Biquad DAP4-AM

AM Audio Processor

Biquad DAP4 Digital 5 Band AM Broadcast Sound Audio Processor.

Audio processor with digital DSP technology specially developed for audio processing and modulation control on AM radio stations.

Has digital and analogue audio input and output format and specific filters for audio processing in modulated amplitude.

Processes two audio channels (left and right) separated or mono, has AGC input with 2 independent bands and a multi-band processing with AGC and limiters in 5 independent bands, plus a unique intelligent control pre-emphasis optimised for audio processing in AM, this optimised pre-emphasis provides a powerful audio on the station undeniably more evident than your competitors.

It has specific tools and resources for processing in AM that provide a extremely competitive and high fidelity audio with specific filters and asymmetry control, ensuring a powerful modulation with great sound differential.

Can be controlled by software from anywhere through the internet or locally through a USB connection. This control software is completely intuitive and easy to operate.

The equipment already has 20 factory predefined presets for several different types of programming and 20 more presets that can be customised by the user. Its also possible to schedule the automatic preset change during the day or during the week.

t has a touch screen display on the front panel that allow to access some of the control parameters and readings of the equipment.

Provided in a standard 19″ rack width and two unit rack height (2UR) and 30cm deep in high standard finishing in brushed stainless steel.

  • DELAY:
    • The maximum signal delay time on the analog 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 of 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 processing - Preset: Proof of Perfomance)
  • 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 via USB cable or via an Ethernet connection.
  • USB CONNECTION:
    • Connection to the PC via 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 via a network switcher access port.

2. 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 ENTRY LEVEL:
    • Adjustable via software -10 to +20 dBu.
    • A / D CONVERTER: AD1871 - 24 bits / 96KHz / 256x oversampled with RFI filter.

3. AES-3 STANDARD DIGITAL AUDIO INPUT

Same features of the analog audio input except for some specific differences of this signal format:
  • IMPEDANCE:
    • 110Ω balanced and isolated via transformer.
  • SAMPLING RATE:
    • 32, 44.1, 48, 88.1 and 96 kHz automatically selected.
  • CONNECTORS:
    • Female XLR type with EMI suppression.
  • NOMINAL ENTRY LEVEL:
    • Software adjustable -18 dBFS to 0 dBFS
  • MAXIMUM INPUT LEVEL: 0 Dbfs

4. ANALOGUE AUDIO OUT (MONITOR)

  • CONFIGURATION:
    • Possibility of configuration: Stereo / Matrix L + R and LR / Mono by the left channel / Mono by the right channel / Mono by the sum of both channels.
  • OPERATING MODES:
    • Process processed with pre-emphasis / Process processed with pre-emphasis and emphasis for greater control of high frequency peaks / Process processed without application of pre-emphasis - Flat / Bypass mode - the output is directly connected to the input signal.
  • FILTER:
    • Low-pass filter (FIR) with selectable cut-off 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 TO NOISE RATIO:
    • ≥ 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.

5. ANALOGUE AUDIO OUT (TX)

The DAP4 TV processor has 2 balanced analog audio outputs, intended for connection to the modulator / transmitter, and can be configured in different ways to meet different needs. These outputs have high current drivers, capable of supplying loads of at least 50Ω.
  • Stereo Linked
    • The outputs become stereo for sending to a BTSC encoder and the settings for each output are “linked” to facilitate operation and minimize errors.
  • Dual Mono
    • Configuration used to send audio to up to two mono modulators / transmitters with independent settings for each one.
  • OPERATING MODES:
    • Process processed with pre-emphasis / Process processed with pre-emphasis and emphasis for greater control of high frequency peaks / Process processed without application of pre-emphasis - Flat / Bypass mode - the output is directly connected to the input signal.
  • FILTER:
    • Low-pass filter (FIR) with selectable cut-off 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 TO NOISE RATIO:
    • ≥ 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.

6. DIGITAL AUDIO OUT (TX)

  • OPERATING MODES:
    • Process processed with pre-emphasis / Process processed with pre-emphasis and emphasis for greater control of high frequency peaks / Process processed without application of pre-emphasis - Flat / Bypass mode - the output is directly connected to the input signal.
  • IMPEDANCE:
    • Source impedance: 110 Ω, electronically balanced and isolated by transformer.
  • OUTPUT LEVEL:
    • Adjustable between -20 dBFS to -0 dBFS for 100% peak modulation.
  • SIGNAL TO NOISE RATIO:
    • ≥ 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.

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