Category Archives: Digital Modes

Chorus 4: The DSP chip that supports AM, FM, DAB, DAB+, HD Radio and DRM

FrontierSiliconThe London-based digital solutions company, Frontier Silicon, has announced a new DSP radio chip that offers a wide array of available modes and is even DRM ready.

I have seen no specifications for this chip yet, and do not know if it covers the shortwave radio spectrum.

Still, this might be the perfect chip to allow radio manufactures to design an inexpensive, fully digital product in countries where digital platforms are gaining strength (anywhere from the UK to India, for example).

Many thanks to Rob De Santos for apprising me of this. I’ll post the specifications when they become available. Read the full press release below:


(Source: Frontier Silicon Press Release)

Chorus 4 a single-chip solution, integrating four previously separate chips

London, 17th December 2013

Frontier Silicon announces details of Chorus 4, its next generation digital radio chip. Chorus 4 is a single-chip solution, which integrates four previously separate chips to deliver significant cost and energy consumption savings.

Chorus 4 is the fourth generation chip from Frontier Silicon. The chip is designed to encourage the continued advance of digital radio around the world by supporting all major global digital radio standards. Chorus 4 provides solutions for multiple devices, including consumer radios, the automotive aftermarket and, for the first time, smartphones and tablets. The company’s previous solutions have already powered over 20 million digital radios worldwide.

The key features and benefits of Chorus 4 are:

  • Low cost, single chip solution: integration of RF front-end, baseband, application processor and DAC (“four chips in one”) delivers significant cost savings which enable high quality, entry-level price point digital radios
  • Ultra-low power consumption – one month’s listening for 5-6 hours a day on a portable radio with four D cell batteries (comparable to FM performance)
  • Multiple solutions for portable and table-top radios, smart-device docks, wireless speakers, hand-held receivers, sound-bars and audio systems
  • Automotive aftermarket – solutions for head units, integrated convertors and low cost adapters
  • Smart devices – enables digital radio solutions for mobile phones and tablets
  • Bluetooth connectivity – connecting smart devices and digital radios to enable hybrid radio (with interactivity and additional content delivered via IP), music streaming and remote control
  • Integrated service guides – new software will enable listeners to select stations from a single list of digital and analogue stations regardless of platform
  • Multiple radio standards – including support for AM, FM, DAB, DAB+, HD Radio and DRM

Digital Tick compliant – Chorus 4 solutions meet all technology requirements of the UK minimum specifications for both domestic and automotive digital radio devices.
Frontier Silicon CEO, Anthony Sethill, said

“Chorus 4 represents a step change for the digital radio market. After ten years of development on this and previous solutions, we now have our fourth generation chip – an integrated, single chip offering enhanced functionality, lower cost and significantly greater energy efficiency. Chorus 4 will power multiple devices, including low cost automotive adapters and devices with Bluetooth connectivity. For the first time, digital radio in mass deployment smartphones will become a viable proposition. As a multi-standard chip, Chorus 4 will address emerging opportunities around the world. I look forward to working closely with broadcasters, transmission operators and device manufacturing partners to address these exciting opportunities.”

About Frontier Silicon Limited

Frontier Silicon is the world’s leading supplier of integrated circuits and modules for digital radio and connected audio products. Frontier Silicon is part of the Toumaz Group, a pioneer in low-power wireless semiconductor and software technologies for the consumer audio and wireless healthcare markets.

The group is headquartered in London, England, with design centres in Oxford, Cambridge, Hong Kong and Romania. The company also has sales and technical support teams in Hong Kong, China and Japan.

Frontier Silicon’s audio products offer solutions for DAB/DAB+, Internet radio and connected audio – from silicon through software to production-ready platform designs.

Customers supplied by Frontier Silicon include Argon, Bang & Olufsen, Bose, Bush, Denon, Dual, Geneva, Goodmans, Grundig, Hama, harman/kardon, Hitachi, JVC, Magic Box, NAD, Onkyo, Panasonic, Philips, Pinell, Pioneer, Pure, Revo, Roberts, Ruark Audio, Sangean, Sanyo, Sharp, Sony, TEAC, TechniSat, Tivoli Audio and Yamaha.

Frontier Silicon is a trademark or registered trademark of Frontier Silicon Ltd.

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All India Radio publishes a tender for 800 DRM receivers

drmlogoThe DRM Consortium has posted an All India Radio (AIR) tender for 800 DRM AM/FM/Shortwave receivers.

AIR is seeking a DRM receiver with a feature set that would include:

  • DRM decoding on both shortwave and medium wave (AM broadcast) bands
  • 1 kHz tuning increments on DRM bands (with DRM auto lock)
  • Stereo speakers and headphone jack
  • Four line mono/color digital display
  • Built-in stereo recording of DRM broadcasts–including a scheduling feature
  • Upgradable firmware
  • Built-in rechargeable battery pack with 6 hour playback time

There are more specs/features, of course–click here or here to download a scanned copy of the actual AIR tender.

