هَذَا صَوْتُ الْغُرَابِ — This is the crow’s sound.
هَذَا: demonstrative, indeclinable, in the nominative position as the topic.
صَوْتُ: nominative predicate with ḍammah; first term of an iḍāfah.
الْغُرَابِ: genitive second term of the iḍāfah with kasrah.
This is a teaching example, not a book quotation. Note the visible nominative on the ordinary noun صَوْتُ.