Up-sampling television audio signals for encoding

1. A television audio signal encoder for producing encoded television audio signals, comprising:

a matrix configured to sum a left channel digital audio signal and a right channel digital audio signal to produce a sum signal, and to subtract one of the left and right audio signals from the other to produce a difference signal;

a first up-sampler configured to insert additional samples into the sum signal to increase the sample rate of the sum signal; and

a second up-sampler configured to insert additional samples into the difference signal to increase the sample rate of the difference signal;

wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

2. The television audio signal encoder of claim 1 , further comprising:

a digital filter configured to receive the up-sampled sum signal, wherein the increased sample rate is selected based on characteristics of the digital filter.

3. The television audio signal encoder of claim 1 , further comprising:

a compressor configured to receive the up-sampled difference signal, wherein the increased sample rate is selected based on characteristics of the compressor.

4. The television audio signal encoder of claim 1 , wherein the television audio signals comply to the A2/Zweiton standard.

5. The television audio signal encoder of claim 1 , wherein the television audio signals comply to the EIA-J standard.

6. A television audio signal encoder, comprising:

a first up-sampler configured to insert additional samples into a difference signal to increase the sample rate of the difference signal, wherein the difference signal represents the subtraction of one of a left channel digital audio signal and a right channel digital audio signal;

a second up-sampler configured to insert additional samples into a sum signal to increase the sample rate of the sum signal, wherein the sum signal represents the sum of the left channel digital audio signal and the right channel digital audio signal; and

a compressor configured to receive the up-sampled difference signal, wherein the increased sample rate is selected based on characteristics of the compressor;

wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

7. A television audio signal encoder, comprising:

a first up-sampler configured to insert additional samples into a secondary audio program signal to increase the sample rate of the secondary audio program signal; and

a second up-sampler configured to insert additional samples in a compressed version of the secondary audio program signal to increase the sample rate of the compressed secondary audio program signal;

wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

8. A television audio signal encoder, comprising:

a summer configured to sum a signal associated with the sum of a left channel digital audio signal and a right channel digital audio signal and a signal associated with the difference between the left and right digital audio signals; and

a first up-sampler configured to insert additional samples into an output signal of the summer to increase the sample rate of the output signal; and

wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

9. The television audio signal encoder of claim 8 , wherein the signal associated with the difference between the left and right digital audio signals is amplitude modulated.

10. A television audio signal encoder, comprising:

a summer configured to sum,

a sum signal associated with the sum of a left channel digital audio signal and a right channel digital audio signal and associated with the difference between the left and right digital audio signals, and

a difference signal associated with a secondary audio program channel;

a first up-sampler configured to insert additional samples into the sum signal or the difference signal; and

a second up-sampler configured to insert additional samples into an output signal of the summer to increase the sample rate associated with the output signal;

wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

11. The television audio signal encoder of claim 10 , wherein the signal associated with the secondary audio program channel is frequency modulated.

12. The television audio signal encoder of claim 10 , further comprising:

a frequency modulator configured to modulate a signal associated with the output of the first up-sampler.

13. The television audio signal encoder of claim 10 , wherein the up-sampled output signal of the summer is provided to a transmitter.

14. The television audio signal encoder of claim 10 , further comprising:

a frequency modulator configured to modulate the output signal of the second up-sampler.

15. A computer program product residing on a computer readable storage having a plurality of instructions stored thereon which, when executed by the processor, cause that processor to:

insert additional samples into a sum signal to increase the sample rate of the sum signal, wherein the sum signal represents the sum of a television left channel digital audio signal and a television right channel digital audio signal; and

insert additional samples into a difference signal to increase the sample rate of the difference signal, wherein the difference signal represents the subtraction of one of a television left channel digital audio signal and a television right channel digital audio signal from the other of the left and right digital audio signals;

wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

16. The computer program product of claim 15 , further comprising instructions to:

insert additional samples into a signal associated with a secondary audio program channel to increase the sample rate of the secondary audio program signal.

17. The computer program product of claim 15 , further comprising instructions to:

insert additional samples into an output signal of a summer, wherein the summer configured to sum the sum signal and difference signal, and

a signal associated with the secondary audio program channel.

18. A computer program product residing on a computer readable storage medium having a plurality of instructions stored thereon which, when executed by the processor, cause that processor to:

insert additional samples into a sum signal to increase the sample rate of the sum signal, wherein the sum signal represents the sum of a television left channel digital audio signal and a television right channel digital audio signal; and

insert additional samples into a difference signal to increase the sample rate of the difference signal, wherein the difference signal represents the subtraction of one of the television left channel digital audio signal and the television right channel digital audio signal from the other of the left and right digital audio signals;

wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

19. The computer program product of claim 18 , further comprising instructions to:

insert additional samples into a signal associated with a secondary audio program channel to increase the sample rate of the secondary audio program signal.

20. A method of encoding television audio signals, comprising:

with a first up-sampler, inserting additional samples into a sum signal to increase the sample rate of the sum signal, wherein the sum signal represents the sum of a left channel digital audio signal and a right channel digital audio signal;

with a second up-sampler, inserting additional samples into a difference signal to increase the sample rate of the difference signal, wherein the difference signal represents the subtraction one of a left channel digital audio signal and a right channel digital audio signal from the other of the left and right digital audio signals; wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard; and

inserting additional samples into a signal associated with a secondary audio program channel to increase the sample rate of the secondary audio program signal.

21. The method of claim 20 , further comprising:

inserting additional samples into an output signal of a summer, wherein the summer is configured to sum,

the sum signal and the difference signal, and

the signal associated with the secondary audio program channel.

22. A method of encoding television audio signals, comprising:

inserting additional samples into a sum signal to increase the sample rate of the sum signal, wherein the sum signal represents the sum of a left channel digital audio signal and a right channel digital audio signal; and

inserting additional samples into a difference signal to increase the sample rate of the difference signal, wherein the difference signal represents the subtraction one of the left channel digital audio signal and the right channel digital audio signal from the other of the left and right digital audio signals; wherein the television audio signals comply to the Broadcast Television System Committee (BTSC) standard.

23. A method of claim 22 , further comprising:

inserting additional samples into a signal associated with a secondary audio program channel to increase the sample rate of the secondary audio program signal.