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Raspberry Pi Forum How to improve the audio output for a (too) flat screen TV?
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How to improve the audio output for a (too) flat screen TV?

Former Member
Former Member over 11 years ago

Modern flat screens of digital TVs are getting shallower.
So there will be less and less room for speakers (LS) of sufficient quality.
One solution is to connect external LS to the TV.
But that requires an "AV receiver", which for example in a kitchen TV is overly expensive.
A cheaper solution might be possible with the RaspberryPi complemented by a Wolfson audio card? My question is how to achieve this? Does anyone have experience in this application?
By Consumer Electronics Control (CEC) along with HDMI ARC (Audio Return Signal) the TV remote will switch inputs, change channels, together with setting the audio volume.



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  • Robert Peter Oakes
    0 Robert Peter Oakes over 11 years ago

    Most "Kitchen" TV's also have a simple headphone Jack or Line out. This with a pair of powered Bose speakers will work just great. (Replace Bose with your brand of choice) and is a far simpler solution IMHO

     

    Or possibly an optical / SPDif output

     

    Peter

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  • Former Member
    0 Former Member over 11 years ago in reply to Robert Peter Oakes

    Thanks Peter, indeed that is also a possible solution, but then I have to live with two different remotes.

    And indeed I have tried it with a PC LS system together with a subwoofer. (Labtec).

    However the question is that my "kitchen" TV do have a HDMI-ARC connection, and I will apply this item for ease of only one remote needed!

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  • Former Member
    0 Former Member over 11 years ago

    I had the same recently and got one of these very cheap SPDIF->RCA converters Digital Optical Coaxial Toslink SPDIF to Analog RCA L/R Audio Converter Adapter | eBay.  which runs off 5V, at < 100mA.  Better would be a cheap amp with SPDIF integrated, but I haven't happened across that yet.  Raspberry Pi would be overkill for this job, I think.

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  • Former Member
    0 Former Member over 11 years ago in reply to Former Member

    Martyndavies thanks, can the SPDIF audio output be adjusted with means of the TV remote?

    If yes, perhaps ADAFRUIT website do have your cheap amplifier?

     

    I made a mistake my digital TV (Philips 22PFL3517H/12)  has only HDMI inputs and not a HDMI output, that is a pitty: I down't understand why this is missing?

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 11 years ago in reply to Former Member

    connectors cost money, as does the additional driver circuitry so on "Kitchen TV's" they skip it

     

    Peter

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  • Problemchild
    0 Problemchild over 11 years ago in reply to Robert Peter Oakes

    Seconded BOM cost is king .."How low can you go" is the motto of the day. That said I would try and find that 3.5mm Audio/headphone socket that is usually on the TV even if it's hidden around the back up and under!

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 11 years ago in reply to Problemchild

    yup, agree, that's why I suggested the standard headphone jack in the first place, never yet came across a TV without something for that. Simple, Easy, Cheap and it would require nothing more than a powered speaker

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  • Problemchild
    0 Problemchild over 11 years ago in reply to Problemchild

    Google is your Friend I pasted the model number and although it does not have phono out it does have SCART output so there you go

    Get the lead solve the problem image

    http://www.p4c.philips.com/cgi-bin/cpindex.pl?ctn=22PFL3517H/12&dct=QAC&faqview=1&refnr=0092089&scy=HR&slg=ENG&view=aa12_view_partial.html

    "

    Back to FAQ

      

    Question

    How can I connect my home theater system (HTS) or surround sound system (SSS) to the TV?

    Answer

    Your TV is equipped with several types of connections. The type of connection you should use to connect your audio system depends on which features of the audio system you want to use.

    If you wish to connect the audio out from the TV to the audio system.

    There are three ways to connect your TV to a audio system:

    • Digital audio output  Connect the audio cable from the 'DIGITAL AUDIO OUT' (coaxial) connection of the TV to the 'AUDIO IN' connection of the audio system.
       
    • HDMI Audio Return Channel (ARC)  This feature allows output of TV audio to a HDMI source with Audio return channel functionality. You do not need to connect a separate SPDIF audio connection. Connect the 'HDMI 1 ARC' connection of the TV with a HDMI-HDMI cable to the 'HDMI ARC' connection of the audio system.
       
    • Analogue audio out (red and white)  Your TV DOES NOT have an analogue audio out (red and white) cinch connection. In order to connect the audio out from the TV to an analogue stereo system, you will need a SCART-to-cinch cable. Insert the SCART connector into the 'SCART' connection on your TV and connect the red and white cinch cables to the corresponding audio input on the audio system.

    Follow these steps to connect the devices:

    1. Switch the TV and the audio system off.
    2. Connect choosing one of the above solutions.
    3. Switch the TV on and the audio system will automatically wake-up from standby if: If your audio system does not have the EasyLink autostart feature, manually switch the audio system on and select the input on the audio system to which the TV is connected.
      • The audio system is HDMI CEC compliant with EasyLink autostart functionality and activated.
      • The EasyLink feature on the TV needs to be set to [EasyLink autostart] mode in the [Setup] > [TV settings] > [EasyLink] > [TV speakers] menu.
      • The audio system and TV are connected via a HDMI cable.
    4. Select a TV channel.
    5. Adjust the volume on the audio system to hear the sound from the speakers of the audio system.
    6. If you do not wish to hear the sound from the TV, press the volume down button on the remote control to turn the TV's volume down or set to [Off] mode in the [Setup] > [TV settings] > [EasyLink] > [TV speakers] menu.
    7. You can also use the TV remote control to adjust the volume on the audio system if;
      • Your audio system is HDMI CEC compliant with system audio control functionality and activated.
      • The audio system and TV are connected via a HDMI cable.
    8. If you connect via the HDMI ARC connection, you need to set the HDMI-ARC feature to [On] mode in the [Setup] > [TV settings] > [EasyLink] > [HDMI1-audio out] menu.  NOTE: Make sure that your HTS is HDMI ARC-compliant and activated. For detailed information, refer to the user manual of the HTS.
    9. If you experience a delay in the audio signal from the HTS, verify if the digital audio lipsync feature in the [Setup] > [TV settings] > [Sound] > [Audio out delay] is set to [On] mode.
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  • Problemchild
    0 Problemchild over 11 years ago in reply to Problemchild

    Example cable

    http://www.amazon.co.uk/CABLEDUP-Phono-SCART-Switchable-cable/dp/B005ICL58Q/ref=sr_1_12?ie=UTF8&qid=1402501204&sr=8-12&keywords=SCART-to-cinch+cable

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  • Former Member
    0 Former Member over 11 years ago in reply to Former Member

    I don’t understand what make you believe that there is a value for an HDMI output in a TV receiver.

    The purpose of a TV is to show (screen) what is received, not to stream anything, hence there is no reason for an HDMI output.

     

    My $0.02,

     

    Jean-Paul

    AC9GH

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