Sinusoidal coding

• US 20020007268A1
• Filed: 06/20/2001
• Published: 01/17/2002
• Est. Priority Date: 06/20/2000
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Oomen, Arnoldus Werner Johannes, Den Brinker, Albertus Cornelis
• Granted Patent: US 7,739,106 B2
• Time in Patent Office: Days
• US Class Current: 704/206
• CPC Class Codes: G10L 19/02 using spectral analysis, e.g. transform vocoders or subband vocoders

Abstract

Encoding (2) a signal (A) is provided, wherein frequency and amplitude information of at least one sinusoidal component in the signal (A) is determined (20), and sinusoidal parameters (f,a) representing the frequency and amplitude information are transmitted (22), and wherein further a phase jitter parameter (p) is transmitted, which represents an amount of phase jitter that should be added during restoring the sinusoidal component from the transmitted sinusoidal parameters (f,a).

Claims

1. A method of encoding (2) a signal (A), the method comprising the steps of:

determining (20) frequency and amplitude information of at least one sinusoidal component in the signal (A); and

transmitting (22) sinusoidal parameters (f,a) representing the frequency and amplitude information;

characterized in that the method (2) further comprises the step of;

transmitting (22) a phase jitter parameter (p) representing an amount of phase jitter that should be added during restoring the sinusoidal component from the transmitted sinusoidal parameters (f,a).

2. A method (2) as claimed in claim 1, wherein the phase jitter parameter (p) is transmitted (22) approximately together with the sinusoidal parameters (f,a) at a first instance of a track.

3. A method (2) as claimed in claim 1, wherein a phase jitter parameter (p) is transmitted for a given group of sinusoidal components, which sinusoidal components have harmonically related frequencies.

4. A method (2) as claimed in claim 1, the method (2) further comprising the steps of:

determining (20) a difference between a phase of the sinusoidal component and a predicted phase, which predicted phase is calculated from the transmitted sinusoidal parameters (f,a) and a phase continuation requirement; and

deriving (20) the phase jitter parameter (p) from said difference.

5. A method of decoding (4) an encoded signal (A′

), the method comprising the steps of;

receiving (40) sinusoidal parameters (f,a) representing frequency and amplitude information of at least one sinusoidal component;

restoring (41) the at least one sinusoidal component from the sinusoidal parameters (f,a);

characterized in that the method further comprises;

receiving (40) a phase jitter parameter (p);

adding (41) an amount of phase jitter to the sinusoidal component, which amount of phase jitter is derived from the phase jitter parameter.

6. An audio coder (2) comprising:

means (20) for determining frequency and amplitude information of at least one sinusoidal component in the signal (A); and

means (22) for transmitting sinusoidal parameters (f,a) representing the frequency and amplitude information;

characterized in that the audio coder (2) further comprises;

means (22) for transmitting a phase jitter parameter (p) representing an amount of phase jitter that should be added during restoring the sinusoidal component from the transmitted sinusoidal parameters (f,a).

8. An audio system comprising an audio coder (2) as claimed in claim 6 and an audio player (4) as claimed in claim 7.

7. An audio player (4) comprising:

means (40) for receiving sinusoidal parameters (f,a) representing frequency and amplitude information of at least one sinusoidal component;

means (41) for restoring the at least one sinusoidal component from the sinusoidal parameters (f,a);

characterized in that the audio player further comprises;

means (40) for receiving a phase jitter parameter (p);

means (41) for adding an amount of phase jitter to the sinusoidal component, which amount of phase jitter is derived from the phase jitter parameter.

9. An encoded signal (A′

) comprising sinusoidal parameters (f,a) representing frequency and amplitude information of at least one sinusoidal component and further comprising a phase jitter parameter (p) representing an amount of phase jitter that should be added during restoring the sinusoidal component from the sinusoidal parameters (f,a).

10. A storage medium (3) on which an encoded signal (A′

) as claimed in claim 9 is stored.