No, he was not.
Jesus as the LORD GOD ALMIGHTY did not need to throw his voice or use the voice box and throat and mouth and tongue of the Son of God.
God gives voice to his presence as Spirit and does not have some body or need it to do so.
So when a sound came from heaven (atmosphere) God invisible and Omnipresent everywhere gives voice to his presence.
It was our God and Father, Jesus the Lord speaking, not Jesus Christ the Son of God a man.
Jesus Spirit is not a bird, the bird was a mere visual appearance to show the anointed Christ/Messiah and for John to know who this was.

A man, Christ Jesus was in the water, God's Spirit was given a visible appearance and temporary only for to show who this was and IS NOT A BIRD and not another person.
God's invisible presence was voiced for mankind, He is the only God present and is Spirit and is Jesus our one true God and Father.

SO THE VOICE WAS GOD THE FATHER'S, WHO IS JESUS according to Isa. 9:6 and Rev. 21:6-7 and the verses that say that God is our Father and if Jesus as to Spirit is God, then he has to be as the only true God, the Father John 17:1-3.
Tell me cheachea if the Father is the only true God, then you believe there is a false couple of other gods and Jesus is a fraud.