Voice Data Formats
In the recording process, a modem transforms sound signals into digital Voice Data Format. When playing a voice message, a modem converts digital Voice Data Format into sound signals . There are different Voice Data Formats. Each format consists of three parts: audio compression method, bits per sample and sampling rate.
Fax Voip T.38 Modem supports the following Voice Data Formats:
0, "16-BIT LINEAR", 16bits, 8000Hz
1, "UNSIGNED PCM", 8bits, 8000Hz
4, "ULAW ", 8bits, 8000Hz
5, "ALAW ", 8bits, 8000Hz
128, "8-BIT LINEAR", 8bits, 8000Hz
130, "UNSIGNED PCM", 8bits, 8000Hz
131, " ULAW ", 8bits, 8000Hz
132, " ALAW ", 8bits, 8000Hz
133, "16-BIT LINEAR", 16bits, 8000Hz
Supported Voice Data Formats are listed in the Supported audio formats panel as shown at the picture below.
Nevertheless, not all Voice-Fax-Modem programs make it possible to choose a specific format. Moreover different programs can understand the same format in different ways, for example to use reverse bit order. This brings some difficulties when setting up the voice functions in your program. Typically, the Voice-Fax-Modem program takes the decision to use a specific Voice Data Format depending on the results of Auto-detection of the modem. If you have any problems with voice, you should try to select another Voice Command Set (or select another compatible type of modem) in your program manually. For your convenience we have placed a list of supported Voice Data Formats in the Fax Voip T.38 Modem Control Panel.
Notes