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"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
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| Number | Title | Issue Date |
| 8139772 | System and method for estimating channel condition based on filtered pilot energy signal A receiver may estimate a channel condition based on a difference between a pilot energy signal and a filtered pilot energy signal. The receiver may further switch to a stereophonic mode when both the difference and an energy level of the pilot energy signal satisfy... | 03/20/2012 |
| 8139771 | System and method for switching a mode of a receiver using block estimation A system and method for switching a mode of a receiver between a monophonic and stereophonic mode is disclosed. The method can include generating a residual signal indicative of a noise level associated with a pilot energy signal, calculating a residual block energy... | 03/20/2012 |
| 8014531 | Stereo/monaural switching circuit and integrated circuit having the same An adder mixes an L-channel sound signal and an R-channel sound signal with each other and then outputs a mixed signal. A switching unit performs a switching operation such that, if power is being supplied to loudspeaker amplifiers, the L-channel sound signal and th... | 09/06/2011 |
| 7864962 | System and method of routing audio signals to multiple speakers A method and system for utilizing multiple speakers in a portable electronic device is disclosed. The method includes receiving an input at a user interface of a portable electronic device, switching a first and second speaker in a stereo configuration to a mono con... | 01/04/2011 |
| 7751571 | Sound signal processor and method for processing sound signal using the same A sound signal processor and a method for processing a sound signal using the same enables the elimination of a plop noise generated in the course of a sound mode checking operation. The sound signal processor receives a sound intermediate frequency (SIF) signal and... | 07/06/2010 |
| 7457420 | Method and system for detecting signal modes in a broadcast audio transmission A Japanese BTSC audio broadcast signal has three modes of transmission: mono, stereo, or dual mono. The control channel centering at 3.5 fH is one of the three channels in the J-BTSC signal, and contains information to indicate to the decoder which one of the three ... | 11/25/2008 |
| 7406008 | Recording medium and system for recording and reproducing the recording medium using control information that represents the number of sets of information composing the multiplexed audio information A recording medium has a first recording area on which multiplexed audio informations are recorded as sets of one or more information units, a second recording area on which control information for controlling recording of the multiplexed audio informations are reco... | 07/29/2008 |
| 7369666 | Audio reproducing system High and low frequency components Cn1, Cn2 are generated by causing a center channel audio signal Cn to pass through a high-pass filter HPF and a low-pass filter LPF, and the high frequency component Cn1 is supplied to the center cha... | 05/06/2008 |
| 7359686 | Radio-frequency amplifier system A device for measuring voltage levels includes a root mean square (RMS) detector. The RMS detector includes a linear multiplier, a log converter, a low-pass filter and a temperature compensator. The linear multiplier multiplies a voltage of an input signal by the vo... | 04/15/2008 |
| 7359066 | Electro-optical measurement of hysteresis in interferometric modulators Disclosed herein are methods and apparatus for testing interferometric modulators. The interferometric modulators may be tested by applying a time-varying voltage stimulus and measuring the resulting reflectivity from the modulators. ... | 04/15/2008 |
| 7340272 | Mobile communication terminal having a three-dimensional surround sound effect and its control method A mobile communication terminal with three-dimensional surround-sound effect system has a data processing section for coding and modulating a transmitting signal or demodulating and decoding a receiving signal, and an audio processing section for reproducing an audi... | 03/04/2008 |
| 7330551 | Apparatus and method for controlling input signal level Disclosed are an apparatus and a method for controlling an input signal level. The apparatus for controlling an input signal level according to the present invention includes: a memory for storing a current input signal level, a previous input signal level, a maximu... | 02/12/2008 |
| 7319763 | Power amplification for parametric loudspeakers A power amplifier for a parametric loudspeaker system which utilizes switch-mode power conversion to increase efficiency. The power amplifier is configured to coordinate the switching frequency of the amplifier with the carrier frequency of the parametric loudspeake... | 01/15/2008 |
| 7313240 | Noise reduction in a stereo receiver comprising an expander A FM broadcast compander system is combined with a conventional denoising system suited for FM receiver, wherein a noise indicator is determined by a subtraction of the conventionally transmitted difference signal Ud(z) from the additionally transmitted d... | 12/25/2007 |
| 7292649 | 3G radio A homodyne receiver is provided for receiving GSM and UMTS transmissions. The receiver may also be used for other transmission schemes. The receiver includes an electronically reconfigurable low pass filter and an off set generator for providing DC offset correction... | 11/06/2007 |
| 7292697 | Audio reproducing system High and low frequency components Cn1, Cn2 are generated by causing a center channel audio signal Cn to pass through a high-pass filter HPF and a low-pass filter LPF, and the high frequency component Cn1 is supplied to the center cha... | 11/06/2007 |
| 7292694 | Noise reduction in a stereo receiver A method to denoise a stereo signal which comprises a stereo sum signal (Us(z)) and a stereo difference signal (Ud(z)), wherein a stereo to mono blending on basis of an attenuation of the stereo difference signal (Ud(z)) is performed... | 11/06/2007 |
| 7270554 | Audio jack with plug or head set identification circuit A jack (90) typically mounted in an aircraft seat is adapted for use with a variety of headset types. A jack has sockets (92, 93, 94) accepting any of several different types of plugs associated with different types of noise cancellation headsets or av... | 09/18/2007 |
| 7251332 | Portable audio devices The components of a portable personal audio system include first and second audio signal source devices, such as an MP3 player (14) and telephone (16). These are connected via respective leads (12) to a control and switching stage (22), a... | 07/31/2007 |
