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| Number | Title | Issue Date |
| 8160272 | Audio output circuits having ramped attenuation circuits that inhibit pop disturbances when audio sources are switched An audio output circuit includes a port attenuation circuit, which is configured to convert an abrupt dc voltage offset transition between a pair of audio signals received in sequence at an input thereof into a more gradual transition. This conversion is achieved by... | 04/17/2012 |
| 8155347 | Pop noise eliminating circuit that disables an audio output device when turning the device on An pop noise eliminating circuit includes a power source, a grounding terminal, a speaker, an audio amplifier that has two opposite ends respectively connected with the power source and the first end of the speaker, a delay unit that has one end electrically connect... | 04/10/2012 |
| 8103021 | Audio reproducing apparatus An audio reproducing apparatus includes a power supply, an amplifier, a speaker, and a controller. The power supply is for supplying a voltage. The amplifier is for receiving the voltage and audio signals, amplifying the audio signals, and outputting amplified audio... | 01/24/2012 |
| 8098847 | Muting circuit A muting circuit comprising: a DC offset eliminating unit including an HPF (High Pass Filter) constituted by a first operational amplifier to eliminate a DC offset component of an AC input signal, the DC offset eliminating unit being configured to output an output s... | 01/17/2012 |
| 8081774 | Circuit for eliminating pop sounds at power on and off by a moderate waveform A circuit for eliminating pop sounds at power on and off by a moderate waveform, which includes a switch, a feedback network, an operational amplifier and an output network. When power-on, a first input terminal of the switch is connected to a low voltage, and an ou... | 12/20/2011 |
| 8077879 | Audio output apparatus and television broadcast receiver When an abnormality occurs in a supply circuit and its output is decreased, a protect circuit detects the abnormality and outputs a protect signal to an audio circuit. The audio circuit upon detection of the protect signal stops outputting audio so that outputting o... | 12/13/2011 |
| 8073158 | Circuit for eliminating noise A circuit for eliminating noise includes a sound card (30) with an audio signal output, a power supply (10) for providing working voltage to the sound card, a first transistor (Q1), a second transistor (Q2), and a third transistor (Q3 | 12/06/2011 |
| 8059831 | Noise processing device and method thereof A noise processing device and its method are provided for a video/audio system having a high definition multimedia interface (HDMI). The noise processing device includes a detecting unit, a signal generating unit, and a decision unit. The noise processing method inc... | 11/15/2011 |
| 8050423 | Integrated circuit device and audio system An n-channel integrated circuit device (n is an integer of 1 or greater) for muting an audio signal includes a control circuit configured to generate a control signal and a delayed control signal, a charging and discharging circuit configured to charge and discharge... | 11/01/2011 |
| 7991169 | Charge/discharge control circuit for audio device A charge/discharge control circuit for controlling current through an input/output audio device includes a first voltage reference; a second voltage reference and a waveform generation circuit responsive to the first and second voltage references for generating a mu... | 08/02/2011 |
| 7957544 | Audio signal output control device that suppresses pop sound The potential of a smoothing capacitor for a speaker is smoothly changed by controlling the potential with use of a PWM signal and switching between outputting the PWM signal and an actual audio signal, thereby suppressing a pop sound. The scale of circuitry is redu... | 06/07/2011 |
| 7940940 | Muting circuit and semiconductor integrated circuit A muting circuit of the present invention includes: an input terminal that receives a control signal for allowing switching between ON and OFF of a mute operation; and a muting transistor connected to the input terminal and an output terminal of the amplifier. The m... | 05/10/2011 |
| 7881481 | Audio processing apparatus and method Disclosed herein are an audio processing apparatus and method. In an embodiment, if a playing mode that abruptly changes the level of audio being played has been input, the data of the audio is processed to mitigate the abrupt change in the level of the audio and co... | 02/01/2011 |
| 7817807 | Audio output driver and methods for use therewith An audio output driver includes an audio amplifier for generating an amplified signal. A virtual ground generator generates a virtual ground signal in response to a virtual ground reference. A combiner produces an output signal, based on the amplified signal and the... | 10/19/2010 |
| 7804967 | Circuit for preventing output of pop noise Disclosed is a circuit for preventing an output of a pop noise, which occurs from an audio amplifier when a power switch of an electronic device loading the amplifier is turned on/off. The circuit may comprises an analog switch for switching an electrical connection... | 09/28/2010 |
| 7787639 | Circuit for suppressing audio noise A circuit for suppressing audio noise having a common node electrically connected to an output terminal of a preamplifier and an input terminal of a postamplifier is disclosed, in which the preamplifier is provided power by a second voltage supply. The circuit for s... | 08/31/2010 |
| 7760892 | Noise elimination circuit for audio equipment A noise elimination circuit of a audio output device includes a sound card for receiving a digital audio signal and transforming it to an analog audio signal; an audio reproduction apparatus such as a audio output device connected to the sound card for receiving the... | 07/20/2010 |
| 7711128 | System, circuit, and amplifier for reducing pop sound An audio power amplifier includes a differential amplifier circuit that serves as an input circuit. The differential amplifier circuit includes a signal GND (SG) terminal that receives a SG voltage, and an audio signal input terminal that receives an audio signal. A... | 05/04/2010 |
| 7693293 | Sound processing device and input sound processing method Provided is a sound processing device including: a sound input unit for dividing an input sound into predetermined time units; a sound processing unit for encoding the input sound thus divided; a noise detecting unit; and an output control unit for replacing encoded... | 04/06/2010 |
| 7463742 | Signal output circuit A signal output circuit for controlling output of an input signal is disclosed. The signal output circuit includes an internal circuit, a digital delay circuit delaying by digital processing a control signal for controlling the operation of the internal circuit, and... | 12/09/2008 |
