- The SSW020A is equipped with an RCU01 outlet board which accommodates the following interfaces: a VGA, a network interface, two USB2.0, two sound card interfaces and a Power key. Page 6 RCU05 Outlet Board Figure 1-3 SSW020A(2.0) Rear Panel The SSW020A and SSW020A(2.0) switches support two options for power supply: 220V AC and 110V AC, which can.
- The input of the sound card mic can be taken and provided to all callers who dial into the system. Such an implementation could be used for providing a real-time radio / music channel service to callers.
Which CODECs are supported for file recording/playback?
Play/record function supports the following CODECs at a sampling rate of 8000 times per second:
1) For standard wav files: Single-channel A-Law, μ-Law and 8-/16-bit linear PCM, IMA-ADPCM, Dialogic-ADPCM (VOX), MP3, GSM and G.729A are supported. For stereophonic recording which is invoked by SsmRecStereoToFile, A-Law and μ-Law are supported.
2) For plain files (i.e. files without header information): Single-channel A-law, μ-law, 8-/16-bit linear PCM, IMA-ADPCM, Dialogic-ADPCM(VOX), MP3, GSM and G.729A are supported.
3) For standard MP3 files: Single-channel MP3 is supported.
The offered cards have an embedded ARM processor, DSP architecture, and built-in PCI plug-in design. In this card, the high resistance input port and record gateway can directly bridge the trunk line which needs to be monitored. Additionally, offered cards can be made available in bulk quantities.
Which compression format does recording use, and at what rate?
The following recording compression formats are supported:
1) IMA-ADPCM or Dialogic-ADPCM (VOX): Compression rate of 2:1, i.e. voice data are generated at 4kbps.
2) GSM: Compression rate of 5:1, i.e. voice data are generated at 1.6kbps.
3) MP3: Compression rate of 8:1, i.e. voice data are generated at 1kbps.
4) G.729A: Compression rate of 8:1, i.e. voice data are generated at 1kbps.
How to play WAV files recorded by a sound card with a Synway voice board?
The files can be directly played by Synway voice boards if the file format is supported by our product. Otherwise, they have to be converted into a supported wav format with third-party software tools such as Cooledit.
Why are noises sometimes heard in the process of file playback?
This generally happens when voice data are corrupted or when incorrect play-format is used to decode an unformatted voice file. Another reason is the voice codec being used to play files is unsupported by Synway boards.
How to play or record GSM, MP3 voice files?
To play or record GSM, MP3 voice files, you should first modify the configuration item under Section [SystemConfig] in the file ShConfig.ini to GsmCodecEnable=1, and be sure to install necessary codec engines (The engine for GSM is usually carried by Windows operating system while that for MP3 could be acquired from the DEMO package released at our website).
Synway Sound Cards App
Sound Cards 7.1