Bilingual and stereo sound television programs started being broadcast in Japan in October 1978 using a system developed by NHK Technical Research Labs. This system was modified and standardized by the EIAJ in January 1979.

The original version M TV standard has a monaural FM transmission at 4.5 MHz. For Japanese multichannel television sound a second channel, or sub-channel is added to the original signal by using an FM sub-carrier at twice the line frequency (Fh, or 15374 Hz). In order to identify the different modes (mono, stereo, or dual sound) a control tone is also added at 3.5 times the line frequency.

v • d • e Broadcast video formats Television Analog 525 lines NTSC · NTSC-J · PAL-M 625 lines PAL · PAL-N/NC · PALplus · SECAM Audio BTSC (MTS) · NICAM-728 · Zweiton (A2 / IGR) · EIAJ Hidden signals Captioning · Teletext · CGMS-A · GCR · PDC · VBI · VEIL · VITC · WSS · XDS Defunct systems Pre-1940 · 405 lines · 819 lines · Baird-Nipkow · MAC · MUSE Digital Interlaced SDTV (480i · 576i) · HDTV (1080i) Progressive LDTV (240p · 288p · 1seg) · EDTV (480p · 576p) · HDTV (720p · 1080p) MPEG-2 standards ATSC · DVB · ISDB · DMB-T/H MPEG-4 AVC standards DMB-T/H · DVB · SBTVD · ISDB (1seg) Audio AC3 (5.1) · MPEG Multichannel · PCM · LPCM · AAC Hidden signals Captioning · Teletext · CPCM · Broadcast flag · AFD · EPG Digital cinema UHDV (2540p · 4320p) · DCI Technical issues 14:9 compromise · MPEG transport · Reverse Standards Conversion · Standards conversion · Video processing · Video on demand · HDTV blur

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