Please read below.
Verry cool.

An Apple patent application discovered on Thursday outlines an
invention that uses metadata from emails, texts and other
communications to determine how a synthesized voice sounds in a
text-to-speech (TTS) system.





Source: USPTO
The filing, titled "Voice assignment for text-to-speech output," looks
to create "speaker profiles" which can change the voice
characteristics of TTS output to match parsed-out metadata like age,
sex, dialect and other variables.

 As noted by the application, many systems exist today to aid the
visually impaired, including the system on Apple's iPhone, however
most TTS engines "generate synthesized speech having voice
characteristics of either a male speaker or a female speaker.
Regardless of the gender of the speaker, the same voice is used for
all text-to-speech conversion regardless of the source of the text
being converted." Apple's invention proposes a different solution.

 Instead of hearing the same voice for every message, the invention
obtains metadata "directly from the communication or from a secondary
source identified by the directly obtained metadata" to create the
most suitable speaker profile.

 According to the patent filing, "Providing a speech output that is
associated with a speaker profile allows speaker recognition while
providing a more enjoyable and entertaining experience for the
listener."

An example is provided in which a user receives a message from
"Charles Prince," who has an email address of charles.pri...@isp.uk,
regarding a party for "Albert." In this case, the system could use the
".uk" address as primary metadata. Secondary metadata can be gathered
if a contact card is attached to the message, or if Charles Prince's
information is already in the user's address book.





Metadata samples.
The data from the text and the corresponding metadata are then fed
into a TTS engine, which assigns a speaker profile to convert the text
into speech.

After converting each word and phonetic transcription in the text to
distinct sounds that comprise a given language, the TTS engine then
divides and marks rhythmic sounds like phrases, clauses and sentences.

 In some implementations, speech can be created by piecing together
pre-recorded voice fragments, including sounds, entire words or even
sentences, that are stored on a mobile device or in an off-site
database.

 In other implementations, the TTS engine can include a synthesizer
that "incorporates a model of the human vocal tract or other human
voice characteristics to create a synthetic speech output according to
the speaker profile."

One of the most interesting iterations notes that "a speaker's voice
can be recorded and analyzed to generate voice data."

 From the patent filing's description:

For example, the speaker's voice can be recorded by a recording
application running on the device or during a telephone call (with
permission). The voice characteristics of the speaker can be obtained
using known voice recognition techniques. In this implementation, a
speaker profile may not be necessary as the speaker's name can be
directly associated with voice data stored in voice database.

As for output, the system may pick the ".uk" email address to use as
primary metadata, taking contact card information like a birthday to
determine sex and age, to subsequently output a speaker profile
matching an older male with a British accent. Charles Prince's
physical address, phone number, or picture can also be used to
determine a speaker profile. The more metadata available, the more
refined the output.





Flowchart of TTS system.
It is unclear if Apple plans to deploy such a system, however the
company currently has a similar, albeit less advanced, system in place
with Siri. While the feature is limited to certain regions, Siri has
an option to choose dialects like "English (United States)" or
"English (United Kingdom)" to recognize incoming voice commands, as
well as provide responses in the selected accent.



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This article was taken from apple insider.

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