Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Kazuki Adachi

Tetsuro Sugioka

Kiyomi Kimura

Tsuyoshi Takayama

Yoshihiro Moriie

Akihiro Fuke

Takuma Adachi

Kosei Fujisaka

Hiroaki Nakayama

Kiyomi Okamoto

Tetsurou Sugioka

A sink device is bi-directionally communicably connected to the source device. The sink device includes a first memory, and a controller. Stored in the first memory is a plurality of pieces of audio format information including information representing an audio format that the sink device can process. The controller selects, from among the plurality of pieces of audio format information stored in the first memory, one piece of audio format information corresponding to receiver format information representing an audio format that a receiver device connected to the sink device can process. The controller then outputs the selected audio format information to the source device.

Sink device

The potential of a smoothing capacitor for a speaker is smoothly changed by controlling the potential with use of a PWM signal and switching between outputting the PWM signal and an actual audio signal, thereby suppressing a pop sound. The scale of circuitry is reduced and cost is lowered by implementing a PWM circuit in a one-chip microcontroller. Noise is eliminated by outputting a pulse that has been divided in the PWM signal generation stage.

Audio signal output control device that suppresses pop sound

The capacitor structure includes a first electrode having a plurality of teeth protruding in a comb shape from an electrode base of a first electrode line and a second electrode having a plurality of teeth protruding in a comb shape from an electrode base of a second electrode line, both formed in a first wiring layer. The first and second electrodes face each other with their teeth interdigitated with each other via a dielectric. At least one of the teeth of the first electrode is electrically connected with a third electrode line formed in a second wiring layer.

Capacitor structure

In a tone output device, an oscillatoroutputs a clockthat is emitted by a crystal resonator. A multiplication circuitoutputs a clockthat is generated by multiplying the clock. A timing control circuitoutputs a timing signalgenerated based on the clockfor operations of a CPU. The CPUoperates in sync with the timing signal. The DA converteroperates in sync with a signal generated based on the clock. The timing adjustment circuitdetects deviation of the clockfrom the clockresulting from frequency jitter of the clock, and prevents occurrence of clock racing.

Tone output device and integrated circuit for tone output

Growing community of inventors

Kyoto, Japan

Kazuki Adachi