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difference between speech codec and audio codec

Anis Monser
Prodigy 100 points

Hello,

 I want to know: what’s the difference between the speech codec and the audio codec.

I have some confusion about this subject

Regards

  • 0
    TI__Mastermind 46195 points

    Hello Anis,

    A Speech Codec is an audio CODer (ADC) and a dECoder (DAC) specific for voiceband applications. Typical applications include voice recorders, telephony, etc. The typical sampling rate can be around 8kHz-16kHz.

    An Audio Codec is a CODer-dECoder that can typically handle audio from voice-band to CD-quality audio and even professional audio. Typical applications include smart phones, MP3 players, professional recording interfaces, etc. Sampling rates can range from 8kHz to 192kHz.

    Regards,

    J Arbona

  • 0 in reply to J-
    Prodigy 100 points

    hello Mr J Arbona .

    thank you for your answer and for the clarifications.

  • 0 in reply to Anis Monser
    Prodigy 10 points

    Hello,

    if a handset supports WB-AMR as audio codec, does it mean that the handset supports WB-AMR as speech codec (HD clear voice calls)?

    Thanks for your reply

  • 0 in reply to hassan kamareddine
    TI__Mastermind 46195 points

    Hi Hassan,

    The products we develop are hardware audio ADCs and DACs (they code analog signals into digital and decode digitial signals to analog). Typically these are encoded into linear PCM (2's complement) without any type of compression, although we also support companding such as A-law and u-law in some of our devices.

    The majority of our audio codecs are versatile enough to be configured for the entire audio range, wideband or narrowband. This is achieved by the sample rate (i.e. 48ksps, 16ksps or 8ksps).

    Having said the above, in terms of sample rate, it is possible to work with wide-band AMR if the applications processor (i.e. external DSP) does the coding-decoding. In such case, our TI audio codec (converter) would:

    1) Receive linear PCM data from the processor's I2S bus and convert it to analog

    2) Send linear PCM data from microphone through the processor's I2S bus

    Regards,

    J-