Las-mic

Listen Through Any Window From 1 Full Mile Away!

This system is operated by transmitting an invisible IR-beam to the window of the target room. The window pane is slightly vibrating in accordance to the sound waves emanating from speech. The beam is reflected from the window pane according to the law of optics, ie. the angle of incidence is equal to the angle of reflection. The receiver picks up the reflected beam that is modulated by the window pane vibrations, and the optical signals are automatically converted into electronic signals. The picked up speech is now filtered, amplified and recorded. Both the transmitter and the receiver are built into standard single lens reflex cameras, allowing for perfect concealment. The complete system is supplied in a camera case incorporating amplifier, filters and recorder

LAS-MIC consists of three parts:

• Laser Transmitter
• Laser Receiver
• Amplifier Unit with Audio-Recorder

TRANSMITS/RECORDS

Sound wave vibrations which reflect off smooth-surface glass (single or double glass thermo pane). Transmitter laser's angle of incidence equals the angle of reflection to the receiver. Rippled or grained glass will not provide a suitable reflecting surface from which to record.

FILTERS OUT

Acoustic interference cause by interior and exterior sound wave reflections may be filtered and modulated by the LAS-MIC 's receiving system. The transmission may be fine-tuned by means of a modulated search tone or by adjusting the placement of the receiver. Tape recordings may be further edited at the user's option.

Technical Specifications

Laser Transmitter

Laser Type: Semi-conductor
Laser Wave Length: 750 - 840 nm
Output Power: 5 mW automatically controlled
Power Supply: 8 x 1.5 V AAA Battery (extern)
Current Consumption: approximate. 100 mA
Beam Focusing: 135 mm
Target Finder: through lens
Connections: 1 for power supply
Mounting: standard to fit to the tripod
Operating Time: approximate. 10 hours continuous
Other features: switchable modulation, search tone

Laser Receiver

Laser Type: noiseless PIN-Diode
Wave Length: Infrared
Lens: 500 mm
Power Supply: 9 V Block Battery
Battery Life: 15-50 hours (depending on the adjusted volume)
Current Consumption: 10 - 30 mA

Amplifier

Amplifier unit: connected by cable with Laser Receiver
Amplification: adjustable
Connections: Headphone, Speaker
Voice Filter: Equalizer, adjustable
Voice Recorder: built-in and internally connected with the amplifier

Dimensions and weight

• Dimensions: 470 x 380 x 220mm
• Weight: 10.5 kg without batteries and tripods