Sony Ericsson Mobile Communications Ab

Sony Mobile Communications Ab

Stefan Gustavsson

Eric Douglas Romesburg

Peter Isberg

Per Olof Hiselius

Dag Glebe

Fredrik Stenmark

Markus Mimer

The invention relates to a portable device with an enhanced stereo image, and more particularly a device in which an unsymmetrical placement of loudspeakers is compensated by means of electronic adjustment of the phase and level of the sound. The present invention provides a device () comprising a sound source outputting audio channels in stereo, a sound reproduction system delivering electronic sound signals based on the audio channels to at least two loudspeakers () for sound reproduction with a stereo image. The device further comprises means for adjusting the level and phase of one of the sound signals to one loudspeaker ().

Portable device with enhanced stereo image

A communication device is provided that includes a speaker for outputting a ringing signal, a microphone for receiving the ringing signal, and logic configured to analyze the spectral content of the received ringing signal and adjust noise reduction parameters and echo cancellation parameters based on the analyzed spectral content of the received ringing signal.

Echo cancellation and noise reduction adaptation during ringing signal playback

A device includes a sound signal analyser configured to determine whether a sound signal comprises speech. The device further includes a microphone system configured to discriminate sounds emanating from sources located in different directions from the microphone system so that sounds only emanating from a range of directions are included as signals possibly containing speech.

Device and method for voice activity detection based on the direction from which sound signals emanate

A method and apparatus provide multichannel signal limiting to prevent any channel signal within a multichannel signal from exceeding defined limits, while still preserving the gain and/or amplitude relationships among the individual channel signals. A limiter is configured to calculate a limiting factor as the value needed to prevent a limit violation on the worst-case one of the channel signals, and then commonly apply that limiting factor to the gain control of all channel signals. Thus, the limiter may generate an actual gain value for each channel signal as the product of that channel signal's desired gain value and the current value of the limiting factor. Notably, in multichannel audio signal applications, coordinating gain control across the individual audio channels by use of the commonly applied limiting factor prevents undesirable spatial shifting of the soundstage, e.g., shifting of the stereo image.

Method and apparatus for multichannel signal limiting

The present invention is directed towards a portable electronic equipment () comprising a speaker () and a receiver (), wherein the receiver () is damped while the speaker () is active to provide good sound reproduction.

Sound reproduction in portable electronic equipment

An electronic device can be operated to detect noise, such as wind noise. A microphone signal is generated by a microphone. Autocorrelation coefficients are determined based on the microphone signal. Gradient values are determined from the autocorrelation coefficients. The presence of a noise component in the microphone signal is determined based on the gradient values.

Electronic devices, methods, and computer program products for detecting noise in a signal based on autocorrelation coefficient gradients

An electronic device can be operated to detect noise, such as wind noise. A microphone signal is generated by a microphone. Autocorrelation coefficients are determined based on the microphone signal. Gradient values are determined from the autocorrelation coefficients. The presence of a noise component in the microphone signal is determined based on the gradient values

A control cord for connecting an auxiliary device to a portable electronic device is provided. The control cord includes a flexible longitudinal housing and a plurality of electrical conductors extending from one end of the housing to which the auxiliary device will be connected, to an other end of the housing. In addition, the control cord includes a connector affixed to the other end of the housing and configured to connect the plurality of electrical conductors to the portable electronic device to enable operation of the portable electronic device in cooperation with the auxiliary device. The connector includes at least one terminal configured to be received by the portable electronic device, and the at least one terminal provides a control input to the portable electronic device, the control input being derived from physical manipulation of the housing.

Cord control and accessories having cord control for use with portable electronic devices

Noise, such as wind noise, for example, may be detected in an electronic device by generating first and second microphone signals. Cross correlation coefficients are determined for the first and the second microphone signals and autocorrelation coefficients are determined for the first and second microphone signals, respectively. A determination may be made with regard to the presence of a noise component in at least one of the microphone signals based on the cross correlation coefficients, the first autocorrelation coefficients, and the second autocorrelation coefficients.

Electronic devices, methods of operating the same, and computer program products for detecting noise in a signal based on a combination of spatial correlation and time correlation

A microphone circuit includes a first microphone, a second microphone, an adjustable delay unit, and a combiner. The first microphone generates a first microphone signal that includes a contribution associated with an output signal that is generated by a loudspeaker in response to an input signal. The second microphone generates a second microphone signal that includes a contribution associated with the output signal from the loudspeaker. The adjustable delay unit delays the second microphone signal relative to the first microphone signal by a delay value. The combiner combines the delayed second microphone signal and the first microphone signal to provide a combined microphone signal. The adjustable delay unit adjusts the delay value so as to reduce at least a portion of the contribution to the combined microphone signal that is associated with the output signal from the loudspeaker.

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Helsingborg, Sweden

Stefan Gustavsson