Cedar Audio SE1 Speech Enhancer

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Police, security and counter-terrorism forces require covert audio surveillance systems that are rugged while remaining as small and light as possible. They must be simple to operate and able to run on batteries as well as mains power so that they can (literally) be used in the field when necessary.

Designed in consultation with numerous security forces and agencies, the CEDAR SE 1 Speech Enhancer satisfies all of these criteria. It offers two channels of advanced filtering and speech enhancement in a small device that sits immediately between the probes (microphones) and the headphones. It offers minimal latency and the simplest possible controls, and has a 12V power input that allows it to run on mains or battery power, all of which make it ideal for covert surveillance and rapid tactical response.

Supplied in its own rugged case, the SE 1 itself is small enough to fit into your pocket, yet its advanced audio processing capabilities allow field operatives to monitor audio, reduce noise and improve the listenability of audio captured in adverse conditions. It's flexible too. The SE 1 integrates easily with other equipment using either analog or digital inputs and outputs, and incorporates two independent headphone outputs for live monitoring directly from the unit itself. You can use a single SE 1 to monitor two microphones in a single location, or two listeners can monitor single microphones in separate locations, or you can take the input from a single source and create two output signals—the untreated audio and the filtered audio—so that courts and investigators can hear both the original sound and the filtered version.

The SE 1's audio processing is far more sophisticated than that of conventional noise reduction products, offering two simultaneous processes that maximise listenability and intelligibility. The first is a powerful noise suppressor based upon CEDAR's ground-breaking FNR forensic noise reduction system. The second is a dynamic signal enhancement filter optimised to reveal the speech yet further, and which incorporates a limiter to avoid output clipping distortion if a sudden loud sound occurs when monitoring an otherwise quiet signal.

Uses for the SE 1 include:

• Improving signal quality and intelligibility during live surveillance
• Enhancing the clarity of real-time communications
• Making transcription easier and more accurate

• DSP:
  • Two linkable channels of CEDAR processing
  • Floating point processor, 2.4 GFLOP/s, 40-bit resolution
  • Sample Rate: 44.1 kHz
• AD/DA Conversion:
  • 24-bit linear PCM
  • Sample Rate: 44.1kHz
• Line Input:
  • Connector: RCA
  • Impedance: >22kΩ
  • Nominal Signal Level (0 dB gain): -10 dBV
  • Clipping Level (0 dB gain): +4 dBV
  • Dynamic Range (0 dB gain): >100 dB (AES17, A-weighted)
  • THD+N (0 dB gain): <0.01%
  • Maximum Gain: +20 dB
  • Minimum Gain: -6 dB
  • Maximum Input Level (-6 dB gain): +10 dBV
• Digital Input:
  • Connector: RCA
  • Format: SPDIF (IEC60958)
  • Sample Rate Sync Range: 40 kHz to 50 kHz
  • Maximum Gain: +6 dB
  • Minimum Gain: -20 dB
• Line Output:
  • Connector: RCA
  • Nominal Signal Level: -10 dBV
  • Maximum Output: +4 dBV
  • Dynamic Range: > 100 dB (AES17, A-weighted)
  • THD+N: < 0.01%
  • Output Impedance: 150Ω
  • Minimum Load Impedance: 2kΩ
  • Short Circuit Protection: Indefinite
• Digital Output:
  • Connector: Unbalanced RCA
    Format: SPDIF (IEC60958)
    Sample Rate (Internal Sync): 44.1 kHz (+/- 50 ppm)
    Sample Rate (External Sync): Locked to SPDIF input
• Headphone Output:
  • Connector: 6.35mm stereo jack
  • Maximum Output Power: 90 mW into 32Ω @ 1.7VRMS
  • Dynamic Range: > 100 dB (AES17, A-weighted)
  • THD+N: <0.05% into 32Ω @ 1VRMS (32 mW)
  • Minimum Load Impedance: 16Ω
  • Short Circuit Protection: Indefinite
• Power:
  • 8VDC to 17.5VDC (nominal 12V)
  • Power Consumption: 4W typical
  • Mains Operation (85VAC - 250VAC, 50 - 60 Hz) via supplied
  • UK/US/EU/AUS 12V adapter
• Physical:
  • Dimensions: 6.5 x 4.3 x 1.7 in | 164 x 110 x 44 mm
  • Weight: < 1.1 lb | < 500 g