Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5F726380000B7; Sat, 12 Jan 2013 17:15:48 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Tu9LV-00041m-6C for rs_out_1@blacksheep.org; Sat, 12 Jan 2013 22:14:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Tu9LT-00041b-Vi for rsgb_lf_group@blacksheep.org; Sat, 12 Jan 2013 22:14:31 +0000 Received: from nm14-vm0.bullet.mail.ird.yahoo.com ([77.238.189.193]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Tu9LP-0006js-To for rsgb_lf_group@blacksheep.org; Sat, 12 Jan 2013 22:14:30 +0000 Received: from [77.238.189.48] by nm14.bullet.mail.ird.yahoo.com with NNFMP; 12 Jan 2013 22:14:07 -0000 Received: from [212.82.108.236] by tm1.bullet.mail.ird.yahoo.com with NNFMP; 12 Jan 2013 22:14:07 -0000 Received: from [127.0.0.1] by omp1001.mail.ird.yahoo.com with NNFMP; 12 Jan 2013 22:14:07 -0000 X-DKIM-Result: Domain=yahoo.co.uk Result=Good and Known Domain X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 200011.55266.bm@omp1001.mail.ird.yahoo.com Received: (qmail 15889 invoked by uid 60001); 12 Jan 2013 22:10:40 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1358028640; bh=vebgtUppYw0zt/OmQAwKBkC+iWtY/6poX29v1xb1KXE=; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=m3Ree7FAnBqftOyKtTdj6Qk+mBQ2DpS7fEWoDHEXUqC8VLhIoCM3e7EXBQLDBdHrmnZgsg70tBZ40xoWoLKGK0u4PdeK6+F1FBxlDaCc6+nHefWRBXnYysPGGaP+MEW+jCzEH/2pNZf63YYLzOLmsCE3XKnKETEsTQk00Gs2pCQ= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=bxrFgr5klNIi4DhkMc6DmSi93ZZaZ5d3ewzgl/URVoQN1LDgOwesTIb4x/+0+xLdWtyp5l0Mob7XEs3HdWj0tCZkDy9fde2sZASydSW4f/h8MM0StoVKuRADIQUg/FxvCV0zm2pfi8aX8D6wq/1xIyvApHiWKL6KMq9YMQrX2JM=; X-YMail-OSG: .XUy8WsVM1mIJ.r7PcP5IGemubYSOViUSZjrffiyS19E6_m _i9Lu_Ju.T7oqB0i5OSQmvlGCrAjfU5gmwreP55xJqOmsMeasElt6aurdsbm qVgN8.VA53f3Si9VXwcSHNmHea0LSERIDPBRLTZVP_slrr9G29XYdW.lzuEg GE9W4hjg7kX7jEgPcH5MXhPT01FQsRsDskZ01dN2LdOPYlUgf.yeD3ZYeCG0 I6wlRPVB9bXjc.vpYsC2.2zHuwwkzFUjO992i4Noa2mVsdBGICuu3JM3vlyT R.O2QFrA4XsW.yexUOUiJpSOqybseV19UKIAMzpwjC6OZRm.MgiGNCmFDEmt Mxz.Ek7XKlVPRSqxpENRDkXx.o2yZ4T4Bysh6eNWDZmIsrcFayBcPlVAM_kQ fz1y_qBgTQDjqZ3DLEdoW64qTmwl4THRqcO0vHFO0m.lNU1foEBNm.wJVjes C.C0CD_nZbkI2rFE_RfOKBQ4HErkjZqRblcFOGypi2hbyNNhDr.Xr86knSf9 Yzs8be7tvFsUpsK8jsGCngkfYtdOTQmoNFP9Nj.F6DpMAFS1.uYxJ.sZyc26 fZsM42UbJcOlhye6valOlIMKFE9o0gmaj8LK4EoLEl2CyePAMqRFnAD7N2ml ic8jAfQ-- Received: from [31.51.148.86] by web133205.mail.ir2.yahoo.com via HTTP; Sat, 12 Jan 2013 22:10:40 GMT X-Rocket-MIMEInfo: 001.001,T0sgTWFya3VzCsKgCkkgaGF2ZSBubyBwcm9ibGVtIHdpdGggdGhlIFR3ZW50ZSBTRFIgaXQgd29ya3MgZmluZSBoZXJlLiBBbmQgSSBoYXZlIG5vIHByb2JsZW0gd2l0aCBkZWNvZGluZyBmcm9tIHRoZSBhcHBsaWNhdGlvbi4KwqAKTXkgcHJvYmxlbSBpcywgSSBjYW4gbm90IHJ1biB0aGUgU2xvdyBWb2ljZSBzb2Z0d2FyZcKgb24gdGhpcyBQQyzCoGJ1dCBJIHdpbGwgdGFrZSBhIGZ1cnRoZXLCoGxvb2sgYXQgdGhlIGNvbXBhdGliaWxpeSBpc3N1ZXMuCsKgClBsZWFzZSByZXBvcnQgeW91ciB0ZXN0cyBoZXIBMAEBAQE- X-Mailer: YahooMailWebService/0.8.130.494 References: <871180718.807959.1357202851097.JavaMail.open-xchange@email.1und1.de> <8CFB7BD49F0E58C-6E8-60E@webmail-d164.sysops.aol.com> <4D45055C381D4BECA4B1BEF1254E1059@Black> <1751FF6A14644CC7A968E35A554BF7C4@Black> <1358002148.84705.YahooMailNeo@web133206.mail.ir2.yahoo.com> <1358010140.10914.YahooMailNeo@web133201.mail.ir2.yahoo.com> <700E13D8A5B74C31AB382F6E0EDECF4F@Black> Message-ID: <1358028640.842.YahooMailNeo@web133205.mail.ir2.yahoo.com> Date: Sat, 12 Jan 2013 22:10:40 +0000 (GMT) From: M0FMT To: "rsgb_lf_group@blacksheep.org" In-Reply-To: <700E13D8A5B74C31AB382F6E0EDECF4F@Black> MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: OK Markus  I have no problem with the Twente SDR it works fine here. And I have no problem with decoding from the application.  