Abstract: A sound carrier detecting circuit for use in a television or a video tape recorder is disclosed. During the sound carrier detection, the carrier frequency of the sound signals is corrected by utilizing pulse width modulation signals output from a microprocessor, so that the noise due to shifting of the detected frequency can be eliminated. The circuit includes a key input part provided with one or more keys for selecting a tuning state, and a microprocessor for outputting pulse width modulating signals and manual sound tuning signals in response to appropriate settings of the key input means. A variable oscillating part for converting the pulse width modulating signals into dc component signals and, in turn, outputting variable frequency signals in accordance with the level of the dc component signals is provided alongside a frequency modulating and oscillating part which oscillates and outputs set frequency signals set to a specific frequency in accordance with the relevant broadcasting method.