Yamaha YMF7xx

Yamaha YMF7xx

Yamaha YMF7xx are audio contollers for personal computers. Chip marking for ISA bus cards ends at 719, and PCI begins from 720. Chips for PCI bus standalone adapters are marked like YMF7x4, while on-board or embedded solutions bear marking YMF7x0. YMF7x4 features semi-hardware XG MIDI synthesis with either 32- or 64-note polyphony, full-duplex playback and recording at any samplerate (internally upsampled to 48,000 Hz), external game controller and MIDI interface, and a legacy block for DOS application support.

YMF7xx chips were used in a lot of cheap (under $50) soundcards. Yet their performance was surprisingly good. The cards were usually equipped with good quality 18-bit Digital-to-Analogue Converters, providing low noise and harmonic distortion levels found in semi-professional hardware.

The XG synthesizer features not only basic XG System Level 1, but also part of MU-50 additions, and can reproduce most musical data previously programmed for the popular DB50XG daughterboard. The card shipped with a 2MB wavetable bank of 8-bit samples by default, which has to be loaded into system RAM during booting. Neither the resolution or content of the wavetable bank are hardware limitations. An user can load his own banks using [http://www.yohng.com/powerymf/ third-party tools] to further improve sound quality or completely change the set of instruments. As most other XG standard tone generators, YMF7x4 can switch itself into TG300B mode, which is an emulation of Roland GS standard in order to provide reasonable playback of musical data bearing GS logo.

Legacy support includes OPL3 FM synthesizer, Sound Blaster Pro (22 kHz 8-bit Stereo) emulation and MPU-401 compatible MIDI interface. In addition to OPL3, DOS applications running under Windows 98 can also use the XG tone generator.

All of these features are available using Yamaha VxD driver under Windows 98. WDM drivers for this operating system and later Windows 2000/XP provide unacceptable XG MIDI synthesis (General MIDI is somewhat O.K), and may lack important mixer controls, like separate Line-Out and 3D Wide (which should be turned off). There is no legacy mode under NT-based OSes.

The most advanced version is YMF754, featuring an 4 channel output. Most expensive and feature-packed soundcard on it is the XWave 6000. It has additional hardware chip to emulate 5.1 sound, and 6 channel amplifier (2W for each channel). It occupies two PCI slots.

----
* [http://www-old.alsa-project.org/alsa/ftp/manuals/yamaha/ymf724.pdf PDF document explaining technical details of YMF724]
* [http://www.yohng.com/powerymf/files/ymffaq.txt Frequently Asked Questions about YMF7x4] (Russian)
* [http://www.yohng.com/powerymf/ PowerYMF: a (discontinued) device driver tweaker meant for improving quality of MIDI synthesis]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Yamaha Corporation — Yamaha Logo de Yamaha Création 12 octobre 1887 Siège social Hamamatsu …   Wikipédia en Français

  • Yamaha XG — or just XG is an extension to the General MIDI standard, created by Yamaha. It is similar in purpose to Roland s GS Standard. Relative to General MIDI, XG increased the number of available instruments from 128 to over 600, and introduced a large… …   Wikipedia

  • Yamaha — Logo de Yamaha Création 12 octobre 1887 Siège social …   Wikipédia en Français

  • Yamaha YMF262 — (year 1994) The Yamaha YMF262, also known as the OPL3 (OPL is an acronym for FM Operator Type L), is an FM synthesis sound chip. It is an improved version of the Yamaha YM3812 (OPL2), adding the following features: twice as many channels (18… …   Wikipedia

  • Yamaha YM2612 — The YM2612, aka OPN2, is a six channel sound chip developed by Yamaha. It belongs to Yamaha s OPN family of FM synthesis chips used in several game and computer systems. Developed as a stripped down version of the YM2608, it lacks its larger… …   Wikipedia

  • Yamaha YM2414 — The YM2414, aka OPZ, is an eight channel sound chip developed by Yamaha. It was designed for use in high end MIDI synthesizers, specifically in Yamaha s DX11, YS200, TX81Z, the Korg Z3 guitar synthesizer, and as the 16 channel OPZII in the Yamaha …   Wikipedia

  • Yamaha YM3812 — An audio sample of music written for and played on YM3812 The Yamaha YM3812 also known as the OPL2 (OPL is an acronym for FM Operator Type L) is a sound chip (i.e. int …   Wikipedia

  • Yamaha YM2413 — The YM2413, aka OPLL, is a cost reduced FM synthesis sound chip manufactured by Yamaha Corporation and based on their YM3812 (OPL2). To make the chip cheaper to manufacture, many of the internal registers were removed. The result of this is that… …   Wikipedia

  • Yamaha YMF278 — The Yamaha YMF278B, also known as the OPL4 (OPL is an acronym for FM Operator Type L), is a sound chip that incorporates both sample based synthesis (often incorrectly called wavetable synthesis) and FM synthesis. Contents 1 Sample based… …   Wikipedia

  • Yamaha YM2610 — YM2610, aka OPNB, is a fifteen channel sound chip developed by Yamaha. It s a member of Yamaha s OPN family of FM synthesis chips, and related to the YM2608. It was most notably used in SNK s Neo Geo arcade and home game systems, along with other …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”