The phrase "a determined voice" is correct and usable in written English.
It can be used to describe someone speaking with confidence and resolve, often in a context where their conviction is important.
Example: "She spoke with a determined voice, making it clear that she would not back down from her position."
Alternatives: "a resolute tone" or "a firm voice."
Suddenly a determined voice interrupted: "Mr. Eliot, apropos of tea, do you not consider Katherine Mansfield the most sensous of modern writers?" Everybody was grateful to the keen-witted young man who remembered that Katharine Mansfield had once written a story called "A Cup of Tea".
Through NEPAD, African leaders plan to give the continent a determined voice in its own destiny while simultaneously welcoming constructive engagement with developed countries.
I should have said, "Arnold," the head of the department; "I would like to meet with Arnold to discuss plans for the week". Just saying that in a determined voice would have made them think, Yes, what idiots we are, we must promote her and fire these other three employees instead!
My daughter recovered fully and as I held her tight I heard a determined voice inside me say.
Collective awe and reverence hushed the audience when as she declared in a determined voice which is still being recovered through speech therapy, "Strong women get things done".
In these pamphlets and in The ABC of Reading, he sought to emphasize the value of art and to "aestheticize the political" – written forcefully, according to Nadel, and in a "determined voice".
We firmly believed producers who made programmes should have a determining voice in the content and direction of those programmes.
Dismissing the first Duma (the elected legislative body created after the 1905 Revolution) on July 22 July 99, O.S ., 1906, because it demanded a determining voice in the formulation of an agrarian reform program, Stolypin, by executive decree, introduced his own reforms.
The party's left wing engineered a change in the governing rules to give the trade unions and local party organizations a determining voice in choosing the party's leader.
On Mother's Day, without a single written note and a firm, determined voice, Rev. Whitfield explained why he did not agree with the president's endorsement of same-sex marriage.
He winced and frowned, sceptical, taciturn, and doing a convincing impression of a man who has been taken hostage, sedated and tied to a sofa, and is now mumbling in a low, determined voice about set-piece opportunities and stonewall penalties in order to keep himself conscious until the Swat team arrives.