My problem is, I can not run the Slow Voice software on this PC, but I will take a further look at the compatibiliy issues.  Please report your tests here when you next run your set up. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [77.238.189.193 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 03611e5ac7d3498d5891f08d3655033a Subject: Re: LF: Slow Voice - testing on 137.0 kHz Content-Type: multipart/alternative; boundary="-1690458260-1648484363-1358028640=:842" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_FONT_BIG, HTML_MESSAGE,TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mtain-dg06.r1000.mx.aol.com ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d410e50f1e0935e5d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ---1690458260-1648484363-1358028640=:842 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable OK Markus=0A=C2=A0=0AI have no problem with the Twente SDR it works fine he= re. And I have no problem with decoding from the application.=0A=C2=A0=0AMy= problem is, I can not run the Slow Voice software=C2=A0on this PC,=C2=A0bu= t I will take a further=C2=A0look at the compatibiliy issues.=0A=C2=A0=0APl= ease report your tests here when you next run your set up.=0A=0A73 es GL Pe= te M0FMT IO91UX=0A=0A=0A>________________________________=0A> From: Markus = Vester =0A>To: rsgb_lf_group@blacksheep.org =0A>Sent:= Saturday, 12 January 2013, 17:35=0A>Subject: Re: LF: Slow Voice - testing = on 137.0 kHz=0A> =0A>=0A>=EF=BB=BF =0A>Pete, I don't=C2=A0about Win 7, but= the Twente =0Areception was processed here on=C2=A0a machine running 32 bi= t =0AVista. =0A>=0A>I've taken the=C2=A0test transmissions off air for toda= y. It=C2=A0had =0Abeen=C2=A0active 14:00 to 16:51, PEP=C2=A0some 400 mW ERP= . If there's interest I =0Acould continue tomorrow afternoon. =0A>=C2=A0 = =0A>Best 73, =0A>Markus (DF6NM) =0A>=C2=A0 =0A>=0A>----- Original Message -= ---- =0A>From: M0FMT =0A>To: rsgb_lf_group@blacksheep.org =0A>Sent: Satur= day, January 12, 2013 6:02 PM =0A>Subject: Re: LF: Slow Voice - testing on = 137.0 kHz =0A>=0A> =0A>Hi Markus =0A>=C2=A0 =0A>My PC 64bit so have compati= bility prob not resolved with your =0Asoftware. Win7 here and other machine= s Vista. =0A>=C2=A0 =0A>Too bad. =0A>=C2=A0 =0A>The recording sounds OK bit= like a telephone but usable. =0A>73 es GL Pete M0FMT IO91UX=0A> =0A>=0A>>= ________________________________=0A>>From: Markus Vester =0A>>To: rsgb_lf_group@blacksheep.org =0A>>Sent: Saturday, 12 January = 2013, 15:12=0A>>Subject: Re: LF: Slow Voice - testing on 137.0 kHz=0A>>=0A= >>=0A>>=EF=BB=BF =0A>>Thanks Pete for the feedback. I have uploaded=C2=A0a = .wma file of the 14:58 transmission received=C2=A0via Twente tohttp://www.d= f6nm.bplaced.net/slowvoice/ =0A>>=0A>>During the whole minute you can hear= the slow narrowband audio up around 3 kHz. At 40 seconds into the recordi= ng the replay starts, and=C2=A0my original voice=C2=A0becomes audible. =0A= >>=0A>>Best 73, =0A>>Markus (DF6NM) =0A>>=0A>> =0A>>=C2=A0 =0A>>=C2=A0 =0A= >>----- Original Message ----- =0A>>From: M0FMT =0A>>To: rsgb_lf_group@bl= acksheep.org =0A>>Sent: Saturday, January 12, 2013 3:49 