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VOA Radiogram this weekend includes Greek and images in MFSK64 and 128

VOARadioGram(Source: VOA Radiogram)

VOA Radiogram for the weekend of 21-22 September 2013 is produced using Fldigi3.21.76AB. For best results, use this version, available from www.w1hkj.com/alpha/fldigi/v3.21/

One improvement in 3.21.76AB is that it can send images in MFSK64 and MFSK128. Previously, MFSK32 was the fastest MFSK mode for sending images without the pictures appearing skewed (off center). Images do not transmit more quickly in MFSK64 and MFSK128, but they do have higher resolution.

If your decoded MFSK64 and MFSK128 images are still slanted or skewed, calibration of the receive codec might be helpful. One such method for doing this is described here: www.w1hkj.com/FldigiHelp-3.21/DigiWWV.html.

Our non-Latin alphabet of the week is Greek. You will need the UTF-8 character set for the Greek and for some of the punctuation in the English items. I forgot to change some of the typographic apostrophes ’ to typewriter apostrophes ’ , so they will not display correctly if you do not have the UTF-8 character set. In Fldigi, that adjustment is made in Configure > Colors & Fonts.

This weekend’s program includes an English VOA News item in Flmsg format. When all the text is received, the story will render, or pop up, as a new web page on your browser, suitable for saving or forwarding. To make Flmsg work with Fldigi (both can be downloaded from w1hkj.com), in Fldigi: Configure > Misc > NBEMS — Under Reception of flmsg files, check both boxes, and under that indicate where your Flmsg.exe file is located.

Much of the show this weekend is in the MFSK64 mode, which might be a bit optimistic if reception conditions are less than ideal.

Here is the lineup of modes for VOA Radiogram, 21-22 September 2013:

2:53 MFSK16: Program preview
2:40 MFSK32: Sample of Greek text
:49 MFSK32 image: VOA Greek Service logo
3:01 MFSK32: “Need to Protect the Internet”
1:45 MFSK64: Radio Free Sarawak/Discovery Channel
2:23 MFSK64 image: “Duck Commander”
:27 MFSK128: CNBC Saracens deal
:48 MFSK128 image: CNBC logo
:45 MFSK32: E-mail address
4:40 MFSK64: BBC Worldwide, Giglio TV, Voice of Greece, All India Radio
2:55 MFSK64/Flmsg: VOA News re Voyager Golden Record
2:17 MFSK32 image: Voyager Golden Record
:33 MFSK32: Closing announcements

VOA Radiogram transmission schedule
(all days and times UTC)
Sat 1600-1630 17860 kHz
Sun 0230-0300 5745 kHz
Sun 1300-1330 6095 kHz
Sun 1930-2000 15670 kHz
All via the Edward R. Murrow transmitting station in North Carolina.

Please send reception reports to [email protected]

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DRM Test Transmission from PCJ International

drmlogoOn October 13, 2013 PCJ Radio International will conduct a two hour DRM test transmission.

Date: October 13, 2013

Time: 10:30 to 12:30 UTC

Frequency: 15,645 khz

Beam: South East & East Asia

Send your reception reports for this transmission to [email protected]

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VOA Radiogram 31 August/1 September 2013 includes Vietnamese and Russian

VOARadioGram(Source: VOA Radiogram)

This weekend’s VOA Radiogram will include sample text in Vietnamese and Russian. Vietnamese has all sorts of diacritics, and Russian uses a Cyrillic alphabet, so this will be a real workout for your decoding software. Your character set should be UTF-8. In Fldigi, this adjustment is via Configure > Colors & Fonts.

The program will also attempt to improve the performance of RSID (Reed-Solomon Identification), the brief signal at the beginning of a digital mode transmission that automatically switches decoding software to the correct mode and audio frequency. I produced the program using Fldigi 3.21.74AB. You will need Fldigi 3.21.73 or newer for the MFSK64 and MFSK128 RSIDs to work correctly. If you have a previous version of Fldigi, or another decoding software, I have provided time for the mode to be changed manually.

Here is the lineup for VOA Radiogram, 31 August/September 1 2013:

2:55  MFSK16: Program preview

3:10  MFSK32: Vietnamese and Russian text samples

2:58  MFSK32: Discussion of RSIDs

1:50  MFSK64/Flmsg: VOA News re dung beetles*

:56  MFSK32: Image of dung beetle

3:07  MFSK128/Flmsg/Base64: VOA blue logo*

2:16  MFSK64: VOA News re China hack attack

2:38  MFSK32: VOA Khmer radio photo contest

2:31  MFSK32: Image of submitted radio photo

1:10  MFSK16: Closing announcements

:15  Surprise mode of the week

*To make Flmsg work with Fldigi, in Fldigi: Configure > Misc > NBEMS, under Reception of flmsg files, check both boxes, and under that indicate where your Flmsg.exe file is located.

VOA Radiogram transmission schedule

(all days and times UTC)

Sat 1600-1630 17860 kHz

Sun 0230-0300 5745 kHz

Sun 1300-1330 6095 kHz

Sun 1930-2000 15670 kHz

All via the Edward R. Murrow transmitting station in North Carolina.

Please send reception reports to radiogram (at) voanews.com

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