Ambe Vocoder Software Windows

The Digital Voice Systems, Inc. (DVSI) USB-3000™ is the perfect combination of DVSI's AMBE™ Vocoder Technology with a USB interface. Connect the USB-3000™ to a Windows based PC's USB port, and users can encode and decode files, or develop a customized system to process real time speech. Digital Voice System's AMBE-3000™ Vocoder Chip is an extremely flexible, voice compression solution that sets a new standard for quality, high-performance speech compression hardware. The AMBE-3000™ Vocoder Chip is a DSP-based vocoder that provides exceptional voice quality at rates as low as 2000 bps.

DVstick30 The DVMEGA DVstick30 is the successor to the DVMEGA AMBE. The DVMEGA AMBE remains available because it has the possibility to convert analogue audio directly into AMBE data without the intervention of other hardware. The DVstick 30 is the perfect combination of the AMBE-3000™ vocoder and USB interface.

Using BlueDV and the DVstick30 you can make a QSO without a radio. All you need is a Windows PC with soundcard, microphone, speaker and a DVMEGA DVstick 30. The communication speed can be set by means of hardware configuration. This makes the DVstick 30 extremely flexible and backwards compatible with existing software such as Dummy Repeater and AMBE server. Technical data – USB 2.0 Full Speed compatible.

– UART speed, configuration via Hardware, 28K8 – 460K8 – USB port powered. – DVSI’s full duplexAMBE+2™ Voice coder. – Data rates of 2.0 kbps to 9.6 kbps in 50 bps increments. – Variable FEC Rates 50 bps to 7.2 kbps. – Vocoder configuration via configuration packets. – Compatible with, BlueDV, AMBE server, Dummy repeater etc.d.

Instructions DVstick33 The DVMEGA DVstick33 is based on the AMBE3003. DVstick33 can do 3 channels transcoding for XLX systems. AMBE 3000 shield DVMEGA AMBE3000 shield fits on top of an Arduino MEGA. This board is equiped with a AMBE3000 Vocoder and PCM3500 Codec. The PCM3500 converts the analog microphone signal into a digital stream (PCM).

And that, conversely, the digital PCM stream is converted back into an analog audio signal. The digital PCM format is 8Khz with a depth of 16 bits. This would be an amount of data of 128000 bits per second. Not suitable to be sent via a 4800 bps radio connection. The AMBE3000 Vocoder makes of 128000 bps a digital signal of 3600 bps. This is the voice information and error correction codes.

These error correction codes make it possible to restore a signal which arrives corrupted at the receiver station up to a certain level. Block diagram.

Contents • • • • • • Overview [ ] In 1967 Osamu Fujimura () showed basic advantages of the multi-band representation of speech ('An Approximation to Voice Aperiodicity', IEEE 1968). This work gave a start to development of the 'multi-band excitation' method of speech coding, that was patented in 1997 (now expired) by founders of DVSI as 'Multi-Band Excitation' (MBE). All consequent improvements known as Improved Multi-Band Excitation (IMBE), Advanced Multiband Excitation (AMBE), AMBE+ and AMBE+2 are based on this MBE method. AMBE is a -based that operates at of between 2 and 9.6 kbit/s, and at a sampling rate of 8 kHz in 20-ms frames. The audio data is usually combined with up to 7 bit/s [ ] of data, producing a total RF bandwidth of approximately 2,250 Hz (compared to 2,700–3,000 Hz for an analogue single sideband transmission).

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Lost frames can be masked by using the parameters of the previous frame to fill in the gap. Usage [ ] AMBE is used by the and systems and certain channels on and is the for.

AMBE is used in digital voice communications. It has met criticism from the amateur radio community because the nature of its and licensing runs counter to the openness of amateur radio, as well as usage restriction for being 'undisclosed digital code' under and similar national legislation. The digital voice and data protocol uses the AMBE+2 codec. Is implemented by Icom in the IDAS system and by Kenwood as NEXEDGE. Phase 2 trunked radio systems also use the AMBE+2 codec, while Phase 1 radios use the earlier IMBE codec.

(DMR) and Motorola's MOTOTRBO use the AMBE+2 codec. Licensing [ ] Use of the AMBE standard requires a license from Digital Voice Systems, Inc. While a licensing fee is due for most codecs, DVSI does not disclose software licensing terms. Anecdotal evidence [ ] suggests that licensing fee begin from between $100,000 to $1 million.

For purposes of comparison, licensing fees for use of the standard started at $15,000. For small-scale use and prototyping, the only option is to purchase a dedicated hardware IC from DVSI. [ ] DSP Innovations Inc.