decrecord.1

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.\" Copyright (c) 1996 Entropic Research Laboratory, Inc.; All rights reserved
.\" @(#)decrecord.1	1.3 11/20/96 
.TH DECRECORD 1\-ESPS 11/20/96
.ds ]W "\fI\s+4\ze\h'0.05'e\s-4\v'-0.4m'\fP\(*p\v'0.4m'\ Entropic Research Lab., Inc.
.SH NAME
decrecord - mono or stereo record to disk
.PP
.SH SYNOPSIS
.B decrecord
[
.BI \-s " duration_to_record"
] [
.BI \-f " sample_rate"
] [
.BI \-c " number_of_channels"
] [
.BI \-S
] [
.BI \-P
] 
.I filename
.PP
.SH DESCRIPTION
.PP
.PP
\fIdecrecord\fP provides mono or stereo sampling at selected rates up
to 
48kHz when
recording to local disk.  Direct recording onto network disks is often
feasible as well.  Output files have ESPS FEA_SD headers.
\fIDecrecord\fP has special adaptations that permit display of the
recorded
file in \fIxwaves\fP (see \-S option below).
.PP
This program is for the DEC Alpha with multimedia extensions. To be
more precise, the DEC utility audiorecord must exist, because
\fIdecrecord\fP(1-ESPS) is simply a wrapper around it. The DEC
supplied audio capabilities are typically in /usr/bin/mme.
.PP
Use the DEC tool "audiocontrol" in the DEC multimedia extensions kit
to set the input and output controls (level, balance, port).  
.SH OPTIONS
.PP
The following options are supported:
.TP
.BI \-s " duration" " [5]"
Specifies the maximum duration of the recording session in
seconds. Note that the record duration is specified as an integer, and
truncation of the value takes place if specified as a non-integer.
(That is, \fI\-s 1.9\fP gets interpreted as record for 1 second.)
.TP
.BI \-f " frequency" " [8000]"
Specifies the sampling frequency.  Only a limited set of sample rates
are available:
8000, 11025, 16000, 22050, 32000, 33075, 44100, and 48000.
Specifying a value other than one of these is an error.
.TP
.BI \-c " channel" " [1]"
By default \fIdecrecord\fP(1-ESPS) samples and stores single-channel data
from the left channel. Dual-channel (stereo) recording is selected by 
setting \fIchannel\fP
to 2.
When stereo recording
is selected channels 0 and 1 alternate in the file, with
channel 0 being first.  
.TP
.BI \-S
This option enable the \fIxwaves\fP (1-ESPS) "make" command via 
\fIsend_xwaves\fP (1-ESPS) after the
requested recording time has elapsed.
This permits immediate examination of the recorded passage using
\fIxwaves\fP (1-ESPS).
.TP
.BI \-P
This option enable shell prompting for the start of recording.
.PP
.SH ESPS PARAMETERS
.PP
The parameter file is not read.  
.PP
.SH ESPS COMMON
.PP
ESPS Common is not read or written.
.PP
.SH WARNINGS
.PP
decrecord does not work if another process has control of the audio
device, such as DECsound (decsound) or the VU meter of Audio Control.
You will get the following errors
.nf
    
    audiorecord: <error> Error opening Wave device
    audiorecord: <error> Unsupported wave format
.fi
.PP
The maximum rate over the network is unpredictable in general, but we
routinely achieve 16kHz stereo at Entropic Research Laboratory.  Of
course rate limitations due to network speed will be less severe for
single-channel recording.
.PP
.SH FILES
.PP
.SH BUGS
.PP
.PP
.SH SEE ALSO
.PP
\fIcopysd\fP(1\-\s-1ESPS\s+1), \fIdecplay\fP (1\-\s-1ESPS\s+1), \fIsfconvert\fP (1\-\s-1ESPS\s+1)
.PP
.SH AUTHOR
.PP
David Burton