October 13th 07, 07:14 PM
posted to rec.audio.tech,rec.audio.car,rec.radio.shortwave,ba.broadcast
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First recorded activity by RadioBanter: Jun 2006
Posts: 7,243
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DRM -Ain't- IBOC
David Eduardo wrote:
"SFTV_troy" wrote in message
ps.com...
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.
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.
Both = QRM
dxAce
Michigan
USA
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