PM =0A>>Subject: R= e: LF: Slow Voice - testing on 137.0 kHz =0A>>=0A>> =0A>>Well done Marcus a= nd co. =0A>>=C2=A0 =0A>>Thank you for your innovative contributions to Ham = Radio. Proving that even with current technology the limits can be pushed= further. =0A>>=C2=A0 =0A>>In the UK (and I am sure elsewhere) there is a s= ingle channel VHF=C2=A0Parrot type repeater which is operated in a similar= way where you speak, drop carrier, hear your own=C2=A0transmission rebroa= dcast and then wait for a reply which some times can be heard directly on = the channel and is then re-enforced by the Parrot in the following transmi= ssion. It is slow and laborious but many stations use it. =0A>>=C2=A0 =0A>= >I guess the difference is that you have an added element of delay=C2=A0ea= ch way for audio frequency com/decompression which amounts to the Parrot i= n the above case rebroadcasting each transmission only longer by a factor.= . =0A>>=C2=A0 =0A>>Like to hear an audo file?=0A>>=0A>> =0A>>73 es GL Pete = M0FMT IO91UX=0A>>=0A>>=0A>>>________________________________=0A>>>From: Mar= kus Vester =0A>>>To: rsgb_lf_group@blacksheep.org = =0A>>>Sent: Saturday, 12 January 2013, 14:03=0A>>>Subject: LF: Slow Voice= - testing on 137.0 kHz=0A>>>=0A>>>=0A>>>=EF=BB=BF =0A>>>Yesterday morning= I have uploaded a new version SlowVoice v0.2 tohttp://www.df6nm.bplaced.n= et/slowvoice/SlowVoice.zip =0A>>>I have reworked some details of the timing= , and added simplified scripts for receive-only and transmit-only in mono = mode. The serial port PTT control utility=C2=A0has also been=C2=A0modified= to=C2=A0function=C2=A0under WinXP. =0A>>>=C2=A0 =0A>>>This afternoon=C2= =A0I=C2=A0am sending=C2=A0a few slow voice tests with 3 times deceleration= in 1-minute frames. The=C2=A0800 Hz wide passband=C2=A0is centered on 137= .0 kHz, thus 136.6 to 137.4 kHz=C2=A0corresponds to 0.3 to 2.7 kHz audio.= =C2=A0Attached screenshot=C2=A0shows=C2=A0the narrow SSB signal on the Twe= nte WebSDR tuned=C2=A0to 135.5 kHz USB.=C2=A0I used a narrow passband=C2= =A0to improve=C2=A0rejection for DCF and HGA. This audio=C2=A0around fc=3D= 1500 Hz=C2=A0was fed=C2=A0to the receive-only utility, which then produce= d=C2=A0clear speech=C2=A0during 20 seconds of each=C2=A0minute.=C2=A0 =0A>= >>=0A>>>I intend to=C2=A0run some more test=C2=A0transmissions this afterno= on, starting now 14 UT. Any=C2=A0reports=C2=A0would be=C2=A0much appricia= ted! =0A>>>=0A>>>Best 73, =0A>>>Markus (DF6NM)=C2=A0=C2=A0 =0A>>>=0A>>>=C2= =A0 =0A>>>=C2=A0 =0A>>>----- Original Message ----- =0A>>>From: Markus Ves= ter =0A>>>To: rsgb_lf_group@blacksheep.org =0A>>>Sent: Tuesday, January 0= 8, 2013 11:31 PM =0A>>>Subject: LF: Slow Voice utility =0A>>>=0A>>> =0A>>>A= =C2=A0few minutes ago=C2=A0I have uploaded an experimental=C2=A0SlowVoice = script to =0A>>>http://www.df6nm.bplaced.net/slowvoice/SlowVoice.zip =0A>>>= =C2=A0 =0A>>>The main purpose is to be able to convey=C2=A0high quality sp= eech=C2=A0in less than 800 Hz on the RF side, as prescribed by German LF a= nd MF regulations.=C2=A0By default,=C2=A0an audio band of 300 to 2700 Hz i= s slowed by a factor of 3 and upconverted to 1500 Hz center frequency. Thu= s=C2=A0a range of 1200 to 2000 Hz=C2=A0is fed to the SSB=C2=A0transmitter.= As an aside benefit we get a very much welcome=C2=A05 dB improvement in S= NR. =0A>>>=C2=A0 =0A>>>Like JT9-1, the procedure is clock-synchronized in = fixed one-minute time slots. At the beginning of the minute, the transmitt= ing station is asked to speak for 20 seconds.