| 7430255 | Impulse noise suppression device Digital audio data with error detection bits added thereto is inputted to an error detecting and correcting device (4). The correcting device (4) corrects an error when the error is detected in the digital audio data. The digital audio data outputted f... | 09/30/2008 |
| 7372325 | Mute circuit An NchMOS transistor (1) is provided for muting of an output terminal (10) to which positive and negative output signals are outputted, and a mute switch circuit (3) is provided for controlling on/off of the transistor (1) by switching a ... | 05/13/2008 |
| 7366309 | Robot A robot includes first and second microphones and movable portions. The first microphone gathers a first sound reception signal by gathering mainly a target signal. The second microphone gathers a second reception sound signal by gathering mainly noise other than th... | 04/29/2008 |
| 7362871 | Audio amplifier circuit and audio IC having the same In the present invention, in parallel with a resistor which determines an amplification rate being fed back from an output to an input of an output stage OP amp in an audio amplifier circuit, providing a first diodes connected bi-directionally together with a first ... | 04/22/2008 |
| RE39949 | Sound intermediate frequency amplifier for a broadcast receiver In a broadcast receiver, a dc voltage operating source is coupled to an operating voltage terminal of a sound IF integrated circuit via a collector/emitter path of a transistor, and a second source of operating voltage is connected via an RC integrating network to t... | 12/25/2007 |
| 7313244 | Circuit and method for eliminating pop noise in digital audio amplifier using dual power supply Provided are a circuit for and a method of eliminating pop noise in a digital audio amplifier using dual power supply, which are simple, drop in price, and can be readily implemented in a semiconductor chip. According to an existing technique, pop noise is eliminate... | 12/25/2007 |
| 7265614 | Amplifier circuit with reduced power-off transients and method thereof In an amplifier circuit with reduced power-off transients, an amplifier is provided for receiving an input signal and a reference signal to generate an output signal therefrom when it is enabled, and the amplifier is disabled when the supply voltage to the amplifier... | 09/04/2007 |
| 7259619 | Amplifier circuit with reduced power-on transients and method thereof In an amplifier circuit with reduced power-on transients, an amplifier has a gain to generate an output signal from an input signal and a reference signal when it is enabled, and a control circuit generates a control signal, based on the output signal and the refere... | 08/21/2007 |
| 7254244 | Pop and click reduction using DAC power up and power down processing An audio amplifier generates an output to a load, in which a digital-to-analog converter drives the amplifier during powering up and powering down the amplifier. The digital-to-analog converter controls the amplifier to ramp the voltage at the output at a predetermi... | 08/07/2007 |
| 7245169 | Offset correcting method, offset correcting circuit, and electronic volume An offset correcting circuit includes: an amplifying unit including an offset adjusting unit that adjusts an offset of the amplifying unit; and an offset determining unit that outputs a signal to detect and corrects the offset of the amplifying unit. The offset dete... | 07/17/2007 |
| 7242783 | Audio limiting circuit An audio limiting circuit capable of satisfying frequency dependent limits and time domain constraints, is disclosed. In one illustrative embodiment, an input node receives an unattenuated input signal and a system modeling filter predicts the amount, if any, by whi... | 07/10/2007 |
| 7230557 | Audio codec adapted to dual bit-streams and methods for use therewith A audio codec includes a first analog to digital converter for producing a first one-bit data stream, a second one-bit data stream is received from a digital microphone. A selection module produces a one-bit output signal that is the first one-bit data stream when a... | 06/12/2007 |
| 7203325 | Audio processing device An audio processing device for processing an audio input signal comprises one or more noise reducing means, noise level measuring means and control means connected to the noise level measuring means for controlling the noise reducing means. The audio processing devi... | 04/10/2007 |
| 7187774 | Mute switch A mute switch including a field effect transistor receiving a mute control signal at its gate for selectively supplying an audio signal from an input node to an output node. A bipolar transistor is connected between the input node and the FET for reducing the voltag... | 03/06/2007 |
| 7164312 | Apparatus and method for pop-and-click suppression with fast turn-on time A circuit for audio amplification includes an amplifier and a first input resistor. The amplifier is arranged to provide an amplifier output signal that is based, in part, on a capacitively-coupled audio input signal. The capacitively-coupled audio input signal is b... | 01/16/2007 |
| 7161424 | Signal output apparatus A signal output circuit for switching an output operation of an input signal is disclosed. The signal output circuit includes a delaying circuit for delaying a control pulse transmitted from outside, an integrating circuit for generating an integrated waveform of th... | 01/09/2007 |
| 7146194 | Amplifying circuit, speaker system, and mobile information terminal employing amplifying circuit An amplifying circuit includes a battery power source, a regulator that regulates an output of the battery power source and generates a reference voltage, and a signal ground generating device that generates and outputs a signal ground by changing the reference volt... | 12/05/2006 |
| 7146015 | Frequency threshold audio activity detector This invention is a circuit that actuates a loudspeaker at input frequencies above a predetermined threshold and mutes the loudspeaker at input frequencies below the threshold. The circuit includes a comparator that generates a pulse train proportional in frequency ... | 12/05/2006 |
| 7130340 | Noise margin self-diagnostic receiver logic A noise margin self-diagnostic receiver circuit has been developed. The self-diagnostic circuit includes one comparator for comparing the signal voltage to a high reference voltage, a second comparator for comparing the signal voltage to a low reference voltage, and... | 10/31/2006 |
| 7127074 | Method and apparatus for sleep conditioning Disclosed is a baby monitor which includes a base unit having a microphone for receiving sound and a transmitter for conveying the sound to a remote unit, and a remote unit including a receiver for receiving the sound from the transmitter and a speaker for reproduci... | 10/24/2006 |
