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| Number | Title | Issue Date |
| 8369542 | Power control apparatus, speaker apparatus and power control method The speaker apparatus according to the invention is arranged in a manner that when the magnitude of an audio signal Sin increases temporarily and so a consumption power increases, a DC-DC converter reduces an output voltage Vout to thereby increase an output current... | 02/05/2013 |
| 8130982 | Signal amplifying apparatus, amplification system, and signal amplification method An amplification system of the invention can decrease power consumption in a power amplification section if the power amplification section need not be used. The power consumption in the power amplification section can be decreased by shutting off power feed into a ... | 03/06/2012 |
| 8094842 | Loudspeaker system and loudspeaker enclosure A loudspeaker system includes a loudspeaker enclosure having an inside space, a loudspeaker provided on the loudspeaker enclosure, a first diaphragm which has one of ends fixed to a surface of the loudspeaker enclosure and the other end, a second diaphragm which has... | 01/10/2012 |
| 8050424 | Speaker system, audio amplifier and audio system Speaker system is constructed of a plurality of speakers each including a bass-reflex type cabinet. The speaker system is designed to differentiate a low-band resonance frequency between the speakers by differentiating inner cubic capacities of the speaker cabinets ... | 11/01/2011 |
| 7986792 | Adapter connectable between audio amplifier and transmitter for cordless speaker An adaptor is connectable between a signal processor and a transmission module. The signal processor has three audio channels for feeding respectively a first audio signal, a second audio signal, and a third audio signal having a frequency range lower than a frequen... | 07/26/2011 |
| 7940943 | Speaker driving apparatus A speaker driving apparatus includes a speaker enclosure whose inside is tightly closed, at least two speakers that are provided to the speaker enclosure so as to have a common rear space, and a signal supplying unit that supplies a stereo left channel signal to the... | 05/10/2011 |
| 7912229 | Array driving system and method of driving loads Power amplifies are provided to correspond with a plurality of speaker units constituting a speaker array. Driving signals from the power amplifies are supplied to one terminals of the speaker units, and other terminals are connected a common line. Inverters are pro... | 03/22/2011 |
| 7481295 | Speaker system and speaker enclosure A speaker system, includes a speaker enclosure that has a surface, a speaker that is mounted in the speaker enclosure, a vibration portion that has one end fixed on the surface of the speaker enclosure so as to be allowed to vibrate elastically, an opening portion t... | 01/27/2009 |
| 7362180 | Protection circuit of digital amplifier A protection circuit of a digital amplifier includes a DC voltage detection circuit for detecting a DC voltage occurring in a loudspeaker output terminal; a control circuit for performing protection operation when the DC voltage detection circuit outputs a detection... | 04/22/2008 |
| 7301094 | Device for driving vibration source A vibration source driving device that realizes various vibration functions on portable telephones. The vibration source driving device includes a sound source for generating musical tone signals in response to music data. A vibration source to generate vibration, a... | 11/27/2007 |
| 7253350 | Vibration source driving device A vibration source driving device that realizes various vibration functions on portable telephones. The vibration source driving device includes a sound source for generating musical tone signals in response to music data. A vibration source to generate vibration, a... | 08/07/2007 |
| 7209374 | Capacitor-input positive and negative power supply circuit There is provided a power supply circuit having a simple configuration which is capable of eliminating an adverse effect due to pumping operation. The capacitor-input positive and negative power supply circuit is comprised of diodes, switching circuits connected in ... | 04/24/2007 |
| 7119499 | Switching power device A switching power device uses a non-capacitor flyback converter circuit not provided with a smoothing input capacitor having a large capacity. Therefore, a power harmonic can be suppressed and a rush current preventing element is not required. A fluctuation in an ou... | 10/10/2006 |
| 7075123 | Semiconductor input protection circuit A lateral PNP transistor PB and a lateral NPN transistor NB are serially connected between an input terminal and a reference potential (ground potential). In the transistor PB, a diode D1 is formed. In the transistor NB, a diode D3 is formed. W... | 07/11/2006 |
| 6980058 | Amplifier circuitry Input signal amplified by an input amplifier is delivered via a voltage limiter circuit to a power amplifier, and a speaker is driven by the signal amplifier by the power amplifier. Voltage produced across a resistor, which is proportional to an output current flowi... | 12/27/2005 |
| 6937091 | Class D amplifier A complementary signal generating circuit (301) generates first complementary signals (S1, S2) from a PWM signal. A signal converting circuit (302) converts the first complementary signals to second complementary signals (S3, S4... | 08/30/2005 |
| 6903577 | Delay circuit An input signal (SIN) is inverted by an inverter (101), and the inverted input signal is entered into a tri-state type inverter (104). An output portion of this inverter is connected via a delay path (105) to an input portion of an operational a... | 06/07/2005 |
| 6903607 | Operational amplifier An operational amplifier has a differential amplifier stage comprising a pair of first PMOS transistors for inputting signals, which are arranged between a positive voltage supply coupled with a first constant current source and a negative voltage supply, wherein se... | 06/07/2005 |
| 6885532 | Current detection and overcurrent protection for transistors in pulse-width modulation amplifier A current detection circuit applicable to a switching circuit using switching transistors to supply a prescribed load current to a load, comprises a sample-hold capacitor for temporarily holding a terminal voltage of the switching transistor that is turned on, and a... | 04/26/2005 |
| 6859096 | Class D amplifier A detecting circuit (REFH, CM11, LA1, TN1, RN1) which detects an overcurrent flowing through a power-MOS transistor (401) in an output stage to output a first signal (ITN1) is disposed in a first driving circuit (303H... | 02/22/2005 |
