Abrégé

A rotatable coupling for audio cables is shown having a stator and a rotor divining an electrical rotary interface (301) for providing continuous connection between audio cables. A protective stator housing (304) retains the stator and a protective rotor housing (305) retains the rotor. A rolling-element bearing (306) with an inner race and an outer race allows the protective housings to axially rotate.

Classes IPC  ?

• H01R 39/00 - Collecteurs de courant rotatifs, distributeurs ou interrupteurs
• H01R 39/64 - Dispositifs pour le captage ininterrompu du courant
• H01R 39/28 - Contacts à rouleauContacts à rotule
• H01R 24/58 - Contacts espacés le long de l'axe longitudinal d’engagement
• H01R 13/627 - Fixation du type à action brusque
• H01R 107/00 - Quatre pôles ou plus

Abrégé

A rotatable coupling for audio cables is shown having a stator and a rotor divining an electrical rotary interface (301) for providing continuous connection between audio cables. A protective stator housing (304) retains the stator and a protective rotor housing (305) retains the rotor. A rolling- element bearing (306) with an inner race and an outer race allows the protective housings to axially rotate.

Classes IPC  ?

• H01R 39/64 - Dispositifs pour le captage ininterrompu du courant
• H01R 24/58 - Contacts espacés le long de l'axe longitudinal d’engagement
• H01R 13/627 - Fixation du type à action brusque

Abrégé

The thermionic valve tester (10) has a casing (11) and three valve sockets (12) each of which is adapted to receive and has terminals for connection with the electrode pins of different types of thermionic valves. The thermionic valve tester (10) also has a display (13) comprising a series of LED lights, three user operated buttons (16), and a single power supply socket or terminal (14) which supplies power to all components of the valve tester and which is adapted for connection to a low voltage DC power supply lead. Internally, the thermionic valve tester (10) has a plurality of voltage regulators each with a switchable connection to at least one valve electrode terminal of the valve sockets (12) and a memory in which is stored the tests and the performance criteria for different types of thermionic valves. A controller controls connection of the voltage regulators with the terminals of the valve sockets (12) and the voltages applied to the terminals and also monitors current flow in the thermionic valve during testing. The thermionic valve tester is a small, portable unit which is simple and easy to use and enables people, other than qualified specialists and audio technicians, to regularly monitor valve performance.

Classes IPC  ?

• G01R 31/25 - Test de tubes à vide
• G01R 19/00 - Dispositions pour procéder aux mesures de courant ou de tension ou pour en indiquer l'existence ou le signe

Abrégé

The thermionic valve tester (10) has a casing (11) and three valve sockets (12) each of which is adapted to receive and has terminals for connection with the electrode pins of different types of thermionic valves. The thermionic valve tester (10) also has a display (13) comprising a series of LED lights, three user operated buttons (16), and a single power supply socket or terminal (14) which supplies power to all components of the valve tester and which is adapted for connection to a low voltage DC power supply lead. Internally, the thermionic valve tester (10) has a plurality of voltage regulators each with a switchable connection to at least one valve electrode terminal of the valve sockets (12) and a memory in which is stored the tests and the performance criteria for different types of thermionic valves. A controller controls connection of the voltage regulators with the terminals of the valve sockets (12) and the voltages applied to the terminals and also monitors current flow in the thermionic valve during testing. The thermionic valve tester is a small, portable unit which is simple and easy to use and enables people,other than qualified specialists and audio technicians,to regularly monitor valve performance.

Classes IPC  ?

• G01R 31/25 - Test de tubes à vide

Abrégé

The audiovisual teaching apparatus (2), which is large enough for demonstration purposes before a group of students, has a frame (6) on which is mounted a board (4). The front surface of the board (4) includes an area (5) treated so as to function as a whiteboard surface on which standard dry-maker pens can be used to removably write and draw on the surface. The whiteboard surface (5) is pre-printed with a plurality of musical staves (8) and has an array of substantially parallel conductive tracks aligned with the lines and spaces of the musical staves (8). The conductive tracks are connected to sound reproduction apparatus and a hand-held wand (24),which includes a localised antenna,is adapted to select an individual line or space of the musical stave (8) so that the selected note is played by the sound reproduction apparatus. The audiovisual teaching apparatus provides greater freedom of movement for a teacher,in comparison to previous teaching apparatus.

Classes IPC  ?

• G06F 3/046 - Numériseurs, p. ex. pour des écrans ou des pavés tactiles, caractérisés par les moyens de transduction par des moyens électromagnétiques
• G06F 3/047 - Numériseurs, p. ex. pour des écrans ou des pavés tactiles, caractérisés par les moyens de transduction utilisant un ensemble de fils conducteurs, p. ex. des fils conducteurs croisés
• G09B 15/02 - Claviers ou moyens similaires pour l'indication des notes
• G09B 15/04 - Claviers ou moyens similaires pour l'indication des notes avec sources sonores

Produits et services

Audio equipment, namely, pre-amplifiers, analog-to-digital converters, digital-to-analog converters, microphone pre-amplifiers, musical instrument amplifiers, audio amplifiers, bass amplifiers, electrical pickups for use with musical instruments, electronic sound pickup for guitars and basses; amplifiers; guitar amplifiers; electronic control circuits and circuit boards for use with audio equipment and amplifiers; electronic components for audio equipment, namely, amplifiers, for guitars and other musical instruments; high fidelity audio amplifiers; electronic components for high-fidelity equipment, namely, electronic components for audio amplifiers; computer programs and software for the processing of amplifier signals, for testing and diagnosis of amplifiers to identify problems in performance and functionality and to control and improve audio equipment and sound quality

Abrégé

Controlling the performance of the thermionic tube (102) having a cathode (103), a plate (104) and a grid (105) is disclosed. The tube is configured to provide amplification of an audio derived signal (106) and is arranged to apply a grid bias voltage to the grid. The absence of an input audio signal is detected whereafter output current between cathode and plate is measured to identify actual output current. The actual output current is compared against a preferred output current and the grid bias voltage is adjusted so as to bring the actual output current value towards the preferred output current value.

Classes IPC  ?

• H03F 3/68 - Combinaisons d'amplificateurs, p. ex. amplificateurs à plusieurs voies pour stéréophonie