88 lines
3.1 KiB
Groff
88 lines
3.1 KiB
Groff
.\" $NetBSD: sf2r.4,v 1.6 2020/08/24 19:25:57 ryoon Exp $
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.\" $RuOBSD: sf2r.4,v 1.3 2001/10/26 05:38:44 form Exp $
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.\" $OpenBSD: sf2r.4,v 1.2 2001/12/05 11:27:44 mickey Exp $
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.\"
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.\" Copyright (c) 2001 Vladimir Popov
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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.\" ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 25, 2020
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.Dt SF2R 4
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.Os
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.Sh NAME
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.Nm sf2r
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.Nd SoundForte RadioLink SF16-FMR2 FM radio device driver
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.Sh SYNOPSIS
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.Cd option RADIO_TEA5759
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.Pp
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.Cd "sf2r0 at isa? port 0x384"
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.Cd "radio* at sf2r0"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the SF16-FMR2 FM radio tuners.
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.Pp
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The SF16-FMR2 is a stereo FM tuner that allows to tune in the range
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87.5 - 108.0 MHz, report signal status on the current frequency, force
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audio output to mono, perform hardware signal search, and has an internal
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AFC.
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.Pp
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The SF16-FMR2 cards take only one I/O port.
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The I/O port is set by the driver to the value specified in the configuration
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file and must be 0x384.
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.Pp
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Philips Semiconductors released two almost identical chips TEA5757 and
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TEA5759.
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The TEA5757 is used in FM-standards in which the local oscillator frequency
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is above the radio frequency (e.g. European and American standards).
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The TEA5759 is the version in which the oscillator frequency is below
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the radio frequency (e.g. Japanese standards).
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The option
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.Va RADIO_TEA5759
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changes the algorithm of frequency calculation for the TEA5757 based cards
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to conform with the Japanese standards.
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.Sh SEE ALSO
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.Xr isa 4 ,
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.Xr radio 4
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.Sh HISTORY
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The
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.Nm
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device driver appeared in
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.Ox 3.0
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and
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.Nx 1.6 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Vladimir Popov
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and
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.An Maxim Tsyplakov.
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The man page was written by
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.An Vladimir Popov .
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.Sh BUGS
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MediaForte made two variants of the SF16-FMR2 cards, the first one has
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an internal amplifier of the output sound, the second one does not have
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such an amplifier.
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The current driver supports only the second variant.
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