=C2=A0It feels a bit like=C2= =A0to speaking to a telephone answering machine ;-) The=C2=A0slow converte= d output of the growing audio buffer begins to play immediately, and will = go on=C2=A0during the whole minute. On the receive side, fast replay begin= s at second number 40, and=C2=A0the shrinking buffer will finally be used = up by the end of the minute. =0A>>>=C2=A0 =0A>>>The SlowVoice.bat script is= set up for full duplex operation. One channel is supposed to handle the t= ransmit side (eg. mic connected to=C2=A0left input,=C2=A0transmitter to le= ft output), while the other channel has the receiver=C2=A0fed to=C2=A0the = input and phones on the output. This is symmetrical, and there is no furth= er need to switch audio pathways between TX and RX. It is also possible to= monitor=C2=A0the result of one's own transmission, eg. by=C2=A0physically= connecting left line out to right in. If you want you can use=C2=A0SpecLa= b=C2=A0in conjunction with=C2=A0Virtual Audio Cable to preprocess both the= =C2=A0mic and receiver audio inputs. In this case VAC will have to be sele= cted as the standard audio input device before the running the script. =0A= >>>=C2=A0 =0A>>>Whether a=C2=A0slots is used for=C2=A0TX or=C2=A0RX is not= controlled by the software but only by the user's PTT. I have included tw= o extra scripts which are supposed to activate the serial=C2=A0handshake l= ines (RTS and DTR) on either=C2=A0even or odd minutes. Unfortunately the= =C2=A0port control does not seem to work on my=C2=A0XP machine with an ext= ernal USB to serial converter, so for the time being you=C2=A0may have to = do=C2=A0with either=C2=A0vox control or manual=C2=A0switching. =0A>>>=C2= =A0 =0A>>>I haven't gotten around writing=C2=A0more detailed instructions,= but some basic hints have been included in the SlowVoice script. Similar = to the first slow WSPR experiments, the whole deceleration / acceleration = process is based on=C2=A0Wolf's sound utilities=C2=A0which you will need t= o download from=C2=A0the DL4YHF=C2=A0web site.=C2=A0You will have to run = the included patch utility once to duplicate SndInput and SndOutpt=C2=A0in= stances. =0A>>>=C2=A0 =0A>>>Have fun! And please report bugs and other tro= ubles. =0A>>>=C2=A0 =0A>>>73, Markus (DF6NM) =0A>>>=C2=A0 =0A>>>=C2=A0 =0A>= >>=C2=A0 =0A>>>=C2=A0 =0A>>>----- Original Message ----- =0A>>>From: Marku= s Vester =0A>>>To: rsgb_lf_group@blacksheep.org =0A>>>Sent: Sunday, Janua= ry 06, 2013 1:50 PM =0A>>>Subject: LF: Bandlimited SSB test on 136 kHz =0A>= >>=0A>>> =0A>>>... =0A>>>=C2=A0 =0A>>>Slow voice transmission=C2=A0(ie the= =C2=A0audio deceleration/acceleration method originally used by DK8KW and = myself) would be=C2=A0nicer as it can fit=C2=A0a full SSB channel into 800= Hz.=C2=A0I=C2=A0have been working on a=C2=A0semi-automatic control, with= =C2=A0a fixed one minute raster similar to JT9-1. This will hopefully allo= w us to comfortably exchange one 20 second voice message per time slot (sp= eak=C2=A0during seconds 0 to 20, concurrent transmit=C2=A0and=C2=A0receive= at 1/3 speed from 0 to 60, replay=C2=A0starting 40 to 60). Anyone interes= ted? =0A>>>=C2=A0 =0A>>>...=0A>>>=0A>>>=C2=A0carr =0A>>=0A>> =0A>=0A> ---1690458260-1648484363-1358028640=:842 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
OK Markus
 
