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| Number | Title | Issue Date |
| 6356872 | Method and apparatus for storing digital audio and playback thereof A data conversion device is provided for storing digital data in a DAT (332) at a 16-bit word length and then recovering the data at a 24-bit word length with an overall reduction in truncation noise that would be inherently associated with data at the 16... | 03/12/2002 |
| 6212273 | Full-duplex speakerphone circuit including a control interface A full-duplex communication device includes a transmit channel, a receive channel, and echo cancellers connected between the transmit channel and the receive channel. A plurality of control parameters and status indicators are defined for both channels. T... | 04/03/2001 |
| 6121811 | Variable time delay circuit and method A high resolution variable time delay circuit is disclosed. In one embodiment, a current digital to analog converter (DAC) is used to sequentially charge two capacitors having similar capacitance construction. A threshold level capacitor provides the thre... | 09/19/2000 |
| 6096960 | Period forcing filter for preprocessing sound samples for usage in a wavetable synthesizer A nonperiodic waveform is forced to a periodic character to facilitate looping of the waveform without introducing audible, and thus objectionable, sound artifacts. Nonperiodic waveforms are typically nonperiodic due to the presence of nonharmonic high fr... | 08/01/2000 |
| 6091824 | Reduced-memory early reflection and reverberation simulator and method Early reflection and reverberation processing using a decimating filter simulates the high frequency attenuation of an actual physical and acoustical environment and advantageously reduces the memory storage and computational burden of the early reflectio... | 07/18/2000 |
| 6088461 | Dynamic volume control system A dynamic volume control system in an audio processor uses gain and delay signals from a digital signal processor to dynamically control the user-selected volume of the audio processor. The digital signal processor executes audio signal processing operati... | 07/11/2000 |
| 5960401 | Method for exponent processing in an audio decoding system A method of processing exponent data in an audio decoder. A first block of audio data is received including encoded exponent data. The encoded exponent data is packed into packed encoded words and stored in memory. Exponents are generated from the packed ... | 09/28/1999 |
| 5923273 | Reduced power FIR filter A reduced power FIR filter may be utilized as the digital decimation filter for a delta sigma ADC. The FIR filter utilizes a serial bit stream which is part of the control path of the filter. Thus, operations of the circuitry which comprises the filter ma... | 07/13/1999 |
| 5917917 | Reduced-memory reverberation simulator in a sound synthesizer A sound or music synthesizer includes a reverberation simulator having a substantially reduced volatile storage, random access memory, or buffer size in comparison to conventional reverberation simulators by decimating the sound signal prior to applying t... | 06/29/1999 |
| 5886658 | Serial port interface system and method for an analog-to-digital converter A novel serial port interface system and method are disclosed. The serial port interface system achieves a three-pin interface mode with only a serial data input pin, a serial data output pin, and a serial clock pin by allocating a bit in an on-chip regis... | 03/23/1999 |
| 5818370 | Integrated CODEC with a self-calibrating ADC and DAC A calibrated digital-to-analog converter (DAC) is provided that includes a DAC having an interpolation circuit (40) and delta-sigma converter (44). The output of the delta-sigma converter (44) is input to a one-bit DAC (48) and the output thereof filtered... | 10/06/1998 |
| 5777909 | High pass filter with coefficient switching to improve settling time A high pass filter is provided utilizing a digital filter with coefficients that can be switched to provide for two responses, a fast response and a slow response. A first response is provided by an accumulator block (38) disposed between the output and a... | 07/07/1998 |
| 5777912 | Linear phase finite impulse response filter with pre-addition A linear phase FIR filter includes a multiplication/accumulator engine which is operable to receive the multi-level data stream and multiply it by predetermined filter coefficients. The coefficients are symmetrical to allow a pre-addition operation wherei... | 07/07/1998 |
