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GSM surveillance - Detective store
https://www.detective-store.com/gsm-listening-devices-122
The main advantage of the GSM audio bug GF-07 is its small size of 90x60x6 millimetres. It is therefore very easy to conceal. You need to insert an active SIM card in the device for the eavesdropper to be ready for operation. The built-in sensitive microphone picks up sounds at a distance of 5-6 metres and transmits them using a phone call.
GSM Audio Converter - How to Convert GSM to MP3, …
https://www.faasoft.com/articles/gsm-player-converter.html
Step 1 Load GSM file to the GSM Converter Click "Add File" button on the interface to load GSM file to the program. Or just drag and drop your file to it. Step 2 Specify MP3 as the output format Click the drop-down button beside "Profile" to select "MP3 MPEG Layer-3 Audio (*.mp3)" as the output format from "General Audio" category.
GSM - Wikipedia
https://en.wikipedia.org/wiki/GSM
GSM has used a variety of voice codecs to squeeze 3.1 kHz audio into between 7 and 13 kbit/s. Originally, two codecs, named after the types of data channel they were allocated, were used, called Half Rate (6.5 kbit/s) and Full Rate (13 kbit/s).
GSM Converter and Player - Convert GSM to MP3 for …
http://www.bigasoft.com/articles/gsm-converter.html
Step 1 Load GSM audio Click Add File and browse to choose the GSM file which you want to convert. If all the GSM audio files are saved in one folder, just batch load them by Add File > Add File Folder. Step 2 Choose MP3 as output format MP3 is widely used on both Windows and Mac and fully compatible with most portable media devices.
GSM to MP3 (Online & Free) - Convertio
https://convertio.co/gsm-mp3/
A lossy format for compressing speech which is used in the Global Standard for Mobile telecommunications (GSM). It’s good for its purpose, shrinking audio data size, but it will introduce lots of noise when a given audio signal is encoded and decoded multiple times. This format is used by some voice mail applications. It is rather CPU intensive.
GSM Audio Codec: Vocoder: AMR, CELP etc .. » …
https://www.electronics-notes.com/articles/connectivity/2g-gsm/audio-codecs-vocoders-amr-celp.php
GSM Audio Codec / Vocoder Audio / voice codecs and vocoders convert the voice signals required to be transmitted over a GSM link into a compact digital format. Voice codec technologies used with GSM include LPC-RPE, EFR, Full Rate, Half Rate, AMR codec and AMR-WB codec & CELP, ACELP, VSELP, speech codec technologies. GSM primer includes:
Gsm Audio - CNET Download
https://download.cnet.com/s/gsm-audio/
SMSCaster E-Marketer GSM Standard GOM Audio Free Play music from CDs and other formats at high quality. Windows GOM Audio Acoustica MP3 Audio Mixer Free to try Edit your tunes or …
Convert MP3 to GSM online for free - AnyConv
https://anyconv.com/mp3-to-gsm-converter/
Upload MP3-file Click "Choose File" button to select a mp3 file on your computer. MP3 file size can be up to 100 Mb. Convert MP3 to GSM Click "Convert" button to start conversion. Download your GSM When the conversion process is complete, you can download the GSM file. MP3 converter MP3 to AAC MP3 to AIFF MP3 to AMR MP3 to AU MP3 to AVI MP3 to CAF
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