Vox-Send is a professional multi-channel audio transmission application designed for ThinLine/radio scanner enthusiasts and emergency service monitoring. It captures audio from Virtual Audio Cables (VAC), processes it with advanced filtering, and transmits it to rdio-scanner web platforms in real-time.
Vox-Send acts as a bridge between your radio scanner and web-based radio scanner platforms. It monitors multiple audio channels simultaneously, applies voice-optimized filtering, and uploads transmissions as they occur - making scanner audio accessible through any web browser.
Multi-Channel Support
- Monitor unlimited radio channels simultaneously
- Each channel independently configurable
- Add, remove, start, stop channels on-the-fly
Professional Audio Processing
- Voice-activated transmission (VOX) with adjustable threshold
- High-pass filter (60-300Hz) removes electrical hum
- Low-pass filter (2000-5000Hz) removes high-frequency noise
- 75µs FM de-emphasis for broadcast-quality audio
- Voice enhancement for improved clarity
- Intelligent squelch/noise gate suppresses background noise
- Adjustable input gain (1.0x - 10.0x)
Live Settings Adjustment
- Change VOX threshold while channels are running
- Adjust input gain in real-time
- Fine-tune squelch without restarting
- All changes apply instantly - no interruption
Flexible Output Options
- Upload to rdio-scanner API (Trunk Recorder format)
- Route to Virtual Audio Cable for local monitoring
- Do both simultaneously
Professional Features
- MP3 encoding (64kbps) for bandwidth efficiency
- Proper timestamps on all transmissions
- System ID and Talkgroup ID per channel
- Alphabetically sorted device lists
- Configuration auto-save/restore
- Clean, compact interface
Audio Format
- Sample Rate: 16 kHz (optimized for voice)
- Bit Depth: 16-bit PCM
- Encoding: MP3 (64 kbps) via ffmpeg
- Latency: ~100-200ms from audio input to upload
System Requirements
- Windows 10/11 (64-bit)
- Virtual Audio Cable software (VB-Audio Cable or similar)
- Scanner software (SDRTrunk, Unitrunker, DSDPlus, etc.)
- Internet connection for API uploads
- 4GB RAM minimum (8GB recommended for many channels)
- Radios or scanners outputs audio to Virtual Audio Cables
- Vox-Send monitors each VAC for voice activity using VOX detection
- When speech is detected, audio is captured, filtered, and encoded to MP3
- The MP3 file is uploaded to your rdio-scanner server with System/Talkgroup metadata
Vox-Send for ThinLine Radio - Professional multi-channel radio audio transmission made simple.