The sound of the old man's groan is familiar to the narrator because it triggers a deep sense of guilt within him. The groan reminds the narrator of his own internal turmoil and the fear of being discovered for the murder he committed. Ultimately, it symbolizes the narrator's increasing paranoia and descent into madness.
Other than the title, The Telltale Head being a play on The Telltale Heart the similarities lie in The Telltale Heart having the narrator, who is presumably the murderer, being haunted by the sound of the victim's beating heart. Bart, who is also the narrator of The Telltale Head briefly, is haunted by the voice of Jebidiah Springfield.
One example of onomatopoeia in "The Tell-Tale Heart" is the sound of the old man's heart beating loudly, which is described as "thump, thump, thump" as the narrator becomes more and more agitated by the noise.
Peter West has written: 'The telltale heart'
Treasury Men in Action - 1950 The Case of the Telltale Heart 4-5 was released on: USA: 24 September 1953
The narrator
Rude Awakening - 1998 Telltale Heart 3-13 was released on: USA: 14 September 2000 France: 5 May 2002 Hungary: 11 January 2009
The sound that drives the narrator to confess the crime is a heart; (the heart of the man he killed or the his own?)
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Narrator
They have much in common both being unreliable and mad. But to the differences. In the Cask of the Amontillado the narrator is angry and bent on revenge. In the tell-tale heart the narrator is sincere and acts our of paranoia.
The narrator keeps insisting that he is not mad in "The Tell-Tale Heart."
There are two narrators in Heart of Darkness. The first is unknown and the second is Marlow.