TOKYO (AP) — The 4 ½-minute speech that has reverberated throughout Japan's modern history since it was delivered by Emperor Hirohito at the end of World War II has come back to life in digital form.

Hirohito's "jewel voice" — muffled and nearly inaudible due to poor sound quality — was broadcast on Aug. 15, 1945, announcing Japan's surrender.

On Saturday, the Imperial Household Agency released the digital version of the original sound ahead of the 70th anniversary of the speech and the war's end. In it, the emperor's voice appears clearer, slightly higher and more intense, but, Japanese today would still have trouble understanding the arcane language used by Hirohito.

"The language was extremely difficult," said Tomie Kondo, 92, who listened to the 1945 broadcast in a monitoring room at NHK public broadcaster, where she worked as a newscaster.

"It's well written if you read it, but I'm afraid not many people understood what he said," she said. Poor reception and sound quality of the radio made it even worse.

"I heard some people even thought they were supposed to fight even more," she said. "I think the speech would be incomprehensive to young people today."

Every Japanese knows a part of the speech where Hirohito refers to his resolve for peace by "enduring the unendurable and suffering what is insufferable," a phrase repeatedly used in news and dramas about the war. But the rest is little known, largely because the text he read was deliberately written in arcane language making him sound authoritative and convincing as he sought people's understanding about Japan's surrender.

Amid growing concern among many Japanese over nationalist Prime Minister Shinzo Abe's push to expand Japan's military role, the current Emperor Akihito is increasingly seen as liberal and pacifist, and the effort by his father, Hirohito, to end the war has captured national attention.

On the eve of the announcement, Hirohito met with top government officials to approve Japan's surrender inside a bunker dug at the palace compound.

Amid fear of violent protest by army officials refusing to end the war, the recording of Hirohito's announcement was made secretly. NHK technicians were quietly called in for the recording. At almost midnight, Hirohito appeared in his formal military uniform, and read the statement into the microphone, twice.

A group of young army officers stormed into the palace in a failed attempt to steal the records and block the surrender speech, but palace officials desperately protected the records, which were safely delivered to NHK for radio transmission the next day.

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Follow Mari Yamaguchi at twitter.com/mariyamaguchi