I have no problem with the Twente= SDR it works fine here. And I have no problem with decoding from the appli= cation.
 
My problem is,= I can not run the Slow Voice software on this PC, but I will tak= e a further look at the compatibiliy issues.
 
Please report your tests here when you next run= your set up.
73 es GL Pete M0FMT IO91UX
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org <= br> Sent: Saturday, 12 Jan= uary 2013, 17:35
Subject:<= /b> Re: LF: Slow Voice - testing on 137.0 kHz

=EF=BB=BF=0A=0A =0A =0A
=0A
Pete, I don't about Win 7, but the Twente= =0Areception was processed here on a machine running 32 bit =0AVista.=
=0A
 
=0A
I've taken the test transmiss= ions off air for today. It had =0Abeen active 14:00 to 16:51, PEP=  some 400 mW ERP. If there's interest I =0Acould continue tomorrow aft= ernoon.
=0A
 
=0A
Best 73,=0A
Markus (DF6NM)
=0A 
=0A
 =0A
----- Original Message ----- =0A
From: M0FMT
=0A=0A
Sent: Saturday, J= anuary 12, 2013 6:02 PM
=0A
Subject: Re: LF: Slow Voice - t= esting on 137.0 kHz
=0A

=0A
=0A
Hi Markus
=0A=
 
=0A
My PC 64bit so have compatibility prob not resolve= d with your =0Asoftware. Win7 here and other machines Vista.
= =0A
 