| 7239710 | Stereo radio receiver with noise suppression For the purpose of largely suppressing the noise pulses caused in a stereo radio receiver in the reception signal, particularly by the ignition system of a motor vehicle, a digital field strength signal representing the analog field strength signal is produced for e... | 07/03/2007 |
| 7187775 | Audio signal recording apparatus When a plug of a monaural microphone is connected to an external microphone input section, a right channel terminal is connected to a GND terminal, and a voltage Vdet will be a GND potential. A DC voltage detection section detects this GND potential, and outputs, fo... | 03/06/2007 |
| 7162038 | Audio source selection circuit Audio source selection circuit (QW) for an audio signal processor with inputs for source signals (F1, F2, NA, NB) provided by at least one source (Q1, Q2), with a processing device (V) which forms pairs of signals from the source signals,... | 01/09/2007 |
| 7133527 | Stereodecoder An arrangement for decoding a stereo multiplex signal, comprising a baseband sum signal (L+R), a difference signal (L−R) which is amplitude-modulated on a suppressed sub-carrier and a pilot signal having a frequency located between the frequency bands of said sum ... | 11/07/2006 |
| 7110549 | Noise reduction in a stereo receiver A method to denoise a stereo signal comprising a stereo sum signal and a stereo difference signal, performs a frequency selective stereo to mono blending based on the masking effect of the human auditory system. Therefore, a stereo signal noise reducer, comprising a... | 09/19/2006 |
| 7088827 | Reconfigurable speaker system A reconfigurable speaker system for producing sound in response to at least one of right and left channel audio signals generated by an audio source. The speaker system can be configured by the user to simultaneously reproduce right and left channel audio informatio... | 08/08/2006 |
| 7043034 | Loudspeaker with single or dual channel input selector and lockout A dual purpose loudspeaker incorporating at least two audio signal inputs and at least one switch is adapted to receive and reproduce either a single audio signal input or two audio signal inputs according to the position of the switch. A switch slide mechanically l... | 05/09/2006 |
| 6961591 | Hand held telephone set and audio processing method A handheld telephone set used by connecting a dual-ear mount type or single-ear mount type earphone that automatically sets an optimal signal level of an ambient sound according to the earphone type used, provided with: a telephone set main body unit, a detection de... | 11/01/2005 |
| 6950626 | Receiver having retransmission function A receiver having a retransmission function is provided for alleviating a degradation in the S/N ratio in an FM radio wave for retransmitting an audio signal extracted from a digital broadcasting radio wave even if a receiving situation deteriorates. When the receiv... | 09/27/2005 |
| 6914987 | Audio amplifier with voltage limiting in response to spectral content Audio signals are reproduced with consistent perception of total harmonic distortion even with varying spectral content of a particular audio signal without separately limiting different frequency bands within the audio signal. A distortion threshold representative ... | 07/05/2005 |
| 6902113 | Selection of colors for color bar codes A method for color bar codes includes selecting N bar code colors for a color bar code system to be generally distinct from each other given the range of colors that a camera reader is expected to produce given at least one environmental condition in which the camer... | 06/07/2005 |
| 6748085 | Computer system with a common audio input for its audio circuitry A portable computer system includes an audio circuit and a common audio input socket coupled to the audio circuit. This audio circuit has a controller and two amplifiers. Two types of external audio devices is to be coupled to the common audio input socket. The cont... | 06/08/2004 |
| 6711268 | Automatic stereo/monaural headphone A stereo headphone employing a standard stereo headphone plug is adapted for automatically hearing a monaural signal at both earpieces, when accessing a typical monaural source. In the first embodiment of the invention, an impedance element couples the signal from a... | 03/23/2004 |
| 6707917 | Monaural and stereo audio signal control system A monaural and stereo audio signal control system for use in cable-signal set-top boxes selects signal processing paths as a function of the monaural and stereo nature of the incoming audio component of the television signal and an indication as to whether the audio... | 03/16/2004 |
| 6658116 | Stereo radio receiver A stereo radio receiver has a channel separation stage for setting an optimal channel separation of the left audio channel from the right audio channel, even under sufficient receiving field strength following a time of multipath reception for the duratio... | 12/02/2003 |
| 5974153 | Method and system for sound expansion Monaural inputs are accepted for presentation to a pair of speakers. The output sound image from that pair of speakers is such that a listener will perceive that the sound is stereo and that certain sounds come from a non-existent center speaker and that ... | 10/26/1999 |
| 5920632 | Apparatus for continuously switching a demodulator from stereo operation to mono operation, and vice versa In a stereo decoder, channel separation takes place with the aid of a demodulator to acquire signals for stereo operation. At low received field strength there is a continuous switchover to mono operation for each channel in the demodulator. For this purp... | 07/06/1999 |
| 5784465 | Stereo receiver The invention is directed to reducing noises of a low density without causing the listener to feel a sense of incongruity. A received signal is subjected to frequency discrimination. The sound signals of the right-channel and the left-channel are separate... | 07/21/1998 |
| 5771293 | Switching arrangement for mobile radio receivers In the case of a switching arrangement for mobile radio receivers having a device for adjusting the stereo playback portion relative to the mono playback portion as a function of multipath effects, the resetting time of mono to stereo playback is a functi... | 06/23/1998 |
| 5701345 | Multipath interference reduction system and method A multipath interference reduction system and method for smoothly reducing noise associated with FM stereo signal reception with an adjustable blend. The system includes a peak detector for detecting noise present in the received signal. When the detected... | 12/23/1997 |
| 5699432 | Circuit for mobile radio receivers In a circuit for mobile radio receivers with a device for setting the stereo reproduction portion relative to the mono reproduction portion as a function of changes in the reception field strength, the setting time for the transition from stereo to mono r... | 12/16/1997 |
