Applications
- In-line audio recording;
- Personal audio recording;
- Small offices and visiting meetings.
Description
VOCORD A2 USB is a low-cost external adaptor with USB connection. It is designed for digitizing, computer input and processing analog signals from 2 sources. Signal may belong to the following sources: analog phone lines, microphones (including those with phantom power), analog play/line out jacks of different devices - radio stations, tape recorders etc.
Main Advantages of VOCORD A2 USB
- Complete functionality of VOCORD Audio system software;
- Portable size;
- High mobility;
- USB port power supply.
Technical Specifications
| Parameter | Value |
|---|---|
| Number of channels | 2 |
| Preset operation mode for each channel | Phone line, VOX, special alarm system |
| PC interface | |
| USB version | 2.0 (full speed) |
| Telephone interface | |
| Interface type | Two-wire |
| Input resistance | 2 MOhm |
| Frequency range | 300 - 3500 Hz at 8 kHz; 300 - 7000 at 16 kHz |
| Connector | RJ 45 |
| Analog interface | |
| Input range (variable component) | Up to ±3V (amplitude) |
| Input signal constant component | Up to ±200 V |
| Bit capacity of analog-to-digital converter | 16 bit |
| Sampling rate | 8 kHz; 16 kHz |
| Frequency response nonlinearity | max ± 1dB |
| Harmonic factor | max 0.05% |
| Input signal preamplifier (separate for each channel) | [0: 12] dB (increase interval is 1.5 dB) |
| Signal/noise ratio (amplifying 0 dB) | 80 dB at 8 kHz, 74 dB at 16 kHz |
| In-phase rejection in the range of [0 - 150] Hz | 74 dB |
| Sound processing | |
| AGC range | Up to 18 dB (program-preset) |
| Program-preset audio compression algorithm | PCM16 without compression, A-law G.711 compression 2:1, µ-law G.711 compression 2:1, GSMb.10 compression 10:1 |
| Additional functions | |
| Remote user number identification | CALLER ID |
| Detection of calling signal | DTMF and pulse dialing |
| Voice activity detection | VOX mode (program-preset) |
| Electret microphone support | Phantom power 8 V, 1 kOhm, balanced input |
| Power | |
| USB port power | < 100 mA |
| Operation temperature | from 0°C to +50°C |
| Storage temperature | from -20°C to +70°C |
| Humidity | from 8% to 80% |
| System requirements | |
| Operating system | Windows 2000/XP/2003 |
| RAM | 128 Mb |
