IBOC broadcasting receiver

1. An IBOC broadcasting receiver that uses two different bit error rates as threshold values in receiving hybrid broadcasting in a simultaneous broadcasting format and switches between digital broadcasting reception and analog broadcasting reception based on the two threshold values; the IBOC broadcasting receiver comprising:

a counter unit that counts the number of occurrences of switching between digital broadcasting reception and analog broadcasting reception in a specified period of time; and

a control device that changes a hysteresis width between the two threshold values when the number counted by the counter unit reaches a specified number,

wherein the counter unit counts the number of occurrences of switching between digital broadcasting reception and analog broadcasting reception in a specified period of time by using another set of threshold values obtained as a result of the increased hysteresis width, and the control device changes the hysteresis width between the another set of threshold values when the number counted by the counter unit reaches a specified number.

2. An IBOC broadcasting receiver according to claim 1 , wherein the control device reduces the hysteresis width between the another set of threshold values when the number counted by the counter unit is less than the specified number.

3. An IBOC broadcasting receiver that receives hybrid broadcasting in a simultaneous broadcasting format, the IBOC broadcasting receiver comprising:

a memory device that stores a set of different bit error rates as threshold values;

a switching device that switches between digital broadcasting reception and analog broadcasting reception based on the threshold values;

a counter unit that counts the number of occurrences of switching between digital broadcasting reception and analog broadcasting reception in a specified period of time; and

a control device that changes the threshold values stored in the memory device when the number counted by the counter unit reaches a specified number,

wherein the counter unit counts the number of occurrences of switching between digital broadcasting reception and analog broadcasting reception in a specified period of time by using the threshold values changed by the control device, and the control device changes the threshold values stored in the memory device when the number counted by the counter unit reaches a specified number.

4. An IBOC broadcasting receiver according to claim 3 , wherein the control device changes the threshold values to change a hysteresis width between the threshold values.

5. An IBOC broadcasting receiver according to claim 4 , wherein the hysteresis width between the threshold values is reduced.

6. An IBOC broadcasting receiver according to claim 3 , wherein the control device changes the threshold values by increasing one of the threshold values and decreasing another of the threshold values to change a hysteresis width between the threshold values.

7. An IBOC broadcasting receiver according to claim 6 , wherein the hysteresis width between the threshold values is decreased.

8. An IBOC broadcasting receiver that receives hybrid broadcasting in a simultaneous broadcasting format, the IBOC broadcasting receiver comprising:

a switching device that switches between digital broadcasting reception and analog broadcasting reception based on a set of predetermined different bit error rates separated by a first hysteresis width;

a counter unit that counts the number of occurrences of switching between digital broadcasting reception and analog broadcasting reception in a specified period of time; and

a control device that changes the first hysteresis width to a second hysteresis width when the number counted by the counter unit exceeds a specified number,

wherein the counter unit counts the number of occurrences of switching between digital broadcasting reception and analog broadcasting reception in a specified period of time by using the threshold values separated by the second hysteresis width, and the control device changes the second hysteresis width to the first hysteresis width when the number counted by the counter unit becomes less than the specified number.

9. An IBOC broadcasting receiver that receives hybrid broadcasting in a simultaneous broadcasting format, the IBOC broadcasting receiver comprising:

a switching device that switches between digital broadcasting reception and analog broadcasting reception based on a set of predetermined different bit error rates separated by a first hysteresis width;

a counter unit that counts the number of occurrences of switching between digital broadcasting reception and analog broadcasting reception in a specified period of time; and

a control device that changes the first hysteresis width to a second hysteresis width when the number counted by the counter unit exceeds a specified number, wherein

the second hysteresis width is greater than the first hysteresis width, and

the set of predetermined different bit error rates includes a first bit error rate and a second bit error rate greater than the first bit error rate, and the control device changes the first hysteresis width to the second hysteresis width by changing the first bit error rate to a third bit error rate smaller than the first bit error rate, and the second bit error rate to a fourth bit error rate greater than the second bit error rate.