Audio data receiving apparatus, audio data receiving method, and audio data transmission and receiving system

• US 8,751,026 B2
• Filed: 05/13/2010
• Issued: 06/10/2014
• Est. Priority Date: 06/11/2009
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sato, Teppei, Shiba, Kenji, Suzuki, Satoru
• Primary Examiner(s): Nguyen, Duc
• Assistant Examiner(s): ELJAIEK, ALEXANDER L
• Application Number:
  US12/800,330
• Publication Number:
  US 20100316238A1
• Time in Patent Office: 1,489 Days
• Field of Search: 327/144, 381/300, 386/200, 370/316, 455/39, 455/73, 700/94, 375354-355, 375/376
• US Class Current: 700/94
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 20/10425 by counting out-of-lock events of a PLL
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence

Abstract

An audio data receiving apparatus includes a receiving unit configured to receive audio data sampled in accordance with a first clock signal; a synchronization unit configured to generate a second clock signal that is synchronized with the first clock signal by extracting clock components contained in the audio data; a demodulator configured to demodulate the audio data in accordance with the second clock signal; an oversampling unit configured to oversample the audio data demodulated by the demodulator by using a frequency higher than a frequency of the second clock signal; a clock generator configured to generate a third clock signal having a frequency nearly equal to the first clock signal; and a data output unit configured to output the audio data oversampled by the oversampling unit in accordance with the third clock signal generated by the clock generator.

Claims

1. An audio data receiving apparatus comprising:

a receiving unit configured to receive audio data sampled in accordance with a first clock signal;

a synchronization unit configured to generate a second clock signal that is synchronized with the first clock signal by extracting clock components contained in the audio data;

a demodulator configured to demodulate the audio data in accordance with the second clock signal;

an oversampling unit configured to oversample the audio data demodulated by the demodulator by using a frequency which is higher than a frequency of the second clock signal and which is obtained by use of the second clock signal;

a clock generator configured to generate a third clock signal having a frequency which is equal to a frequency of the first clock signal; and

a data output unit configured to output the audio data oversampled by the oversampling unit in accordance with the third clock signal generated by the clock generator,

in which the third clock signal generated by the clock generator is asynchronous with the first clock signal such that the first clock signal is not utilized to generate the third clock signal,

wherein the oversampling unit oversamples the audio data by using a frequency obtained by multiplying the frequency of the second clock signal by n, where n is an integer between 256 and 1024, inclusive,

wherein the oversampling unit has a buffer for temporarily storing the oversampled audio data, and

wherein the data output unit reads the oversampled audio data from the buffer in accordance with the third clock signal.

2. An audio data receiving method comprising the steps of:

receiving audio data sampled in accordance with a first clock signal;

generating a second clock signal that is synchronized with the first clock signal by extracting clock components contained in the audio data;

demodulating the audio data in accordance with the second clock signal;

oversampling the demodulated audio data by using a frequency which is higher than a frequency of the second clock signal and which is obtained by use of the second clock signal;

generating a third clock signal having a frequency which is equal to a frequency of the first clock signal; and

outputting the oversampled audio data in accordance with the third clock signal,

in which the third clock signal is asynchronous with the first clock signal such that the first clock signal is not utilized to generate the third clock signal,

wherein oversampling the demodulated audio data comprises oversampling the demodulated audio data using a frequency obtained by multiplying the frequency of the second clock signal by n, where n is an integer between 256 and 1024, inclusive,

wherein oversampling the demodulated audio data comprises temporarily storing the oversampled audio data in a buffer, and

wherein outputting the oversampled audio data comprises reading the oversampled audio data from the buffer in accordance with the third clock signal.

3. An audio data transmission and receiving system comprising:

an audio data transmission apparatus including

a transmission unit configured to transmit audio data sampled in accordance with a first clock signal; and

an audio data receiving apparatus including

a receiving unit configured to receive the audio data transmitted from the audio data transmission apparatus,

a synchronization unit configured to generate a second clock signal synchronized with the first clock signal by extracting clock components contained in the audio data,

a demodulator configured to demodulate the audio data in accordance with the second clock signal,

an oversampling unit configured to oversample the audio data demodulated by the demodulator by using a frequency which is higher than a frequency of the second clock signal and which is obtained by use of the second clock signal,

a clock generator configured to generate a third clock signal having a frequency which is equal to a frequency of the first clock signal, and

a data output unit configured to output the audio data oversampled by the oversampling unit in accordance with the third clock signal generated by the clock generator,

in which the third clock signal generated by the clock generator is asynchronous with the first clock signal such that the first clock signal is not utilized to generate the third clock signal,

wherein the oversampling unit oversamples the audio data by using a frequency obtained by multiplying the frequency of the second clock signal by n, where n is an integer between 256 and 1024, inclusive,

wherein the oversampling unit has a buffer for temporarily storing the oversampled audio data, and

wherein the data output unit reads the oversampled audio data from the buffer in accordance with the third clock signal.