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Can anyone recommend some free mobile apps that can convert audio files to text format, specifically for documenting meetings and interviews?

**Speech-to-text technology** is based on a concept called automatic speech recognition (ASR), which uses machine learning algorithms to recognize patterns in audio signals and transcribe them into text.

**Audio encoding** is a crucial step in speech-to-text conversion, where the audio signal is converted into a digital format that can be processed by computers.

**Frequency analysis** is used to extract specific features from the audio signal, such as pitch, tone, and rhythm, which help the algorithm to recognize speech patterns.

**Natural language processing (NLP)** is employed to analyze the transcribed text and identify grammatical structures, syntax, and semantic meaning.

**Deep learning models** are often used in speech-to-text apps to improve accuracy and adapt to different accents, dialects, and speaking styles.

**Audio compression** algorithms, such as MP3 or AAC, can affect the quality of the audio signal and, hence, the accuracy of the transcription.

**Noise reduction** techniques are used to filter out background noise, echoes, and other unwanted sounds that can degrade the audio signal.

**Dictation apps** use a process called **language modeling** to predict the next word or phrase in a sentence based on context and probability.

**Vocal characteristics**, such as tone, pitch, and cadence, can affect the accuracy of speech-to-text transcription, especially for speakers with unique vocal traits.

**Acoustic models** are used to analyze the audio signal and identify patterns that correspond to specific sounds, phonemes, and words.

**Language models** are employed to predict the probability of a word or phrase given the context, syntax, and semantics of the sentence.

**Post-processing algorithms** can be used to correct errors, resolve ambiguities, and improve the overall quality of the transcription.

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