Reducing clock skew between clock signals of first and second hearing devices
AssigneeGN Hearing A/S
InventorMichael Løngaa
Life of this patent
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Abstract
The present disclosure relates in one aspect to methods of adjusting a second system clock frequency of a slave or second device to a first system clock frequency of a first device connectable thereto via a unidirectional or bidirectional wireless data communication link so to reduce clock skew between the first and second system clock frequencies.
Claims23
A method performed by a hearing system, the hearing system comprising a first device and a second device, wherein the first device has a first clock frequency, wherein the second device has a second clock frequency, the method comprising:
- receiving data by a data communication interface of the second device, wherein the data is transmitted from the first device via a wireless communication link between the first and second devices;
- processing the data, by the second device, to obtain a first digital audio stream;
- writing digital audio samples of the first digital audio stream to a buffer of the second device;
- reading out from the buffer the digital audio samples of the first digital audio stream based on the second clock frequency of the second device;
- and
- changing the second clock frequency based on an overflow event and/or an underflow event of the buffer of the second device.
A hearing system comprising:
- a first device comprising a first microphone arrangement, a first digital processor, a first system clock generator configured to supply a first clock signal at a first clock frequency, and a first data communication interface;
- and
- a second hearing device comprising a second digital processor, a second system clock generator configured to supply a second clock signal with a second clock frequency, and a second data communication interface, wherein the second clock frequency is adjustable;
- wherein the first data communication interface is configured to transmit data for receipt by the second data communication interface;
- wherein the second device is configured to:
- process the data to obtain a first digital audio stream;
- write digital audio samples of the first digital audio stream to a buffer of the second device;
- read out from the buffer the digital audio samples of the first digital audio stream based on the second clock signal;
- and
- change the second clock frequency of the second clock signal based on an overflow event and/or an underflow event of the buffer.
A hearing device comprising:
- an clock generator configured to supply a clock frequency, wherein the clock frequency is adjustable;
- a digital processor configured to operate based on the clock frequency;
- and
- a data communication interface configured at least for receipt of data through a wireless communication link;
- wherein the hearing device is configured to:
- process the data to obtain a first digital audio stream;
- write digital audio samples of the first digital audio stream to a buffer;
- read out from the buffer the digital audio samples of the first digital audio stream based on the clock frequency;
- and
- change the clock frequency based on an overflow event and/or an underflow event of the buffer.
Dependencies are inferred from the claim text.