| 5748040 | Fully differential high gain cascode amplifier A very high gain cascode amplifier includes a cascoded differential structure wherein a cascoded N-channel leg comprised of two series connected transistors (56) and (58) are connected between an output node (30) and ground with a corresponding P-channel ... | 05/05/1998 |
| 5698805 | Tone signal generator for producing multioperator tone signals The present invention relates to a tone signal generator. The tone signal generator includes first tone signal generation means for producing a dual-tone, multi-frequency ("DTMF") audio signal; second tone signal means for producing a plurality of non-DTM... | 12/16/1997 |
| 5665929 | Tone signal generator for producing multioperator tone signals using an operator circuit including a waveform generator, a selector and an enveloper A frequency modulation (FM) tone signal generator for generating a FM tone signal is disclosed. The tone signal generator includes a waveform generator having a plurality of wave tables, a selector and an enveloper. The waveform generator furnishes a wave... | 09/09/1997 |
| 5644257 | Sampling circuit charge management The detrimental nonlinear charging currents from an analog input signal through an anti-aliasing filter into a sampling circuit can be minimized by using primary and secondary inputs to the sampling circuit. The secondary input is turned on before the pri... | 07/01/1997 |
| 5644308 | Algorithmic analog-to-digital converter having redundancy and digital calibration An algorithmic converter system includes an algorithmic converter having a loop gain substantially less than two for converting an analog input signal to a redundant digital code; and a digital computation unit for converting the redundant digital code to... | 07/01/1997 |
| 5644098 | Tone signal generator for producing multioperator tone signals A frequency modulation (FM) tone signal generator for generating a FM tone signal is disclosed. The tone signal generator includes a waveform generator having a plurality of wave tables, a selector and an enveloper. The waveform generator furnishes a wave... | 07/01/1997 |
| 5642078 | Amplifier having frequency compensation by gain degeneration An amplifier having an inverting and a non-inverting input and at least one output is compensated by dynamically varying the transconductance of a gain stage in accordance with the gain of the output stage of the amplifier. The amplifier comprises a gain ... | 06/24/1997 |
| 5608676 | Current limited current reference for non-volatile memory sensing A non-volatile memo includes the reference cells programmed to opposite logic states whose outputs are combined and then equally divided to provide a reference signal to a sense amplifier which is one half of the sum of the signals from a high conductivit... | 03/04/1997 |
| 5594612 | Analog-to-digital converter with digital linearity correction A analog calibration signal including at least one frequency component is generated by a very pure signal source, such as a digital oscillator and a digital-to-analog converter (DAC) that has been calibrated to be ultralinear. The analog calibration signa... | 01/14/1997 |
| 5594442 | Configuration programming of a digital audio serial port using no additional pins A stereo digital-to-analog converter is able to operate in an 8 pin package yet to operate under a variety of serial data input formats. The normal de-emphasis pin can be used for receiving a static de-emphasis signal, an external serial clock, or program... | 01/14/1997 |
| 5594439 | Diagnosing problems in an electrical system by monitoring changes in nonlinear characteristics Abnormal changes in the non-linear characteristics of electronic components are an indication of abnormal conditions such as impending component or system failure. To detect such abnormal changes in nonlinearity, an electronic circuit is subjected to a ca... | 01/14/1997 |
| 5590065 | Digital decimation filter for delta sigma analog-to-digital conversion with reduced hardware compelexity A decimation filter includes a plurality of integration stages, at least one decimation stage, and a plurality of differentiation stages followed by a FIR filter. At least one of the integration stages, the decimation stage, and the differentiator stages,... | 12/31/1996 |
| 5585763 | Controlled impedance amplifier An amplifier with controlled output impedance utilizing current and voltage feedback to set gain and output impedance is disclosed. The voltage feedback is provided by feedback resistor connected from the output to the inverting input. The current feedbac... | 12/17/1996 |
| 5583501 | Digital-to-analog converter with digital linearity correction Digital linearity correction is obtained by generating a digital calibration signal having at least one frequency component, converting the digital calibration signal to an analog signal, and detecting distortion in the analog signal generated from the ca... | 12/10/1996 |