| 6847059 | Semiconductor input protection circuit A lateral PNP transistor PB and a lateral NPN transistor NB are serially connected between an input terminal and a reference potential (ground potential). In the transistor PB, a diode D1 is formed. In the transistor NB, a diode D3 is formed. W... | 01/25/2005 |
| 6791405 | Triangular wave generating circuit used in a Class-D amplifier The integrating circuit of the triangular wave generating circuit includes an operational amplifier and a capacitor. Switch elements are alternatively turned ON and capacitors are alternatively recharged by the currents flowing in constant-current circuits thus obta... | 09/14/2004 |
| 6788792 | Device for amplitude adjustment and rectification made with MOS technology An amplitude adjustment device such as an amplitude compression device and amplitude expansion device is basically configured by a PWM modulator, a demodulator and an amplitude detector. Herein, the PWM modulator effects pulse-width modulation on an input signal to ... | 09/07/2004 |
| 6778011 | Pulse-width modulation circuit and power amplifier circuit A pulse-width modulation circuit comprises a comparator having hysteresis characteristics of positive feedback, and an integrator, whose integrated output is compared with an input signal to produce a pulse-width modulation (PWM) signal having an advanced phase char... | 08/17/2004 |
| 6724333 | Digital-to-analog converter There is provided a D/A converter that is free from a variation in the voltage width of 1 LSB between more significant bits and less significant bits of data for conversion due to variations in characteristics of resistors, transistors, etc. to thereby ensure a high... | 04/20/2004 |
| 6707337 | Self-operating PWM amplifier Differential integrator circuit integrates a differential between a difference between a signal supplied from a first signal source and a feedback signal of amplifier output and a difference between a signal supplied from a second signal source and a feedback signal... | 03/16/2004 |
| 6703958 | Analog-to-digital converter A highly efficient analog-to-digital (A/D) converter circuit that converts an external analog signal sequentially generated from an external analog signal source into an n-bit digital data signal (n is an integer equal to or more than two) includes a digi... | 03/09/2004 |
| 6696891 | Class D amplifier A class D amplifier includes: an integrating circuit (1) which integrates an input signal; a flash A/D converter (2) which A/D converts an output signal of the integrating circuit; a waveform converting circuit (3) which produces a PWM signal based on an ... | 02/24/2004 |
| 6600350 | Power-on/off reset circuit A power-on/off reset circuit comprises a capacitor, a first transistor, a second transistor, a first current mirror circuit, a second current mirror circuit, and an inverter. In a power-on mode where the source voltage gradually increases in level, the ca... | 07/29/2003 |
| 6509856 | Digital-to-analog converter The present invention provides a high-accuracy and multi-bit D/A converter which can be produced using a CMOS process. A resistor string is formed of a plurality of resistors connected in series. A switch matrix has switch strings each formed of switches ... | 01/21/2003 |
| 6448856 | Electronic volume circuit An electronic volume circuit is provided, which can be driven by a single power source and can therefore be formed by an LSI that can be fabricated in a simple manner using an oxide film and a junction process for a single power source. A first amplifying... | 09/10/2002 |
| 6445320 | A/D conversion apparatus An A/D conversion apparatus is provided, which is capable of securing a wide dynamic range of A/D conversion with a simple construction through suitably switching the input gain of the input analog signal between predetermined levels. An input gain contro... | 09/03/2002 |
| 6437719 | Delta-sigma modulator for power amplification of audio signals A delta-sigma modulator for use in power amplification of audio signals is configured by an integration circuit, a 1-bit quantizer, an output inversion inhibitor circuit, a delay circuit, and an adder. An analog signal is supplied to the integration circu... | 08/20/2002 |
| 6428671 | Method and apparatus for electro-coagulation printing and electrode control unit An electro-coagulation printer uses an electrode control unit to drive electrodes which are aligned in proximity to a rotation drum having a conductive ink film on its surface. The electrodes are respectively electrified to partially coagulate the conduct... | 08/06/2002 |
| 6111532 | Waveform shaper and sigma-delta D/A converter There are provided a waveform shaper that shapes a waveform of a one-bit data signal obtained by subjecting an input data signal to sigma-delta modulation, to generate an output data signal, and a sigma-delta D/A converter incorporating the waveform shape... | 08/29/2000 |
| 6061279 | Delay circuit for analog signals A delay circuit is provided, which is capable of eliminating the influence of noise of low frequency as disturbance. A plurality of memory cells including a plurality of capacitors store an analog signal as an input signal by storing charge of the input s... | 05/09/2000 |
| 6018262 | CMOS differential amplifier for a delta sigma modulator applicable for an analog-to-digital converter An analog-digital converter includes a ƊΣ modulator, a digital filter, a high-pass filter and a multiplier which are connected in series. Analog input is converted into serial-bit strings by the ƊΣ modulator, for which gain `1/A` is set. The digital f... | 01/25/2000 |
| 5982204 | Information-discriminating circuit An information-discriminating circuit has a biasing device that superposes bias voltage on an input signal, and a comparator that discriminates information by comparing an output signal from the biasing device with a threshold value. The difference betwee... | 11/09/1999 |
| 5946608 | Mixer circuit A mixing circuit that mixes a plurality of input signals are provided. A plurality of input terminals receive the input signals, respectively. A plurality of first resistors each providing input resistance each have one end thereof connected to a correspo... | 08/31/1999 |
| 5939931 | Driving circuit having differential and H-bridge circuits for low voltage power source A driving circuit has first and second output terminals for connection with a load, for supplying the load with a constant voltage changing in polarity at predetermined timing, through the output terminals. A bridge circuit has first and second output nod... | 08/17/1999 |
