The SPNTWB combines the boards from the SPN812 and the SPNCWB in a 2RU chassis to provide a complete, stand-alone component for telepresence and audio conference systems. The unit can be used with additional ASPEN processors to add additional inputs and outputs. Setup and adjustments can be made using the control panel software or the front panel LCD interface. Inputs and outputs appearing on the LCD have been consolidated into logical groups to simplify navigation.
The far end audio signals in a conference participate in the same manner as local microphones connected to the processor. Three sites connected via two codecs and a telephone line can be bridged into a single conference as seamlessly as local microphones.
The ASPEN AEC (acoustic echo canceller) provides new and advanced algorithms developed to address the need for a single acoustic echo canceller that could handle the challenges of multi-site bridging and an unlimited number of microphones. The AEC converges very quickly, then continues to increase the cancellation depth at every opportunity as a conference continues. Cancellation depth will increase even with brief signal peaks from the far end, and convergence will never be lost with any type of signal or in double talk situations.The AEC in combination with the patented gain proportional mixing algorithm* provides outstanding audio quality without echo heard at the far ends.
Signals from the far ends of the conference are routed to the local sound system also to a final mix that is used as a reference signal by the AEC. Audio from the local microphones (which includes far end audio from the local loudspeakers) is routed to the AEC via a second final mix for cancellation of the far end signals. After processing, the output of the AEC is routed back to the far ends through the matrix.
The proprietary noise reduction filter used in ASPEN processors is a third octave dynamic processor which is very effective when applied to the far end Codec and telephone line signals when poor connections occur.
An ethernet port is provided for setup and control via standard network connections, and an RS-232 port is provided for use with remote control systems. The design allows simultaneous, multi-point third party control.
A two channel power amplifier is included for loudspeakers in the local sound system. The power amplifier is driven by final mix outputs from the matrix and has a full set of signal processing, including parametric EQ, compressor and limiter. Class-D amplification is implemented with a late generation component that provides exceptional efficiency, low heat, excellent audio performance and cannot be damaged by wiring errors.
Mic/Line Inputs: All inputs are digitally programmable-gain microphone to line level differential inputs. Either side can be grounded or left floating. The cable shield shall be connected to groundMax. input level: 20 dBuGain: 0 dB to 56 dB, programmable in 8 dB steps (the analog gain is automatically selected by selecting the input gain)Input impedance: 8 kΩ differential mode, 2 kΩ common modePhantom voltage: 48 VDynamic range: 102 dBEIN: -127 dBu (20Hz – 20kHz, unweighted)THD + noise: 0.01%Line Outputs: All outputs are floating transformerless differential outputs. Either side can be grounded or left floating. The cable shield shall be connected to ground.Nominal level: 0 dBu, channels 1-8, 0 dBu, -20 dBu, -40 dBu, channels 9-12Headroom: 20 dBOutput impedance: < 50 Ω, all outputs, at all attenuator settingsDynamic range: 105 dBTHD + noise: 0.01%Filters: All filters, including the noise reduction filter (NRF), have zero processing delay.Noise reduction filters: Adjustable 6 to 35 dB on every inputTone control stages: 4 per input channelParametric EQ stages: 8 per output channelADFE: 8 per input channel (configurable as Static or Dynamic)
Low Pass: Butterworth (6, 12, 18, 24 dB/octave) Bessel (6, 12, 18, 24 dB/octave) Linkwitz-Riley (12, 24 dB/octave) Additional parameters: frequency [Hz]
High Pass: Butterworth (6, 12, 18, 24 dB/octave) Bessel (6, 12, 18, 24 dB/octave) Linkwitz-Riley (12, 24 dB/octave) Additional parameters: frequency [Hz]
Low Shelving: Butterworth (6, 12, 18, 24 dB/octave) Bessel (6, 12, 18, 24 dB/octave) Additional parameters: frequency [Hz] boost/cut [dB]
High Shelving: Butterworth (6, 12, 18, 24 dB/octave)Bessel (6, 12, 18, 24 dB/octave) Additional parameters: frequency [Hz] boost/cut [dB]
Peaking EQ (parametric): frequency [Hz] bandwidth [octave] boost/cut [dB]
Internal Signal Generator: White noise: level [dBu] Pink noise: level [dBu] Tone (sine wave): level [dBu] frequency [Hz] Swept sine: single sweep continuous sweep Sweep Waveform: sawtooth (up or down) triangle Sweep rate: linear logarithmic Sweep Parameters: start frequency [Hz] stop frequency [Hz] level [dBu] sweep time [sec]
Latency: Single-board: 64 audio samples = 1.333 ms System: 1.333 ms (Master) + .125 ms for each Slave board Example: 2.958 ms for 192 inputs with 48 outputs (system with 2-SPN1624 and 5-SPN32i processors)
Acoustic Echo Canceller: Centralized, bridgeable for TelepresenceAEC Tail Time: 128 ms tail time - will never diverge, regardless of signal type (i.e. sine wave)Line EC Tail Time: 48 ms tail timeAEC Bandwidth: 10 kHzTelephone Hybrid Return Loss: 26 dB + line echo canceller = 45 dB
Audio inputs (Codec): Gain: -20 dB to +20 dB, programmable in 1 dB steps Input impedance: 15k ohm (differential); 375k (common) Connector: 5-pin Phoenix
Audio outputs (Codec): Floating balanced Nominal level: 0 dBu Output impedance: 50 Ω
Speaker outputs: (2) 10W, class D, BTL wiring to double power Mic/line outputs: 1-8 line level (0dBu), 9-12 mic/line level (0, -20, -40dBu)Input Dynamic Range (Codec): 102 dB (unweighted 20 - 20 kHz)Output Dynamic Range (Codec): 105 dB (unweighted 20 - 20 kHz)Audio Performance (Codec): THD + noise: 0.01%
Front Panel Connectors: • 1/4 inch headphone monitor jack with level control • Standard USB
Rear Panel Connectors: Power: IEC 60320 C14 RS-232: DB-9 Ethernet: RJ-45 Programmable Logic I/O: (2) DB-25 ASPEN port: (2) Dual RJ-45 Remote control: Dual RJ-45 Power amp output: 5-pin Phoenix Mic/Line Inputs/Line Outputs: (12) 5-pin Phoenix Telephone Set/Line: Dual RJ-11
Proprietary network: Physical level: LVDS (Low Voltage DIfferential Signal) high speed Cable type: CAT-6 Transmission speed: 1 Gbps
Programmable control inputs: Number of inputs: 30 Analog voltage range: 0-5V Logic input: TTL, LVTTL, CMOS, LVCMOS
Programmable control outputs: Number of logic outputs: 16 Logic control: active low Max sink current: 100 mA Max supply voltage: 40 V Supply voltage for control I/O: 5 V Max current: 750 mA
Cabled Remote Controls: Codec 1: Lectrosonics RCWTH4; RJ-45 jack Tel: Lectrosonics RCWTH4; RJ-45 jack
Power requirements: 100-240 VAC, 50/60 HzPower consumption: 50 Watts
Dimensions: Faceplate: Standard 19 inch 2RU Housing (WxHxD): 17.50 x 3.50 x 7.25 inches Weight: 5.65 lbs. (without AC cord)