Biquad ALO-1

Name: Biquad ALO-1
Brand: Broadcasters Warehouse
SKU: Biquad ALO-1
Price: 292 EUR
Availability: InStock
Rating: 5 (1 reviews)

1-Line Analog Phone Hybrid

Biquad ALO-1 Passive Analog Telephone Interface, 1 Line

One line hybrid telephone interface, rack standard, to be used in radio and TV studios. Has an identical circuit to all the other ALO models and does not require the use of a power supply making it easy to use.

On the telephone line input and also on the audio inputs and outputs has RFI filters avoiding electromagnetic interference. It also has protection against electric discharges from the telephone line that protects the equipment. Can work on conventional telephone lines or PBX extensions with variations between 20 and 50V with a minimum current of 20mA.

Balanced audio inputs and outputs with XLR connectors, isolated by transformers that guarantee high quality and immunity to noises, providing a clear and clean sound. Has audio control gain on the back panel.

The hybrid circuit (transformation from 2 to 4 wires) is totally electronic and active and has an adjustment for echo cancellation that provides isolation around 50dB @ 1KHz.

On the front panel, the equipment has an ON/OFF key that attends the telephone call, a call indicator led that is on while the equipment is functioning, a return volume control to the listener and also an audio output volume control to the mixing console.

Very versatile, ALO 1 is the ideal equipment to be used in transmission and recording studios in order to extract or insert quality audio on the conventional telephone line POTS.

Its case has a high standard finishing with a brushed stainless steel panel.

SYSTEM

DELAY: The maximum signal delay time on the analogue and digital outputs in relation to the input signal is less than 6ms.
DIGITAL PROCESSING: DSP: Analog Devices - ADSP Blackfin BF532 / Clock: 400MHz / MMAC: 800/32 Bits - 4 DSP cards on your motherboard
CPU: Processor: NXP- ARM-7 / LPC2387 / Clock: 72MHz / Memory: 64KB SRAM + 512 KB Flash 32 Bits
STORAGE MEMORY: Flash type with 4Mbits capacity
DISPLAY: Graphic type, monochrome, with blue background and written in white and touch screen function. Resolution: 128 x 64 pixels. Size: 3 ”
FREQUENCY RESPONSE: 1Hz to 40KHz @ 0.1 dB (Bypass mode processing - Preset: Proof of Performance)
NOISE: 100dB on analog inputs and outputs / 120dB on digital inputs and outputs.
SYSTEM HARMONIC DISTORTION:
<0.01% @ 20Hz - 1KHz - Referenced to 100% modulation;
<0.04% @ 1KHz - 15KHz - Referenced to 100% modulation;
<0.02% - SMPTE IM - Intermodulation distortion.
REMOTE INTERFACE WITH COMPUTER: Microsoft Windows 2000 (SP3 or greater), Windows XP, Windows Vista or Windows 7 operating system.
CONFIGURATION: TCP / IP protocol connected directly by USB cable or via an Ethernet connection.
USB CONNECTION: Connection to the PC through a USB 2.0 / 480Mbps port, female type B connector.
ETHERNET CONNECTION: RJ-45 female connector, 10-100Mbps, using CAT5 cable or compatible. Native speed of 100Mbps. Used for remote connection to the PC through a network switcher access port.

ANALOGUE AUDIO INPUT L / R

CONFIGURATION: Possibility of configuration: Stereo / Mono on the left channel / Mono on the right channel / Mono by the sum of both channels.
FILTER: Selectable high-pass filter (OFF / 30/40/50/60 Hz) and selectable low-pass filter (16/25 kHz)
IMPEDANCE:> 10 kΩ
CONNECTORS: Female XLR type with EMI suppression.
NOMINAL INPUT LEVEL: Adjustable via software -10 to +20 dBu.
A / D CONVERTER: AD1871 - 24 bits / 96KHz / 256x oversampled with RFI filter.

AES-3 STANDARD DIGITAL AUDIO INPUT Same features of the analogue audio input except for some specific differences of this signal format:

IMPEDANCE: 110Ω balanced and isolated via a transformer.
SAMPLING RATE: 32, 44.1, 48, 88.1 and 96 kHz automatically selected.
CONNECTORS: Female XLR type with EMI suppression.
NOMINAL INPUT LEVEL: Adjustable via software -18 dBFS to 0 dBFS
MAXIMUM INPUT LEVEL: 0 Dbfs

ANALOGUE AUDIO OUT (MONITOR)

