Abstract:
Systems and methods related to digital frequency locked looping to synchronize frequencies between the local signal from a local oscillator and a reference clock signal from a remote oscillator. A reference counter increments its count for every pulse in the reference clock signal. The value in the reference counter is compared to a configurable reference value. Whenever a match between the reference counter value and the reference value occurs, a hit signal is generated and the reference counter value is reinitialized. Concurrent with the above, a feedback counter increments for every pulse from the local signal. When the hit signal is generated, the value in the feedback counter is compared to a configurable feedback value (by subtraction) to generate a difference value. The difference value is then converted to a frequency adjust signal for use in either increasing or decreasing the frequency of the local oscillator. The hit signal also reinitializes the feedback counter.
Abstract:
An improved receiver architecture and method for a wireless transceiver (e.g. for a headphone) is provided whereby the receiver, advantageously, enables the use of only one synthesizer circuit for both the RF-to-IF and IF-to-base band conversion processes which, in turn, provides for lower power consumption. The receiver includes an injection locked local receiver oscillator (Rx LO) which is used for the first mixing stage (i.e. the RF-to-IF conversion). The Rx LO 105 is thereby able to use a high-level harmonic of a relatively low reference frequency signal produced by that synthesizer (e.g. a fractional-N phase locked loop circuit (PLL)). The receiver further includes a tunable Q-enhanced IF filter 110 and complex sub-sampling and mixing down-conversion circuitry for the second conversion stage (i.e. IF-to-baseband conversion). The sampling frequency used for the second conversion stage is a harmonic of the reference frequency derived from the synthesizer (PLL). For example, transceiver channels may be designed on the basis that the RF frequency F R1 is assigned a value of (n±¼)•f s , where the frequency f PLL of the PLL may be chosen to be twice the sub-sampling frequency f s and the frequency f Rx LO of the Rx LO may be nine times the frequency f PLL .
Abstract translation:提供了一种用于无线收发器(例如,用于耳机)的改进的接收器架构和方法,由此接收器有利地仅使用一个合成器电路用于RF至IF和IF至基带频带转换过程,其中 反过来又提供较低的功耗。 接收机包括用于第一混频级(即RF至IF转换)的注入锁定本地接收机振荡器(Rx LO)。 因此,Rx LO 105能够使用由该合成器(例如,分数N锁相环电路(PLL))产生的相对低的参考频率信号的高电平谐波。 接收机还包括可调Q增强IF滤波器110和用于第二转换级(即IF到基带转换)的复数次采样和混合下转换电路。 用于第二转换级的采样频率是从合成器(PLL)导出的参考频率的谐波。 例如,可以基于RF频率F SUB R1分配值(n±¼)f S s S s来设计收发器信道,其中频率f PLL的PLL SUB>可以选择为子采样频率f SUB的两倍,并且Rx LO的频率f RxLO SUB>可以是9倍 频率f PLL PLL。
Abstract:
A wireless communications system and channel-switching method are disclosed herein. A source device and multiple sink devices independently maintain respective counters which track data packet errors. Each device independently switches channels only after its counter reaches a channel-switching threshold. The new channel switched-to is either determined by an indexed ordering of the available channels or by reference to a global clock maintained by each of the devices. Accordingly, all devices quickly arrive at a common channel. The system switches channels only when necessary and resolves quickly to a mutually acceptable channel. Therefore, unnecessary channel switching is minimized and data throughput is optimized.
Abstract:
L’invention concerne un procédé et un appareil électronique de gestion de communication entre un maître canal (tel que des lecteurs audio), des dispositifs de réponse (comme des télécommandes/écouteurs) et, optionnellement, des dispositifs passifs (comme des écouteurs), connectés sans fil dans un réseau audio sans fil. Le maître canal transmet, et le dispositif de réponse reçoit, des signaux audio et de l’information de gestion de réseau. Des moyens de négociation de profils communiquent des profils d’application pour les dispositifs, établissant au moins un profil d’application commun aux dispositifs et désignant un profil sélectionné, lequel profil d’application commun est associé aux dispositifs. Des moyens de sélection de canal choisissent un canal pour les communications, à l’aide d’un choix ordonné de canaux (PCS) obtenu à partir du balayage des canaux pour un canal au repos et de l’ordre des canaux balayés selon la priorité basée sur la qualité du canal. Une commande normalisée et des interfaces d’état établissent l’interopérabilité entre les dispositifs utilisant différents flux de données pour communiquer dans le réseau.
Abstract translation:“发明协调员”,“发明协调员”,“发展协调员”,“发展协调员”,“发展协调员”,“发展协商会”,“ 无线电无线电音频无线电 交通运输管理系统,消费者信息管理系统。 应用社会责任公报,应用程序通讯,应用程序通讯和应用程序通讯协会。 德意志交通运输部门通讯,àl'aide d'un choixordonnéde canaux(PCS)obtenuàpartir du balayage des canaux pour un canal au repos et de l'ordre des canauxbalayésselon lapriorityé baséesur laqualitédu运河。 Une commandenormaliséeet des interfaces d'étatétablissentl'interopérabilitéentre les dispositifs utilisantdifférentsflux dedonnéespour communiquer dans leréseau。
Abstract:
The invention relates to the field of wireless communications and more specifically to a high quality, low power wireless audio system. More specifically, the invention comprises an audio source for receiving audio signals (e.g. music) and audio status information (e.g. song title) from a first external device (e.g. an MP3 player) and transmitting the audio signals and the audio status information over a wireless connection; and at least one audio sink for receiving the audio signals and said audio status information from the audio source and communicating the audio signals and the audio status information to a second external device (e.g. headphones), wherein a specified one of the at least one audio sink receives audio control information (e.g. pause) from the second external device and transmits said audio control information to said audio source via said wireless connection. Among other features, the wireless audio system of the present invention incorporates dynamic channel selection as well as dynamic adjustment of the transmission interval to ensure enhanced audio quality using the lowest possible power.