Tentang File GSM

GSM (GSM Audio · Format Audio)

Dirilis 1987 Oleh ETSI (GSM consortium)

GSM Audio (.gsm) adalah format file standar yang didukung penuh oleh KaijuConverter untuk pertukaran data, pengarsipan, dan konversi lintas platform.

Keluarga

Audio Files

Ekstensi

.gsm

Tipe MIME

audio/gsm

Dapat Digunakan Sebagai

Input Output

Kisahnya

BAGAIMANA GSM
TERCIPTA.

1987

1991

2010

GSM — Global System for Mobile communications — standardized voice over digital cellular networks in 1987 in Europe. The codec specified for GSM calls compressed 8 kHz PCM speech into 13 kbps bitstream using Regular Pulse Excitation Long-Term Prediction (RPE-LTP). That was 6 kbps less than a typical landline call and shockingly better-sounding than anyone expected for the time. Every GSM phone on Earth — the 2G networks that spread from Europe to global coverage between 1991 and 2010 — decoded this codec continuously.

Standalone .gsm files preserve recorded calls in that same 13 kbps format. A minute of voice is about 100 KB. The extension appears mostly in corporate voicemail exports, old call-center archives, and some PBX recording systems. Newer LTE and VoLTE networks use Opus or EVS, but GSM’s codec survives in billions of 2G recordings and in the lo-fi-voice aesthetic of early-2000s phone memos.

FAKTA UNIK &
TRIVIA.

The GSM codec compressed voice at 13 kbps — good enough for 4 billion subscribers by the time 2G peaked around 2010.

Finland's Nokia and Sweden's Ericsson built most of the first-generation GSM infrastructure — Europe's telecom standard went worldwide.

GSM audio at 8 kHz is deliberately mono and speech-only — trying to play music through GSM sounds notoriously awful.

Call-center PBXes often saved customer call recordings as .gsm for decades because the bitrate was so small.

Every iPhone can still encode audio as GSM 6.10 — a vestige of the codec's universal embedded-device presence.

KEUNGGULAN &
KETERBATASAN.

Keunggulan

Tiny bitrate (13 kbps) — hours of speech in a few MB.
Speech-optimized — clear voice reproduction.
Universal cellphone decoder adoption 1991-2015.
Stable since 1987.

Keterbatasan

Speech-only — music sounds distorted.
8 kHz sampling — narrowband, muffled by modern standards.
Legacy — LTE VoLTE moved to AMR-WB, Opus, or EVS.
Tooling outside telecom is sparse.

Ukuran & Bobot Umum

1 min of voice

~100 KB

1 hour voicemail archive

~6 MB

Spesifikasi Teknis

MIME type: audio/gsm
Extension: .gsm
Codec: GSM 06.10 (RPE-LTP)
Sample rate: 8 kHz
Bitrate: 13 kbps

KONVERSI DARI
GSM

gsm mp3 gsm wav gsm flac gsm aac gsm m4a gsm ogg gsm opus gsm wma gsm aiff gsm aif gsm voc gsm w64 gsm shn gsm sox gsm snd gsm 8svx gsm tta gsm wv gsm spx gsm mp2 gsm dsf gsm dff

KONVERSI KE
GSM

mp3 gsm wav gsm flac gsm aac gsm m4a gsm ogg gsm opus gsm aif gsm voc gsm w64 gsm shn gsm sox gsm snd gsm 8svx gsm tta gsm wv gsm spx gsm mp2 gsm dsf gsm dff gsm

Kasus Penggunaan Umum

Voice over cellular, telephony systems, low-bandwidth speech encoding