=0A
Too bad.
=0A 
=0A
The recording sounds OK bit like a = telephone but usable.
=0A
=0A
73 es GL Pete M0FMT IO91UX
=0A
=0A<= blockquote style=3D"padding-left: 5px; margin-top: 5px; margin-left: 5px; b= order-left-color: rgb(16, 16, 255); border-left-width: 2px; border-left-sty= le: solid;">=0A
=0A
=0A
=0A
From: =0A Markus Vester <markusvest= er@aol.com>
To: = rsgb_lf_group@black= sheep.org =0A
Sent: Saturday, 12 January =0A 2013, 15:12
Subject: Re: LF: =0A Slow Voice - testing on 137.0 kHz

=0A =0A
=EF=BB=BF =0A
= =0A
Thanks Pete for the feedback. I have uploaded a .wma file of the 14:5= 8 transmission received via =0A Twente to
=0A
=0A =0A
=0A
 
=0A
During the whole minute you can hear the s= low narrowba= nd audio up around 3 kHz. At 40 seconds into the =0A recording the = replay starts, and my original voice becomes =0A audible.
= =0A
 
=0A
Best 73,
=0A
Markus (DF6NM)
=0A=
=0A
=0A
 
=0A
<= font size=3D"2" face=3D"Arial"> 
=0A
 
=0A
----- =0A Original Mes= sage ----- =0A
From:= M0FMT =0A =0A
Sent: Saturday, January 12, 2013 3:49 PM=0A
Subject: Re: LF: Slow Voice - testing on 137.0 kHz
=
=0A

=0A
=0A
Well done Marcus and co.
=0A  
=0A
Thank you for your innovative contributions to Ham= =0A Radio. Proving that even with current technology the limits can be =0A pushed further.<= /span>
=0A
 
=0A
In the UK (a= nd I am sure elsewhere) there is a single channel =0A VHF Parrot type= repeater which is operated in a similar way where you =0A speak, drop car= rier, hear your own transmission rebroadcast and then wait =0A for a = reply which some times can be heard directly on the channel and is then =0A= re-enforced by the Parrot in the following transmission. It is slow and = =0A laborious but many stations use it.
=0A
 
=0A
I guess the difference is that you have an add= ed element of =0A delay each way for audio frequency com/decompressio= n which amounts to the =0A Parrot in the above case rebroadcasting each transmission only =0A longer by = a factor..
=0A
 
=0A
L= ike to hear an audo file?

=0A
73 es GL Pete M0FMT= IO91UX
=0A
=0A
=0A
=0A
=0A
From: Markus Vester =0A <markusvester@aol.c= om>
To: rsgb_lf_grou= p@blacksheep.org =0A
Sent: Saturday, 12 January =0A 2013, 14:03
Subject: LF: =0A Slow Voice - testing on 137.0 = kHz

=0A
=EF=BB=BF =0A =0A=0A
=0A
Yesterday morning I =0A have uploaded a new= version SlowVoice v0.2 to
=0A =0A
I have reworked some details of the timing, and =0A add= ed simplified scripts for receive-only and transmit-only in mono mode. =0A = The serial port PTT control utility has also been modified =0A= to function under WinXP.
=0A
=0A
 
=0A
This afternoon I am sending = ;a few slow voice tests with =0A 3 times deceleration in 1-minute frames= . The 800 Hz wide =0A passband is centered on 137.0 kHz, thus = 136.6 to 137.4 =0A kHz corresponds to 0.3 to 2.7 kHz audio. At= tached =0A screenshot shows the narrow SSB signal on the Twent= e WebSDR =0A tuned to 135.5 kHz USB. I used a narrow passband&= nbsp;to =0A improve rejection for DCF and HGA. This audio arou= nd fc=3D1500 =0A Hz was fed to the receive-only utility, which= then =0A produced clear speech during 20 seconds of =0A ea= ch minute. 
=0A
 
