Home of the Squeezebox™ & Transporter® network music players.
Results 1 to 9 of 9
  1. #1
    Junior Member
    Join Date
    Oct 2020
    Posts
    23

    How do i know the digital output bit-rate from Touch?

    Since my dac doesn't come with display of input bit-rate, can I have the digital output bit-rate from Touch ?
    Thank you !

  2. #2
    Senior Member Stratmangler's Avatar
    Join Date
    Oct 2008
    Location
    Rossendale UK
    Posts
    606
    The Touch handles the usual sample rates up to 96kHz natively.
    Beyond that, you need to install the EDO applet, and it will go up to 192kHz.
    Last edited by Stratmangler; 2020-10-18 at 07:15.
    Chris :)

  3. #3
    Junior Member
    Join Date
    Oct 2020
    Posts
    23
    Quote Originally Posted by Stratmangler View Post
    The Touch handles the usual sample rates up to 96kHz natively.
    Beyond that, you need to install the EDO applet, and it will go up to 192kHz.
    Thank you for the info.

    But I am not asking the max sample rate supported by Touch.

    I want to know the real-time sample rate from Touch.

  4. #4
    Senior Member
    Join Date
    Jan 2010
    Location
    Hertfordshire
    Posts
    6,264
    Quote Originally Posted by hankhsucc View Post
    Thank you for the info.

    But I am not asking the max sample rate supported by Touch.

    I want to know the real-time sample rate from Touch.
    You can see it in the webUI now playing screen.

    Sent from my Pixel 3a using Tapatalk

  5. #5
    Junior Member
    Join Date
    Oct 2020
    Posts
    23
    Quote Originally Posted by slartibartfast View Post
    You can see it in the webUI now playing screen.

    Sent from my Pixel 3a using Tapatalk

    OK. Thanks ! I can see the bit-rate on WebUI now.
    But all my music files are Redbook CD ripped by "Exact Audio Copy" in lossless FLAC compressed mode.
    It is supposed the bit-rate be 1411k CBR, but what the WebUI shows is various bit-rate (VBR) under 1411k.

    For example, 640K VBR, 712K VBR, ...

    Why ? Thank you !

  6. #6
    Senior Member
    Join Date
    Jan 2010
    Location
    Hertfordshire
    Posts
    6,264
    Quote Originally Posted by hankhsucc View Post
    OK. Thanks ! I can see the bit-rate on WebUI now.
    But all my music files are Redbook CD ripped by "Exact Audio Copy" in lossless FLAC compressed mode.
    It is supposed the bit-rate be 1411k CBR, but what the WebUI shows is various bit-rate (VBR) under 1411k.

    For example, 640K VBR, 712K VBR, ...

    Why ? Thank you !
    FLAC files have a lower bitrate than wave but are lossless.

    Sent from my Pixel 3a using Tapatalk

  7. #7

  8. #8
    Senior Member
    Join Date
    Oct 2005
    Location
    Ireland
    Posts
    20,146
    Quote Originally Posted by hankhsucc View Post
    Thank you for the info.

    But I am not asking the max sample rate supported by Touch.

    I want to know the real-time sample rate from Touch.
    I think you are mixing up "sample rate" and "bit rate"

    Sample rate is the number of audio sample per sec to make up audio stream e.g. CD 44,100 16 bit samples

    The audio stream of a specific sample rate can then be compressed (lossy or lossless) into data stream of bits which has a data rate or bit rate (i.e. kbits/sec). The slower the data rate the greater the compression.

    Bit rate was important was using live stream such with digital radio DAB or TV DVB as player had no buffers - bandwidth of transmission medium (e.g. satellite, terrestrial) restricted data rate of compressed audio stream of typically 44.1Khz / 48kHz 16 bit.

    Touch is a buffered played so data is sent in bursts so bit rate is not sdignificant.
    Touch will decode the data streams and output the audio sample rate of the data streams - realtime audio sample rate of 44.1Khz 16 bit will be sent from digital output regards of whether the data source is
    PCM - 1411k
    Flac - about 700kb (can vary according to compression level )
    MP3 - typically from 32kbs up to 320kbs

    CBR will have a maximum data rate, VBR will be varying but an average data rate as speced - again the realtime audio sample rate after decompressing will be same as source 44.1Khz 16bit

  9. #9
    Junior Member
    Join Date
    Oct 2020
    Posts
    23
    Thank you so much ! It is clear now.

    Quote Originally Posted by bpa View Post
    I think you are mixing up "sample rate" and "bit rate"

    Sample rate is the number of audio sample per sec to make up audio stream e.g. CD 44,100 16 bit samples

    The audio stream of a specific sample rate can then be compressed (lossy or lossless) into data stream of bits which has a data rate or bit rate (i.e. kbits/sec). The slower the data rate the greater the compression.

    Bit rate was important was using live stream such with digital radio DAB or TV DVB as player had no buffers - bandwidth of transmission medium (e.g. satellite, terrestrial) restricted data rate of compressed audio stream of typically 44.1Khz / 48kHz 16 bit.

    Touch is a buffered played so data is sent in bursts so bit rate is not sdignificant.
    Touch will decode the data streams and output the audio sample rate of the data streams - realtime audio sample rate of 44.1Khz 16 bit will be sent from digital output regards of whether the data source is
    PCM - 1411k
    Flac - about 700kb (can vary according to compression level )
    MP3 - typically from 32kbs up to 320kbs

    CBR will have a maximum data rate, VBR will be varying but an average data rate as speced - again the realtime audio sample rate after decompressing will be same as source 44.1Khz 16bit

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •