A processing module for a noise control circuit may include a howling detector configured to receive an input signal and to determine a linearity metric based on the input signal, the linearity metric comprising a measure of the linearity of a logarithmic representation of the energy of the input signal. The processing module may also include a gain adjuster configured to adjust the gain of a noise control unit.

An operation method of a terminal may include: executing a voice call service between the terminal and at least one terminal; determining at least one short-range terminal existing within a preset range from among the at least one terminal, based on location information of the terminal; detecting a howling frequency band in which howling occurs between the terminal and the at least one short-range terminal from among a plurality of frequency bands in which the voice call service is performed, based on information of the plurality of frequency bands; and removing the howling by adjusting a gain of the howling frequency band.

The present disclosure provides a receiver module comprising a receiver, the receiver comprising a basin frame, a vibration system and a front cover, the receiver module further comprises: a fixing member disposed on the front cover, a noise canceling member fixed to a side of the fixing member adjacent to the front cover, and a microphone disposed on a side surface of the noise canceling member away from the vibration system; the fixing member comprises a body portion fixed on the front cover, an extending portion extending from the body portion in a direction away from the front cover, and a through hole penetrating through both the body portion and the extending portion; the noise canceling member is located outside the basin frame and fixed to the extending portion, and it comprises a main body portion and a sound absorption hole penetrating through the main body portion.

The present disclosure provides a receiver module comprising a receiver, the receiver comprising a basin frame, a vibration system and a front cover, the receiver module further comprises: a fixing member disposed on the front cover, a noise canceling member fixed to a side of the fixing member adjacent to the front cover, and a microphone disposed on a side surface of the noise canceling member away from the vibration system; the fixing member comprises a body portion fixed on the front cover, an extending portion extending from the body portion in a direction away from the front cover, and a through hole penetrating through both the body portion and the extending portion; the noise canceling member is located outside the basin frame and fixed to the extending portion, and it comprises a main body portion and a sound absorption hole penetrating through the main body portion.

An electronic device may include a housing and a directional microphone. The housing may include a front surface, a rear surface positioned opposite the front surface, and a hollow cavity positioned between the front surface and the rear surface. The hollow cavity may include a front opening defined in the front surface and a rear opening defined in the rear surface. The directional microphone may include a front port and a rear port. The directional microphone may be mounted in the hollow cavity of the housing with the front port oriented toward the front opening and with the rear port oriented toward the rear opening.

An electronic device may include a housing and a directional microphone. The housing may include a front surface, a rear surface positioned opposite the front surface, and a hollow cavity positioned between the front surface and the rear surface. The hollow cavity may include a front opening defined in the front surface and a rear opening defined in the rear surface. The directional microphone may include a front port and a rear port. The directional microphone may be mounted in the hollow cavity of the housing with the front port oriented toward the front opening and with the rear port oriented toward the rear opening.

The present disclosure provides a receiver module comprising a receiver, the receiver comprising a basin frame, a vibration system and a front cover, the receiver module further comprises: a fixing member disposed on the front cover, a noise canceling member fixed to a side of the fixing member adjacent to the front cover, and a microphone disposed on a side surface of the noise canceling member away from the vibration system; the fixing member comprises a body portion fixed on the front cover, an extending portion extending from the body portion in a direction away from the front cover, and a through hole penetrating through both the body portion and the extending portion; the noise canceling member is located outside the basin frame and fixed to the extending portion, and it comprises a main body portion and a sound absorption hole penetrating through the main body portion.

The present disclosure provides a receiver module comprising a receiver, the receiver comprising a basin frame, a vibration system and a front cover, the receiver module further comprises: a fixing member disposed on the front cover, a noise canceling member fixed to a side of the fixing member adjacent to the front cover, and a microphone disposed on a side surface of the noise canceling member away from the vibration system; the fixing member comprises a body portion fixed on the front cover, an extending portion extending from the body portion in a direction away from the front cover, and a through hole penetrating through both the body portion and the extending portion; the noise canceling member is located outside the basin frame and fixed to the extending portion, and it comprises a main body portion and a sound absorption hole penetrating through the main body portion.

The application describes techniques for howling detection. A processing module for a noise control circuit is described. The processing module comprises a howling detector configured to receive an input signal and to determine a log-linearity metric based on the input signal. Gain adjustment of the noise control unit following the detection of howling is also described, wherein the amount of gain adjustment may be based on an estimation of the maximum stable gain of the noise control unit.

The application describes techniques for howling detection. A processing module for a noise control circuit is described. The processing module comprises a howling detector configured to receive an input signal and to determine a log-linearity metric based on the input signal. Gain adjustment of the noise control unit following the detection of howling is also described, wherein the amount of gain adjustment may be based on an estimation of the maximum stable gain of the noise control unit.