=0A
I intend to&= nbsp;run some more test transmissions this afternoon, =0A starting = now 14 UT. Any reports would be much =0A appriciated!=0A
 
=0A
Best 73,
=0A
Markus (DF6= NM)  
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----- =0A = Original Message ----- =0A =0A =0A
Sent:= Tuesday, January 08, 2013 11:31 PM
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Subject: LF: Sl= ow Voice utility
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A few minutes ago I have uploaded an =0A= experimental SlowVoice script to
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T= he main purpose is to be able to =0A convey high quality speech&nbs= p;in less than 800 Hz on the RF side, as =0A prescribed by German LF and= MF regulations. By default, an audio =0A band of 300 to 2700 = Hz is slowed by a factor of 3 and upconverted to 1500 Hz =0A center freq= uency. Thus a range of 1200 to 2000 Hz is fed to the =0A SSB&n= bsp;transmitter. As an aside benefit we get a very much welcome 5 =0A = dB improvement in SNR.
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Like = JT9-1, the procedure is clock-synchronized =0A in fixed one-minute time = slots. At the beginning of the minute, the =0A transmitting station is a= sked to speak for 20 seconds. It feels a bit =0A like to speak= ing to a telephone answering machine ;-) The slow =0A converted out= put of the growing audio buffer begins to play immediately, and =0A will= go on during the whole minute. On the receive side, fast replay =0A = begins at second number 40, and the shrinking buffer will finally be= =0A used up by the end of the minute.
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The SlowVoice.bat script is set up for full =0A duplex operat= ion. One channel is supposed to handle the transmit side (eg. =0A mic co= nnected to left input, transmitter to left output), while =0A = the other channel has the receiver fed to the input and phones on= =0A the output. This is symmetrical, and there is no further need to sw= itch =0A audio pathways between TX and RX. It is also possible to monito= r the =0A result of one's own transmission, eg. by physically = connecting left =0A line out to right in. If you want you can use S= pecLab in =0A conjunction with Virtual Audio Cable to preproce= ss both the mic =0A and receiver audio inputs. In this case VAC wil= l have to be selected as the =0A standard audio input device before the = running the script.
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Whether a&n= bsp;slots is used for TX =0A or RX is not controlled by the so= ftware but only by the user's PTT. I =0A have included two extra scripts= which are supposed to activate the =0A serial handshake lines (RTS= and DTR) on either even or odd =0A minutes. Unfortunately the = ;port control does not seem to work on =0A my XP machine with an ex= ternal USB to serial converter, so for the time =0A being you may h= ave to do with either vox control or =0A manual switching= .
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I haven't gotten around writing more =0A detailed in= structions, but some basic hints have been included in the =0A SlowVoice= script. Similar to the first slow = =0A WSPR experiments, the whole deceleration / acceleration process is b= ased =0A on Wolf's sound utilities which you will need to down= load =0A from the DL4YHF web site. You will =0A have to run the included patch utility once to du= plicate SndInput and =0A SndOutpt instances.
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Have fun! And please report bug= s and other =0A troubles.
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7= 3, Markus (DF6NM)
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----- =0A Original Message ----- =0A =0A =0A
= Sent: Sunday, January 06, 2013 1:50 PM
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Subject:<= /b> LF: Bandlimited SSB test on 136 kHz
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Slow voice trans= mission (ie the audio =0A deceleration/acceleration method ori= ginally used by DK8KW and myself) would =0A be nicer as it can fit&= nbsp;a full SSB channel into 800 =0A Hz. I have been working o= n a semi-automatic control, =0A with a fixed one minute raster= similar to JT9-1. This will hopefully =0A allow us to comfortably excha= nge one 20 second voice message per time slot =0A (speak during sec= onds 0 to 20, concurrent =0A transmit and receive at 1/3 speed= from 0 to 60, =0A replay starting 40 to 60). Anyone interested?
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 carr
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