uLaw, ADPCM compression / decompression
- MPC Level 2 compatible mixer
- dual DMA registers support full duplex operation
- two onchip FIFO buffers for higher performance
- selectable Serial Audio Data Port
- two channel simultaneous playback (simple stereo signal)
- unlike a DSP, this chip is designed solely for handling audio, it cannot for example, off-load your CPU when playing back an 8+ channel ScreamTracker file
- connectors
- LINE
- can be routed to the ADC and to the onboard mixer
- normally used for recording line level signals
- MIC
- can only be routed to the ADC, not to the mixer
- used for recording only - signal may be line or mic level
- AUX1
- can be routed to the ADC and the onboard mixer
- used for recording or mixing the audio output of a CD-ROM drive or the MPEGit MPEG audio decoder expansion module
- AUX2
- can only be routed to the mixer - cannot be used for recording
- recommended for mixing with the Amiga output
- after a reset when the card is not initialized by the mixer program, LINE out is muted and the source connected to AUX2 can only be sent to the mono output
- OUT
- goes to stereo system
- notes
- 15 pin D-SUB connector for the customizable adaptor - when ordering, the type of connector can be chosen for each input (e.g. RCA, 1/4" phone plug , 1/8" phone plug
- mixing means that the signal of that input can be mixed to the output along with other inputs, and the sound generated by the codec itself
- recording means direct recording to RAM or hard disk from that input and also using it for digital realtime effects
- 40 pin (male) expansion bus connector for expansion modules
- Rombler - wavetable / MIDI interface
- MPEG-it! - MPEG audio decoder supporting Layer II & III streams
- Arpeggiator - digital input / output (S/P-DIF) for DAT, CD, MiniDisc, etc.
- full duplex 16 bit audio sampling, mixing and playback
- sampling and playback rates up to 64 kHz even on 68000
- EMI filtering and double surge protection
- software
- Realtime F/X; u-law, A-law, ADPCM encoder / decoder; Surround Decoder; Mixer (adjusts the level of each input); tapedeck (recording one of three inputs at a time); Dub! full duplex recorder (record and playback a file at the same time); AHI
- optional Samplitude 3.0 or AudioLab16
- AHI driver
front side
back side
front side
back side
- Prelude-161.dms
install disk
prelude.library v1.61
718 kB - PreludeInstall.lha
ACT
install disk v2.0
678 kB - PreludeAHI533.lha
ACT
AHI driver v5.33
15 kB
Manufacturer Albrecht Computer Technik, Germany | Date 1998 | Amiga A1200 | Interface clock port |
- Crystal Semiconductor Sound Codec 4231A
- 5510-64000 Hz frequency range
- ALaw, uLaw, ADPCM compression / decompression
- MPC Level 2 compatible mixer
- dual DMA registers support full duplex operation
- two onchip FIFO buffers for higher performance
- selectable Serial Audio Data Port
- two channel simultaneous playback (simple stereo signal)
- unlike a DSP, this chip is designed solely for handling audio, it cannot for example, off-load your CPU when playing back an 8+ channel ScreamTracker file
- full duplex 16 bit audio sampling and playback
- 14 sampling and playback rates up to 64 kHz
- four stereo mini-jack sockets: one line level output, two line inputs, one microphone input
- one of the inputs can be used to mix the Paula audio with the Prelude output
- two piece board - the digital part connects to the clock port, the analog part fits to the spare blanking plate at the back of the A1200
- the two parts are connected with a ribbon cable
- software: Samplitude Opus Lite, AudioLab16
- AHI driver
front side
back side
front side
- PreludeInstall.lha
ACT
install disk v2.0
678 kB - PreludeAHI533.lha
ACT
AHI driver v5.33
15 kB
Manufacturer Albrecht Computer Technik, Germany | Date 1998 | Amiga A2000, A3000, A4000 |
- MIDI and wavetable interface
- extends Prelude with MIDI In and Out ports
- provides interface for a single board synthesiser with DSP effects such as the Yamaha DB50XG, Roland SCM55 or WaveBlaster CT190
- generally it supports any add-on wavetables which fit the 26 pin feature connector of a SoundBlaster
- a DB15 connector carries the MIDI signals - an adaptor (gameport - MIDI cable) converts this into five standard DIN sockets
- audio is output to the AUX1 channel of Prelude's sound mixer, otherwise reserved for CD-ROM audio
- there's no way to record the digital synth output without looping it back into Prelude's analogue inputs
- there's no access to the DSP effects for anything except wavetable sound
- the MIDI output shares the same port as the wavetable card - distinct channels have to be assigned for internal and external instruments
- supplied with CAMD driver software
- supported by Samplitude Opus
front side
back side