CONFIGURATION: Possibility of configuration: Stereo / Mono on the left channel / Mono on the right channel / Mono by the sum of both channels.
OPERATION MODES: Process processed with pre-emphasis / Process processed with pre-emphasis and de-emphasis for greater control of high-frequency peaks / Mode processed without application of pre-emphasis - Flat / Bypass mode - the output is connected directly to the input signal.
FILTER: Low-pass filter (FIR) with selectable cutoff frequency (16/25 kHz).
IMPEDANCE: Source impedance - 50 Ω, electronically balanced with servo control. (Minimum acceptable load impedance: 600Ω or greater - balanced or unbalanced).
OUTPUT LEVEL: Adjustable between -11 dBu to +18 dBu for 100% peak modulation @ 600Ω load or greater.
SIGNAL RELATIONSHIP x NOISE: ≥ 100 dB without weighting (Bypass mode, 30 Hz - 15 kHz, referenced to 100% modulation).
CROSSTALK: ≤ -85 dB, 30 Hz - 15 kHz.
HARMONIC DISTORTION: ≤ 0.04% THD (Bypass mode, 30 Hz - 15 kHz)
CONNECTORS: Male XLR type with EMI suppression.
D / A CONVERTER: PCM 1796 - Burr Brown: 24 bits / 96KHz / 256x oversampled with RFI filter.

DIGITAL AUDIO OUT (MONITOR) Same features of the analogue audio output except for some specific differences of this signal format:

IMPEDANCE: 110Ω balanced and isolated via a transformer.
OUTPUT LEVEL: Adjustable between -20 dBFS to 0 dBFS for 100% peak modulation.
SIGNAL RELATIONSHIP x NOISE: ≥ 120 dB without weighting (Bypass mode, 30 Hz - 15 kHz, referenced to 100% modulation).
CROSSTALK: ≤ -120 dB, 30 Hz - 15 kHz (Stereo Mode)
HARMONIC DISTORTION: ≤ 0.01% THD (Bypass mode, 30 Hz - 15 kHz)
SAMPLING RATE AND RESOLUTION: 24 Bit / 96 kHz
CONNECTORS: Male XLR type with EMI suppression.

ANALOGUE AUDIO OUT (TX) Two outputs with individually controlled levels through software.

Balanced MPX Output - Electronically balanced with floating earth and buffered for minimum loads of 8Ω, it can be configured to provide the 19KHz pilot signal.
Unbalanced MPX Output - Electronically “buffered” to support loads with a minimum of 8Ω.
SOURCE IMPEDANCE: 20Ω for the balanced output / 10Ω for the unbalanced output.
LOAD IMPEDANCE: ≥ 8Ω
MAXIMUM OUTPUT LEVEL: +18 dBu (17.5 Vpp) with 0.5 dB resolution for 600Ω minimum impedance.
MINIMUM OUTPUT LEVEL: -12 dBu (0.69 Vpp) with 0.5 dB resolution for 600Ω minimum impedance.
PILOT LEVEL: Adjustable from 5% to 15% via software for 100% modulation.
PILOT STABILITY: 19 kHz, ± 0.5 Hz (10 to 40 ° C)
D / A CONVERTER: PCM 1796 - Burr Brown: 24 bits / 192KHz / 128x oversampled.
NOISE SIGNAL RATIO (Y / N): ≥ 85 dB without weighting (Bypass mode, with 75us de-emphasis, 20 Hz - 15 kHz, referenced to 100% modulation).
STEREO SEPARATION: ≥ 60 dB, 50 Hz - 15 kHz for 100% modulation = + 4dBu peak output level (3.5Vpp).
LINEAR CROSSTALK: ≤ -80 dB, measured from the main channel (main channel) in relation to the sub-channel (channel modulated at 38KHz) or vice versa. (Referenced to 100% modulation)
NON-LINEAR CROSSTALK: ≤ -80 dB, measured from the main channel (main channel) in relation to the sub-channel (channel modulated at 38KHz) or vice versa. (Referenced to 100% modulation)
HARMONIC DISTORTION: ≤ 0.02% THD (Bypass mode, with a de-emphasis of 75us, 20 Hz - 15 kHz, referenced to 100% modulation, without weighting)
38 kHz SUPPRESSION: ≥ 70 dB (referenced to 100% modulation).
76 kHz SUPPRESSION AND SIDE BANDS: ≥ 80 dB (referenced to 100% modulation).
PILOT PROTECTION: ≥ 60 dB relative to 9% pilot injection, ± 250Hz
SECONDARY CHANNEL PROTECTION (60 - 100 kHz): ≥ 70 dB referenced to 100% modulation.
57 kHz PROTECTION (RDS / RBDS): ≥ 50 dB realistic at 4% secondary signal injection, ± 2.0 kHz
CONNECTORS:
Balanced Output: Type BNC female with EMI suppression with a positive and negative sign. Ground isolated from the chassis.
Unbalanced Output: Female BNC type with EMI suppression with positive signal and ground. Connector ground common to the chassis.