| 5579247 | Method and apparatus for decreasing the interference and noise sensitivity of a ratiometric converter type of circuit A ratiometric converter receives an external sense signal and external reference signal and provides an output signal which is proportional to the sense signal and inversely proportional to the reference signal. Electromagnetic interference and noise coup... | 11/26/1996 |
| 5574475 | Signal driver circuit for liquid crystal displays The present invention relates to a signal driver circuit for driving a liquid crystal display panel. The signal driver circuit provides level shifting within the circuit to lower the power consumption of a liquid crystal display module while still providi... | 11/12/1996 |
| 5541599 | Data independent loading of a reference in a discrete time system A 1-bit discrete time digital-to-analog converter which samples a reference voltage and ground potential onto two charging capacitors during a sample phase of each sampling period, and which transfers the charge on one of the capacitors, as determined by ... | 07/30/1996 |
| 5528239 | Low noise transmission of output data from a delta-sigma modulator The output gates of a delta-sigma modulator can generate i(t) transient signal in the power supply lines of a delta-sigma modulator. These i(t) spikes, which would otherwise produce non-linearities which can be coupled into the frequency band of interest ... | 06/18/1996 |
| 5477481 | Switched-capacitor integrator with chopper stabilization performed at the sampling rate A switched-capacitor integrator with chopper stabilization performed at the sampling rate virtually eliminates the flicker noise and any low frequency interference generated by the amplifier. The integrator samples the input and then passes the sampled in... | 12/19/1995 |
| 5475323 | Amplifier with input common mode compensation An integrated circuit apparatus and method is provided for utilizing voltage dividers and differential amplifiers. An apparatus and method for dividing a voltage with a resistor voltage divider and for employing the voltage divider in an integrated circui... | 12/12/1995 |
| 5440305 | Method and apparatus for calibration of a monolithic voltage reference A method and apparatus for calibration of errors in a monolithic reference includes a bandgap voltage reference (50) that outputs an untrimmed voltage and a temperature voltage. The untrimmed voltage and temperature voltage are input to a delta-sigma A/D ... | 08/08/1995 |
| 5397944 | Dense offset calibration circuitry and method An audio mixer circuit on an integrated circuit chip performs a calibration operation on power up which calibrates out most of the offset voltages of the operational amplifiers used in the mixer. The calibration logic includes a shared calibrate circuit w... | 03/14/1995 |
| 5376936 | One-bit switched-capacitor D/A circuit with continuous time linearity A modified lossy integrator digital-to-analog converter includes an amplifier (46) that receives an input on a summing node (48) and provides an output on a node (52). A feedback capacitor (50) is disposed across the input and output and has an output swi... | 12/27/1994 |
| 5351050 | Detent switching of summing node capacitors of a delta-sigma modulator The thermal noise generated through the feedback capacitor of a delta-sigma modulator is attenuated by transferring a reference voltage through the capacitor in two separate steps during each sampling period. This permits a reduction in the size of the fe... | 09/27/1994 |
| 5339067 | Integrated voltage divider and circuit employing an integrated voltage divider An apparatus and method is provided for dividing a voltage with a resistor voltage divider and for employing the voltage divider in an integrated circuit. The resistor voltage divider utilizes inaccessible compensation taps that are placed between nonline... | 08/16/1994 |
| 5319319 | Low drift resistor structure for amplifiers A low drift integrated circuit resistor structure has a forced high end and a forced low end. A sense high connection is located proximate to the force high connection, and a sense low connection is located proximate to the force low connection. The struc... | 06/07/1994 |
| 5274375 | Delta-sigma modulator for an analog-to-digital converter with low thermal noise performance An analog-to-digital converter includes a two-bit delta-sigma modulator. The delta-sigma modulator is comprised of a first stage integrator (10) that feeds a noise shaping circuit (18). The output of the noise shaping circuit (18) is input to a two-thresh... | 12/28/1993 |
