In article om,
SFTV_troy wrote:

RHF wrote:
On Oct 12, 8:52 am, SFTV_troy wrote:
RHF wrote:
On Oct 11, 5:48 am, SFTV_troy

- There's no real difference between DRM's version
- (sitting next-to the AM signal) and HD's version
- (also sitting next-to the AM signal).

IBOC AM/MW "HD" Radio - Hybrid Mode
http://www.dallas.net/~jvpoll/rfi/AM...BOC_Mask10.gif
- Lower Digital Sidebands {Co-SideBand}
* Analog Host Signal (Mono) {Nested}
+ Upper Digital Sidebands {Co-SideBand}

- Thanks for proving my point. HD sits *next to* the AM signal (+/-

- 10 kHz). Same as DRM sits *next to* the AM signal (+/- 10 kHz).



DRM = Simulcast without Specification {Sans-Mask}
x x x Does Not Equal x x x
IBOC = Intrinsic {Mask} : Nested Analog + Two Digital Co-Sidebands



I still don't see the difference. Both standards are using sidebands,
adjacent to the analog AM signal.

Ok, here is a difference you should understand. DRM uses two separate
transmitters and antennas one digital and one analog. HD uses two
different exciters one digital and the other analog that input into the
same transmitter and antenna at the same time.

--
Telamon
Ventura, California

On Oct 13, 9:13 am, SFTV_troy wrote:
RHF wrote:
On Oct 12, 8:52 am, SFTV_troy wrote:
RHF wrote:
On Oct 11, 5:48 am, SFTV_troy

- There's no real difference between DRM's version
- (sitting next-to the AM signal) and HD's version
- (also sitting next-to the AM signal).

IBOC AM/MW "HD" Radio - Hybrid Mode
http://www.dallas.net/~jvpoll/rfi/AM...BOC_Mask10.gif
- Lower Digital Sidebands {Co-SideBand}
* Analog Host Signal (Mono) {Nested}
+ Upper Digital Sidebands {Co-SideBand}

- Thanks for proving my point. HD sits *next to* the AM signal (+/-

- 10 kHz). Same as DRM sits *next to* the AM signal (+/- 10 kHz).

DRM = Simulcast without Specification {Sans-Mask}
x x x Does Not Equal x x x
IBOC = Intrinsic {Mask} : Nested Analog + Two Digital Co-Sidebands

I still don't see the difference. Both standards are using sidebands,
adjacent to the analog AM signal.- Hide quoted text -

- Show quoted text -

SFTV - There you go again one more time being Factually Wrong
-and- Clearly Misstating the Technical Specifications.

DRM = Simulcast without Specification {Sans-Mask}
-Note- That is Two 'separate' Signals -NOT- Sidebands
x x x Does Not Equal x x x
IBOC = Intrinsic {Mask} : Nested Analog + Two Digital Co-Sidebands
http://electronicdesign.com/Files/29.../Figure_02.gif


i b oc'd ~ RHF

On Oct 13, 9:13 am, SFTV_troy wrote:
RHF wrote:
On Oct 12, 8:52 am, SFTV_troy wrote:
RHF wrote:
On Oct 11, 5:48 am, SFTV_troy

- There's no real difference between DRM's version
- (sitting next-to the AM signal) and HD's version
- (also sitting next-to the AM signal).

IBOC AM/MW "HD" Radio - Hybrid Mode
http://www.dallas.net/~jvpoll/rfi/AM...BOC_Mask10.gif
- Lower Digital Sidebands {Co-SideBand}
* Analog Host Signal (Mono) {Nested}
+ Upper Digital Sidebands {Co-SideBand}

- Thanks for proving my point. HD sits *next to* the AM signal (+/-

- 10 kHz). Same as DRM sits *next to* the AM signal (+/- 10 kHz).

DRM = Simulcast without Specification {Sans-Mask}
x x x Does Not Equal x x x
IBOC = Intrinsic {Mask} : Nested Analog + Two Digital Co-Sidebands


= I still don't see the difference. Both standards are using
sidebands,
= adjacent to the analog AM signal.

SFTV - There you go again one more time being Factually Wrong
-and- Clearly Misstating the Technical Specifications.

DRM = Simulcast without Specification {Sans-Mask}
-Note- That is Two 'separate' Signals -NOT- Sidebands
x x x Does Not Equal x x x
IBOC = Intrinsic {Mask} : Nested Analog + Two Digital Co-Sidebands
http://electronicdesign.com/Files/29.../Figure_02.gif


i b oc'd ~ RHF

Don Pearce wrote:
On Sat, 13 Oct 2007 10:05:11 -0700, "David Eduardo"
"SFTV_troy"


I still don't see the difference. Both standards are using
sidebands, adjacent to the analog AM signal.

DRM is not using a sideband; to do analog and digital requires a separate
transmitter for each on a separate carrier frequency. HD is a combined
analog and digital signal on the same carrier frequency. DRM is digital
only... if you want analog, you have to have a separate channel, close to or
not to the DRM one.


Exactly. DRM is a separate signal that can go wherever the operator
chooses. ..... It is not a sideband of the AM.
HD, on the other hand is an actual sideband of the AM carrier.




I see your point, but that seems a trivial difference. Especially
since HD also uses a separate signal (exciter), separate from the
analog signal. "As with AM, FM stations may use separate exciters to
modulate the very different signals." - wikipedia.

Sounds like simulcast of two signals.

Not just one.

On Oct 13, 2:50 pm, Telamon
wrote:

Ok, here is a difference you should understand. DRM uses two separate
transmitters and antennas one digital and one analog. HD uses two
different exciters one digital and the other analog that input into the
same transmitter and antenna at the same time.



Why does DRM have to use two separate antennas? Why can't DRM use a
combiner and output both signals through a single antenna?

On Mon, 15 Oct 2007 07:20:19 -0700, SFTV_troy
wrote:


Don Pearce wrote:
On Sat, 13 Oct 2007 10:05:11 -0700, "David Eduardo"
"SFTV_troy"


I still don't see the difference. Both standards are using
sidebands, adjacent to the analog AM signal.

DRM is not using a sideband; to do analog and digital requires a separate
transmitter for each on a separate carrier frequency. HD is a combined
analog and digital signal on the same carrier frequency. DRM is digital
only... if you want analog, you have to have a separate channel, close to or
not to the DRM one.


Exactly. DRM is a separate signal that can go wherever the operator
chooses. ..... It is not a sideband of the AM.
HD, on the other hand is an actual sideband of the AM carrier.




I see your point, but that seems a trivial difference. Especially
since HD also uses a separate signal (exciter), separate from the
analog signal. "As with AM, FM stations may use separate exciters to
modulate the very different signals." - wikipedia.

Sounds like simulcast of two signals.

Not just one.

An exciter is simply a source of a signal which can be modulated onto
a carrier.

If you want an analogy, HD is a little like the stereo subcarrier on
an FM signal - not the same as the baseband signal, but an integral
part of the overall signal. DRM would be like transmitting the stereo
signal on another channel entirely, with its own transmitter.

The difference is far from trivial.

d

--
Pearce Consulting
http://www.pearce.uk.com

"SFTV_troy" wrote in message
ups.com...

Don Pearce wrote:
On Sat, 13 Oct 2007 10:05:11 -0700, "David Eduardo"
"SFTV_troy"


I still don't see the difference. Both standards are using
sidebands, adjacent to the analog AM signal.

DRM is not using a sideband; to do analog and digital requires a
separate
transmitter for each on a separate carrier frequency. HD is a combined
analog and digital signal on the same carrier frequency. DRM is digital
only... if you want analog, you have to have a separate channel, close
to or
not to the DRM one.


Exactly. DRM is a separate signal that can go wherever the operator
chooses. ..... It is not a sideband of the AM.
HD, on the other hand is an actual sideband of the AM carrier.




I see your point, but that seems a trivial difference. Especially
since HD also uses a separate signal (exciter), separate from the
analog signal. "As with AM, FM stations may use separate exciters to
modulate the very different signals." - wikipedia.

On the same carrier for HD, on separate carriers for DRM. DRM is a pure
digital system, and if analog is also employed, it is on a separate
allocation, close or not so close to the digital frequency.

"SFTV_troy" wrote in message
oups.com...
On Oct 13, 2:50 pm, Telamon
wrote:

Ok, here is a difference you should understand. DRM uses two separate
transmitters and antennas one digital and one analog. HD uses two
different exciters one digital and the other analog that input into the
same transmitter and antenna at the same time.



Why does DRM have to use two separate antennas? Why can't DRM use a
combiner and output both signals through a single antenna?

Because the carrier frequencies are different... and because there is no
analog component to DRM... to do analog requires a separate station,
license, frequency.

"SFTV_troy" wrote in message
ups.com...

Don Pearce wrote:
On Sat, 13 Oct 2007 10:05:11 -0700, "David Eduardo"
"SFTV_troy"


I still don't see the difference. Both standards are using
sidebands, adjacent to the analog AM signal.

DRM is not using a sideband; to do analog and digital requires a
separate
transmitter for each on a separate carrier frequency. HD is a combined
analog and digital signal on the same carrier frequency. DRM is digital
only... if you want analog, you have to have a separate channel, close
to or
not to the DRM one.


Exactly. DRM is a separate signal that can go wherever the operator
chooses. ..... It is not a sideband of the AM.
HD, on the other hand is an actual sideband of the AM carrier.




I see your point, but that seems a trivial difference. Especially
since HD also uses a separate signal (exciter), separate from the
analog signal. "As with AM, FM stations may use separate exciters to
modulate the very different signals." - wikipedia.

Sounds like simulcast of two signals.

Not just one.

"SFTV_troy" wrote in message
ups.com...



I see your point, but that seems a trivial difference. Especially
since HD also uses a separate signal (exciter), separate from the
analog signal. "As with AM, FM stations may use separate exciters to
modulate the very different signals." - wikipedia.

Sounds like simulcast of two signals.

Not just one.



IBOC was engineered from the get-go with compatible recievers in mind. The
receivers would autoswitch from the analog to the digital signal.

Was DRM engineered with such autoswitching receivers in mind?

Are any such autoswitching receivers currently available?

Frank Dresser